阅读说明：本技术 一种电机软启动电路 (Motor soft start circuit ) 是由 刘宝生 卢奇锋 于 2021-08-26 设计创作，主要内容包括：本申请涉及一种电机软启动电路,包括三相电机绕组,三相电机绕组具有三个连接端,还包括：分压模块,耦接于三相电机绕组,以降低三相电机绕组连接端上的电压；通断模块,与分压模块、短接模块串联,用于控制分压模块、短接模块开启或关闭；以及短接模块,与分压模块并联,用于将分压模块短路。分压模块包括第一电阻R1、第二电阻R2以及第三电阻R3,三个连接端分别为第一连接端、第二连接端以及第三连接端,短接模块耦接有用于控制自身通断的控制模块。通过设置分压模块、短接模块,本申请能够减少电机启动时转子受到的作用力；此外本申请能够减少电机启动时,三相电机绕组上的电流,使得三相电机绕组不易因电流过大发热损坏。(The application relates to a soft start circuit of motor, including three-phase machine winding, three-phase machine winding has three link, still includes: the voltage division module is coupled to the three-phase motor winding to reduce the voltage on the connecting end of the three-phase motor winding; the on-off module is connected with the voltage division module and the short-circuit module in series and is used for controlling the voltage division module and the short-circuit module to be opened or closed; and the short-circuit module is connected with the voltage division module in parallel and is used for short-circuiting the voltage division module. The voltage division module comprises a first resistor R1, a second resistor R2 and a third resistor R3, the three connecting ends are a first connecting end, a second connecting end and a third connecting end respectively, and the short-circuit module is coupled with a control module for controlling the on-off of the short-circuit module. By arranging the voltage division module and the short-circuit module, the application can reduce the acting force on the rotor when the motor is started; in addition, when the motor is started, the current on the three-phase motor winding can be reduced, so that the three-phase motor winding is not easy to generate heat and damage due to overlarge current.)

1. The utility model provides a motor soft start circuit, includes three-phase motor winding (1), three-phase motor winding (1) has three link, its characterized in that still includes:

the voltage division module (2) is coupled to the three-phase motor winding (1) so as to reduce the voltage on the connecting end of the three-phase motor winding (1); and the number of the first and second groups,

and the short-circuit module (3) is connected with the voltage division module (2) in parallel and is used for short-circuiting the voltage division module (2).

2. A motor soft start circuit according to claim 1, wherein: the voltage division module (2) comprises a first resistor R1, a second resistor R2 and a third resistor R3, the three connecting ends are respectively a first connecting end, a second connecting end and a third connecting end, one end of the first resistor R1 is coupled with the first connecting end, the other end of the first resistor R1 is connected with a three-phase power supply, one end of the second resistor R2 is coupled with the second connecting end, the other end of the second resistor R2 is connected with the three-phase power supply, and one end of the third resistor R3 is coupled with the third connecting end, and the other end of the third resistor R3 is connected with the three-phase power supply.

3. A motor soft start circuit according to claim 2, wherein: the first resistor R1, the second resistor R2 and the third resistor R3 all adopt heating wires.

4. A motor soft start circuit according to claim 1, wherein: the voltage division module (2) adopts a three-phase starting motor, a starting circuit of the three-phase starting motor is provided with a first terminal U1, a second terminal U2, a third terminal V1, a fourth terminal V2, a fifth terminal W1 and a sixth terminal W1, the first terminal U1, the third terminal V1 and the fifth terminal W1 are respectively coupled to different connecting terminals, and the second terminal U2, the fourth terminal V2 and the sixth terminal W2 are connected with a three-phase power supply.

5. A motor soft start circuit according to claim 1, wherein: the short circuit module (3) is a circuit breaker QF0, three output ends of the short circuit module (3) are respectively coupled with three connecting ends, and three input ends of the short circuit module (3) are connected with a three-phase power supply.

6. A motor soft start circuit according to claim 1, wherein: the short circuit module (3) adopts a time delay starting relay, three output ends of the short circuit module (3) are respectively coupled with three connecting ends, and three input ends of the short circuit module (3) are connected with a three-phase power supply.

7. The motor soft start circuit of claim 1, further comprising:

the on-off module (4) is connected with the voltage division module (2) and the short-circuit module (3) in series and used for controlling the voltage division module (2) and the short-circuit module (3) to be opened or closed.

8. The soft start circuit for an electric motor of claim, wherein: and a control module (5) for controlling the on-off of the short-circuit module (3) is coupled to the short-circuit module.

Technical Field

The application relates to the field of motor circuits, in particular to a motor soft start circuit.

