Motor control circuit
AssigneesMinebea Co., Ltd., Panasonic Corporation
InventorsTomohiro Inoue, Kenichi Kishimoto, Yuji Hamada
Life of this patent
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Abstract
To provide a motor control circuit that variably controls the speed of a motor, in which an appropriate control gain corresponding to the speed of the motor that is set can be automatically set. The motor control circuit includes a period error signal output means, a speed error signal output means and a gain correction means.
Claims6
A motor control circuit in which a detection signal of a frequency that is proportional to a speed of a motor is input from a speed detection means attached to the motor, a reference signal having a frequency corresponding to a target speed is input from outside, and a period of the detection signal and a period of the reference signal are compared to variably control a speed of the motor,
- the motor control circuit comprising:
- a period error signal output means that outputs a period error signal corresponding to a difference between the period of the detection signal and the period of the reference signal;
- a speed error signal output means that outputs a speed error signal obtained by multiplying the period error signal by a speed gain;
- and
- a gain correction means that uses a ratio of a correction reference period relative to the period of the reference signal as a correction amount, and squares the correction amount and multiplies it by a predetermined speed gain of the speed error signal output means to correct the predetermined speed gain.
Dependencies are inferred from the claim text.