Method of and circuit for starting sensorless motor

Details Method of and circuit for starting sensorless motor Method of and circuit for starting sensorless motor

1991-06-28

1993-08-10

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

318696, 318138, H02P 540

Patent

active

052352641

ABSTRACT:
A driving control circuit of a motor having a sensorless stator and a rotor, used for a magnetic disk device, comprising a high-frequency stepping oscillator, stepping oscillator, a timer, a stepping timing generating circuit, a current switching logic, an output driver, and a counter electromotive force detecting circuit, wherein three-phase driving coils are connected to an output driver. For starting, a holding step where current flow conditions are held without switching currents to the driving coils, are executed; then, currents to the driving coils are inverted to obtain a reversed excited condition, and, after performing a stepping step for starting, the motor is controlled at a steady rotating speed by detecting counter electromotive forces.

REFERENCES:
patent: 4499408 (1985-02-01), Bitting et al.
patent: 4710691 (1987-12-01), Bergstrom
patent: 4874993 (1989-10-01), Tanaka et al.
patent: 4876491 (1989-10-01), Squires et al.
patent: 5001405 (1991-03-01), Cassat
patent: 5019756 (1991-05-01), Schwarz

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