US4075543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of determining the position and connection of multi-pole windings for multi-speed electric machines
Assignee: Bpifrance Financement SA
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Filing: 1976-04-29
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Granted: 1978-02-21
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Expires: 1996-04-29
Abstract
Abstract The invention relates to a novel method for determining the multipole windings of electric induction machines. This method is based on the operational modulation, which consists in modulating a 2p-pole basic winding by q sequences of complex operators (a o , a 1 , . . . a r , . . . a m-1 ) wherein said operators are the m m th roots of the unity in a m - phased system, so that the polarity of the modulated winding is |2p±2q|. In a 3-phased system, the wiring diagram consists e.g. in 9 main branches of windings coupled into 3 main parallel coupled stars, and this diagram requires only 6 outputs and two 3-pole switches for switching from one speed to the other.
Inventors
- 👤 Thuy Nguyen Uyen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:59
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/12; H02K17/14; H02K3/00; H02K3/04; H02K3/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
A method of modifying a one-speed machine, wherein the elementary coils are arranged to provide a 2 p pole machine, into a two-speed machine having 2|p ± q| poles at the other speed, and having an optimum efficiency at both speeds, using only two 3-phased switches, comprising the steps of: choosing a base winding wherein the elementary coils are arranged to provide a 2 p pole machine; dividing the length of the base winding along the air gap into 6 q sectors; bringing the middle of any one of said 6 q sectors into the best coincidence possible with the middle of any one of the poles of any phase of said
Claim 2
Independent Claim
112 words
A method of modifying a one-speed machine, wherein the elementary coils are arranged to provide a 2 p pole machine, into a two-speed machine having 2|p ± q| poles at the other speed, and having an optimum efficiency at both speeds, using only two 3-phased switches, comprising the steps of: choosing a base winding wherein the elementary coils are arranged to provide a 2 p pole machine; dividing the length of the base winding along the air gap into 6 q sectors; bringing the middle of any one of said 6 q sectors into the best coincidence possible with the middle of any one of the poles of any phase of said
Claim 3
Dependent Claim
323 words
2 p pole winding and denoting this sector as the first sector; choosing an arbitrary positive direction for the pole and sector series: referencing the elementary coils of said first sector for connection to the same phase in the 2 p pole configuration as in the 2|p ± q| pole configuration; assigning sector designations 2 to 6 to the sectors following said first sector in the positive direction, and referencing the elementary coils of sectors 2 to 6 for connection in phases which are shifted respectively for sectors 2 to 6 by (π/6), (2π/6), (3π/6), (4π,6), (5π/6) with respect to the phase feeding them in the 2 p pole configuration in the case of the 2|p - q| pole configuration, and in phases which are shifted respectively for sectors 2 to 6 by -π/6, (-2π/6,) -3π/6, -4π/6, -5π/6, with respect to the phase feeding them in the case of the 2|p + q| pole configuration; referencing the elementary coils for each of the q successive groups of 6 sectors for connection the same as is recited above; in the 2|p ± q| pole winding thus determined, eliminating the elementary coils which are detrimental to the winding symmetry, whereby a winding is obtained which has 3 phases which are mutually phase-shifted by exactly 120° and which each comprise the same number of elementary coils; connecting all of the elementary coils remaining after said elimination of said coils detrimental to winding symmetry in a circuit comprising three parallel stars, the ends of which are supplied through a first three-phase switch by three corresponding phases of the power supply source for operation at one of said speeds when said first switch is activated, the middle points of the star arms being respectively short-circuited for each phase and supplied through a second three-phase switch by three corresponding phases of said power supply source for operation at the other of said speeds when said second switch is activated.
Claim 4
Dependent Claim
323 words
2 p pole winding and denoting this sector as the first sector; choosing an arbitrary positive direction for the pole and sector series: referencing the elementary coils of said first sector for connection to the same phase in the 2 p pole configuration as in the 2|p ± q| pole configuration; assigning sector designations 2 to 6 to the sectors following said first sector in the positive direction, and referencing the elementary coils of sectors 2 to 6 for connection in phases which are shifted respectively for sectors 2 to 6 by (π/6), (2π/6), (3π/6), (4π,6), (5π/6) with respect to the phase feeding them in the 2 p pole configuration in the case of the 2|p - q| pole configuration, and in phases which are shifted respectively for sectors 2 to 6 by -π/6, (-2π/6,) -3π/6, -4π/6, -5π/6, with respect to the phase feeding them in the case of the 2|p + q| pole configuration; referencing the elementary coils for each of the q successive groups of 6 sectors for connection the same as is recited above; in the 2|p ± q| pole winding thus determined, eliminating the elementary coils which are detrimental to the winding symmetry, whereby a winding is obtained which has 3 phases which are mutually phase-shifted by exactly 120° and which each comprise the same number of elementary coils; connecting all of the elementary coils remaining after said elimination of said coils detrimental to winding symmetry in a circuit comprising three parallel stars, the ends of which are supplied through a first three-phase switch by three corresponding phases of the power supply source for operation at one of said speeds when said first switch is activated, the middle points of the star arms being respectively short-circuited for each phase and supplied through a second three-phase switch by three corresponding phases of said power supply source for operation at the other of said speeds when said second switch is activated.
