Current supply controller for an electric motor

Details Current supply controller for an electric motor Current supply controller for an electric motor

1999-03-30

2000-08-08

Ip, Paul

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

318434, 318472, 318471, 361 24, 361 25, 361103, H02H 708

Patent

active

061006602

ABSTRACT:
A temperature sensor is located close to each of a plurality of switching elements. Each of the elements opens and closes a current supplying line from a power supply to a three phase SR motor. A generating circuit of a instruction value for the driving current of the motor generates a target value (It) of the driving current so as to achieve a requested power of the motor and an allowable value of the driving current on the basis of the highest temperature sensed by the temperature sensors. The circuit outputs the target value as an instruction value of the driving current when the target value is smaller than the allowable value and outputs the allowable value as an instruction value of the driving current when the target value is greater than the allowable value.

REFERENCES:
patent: 4644239 (1987-02-01), Yoshikawa et al.
patent: 4982143 (1991-01-01), Gerschner et al.
patent: 5898557 (1999-04-01), Baba et al.
patent: 5936820 (1999-08-01), Umemura et al.

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