Controlling apparatus for induction motor

Details Controlling apparatus for induction motor Controlling apparatus for induction motor

1990-11-07

1991-06-04

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, 318805, 318721, H02P 540

Patent

active

050217240

ABSTRACT:
A controlling apparatus for an induction motor for controlling the induction motor in high efficiency having a converter for supplying an electric power to the induction motor, a rotational speed detector of the induction motor, a controlling means of the converter for holding a torque of the induction motor constant while the rotational speed of the induction motor is lower than a base rotational speed and to decrease a secondary magnetic flux of the induction motor according to the rotational speed while the rotational speed of the induction motor is over the base rotational speed, and a means for varying the secondary magnetic flux according to a terminal voltage of the induction motor so as to hold the terminal voltage a predetermined constant voltage while the rotational speed of the induction motor is higher than the predetermined speed.

REFERENCES:
patent: 4292531 (1981-09-01), Williamson
patent: 4361794 (1982-11-01), Kawada et al.
patent: 4680526 (1987-06-01), Okuyama et al.
patent: 4792741 (1988-12-01), Matsuo et al.
patent: 4818927 (1989-04-01), Hino et al.

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