Invention Grant
- Patent Title: Gearless wheel motor drive system
- Patent Title (中): 无齿轮电机驱动系统
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Application No.: US10903929Application Date: 2004-07-29
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Publication No.: US07262536B2Publication Date: 2007-08-28
- Inventor: Khwaja M. Rahman , Silva Hiti , Nitinkumar R. Patel , Terence G. Ward , James M. Nagashima , Fabio Crescimbini , Federico Caricchi
- Applicant: Khwaja M. Rahman , Silva Hiti , Nitinkumar R. Patel , Terence G. Ward , James M. Nagashima , Fabio Crescimbini , Federico Caricchi
- Applicant Address: US MI Detroit
- Assignee: General Motors Corporation
- Current Assignee: General Motors Corporation
- Current Assignee Address: US MI Detroit
- Agent Christopher DeVries
- Main IPC: H02K21/12
- IPC: H02K21/12

Abstract:
Methods and apparatus are provided for an electric vehicle embodying an axial flux traction motor directly coupled to a wheel thereof. The fraction motor includes a stator having coils for producing a magnetic field, an annular rotor magnetically coupled to the stator and mechanically to an output shaft Permanent magnets of alternating polarity are mounted on the annular rotor. Magnetic shunts bridge a portion of the stator slots above the coils. The magnets are arranged in groups with group-to-group spacing exceeding magnet-to-magnet spacing. Adjacent edges of the magnets diverge. The method comprises, looking up d- and q-axis currents to provide the requested torque and motor speed for the available DC voltage, combining at least one of the d- and q-axis currents with a field weakening correction term, converting the result from synchronous to stationary frame and operating an inverter therewith to provide current to the coils of the motor.
Public/Granted literature
- US20050035676A1 Gearless wheel motor drive system Public/Granted day:2005-02-17
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