Title of Invention	LOW SPEED DISCOIDAL ELECTRIC MOTOR
Abstract	The present invention relates to a light, low-speed multipole discoidal electric motor. In particular, the present invention relates to a light, low-speed multipole discoidal electric motor which can be configured, for example, for driving collapsible wheel chairs for physically handicapped people.

Full Text

FORM 2 THE PATENTS ACT 1970 (39 Of 1970) & The Patent Rules, 2003 COMPLETE PROVISIONAL SPECIFICATION (See section 10 and rule 13) Low Speed Discoidal Electric Motor Mr. Konfrst, Vaclav Czech National Mostecka 3184, CZ-272 01 Klando, Czech Republic, Europe The following specification particularly describes the invention and the manner in which it is to be performed. LOW SPEED DISCOIDAL ELECTRIC MOTOR FIELD OF THE INVENTION The present invention relates to a light, low-speed multipole discoidal electric motor. In particular, the present invention relates to a light, low-speed multipole discoidal electric motor which can be configured, for example, for driving collapsible wheel chairs for physically handicapped people. BACKGROUND OF THE INVENTION Low-speed driving units utilizing an electric motor drive are well known in the prior art. The torque of such low-speed driving units, measured on the outlet shaft at rated speed, lies within the range of units per second as being of an order l00Nm and has been characterized by a design feature based on a standard highspeed electric drive equipped with a gearbox. However, this part of the wheel proves to have the highest failure mode. The operation of an advanced driving mechanism requires the development of a contactless electric motor without a gearbox to be maintenance free for the whole lifetime. In Czech patent application 1480-97 A3 to Nicolas Wavre of Neuchatel, CH, Wavre applies lightening of a synchronous motor with permanent magnets and by fitting coils into addendum top land, where the coils are slid on the teeth with the axes oriented to the centre of the motor, which are connected by means of a magnetic yoke. However, in Wavre's disclosure, it is not possible to attain necessary weight and performance parameters. Czech patent CZ 279 581 B6, registrant the Institute of Thermo-technology of Academy of Sciences of the Czech Republic (0stav termotechniky AVER), Prague, CZ discloses a machine with a diameter greater than one meter by applying a principle of two rotors, one of them being equipped with magnets whereas the other has pairs of pole shoes with coils slid on. This device can be used for the purpose of a light motor with a large diameter. However, it is obvious that although this arrangement cannot be used as a drive due to uncompensated 2 flip-flop effect resulting in generating vibrations. Czech patent CZ 291897 B6 dated 2001 discloses that conventional motors with gearboxes can be replaced by motors without gearboxes on the basis of FeNdB magnets placed on the rotor and with stator coils wound on a continuous circular ring made from soft magnetic material, e.g. ferrite where starting torque may be increased by increasing radius of the position of the electric motor functional elements. This engineering design solution is technologically limited to diameters up to 300mm. Because of the technological limitations regarding the manufacture of the ring made from soft magnetic material, this solution cannot be applied to the manufacture of the motors with the light design engineering features without a gearbox whose diameter exceeds 500mm, with the width being a few centimeters and with the starting torque being of an order l00Nm, with ratio of motor diameter to the motor thickness greater than 15. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an advanced driving mechanism having a contactless electric motor without a gearbox. It also is an object of the present invention to provide an advanced driving mechanism which is maintenance free for the whole lifetime. It is another object of the present invention to provide a low-speed discoidal electric motor. Additional objects, advantages and novel features of the invention will be set forth in part of the description which follows, and in part will become apparent to those skilled in the art upon examination of the following specification or maybe learned by practice of the invention. 3 These and other objects are achieved by providing a low-speed discoidal electric motor with permanent magnets that are fitted on the rotor and with the coils located on the stator. