Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control
Patent
1977-03-16
1978-05-09
Hohauser, Herman J.
Electricity: motive power systems
Reciprocating or oscillating motor
Energizing winding circuit control
318176, 318175, H02K 2900
Patent
active
040889327
ABSTRACT:
A control system for a commutatorless motor, comprising a synchronous motor having a polyphase armature winding and a field winding; a frequency converter for supplying the armature winding with alternating current having a variable frequency; an angular position detector for detecting the angular position signal corresponding to the angular position of the rotor of the synchronous motor; a speed control circuit for delivering a current reference signal having an amplitude corresponding to the deviation of the actual speed of the synchronous speed from the reference speed; a current control circuit for controlling the amplitude of the output current of the frequency converter in accordance with the current reference signal and for maintaining the amplitude of the output current of the frequency converter constant in the range where the torque reference signal assumes a value smaller than the intermittent threshold of the armature current; and a phase control circuit for controlling the phase of the output current of the frequency converter in accordance with the angular position signal and for rendering the phase of the output current of the frequency converter variable in accordance with the current reference signal in the region where the torque reference signal takes a value smaller than the intermittent threshold of the armature current.
REFERENCES:
patent: 3354368 (1967-11-01), Williamson
patent: 3949283 (1976-04-01), Okuyama et al.
patent: 3997824 (1976-12-01), Miyasita et al.
Kubota Yuzuru
Okuyama Toshiaki
Hitachi , Ltd.
Hohauser Herman J.
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