CN2340119Y

CN2340119Y - Multi-way automatic-change-over three-phase asynchronous electric motor

Info

Publication number: CN2340119Y
Application number: CN 97249103
Authority: CN
Inventors: 覃维明; 罗智成; 夏健生
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-12-30
Filing date: 1997-12-30
Publication date: 1999-09-22
Anticipated expiration: 2007-12-30

Abstract

The utility model discloses a three-phase asynchronous motor. In the utility model, a starting control circuit and an operation circuit are arranged in a connection box which is arranged on the side edge of a housing, and thus mechanical-electrical integration is achieved; in the process of starting and running of the motor, the control circuits make automatically the multi-path windings of each phase of three-phase coils which are arranged on a stator serially connected, parallelly connected or serially and parallelly connected regularly according to the requirements of the output so as to regulate the output power, and the efficiency of the motor is raised; the control operation can be completed only by adopting a measure that the control circuits which are arranged in the connection box are introduced with three-phase electric current and three control lines which are connected with a starting button and a stopping button are led out from the control circuits. The utility model has the advantages of mechanical-electrical integration, high efficiency, energy saving and convenient use.

Description

Multichannel is changed threephase asynchronous automatically

The utility model relates to a kind of threephase asynchronous, especially the layout of its winding and connection thereof.

At present, the bigger motor of power is when starting, and the electric current when controlling its starting is excessive, adopt reduced voltage starting basically, and the volume of reduced voltage starter is bigger, the cost height, and the operation during use is also inconvenient.

The purpose of this utility model provides a kind of current collection motivation, and starting and running control circuit are in the threephase asynchronous of one, and low current starts, and is better than adopting the power output of reduced voltage starter.Be in operation also and can adjust power output according to the variation of load, electric current is steady, start and move these a series of work all automatically control finish.

For achieving the above object, solution of the present utility model is: in three phase windings of the stator of motor, each is provided with the winding of multichannel mutually, adopt the method for Electrical and Electronic control, in the starting of motor and in service, automatically the multichannel winding with three-phase connects into serial or parallel connection, or connection in series-parallel, makes it to reach on electric parameter requirement; Then, select at the electrical equipment and the electronic component of control circuit, big with bearing electric current, volume is little, makes it all to be installed in the terminal box of motor, becomes one with motor, need only draw the control line of three connection start-stop push buttons, introduce three-phase power line, can control operation.Thereby achieve the goal.

Because above-mentioned solution can make the multichannel winding of each phase of three-phase motor stator winding, automatically according to starting and operating load state, connect into serial or parallel connection, or connection in series-parallel, thereby can do the low current starting, regulate power output, reduce reactive loss, improve the power factor (PF) of motor, a large amount of saves energy.Simultaneously, electromechanical integration has been removed the starting device of motor that is provided with in addition such as reduced voltage starter one class from, and shared space, has saved human and material resources, has reduced cost.

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is the circuit theory diagrams of the utility model execution mode.

Fig. 2 is the threephase stator winding of the utility model full mold mode and connects layout plan

Fig. 3 is the outside drawing of the utility model execution mode electromechanical integration motor.

In the circuit theory diagrams of Fig. 1, the electrical equipment of control motor M has: knife switch QS, the heat device FR that continues, push-button switch SB ₁And SB ₂, contactor KM, KM ₁, KM ₂And KM ₃, time relay KT ₁, KT ₂And KT ₃, auxiliary relay KA ₁, KA ₂, KA ₃, KA ₄And KA ₅Also have, " threephase motor star angle conversion automatic controller " module EF that one of the utility model applicant's Luo Zhi became patent in 97 years, the patent No. is: 96217896.9, with and annex sampling mutual inductor LH, transformer B, rectification circuit VD ₂And relay J.Circuit mainly is the multichannel winding of each phase in the control chart 2, press the situation of the starting and the load in service of motor, does various connections.As can be known from Fig. 2, the composition in the three characteristics of the middle term winding is the same with the order of connection and method, so as long as V ₁-V ₂Illustrate mutually: in winding L ₁, L ₂, L ₃And L ₄In four road windings, by KM ₁The closing of contact realize 4 windings in series; Pass through KM ₂The closing of contact realize winding L ₁And L ₃Series connection, winding L 2 and L4 string, the winding of two series connection is in parallel again then; Pass through KM ₃The closing of contact realize winding L ₂And L ₃Series connection, and then and L ₁, L ₄Parallel connection, i.e. 3 road winding parallel connections.Certainly, the winding of every phase also can be provided with multichannel.

Circuit among Fig. 1 is work like this: a, the knife switch QS that closes, use the electric circuit energized, and press starting button SB ₁, 1-2 connects, time relay KT ₁Adhesive, its normally opened contact 1-3 connects; Auxiliary relay KA ₁Adhesive, its normally opened contact 1-3 connects self-locking, and another normally opened contact 1-4 also connects, make contactor KM adhesive, its normally opened contact 1-4 connects and self-locking, in the also closed connection in three contacts of three-phase master control line, it is electric that modular circuit EF is got, and another normally opened contact is connected 1-8, time relay KT ₁The time-delay normally opened contact is connected 8-6; Auxiliary relay KA ₂Adhesive, its 6-7 of often making war connects contactor KM ₁Adhesive makes four winding L among Fig. 3 ₁-L ₄Series connection; 8-9 connects simultaneously, time relay KT ₂Adhesive.Motor is to start under one tunnel the state in 4 tunnel windings in series of every phase, and electric current is very little.

