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. 18, 1995
Filed:
Jun. 22, 1993
Rene Jeanneret, Merzlingen, CH;
SMH Management Services AG, Biel, CH;
Abstract
A control device for an asynchronous motor (2), notably intended for the drive system of an electric vehicle, comprises electric supply source (10) able to produce an AC supply voltage whose frequency (FAL) and amplitude (UAL) may be adjusted independently of one another. For a given frequency of the supply voltage, the amplitude of the voltage is able to vary between a minimum value and a maximum value, the difference between the frequency of rotation of the turning magnetic field in the vicinity of the rotor and the frequency of rotation of the rotor being maintained substantially constant as long as the amplitude of the supply voltage is less than the maximum value. Once the maximum value has been reached, the torque on the shaft of motor (2) is increased by increasing the slip.