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be better understood with reference to the appended drawing sheets, wherein: Figure 1 is an elevated side cross-sectional view of the low speed discoidal electric motor of the present invention, the cross section passing through the axis of the electric motor. Figure 2 depicts the origin of the parasite forces FFe with their resultant (17) and their elimination and the engineering design of the segments of the low-speed discoidal electric motor of the present invention. Figure 3 depicts the characteristic of the magnetic field of the permanent magnets that are in coincidence with magnetic field H of the coils of the low-speed discoidal electric motor of the present invention. LIST OF REFERENCE NUMERALS: Reference Numeral Name of parts/force 1 Carrier 2 Permanent Magnets 3 Segments 4 Stator Coils 5 Position Indicators 6 Lead-in wires 7 Wheel Rim 8 Spokes 9 Shanks 10 Rotor Disks 11 Stator Disks 12 Bearing Bushings 4 13 Ball Bearings 14 Fixing Hub 15 Poles 16 Magnetic Field 17 Resultant Parasite Force 18 Parasite Forces 19 Active Force F DETAILED DESCRIPTION: Referring now to the Figures 1 and 2, the aforementioned shortcomings and insufficiencies are removed to considerable extent in the present invention by providing a low-speed discoidal electric motor with permanent magnets (2) that are fitted on the rotor and with the coils (4) located on the stator. The stator coils (4), making up the poles (15) of the motor, are positioned on large diameter segments (3) that have the form of an arc of a circle made from soft magnetic material that is simply and cheaply producible. Discrete elements in the classical motor with permanent magnets (2) possessing high level of magnetic remanence, with magnetic permeance unless they meet relations of coincidence of spatial dimensional arrangement that is the subject matter of this invention, generate flip-flop effects. In this invention, the flip-flop effect from the transition skips of the magnets (2) in accordance with the spatial density of the magnetic flux generated by a shape of permanent magnets (2) of the rotor and geometrical arrangement of the segments (3) with magnetic permeance together with the resultant of the sum of magnetic field intensity H of the coils (4) on the poles (15) of the segments (3) in every position of the rotor relative to the stator is eliminated. The substance of the invention consists in a comprehensive engineering design arrangement of the active parts of the rotor, i.e. the rotor permanent magnets (2), the segments (3) made from soft magnetic material of the stator with magnetic permeance and the dimension and positioning of the coils (4) of the stator that make up the poles (15) of the motor and ensures that they are neutral 5 relative to permanent magnet (2) in terms of force and magnetic field, that is they do not generate vibrations. In order to provide smooth motor running and to eliminate the generation of the vibrations the dimensions of segments (3) - the segments (3) forming parts of the ring in coincidence with dimensional arrangement of the permanent magnets (2) of the rotor together with dimensional arrangement of the coils (4) of the stator must satisfy simultaneously all the following relations of the geometric spatial arrangement: 1) Number of the permanent magnets (2) of the rotor must be even number. 2) Outer cylindrical surface of the segments (3) of the stator made from soft magnetic material has identical distance from the surface of every permanent magnet (2) in every position of the rotor relative the stator. The poles (15) of the electric motor are made up by the coils (4) of the stator in the air gap. 3) The number of segments (3) of the stator made from soft magnetic material must not be commensurable with the number of permanent magnets (2) of the rotor that moreover has a characteristic defined as follows: the nearest higher as well as the nearest lower numbers of segment (3) are also not commensurable with the number of permanent magnets (2) of the rotor and the second nearest higher as well as the second nearest lower numbers must be commensurable with the number of permanent magnets (2) of the rotor. The commensurabilty is vice versa. 4) The number and positioning of the coils (4) on the segment (3) that make up the poles (15) of the electric motor must satisfy the following relations: i. The number of the coils (4) on the segment (3) = 2 x the number of phases of the motor x N (N = integer). ii. Every phase of the motor must be represented on the segment (3) by equal 6 number of the coils (4) - number of poles (15) of the motor phase. iii. The number of permanent magnets (2) of the rotor must be commensurable by the number of coils (4) on the segment of the stator made from soft magnetic material. iv. The position of the coils (4) on the segment (3) must meet a condition for angular distribution on the stator irrespective of the dimensions and the distribution of the stator segments (3) made from soft magnetic material. Angle of coil fitting for ith phase = (360 / number of rotor permanent magnets) x (coil order + (i - 1) / nmotor phases) where i is integer in the interval 1 up to nmotor phases and nmotor phases is