Method of starting a sensorless motor

Details Method of starting a sensorless motor Method of starting a sensorless motor

1993-11-30

1996-09-10

Cabeca, John W.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318685, 318603, G05B 1114

Patent

active

055549160

ABSTRACT:
A method of starting a sensorless motor comprising a stator provided with three-phase stator coils to which an exciting current is supplied, and a rotor provided with a rotor magnet for obtaining a rotating torque by the electromagnetic interaction of the stator wherein a first stepping step and a second stepping step for starting the rotor at the time of starting the motor are carried out. In the early period of the second stepping step, a reverse exciting operation is carried out in which an exciting current is switched off from positive to negative or from negative to positive without including a cessation period in two-phase coils out of the three-phase stator coils.

REFERENCES:
patent: 4259698 (1981-03-01), Takada
patent: 4631657 (1986-12-01), Hill et al.
patent: 4876491 (1989-10-01), Squires et al.
patent: 4928043 (1990-05-01), Plunkett
patent: 5019756 (1991-05-01), Schwarz
patent: 5235264 (1993-08-01), Kaneda et al.
patent: 5396159 (1995-03-01), Kaneda

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