Motor control circuit

摘要

To provide a motor control circuit that variably controls the speed of a motor, in which an appropriate advance angle value corresponding to the speed of the motor that is set can be automatically set. The motor control circuit according to the present invention includes an advance angle setting means that adds a reference advance angle value to an advance angle correction value obtained by multiplying a proportional coefficient by a correction amount and outputs an advance angle setting signal, and an advance angle setting correction means that uses a ratio of a correction reference period relative to a period of a reference signal input from the outside as a correction amount and corrects the reference advance angle value by an advance angle correction value obtained by multiplying the correction amount by a predetermined proportional coefficient of the advance angle setting means.

主权项

1. 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: an advance angle setting means that adds an advance angle correction value obtained by multiplying a proportional coefficient by a correction amount to a reference advance angle value so as to output an advance angle setting signal; and an advance angle setting correction means that uses a ratio of a correction reference period relative to the period of the reference signal as the correction amount and multiplies the proportional coefficient by the correction amount so as to obtain the advance angle correction value.