the number of motor phases. For instance - for the number of permanent magnets (2) 48 the following data meet the relations of spatial distribution for the elimination of parasite force impact that would cause vibrations: a. 10 segments (3) made from soft magnetic material. b. 12 coils (4) on every segment for three-phase low-speed motor, or 24 coils (4) for six-phase low-speed motor. This invention is made clearer by using figures illustrating the following: Figure 1 illustrates a part of the electric motor shown in side elevation cross section passing through the axis of the electric motor. Figure 2 clarifies the origin of the parasite forces FFe with their resultant (17) that are generated by permanent magnets (2) and the engineering design of the segments (3) made from soft magnetic material and the substance of their elimination how it has been described in the above-identified items 1, 2 and 3. Figure 3 characterizes the magnetic field (16) of permanent magnets (2) that in coincidence with magnetic field H of the coils (4) induces an active force F (19) on the circumference of the motor and contemporaneously illustrates the 7 substance of the origin of the parasite forces due to action of the sum of magnetic intensity SH of the individual coils (4) - poles (15) of the electric motor inside of the stator segment (3) so that in case of not fulfilling the condition SH = 0 induces on the poles (15) of the segments (3) parasite forces (18) in coincidence with magnetic field (16) of the permanent magnet of the rotor whose conditions necessary for elimination are presented in the above-identified item 4. Example of the invention: The low-speed discoidal electric motor (Figure 1) is made up of a stator and a rotor. Load bearing structure of the rotor is designed from two rotor disks (10) made from light flexible material, e.g. (duraluminium). Both rotor disks (10) are on the outer circumference, mechanically linked by means of wheel rim (7). The wheel rim (7) is intended for the creation of box-type structure of rotor sandwich arrangement. The wheel rim (7) serves in case of wheel chairs drive for physically handicapped people for tire mounting. To the inner cylindrical part of the wheel rim (7) is connected a permanent magnets (2) carrier (1) made from magnetic conducting material. The permanent magnets (2) carrier (1) is of annular ring shape. On the inner circular surface of carrier (1) there are permanent magnets (2) with high level of residual induction (2) attached. The rotor is mechanically linked to the stator by means of ball bearings (13). The ball bearings (13) are supported by bearing bushings (12). The bearing bushings (12) are mechanically linked to the rotor disks (10). The ball bearings (13) are pressed on a fixing hub (14) that is a part of the stator. To the aforementioned fixing hub (14) is attached a stator disk (11). The stator disk (11) in light sandwich design is made up of two pieces. On the circumference of the stator disk (11) there are spokes (8) mounted intended for fixing segments (3) as shown in Figure 1. The spokes (8) for fixing segments (3) 8 are made from non-magnetic material. The segments (3) themselves made from soft magnetic material are set into the grooves of the spokes (8) made on the circumferential surface. The lower medium part of the spoke (8) is followed by a shank (9). By means of the shank (9) the spokes (8) for the fixing of the segments (3) are attached to the stator disk (11). The segment (3) of the magnetic shield is made from soft magnetic material, that is transformer sheets. On the segment (3) of the magnetic shield are attached the coils (4). The active parts of the coils (4) are in the air gap. The air gap is defined by the end-face of the permanent magnet (2) and the outer surface of the segment (3) of the magnetic shield. It means that the active parts of the coils (4) are in the space through which magnetic flux of the permanent magnets (2) flows. The air gap is invariably the same in any position of rotor with regard to the stator. The poles (15) of the stator are made up of the active parts of the coils (4) in the air gap. The number of the coils (4) underneath one permanent magnet (2) makes up the number of the phases of the motor. Relative position of every coil (4) with respect to permanent magnet (2) is monitored by position indicator (5). The coils (4) are fed with electric current lead-in wires (6) passing through hollow space of the fixing hub (14). Mechanical configuration of the active parts of the electric motor, i.e. the carriers (1) of the permanent magnets (2), the segment (3) of the magnetic shield including engineering design of the fixing into the spokes (8) the positioning of the coils (4) on the segment (3) of the magnetic shield and the principle of assurance of the magnetic neutrality of a segment at the moment of connecting