Title of Invention

VARIABLE FREQUENCY DRIVE

Abstract

ABSTRACT Fig-1 shows variable frequency drive. The drive consists of three slip-rings (l).The three slip rings are partially with non-conducting material (5) and remaining part is with conducting material. The three slip-rings are mounted on shaft (6) at 120 degree apart with reference to non-conducting material (5). The slip-rings and shaft are separated from insulating material. Three brushes (2,3 & 4) are mounted on each slip-ring (1). The +ve & - ve brushes (1&2) are mounted 180 degree apart on each slip-ring (1) where the slip-rings are with conducting material (5). The +ve brush and -ve brush are connected to +ve & -ve DC supply respectively. The out put voltage collecting brush (4) is mounted on each slip-ring where the slip -rings are completely with conducting material The shaft (6) is connected to variable speed motor (7). The DC +ve & -ve supply is given to the brushes (2&3) respectively. The shaft (6) is made to rotate by variable speed motor (7). As the slip-ring (1) starts rotating +ve brush (2) & -ve brush (3) which are mounted 180 degree apart comes in contact with conducting and non-conducting material of slip-rings (1) alternately. So +ve and-ve voltage flows alternately into the collecting brush (4) through slip-rings. There fore the out put voltage from collecting brush (4) is AC three phase square wave voltages. As the slip-rings (1) are mounted on shaft (6) at 120 degree apart with reference to the non-conducting material (5). As shown in fig-2 the position of slip-ring with brushes and wave forms. The three phases R,Y,B are 120 degree apartin time phase. By varying speed of variable speed motor (7) the contact time of + ve & - ve brush (2&3) with conducting and non-conducting material (5) of slip-ring (1) can be varied. There fore the frequency of out put voltage is proportional to the speed of variable speed motor (7) and the generated out put voltage is Ac three phase square wave voltage. By the combination of conducting and non-conducting material of slip-ring various wave forms can be generated.

