Motor/brake transitioning for an inverter driven a-c induction m

Details Motor/brake transitioning for an inverter driven a-c induction m Motor/brake transitioning for an inverter driven a-c induction m

1978-10-02

1980-07-29

Rubinson, Gene Z.

Electricity: motive power systems

Induction motor systems

Braking

318803, 318808, H02P 540

Patent

active

042153042

ABSTRACT:
Dynamic response of an a-c induction motor control system including an adjustable frequency and adjustable magnitude power source is made more stable during the transition from a motoring to an electrical braking mode by modifying the system characteristics as a function of rate of change of motor flux and torque magnitude during electrical braking. The control system responds to a torque command signal and a torque feedback signal to generate an error signal which controls the frequency of the excitation supplied to the motor and thus the torque developed by the motor. During electrical braking this error signal is modified as a direct function of the rate of change of motor flux and as an inverse function of the magnitude of torque developed by the motor. During the transition from motoring to electrical braking, when the system tends to be unstable, the rate of change of flux is relatively high while the motor torque is at a relatively low value. Accordingly, the error signal becomes very large in magnitude and rapidly forces the control system and motor out of the transition zone into a more stable operating zone. Once stabilized, modification of the error signal becomes negligible.

REFERENCES:
patent: 3899725 (1975-08-01), Plunkett
patent: 4088934 (1978-05-01), D'Atre et al.

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