Commutatorless motor device

Details Commutatorless motor device Commutatorless motor device

1978-10-17

1981-04-28

Truhe, J. V.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318723, 318803, H02P 742

Patent

active

042648530

ABSTRACT:
In a commutatorless motor device including a synchronous motor driven through a frequency converter including gate-controlled electric valves, and a device for detecting the phase voltages of the synchronous motor, there is a device for multiplying a signal corresponding to a stator current of the synchronous motor with the detected phase voltages. The output signal of the multiplying device is added to the output signal of the phase voltage detecting device, and the sums are passed through a logic circuit and a gate-pulse generating circuit for generating gate pulses for controlling the electric valves of the frequency converter.

REFERENCES:
patent: 3546551 (1970-12-01), Risberg et al.
patent: 3796935 (1974-03-01), Blaschke
patent: 3872364 (1975-03-01), Hubner
patent: 4186334 (1980-01-01), Hirata
"Operational Characteristics of thyristor-motor with a controlled advance angle" by Hiroshi Nagase et al. Apr., 1978.
"Method for controlling a commutatorless motor of induced voltage commutation type under a constant margin angle . . . " by Yoki Takeda et al., Apr., 1978.

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