Asynchronous motor for a drive mechanism, such as hoists or running gears, with controllable rotational speed and rotational direction

US6072296A · kind A · utility

Assignee

• Mannesmann AG · DE

Inventors

• Eckerhardt Grieb · Hagen, DE
• Wolfgang Krebs · Wetter, DE
• Anton Muller · Wetter, DE
• Giuliano Persico · Wetter, DE
• Gerhard Weber · Landsberg am Lech, DE

Key dates

• Filing date: Apr 13, 1999
• Grant date: Jun 6, 2000
• Expiry date: Apr 13, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02K11/22
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

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.