CN103414160A - Motor automatic protection control device - Google Patents

Abstract

The invention discloses a motor temperature protection device, in particular to a motor automatic protection control device, wherein a normally closed temperature control switch KSD1 and a normally open temperature control switch KSD2 are both installed on the U-phase stator coil of the motor, and the normally closed Both the temperature control switch KSD3 and the normally open temperature control switch KSD4 are installed on the V-phase stator coil of the motor, and the normally closed temperature control switch KSD5 and the normally open temperature control switch KSD6 are both installed on the W-phase stator coil of the motor. The present invention can monitor the temperature in real time from the temperature control switch installed on the stator coil of the motor. When the temperature reaches a predetermined height, it will automatically cut off the power supply of the motor, avoiding the damage of the stator coil insulation caused by the continuous rise of the temperature of the stator coil. The contact pressure gauge also monitors the pressure of the motor in real time. When the pressure of the motor is too high, it will automatically cut off the power supply of the motor, which improves the service life of the motor.

Description

A motor automatic protection control device

technical field

The invention relates to a motor temperature protection device, in particular to a motor automatic protection control device.

Background technique

When the motor continues to run under the conditions of overload, phase loss, jamming, etc., the motor continues to run. If the running motor cannot be stopped quickly, the insulation of the motor stator coil is easily damaged, and various temperature protections appear. device.

At present, there are many temperature protection devices for motors on the market, each with its own advantages and disadvantages, which can be roughly divided into: 1. The sensitivity is not enough, and the protection temperature is not constant. Even if the temperature is higher than the safety line, it still does not play a protective role; 2. The structure of the device is complex and costly. too high. And with the popularity of low-cost aluminum core motors, since the copper core wire has a larger carrying capacity than the same type of aluminum core wire, under the same use conditions, the stator coil of the aluminum core motor is more likely to be damaged.

Contents of the invention

The purpose of the present invention is to provide an automatic motor protection control device, which solves the problem that the current motor is running at high temperature, the accuracy and timeliness of the temperature protection device are insufficient, and the result is too complicated and the cost is too high.

In order to solve the above technical problems, the present invention adopts the following technical solutions: an automatic motor protection control device, including a first branch, a second branch and a third branch connected between the U phase of the power supply and the W phase of the power supply;

The first branch is composed of the contact P of the electric contact pressure gauge, the contact switch YX1, the contact P1 of the electric contact pressure gauge, the relay 1KV and the normally closed contact KM1 of the contactor KM, which are sequentially connected in series from the U phase of the power supply, Connected to the W phase of the power supply, wherein the contact P of the electric contact pressure gauge is additionally connected in series with the contact switch YX2, the contact P2 of the electric contact pressure gauge, the relay 2KV and the normally open contact KM3 of the contactor KM. To the W phase of the power supply;

The second branch consists of the experiment button SB, the stop button SA, the contactor KM, the normally closed contact 2KV1 of the relay 2KV, the normally closed temperature control switch KSD1, the normally closed temperature control switch KSD3 and the normally closed temperature control switch KSD1 connected in series from the U phase of the power supply. The closed temperature control switch KSD5 is connected to the W phase of the power supply, wherein the experimental button SB is connected in parallel with the normally open contact KM2 of the contactor KM, and is connected in parallel with the normally open contact 1KV2 of the relay 1KV;

The third branch is composed of a shunt trip coil QA connected in series with the U phase of the power supply and a normally open thermostat KSD2, wherein the normally open thermostat KSD2 is connected in parallel with a normally open thermostat KSD4, and in parallel with a normally open thermostat Controller KSD6;

The normally closed contact QA1 of the shunt tripping coil QA and the normally open contact KM0 of the relay KM are connected in series to the power line of the motor;

Both the normally closed temperature control switch KSD1 and the normally open temperature control switch KSD2 are installed on the U-phase stator coil of the motor, and the normally closed temperature control switch KSD3 and the normally open temperature control switch KSD4 are both installed on the V-phase stator coil of the motor Above, the normally closed temperature control switch KSD5 and the normally open temperature control switch KSD6 are both installed on the W-phase stator coil of the motor.

A further technical solution is that the device also includes a fourth branch and a fifth branch connected between the U phase of the power supply and the W phase of the power supply, including a sixth branch connected between the V phase of the power supply and the W phase of the power supply ;

The fourth branch is composed of the normally closed contact KM4 of the relay KM connected in series from the U phase of the power supply and the stop prompt lamp LD1, and is connected to the W phase of the power supply;

The fifth branch is composed of the normally open contact KM5 of the relay KM connected in series from the U phase of the power supply and the start prompt light LD2, and is connected to the W phase of the power supply;

The sixth branch is composed of the normally open contact KM0 of the relay KM connected in series from the V phase of the power supply and the work prompt lamp HD, and is connected to the W phase of the power supply.

A further technical solution is that the normally closed temperature control switch KSD1, the normally open temperature control switch KSD2, the normally closed temperature control switch KSD3, the normally open temperature control switch KSD4, the normally closed temperature control switch KSD5 and the normally open temperature control switch KSD6 All are KSD9700 temperature control switches.

Compared with the prior art, the beneficial effects of the present invention are: the present invention can monitor the temperature in real time from the temperature control switch installed on the stator coil of the motor, and when the temperature reaches a predetermined height, it will automatically cut off the power supply of the motor to avoid The temperature of the stator coil continues to rise and damage the insulation of the stator coil. In addition, the electric contact pressure gauge also monitors the pressure of the motor in real time. When the pressure of the motor is too high, it will automatically cut off the power supply of the motor, which improves the service life of the motor.

Description of drawings

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

Fig. 2 is a schematic diagram of the installation position of the temperature control switch of the present invention in the motor.

Fig. 3 is a motor circuit connection diagram of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Figure 1, Figure 2 and Figure 3 show an embodiment of an automatic motor protection control device of the present invention: it includes a first branch, a second branch and a third branch connected between the U phase of the power supply and the W phase of the power supply Branch road;

The first branch is composed of the contact P of the electric contact pressure gauge, the contact switch YX1, the contact P1 of the electric contact pressure gauge, the relay 1KV and the normally closed contact KM1 of the contactor KM, which are sequentially connected in series from the U phase of the power supply, Connected to the W phase of the power supply, wherein the contact P of the electric contact pressure gauge is additionally connected in series with the contact switch YX2, the contact P2 of the electric contact pressure gauge, the relay 2KV and the normally open contact KM3 of the contactor KM. To the W phase of the power supply;

The second branch consists of the experiment button SB, the stop button SA, the contactor KM, the normally closed contact 2KV1 of the relay 2KV, the normally closed temperature control switch KSD1, the normally closed temperature control switch KSD3 and the normally closed temperature control switch KSD1 connected in series from the U phase of the power supply. The closed temperature control switch KSD5 is connected to the W phase of the power supply, wherein the experimental button SB is connected in parallel with the normally open contact KM2 of the contactor KM, and is connected in parallel with the normally open contact 1KV2 of the relay 1KV;

The third branch is composed of a shunt trip coil QA connected in series with the U phase of the power supply and a normally open thermostat KSD2, wherein the normally open thermostat KSD2 is connected in parallel with a normally open thermostat KSD4, and in parallel with a normally open thermostat Controller KSD6;

The normally closed contact QA1 of the shunt tripping coil QA and the normally open contact KM0 of the relay KM are connected in series to the power line of the motor;

Both the normally closed temperature control switch KSD1 and the normally open temperature control switch KSD2 are installed on the U-phase stator coil of the motor, and the normally closed temperature control switch KSD3 and the normally open temperature control switch KSD4 are both installed on the V-phase stator coil of the motor Above, the normally closed temperature control switch KSD5 and the normally open temperature control switch KSD6 are both installed on the W-phase stator coil of the motor.

According to another embodiment of the automatic motor protection control device of the present invention, the device also includes a fourth branch and a fifth branch connected between the U phase of the power supply and the W phase of the power supply, including the connection between the V phase of the power supply and the power supply W phase. The sixth branch between phase W;

The fourth branch is composed of the normally closed contact KM4 of the relay KM connected in series from the U phase of the power supply and the stop prompt lamp LD1, and is connected to the W phase of the power supply;

The fifth branch is composed of the normally open contact KM5 of the relay KM connected in series from the U phase of the power supply and the start prompt light LD2, and is connected to the W phase of the power supply;

The sixth branch is composed of the normally open contact KM0 of the relay KM connected in series from the V phase of the power supply and the work prompt lamp HD, and is connected to the W phase of the power supply.

It is worth pointing out here that the order of the power U phase, the power W phase and the power V phase is not necessarily the same as the above sequence, and the order can be reversed.

According to another embodiment of the automatic motor protection control device of the present invention, the normally closed temperature control switch KSD1, the normally open temperature control switch KSD2, the normally closed temperature control switch KSD3, the normally open temperature control switch KSD4, the normally closed temperature control switch The switch KSD5 and the normally open temperature control switch KSD6 are both KSD9700 temperature control switches. As a preference, the temperature control point can be selected at 80°C.

The working principle of the present invention is: contact P and contact P1 can be connected through the contact switch YX1 of the electric contact pressure gauge. After the relay KV1 is energized, its normally open contact 1KV2 is closed, the second branch is connected, and the contactor KM is energized. , the normally open contact KM3 is closed, the branch where the contact switch YX2 is located is on standby, the normally closed contact KM4 is disconnected, the stop indicator light LD1 is off, the normally open contact KM5 is closed, the start indicator light LD2 is on, and the normally open contact KM0 Closed, the motor starts to operate normally, and can also be started by the experimental button SB;

When the pressure of the motor is too large, the contact switch YX2 of the electric contact pressure gauge connects the contact P and the contact P2. After the relay 2KV is energized, the normally closed contact 2KV-1 on the second branch is disconnected, and the contactor KM Open, the normally open contact KM0 is disconnected, the motor stops operating, the normally closed contact KM4 is reset and closed, the stop indicator light LD1 is lit, the normally open contact KM5 is reset and disconnected, and the start indicator light LD2 is off;

