The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 1984
Filed:
Mar. 04, 1982
Alberto Abbondanti, Penn Hills, PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
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.