Method for starting a motor

Details Method for starting a motor Method for starting a motor

1991-06-07

1993-03-02

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318431, H02P 118

Patent

active

051912708

ABSTRACT:
A method for starting a polyphase motor of the type having a plurality of stator coils and a rotor includes the steps of measuring the rise time of current on each of the stator coils, determining from the rise time measurement the position of the rotor, and determining a coil to apply a voltage to produce maximum startup torque of the motor. Any position ambiguities are resolved by determining the direction of rotation of the motor by applying a voltage to the determined coil sufficient to produce at least a slight rotation of the rotor, remeasuring of the rise time of current on at least a plurality of the rotor coils, and determining a difference between the rise time measurement and remeasurement. The difference indicates the direction which the rotor was rotated.

REFERENCES:
patent: 4992710 (1991-02-01), Cassat
patent: 5001405 (1991-03-01), Cassat
patent: 5012166 (1991-04-01), Ushijima et al.
patent: 5028852 (1991-07-01), Dunfield
patent: 5036264 (1991-07-01), Ueki
patent: 5043643 (1991-08-01), Hedlund et al.

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