the coils to the voltage is illustrated in detail in the Figures 2 and 3. DESCRIPTION OF THE MOTOR FUNCTION: The permanent magnets (2) located along the whole inner cylindrical surface of the carrier (1) are the source of magnetic flux. The carrier (1) closes the magnetic circuit of the permanent magnets (2). On the inner side the magnetic flux enters 9 into the air gap defined by internal cylindrical surface of the permanent magnets (2) and external cylindrical surface of the annular ring made up of segments (3) of the magnetic shield. The major part of the magnetic flux (16) (Figure 3) generates in the air gap a magnetic induction and closes through the segment (3) of the magnetic shield. The leakage part of the magnetic flux closes in the space on the inner side of the segment (3) of the magnetic shield and on the outer side of the carrier (1) of the permanent magnets (2). After connecting input power supply voltage to feeding wire (6) an electric current begins to flow through the coils (4) (see Figure 3) wherein the electric current flowing in one direction is indicated by the character X, whereas the electric current flowing in the opposite direction indicated by the character *). The magnetic flux (16) in the air gap generates, in coincidence with the magnitude and direction of the electric current flowing through that part of the winding of the coils (4) that are in the air gap, the required tangential active force F (19). The previously mentioned force F is that force being transferred through the wheel rim (7) to the circumference of the wheel of the wheel chair. The engineering design of the motor according to the paragraph "Examples of the implementation of the invention" consisting in a split stator divided into segments (3) made from the soft magnetic material generates in the point of setting in the spoke (8) a non-homogeneous magnetic field (16) producing radial forces FFe with the resultant (17) of variable magnitude according to relative position of the stator and the rotor. The course of force depends on relative position of the magnet and the axis of the spoke with the segments (3) set in the grooves. Provided that an angle of the spoke axis (8), calculated as the angle between the line joining the centre of the wheel to centre of gap of permanent magnets (2) and the axis of the spoke is a variable quantity and within the range from the beginning to the end of the magnet the force (17) reaches positive values as far as the centre of the magnet 10 and negative values from the centre as long as the end of the magnet length irrespective of the magnet polarity. By fulfilling the following conditions: 1. The number of the permanent magnets (2) of the rotor must be even number. 2. The number of the stator segments (3) made from soft magnetic material (3) must be non-commensurable number / coprime number under conditions according to the above-identified item 3. Compensation of the resultant force (17) occurs due to uniform distribution of spoke axes relative to the distribution of the permanent magnets (2) of the rotor -thanks to the method whose principle is illustrated in Figure 2. The condition of the magnetic neutrality of the poles (15) of the segments (3) must be fulfilled simultaneously, it implies that the resultant intensity of the magnetic field H of the individual coils (4) of every segment (3) must meet the condition SH = 0 so that the poles (15) of the segment made from soft magnetic material in the point of setting in the spoke (8) are neutral from magnetic point of view and parasite forces (18) do not arise due to coincidence of the magnetic flux (16) of the permanent magnets (2) and the magnetic flux of the segment (3). Individual coils (4) that make up the poles (15) of the motor and are connected to the phase of the motor winding according to the item 4 of the paragraph "The substance of the invention" are switched to energize them in dependence of the position of the rotor relative to the stator so that the tangential force F(19) on the circumference of the motor may be produced. Provided that the motor construction satisfies the relations according to item 4 of the paragraph "The substance of the invention" an even number of coils (4) of the same phase of the motor is always energized on every segment (3) which assures that the sum of 11 particular components of the magnetic intensity H in every point of relative position of the rotor and stator meets the condition of magnetic neutrality SH = 0 and no parasite forces (18) between the poles(15) of the stator segments (3) and the permanent magnets (2) of the rotor occur and the motor even at low speed and high level of starting torques runs smoothly. Example of industrial application: The invention can be utilized providing that it works as an advanced low-speed driving mechanism to drive light portable collapsible wheel