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 magnetically coupled poles (20) constructed with segments of permanent magnet material alternatively magnetized north and south, a stator having a core (8) of ferromagnetic material spaced inwardly of said rotor and defining a magnetic clearance gap (9) therebetween, 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, therebeing mutual inductance between the phases of said stator, 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 an additional two coils (7) per slot (18) with predetermined connection patterns;
C, C′
, C, C′
, B′
, B, B′
, A′
, A, A′
, A, A′
, C′
, C, C′
, B′
, B, B′
, B, B′
, A′
, A, A′
, C′
, resulting in reduced torque ripple without any slot or magnet skewing, and wherein the magnetic path of flux produced by each phase current is not independent.
11 Assignments
0 Petitions
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. A winding configuration is proposed. 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.
42 Citations
12 Claims
-
1. A brushless DC motor/generator (10) comprising;
- a cylindrical outer rotor (19) with twenty two magnetically coupled poles (20) constructed with segments of permanent magnet material alternatively magnetized north and south, a stator having a core (8) of ferromagnetic material spaced inwardly of said rotor and defining a magnetic clearance gap (9) therebetween, 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, therebeing mutual inductance between the phases of said stator, 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 an additional two coils (7) per slot (18) with predetermined connection patterns;
C, C′
, C, C′
, B′
, B, B′
, A′
, A, A′
, A, A′
, C′
, C, C′
, B′
, B, B′
, B, B′
, A′
, A, A′
, C′
, resulting in reduced torque ripple without any slot or magnet skewing, and wherein the magnetic path of flux produced by each phase current is not independent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a cylindrical outer rotor (19) with twenty two magnetically coupled poles (20) constructed with segments of permanent magnet material alternatively magnetized north and south, a stator having a core (8) of ferromagnetic material spaced inwardly of said rotor and defining a magnetic clearance gap (9) therebetween, 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, therebeing mutual inductance between the phases of said stator, 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 an additional two coils (7) per slot (18) with predetermined connection patterns;
-
9. A power electronics pulse width modulation driver and control system (30) for controlling the torque of a brushless DC motor/generator (10) and its arresting force for braking a wheel (53) of devices on which people are displaced by said DC motor motorizing said wheel, said brushless DC motor/generator having a cylindrical outer rotor (19) with twenty two magnetically coupled poles (20) constructed with segments of permanent magnet material alternatively magnetized north and south, a stator having a core (8) of ferromagnetic material spaced inwardly of said rotor and defining a magnetic clearance gap (9) therebetween, 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), said pulse width modulation driver and control system (30) comprising:
a three phase inverter (28) including six power MOSFETs (29), a current control system (32) being coupled to said inverter (28) for generating 120 electrical degrees rectangular phase current pulses, said control system (14) using a single switch modulation technique. - View Dependent Claims (10, 11, 12)
Specification