Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2007-05-30
2009-08-04
Nguyen, Tran N (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S156430, C310S156450
Reexamination Certificate
active
07569961
ABSTRACT:
The present invention provides a rotor for motors, in which motor torque is kept high and generation of torque ripples is reduced, and what is more, detecting accuracy of a magnetic pole position is not deteriorated. The present invention provides a rotor assembly having a first divided rotor magnetic pole unit15and a second divided rotor magnetic pole unit17are disposed side by side on a surface of a rotor core13in an axial direction of a rotary shaft11. The first divided rotor magnetic pole unit15includes P (P is a positive even number) permanent magnet magnetic pole portions21of a first kind and P (P is the positive even number) salient pole portions23made of a magnetic material, which are alternately disposed in a circumferential direction of the rotary shaft11. The second divided rotor magnetic pole unit17includes P (P is the positive even number) permanent magnet magnetic pole portions25of a second kind which are spaced on another part of the surface of the rotor core13in the circumferential direction of the rotary shaft ii. A spacer27made of a soft magnetic material is disposed in a gap, which is formed due to manufacturing size precision of the permanent magnet magnetic pole portion, between two adjacent permanent magnet magnetic portions of the P permanent magnet magnetic pole portions of the second kind.
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Nguyen Tran N
Rankin , Hill & Clark LLP
Sanyo Denki Co. Ltd.
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