Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1996-01-11
1997-12-23
Martin, David S.
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318254, 318705, 318712, H02P 146
Patent
active
057010650
ABSTRACT:
In a novel method and apparatus for controlling a synchronous motor, an angular position transducer, in whose output winding three-phase voltages with amplitude variations of N (N: an integer of 1 or more) cycles per revolution is induced, is directly coupled to a synchronous motor with 2N poles so that the demodulated a-phase voltage of the transducer has its positive peak value multiplied by the cosine of a selected angle as MMF phase angle when a direct axis of the motor is located in the position of its a-phase winding axis. The instructions to control three-phase currents of an inverter feeding the motor are produced by multiplying the current phase instructions by the amplitude instruction. The former is directly obtained using the three-phase voltages demodulated from the output of the transducer and the latter is derived from the detected speed deviation or torque instruction. A changeover device is used for the current phase instruction to produce the reverse torque necessary in the four-quadrant drive of synchronous reluctance motors and interior permanent magnet synchronous motors. Although the latter is the same as the conventional method, the former simplifies the apparatus because of analog processing not using expensive R/D converters. Therefore, the present invention is effective to reduce costs and to increase reliability of the control apparatus synchronous motors.
REFERENCES:
patent: 3696277 (1972-10-01), Liska et al.
patent: 4344023 (1982-08-01), Yokobori et al.
patent: 4678973 (1987-07-01), Elliott et al.
patent: 4712050 (1987-12-01), Nagasawa et al.
patent: 5006768 (1991-04-01), Rozman
patent: 5155419 (1992-10-01), Naito
patent: 5481166 (1996-01-01), Moreira
patent: 5486743 (1996-01-01), Nagai
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