Variable speed controller for an AC motor

Details Variable speed controller for an AC motor Variable speed controller for an AC motor

1997-06-09

1999-01-12

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318804, 318805, H02P 2100, H02P 540

Patent

active

058595210

ABSTRACT:
To provide a trans-vector controller for an alternating current ("AC") motor that facilitates operating the secondary resistance of the AC motor without experimentally rotating the AC motor.
In a preferred embodiment, the variable speed control circuit, including a secondary resistance value generating device, changes the direct current ("DC") exciting current and operates the secondary resistance of an induction motor by superimposing an AC signal with small amplitude outputted from a AC signal generator onto a reference current value immediately before the start of the induction motor in the state of DC excitation.

REFERENCES:
patent: 5532570 (1996-07-01), Tajima et al.
patent: 5734251 (1998-03-01), Tajima et al.

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