Motor control system for centrifuge

Details Motor control system for centrifuge Motor control system for centrifuge

1996-07-30

1998-03-10

Cabeca, John W.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318376, 318801, 318269, 318758, 363 37, 363 39, H02P 326

Patent

active

057265500

ABSTRACT:
A motor control system for controlling power supplied to an electric motor rotating a rotor employed in a centrifuge is provided. The motor control system includes first, second, and third converters and first and second smoothing capacitors. In a motor power mode, the first converter operates to transfer the charged energy in the first smoothing capacitor to the second smoothing capacitor for providing power to the motor through the third converter, while the second converter transfers, in a motor braking mode, the charged energy in the second smoothing capacitor to the first smoothing capacitor to return the power regenerated by the motor during a braking operation to the AC power supply through the first converter. The second converter performs a function of providing an initial energizing energy to the motor for a given period of time at the start of the braking operation for stability of a power-regenerating operation of the motor.

REFERENCES:
patent: 4788485 (1988-11-01), Kawagishi et al.
patent: 4902954 (1990-02-01), Oshima et al.
patent: 5070290 (1991-12-01), Iwasa et al.
patent: 5175439 (1992-12-01), Harer et al.
patent: 5471125 (1995-11-01), Wu
patent: 5504667 (1996-04-01), Tanaka et al.
patent: 5631813 (1997-05-01), Ikeshita

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