Start-up system for a synchronous motor drive

Details Start-up system for a synchronous motor drive Start-up system for a synchronous motor drive

1987-02-12

1988-05-24

Smith, Jr., David

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

324158MG, 318778, H02P 540

Patent

active

047468505

ABSTRACT:
In a load commutated inverter (LCI) motor drive, the motor is started from a rotor rest position by modulating the rotor winding with a field current at a constant rate to induce stator voltages which are detected in terms of signs, so as to identify the rotor rest position. The induced stator voltages are used to select an initial pair of thyristors of the inverter to be turned on in the firing sequence for the chosen direction of rotation under normal operation of the drive.

REFERENCES:
patent: 3909688 (1975-09-01), Blaschke et al.
Davoine et al., "Operation of a Self-Controlled Synchronous Motor Without a Shaft Position Sensor", IEEE Trans. on Industry Applications, vol. IA-19, No. 2, Mar./Apr. 1983, pp. 217-223.
Jansch et al., "Measuring and Recording The Load Angle of Synchronous Machines," Journal of Physics: E Scienti Instruments, 1971, vol. 4., G. B., pp. 43-45.

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