SENSORLESS DRIVE DEVICE, CONTROL METHOD AND PROGRAM FOR BRUSHLESS DC MOTOR

摘要

The purpose of the present invention is to reduce noise by controlling vibration due to rotation fluctuation, and to consume only current required for maintaining the rotation by bringing the current for driving a motor closer to a state of synchronization. A drive means drives a sensorless brushless DC motor by switching an energization pattern at a constant frequency to determine the rotation position of the rotor of the sensorless brushless DC motor. A detection means detects a zero-cross signal representing the switching of the phase of the rotor. A calculation means calculates a synchronization determination rate representing a percentage of the number of detected zero-cross signals. A pulse width control means controls the pulse width of a PWM drive duty in the drive means so that the calculated synchronization determination rate falls within a target range.

主权项

1. A drive device comprising:
drive means that drives a sensorless brushless DC motor by alternating, with a constant cycle, an energizing pattern for determining a rotation position of a rotor of the sensorless brushless DC motor; detection means that detects a zero-cross signal indicating alternation of a phase of the rotor; calculation means that calculates a synchronization determination rate indicating a ratio of the number of detected zero-cross signals; and PWM (Pulse Width Modulation) drive duty pulse width control means that controls a pulse width of a PWM drive duty of the drive means so that the calculated synchronization determination rate is in a target range.