Remote starting circuit and method for brushless DC motor

Details Remote starting circuit and method for brushless DC motor Remote starting circuit and method for brushless DC motor

1995-09-26

1997-07-22

Ro, Bentsu

Electricity: motive power systems

Motor load, armature current or force control during...

Initial, 'cracking' or 'starting from rest' torque control

318254, 318277, H02P 620

Patent

active

056506996

ABSTRACT:
A remote starting control circuit for a polyphase motor includes a controller, a zero-crosspoint detector, a power switch, a commutation circuit and a motor drive output circuit. The controller controls an excitation current applied to the motor. When the motor starts normally, it is accelerated in accordance with a detected zero-crosspoint. If the zero-crosspoint detector indicates that the motor has not started under optimal conditions, the controller adjusts a power-OFF interval and an excitation pulse width and re-starts the motor accordingly. Because of the ability to controllably adjust the starting of the motor under various excitation conditions, the motor can be started successfully without such problems as torque dead-point, head sticking and insufficient starting torque.

REFERENCES:
patent: 4743815 (1988-05-01), Gee et al.
patent: 4835448 (1989-05-01), Dishner et al.
patent: 4876491 (1989-10-01), Squires et al.
patent: 5221881 (1993-06-01), Cameron
patent: 5254914 (1993-10-01), Dunfield et al.

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