Speed control circuit for a brushless dc motor
AssigneeSunonwealth Electric Machine Industry Co., Ltd.
InventorsAlex Horng, Ta-Lun Ko
Life of this patent
Estimating the term…
Abstract
A speed control circuit for a brushless dc motor includes a motor drive circuit, a drive member and a PWM control circuit. The motor drive circuit includes at least one coil and at least one transistor serially connected to the coil. The drive member is provided with a plurality of output terminals adapted to output a driving signal to the transistor of the motor drive circuit. The PWM control circuit is in connection between the transistor of the motor drive circuit and the output terminal of the drive member, thereby turning the transistor on or off.
Claims4
A speed control circuit for a brushless dc motor, comprising:
- a motor drive circuit including at least one coil adapted to drive the motor, and at least one transistor;
- a drive member having a plurality of output terminals adapted to send a driving signal to the transistor of the motor drive circuit for controlling operation;
- and
- a PWM control circuit electrically connected between the output terminals of the drive member and the transistor of the motor drive circuit, the PWM control circuit employing a PWM signal to control sending the driving signal of the drive member to the transistor of the motor drive circuit, thereby adjusting speed of the motor.
Dependencies are inferred from the claim text.