Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1979-04-24
1981-09-01
Truhe, J. V.
Electricity: motive power systems
Induction motor systems
Primary circuit control
363 37, 363 58, 318798, H02P 500
Patent
active
042874637
ABSTRACT:
A substantially zero rotation and substantially zero torque detector and method for an AC electric motor drive system includes an AC electric motor producing a rotation in response to an outgoing signal, e.g., drive current, of variable magnitude and frequency. An actual rotation signal is generated and is proportional to the rotation of the AC electric motor or to the frequency of the outgoing signal. A rotation reference signal proportional to a desired level of rotation is established. A rotation difference signal representative of any difference between the rotation reference signal and the actual rotational signal is generated. A torque command signal is provided as a function of the rotation difference signal and is used to produce a frequency control signal and a current control signal. Alternatively, the torque command signal is generated proportional to a desired level of torque when the drive system utilizes a desired torque level as opposed to a desired rotation level. The outgoing signal, for example, the drive current, is supplied to the motor at a frequency controlled in response to the frequency control signal and at a magnitude varied in accordance with the current control signal. In the case of a drive system utilizing a desired level of rotation, the substantially zero rotation and substantially zero torque detector and method furnishes an idle control signal when the torque command signal and at least two of the rotation reference signal, the actual rotation signal, and the rotation difference signal are less than respective predetermined values. Alternatively, in the case of a drive system utilizing a desired level of torque, the substantially zero rotation and substantially zero torque detector and method furnishes an idle control signal when the actual rotation signal and the torque reference signal are less than respective predetermined values. In either case, the idle control signal is effective to control an operation parameter or function of the drive system and indicates when the drive system is in the substantially zero rotation and substantially zero torque mode.
REFERENCES:
patent: 3852656 (1974-12-01), Bourbeau
patent: 4151586 (1979-04-01), Udvardi-Lakos
patent: 4208691 (1980-06-01), Rogowsky
patent: 4237531 (1980-12-01), Cutler et al.
Cutler John H.
Walker Loren H.
Conklin John B.
General Electric Company
Renner Arnold E.
Truhe J. V.
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