Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1998-10-02
2000-04-11
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
310 905, H02K 1100
Patent
active
060491485
ABSTRACT:
A rotary motor and a rotary magnetic bearing are integrated in a compact assembly that is contact-less. A stator assembly surrounds a ferromagnetic rotor with an annular air gap which can accommodate a cylindrical wall, e.g. of a chamber for semiconductor wafer processing. The stator assembly has a permanent magnet or magnets sandwiched between vertically spaced magnetic stator plates with plural pole segments. The rotor is preferably a ring of a magnetic stainless steel with complementary pole teeth. The stator assembly (i) levitates and passively centers the rotor along a vertical axis and against tilt about either horizontal axis, (ii) provides a radial position bias for the rotor, and (iii) establishes a motor flux field at the rotor poles. Polyphase coils wound on the stator plates produce a rotating flux field that drives the rotor as a synchronous homopolar motor. A rotor without pole teeth allows operation with an asynchronous inductive drive. A controller energizes control coils wound on each stator pole segment in response to a sensed physical position of the rotor. The control coils provide active radial position control and can actively damp tip and tilt oscillations that may overcome the passive centering.
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Downer James
Eisenhaure David
Gondhalekar Vijay
Hockney Richard
Jagannathan Shankar
Neuner George W.
Ramirez Nestor
SatCon Technology Corporation
Waks Joseph
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