Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2006-07-18
2006-07-18
Schuberg, Darren (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S168000, C318S685000, C318S696000
Reexamination Certificate
active
07078839
ABSTRACT:
The present invention relates to a self-bearing step motor, and more particularly, to self-bearing step motor system and a control method thereof, wherein a rotor can be supported by magnetic force without adding an additional winding for supporting the rotor to a step motor having no mechanical bearing for supporting the rotor. The self-bearing step motor system of the present invention comprises a self-bearing step motor including a rotor having a plurality of rotor teeth, a stator having a plurality of stator teeth, a plurality of separate windings wound respectively around the plurality of stator teeth, and a plurality of sensors for measuring geometric deviation of the rotor; and a controller which transforms a torque current for causing the rotor to rotate and control currents for performing a bearing function of supporting the rotor into predetermined supply currents capable of generating magnetic force for allowing the rotor to be supported while causing the rotor to rotate in accordance with outputs of the sensors and position angles of the plurality of windings, which are fed back to the controller, and simultaneously distributes the supply currents among the plurality of windings grouped so that the same phase currents can be supplied thereto. According to the present invention, the self-bearing step motor can replace the conventional step motor. In particular, owing to advantages of the magnetic levitation technology, the self-bearing step motor can be used semipermanently even in a severe environment needed for a super clean and vacuum system without maintenance thereof. Thus, a wide industrial application thereof can be obtained.
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Takemoto et al., “Improved Analysis of a Bearingless Switched Reluctance Motor” pp. 26-33, IEEE Transactions on Industry Applications, vol. 37, No. 1 Jan./Feb. 2001.
IEEE Transaction of Industry Applications, Jan./Feb. 2001, vol. 37, No. 1, The first four sheets. (note the Received Stamp date of Feb. 23, 2001 on the third sheet.).
Scheuermann David W.
Schuberg Darren
Volpe and Koenig P.C.
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