Full Text

FQRM 2 THE PATENTS ACT, 1970 (39 of 1970) Provisional / COMPLETE SPECIFICATION (See section 10; rule 13) 1. Title of the invention. 1. Variable Frequency drive 2. Repeat the columns (a) to (c) if there 2.2. (a). 3__________________________ are more than one applicant. (b).4__________________________ (c)-5__________________________ (a).3__________________________ 3.1nsertthenameinfiill. (b). 4__________________________ The family or principal name in the beginning' if the applicant is a natural (c). 5__________________________ 4. Insert the complete address including Thammineni Vasu Flat No: 1, A-7, Sivai Society KrishnaNagar, Chichwad Pune-411019 Insert the nationality Indian The following specification (particularly)6... describes 6. Strike out in case of. provisional the nature of this invention (and the manner in which it is specification. to be performed)':- Copy of details attached 7. Description of the invention. 3.. 7,Copy of complete specification attached 8. Inapplicable in case of provisional 4. I/ we claim:- Copy of Claims attached specification. Dated this 29 day of December 2006 Signature ….9… 9. To be signed by the applicant or his (T. Vasu ) ..10.. Applicant authorised registered patent agent. 10. Name of the natural person who has signed. 11. (a) Not applicable in case of 5.. 11.. Copy of Abstract attached provisional specification Abstract of the invention. (b) Separate sheet to be used for To this column. The Controller of Patents, The Patent office. At Mumbai …………………………………. Note: Strike out whichever is not applicable Tide of invention Variable frequency drive. Field of invention Field of invention relates to generation of AC three phase variable frequency voltage. Background of known art In prior art electronic devices are used to generate AC three phase variable frequency voltage. These drives are expensive. Objective of invention The objective of invention is to generate AC variable frequency square wave voltage. These drives are inexpensive and can be used for high power ratings. Summary of invention The variable frequency AC square wave voltage is generated by flow of - ve and + ve DC voltage to three slip-rings through brushes. The slip-rings are partially with nonconducting material. The slip-rings are mounted on shaft at 120 degree apart with reference to non-conducting material on slip-rings. The -ve and +ve brushes are mounted at 180 degree apart on each slip-ring. To collect out put voltage one brush is mounted on each slip-ring where the slip-ring is completely with conducting material. The shaft is driven by variable frequency motor, as the shaft rotates +ve and-ve voltage flows alternately into out put voltage collecting brush, through slip-ring. There fore the out put voltage is AC three phase square wave voltages. As the sliprings are mounted 120 degree apart on shaft the three phases are 120 degree apart in time phase. By varying speed of variable speed motor frequency of voltage can be varied. There fore the out put voltage is proportional to the speed of variable speed motor. Brief description of drawing According to this invention, The variable frequency drive comprising of three slip-rings mounted on shaft, The -ve +ve brushes are mounted 180 degree apart on each slip-ring, The voltage collecting brush is mounted on each slip-ring, and the shaft is connected to variable speed motor. Brief description of invention with reference to drawing Fig-1 shows variable frequency drive The drive consists of three slip-rings (l).The three slip rings are partially with non-conducting material (5) and remaining part is with conducting material. The three slip-rings are mounted on shaft (6) at 120 degree apart with reference to non-conducting material (5). The slip-rings and shaft are separated from insulating material. Three brushes (2, 3&4) are mounted on each slip-ring (1). The +ve & - ve brushes (2&3) are mounted 180 degree apart on each slip-ring (1) where the slip-rings are with non-conducting material (5). The +ve brush and-ve brush are connected to +ve & -ve DC supply respectively. The out put voltage collecting brush (4) is mounted on each slip-ring where the slip —rings are completely with conducting material. The shaft (6) is connected to variable speed motor (7). The DC +ve & -ve supply is given to the brushes (2&3) respectively. The shaft (6) is made to rotate by variable speed motor (7). As the slip-rings (1) starts rotating +ve brush (2) & -ve brush (3) which are mounted 180 degree apart comes in contact with conducting and non-conducting material of slip-rings (1) alternately. So +ve and-ve voltage flows alternately into the collecting brush (4) through slip-rings. There fore the out put voltage from collecting brush (4) is AC three phase square wave voltages. As the slip-rings (1) are mounted on shaft (6) at 120 degree apart with reference to the non-conducting material (5).As shown in fig-2 the position of slip-ring with brushes and wave forms. The three phases R, Y, B are 120 degree apart in time phase. By varying speed of variable speed motor (7) the contact time of + ve &-ve brush (2&3) with conducting and non-conducting material (5) of slip-rings (1) can be varied. There fore the frequency of out put voltage is proportional to the speed of variable speed motor (7) and the generated out put voltage is AC three phase square wave voltage. By the combination of conducting and non-conducting material of slip-ring various wave forms can be generated. Claims 1) Fig-1 shows variable frequency drive. The drive consists of three slip-rings (l).The three slip rings are partially with non-conducting material (5) and remaining part is with conducting material. The three slip-rings are mounted on shaft (6) at 120 degree apart with reference to non-conducting material (5). The slip-rings and shaft are separated from insulating material. Three brushes (2,3&4) are mounted on each slip-ring (1). The +ve & - ve brushes (2&3) are mounted 180 degree apart on each slip-ring (1) where the slip-rings are with non-conducting material (5). The +ve brush and-ve brush are connected to +ve & -ve DC supply respectively. The out put voltage collecting brush (4) is mounted on each slip-ring where the slip-rings are completely with conducting material. The shaft (6) is connected to variable speed motor (7). 2) As claimed in claim l. The DC +ve & -ve supply is given to the brushes (2&3) respectively. The shaft (6) is made to rotate by variable speed motor (7). As the sliprings (1) starts rotating +ve brush (2) & -ve brush (3) which are mounted 180 degree apart comes in contact with conducting and non-conducting material of slip-rings (1) alternately. So +ve and-ve voltage flows alternately into the collecting brush (4) through slip-rings. There fore the out put voltage from collecting brush (4) is AC three phase square wave voltage. 3) As claimed in claim 1. As the slip-rings (1) are mounted on shaft (6) at 120 degree apart with reference to the non-conducting material (5).As shown in fig-2 the position of slip-ring with brushes and wave forms. The three phases R,Y,B are 120 degree apart in time phase. 4) As claimed in claim 1. By varying speed of variable speed motor (7) the contact time of + ve &-ve brush (2&3) with conducting and non-conducting material (5) of slip-rings (1) can be varied. There fore the frequency of out put voltage is proportional to the speed of variable speed motor (7) and the generated out put voltage is AC three phase square wave voltage. 5) As claimed in claim 1. By the combination of conducting and non-conducting material of slip-ring various wave forms can be generated. 6) As claimed in claims 1 to 5 are described in with respect to accompanying drawing ABSTRACT Fig-1 shows variable frequency drive. The drive consists of three slip-rings (l).The three slip rings are partially with non-conducting material (5) and remaining part is with conducting material. The three slip-rings are mounted on shaft (6) at 120 degree apart with reference to non-conducting material (5). The slip-rings and shaft are separated from insulating material. Three brushes (2, 3&4) are mounted on each slip-ring (1). The +ve & - ve brushes (1&2) are mounted 180 degree apart on each slip-ring (1) where the slip-rings are with conducting material (5). The +ve brush and -ve brush are connected to +ve & -ve DC supply respectively. The out put voltage collecting brush (4) is mounted on each slip-ring where the slip -rings are completely with conducting material The shaft (6) is connected to variable speed motor (7). The DC +ve & -ve supply is given to the brushes (2&3) respectively. The shaft (6) is made to rotate by variable speed motor (7). As the slip-ring (1) starts rotating +ve brush (2) & -ve brush (3) which are mounted 180 degree apart comes in contact with conducting and non-conducting material of slip-rings (1) alternately. So +ve and-ve voltage flows alternately into the collecting brush (4) through slip-rings. There fore the out put voltage from collecting brush (4) is AC three phase square wave voltages. As the slip-rings (1) are mounted on shaft (6) at 120 degree apart with reference to the non-conducting material (5). As shown in fig-2 the position of slip-ring with brushes and wave forms. The three phases R,Y,B are 120 degree apartin time phase. By varying speed of variable speed motor (7) the contact time of+ ve &ve brush (2&3) with conducting and non-conducting material (5) of slip-ring (1) can be varied. There fore the frequency of out put voltage is proportional to the speed of variable speed motor (7) and the generated out put voltage is Ac three phase square wave voltage. By the combination of conducting and non-conducting material of slip-ring various wave forms can be generated.

Documents:

2171-MUM-2006-ABSTRACT(24-6-2008).pdf

2171-mum-2006-abstract(26-09-2006).doc

2171-mum-2006-abstract(26-09-2006).pdf

2171-mum-2006-abstract-1.jpg

2171-mum-2006-abstract.doc

2171-mum-2006-abstract.pdf

2171-MUM-2006-CLAIMS(CANCELLED PAGE)-(24-6-2008).pdf

2171-mum-2006-claims(granted)(26-09-2006).doc

2171-mum-2006-claims(granted)(26-09-2006).pdf

2171-mum-2006-claims.doc

2171-mum-2006-claims.pdf

2171-mum-2006-correspondence(26-09-2008).pdf

2171-MUM-2006-CORRESPONDENCE(26-9-2008).pdf

2171-mum-2006-correspondence(ipo)-(24-12-2008).pdf

2171-MUM-2006-CORRESPONDENCE(IPO)-(24-6-2008).pdf

2171-mum-2006-description (complete).pdf

2171-MUM-2006-DESCRIPTION(COMPLETE)-(24-6-2008).pdf

2171-MUM-2006-DRAWING(24-6-2008).pdf

2171-mum-2006-drawing(26-09-2006).pdf

2171-MUM-2006-FORM 1(24-6-2008).pdf

2171-mum-2006-form 1(26-09-2008).pdf

2171-mum-2006-form 1(29-12-2006).pdf

2171-mum-2006-form 13(05-05-2008).pdf

2171-mum-2006-form 18(22-03-2007).pdf

2171-mum-2006-form 2(24-6-2008).pdf

2171-mum-2006-form 2(granted)-(26-09-2009).doc

2171-mum-2006-form 2(granted)-(26-09-2009).pdf

2171-MUM-2006-FORM 2(TITLE PAGE)-(24-6-2008).pdf

2171-mum-2006-form 3(26-09-2008).pdf

2171-mum-2006-form 9(29-12-2006).pdf

2171-mum-2006-form-1.pdf

2171-mum-2006-form-2.doc

2171-mum-2006-form-2.pdf

2171-mum-2006-form-9.pdf

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