Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1983-05-17
1984-11-13
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318867, 318808, H02P 540
Patent
active
044828551
ABSTRACT:
A current control apparatus includes an instructor for providing a DC amplitude instruction and an AC phase instruction, and a cycloconverter for supplying an induction motor with AC load currents. These load currents are detected by sensors. The sensed signals from the sensors are applied to a detector. The detector generates a DC phase error signal and a DC amplitude signal according to the load currents and the phase instruction. The amplitude instruction, amplitude signal and phase error signal are applied to a comparator circuit. The comparator circuit generates a first voltage instruction and a second voltage instruction. These first and second voltage instructions are applied to a control circuit. The control circuit supplies the cycloconverter with voltage instructions. The comparator circuit, control circuit, cycloconverter, sensors and detector constitute a closed DC feedback control loop which utilizes a vector control method.
REFERENCES:
patent: 3824437 (1974-07-01), Blaschke
patent: 4384244 (1983-05-01), Matsumoto et al.
IEEE IAS Annual Meeting (1980), Nakajima et al., "Reactive Power Reduced Cycloconverter with Bias Voltage at the Neutral Point," pp. 785-790.
IEEE IAS Annual Meeting IAS81=26A pp. 592-599, Oct. 1981 issued by C. D. Schauder, R. Caddy.
Otsuka Kenichi
Shimamura Takeo
Smith Jr. David
Tokyo Shibaura Denki Kabushiki Kaisha
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