DE1062798B - Device for achieving the correct direction of rotation of a three-phase motor for hoists - Google Patents

Description

GERMAN

There are limit switches known in which the motor current is passed through another switch, the if the phase connection of the drive is incorrect, it will de-energize it.

All of these limit switches have the disadvantage that the S drive of the hoist is shut down and only then can be put back into operation if the phase connection has been reconnected in this way by a specialist is that the three-phase motor receives the correct direction of rotation. In any case, costly ones occur Loss of time, especially if skilled workers are not immediately available. These hardly stand by Electrically driven transportable hoists are available, as these are usually of Lay people are served. Also, these hoists, which change their location more often, are particularly often one exposed to wrong phase connection, their clasping always greater loss of time and thus operational disruptions have in the wake.

The invention relates to a device for achieving the correct direction of rotation of a three-phase motor for hoist drives where the stops attached to the hoist are more ineffective Actuation of the associated limit switch toggle the reversing switch and thus always the correct one Make the motor rotate.

The advantage is that correcting a wrong direction of rotation of the three-phase motor takes place both in the up and down movement at the moment when the associated limit switch are ineffective, without wasting time and consulting a specialist, so that with this device Equipped hoists can be operated by laypeople, as is necessary in some companies is. In particular, the usual costly time losses for producing the correct direction of rotation are eliminated the drive away, which can also result in considerable malfunctions.

In the drawing, an embodiment is shown, it shows

Fig. 1 is a view

Fig. 2 is a top view.

The lifting linkage 1 receives approaches 2, which push the lever 5 forward by 90 ° when the work path is exceeded via the spring hammer 3 or the roller 4. On the lever 5 a pawl 6 is arranged, which engages in a ratchet wheel 7 , which drives the shaft 8 , are attached to the disks 9 with a wave-shaped circumference, which move the contacts 10 and 11 up and down during the lever movement so that eiramal the Contact 10 engages upper terminals 12 and then contact 11 engages lower terminals 13. The contact 10 has a parallel phase guide, while the contact 11 the

Device for achieving the correct
Direction of rotation of a three-phase motor
for hoists

Applicant:

Arthur Mainka,
Springe (Deister), Bürgm.-Peters - Str. 10,
and Hans Rhode,
Hanover, Gneisenaustr. 53

Arthur Mainka, Springe (Deister),

and Hans Rhode, Hanover,
have been named as inventors

Phasing overlaps. If the power supply is incorrectly connected to the actual reversing switch, so that the motor has the wrong operational sense of rotation, the stop 2 strikes against the spring hammer 3 or the roller 4 and pushes the lever 5 , which opens with the pawl 6 via the ratchet wheel 7 the shaft 8 seated disks 9 with the undulating circumference rotates in this case, so that the spring-loaded contacts 10 or 11 change the phase insert in the terminals 12 and thereby constantly give the operationally correct direction of rotation.

Claims (1)

Patent claims: 1. Device for achieving the correct direction of rotation of a three-phase motor for hoist drive, which was normally actuated in a path-dependent manner by means of stops attached to the hoist Limit switch is switched off, regardless of the phase sequence of the feeding network below Use of a further switch connected upstream of the three-phase motor, characterized in that that a reversing switch is arranged as a further switch in such a way that the ones attached to the hoist After ineffective actuation of the associated limit switch, the stops switch over the reversing switch and thereby restore the correct motor rotation. 909 580/309