Electricity: motive power systems – Synchronous motor systems – Armature winding circuits
Patent
1984-08-27
1986-12-30
Smith, Jr., David
Electricity: motive power systems
Synchronous motor systems
Armature winding circuits
318702, 318722, H02P 540
Patent
active
046331573
ABSTRACT:
This disclosure relates to a system for stabilizing a permanent magnet synchronous motor that does not have a rotor starting cage or windings. The system includes a dc source, an inverter connected to the dc source for converting the dc to a multi-phase ac, and an ac synchronous motor connected to receive the multi-phase ac, the motor being constructed without a starting cage or winding. The system further includes means for sensing variations in the motor power angle, and a control circuit connected to respond to the variations and to cause the inverter output to vary such as to generate an ac component of torque that leads in phase the power angle variations at the natural frequency of the rotor of the motor. The inverter output may be varied by modulating the applied frequency, the dc bus current to the inverter, or the inverter phase angle.
REFERENCES:
patent: 3546551 (1970-12-01), Risberg et al.
patent: 3753063 (1973-08-01), Graf
patent: 3935518 (1976-01-01), Yusuk et al.
patent: 4112339 (1978-09-01), Lipo
patent: 4511834 (1985-04-01), Studmann
Murphy, J. M. D., Thyristor Control of A.C. Motors, Pergamon Press, 1973, pp. 101-103.
Franklin Electric Co. Inc.
Smith Jr. David
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