Digital acoustic noise reduction in electric motors driven by sw

Details Digital acoustic noise reduction in electric motors driven by sw Digital acoustic noise reduction in electric motors driven by sw

1995-06-07

1998-01-27

Ip, Paul

Electricity: motive power systems

With particular motor-driven load device

Tension-maintaining type of motor-control system

318254, 318364, H02P 600, H02P 701, B65H 5938

Patent

active

057125392

ABSTRACT:
A system and method is provided for controlling a brushless DC motor (100), the motor being of the type having a plurality of coils (25, 26, 27) and a switching amplifier coil driving circuit (25A, 26A, 27A) including a plurality of transistors (21, 22, 29, 30, 33, 34). Current application to the plurality of transistors is controlled to obtain, near a commutation point of the motor, a simultaneous rise in current applied to a first of the transistors and a fall in current applied to a second of the transistors. Controlling application of current to the plurality of transistors involves, for each of the transistors, generating a PWM gate drive signal by selectively switching between a nominal PWM signal and a constant signal. The selective switching is in response to a synthesized state signal, the synthesized state signal being generated to alternate variably between the two states in accordance with a desired ramping of current to the first and second transistors. In one embodiment, the control system is employed for a motor used to rotate a reel of a helical scan tape drive.

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