B, relieving starting button SB ₁, 1-2 disconnects, time relay KT ₁Discharge, its normally opened contact time-delay disconnects 8-6, auxiliary relay KA ₂And contactor KM ₁Discharge time relay KT ₁Also discharge, motor one tunnel starts to be finished.Time relay KT ₁Normally-closed contact time-delay connect 8-10, at time relay KT ₂10-11 made auxiliary relay KA also connecting before the normally opened contact time-delay disconnected ₃Adhesive, its contact make 11-12 connect contactor KM ₂Adhesive makes winding L ₁And L ₃Series connection, winding L ₂And L ₄Series connection, the two-way winding is in parallel more then, and motor enters the startup in parallel of every phase two-way winding, and promptly two the tunnel start, and electric current changes very little.Time relay KT ₂During release, time-delay disconnects 10-11, makes auxiliary relay KA ₃With contactor KM ₂Discharge, two tunnel startups are finished.

C, time relay KT ₂During release, 10-14-17-15-16 is connected in its normally closed some time-delay, makes auxiliary relay KA ₄With contactor KM ₃Adhesive, its contact makes winding L ₂And L ₃Series connection is then with winding L ₁, L ₄And be unified into three the tunnel, and promptly enter three the tunnel and start, to compare with two tunnel startups, the variation of its electric current also is very little.

D, auxiliary relay A ₄Adhesive, its contacting 20-21, time relay KT ₃Adhesive and self-locking 20-21, time-delay disconnects 17-15, and 17-19 is connected in time-delay, makes auxiliary relay KA ₄With contactor KM ₃Discharge auxiliary relay KA ₃Adhesive and self-locking 8-19 also connect 8-13, and motor is moved at two road or three line states, controlled by auxiliary relay J by module EF.

E, module EF be by sampled inductance device LH, to the be in operation variation of load of motor M, causes the variation of electric current, inform module EF and handle, when the current value increase, i.e. when load increases, module EF makes auxiliary relay J adhesive, connects 13-16, controls the auxiliary relay KA of three tunnel operations ₄With contactor KM ₃Adhesive makes motor carry out work with three road winding parallel connection methods, increases power output.When current value reduced with the load minimizing, module discharged auxiliary relay J, connects 13-11, controls the auxiliary relay KA of two tunnel operations ₃With contactor KM ₂Adhesive makes motor carry out work with two road winding parallel connection methods, reduces power output, reduces reactive loss.Thereby improved the power factor (PF) of motor.

F, cause electromotor overload or phase-deficient operation when running into other reason, thermal relay FR disconnects 5-24, the control circuit non-transformer, and all relays, contactor and module EF discharge and do not work, and motor shuts down, and reaches the purpose of automatic protection.

G, when the needs motor is out of service, only need press the button SB2, cut off the power supply of control circuit, motor is also out of service.

Fig. 3 is an outside drawing of the present utility model, the same basically with the motor outward appearance of present use, constitute by motor cabinet 25, axle 26, end cap 27, shell 28, suspension ring 29, fan guard 30, fan 31, terminal box 32, stator 38 and rotor 39 etc., also be provided with the wiring board 33 of all auxiliary relays of dress in the terminal box 32, time relay wiring board 35, contactor wiring board 36, and module EF, they all are installed on the terminal block 37, and three meet button SB ₁And SB ₂Control line just pick out from terminal block 37, also have three phase mains terminal 34, introduce three-phase alternating-current supply.Therefore, terminal box 32 is actual is the control box of motor.

Certainly; the profile of motor and control circuit thereof can be diversified; but; whenever in motor stator winding, establish identical multichannel winding mutually, and by automatically controlled method, make between each road winding of homophase and realize serial or parallel connection; or connection in series-parallel connects; with starting and the operational effect of improving motor, be protection range of the present utility model, be suitable for all kinds of motor.

Claims

1, a kind of threephase asynchronous is made up of shell, terminal box, rotor, stator and the threephase stator coil of wire, it is characterized by: motor starting and running control circuit all are loaded in the terminal box on the motor case side, and electromechanics is integral; Wherein, control circuit will be located at the multichannel winding of the every phase in the three-phase coil on the stator automatically in the starting of motor and in service, carry out serial or parallel connection regularly by the requirement of output, or series-parallel connection.

2, threephase asynchronous according to claim 1 is characterized by: the three-phase coil on the stator, and the way of every multichannel winding in mutually is identical, and the order of connection of each corresponding winding is also identical with mode.

3, threephase asynchronous according to claim 1 is characterized by: need only introduce three phase mains on the control circuit in terminal box, draw three control lines that connect starting and stop knob, can carry out control operation.