Electricity: motive power systems – Synchronous motor systems – Synchronization systems
Patent
1984-02-15
1985-07-02
Smith, Jr., David
Electricity: motive power systems
Synchronous motor systems
Synchronization systems
318719, 318723, H02P 540
Patent
active
045271097
ABSTRACT:
A control apparatus for thyristor motor comprises a voltage detector (27), a speed detecting circuit (600) and a correction circuit (800). The voltage detector (27) detects DC voltage (E.sub.d) supplied to an inverter circuit (200). The speed detecting circuit (600) detects the rotational speed of a synchronous motor (3) and provides speed voltage (E.omega.) proportional thereto. The correction circuit (800) detects a difference between the detected DC voltage (E.sub.d) and the speed voltage (E.omega.) and provides a correction signal to an excitation circuit (700) when a difference is detected. The excitation circuit (700) corrects field current in response to the correction signal so that the DC voltage (E.sub.d) and the speed voltage may be equal. Thus, a proportional relation can be maintained between the instructed torque and the generated torque.
REFERENCES:
patent: 4172991 (1979-10-01), Akamatsu et al.
patent: 4276505 (1981-06-01), Bose
patent: 4319176 (1982-03-01), Akamatsu
Article "Commutatorless DC Drive for Steel Rolling Mill", Shinryo et al., reprinted from IEEE/IAS 1977 Annual Meeting, pp. 263-271, 1977.
Article "Utilization and Rating of Machine Commutated Inverter-Synchronous Motor Drives", John Rosa, reprinted from IEEE Trans. Ind. Appl., vol. IA-15, pp. 155-164, Mar./Apr. 1979.
Hosokawa Yasuhiko
Morishima Naoki
Mitsubishi Denki & Kabushiki Kaisha
Smith Jr. David
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