Background

The motor is an electromagnetic device for realizing electric energy conversion or transmission according to an electromagnetic induction law. The main function of the device is to convert mechanical energy into electric energy to generate driving torque as a power source for electrical appliances or various machines.

In view of the above related technologies, when the motor is powered on, the rotor of the motor may be gradually increased from 0 rpm to a very fast rpm, and particularly, in some motors with high power, the rotor of the motor may receive a large impact force at the moment of starting, which may easily cause damage to the motor.

Disclosure of Invention

In order to reduce the impact force when the high-power motor is started, the application provides a motor soft start circuit.

The application provides a motor soft start circuit adopts following technical scheme.

The utility model provides a soft start circuit of motor, includes three-phase motor winding, three-phase motor winding has three link, still includes:

the voltage division module is coupled to the three-phase motor winding so as to reduce the voltage on the connecting end of the three-phase motor winding; and the number of the first and second groups,

and the short-circuit module is connected with the voltage division module in parallel and is used for short-circuiting the voltage division module.

Through adopting above-mentioned technical scheme, reduce the voltage when three-phase motor winding starts through the voltage division module, the magnetic field force that acts on the rotor after voltage reduction makes three-phase motor winding circular telegram reduces, make electric motor rotor rotational acceleration reduce, thereby the impact force that receives when making the motor start reduces, after reaching certain rotational speed value, the rethread short circuit module, open circuit the voltage division module, make the voltage recovery at three-phase motor winding both ends normal, make the motor normally do work to equipment, use this soft start circuit to make the motor just circular telegram the time simultaneously, the voltage of three-phase motor winding reduces, make the electric current through on the three-phase motor winding also reduce, make the three-phase motor winding be difficult for because of the damage that generates heat greatly of the electric current.

Preferably, the voltage dividing module includes a first resistor R1, a second resistor R2, and a third resistor R3, three of the connection terminals are a first connection terminal, a second connection terminal, and a third connection terminal, one end of the first resistor R1 is coupled to the first connection terminal, and the other end is connected to the three-phase power supply, one end of the second resistor R2 is coupled to the second connection terminal, and the other end is connected to the three-phase power supply, and one end of the third resistor R3 is coupled to the third connection terminal, and the other end is connected to the three-phase power supply.

Through adopting above-mentioned technical scheme, divide voltage to three-phase motor winding through first resistance R1, second resistance R2 and third resistance R3 for the voltage that three-phase power acted on three-phase motor winding tip reduces, realizes stepping down.

Preferably, the first resistor R1, the second resistor R2 and the third resistor R3 are all heating wires.

By adopting the technical scheme, the electric heating wire is wide in obtaining way, low in cost and large in model number, the actual use requirement is easily met, the electric heating wire is usually spiral and has inductance property, and after the electric heating wire is electrified, the resistance value of the electric heating wire can be gradually reduced, so that the force acting on a static motor rotor when the motor starts to be started is further reduced.

Preferably, the voltage dividing module adopts a three-phase starting motor, a starting circuit of the three-phase starting motor has a first terminal U1, a second terminal U2, a third terminal V1, a fourth terminal V2, a fifth terminal W1 and a sixth terminal W1, the first terminal U1, the third terminal V1 and the fifth terminal W1 are respectively coupled to different connecting terminals, and the second terminal U2, the fourth terminal V2 and the sixth terminal W2 are connected with a three-phase power supply.

Through adopting above-mentioned technical scheme, replace inductance coupling to the connecting terminal through the three winding with another motor on for voltage on two connecting terminals of three-phase machine winding can increase the increase after the motor starts, and the winding of motor has certain resistance simultaneously, can further reduce the starting voltage of motor, all has standby motor on the production line in the actual production simultaneously, and it is comparatively convenient to draw materials.

Preferably, the short circuit module is a circuit breaker QF0, three output ends of the short circuit module are respectively coupled with three connecting ends, and three input ends of the short circuit module are connected with a three-phase power supply.

Through adopting above-mentioned technical scheme, through personnel manual close the circuit breaker QF0 floodgate with the direct and three-phase motor winding intercommunication of three-phase power with the partial pressure module short circuit, make the partial pressure module be difficult for meeting electric heat production too much and damaging because of long-term.

Preferably, the short circuit module adopts a delay starting relay, three output ends of the short circuit module are respectively coupled with three connecting ends, and three input ends of the short circuit module are connected with a three-phase power supply.

By adopting the technical scheme, the delay starting relay can automatically short the voltage division module within a specific time after being electrified, and the motor can normally run after the rotor normally rotates.

Preferably, the method further comprises the following steps:

and the on-off module is connected with the voltage division module and the short-circuit module in series and is used for controlling the voltage division module and the short-circuit module to be opened or closed.

