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

1994-07-13

1995-06-27

Cabeca, John W.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318138, 318696, 318254, H02P 736

Patent

active

054282845

ABSTRACT:
A driving control circuit of a sensorless motor having a 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 high frequency stepping step 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.

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Drive Method for Torque-up of Sensorless Motor (Jun. 1990) vol. 16, pp. 470-472, IBM Tech. Disc. Bulletin.
Multilevel Tuned Torque Amplification Routine (Aug. 1990), vol. 33, No. 3A, pp. 215-218, IBM Tech. Disc. Bul.

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