Brushless motor drive device
First Claim
1. A brushless motor drive device for driving a multi-phase motor, comprising:
- a current detecting circuit for generating a current detection signal representative of a motor drive current flowing through the multi-phase motor;
an error determining circuit for generating a current error signal representative of a difference between a current command signal and the current detection signal;
a sensing circuit for generating a plurality of sensing signals in response to variations in a magnetic field of the multi-phase motor;
a signal synthesizing circuit for converting the plurality of sensing signals into a plurality of drive signals, such that an amplitude of each of the drive signals is determined in accordance with the current error signal;
a comparing circuit for comparing the plurality of drive signals with a reference signal so as to generate a plurality of pulse signals; and
a switching circuit coupled between a drive voltage source and the multi-phase motor and controlled by the plurality of pulse signals for driving the multi-phase motor,characterized in that;
the signal synthesizing circuit includes a calibrating circuit for adjusting the current error signal in accordance with an amplitude of any of the sensing signals.
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Accused Products
Abstract
A brushless motor drive device has a signal synthesizing circuit for converting a plurality of sensing signals into a plurality of drive signals so as to determine an amplitude of each of the drive signals in accordance with a current error signal. The sensing signals are generated by a sensing circuit in response to variations in a magnetic field of a brushless multi-phase motor. The current error signal is representative of a difference between a current command signal and a motor drive current. The signal synthesizing circuit is characterized by including a calibrating circuit for adjusting the current error signal in accordance with an amplitude of any of the sensing signals. The calibrating circuit includes a differential amplifying circuit, a rectifying circuit, a filtering circuit, and a dividing circuit.
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Citations
15 Claims
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1. A brushless motor drive device for driving a multi-phase motor, comprising:
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a current detecting circuit for generating a current detection signal representative of a motor drive current flowing through the multi-phase motor; an error determining circuit for generating a current error signal representative of a difference between a current command signal and the current detection signal; a sensing circuit for generating a plurality of sensing signals in response to variations in a magnetic field of the multi-phase motor; a signal synthesizing circuit for converting the plurality of sensing signals into a plurality of drive signals, such that an amplitude of each of the drive signals is determined in accordance with the current error signal; a comparing circuit for comparing the plurality of drive signals with a reference signal so as to generate a plurality of pulse signals; and a switching circuit coupled between a drive voltage source and the multi-phase motor and controlled by the plurality of pulse signals for driving the multi-phase motor, characterized in that; the signal synthesizing circuit includes a calibrating circuit for adjusting the current error signal in accordance with an amplitude of any of the sensing signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A brushless motor drive device for driving a multi-phase motor, comprising:
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a sensing circuit for generating a plurality of sensing signals in response to variations in a magnetic field of the multi-phase motor; a synthesizing circuit for converting the plurality of sensing signals into a plurality of drive signals, such that an amplitude of each of the drive signals is determined in accordance with a current error signal, the current error signal being representative of a difference between a current command signal and a motor drive current; a comparing circuit for comparing the plurality of drive signals with a reference signal so as to generate a plurality of pulse signals; and a switching circuit coupled between a drive voltage source and the multi-phase motor and controlled by the plurality of pulse signals for driving the multi-phase motor, characterized in that; the synthesizing circuit includes a calibrating circuit for adjusting the current error signal in accordance with an amplitude of any of the sensing signals. - View Dependent Claims (12, 13, 14, 15)
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Specification