Through adopting above-mentioned technical scheme, the setting of break-make module, the personnel of being convenient for control this soft start circuit open and close.

Preferably, a control module for controlling the on-off of the short-circuit module is coupled to the short-circuit module.

Through adopting above-mentioned technical scheme, when motor output shaft is empty, personnel can reduce the electric current on the three-phase motor winding through control module with the short circuit module disconnection to reduce energy loss, comparatively energy-conserving.

In summary, the present application includes at least one of the following beneficial technical effects:

by arranging the voltage division module and the short-circuit module, the application can reduce the acting force on the rotor when the motor is started;

this application can reduce when the motor starts, the electric current on the three-phase motor winding for the three-phase motor winding is difficult because of the too big damage that generates heat of electric current.

Drawings

Fig. 1 is a circuit diagram of a soft start circuit of a motor according to embodiment 1 of the present application.

Fig. 2 is a circuit diagram of a soft start circuit of a motor according to embodiment 2 of the present application.

Fig. 3 is a circuit diagram of a soft start circuit of a motor according to embodiment 3 of the present application.

Fig. 4 is a circuit diagram of a soft start circuit of a motor according to embodiment 4 of the present application.

Fig. 5 is a circuit diagram of a soft start circuit of a motor according to embodiment 5 of the present application.

Fig. 6 is a circuit diagram of a soft start circuit of a motor according to embodiment 6 of the present application.

Fig. 7 is a circuit diagram of a soft start circuit of a motor according to embodiment 7 of the present application.

Fig. 8 is a circuit diagram of a soft start circuit of a motor according to embodiment 8 of the present application.

Description of reference numerals: 1. a three-phase motor winding; 2. a voltage division module; 3. a short-circuit module; 4. a switching module; 5. and a control module.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses a motor soft start circuit.

Example 1:

referring to fig. 1, a soft start circuit of a motor includes a three-phase motor winding 1, a voltage division module 2, a short-circuit module 3, and an on-off module 4. The voltage division module 2 is coupled with the three-phase motor winding 1, and the short-circuit module 3 is connected with the voltage division module 2 in parallel. The on-off module 4 is coupled to the voltage division module 2, and the other end of the on-off module 4 is connected with an external three-phase power supply to provide voltage for the voltage division module 2 and the three-phase motor winding 1.

In this embodiment, the three-phase motor winding 1 adopts a star connection method, and the three-phase motor winding 1 has three connection ends, namely a first connection end, a second connection end and a third connection end.

The voltage dividing module 2 includes a first resistor R1, a second resistor R2, and a third resistor R3, an output terminal of the first resistor R1 is coupled to the first connection terminal, an output terminal of the second resistor R2 is coupled to the second connection terminal, an output terminal of the third resistor R3 is coupled to the third connection terminal, input terminals of the first resistor R1, the second resistor R2, and the third resistor R3 are coupled to the on-off module 4, in this embodiment, the first resistor R1, the second resistor R2, and the third resistor R3 are replaced by heating wires, which have multiple specifications, and people can easily find a heating wire matching the power of the motor, in addition, the heating wire in this embodiment is spiral so that the heating wire has inductance characteristic, and the heating wire is charged first after being electrified, and at this time, the heating wire has higher resistance value, in the process from the beginning of charging to the completion of charging, the resistance value of the heating wire is gradually reduced to the original resistance value.

First resistance R1, the setting of second resistance R2 and third resistance R3 can carry out the partial pressure to the looks voltage of three-phase motor winding 1, every voltage value that makes three-phase motor winding 1 after the motor circular telegram reduces, thereby reduce the intensity of the inside rotating magnetic field of motor, thereby when reducing the motor and beginning to circular telegram, the impetus that acts on the rotor, make the rotor be difficult when the motor starts, receive great power and other structures of motor inside to take place to strike and cause the motor to damage, the reduction of voltage can make the current reduction in the three-phase motor winding 1 simultaneously, thereby the instantaneous current that produces when making the motor start is difficult to burn out three-phase motor winding 1.

The on-off module 4 adopts a breaker QF2, three output ends of the breaker QF2 are respectively coupled with input ends of a first resistor R1, a second resistor R2 and a third resistor R3 in a one-to-one correspondence manner, and three input ends of the breaker QF2 are used for connecting a three-phase alternating-current power supply.

