Electric motor with field weakening

Details Electric motor with field weakening Electric motor with field weakening

2011-06-14

2011-06-14

Leung, Quyen (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S191000, C310S192000

Reexamination Certificate

active

07960888

ABSTRACT:
An electric motor comprising a rotor, a stator and a field weakening device. The rotor has a plurality of magnets mounted thereto, and the stator is located adjacent to the rotor and has a plurality of slots defined therein. The slots define raised teeth and are wound with electrical wiring to generate a magnetic field when the wiring is energized with current. The field weakening device is made from a highly magnetically permeable material and a comparatively lower magnetically permeable material. The field weakening device is disposed between the rotor and the stator and is selectively movable between a first position to align the highly magnetically permeable material between the teeth of the stator and the magnets of the rotor and a second position to align the comparatively lower magnetically permeable material between the teeth of the stator and the magnets of the rotor.

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Nipp, Eckart “Alternative to Field-Weakening of Surface-Mounted Permanent-Magnet Motors For Variable-Speed Drives”, Royal Institute of Technology, EKC, S-100 44 Stockholm, Sweden, IEEE (1995) pp. 191-198.

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