CN202309588U

CN202309588U - Speed switching control circuit of pole-changing squirrel-cage motor

Info

Publication number: CN202309588U
Application number: CN201220013928XU
Authority: CN
Inventors: 陈彦宏
Original assignee: Topasia Machinery Industry (kunshan) Co Ltd
Current assignee: Topasia Machinery Industry (kunshan) Co Ltd
Priority date: 2012-01-13
Filing date: 2012-01-13
Publication date: 2012-07-04
Anticipated expiration: 2022-01-13

Abstract

The utility model provides a speed switching control circuit of a pole-changing squirrel-cage motor. The speed switching control circuit comprises a motor starting and braking module and a control loop module. The motor starting and braking module is connected with an electric supply module, the control loop module is connected with the electric supply module through a transformer module, and a time relay is connected in a rapid starting loop of the control loop module. According to the speed switching control circuit disclosed by the utility model, the problem in the prior art that error motion of an electronic over-current and overload protection device is caused by continuous surge of current when the motor is converted into a rapid rotation state from a starting phase is solved. Therefore, the time between converting from a slow speed to a rapid speed is ensured to be enough to avoid the surge of starting current by adding a time relay on the pole-changing motor for speed switching. The requirement on a skill level of an operator is reduced, the electric error motion is effectively avoided, and the service life of the motor and the service life of the control circuit are greatly prolonged.

Description

The pole-changing squirrel-cage motor is conversion control circuit at a slow speed soon

Technical field

The utility model has related to a kind of control circuit, has especially related to a kind of pole-changing squirrel-cage motor conversion control circuit at a slow speed soon, belongs to the Motor Control technical field.

Background technology

The starting current of squirrel-cage motor when starting can be very big; Maximum about 7 times of can reach rated current; The mode of directly connecting is adopted in the fast conversion at a slow speed of conventional change pole motor, if operator's operant level is unskilled, when the startup stage that startup just also is at a slow speed, just being transformed into quick rotation; This moment, starting current at a slow speed can form continuous surging with quick starting current; And cause that electronic type over-current and-load protective device produces misoperation, and cause trip protection and influence normal use, significantly improve the motor life-span simultaneously.

The utility model content

The utility model technical problem to be solved provides a kind of pole-changing squirrel-cage motor conversion control circuit at a slow speed soon; Guarantee that the fast time between the conversion at a slow speed enough avoids the electric current surging that starts; Effectively avoid protecting electric misoperation, the life-span of significantly having improved motor and control apparatus.

In order to solve the problems of the technologies described above, the technical scheme that the utility model adopted is:

A kind of pole-changing squirrel-cage motor is conversion control circuit at a slow speed soon; Comprise electric motor starting, brake module, control loop module; Said electric motor starting, brake module are connected with the civil power module; Said control loop module is connected with the civil power module through transformer module, is connected with a time relay in the quick startup loop of said control loop module.

Aforesaid pole-changing squirrel-cage motor is conversion control circuit at a slow speed soon, and it is characterized in that: said control loop module also is connected with a phase failure and phase sequence relay.

Aforesaid pole-changing squirrel-cage motor is conversion control circuit at a slow speed soon, and it is characterized in that: said control loop module also is connected with a load lifting limiter module.

Aforesaid pole-changing squirrel-cage motor is conversion control circuit at a slow speed soon, it is characterized in that: also be connected with fan on said electric motor starting, the brake module.

The beneficial effect of the utility model is: changing at a slow speed soon at change pole motor directly increases the time relay; Guarantee that the time between the conversion is enough avoided the starting current surging at a slow speed soon; Reduction is to the requirement of operator's level of skill; Effectively avoid protecting electric misoperation, significantly improve motor and control apparatus life-span.

Description of drawings

Fig. 1 is the fast connection sketch map of conversion control circuit at a slow speed of the utility model pole-changing squirrel-cage motor;

Fig. 2 is that the circuit of the fast control loop of conversion control circuit at a slow speed of the utility model pole-changing squirrel-cage motor connects sketch map.

