Electric motor with permanent magnet excitation and rotor...

Details Electric motor with permanent magnet excitation and rotor... Electric motor with permanent magnet excitation and rotor...

2006-06-08

2010-10-19

Leung, Quyen (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S052000, C310S054000

Reexamination Certificate

active

07816824

ABSTRACT:
The invention relates to an electric motor (1) with permanent magnet excitation, comprising a stator (2), a rotor (8), comprising a hollow shaft (13) on which the permanent magnets (9) are positioned. The hollow shaft (13) is sealed tight against an output shaft (7) at least at the end faces thereof and a suitable coolant is provided in the enclosed cavity (14) which, during operation of the electric motor, evaporates from the relatively hot hollow shaft in the region of the permanent magnets (9) and condenses in the region of the relatively cold output shaft (7) such as to introduce a radial and axial heat transport.

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Markert, W.: “Einsatz von Wärmerohren zur Kühlung elektrischer Maschinen” in: Elektrie 36, vol. 1, 1982, pp. 30-32.

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