Electric power steering system including a permanent magnet...

Details Electric power steering system including a permanent magnet... Electric power steering system including a permanent magnet...

2006-04-25

2006-04-25

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S156030, C310S184000

Reexamination Certificate

active

07034423

ABSTRACT:
An electric power steering system for a vehicle includes a steering wheel and a steering shaft that is connected to the steering wheel. A worm gear is connected to the steering shaft. A worm is threadably engaged to the worm gear. A permanent magnet motor is connected to the worm. The permanent magnet motor includes a stator with twelve slots and a rotor with ten poles. The rotor includes one or more axial rotor sections. If more than one axial rotor section is employed, the axial rotor sections are rotationally offset. The axial rotor sections are rotationally offset by an offset angle that is equal to a cogging angle divided by the number of axial rotor sections. The rotor includes breadloaf, spoke, radial or arc permanent magnets.

REFERENCES:
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patent: 5164622 (1992-11-01), Kordik
patent: 5753991 (1998-05-01), Couture
patent: 5982067 (1999-11-01), Sebastian et al.
patent: 6140728 (2000-10-01), Tomita et al.
patent: 6262507 (2001-07-01), Sato et al.
patent: 0 392 028 (1990-10-01), None
patent: 0 483 372 (1992-05-01), None
“Influence of Design Parameters on Cogging Torque in Permanent Magnet Machines”, Zhu Z Q et al., IEEE transactions on Energy Conversion, IEEE Inc., New York, US, vol. 15, NR. 4 pp. 407-412.

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