Embodiment

Below in conjunction with accompanying drawing the utility model is further described.Following examples only are used for more clearly explaining the technical scheme of the utility model, and can not limit the protection range of the utility model with this.

As depicted in figs. 1 and 2; A kind of pole-changing squirrel-cage motor is conversion control circuit at a slow speed soon; Comprise electric motor starting, brake module 1, control loop module 2; Said electric motor starting, brake module 1 are connected with civil power module 4, and said control loop module 2 is connected with civil power module 4 through transformer module 3, it is characterized in that: be connected with a time relay KT1 in the quick startup loop of said control loop module 2.

Press starting switch SB2; Control loop 40->3->29 conductings, relay K 1 coil gets electric, two normally opened contact closures of K1; 1->2 loop conductings completion self-lockings; 31->32 loop conducting contactor KM1 coils get electric, the KM1 closing of contact in the main circuit, auxiliary contact KM1 in the control loop is closed.Press switch S B4, control loop 4->5-> ->30->29 conductings, relay K 2 coils get electric, and the auxiliary contact of K2 are closed, the loop conducting that moves upward in the control loop, contactor KM2 coil gets electric, the KM2 closing of contact in the main circuit; After pressing SB4, control loop 26->30 also conductings, relay K 4 coils get electric, and the auxiliary contact of K4 are closed; Time relay KT1 coil gets electric, the KT1 closing of contact in the quick rotation loop in the control loop, and the coil of contactor KM4 gets; The main circuit KM4 closing of contact; The all closed rear motor of KM1, contact KM2 and contact KM4 up moves in the contact, owing to once added time relay KT1 in the quick rotation loop, guarantees that soon the time between the conversion is enough avoided the starting current surging at a slow speed; Effectively avoid protecting electric misoperation, significantly improve motor and control apparatus life-span.By switch S B5, motor is down motion accordingly, and is similar with said process.

Said control loop module 2 also is connected with a phase failure and phase sequence relay, and the protection motor makes reversing of position change phase sequence between the phase line.

Said control loop module 2 also is connected with a load lifting limiter module 5, and when the lifting capacity of motor was transshipped, contact T1 broke off, and motor quits work, and has effectively guaranteed the normal use of motor.

Also be connected with fan 6 on said electric motor starting, the brake module 1, effectively the motor in the work dispelled the heat, prolonged the life-span of motor.

In sum; A kind of pole-changing squirrel-cage motor that the utility model provides is conversion control circuit at a slow speed soon; Guarantee that the fast time between the conversion at a slow speed enough avoids the electric current surging that starts, effectively avoid protecting electric misoperation, the life-span of significantly having improved motor and control apparatus.

More than show and described basic principle, principal character and the advantage of the utility model.The technical staff of the industry should understand; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the specification that the utility model just is described; Under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications, and these variations and improvement all fall in the utility model scope that requires protection.The utility model requires protection range by appending claims and equivalent circle thereof.

Claims

1. pole-changing squirrel-cage motor conversion control circuit at a slow speed soon; Comprise electric motor starting, brake module (1), control loop module (2); Said electric motor starting, brake module (1) are connected with civil power module (4); Said control loop module (2) is connected with civil power module (4) through transformer module (3), it is characterized in that: be connected with a time relay (KT1) in the quick startup loop of said control loop module (2).

2. pole-changing squirrel-cage motor according to claim 1 is conversion control circuit at a slow speed soon, and it is characterized in that: said control loop module (2) also is connected with a phase failure and phase sequence relay.

3. pole-changing squirrel-cage motor according to claim 1 and 2 is conversion control circuit at a slow speed soon, and it is characterized in that: said control loop module (2) also is connected with a load lifting limiter module (5).

4. pole-changing squirrel-cage motor according to claim 3 is conversion control circuit at a slow speed soon, it is characterized in that: also be connected with fan (6) on said electric motor starting, the brake module (1).