Brushless DC motor speed controller

Details Brushless DC motor speed controller Brushless DC motor speed controller

1994-12-14

1996-10-08

Martin, David S.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388815, 388906, 388908, 388911, 318609, H02P 517

Patent

active

055639801

ABSTRACT:
Provided is a brushless DC motor speed controller in which the speed feedback signal needed for speed control is obtained from the commutation signals generated by the magnetic-pole sensor in the brushless DC motor. The-brushless DC motor speed controller includes an edge detector, which generates a pulse each time a rising or falling edge is detected in the signal from the magnetic-pole sensor of the brushless DC motor. A frequency multiplier is used to multiply the frequency of the pulse train from said edge detector. A frequency-to-voltage converter is used to convert the output pulse train from said frequency multiplier into a positive analog voltage, with the level of the positive analog voltage being in proportion to the speed of the brushless DC motor. A motor rotating direction detecting circuit receives the output signal from said magnetic-pole sensor and thereby detects in which direction the brushless DC motor currently rotates. A feedback signal polarity analog multiplexer receives the positive analog voltage from the frequency-to-voltage converter, responsive to the rotating direction detected by said motor rotating direction detecting circuit, thereby generating a positive or a negative analog voltage as speed feedback signal. A speed compensator receives a speed command input and the speed feedback signal and thereby controls the level of the DC voltage supplied to the brushless DC motor.

REFERENCES:
patent: 3970931 (1976-07-01), Novak
patent: 4227126 (1980-10-01), Denecke
patent: 4562549 (1985-12-01), Tanaka et al.

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