CN1047699C - Multi-machine shared auto-transformer voltage drop starting complex control method - Google Patents

Abstract

The present invention provides a reduced voltage starting method for an improved autotransformer, which improves on a single machine using method into a multi-machine using method. The automatic starting control method by decompression by turns that two motors, three motors, four motors, five motors or a plurality of motors shares one autotransformer for automatic starting control is applied to multi-machine manufacturing machines without frequent starting, such as a brick making unit, a pump unit, a blower, etc., and integrated control for the electric traction of an operation combination unit.

Description

Many motors shared auto-transformer voltage drop starting complex control method

The present invention relates to the method for a transformer step-down starting rotation multiple electric motors of a kind of employing, particularly a kind of method that adopts autotransformer step-down starting rotation multiple electric motors.

At present, carry out in the electric integrated control of multimachine manufacturing machine and running combination unit at Fraquent start motor not, among the production as brickmaking unit, water pump assembly, blower fan etc. all is motor of a transformer configuration, and operation is inconvenience very, and the accident of mistake starting takes place sometimes.

The object of the present invention is to provide the method for an autotransformer step-down of a kind of usefulness starting rotation multiple electric motors, be well suited for the bat extruder as the brickmaking unit, mixer is to the usefulness of multiple electric motors starting rotations such as roller.

Embodiment of the present invention are, according to autotransformer chromium board, rating data, allowing the continuous load starting time was 120 seconds, and the general motor starting time commonly used was 10～14 seconds, like this, adopt an autotransformer just can shared five motor carry out starting rotation be have fully more than needed.Simultaneously; for the purpose of more conservative; select the capacity of the capacity of autotransformer greater than motor; be exactly to realize entirely; be applied to the water pump pressurizing point in the practice; as three 55KW water pumps and the unit that the 40KW water pump is formed; can select the shared autotransformer reduced voltage starting voltage source circuit of four motor of a 75KW autotransformer during design; and the configuration air switch is as short circuit and the overload protection motor starting and the operation process of motor; be to adopt the time relay, auxiliary relay, A.C. contactor; button; circuit breaker; fuse, relay program are converted automatically.

Following preference is that the present invention is elaborated in conjunction with the accompanying drawings, but does not limit the scope of the invention.

Fig. 1 is the major loop figure of the shared autotransformer step-down starting rotation of four motor of the present invention.

Fig. 2 is the operation circuit figure of Fig. 1.

Wherein 1SB-8SB is a control button, and 1KM-9KM is a contactor, and 1KT-4KT is the time relay, 1KA-4KA is middle relay road, and 1QF-5QF is a circuit breaker, and 1F-2F is a fuse, T is an autotransformer, and 1M-4M is a motor, more than all general market of each electrical equipment can buy.

Method of operation and principle are: drive in no particular order; when for example driving the 1M motor earlier; close 1QF-5QF circuit breaker earlier; major loop and operation circuit have all been switched on, and press starting button 2SB, 9KM and the adhesive of 1KM starting contactor; the 1M motor starting; by time principle program, delayed time for 10 seconds the adhesive of 1KA auxiliary relay after the adhesive of the 1KT time relay; 1KM and 9KM discharge; the 1M motor starting finishes, then 2KM running contactor adhesive, and 1M motor total head gets into smooth; during shutdown; hand stops button by 1SB, and 2KM running contactor discharges, and the outage of 1M motor stops.2nd, the 3rd, the 4th motor carries out with the 1st Motor Control program.

Advantage of the present invention is:

1. multiple motors can share an auto-transformer.

Startup-shutdown in no particular order, easy to operate, artificial misoperation can not appear.

3. for the not operation or the production of Fraquent start multiple electric motors, very suitable as brickmaking machine series water pump and blower fan series.

Claims (2)

1. a multiple motor wheel flows the method for starting, the method that it is characterized in that a shared autotransformer step-down starting rotation, when the 1st motor of starting (1M), each circuit breaker closes earlier, press the 2SB button then, 1KM and 9KM contactor adhesive 1M starting are by delaying time for 10 seconds the adhesive of 1KA auxiliary relay after the adhesive of the time principle program 1KT time relay, 1KM and 9KM discharge, the 1M motor starting finishes, then 2KM running contactor adhesive, the running of 1M motor total head; During shutdown, hand is pressed the 1SB button, and 2KM contacts release, and the outage of 1M motor stops; 2nd, the operation of the 3rd, the 4th motor is identical with the 1st motor program.

2. according to the starting rotation method of claim 1, it is characterized in that selecting for use the capacity of autotransformer should be greater than the capacity of maximum electrical equipment in the multiple motors.

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