US6630764B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
High performance brushless motor and drive for an electrical vehicle motorization
Assignee: Bionx Canada Inc
•
Filing: 1999-04-01
•
Granted: 2003-10-07
•
Expires: 2019-04-01
Abstract
Abstract The system includes a permanent magnet three-phase motor and an electronic current controlled inverter by pulse width modulation. The motor has twenty-two poles and twenty-four slots, three phases and a cylindrical outer rotor. This structure minimizes torque ripple and maximizes energy efficiently. All coil windings are wound around the stator teeth. Several winding configurations are proposed and a special one with only one coil per slot. The motor phases are supplied by alternating rectangular current waveforms. A specific inverter control system is described to maximize efficiency and reduce current ripple and electromagnetic interference under motorizing or generating operations. The current control is realized by using the mosfets voltage for the current measurement.
Inventors
- 👤 Jean-Yves Dubé
- 👤 Jérôme Cros
- 👤 Philippe Viarouge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:55
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/28; B; B60; B60L; B60L15/00; B60L15/02; B60L15/08; B60L50/00; B60L50/50; B60L50/52; B60L50/53; H02K21/00; H02K21/12; H02K21/22; H02K29/00; H02K29/03; B60L2200/00; B60L2200/12; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
190 words
A brushless DC motor/generator ( 10 ) comprising; a cylindrical outer rotor ( 19 ) with twenty two poles ( 20 ) constructed with segments of permanent magnet material alternatively magnetized north and south, a stator core ( 8 ) of ferromagnetic material spaced inwardly of said rotor and defining a magnetic clearance gap ( 9 ) there between, said stator core having twenty-four slots ( 18 ) and defining teeth ( 23 ) between said slots ( 18 ), a three phase winding with coils ( 7 ) of insulated wire being wound around the teeth, an electronic supply ( 11 ) including a power electronics system and a current control circuit means ( 14 ) to control the torque of said motor ( 10 ) and therefore its arresting force for braking a wheel ( 53 ) of devices on which people are displaced by said DC motor motorizing said wheel, characterized in that there is one coil per slot with predetermined connection patterns: A′, C, C, B′, B′, A, A, C′, C′, B, B, and A′ resulting in reduced torque ripple without any slot or magnet skewing.
Claim 2
Dependent Claim
190 words
A brushless DC motor/generator ( 10 ) comprising; a cylindrical outer rotor ( 19 ) with twenty two poles ( 20 ) constructed with segments of permanent magnet material alternatively magnetized north and south, a stator core ( 8 ) of ferromagnetic material spaced inwardly of said rotor and defining a magnetic clearance gap ( 9 ) there between, said stator core having twenty-four slots ( 18 ) and defining teeth ( 23 ) between said slots ( 18 ), a three phase winding with coils ( 7 ) of insulated wire being wound around the teeth, an electronic supply ( 11 ) including a power electronics system and a current control circuit means ( 14 ) to control the torque of said motor ( 10 ) and therefore its arresting force for braking a wheel ( 53 ) of devices on which people are displaced by said DC motor motorizing said wheel, characterized in that there is one coil per slot with predetermined connection patterns: A′, C, C, B′, B′, A, A, C′, C′, B, B, and A′ resulting in reduced torque ripple without any slot or magnet skewing.
Claim 3
Dependent Claim
72 words
A brushless DC motor/generator ( 10 ) as claimed in claim 1 characterized in that a multiple combination of additions of the number of said twenty-two poles and said twenty-four slots ( 18 ), such as forty-four said poles and forty-eight said slots, or sixty-six said poles and seventy-two said slots or ninety-six said poles and eighty-eight said slots; and a wound winding ( 7 ) around said teeth ( 23 ).
Claim 4
Dependent Claim
34 words
A brushless DC motor/generator ( 10 ) as claimed in claim 1 characterized in that there are three Hall sensors ( 24 ) mounted near said air gap ( 25 ) at predetermined positions.
Claim 5
Dependent Claim
60 words
A brushless DC motor as claimed in claim 3 having a power electronics pulse width modulation driver and control system, said pulse width modulation driver having a three phase inverter including six power mosfets, a current control system coupled to said inverter for generating 120 electrical degrees rectangular phase current pulses, said control system using a single switch modulation technique.
Claim 6
Dependent Claim
98 words
A brushless DC motor/generator ( 10 ) as claimed in claim 4 characterized in that said single switch modulation technique is comprised of three of said mosfets ( 30 ) being connected at an upper side of said inverter ( 28 ) and remain switched “on” by a modulation signal during a motor operation mode of said motor ( 10 ), three others of said mosfets ( 30 ) being connected as a lower side of said inverter ( 28 ) and used to measure motor phase currents during all sequences of the mosfets of said upper side.
Claim 7
Dependent Claim
52 words
A brushless DC motor as claimed in claim 5 wherein said mosfets of said upper side of said inverter are switched “off” during a generator operation mode of said DC motor, and wherein a modulation signal is applied on a gate of said three mosfets on said lower side of said inverter.
