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:
Nov. 19, 1996
Filed:
Dec. 16, 1994
Vinh T Nguyen Phuoc, Boulogne sur Seine, FR;
Christian Conrath, Rueil Malmaison, FR;
Schneider Electric SA, Boulogne-Billancourt, FR;
Abstract
An asynchronous motor is supplied with power from an AC line voltage via a variable speed drive including a rectifier bridge connected to the AC line voltage, a DC voltage intermediate circuit including a capacitor, and an inverter including switches controlled by a control circuit and connected to the phase windings of the motor. A cascade regulation structure includes a frequency regulator, a current limiter and a current regulator driving the control circuit. The frequency regulator input is connected to a ramp generator supplying the motor start speed and the frequency regulator output is connected to the current limiter. The output of the current limiter is connected to the current regulator. The cascade regulation structure is associated with the intermediate circuit to limit the DC voltage at the capacitor by means of the current limiter.