Control method of pulse width modulation inverter and pulse widt

Details Control method of pulse width modulation inverter and pulse widt Control method of pulse width modulation inverter and pulse widt

1989-11-28

1991-10-01

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318803, 318798, H02P 540

Patent

active

050536907

ABSTRACT:
In spatial vector control of a pulse width modulation (PWM) inverter adapted for variable speed drive of an induction motor, a difference vector between magnetic flux vectors occurring during adjacent sampling periods is generated by synthesizing a zero vector and voltage vectors in such a manner that a resultant voltage vector always includes as a component a minimum unit of a zero vector or a voltage vector, whereby even when the angular speed of rotation of the magnetic flux changes, the switching frequency of the PWM inverter is prevented from decreasing and the current ripple is reduced.

REFERENCES:
patent: 4388577 (1983-06-01), Blaschke et al.
patent: 4458192 (1984-07-01), Sakamoto et al.
patent: 4509003 (1985-04-01), Ohnishi et al.
patent: 4510430 (1985-04-01), Ashikaga et al.
patent: 4567419 (1986-01-01), Watanabe
patent: 4617675 (1986-10-01), Ashikaga et al.
patent: 4680525 (1987-07-01), Kobari et al.
patent: 4904920 (1990-02-01), Rufer
Elektronik, vol. 36, No. 19, Sep. 18, 1987, pp. 111-117, Drehstrommotor von ASIC gesteuert.

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