Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1982-03-04
1984-04-10
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318805, 324158MG, H02P 540
Patent
active
044423934
ABSTRACT:
From the sensed input voltages and currents fed into a standard induction motor the stator resistance is known instantaneously through a direct and quadrature treatment of the sensed quantities from which are derived at least four of the following five quantities: the motor overall reactance, the motor overall real impedance, the air gap reactance, the parallel combination of stator and rotor leakage reactances and the stator leakage reactance. This derivation uses the motor intrinsic characteristics at rest, while those four quantities are used in ascertaining the stator resistance instantaneously and recurrently during motor operation, thus, without any sensing means on the motor itself. The load reactance is also determined with the above-stated five quantities. From the knowledge of the stator resistance and the load resistance, a simulated two-phase network is provided and used to ascertain any of the key process variables typically used in an induction motor drive, such as shaft speed, slip, flux, torque. The temperature and load of a standard induction motor are known without sensing and the motor can be remotely controlled for protection against overheating, or overload.
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Gabriel et al., "Field Oriented Control of a Standard AC Motor Using Microprocessors", IEEE Transactions on Industry Applications, vol. IA-16, No. 2, Mar./Apr., pp. 186-192.
Walker et al., "A High Performance Controlled-Current Invertor Drive", IEEE Trans. Ind. Appl., vol. IA-I6, pp. 193-202, Mar./Apr. 1980.
Lorin C. M.
Smith Jr. David
Westinghouse Electric Corp.
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