Apparatus for controlling AC servo motor

Details Apparatus for controlling AC servo motor Apparatus for controlling AC servo motor

1986-12-09

1990-04-03

Smith, Jr., David

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

318798, H02P 540

Patent

active

049143719

ABSTRACT:
In apparatus for controlling the rotational speed of a synchronous motor arranged to be driven by an inverter having switches for selectively energizing respective windings of the motor, a current detector is provided to an input of the inverter for detecting input current to the inverter to thereby interrupt energization of the switches by using an output of a first timer circuit when the current exceeds a predetermined value, and a second timer circuit is provided for interrupting energization of the switches on switching between respective phases of the motor. An interrupting time duration by the second timer circuit may be varied in accordance with the rotational speed of the motor and by the plugging state thereof.

REFERENCES:
patent: 3387205 (1968-06-01), Tesdall
patent: 3694718 (1972-09-01), Graf et al.
patent: 3775651 (1973-11-01), Graf et al.
patent: 4547719 (1985-10-01), Sakamoto et al.
patent: 4620272 (1986-10-01), Fulton et al.
patent: 4672286 (1987-06-01), Williams

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