The short-circuit module 3 is used for short-circuiting the voltage dividing module 2. In this embodiment, the short-circuit module 3 adopts a delay start relay. The short-circuit module 3 has three output terminals, three input terminals and a relay coil KT, and delays the start relay. One end of the relay coil KT is coupled to a connection point between the second resistor R2 and the second connection end, and the other end is coupled to a connection point between the first resistor R1 and the output end of the on-off module 4. Three output ends of the short-circuit module 3 are respectively coupled with output ends of a first resistor R1, a second resistor R2 and a third resistor R3 in a one-to-one correspondence manner, the short-circuit module 3 is further coupled with a control module 5 for controlling on-off of the short-circuit module, the control module 5 adopts a circuit breaker QF1, three output ends of the control module 5 are respectively coupled with three input ends of the short-circuit module 3 in a one-to-one correspondence manner, and three input ends of the control module 5 are respectively coupled with input ends of a first resistor R1, a second resistor R2 and a third resistor R3 in a one-to-one correspondence manner.

The time delay starting of the short-circuit module 3 enables the short-circuit module to short circuit the first resistor R1, the second resistor R2 and the third resistor R3 when the rotor speed of the motor reaches the maximum, so that the phase voltage of the three-phase motor winding 1 of the motor is recovered to be normal, and the motor can be normally used. In addition, when the personnel need the motor to be in idle load standby, the personnel can break the circuit where the short-circuit module 3 is located through the control module 5, so that the voltage division module 2 is not short-circuited any more, the voltage of the three-phase motor winding 1 is reduced, the electric energy consumed by the motor is reduced, and the energy is saved.

The implementation principle of the embodiment 1 is as follows: after the on-off module 4 and the control module 5 are closed, the voltage division module 2 is switched on, the phase voltage of the three-phase motor winding 1 is divided by the first resistor R1, the second resistor R2 and the third resistor R3, so that each voltage of the three-phase motor winding 1 is reduced, the strength of a rotating magnetic field in the motor and the value of current are reduced, the acting force applied to a motor rotor is reduced, the motor is not easy to be damaged by impact, and meanwhile, the motor is not easy to be damaged by overheating.

Example 2:

the present embodiment is different from embodiment 1 in that: referring to fig. 2, the short-circuit module 3 employs a circuit breaker QF0, the circuit breaker QF0 also has three output terminals and three input terminals, the three output terminals of the short-circuit module 3 are respectively coupled to the output terminals of the first resistor R1, the second resistor R2 and the third resistor R3 in a one-to-one correspondence manner, and the three output terminals of the short-circuit module 3 are respectively coupled to the three output terminals of the control module 5 in a one-to-one correspondence manner.

Example 3:

the present embodiment is different from embodiment 1 in that: referring to fig. 3, the voltage divider module 2 employs a three-phase starter motor, which is known to have six terminals, positioned: a first terminal U1, a second terminal U2, a third terminal V1, a fourth terminal V2, a fifth terminal W1 and a sixth terminal W2, wherein the first terminal U1 and the second terminal U2 are led out from two ends of a motor winding coil L1; the third terminal V1 and the fourth terminal V2 are led out from two ends of the motor winding coil L2, and the fifth terminal W1 and the sixth terminal W2 are also led out from two ends of the motor winding coil L3. The first terminal U1, the third terminal V1, and the fifth terminal W1 are coupled to the first connection terminal, the second connection terminal, and the third connection terminal, respectively, in a one-to-one coupling manner, and the second terminal U2, the fourth terminal V2, and the sixth terminal W2 are coupled to three output terminals of the on-off module 4, respectively.

Because the winding coil inside the motor also has certain resistance, and also has the inductance characteristic, can regard as partial pressure module 2, generally have the same stand-by motor of power on a production line, regard as partial pressure module 2 with stand-by motor, it is comparatively convenient to draw materials.

Example 4:

the present embodiment is different from embodiment 1 in that: referring to fig. 4, the three-phase motor winding 1 of the present embodiment adopts delta connection.

Example 5:

the present embodiment is different from embodiment 2 in that: referring to fig. 5, the three-phase motor winding 1 of the present embodiment adopts delta connection.

Example 6:

the present embodiment is different from embodiment 3 in that: referring to fig. 6, the three-phase motor winding 1 of the present embodiment adopts delta connection.

Example 7:

the present embodiment is different from embodiment 3 in that: referring to fig. 7, the number of the voltage dividing modules 2 is 4, four voltage dividing modules 2 are connected in parallel, a circuit breaker QF3 is connected between every two voltage dividing modules 2 in series, and three circuit breakers QF3 are arranged corresponding to the voltage dividing modules 2. Personnel can close corresponding circuit breaker QF3 according to actual conditions and insert this circuit with the partial pressure module 2 of corresponding quantity to carry out the partial pressure to three-phase motor winding.

Example 8:

this embodiment is different from embodiment 7 in that: referring to fig. 8, the three-phase motor winding 1 of the present embodiment adopts delta connection.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.