Driver for an induction motor

Details Driver for an induction motor Driver for an induction motor

1996-03-05

1997-12-30

Ip, Paul

Electricity: motive power systems

Induction motor systems

Primary circuit control

318758, 318803, 318805, H02P 534, H02M 748

Patent

active

057034591

ABSTRACT:
A driver for an induction motor includes a voltage limiter which limits an upper limit value of an output voltage from an invertor circuit in accordance with an output frequency command, a lowest frequency limiter which limits a lower limit of an output frequency from the invertor circuit, a forward rotation limiter which outputs a first power supply interruption signal when the output frequency from the invertor circuit reaches the upper limit, a reverse rotation limiter which outputs a second power supply interruption signal when a reverse rotational speed of the motor reaches a reverse rotation limit level, and a low-speed overload detector which outputs a third power supply interruption signal when a state in which the second power supply interruption signal is not output continues in a low speed abnormality state.

REFERENCES:
patent: 4160940 (1979-07-01), Wolf
patent: 4335337 (1982-06-01), Okamatsu et al.
patent: 4477761 (1984-10-01), Wolf
patent: 4721861 (1988-01-01), Saito et al.
patent: 4777420 (1988-10-01), Dadpey et al.

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