When any of the normally closed temperature control switch KSD1, normally closed temperature control switch KSD3 and normally closed temperature control switch KSD5 installed in the motor is disconnected due to the detection of excessive temperature in the motor, the second branch will be disconnected. Open, the contactor KM is disconnected, the normally open contact KM0 is reset and disconnected, the motor stops operating, the normally closed contact KM4 is reset and closed, the stop indicator light LD1 is lit, the normally open contact KM5 is reset and disconnected, and the start indicator light LD2 is off ;

When any one of the normally open temperature control switch KSD2, normally open temperature control switch KSD4 and normally open temperature control switch KSD6 installed in the motor is closed due to the detection of excessive temperature in the motor, the third branch is connected and the branch When the excitation trip coil QA is energized, the normally closed contact QA1 is disconnected and the power is cut off, the motor stops running, the normally closed contact KM4 is reset and closed, the stop indicator light LD1 is lit, the normally open contact KM5 is reset and disconnected, and the start prompt Lamp LD2 goes out.

In the present invention, the normally closed temperature control switch KSD1, the normally closed temperature control switch KSD3 and the normally closed temperature control switch KSD5, the normally open temperature control switch KSD2, the normally open temperature control switch KSD4 and the normally open temperature control switch KSD6 are selected at the temperature control point The time should be the same, avoiding that when the protection circuit is not the L phase of the protection circuit due to the lack of phase, there will be a problem that after the protection circuit is disconnected, when the temperature drops to a certain temperature, the protection circuit will continue to work due to insufficient air pressure or oil pressure of the working circuit , but due to the repeated start of the fault circuit due to the lack of phase, the power supply of the main circuit motor M cannot be cut off.

The normally closed contact QA1 of the shunt tripping coil QA can also be a release, and the release mode is □+3340, which is a backup protection for a phase loss fault when the temperature rises. Jump directly to the circuit breaker and cut off the faulty power supply. Avoid repeated starting of the motor.

Claims (3)

1. a motor automatic protecting control device, is characterized in that: comprise the first branch road, the second branch road and the 3rd branch road that are connected between power supply U phase and power supply W phase;

Described first route forms from contact P, contact-making switch YX1, contact P1, the relay 1KV of electro connecting pressure gauge and the normally-closed contact KM1 of contactor KM of the electro connecting pressure gauge that power supply U is connected in series mutually successively, be connected to power supply W phase, the contact P of wherein said electro connecting pressure gauge also is serially connected with contact P2, the relay 2KV of contact-making switch YX2, electro connecting pressure gauge and the normally opened contact KM3 of contactor KM in addition successively, is connected to power supply W phase;

Experiment button SB, the stop button SA of serial connection, the normally-closed contact 2KV1 of contactor KM, relay 2KV, normally closed temperature detect switch (TDS) KSD1, normally closed temperature detect switch (TDS) KSD3 and normally closed temperature detect switch (TDS) KSD5 form described second route successively mutually from power supply U, be connected to power supply W phase, wherein said experiment button SB be parallel with contactor KM normally opened contact KM2, be parallel with the normally opened contact 1KV2 of relay 1KV;

Described the 3rd route power supply U mutually successively the shunt opening breaking coil QA of serial connection and Chang Kai thermostat KSD2 form, the wherein said thermostat KSD2 that often opens is parallel with and often opens thermostat KSD4, is parallel with and often opens thermostat KSD6;

There are the normally-closed contact QA1 of shunt opening breaking coil QA and the normally opened contact KM0 of relay K M to be serially connected on the power line of motor;

Described normally closed temperature detect switch (TDS) KSD1 and Chang Kai temperature detect switch (TDS) KSD2 are installed on the U phase stator coil of motor, described normally closed temperature detect switch (TDS) KSD3 and Chang Kai temperature detect switch (TDS) KSD4 are installed on the V phase stator coil of motor, and described normally closed temperature detect switch (TDS) KSD5 and Chang Kai temperature detect switch (TDS) KSD6 are installed on the W phase stator coil of motor.

2. a kind of motor automatic protecting control device according to claim 1 is characterized in that: this device also comprises and is connected to power supply U phase and power supply W the 4th branch road and the 5th branch road between mutually, comprises and is connected to power supply V phase and power supply W the 6th branch road between mutually;

Described the 4th route, from the power supply U normally-closed contact KM4 of the relay K M of serial connection and stop warning light LD1 and form successively mutually, is connected to power supply W phase;

Described the 5th route forms from normally opened contact KM5 and the startup warning light LD2 of the relay K M that power supply U is connected in series mutually successively, is connected to power supply W phase;

Described the 6th route forms from normally opened contact KM0 and the work warning light HD of the relay K M that power supply V is connected in series mutually successively, is connected to power supply W phase.

3. a kind of motor automatic protecting control device according to claim 1 is characterized in that: described normally closed temperature detect switch (TDS) KSD1, often open temperature detect switch (TDS) KSD2, normally closed temperature detect switch (TDS) KSD3, often open temperature detect switch (TDS) KSD4, normally closed temperature detect switch (TDS) KSD5 and Chang Kai temperature detect switch (TDS) KSD6 and be KSD9700 type temperature detect switch (TDS).

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