Claim 8
Dependent Claim
206 words
A brushless DC motor/generator ( 10 ) comprising; a cylindrical outer rotor ( 19 ) with twenty two poles ( 20 ) constructed with segments of permanent magnet material alternatively magnetized north and south, a stator core ( 8 ) of ferromagnetic material spaced inwardly of said rotor and defining a magnetic clearance gap ( 9 ) there between, said stator core having twenty-four slots ( 18 ) and defining teeth ( 23 ) between said slots ( 18 ), a three phase winding with coils ( 7 ) of insulated wire being wound around the teeth, an electronic supply ( 11 ) including a power electronics system and a current control circuit means ( 14 ) to control the torque of said motor ( 10 ) and therefore its arresting force for braking a wheel ( 53 ) of devices on which people are displaced by said DC motor motorizing said wheel, characterized in that there are two coils ( 7 ) per slot ( 18 ) with predetermined connection patterns: C′, C, C′, C, B, B′, B, B′, A′, A, A′, A, C, C′, C, C′, B′, B, B′, A, A′, A, A′, resulting in reduced torque ripple without any slot or magnet skewing.
Claim 9
Dependent Claim
206 words
A brushless DC motor/generator ( 10 ) comprising; a cylindrical outer rotor ( 19 ) with twenty two poles ( 20 ) constructed with segments of permanent magnet material alternatively magnetized north and south, a stator core ( 8 ) of ferromagnetic material spaced inwardly of said rotor and defining a magnetic clearance gap ( 9 ) there between, said stator core having twenty-four slots ( 18 ) and defining teeth ( 23 ) between said slots ( 18 ), a three phase winding with coils ( 7 ) of insulated wire being wound around the teeth, an electronic supply ( 11 ) including a power electronics system and a current control circuit means ( 14 ) to control the torque of said motor ( 10 ) and therefore its arresting force for braking a wheel ( 53 ) of devices on which people are displaced by said DC motor motorizing said wheel, characterized in that there are two coils ( 7 ) per slot ( 18 ) with predetermined connection patterns: C′, C, C′, C, B, B′, B, B′, A′, A, A′, A, C, C′, C, C′, B′, B, B′, A, A′, A, A′, resulting in reduced torque ripple without any slot or magnet skewing.
Claim 10
Dependent Claim
34 words
A brushless DC motor/generator ( 10 ) as claimed in claim 1 characterized in that said motor ( 10 ) is also used as a wheel braking device when used in a generator mode.
Claim 11
Dependent Claim
86 words
A brushless DC motor/generator ( 10 ) as claimed in claim 1 characterized in that said control circuit means ( 14 ) comprises: a power electronics three phase inverter ( 28 ) provided with six power mosfets ( 30 ), a current control system ( 14 ) coupled to said inverter ( 28 ) for generation of 120 electrical degrees rectangular phase current pulses, an electronic control system ( 32 ) for both a motor and a generator operation mode of said motor ( 10 ).
Claim 12
Dependent Claim
42 words
An electronic control system as claimed in claim 9 wherein voltages across thereof said mosfets on a lower side of said inverter are used to generate a current measurement for the purpose of motor current control of said single switch modulation technique.
Claim 13
Dependent Claim
71 words
A brushless DC motor/generator ( 10 ) as claimed in claim 7 characterized in that a multiple combination of additions of the number of said twenty-two poles and said twenty-four slots ( 18 ), such as forty-four said poles and forty-eight said slots, or sixty-six said poles and seventy-two said slots or ninety-six said poles and eighty-eight said slots; and a winding wound ( 7 ) around said teeth 23 ).
Claim 14
Dependent Claim
34 words
A brushless DC motor/generator ( 10 ) as claimed in claim 7 characterized in that there are three Hall sensors ( 24 ) mounted near said air gap ( 25 ) at predetermined positions.
Claim 15
Dependent Claim
34 words
A brushless DC motor/generator ( 10 ) as claimed in claim 7 characterized in that said motor ( 10 ) is also used as a wheel braking device when used in a generator mode.
Claim 16
Dependent Claim
86 words
A brushless DC motor/generator ( 10 ) as claimed in claim 7 characterized in that said control circuit means ( 14 ) comprises: a power electronics three phase inverter ( 28 ) provided with six power mosfets ( 30 ), a current control system ( 14 ) coupled to said inverter ( 28 ) for generation of 120 electrical degrees rectangular phase current pulses, an electronic control system ( 32 ) for both a motor and a generator operation mode of said motor ( 10 ).
References Cited (Backward Citations)
US3783359A
Cited
US4719378A
Cited
JPS648897A
Cited
US5006745A
Cited
JPH044703A
Cited
US5164622A
Cited
EP0521709B1
Cited
GB2289991A
Cited
US5675196A
Cited
US5723931A
Cited
JPH10285891A
Cited
US6335582B1
Cited
US6166475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-10-06 | 2007-04-07 | 2007-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-10-06 | 2011-04-07 | 2011-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-10-06 | 2015-04-07 | 2015-10-07 | $7700.00 | Window Closed / Lapsed |