Electricity: motive power systems – Positional servo systems – Frequency- or phase-modulated systems
Patent
1991-11-26
1994-06-07
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Frequency- or phase-modulated systems
318807, 318810, G05B 102
Patent
active
053192958
ABSTRACT:
A digital current regulator for controlling the operation of an inductance device such as an AC motor. A plurality of independently controllable insulated gate bipolar transistors are selectively enabled to vary the instantaneous phase and magnitude of current applied to an AC motor. To minimize induced back EMFs during current switching operations, a number of safeguards are utilized. Switching between adjacent states only is provided to minimize the magnitude of instantaneous current changes. A "ready blocking" function limits the maximum switching frequency to avoid significantly derating the switching device capabilities, while a "time out" feature assures system operation above at least a minimum switching frequency to further minimize the magnitude of instantaneous current changes. A time hysteresis function is provided to avoid switching device response to false feedback control signals.
REFERENCES:
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patent: 3886430 (1975-05-01), Meier
patent: 3886431 (1975-05-01), Meier
patent: 4673859 (1987-06-01), Shero
patent: 5032780 (1991-07-01), Hopkins
"Control Strategies for Direct Torque Control Using Descrete Pulse Modulation", T. G. Habetler, D. M. Divan; pp. 514-522; IEEE 1989.
"Performance Characterization of a New Discrete Pulse Modulated Current Regulator", T. G. Habetler, D. M. Divan; pp. 395-405; IEEE 1988.
Hammel William S.
Pai Ramdas M.
Van Patten Keith
Martin D.
Shoop Jr. William M.
Unico, Inc.
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