Mannesmann Aktiengesellschaft

Anton Muller

Giuliano Persico

Wolfgang Krebs

Holger Freitag

Anton Munzebrock

Eckerhardt Grieb

Gerhard Weber

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.

Asynchronous motor for a drive mechanism, such as hoists or running

An electric hoist with motor-speed-regulated lifting speed, in particular an electric chain hoist, including an electric motor, a gear unit, and a wheel around which the hoisting chain is looped. A load-carrying device is arranged on the hoisting chain. The motor, gear unit and wheel are connected with one another in a drive connection and the lifting speed is provided by an electric control unit for the electric motor, which control unit is connected to a manual control switch. In order to achieve suitable cooling while apportioning the space in an appropriate manner for the arrangement of all required components, the electric control unit, which has control electronics with speed sensing equipment, is arranged in an external protective housing fitted to the gear box.

Electric hoist with speed control, a protective housing and a swivelable

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Wetter, Germany

Anton Muller