Ac motor controlling apparatus

Details Ac motor controlling apparatus Ac motor controlling apparatus

1997-07-30

1998-11-10

Ro, Bentsu

Electricity: motive power systems

Battery-fed motor systems

318801, 318811, 318432, B60L 916

Patent

active

058349103

ABSTRACT:
An AC motor controlling apparatus which can exactly control the torque of an AC motor throughout a motor rotating speed range from low to high.
A control mode selecting circuit 13 actuates a switching circuit 19 for allowing an exciting circuit 12 to receive a PWM signal S11 from a current feedback circuit 11 when the rotating speed Nm of the motor 1 is in a higher range, and a PWM signal from an AND gate 14 when it is in a lower range. A power feedback circuit 10 performs a feedback control for matching the power supplied to an inverter circuit 6 to a target power. The current feedback circuit 11 performs a feedback control for matching the phase currents to a target currents.

REFERENCES:
patent: 4335337 (1982-06-01), Okamatsu et al.
patent: 4338558 (1982-07-01), Okamatsu et al.
patent: 5227703 (1993-07-01), Boothe et al.
patent: 5442268 (1995-08-01), Goodarzi et al.
patent: 5686807 (1997-11-01), Kusano et al.

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