Bearingless rotary machine
First Claim
1. A bearingless rotary machine comprising:
- a rotor having secondary current paths;
a stator spaced from said rotor by a gap, said stator having two kinds of windings for imparting a rotating force to said rotor with a rotating M pole drive magnetic field and a levitating and supporting force to said rotor with a rotating N pole control magnetic field added in synchronism with said rotating M pole drive magnetic field, where N=M±
2;
displacement detecting sensors for detecting a displacement of said rotor;
magnetic flux distribution detecting means for detecting an N pole magnetic flux distribution which is generated in the gap between said stator and said rotor; and
correcting means for adjusting said detected control magnetic flux distribution to equal a N pole magnetic field distribution command.
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Accused Products
Abstract
An object of the present invention is to provide a bearingless rotary machine which is capable of stably controlling the levitated position of a rotor of an induction motor even if the rotor comprises a squirrel-cage type rotor that is simple in structure and can easily be manufactured.
A bearingless rotary machine has a rotor having secondary current paths and a stator spaced from the rotor by a gap. The stator has two kinds of windings for imparting a rotating and a levitating and supporting force to the rotor. The rotary machine has a magnetic field command calculator, magnetic flux distribution detecting means and correcting means for adjusting the detected control magnetic flux distribution to coincide with the magnetic field distribution command.
58 Citations
14 Claims
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1. A bearingless rotary machine comprising:
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a rotor having secondary current paths; a stator spaced from said rotor by a gap, said stator having two kinds of windings for imparting a rotating force to said rotor with a rotating M pole drive magnetic field and a levitating and supporting force to said rotor with a rotating N pole control magnetic field added in synchronism with said rotating M pole drive magnetic field, where N=M±
2;displacement detecting sensors for detecting a displacement of said rotor; magnetic flux distribution detecting means for detecting an N pole magnetic flux distribution which is generated in the gap between said stator and said rotor; and correcting means for adjusting said detected control magnetic flux distribution to equal a N pole magnetic field distribution command. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification