Methods and apparatus for preventing demagnetization in...

Details Methods and apparatus for preventing demagnetization in... Methods and apparatus for preventing demagnetization in...

2009-03-18

2010-11-30

Leung, Quyen (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S156430, C310S156560, C310S156570, C310S156380

Reexamination Certificate

active

07843100

ABSTRACT:
An internal permanent magnet machine (“IPM machine”) of the type used, for example, with traction motors and hybrid electric vehicles, includes a rotor having a plurality of ferrite magnets arranged in one or more layers, wherein at least one of the layers includes rare earth magnets (e.g., NdFeB magnets) adjacent to the ferrite magnets to prevent or reduce demagnetization.

REFERENCES:
patent: 2005/0110355 (2005-05-01), Sakuma et al.
patent: 2006/0061226 (2006-03-01), Kim et al.
patent: 2007/0138892 (2007-06-01), Horst
patent: 2007/0159021 (2007-07-01), Horst

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