High performance brushless motor and drive for an electrical vehicle motorization
First Claim
1. 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.
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Accused Products
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.
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Citations
14 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10)
- 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;
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7. 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. - View Dependent Claims (11, 12, 13, 14)
- 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;
Specification