chairs for physically handicapped people or if it works as a low-speed generator intended for the production of electricity. In view of the above discussion, it will be appreciated by any person skilled in the art that the present invention of low speed diskoidal electric motor for avoiding flip-flop effect and vibrations basically comprises: (a) a rotor, and (b) a stator wherein said rotor comprises: a pair of rotor disks (10), a wheel rim (7), a carrier (1), plurality of permanent magnets (2), plurality of bearing bushings (12), plurality of ball bearings (13), wherein said pair of rotor disks (10) is mechanically connected at near circumference part thereof to said wheel rim (7) and at side surface of near-centre part thereof to said plurality of bearing bushings (13), said wheel rim (7) being mechanically connected at the inner surface thereof to outer surface of said carrier (1), wherein said carrier (1) is mechanically connected at the annular undersurface thereof to outer surface of said plurality of permanent magnets (2); 12 wherein said plurality of bearing bushings (12) are pushingly disposed on and rotatably connected to said plurality of bearings (13); and wherein said stator comprises: a pair of stator disks (11), a fixing hub (14), plurality of shanks (9), plurality of spokes (8), plurality of segments (3), plurality of stator coils (4), plurality of lead-in wires (6), plurality of position indicators, wherein said pair of stator disks (11) is mechanically connected at side surface of near-centre part thereof to side surface of radially projecting part of said fixing hub (14) and mechanically and fixed connected at side surface of near-circumference part thereof to said plurality of shanks (9), said plurality of shanks (9) being mechanically connected at the outer surface thereof to said plurality of spokes (8); wherein said plurality of position indicators (5) are mechanically connected to said plurality of shanks (9); wherein said plurality of segments (3) with longitudinal axes thereof forming arcs of circle, all said arcs having same radius, are stably set into corresponding grooves of said plurality of spokes (8) such that an air-gap of uniform size is maintained between inner surfaces of said plurality of permanent magnets (2) and corresponding outer surfaces of said plurality of segments (3) in any position of said stator relative to said rotor; wherein each coil of said plurality of stator coils (4) is appropriately wound and mounted on respective segment of said plurality of segments (3); 13 wherein said plurality of bearings (13) are sandwichingly disposed between said plurality of bearing bushings (12) and said fixing hub (14); and wherein each coil of said plurality of stator coils (4) is fed with electric current with respective wire of said plurality of lead-in wires (6); and wherein each segment of said plurality of segments (3) is made of soft magnetic material; wherein each spoke of said pair of rotor disks (10) is made of light flexible material; wherein said carrier (1) is made of magnetic conducting material and is of annular ring shape; wherein each spoke of said plurality of spokes (8) is made of non-magnetic material; wherein said plurality of stator coils (4) make up poles (15) of said motor; and wherein first means for compensating and eliminating the parasite forces FFe with their resultant parasite forces (17) produced by coincidence of magnetic effects of said permanent magnets (2) and said segments (3), are formed by combination arrangement of said permanent magnets (2) and said segments (3) of claim 1, wherein (i) number of said permanent magnets (2) is an even number; (ii) number of said segments (3) of said stator is not commensurable with the number of said permanent magnets (2) of said rotor; (iii) the nearest higher number as well as the nearest lower number of said segments (3) of said stator are not commensurable with the number of said permanent magnets (2) of said rotor; (iv) the second nearest higher number as well as the second lower number of said segments (3) of said stator are commensurable with the number of permanent magnets (2) of said rotor; and 14 (v) Commensurability is measured in either above mentioned manner or vice versa manner; and wherein second means for compensating and eliminating parasite forces (18) which arise due to coincidence of magnetic flux of magnetic field (16) of said permanent magnets (2) and magnetic flux of said segments (3), are formed by combination arrangement of said permanent magnets (2), said segments (3), said stator coils (4), and phase of said motor, wherein (c) number of said coils (4) on respective segments (3) = 2 x the number of said phases of said motor x N, wherein n is an integer; (d) each said phase of said motor is represented on respective segment (3) by equal number of said coils (4) which coils (4) form poles (15) of said electric motor; (e) the number of said coils (4) on a segment (3) is commensurable by number of said permanent magnets (2) of said rotor; (f) position of any of said coils (4) on any of said segments (3) meets a condition for angular distribution on said stator irrespective of the dimensions and distribution of said segments (3), said condition being such that angle of coil fitting for the ith phase = (360/number of permanent magnets) x (coil order + (i-l)/nmotorphase), wherein i is an integer in the interval from 1 to up to nmotorphase, and nmotorphase = the number of motor phases, and (g) commensurability in item (e) above is measured in either above mentioned manner or vice versa manner; and 15 (h) wherein the construction of said motor and connections of said lead-in wires (6) to said coils (4) is made such that as effect of (f) above, even number of said coils (4) of the same phase are always energized on every said segment (3). While particular embodiments of the invention have been described, it will be understood, of course, that the invention is not limited thereto, and that many obvious modifications and variations can be made, and that such modifications and variations are intended to fall within the scope of the appended claims. 16 We Claim: 1. A low speed diskoidal electric motor for avoiding flip-flop effect and vibrations, comprising: (a) a rotor, and (b) a stator wherein said rotor comprises: a pair of rotor disks (10), a wheel rim (7), a carrier (1), plurality of permanent magnets (2), plurality of bearing bushings (12), plurality of ball bearings (13), wherein said pair of rotor disks (10) is mechanically connected at near circumference part thereof to said wheel rim (7) and at side surface of near-centre part thereof to said plurality of bearing bushings (13), said wheel rim (7) being mechanically connected at the inner surface thereof to outer surface of said carrier (1), wherein said carrier (1) is mechanically connected at the annular undersurface thereof to outer surface of said plurality of permanent magnets (2); wherein said plurality of bearing bushings (12) are pushingly disposed on and rotatably connected to said plurality of bearings (13); and wherein said stator comprises: a pair of stator disks (11), a fixing hub (14), plurality of shanks (9), plurality of spokes (8), plurality of segments (3), plurality of stator coils (4), plurality of lead-in wires (6), plurality of position indicators, wherein said pair of stator disks (11) is mechanically connected at side surface of near-centre part thereof to side surface of radially projecting part of said fixing hub (14) and mechanically and fixed connected at 17 side surface of near-circumference part thereof to said plurality of shanks (9), said plurality of shanks (9) being mechanically connected at the outer surface thereof to said plurality of spokes (8); wherein said plurality of position indicators (5) are mechanically connected to said plurality of shanks (9); wherein said plurality of segments (3) with longitudinal axes thereof forming arcs of circle, all said arcs having same radius, are stably set into corresponding grooves of said plurality of spokes (8) such that an air-gap of uniform size is maintained between inner surfaces of said plurality of permanent magnets (2) and corresponding outer surfaces of said plurality of segments (3) in any position of said stator relative to said rotor; wherein each coil of said plurality of stator coils (4) is appropriately wound and mounted on respective segment of said plurality of segments (3); wherein said plurality of bearings (13) are sandwichingly disposed between said plurality of bearing bushings (12) and said fixing hub (14); and wherein each coil of said plurality of stator coils (4) is fed with electric current with respective wire of said plurality of lead-in wires (6). 2. The low speed discoidal electric motor as claimed in claim 1, wherein each segment of said plurality of segments (3) is made of soft magnetic material; wherein each spoke of said pair of rotor disks (10) is made of light flexible material; wherein said carrier (1) is made of magnetic conducting material and is of annular ring shape; wherein each spoke of said plurality of spokes (8) is made of non-magnetic material; wherein said plurality of stator coils (4) make up poles (15) of said motor. 18 3. The low speed discoidal electric motor as claimed in claims 1 and 2 wherein first means for compensating and eliminating the parasite forces FFe with their resultant parasite forces (17) produced by coincidence of magnetic effects of said permanent magnets (2) and said segments (3), are formed by combination arrangement of said permanent magnets (2) and said segments (3) of claim 1, wherein (i) number of said permanent magnets (2) is an even number; (ii) number of said segments (3) of said stator is not commensurable with the number of said permanent magnets (2) of said rotor; (iii) the nearest higher number as well as the nearest lower number of said segments (3) of said stator are not commensurable with the number of said permanent magnets (2) of said rotor; (iv) the second nearest higher number as well as the second lower number of said segments (3) of said stator are commensurable with the number of permanent magnets (2) of said rotor; and (v) commensurability is measured in either above mentioned manner or vice versa manner. 4. The low speed discoidal electric motor, as claimed in claims 1 to 3, wherein second means for compensating and eliminating parasite forces (18) which arise due to coincidence of magnetic flux of magnetic field (16) of said permanent magnets (2) and magnetic flux of said segments (3), are formed by combination arrangement of said permanent magnets (2), said segments (3), said stator coils (4), and phase of said motor, wherein (i) number of said coils (4) on respective segments (3) = 2 x the number of said phases of said motor x N, wherein n is an integer; 19 (ii) each said phase of said motor is represented on respective segment (3) by equal number of said coils (4) which coils (4) form poles (15) of said electric motor; (iii) the number of said coils (4) on a segment (3) is commensurable by number of said permanent magnets (2) of said rotor; (iv) position of any of said coils (4) on any of said segments (3) meets a condition for angular distribution on said stator irrespective of the dimensions and distribution of said segments (3), said condition being such that angle of coil fitting for the ith phase = (360/number of permanent magnets) x (coil order + (i-l)/nmotorphase), wherein i is an integer in the interval from 1 to up to nmotorphase, and nmotorphase= the number of motor phases, and (v) commensurability in item (iii) above is measured in either above mentioned manner or vice versa manner; and (vi) wherein the construction of said motor and connections of said lead-in wires (6) to said coils (4) is made such that as effect of (iv) above, even number of said coils (4) of the same phase are always energized on every said segment (3). 5. A low speed diskoidal electric motor substantially herein described with reference to the accompanying drawings. (Sharatchandra Dattatraya Tase) Patent Agent for the Applicant Registration Number IN/PA 879 Dated this 16th Day of June 2005 To, The Controller of Patents Patents Office Branch at Mumbai, Lower Parel, Mumbai 400 013 20 ABSTRACT Low Speed Discoidal Electric Motor A low-speed electric motor of lightweight construction with rotor diameter greater than 500mm, its width of a few cm, without a gearbox, with starting torque being of an order l00Nm, it makes use of the principle of Coulomb forces. The dimensional arrangement of both the rotor and stator even at high level of torques eliminates flip - flop effect, which is typical for conventional step motors. Rotor consists of rotor disks (10) with a wheel rim (7). The carrier (1) of the permanent magnets (2) is attached to the wheel rim (7). The rotor is linked with fixing hub (14) by means of ball bearings (13) whose bearing bushings (12) are mounted with the rotor disks (10). The stator disk (11) is attached to the fixing hub (14). The segment (3) in the shape of an arc of a circle made from soft magnetic material, which the coils are slid on, is accommodated in the spokes (8) fixed by the shank (9) to the stator disk (11). Relative position of every coil (4) relative to the permanent magnet (2) is monitored by the position indicator (5). The stator segments (3), which the coils (4) are placed on, making up the poles (15) of the motor, are compensated and they are neutral from the point of view of forces Fpe with the resultants of these forces (17), that are created by a coincidence of the permanent magnets (2) of the rotor and the segment (3) of the stator made from soft magnetic material and simultaneously compensated by zero resultant intensity of the magnetic flux SH = 0 on the poles (15) of the segments (3) relative to the permanent magnets (2) of the rotor in all motor control modes for the reason of gradual connecting the stator coils (4) to the voltage and thanks to it no parasite forces (18) are produced bringing about the flip-flop effect and vibrations because the design engineering arrangement satisfies simultaneously the following interrelations: 1. The number and design engineering arrangement of the permanent magnets (2) of the rotor; 2. The number and design engineering arrangement of the stator segments (3) made from soft magnetic material; 3. The number of the motor phases, and 4. The number and position of stator coils (4) that make up the poles (15) of the motor installed on every segment (3) depending on the number of motor phases.

