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:
Jun. 06, 2000
Filed:
Apr. 13, 1999
Eckerhardt Grieb, Hagen, DE;
Wolfgang Krebs, Wetter, DE;
Anton Muller, Wetter, DE;
Giuliano Persico, Wetter, DE;
Gerhard Weber, Breckerfeld, DE;
Mannesmann AG, Dusseldorf, DE;
Abstract
An asynchronous motor for a drive mechanism, in particular a hoist or a running gear includes a motor housing with opposite end faces covered by respective end shields, and an annular short-circuit winding disposed on a motor shaft. An asynchronous motor of this type is compact and inexpensive to manufacture and can be reliably controlled even in the presence of a rear-mounted magnetic brake, by accommodating in the motor housing at least two sensor units which are arranged sequentially in the direction of rotation of the motor at the rear of the motor housing, with each sensor unit including an opto-electronic receiver and a confronting electro-optic transmitter. Secured in the motor housing on the motor shaft between the short-circuit winding and the rear end shield is a circular rotary disk which includes modulation elements for interaction with the sensor units, by modulating the intensity of optical output signals produced by the electro-optic transmitter when the modulation elements pass by the respective sensor unit. The associated receiver transforms the modulated intensity of the optical output signals for formation of at least one electric motor control signal.