H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/96
H02P 27/06 (2006.01)
Patent
CA 1145390
21DSH 2534 ZERO ROTATION AND ZERO TORQUE DETECTOR AND METHOD FOR AN AC ELECTRIC MOTOR DRIVE ABSTRACT OF THE DISCLOSURE A substantially zero rotation and substantially zero torque detector and method for an AC electric motor drive system is disclosed. The 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 reference 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 device 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 respect 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 21 DSH 2534 ABSTRACT OF THE DISCLOSURE (continued) 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.
350526
Cutler John H.
Walker Loren H.
Company General Electric
Eckersley Raymond A.
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