Drive arrangement, especially for a hoist mechanism

Details Drive arrangement, especially for a hoist mechanism Drive arrangement, especially for a hoist mechanism

1990-03-05

1991-02-19

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

318757, 318771, 318808, H02P 528, H02P 540

Patent

active

049947257

ABSTRACT:
The drive arrangement suitable especially for a hoist mechanism comprises a pole-changing two-speed three-phase motor which is united into one construction unit with a friction brake which can be released by an electromagnet. The two three-phase field windings dimensioned for different pole numbers are connected in star circuit arrangement and have star points conducted out at the motor terminal box of the three-phase motor. The electromagnet of the friction brake is connected through a rectifier circuit arrangement to the star points and when the three-phase motor is switched on is energized by the differential voltage then occurring between the two star points for the release of the friction brake. The rectifier circuit arrangement is accommodated, together with a controllable switch likewise connected to the two star points in the motor terminal box, while the switch path of the controllable switch simultaneously short-circuits the electromagnet on the direct current side, in the switching off of the three-phase motor. The friction brake of the drive arrangement in this way can be controlled from a remotely situated switch or control box containing a direction contactor and a speed contactor, without additional connecting leads being necessary for this purpose beyond the connecting leads in any case necessary for the operation of the three-phase motor.
The arrangement is also suitable in corresponding manner for delta-connection three-phase motors.

REFERENCES:
patent: 4110669 (1978-08-01), Akamatsu
patent: 4160938 (1979-07-01), Akamatsu
patent: 4761602 (1988-08-01), Leibovich
patent: 4916376 (1990-04-01), Kume et al.
Conti Elektro Berichte Apr./Jun. 1960, p. 79.

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