Synchronous motor drive apparatus

Details Synchronous motor drive apparatus Synchronous motor drive apparatus

1983-01-25

1985-10-15

Smith, Jr., David

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

318811, 318661, H02P 540

Patent

active

045477191

ABSTRACT:
To reduce adverse effects due to a dead zone in a pulse-width modulation circuit provided for avoiding short-circuiting in an inverter circuit, distortions of sine wave currents generated when low-frequency current commands are given, sound produced due to the excitation, and torque variations, a synchronous motor drive apparatus has been provided. The apparatus comprises a current detector circuit for detecting drive currents given to the synchronous motor, a difference output circuit for producing as outputs the differences between current commands given to the synchronous motor and the detected currents, a pulse-width modulation circuit for modulating signals indicative of the differences by way of pulse-duration modulation, an inverter circuit for driving the synchronous motor, a voltage detector circuit for detecting output voltages from output terminals of the inverter circuit, and a circuit for generating the differences between output voltages from the difference output circuit and the detected output voltages, whereby the synchronous motor can be driven by the outputs from the inverter circuit which is operated by voltage command values indicating the last-mentioned differences.

REFERENCES:
patent: 3700986 (1972-10-01), Cushman et al.
patent: 3824437 (1974-07-01), Blaschke
patent: 3913001 (1975-10-01), Kayama
patent: 4172991 (1979-10-01), Akamatsu et al.
patent: 4272715 (1981-06-01), Matsumoto
patent: 4306182 (1981-12-01), Curtiss
patent: 4361794 (1982-11-01), Kawada
patent: 4364109 (1982-12-01), Okado et al.
patent: 4445167 (1984-04-01), Okado
Salzmann, T., "Cycloconverters and Automatic Control of Ring Motors Driving Tube Mills," Siemans Rev., vol. 45, No. I, 1978, pp. 3-8.

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