CN2183635Y

CN2183635Y - Reactance startor for multi-function electric motor

Info

Publication number: CN2183635Y
Application number: CN 94204739
Authority: CN
Inventors: 周世恩
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-02-06
Filing date: 1994-02-06
Publication date: 1994-11-23
Anticipated expiration: 2004-02-06

Abstract

The utility model relates to a reactance starter for motor, comprising a reactor and a start control circuit. The start control circuit comprises a start button, a stop button, an AC contactor, an intermediate relay and a time delay relay. The utility model is characterized in that the reactor adopts a three phase reactor of closed magnetic circuit, wherein, every winding comprises two coils. The starting performance of a starter can be regulated through the straight polarity and the reverse polarity of two coils or only one coil poled in the circuit. Thus, the purpose of expanding the same using field of starter is obtained. The utility model can be used for no load, fractional load and heavy load motors. The start is stable without switching electric currents, the design of the control circuit is simple, and the cost of manufacture is low.

Description

Reactance startor for multi-function electric motor

The utility model relates to a kind of motor starter.

Squirrel-cage motor generally adopts auto-induction voltage-reduced starting device and Y/ △ starter etc. to finish starting process at present.This dual mode handoff procedure has switch current to impact, and makes the switching contact easy damaged, when contactor misoperation or contact adhesion meeting cause the power supply short circuit accident.The patent No. is 93228036.6 utility application, a kind of motor reactance starter is disclosed, the three-phase reactor that does not have yoke that its reactor constitutes for the coil that has a columnar iron core by three, it has advantages such as can realizing smooth start, no switch current variation, but this reactance starter only limits to zero load or underloading situation, and heavily loaded load can not use, and reactor is a no yoke type, conductor material is saved inadequately, and also there is the signal misregister in control loop, and cost is than problems such as height.

The purpose of this utility model provides a kind of start request that can satisfy different starting performance motor, the multifunctional motor reactance starter that cost is low.

The utility model is made of reactor and control loop, and wherein reactor adopts closed magnetic circuit iron core three-phase reactor, and the starting control loop is made up of starting, stop button, A.C. contactor, the time relay, auxiliary relay etc.It is characterized in that three phase windings on the closed magnetic circuit three-phase reactor all are respectively to be made of two different coils of the number of turn, these two coils can be connected in a different manner, promptly can just connect, reversal connection or only with one of them coil place in circuit, regulate the impedance of reactor by this way, can make the scope of application of same reactance starter be able to very big expansion, satisfy different starting instructions for uses.Reactor adopts closed magnetic circuit, can obtain higher magnetic flux density, has very big magnetizing current, can pass through the choose reasonable of pair cross-section, the number of turn, iron core, reaches the purpose that saves material.

For realizing that control loop does not have switch current to main circuit and impacts, can on control loop, establish the break contact of an auxiliary relay and connect with the starting ac contactor coil, this auxiliary relay is connected with the auxiliary make contact of control major loop A.C. contactor; When main A.C. contactor get electric, make contact closed after, auxiliary relay gets electric, makes the break contact action of auxiliary relay, the start loop outage has so just reached the purpose that does not have the switch current process.

This motor reactance starter scope of application is wide, and starting performance can be adjusted flexibly, can smooth start, and Circuit Design is rationally simple, and main circuit is not had the switch current process, and can not or malfunctioningly cause short circuit because of the contactor misoperation.Cost is low, and is easy to maintenance, and with other starter of capacity relatively, cost can reduce by 20～30%.

Fig. 1 is an electrical schematic diagram of the present utility model.

Fig. 2 is the schematic diagram of the utility model reactor.

The utility model is described in further detail below in conjunction with embodiment that accompanying drawing is given:

As Fig. 1, three-phase automatic air-break switch ZK, major loop A.C. contactor XLC make contact are serially connected between power supply and the motor.Closed magnetic circuit three-phase reactor DK be parallel on the XLC make contact after starting A.C. contactor QC make contact is connected.To 100KW～315KW motor, establish by current transformer LH at major loop ₁, LH ₂, thermal relay RJ etc. constitutes overload protecting circuit.

Start control loop by A.C. contactor XLC, QC, time relay sj, intermediate relay ZJ, fuse 1RD, 2RD, running, starting, stop light LD, UD, HD etc.

During use, the automatic air-break switch ZK that closes, control loop gets electric, and indicator light HD is bright, the expression control circuit has electricity, presses starting button QA then, and A.C. contactor QC gets electric, its make contact closure, motor begins starting, and this moment, the QC break contact disconnected, and indicator light HD extinguishes, and UD is bright.Through behind the certain hour, control major loop A.C. contactor XLC is connected in the time relay sj action, its make contact closure, and intermediate relay ZJ gets electric, and indicator light LD is bright, and the expression motor obtains total head.ZJ get electric after, its break contact disconnects, the QC outage, indicator light UD extinguishes, control circuit is finished starting and is not had the switch current process.At this moment the The whole control loop has only XLC and signal lamp charged, and other control element all quits work, thereby control loop was both energy-conservation, and element is prolonged useful life.For the motor starting control loop of 100KW～315KW, should increase an auxiliary relay to amplify contact rating.

As shown in Figure 3, every phase winding of three-phase closed magnetic circuit reactor is made up of two different coils of the number of turn respectively, iron core can adopt the E type, the material of iron core, cross section and size, and umber of turn and lead capacity etc. require to be determined according to power of electric motor and starting performance.Two coil connected modes and starting current relation are exemplified below:

Supply voltage is 380V, motor power (output) is 22KW, every phase winding two coil turns are respectively 10 circles and 5.0 circles, two coils just connect, during only with the reversal connection of 50 circle coils, starting current is 3.5,4,5 times that motor total head locked rotor current is respectively the motor rated current, and these three kinds of connected modes can be respectively applied for zero load, underloading and heavy-load start.

Casing of the present utility model adopts iron-clad frame-type safeguard structure, and guidance panel is provided with the starting current indication, starts, stops (power supply of holding concurrently) signal indication, starting, stop button etc.Be provided with reactor, A.C. contactor, auxiliary relay, the time relay, automatic air-break switch etc. in the case.

Claims

1, a kind of reactance starter of motor, comprise reactor and starting control loop, wherein reactor is a closed magnetic circuit iron core three-phase reactor, the starting control loop is made up of starting, stop button, A.C. contactor, the time relay, auxiliary relay etc., it is characterized in that each phase winding on the closed magnetic circuit three-phase reactor all is to be made of two different coils of the number of turn.

2, motor reactance starter according to claim 1, it is characterized in that having in the control loop break contact of an auxiliary relay to connect with the starting ac contactor coil, this auxiliary relay is connected with the auxiliary make contact of control major loop A.C. contactor.