Claim 5
Dependent Claim
25 words
A method according to claim 1, further comprising connecting all said eliminated elementary coils between said first 3-phase switch and said ends of the stars.
Claim 6
Dependent Claim
29 words
A method according to claim 1, further comprising connecting all said eliminated elementary coils are connected between said second 3-phase switch and said middle points of the star arms.
Claim 7
Independent Claim
466 words
A method of modifying a one-speed machine wherein the elementary coils are arranged to provide a 2 p pole machine into a two-speed machine having 2(p ± q) poles at the other speed, and having an optimum efficiency at both speeds, using only two 3-phased switches, comprising the steps of: dividing the length of the base winding of said 2 p pole machine along the air gap into 3 q sectors; bringing the middle of any one of said 3 q sectors into the best coincidence possible with the middle of any one of the poles of any phase of said 2 p pole winding and denoting this sector as the first sector; choosing an arbitrary positive direction for the pole and sector series; referencing the elementary coils of said first sector for connection to the same phase in the 2 p pole configuration as in the 2|p ± q| pole configuration; referencing the elementary coils of the second sector taken in said positive direction for connection in the 2|p - q| configuration, to a phase which is shifted by +2π/3 with respect to the phase feeding them in the 2 p pole configuration, or for connection in the 2|p + q | pole configuration, to a phase which is shifted by -2π/3 with respect to the phase feeding them in the 2 p pole configuration; referencing the elementary coils of the third sector taken in said positive direction for connection in the 2|p - q| pole configuration, to a phase which is shifted by +4π/3 with respect to the phase feeding them in the 2 p pole configuration, or for connection in the 2|p + q| pole configuration, to a phase which is shifted by -4π/3 with respect to the phase feeding them in the 2 p pole configuration; referencing the elementary coils for each of the q successive groups of 3 sectors for connection the same as is recited above; in the 2|p ± q| pole winding thus determined, eliminating the elementary coils which are detrimental to the winding symmetry, whereby a winding is obtained which has 3 phases which are mutually phase-shifted by exactly 120° and which each comprise the same number of elementary coils; connecting all of the elementary coils remaining after said elimination of said coils detrimental to winding symmetry in a circuit comprising three parallel stars, the ends of which are supplied through a first 3 phase switch by the three corresponding phases of the power supply source for operation at one of said speeds when said first switch is activated, the node points of said three stars being supplied through a second 3 phase switch by the three corresponding phases of said power supply source, for operation at the other of said speeds when said second switch is activated.
Claim 8
Independent Claim
466 words
A method of modifying a one-speed machine wherein the elementary coils are arranged to provide a 2 p pole machine into a two-speed machine having 2(p ± q) poles at the other speed, and having an optimum efficiency at both speeds, using only two 3-phased switches, comprising the steps of: dividing the length of the base winding of said 2 p pole machine along the air gap into 3 q sectors; bringing the middle of any one of said 3 q sectors into the best coincidence possible with the middle of any one of the poles of any phase of said 2 p pole winding and denoting this sector as the first sector; choosing an arbitrary positive direction for the pole and sector series; referencing the elementary coils of said first sector for connection to the same phase in the 2 p pole configuration as in the 2|p ± q| pole configuration; referencing the elementary coils of the second sector taken in said positive direction for connection in the 2|p - q| configuration, to a phase which is shifted by +2π/3 with respect to the phase feeding them in the 2 p pole configuration, or for connection in the 2|p + q | pole configuration, to a phase which is shifted by -2π/3 with respect to the phase feeding them in the 2 p pole configuration; referencing the elementary coils of the third sector taken in said positive direction for connection in the 2|p - q| pole configuration, to a phase which is shifted by +4π/3 with respect to the phase feeding them in the 2 p pole configuration, or for connection in the 2|p + q| pole configuration, to a phase which is shifted by -4π/3 with respect to the phase feeding them in the 2 p pole configuration; referencing the elementary coils for each of the q successive groups of 3 sectors for connection the same as is recited above; in the 2|p ± q| pole winding thus determined, eliminating the elementary coils which are detrimental to the winding symmetry, whereby a winding is obtained which has 3 phases which are mutually phase-shifted by exactly 120° and which each comprise the same number of elementary coils; connecting all of the elementary coils remaining after said elimination of said coils detrimental to winding symmetry in a circuit comprising three parallel stars, the ends of which are supplied through a first 3 phase switch by the three corresponding phases of the power supply source for operation at one of said speeds when said first switch is activated, the node points of said three stars being supplied through a second 3 phase switch by the three corresponding phases of said power supply source, for operation at the other of said speeds when said second switch is activated.
Claim 9
Dependent Claim
25 words
A method according to claim 4, further comprising connecting all said eliminated elementary coils between said first 3-phase switch and said ends of the stars.
Claim 10
Dependent Claim
26 words
A method according to claim 4, further comprising connecting all said eliminated elementary coils between said second 3-phase switch and said node points of the stars.
Claim 11
Dependent Claim
49 words
A method accoridng to claim 4, further comprising connecting one half of said eliminated elementary coils between said first 3-phase switch and said ends of the stars, and connecting the other half of said eliminated elementary coils between said second 3-phase switch and said node points of the stars.
References Cited (Backward Citations)
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US3686553A
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US3794870A
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US3898543A
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US3927358A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |