AIR BLOWER EQUIPPED WITH BRUSHLESS DC MOTOR

摘要

Air blower equipped with a brushless DC motor includes an inverter circuit, a drive logic controller, a duty indicator, a motor voltage detector, a motor current detector, and a correlation detector. A duty indicating value of the duty indicator is determined according to a value of the correlation detector.

主权项

1. An air blower equipped with a brushless DC motor comprising:
an inverter circuit including a plurality of upper stage side switching elements and a plurality of lower stage side switching elements connected to form a bridge; a drive logic controller configured to perform PWM control of the upper stage side switching elements or the lower stage side switching elements, and control a DC voltage applied to the inverter circuit by energizing driving coils of the brushless DC motor sequentially in a specified direction and order; a duty indicator configured to indicate ON/OFF duty of the PWM control; a motor voltage detector configured to detect a voltage applied to the driving coils; a motor current detector configured to detect a current flowing through the driving coils; and a correlation detector configured to compare an output value of the motor voltage detector with an output value of the motor current detector, wherein a duty indicating value of the duty indicator is determined according to a value of the correlation detector.