Motor drive device and drive method
First Claim
1. A motor drive device operable to supply drive power to a motor to drive the motor, comprising:
- a drive signal generator operable to generate a drive signal;
a driver operable to produce the drive power based on the drive signal;
a torque control signal generator operable to generate a torque control signal specifying the motor torque;
a speed detector operable to detect the rotational speed of the motor and to generate a rotational speed signal denoting motor speed information; and
a speed difference detector operable to generate a first speed difference detection signal if the rotational speed signal is greater than the torque control signal and a second speed difference detection signal if the rotational speed signal is less than the torque control signal;
wherein said drive signal generator is controlled based on the first and second speed difference detection signals.
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Accused Products
Abstract
A rise in the power supply voltage as a result of a sudden speed reducing command causing the motor current to flow to the power supply is prevented. The motor drive device has a drive signal generating unit for generating a drive signal by an energizing control unit, PWM control unit, and oscillation unit; a drive unit for producing drive power to drive the motor based on the drive signal; a torque control signal generating unit for generating a torque control signal specifying the motor torque; a speed detection unit for detecting the rotational speed of the motor and generating a rotational speed signal denoting motor speed information; and a decision unit for generating a speed difference detection signal denoting the difference between the torque control signal and the rotational speed signal. The drive signal generating unit is controlled based on the speed difference detection signal.
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Citations
9 Claims
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1. A motor drive device operable to supply drive power to a motor to drive the motor, comprising:
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a drive signal generator operable to generate a drive signal; a driver operable to produce the drive power based on the drive signal; a torque control signal generator operable to generate a torque control signal specifying the motor torque; a speed detector operable to detect the rotational speed of the motor and to generate a rotational speed signal denoting motor speed information; and a speed difference detector operable to generate a first speed difference detection signal if the rotational speed signal is greater than the torque control signal and a second speed difference detection signal if the rotational speed signal is less than the torque control signal; wherein said drive signal generator is controlled based on the first and second speed difference detection signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A motor drive method for supplying drive power to a motor and to drive a motor, the drive method comprising:
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generating a drive signal; producing the drive power based on the drive signal; generating a torque control signal specifying the motor torque; detecting the rotational speed of the motor and generating a rotational speed signal denoting motor speed information; generating a first speed difference detection signal if the rotational speed signal is greater than the torque control signal and a second speed difference detection signal if the rotational speed signal is less than the torque control signal; and controlling the drive signal based on the first and second speed difference detection signals.
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Specification