CN103414162A

CN103414162A - Motor forward/reverse rotation protection device

Info

Publication number: CN103414162A
Application number: CN201310295930XA
Authority: CN
Inventors: 谯兴宇
Original assignee: Dazhou Electric Power Bureau Of Sichuan Electric Power Co; State Grid Corp of China SGCC
Current assignee: Dazhou Electric Power Bureau Of Sichuan Electric Power Co; State Grid Corp of China SGCC
Priority date: 2013-07-15
Filing date: 2013-07-15
Publication date: 2013-11-27

Abstract

The invention discloses a motor protection device, in particular to a motor forward and reverse protection device. The main control loop includes a start button SA1, a contactor 1KM, a normally closed contact 2KM1 of the contactor 2KM, and a stop button SB connected in series. , normally closed temperature control switch KSD1, normally closed temperature control switch KSD2 and normally closed temperature control switch KSD3, wherein the start button SA1 is connected in parallel with the normally open contact 1KM3 of the contactor 1KM, and the main control circuit also includes the U phase of the slave power supply in series Connect the start button SA2, the contactor 2KM and the normally closed contact 1KM1 of the contactor 1KM, and connect between the normally closed contact 2KM1 of the contactor 2KM and the stop button SB, wherein the start button SA2 is connected in parallel with the contactor 2KM Normally open contact 2KM2 and other features. When the motor is running forward and reverse, it can monitor the temperature of each stator coil of the three-phase motor in an all-round way and with high sensitivity in real time. When any stator coil reaches the predetermined temperature, it will control the power supply to stop the three-phase motor. Power supply to protect the three-phase motor.

Description

A kind of motor positive and inverse protective device

Technical field

The present invention relates to a kind of electric motor protective device, be specifically related to a kind of motor positive and inverse protective device.

Background technology

While the situation such as overload, phase shortage, blocking when motor, occurring in the forward and backward running, while continuing operation, the insulation of coil of stator of motor is easy to damage, thereby various temperature protective devices occurred.

Now the temperature protective device of motor is various on the market, and pluses and minuses are respectively arranged, and roughly is divided into: 1, and insufficient sensitivity, the protection temperature is non-constant, and perhaps temperature does not still play a protective role higher than safety line yet; 2, the apparatus structure complexity, high cost, and also along with aluminium core motor is universal cheaply, because copper core is larger than the ampacity of the aluminum core line of same model, under identical service condition, the stator coil of aluminium core motor more capacity damages.

Summary of the invention

The object of the present invention is to provide a kind of motor positive and inverse protective device, solved current electric motor protective device insufficient sensitivity, operating temperature just differs, the problem that complex structure, cost are too high.

For solving above-mentioned technical problem, the present invention by the following technical solutions: a kind of motor positive and inverse protective device, comprise and be connected to power supply U phase and the power supply W main control loop between mutually,

Described main control loop comprises start button SA1, contactor 1KM, normally-closed contact 2KM1, the stop button SB of contactor 2KM, normally closed temperature detect switch (TDS) KSD1, normally closed temperature detect switch (TDS) KSD2 and the normally closed temperature detect switch (TDS) KSD3 of serial connection successively, wherein start button SA1 is parallel with the normally opened contact 1KM3 of contactor 1KM

Main control loop also comprises from power supply U phase start button SA2, the contactor 2KM of serial connection successively and the normally-closed contact 1KM1 of contactor 1KM in addition, be connected between the normally-closed contact 2KM1 and stop button SB of contactor 2KM, wherein said start button SA2 is parallel with the normally opened contact 2KM2 of contactor 2KM;

Described normally closed temperature detect switch (TDS) KSD1 is arranged on the U phase coil of three phase electric machine, and normally closed temperature detect switch (TDS) KSD2 is arranged on the V phase coil of three phase electric machine, and normally closed temperature detect switch (TDS) KSD3 is arranged on the W phase coil of three phase electric machine;

There is the normally opened contact 1KM0 of relay 1KM to be serially connected in the forward supply line of described three phase electric machine, have the normally opened contact 2KM0 of relay 2KM to be serially connected in the counter-rotating supply line of described three phase electric machine.

Further technical scheme is, the normally opened contact 1KM3 and the forward that between described power supply U phase and power supply W phase, are serially connected with successively relay 1KM start warning light HD-1; The normally opened contact 2KM3 and the counter-rotating that between described power supply U phase and power supply W phase, are serially connected with successively relay 2KM start warning light LD-1.

Further technical scheme is, described power supply U phase and power supply W be serially connected with successively between mutually relay 1KM normally-closed contact 1KM4, relay 2KM normally-closed contact 2KM4 and stop warning light LD.

Compared with prior art; the invention has the beneficial effects as follows: when motor the time can both comprehensive, highly sensitive each stator coil temperature to three phase electric machine be monitored in real time in forward, counter-rotating; when any one stator coil reaches predetermined temperature; namely can control power supply stops, to the three phase electric machine power supply, playing the effect of protection three phase electric machine.

The accompanying drawing explanation

Fig. 1 is circuit connection diagram of the present invention.

Fig. 2 is the installation site schematic diagram of temperature detect switch (TDS) of the present invention in three phase electric machine.

Fig. 3 is motor circuit connection layout of the present invention.

Embodiment

In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.

