DC/AC inverter for power supply to an electrical motor for the t

Details DC/AC inverter for power supply to an electrical motor for the t DC/AC inverter for power supply to an electrical motor for the t

1997-01-27

1998-12-22

Shoop, Jr., William M.

Electricity: motive power systems

Synchronous motor systems

Field winding circuits

318439, 318138, 318254, 318798, H02P 146

Patent

active

058523561

ABSTRACT:
Disclosed is a dc/ac inverter for the supply of alternating current to the windings of a synchronous electrical motor, especially for the traction of an electrical vehicle. During each half-wave of the alternating current, the dc/ac inverter with solid-state switches delivers steady levels of constant intensity. During each steady level, the intensity of the current is determined by the cyclical ratio of a chopping signal that controls the conduction of the transistor-based or thyristor-based switches. At zero speed of the rotor, the frequency f of the chopping signal has a value (f', 1 khz) smaller than the chopping frequency (8 kHz) for a speed different from zero. Thus the starting losses or the losses with the rotor off are minimized.

REFERENCES:
patent: 4694386 (1987-09-01), De Sartre
patent: 5517095 (1996-05-01), Carobolante et al.

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