Documents:

709-MUM-2005-ABSTRACT 20-6-2008.pdf

709-mum-2005-abstract(20-06-2008).doc

709-mum-2005-abstract(20-06-2008).pdf

709-mum-2005-abstract.doc

709-mum-2005-abstract.pdf

709-MUM-2005-CANCELLED 20-6-2008.pdf

709-mum-2005-cancelled pages(20-06-2008).pdf

709-MUM-2005-CLAIMS 20-6-2008.pdf

709-mum-2005-claims(granted)-(20-06-2008).doc

709-mum-2005-claims(granted)-(20-06-2008).pdf

709-mum-2005-claims.doc

709-mum-2005-claims.pdf

709-MUM-2005-CORRESPONDENCE 20-6-2008.pdf

709-mum-2005-correspondence(20-06-2008).pdf

709-MUM-2005-CORRESPONDENCE(22-7-2008).pdf

709-mum-2005-correspondence(ipo)-(19-08-2008).pdf

709-mum-2005-correspondence-received.pdf

709-mum-2005-description (complete).pdf

709-MUM-2005-DESCRIPTION(COMPLETE) 20-6-2008.pdf

709-MUM-2005-DRAWING 20-6-2008.pdf

709-mum-2005-drawing(20-06-2008).pdf

709-mum-2005-drawings.pdf

709-MUM-2005-EXAMINATION REPORT 20-6-2008.pdf

709-MUM-2005-FORM 1 20-6-2008.pdf

709-mum-2005-form 1(17-06-2005).pdf

709-mum-2005-form 18(11-08-2006).pdf

709-mum-2005-form 2(granted)-(20-06-2008).doc

709-mum-2005-form 2(granted)-(20-06-2008).pdf

709-MUM-2005-FORM 2(TITLE PAGE) 20-6-2008.pdf

709-mum-2005-form 26(20-06-2008).pdf

709-MUM-2005-FORM 3 20-6-2008.pdf

709-mum-2005-form 3(20-02-2005).pdf

709-mum-2005-form 3(20-06-2008).pdf

709-MUM-2005-FORM 5 20-6-2008.pdf

709-mum-2005-form 5(20-06-2008).pdf

709-mum-2005-form-1.pdf

709-mum-2005-form-2.doc

709-mum-2005-form-2.pdf

709-mum-2005-form-26.pdf

709-mum-2005-form-3.pdf

709-MUM-2005-OTHER DOCUMENT 20-6-2008.pdf

709-MUM-2005-PETITION UNDER RULE 137 20-6-2008.pdf

709-MUM-2005-POWER OF ATTORNEY 20-6-2008.pdf

abstract1.jpg