Fig. 1, Fig. 2 and Fig. 3 show an embodiment of motor positive and inverse protective device of the present invention: a kind of motor positive and inverse protective device, comprise the main control loop be connected between power supply U phase and power supply W phase,

As shown in Figure 1, described main control loop comprises start button SA1, contactor 1KM, normally-closed contact 2KM1, the stop button SB of contactor 2KM, normally closed temperature detect switch (TDS) KSD1, normally closed temperature detect switch (TDS) KSD2 and the normally closed temperature detect switch (TDS) KSD3 of serial connection successively, wherein start button SA1 is parallel with the normally opened contact 1KM3 of contactor 1KM

As shown in Figure 2, described normally closed temperature detect switch (TDS) KSD1 is arranged on the U phase coil of three phase electric machine, and normally closed temperature detect switch (TDS) KSD2 is arranged on the V phase coil of three phase electric machine, and normally closed temperature detect switch (TDS) KSD3 is arranged on the W phase coil of three phase electric machine;

As shown in Figure 3, there is the normally opened contact 1KM0 of relay 1KM to be serially connected in the forward supply line of described three phase electric machine, have the normally opened contact 2KM0 of relay 2KM to be serially connected in the counter-rotating supply line of described three phase electric machine.

Fig. 1 also shows another embodiment of motor positive and inverse protective device of the present invention, and the normally opened contact 1KM3 and the forward that between described power supply U phase and power supply W phase, are serially connected with successively relay 1KM start warning light HD-1; The normally opened contact 2KM3 and the counter-rotating that between described power supply U phase and power supply W phase, are serially connected with successively relay 2KM start warning light LD-1.

Fig. 1 also shows another embodiment of motor positive and inverse protective device of the present invention, described power supply U phase and power supply W be serially connected with successively between mutually relay 1KM normally-closed contact 1KM4, relay 2KM normally-closed contact 2KM4 and stop warning light LD.

Operation principle of the present invention is: no matter motor is in forward or inverted status, any one in the normally closed temperature detect switch (TDS) KSD1 in three phase electric machine, normally closed temperature detect switch (TDS) KSD2 and normally closed temperature detect switch (TDS) KSD3 disconnects because corresponding stator coil excess Temperature triggers its normally-closed contact, relay 1KM or relay 2KM outage, normally opened contact 1KM0 or normally opened contact 2KM0 disconnect, and cause three phase electric machine M to stop operating.

And when three phase electric machine was in the forward state, relay 1KM was in "on" position, its normally opened contact 1KM3 closure, forward start warning light HD-1 and light.

When three phase electric machine was in inverted status, relay 2KM was in "on" position, and its normally opened contact 2KM3 closure, forward start warning light LD-1 and light.

When three phase electric machine quits work, be that the normally-closed contact 1KM4 of relay 1KM and the normally-closed contact 2KM4 of relay 2KM all are in closure state, stop warning light LD and light.

In the present invention, normally closed temperature detect switch (TDS) KSD1, normally closed temperature detect switch (TDS) KSD2 and normally closed temperature detect switch (TDS) KSD3 are selecting temperature control point with the exhausted about grade of motor as a reference, and temperature control point should be identical, and the temperature detect switch (TDS) of KSD9700 of all take is example.

Claims

1. A motor forward and reverse protection device, characterized in that: comprising a main control circuit connected between the U phase of the power supply and the W phase of the power supply,

The main control circuit includes the start button SA1, the contactor 1KM, the normally closed contact 2KM1 of the contactor 2KM, the stop button SB, the normally closed temperature control switch KSD1, the normally closed temperature control switch KSD2 and the normally closed temperature control circuit which are sequentially connected in series. Switch KSD3, wherein the start button SA1 is connected in parallel with the normally open contact 1KM3 of the contactor 1KM,

In addition, the main control circuit also includes the start button SA2 connected in series from the U phase of the power supply, the contactor 2KM and the normally closed contact 1KM1 of the contactor 1KM, connected between the normally closed contact 2KM1 of the contactor 2KM and the stop button SB, Wherein the start button SA2 is connected in parallel with the normally open contact 2KM2 of the contactor 2KM;

The normally closed temperature control switch KSD1 is installed on the U-phase coil of the three-phase motor, the normally closed temperature control switch KSD2 is installed on the V-phase coil of the three-phase motor, and the normally closed temperature control switch KSD3 is installed on the W phase of the three-phase motor on the coil;

The normally open contact 1KM0 of the relay 1KM is connected in series in the forward rotation power supply line of the three-phase motor, and the normally open contact 2KM0 of the relay 2KM is connected in series in the reverse rotation power supply line of the three-phase motor.

2. A motor forward and reverse protection device according to claim 1, characterized in that: the normally open contact 1KM3 of the relay 1KM and the forward rotation start prompt light are sequentially connected in series between the U phase of the power supply and the W phase of the power supply HD-1; the normally open contact 2KM3 of the relay 2KM and the reverse start prompt light LD-1 are sequentially connected in series between the U phase of the power supply and the W phase of the power supply.

3. A motor forward and reverse protection device according to claim 1, characterized in that: the normally closed contact 1KM4 of the relay 1KM and the normally closed contact of the relay 2KM are sequentially connected in series between the U phase of the power supply and the W phase of the power supply. Close contact 2KM4 and stop prompt light LD.