Driving system for reluctance type motor
First Claim
1. A driving system for controlling actuation of a reluctance type motor with a rotor and an armature having exciting coils, comprising:
- a position detecting device, operatively connected to the rotor, for generating a position detecting signal representing an actual rotational position of the rotor;
a division circuit for receiving torque data from the reluctance type motor and a voltage proportional to a command exciting current, dividing the torque data by the voltage proportional to the command exciting current and outputting torque ripple data;
a memory device pre-memorizing the torque ripple data as a function of the command exciting current and a rotor rotational position; and
a current supply control circuit, operatively connected to the exciting coils, said position detecting device and said memory device, for supplying to each one of the exciting coils an exciting current corresponding to a corrected command exciting current corrected by the torque ripple data read out from said memory device on the basis of the position detecting signal and the command exciting current, said current supply control circuit including;
a multiplication circuit, receiving the torque ripple data and the command exciting current, multiplying the torque ripple data with the command exciting current and outputting a corrected command exciting current.
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Accused Products
Abstract
This driving system can reduce ripple components included in the output torque of reluctance type motors. During a driving operation of a motor (3), a data selecting readout unit (51) decodes an output of an A/D converter (18a) which corresponds to a command exciting current value fed from a supply current control circuit, and selects one of memories (51a to 51e) corresponding to the command exciting current value. Further the torque ripple data from the selected memory is successively read out in accordance with an address output of an address counter (57) that is renewed every time a shaft encoder (6) sends out an output and, in turn, supplies it through a D/A converter (59) to the current supply control circuit (61). The current supply control circuit corrects the command exciting current based on the torque ripple data, and controls actuation of the motor by the corrected command exciting current to remove the torque ripple in the motor output torque.
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Citations
15 Claims
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1. A driving system for controlling actuation of a reluctance type motor with a rotor and an armature having exciting coils, comprising:
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a position detecting device, operatively connected to the rotor, for generating a position detecting signal representing an actual rotational position of the rotor; a division circuit for receiving torque data from the reluctance type motor and a voltage proportional to a command exciting current, dividing the torque data by the voltage proportional to the command exciting current and outputting torque ripple data; a memory device pre-memorizing the torque ripple data as a function of the command exciting current and a rotor rotational position; and a current supply control circuit, operatively connected to the exciting coils, said position detecting device and said memory device, for supplying to each one of the exciting coils an exciting current corresponding to a corrected command exciting current corrected by the torque ripple data read out from said memory device on the basis of the position detecting signal and the command exciting current, said current supply control circuit including; a multiplication circuit, receiving the torque ripple data and the command exciting current, multiplying the torque ripple data with the command exciting current and outputting a corrected command exciting current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A driving system for controlling actuation of a reluctance type motor having a rotor and having an armature having exciting coils, comprising:
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a position detecting device generating a position detecting signal representing an actual rotational position of the rotor; a rotational body disposed synchronously rotatable together with the rotor and having an output peripheral surface comprising a plurality of axial regions each having physical values respectively corresponding to torque ripple data as a function of a corresponding one of a plurality of command exciting current values and a rotor rotational position; a physical value detector having a detecting portion disposed shiftable along an axial direction of said rotational body so as to be able to face to any one of said plurality of axial regions on the outer peripheral surface of said rotational body; a servo device for positioning said detecting portion so that said detecting portion faces one of said plurality of axial regions on the outer peripheral surface of said rotational body which corresponds to the command exciting current; and a current supply control circuit for supplying each exciting coil with an exciting current corresponding to the command exciting current corrected by the torque ripple data corresponding to a physical value detected by said physical value detector in which said detecting portion is thus positioned, said current supply control circuit including; a multiplication circuit receiving the torque ripple data and the command exciting current and multiplying the torque ripple data with the command exciting current and outputting a corrected command exciting current. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification