Servo system and protection method for reducing power grid impact and providing runaway protection

Abstract

Disclosed in the present invention are a servo system and protection method for reducing power grid impact and providing runaway protection in the field of presses. The servo system comprises an air circuit breaker QF, wherein the air circuit breaker QF is connected to an alternating-current contactor KM1, the alternating-current contactor KM1 is connected to a filter reactor unit, the filter reactor is connected to a conversion unit, the conversion unit is connected to a brake protection unit, the brake protection unit is connected to a servo motor M1, and the servo motor M1 is connected to an electromagnetic brake and an air-cooled motor. The alternating-current contactor component, the filter reactor unit and the conversion unit are used, such that, by means of charging and discharging processes, power consumption caused by the instantaneous high torque of the servo motor can be reduced, thereby ensuring the stability of a factory power grid voltage. In addition, the brake protection unit is added; therefore, when the servo motor is out of control or experiences runaway, the voltage generated by the servo motor is dissipated, such that the servo motor stops operating within a safe time period. The method can be reused multiple times and does not cause air pollution in working environments.

Description

Servo system and protection method for reducing power grid impact and out-of-control protection TECHNICAL FIELD

[0001] The present application relates to a servo system and protection method for reducing power grid impact and out-of-control protection in the field of presses. BACKGROUND

[0002] At present, when the three-phase servo power supply of the servo press is under full load or overload, the torque of the servo motor becomes large, and the current becomes large, which causes the three-phase power supply of the servo press to instantaneously obtain power from the power grid, thereby lowering the voltage of the factory power grid and causing some devices under the power grid to be unable to be normally used; and when maintenance is needed, the device needs to be stopped, and then more than 10 minutes are waited for the capacitor to release the high voltage before the maintenance can be started. In addition, the flywheel protection of the motor of the servo press usually adopts a friction plate type brake. When the servo motor is out of control or flies, the brake forcibly engages the brake, and controls the servo motor to stop in a short time through the friction plate. Since the energy of the flywheel is large, the friction plate engages the brake once, and there is a large wear, which needs to be updated in time, and a large amount of friction plate powder is released into the air, which pollutes the working environment. SUMMARY

[0003] The purpose of the present application is to provide a servo system and protection method for reducing power grid impact and out-of-control protection, reducing the power consumption of the large torque of the servo motor in an instant, ensuring the stability of the voltage of the factory power grid, and stopping the servo motor in a safe time, which can be repeatedly used for many times and does not pollute the air in the working environment.

[0004] To achieve the above purpose, the present application provides a servo system and protection method for reducing power grid impact and out-of-control protection, which comprises an air switch QF, the air switch QF is connected with an alternating current contactor KM1, the alternating current contactor KM1 is connected with a filter reactance unit, the filter reactance is connected with a conversion unit, the conversion unit is connected with a brake protection unit, the brake protection unit is connected with a servo motor M1, and the servo motor M1 is connected with an electromagnetic brake and an air-cooled motor.

[0005] Compared with the prior art, the servo system and protection method for reducing power grid impact and out-of-control protection has the beneficial effects that the alternating current contactor element, the filter reactance unit and the conversion unit can reduce the power consumption of the large torque of the servo motor in an instant through the charging and discharging process, ensure the stability of the voltage of the factory power grid, and increase the brake protection unit. When the servo motor is out of control or flies, the voltage consumption generated by the servo motor is stopped in a safe time, and this method can be repeatedly used for many times and does not pollute the air in the working environment.

[0006] As a further improvement of the present application, the filter reactance unit comprises a filter, an input end of the filter being connected with the AC contactor KM1, an output end of the filter being connected with the electric reactor and the conversion unit respectively, and the electric reactor is also connected with the conversion unit.

[0007] In this way, the filter is used for effectively filtering at a specific frequency, and the signal is improved in anti-interference performance; the electric reactor prevents interference from the power grid, thereby improving the anti-interference performance of the three-phase power supply.

[0008] As a further improvement of the present application, the conversion unit comprises a front-end controller, the front-end controller being connected with the filter, the electric reactor and the PLC respectively, a DC+ end of the front-end controller being connected with one end of a DC switch KA30, a DC- end of the front-end controller being connected with a DC- end of the battery module, the other end of the DC switch KA30 being connected with one end of a DC switch KA31, the other end of the DC switch KA31 being connected with a DC+ end of the battery module, the two ends of the DC switch KA31 being connected with a charging resistor in parallel, the other end of the DC switch KA31 being connected with one end of a DC switch KA32, the other end of the DC switch KA32 being connected with one end of a discharging resistor, the other end of the discharging resistor being connected with the DC- end of the battery module, the DC+ end and the DC- end of the battery module being further connected with a DC+ end and a DC- end of a voltage detection board respectively, and the DC switch KA30 and the DC switch KA31 are both normally open types.

[0009] In this way, the front-end controller is used for converting three-phase AC power into DC high-voltage power, and has functions of fault signal detection, power supply detection data Ethernet communication, etc., and the battery module ensures the stable working power supply of the servo driver, does not lower the voltage of the factory power grid, and does not cause power supply failure of other equipment

[0010] As a further improvement of the present application, the brake protection unit comprises a driver, a DC+ end and a DC- end of the driver being connected with a DC+ end and a DC- end of the battery module respectively, an ST01 end and an ST02 end of the driver being connected with a normally closed switch KA15, the normally closed switch KA15 being connected with a positive electrode of a DC 24V power supply, a negative electrode of the DC 24V power supply being connected with an SCM1 end and an SCM2 end of the driver respectively, a PE end, an MC01 end, an ACM end, an AVI end and an AFN2 end of the driver being connected with the motor M1, a U end, a V end and a W end of the driver being connected with the motor M1 through a magnetic ring, and an energy control unit being arranged between the magnetic ring and the motor M1.

[0011] In this way, the driver provides the required voltage and current for the servo motor, and cooperates with the energy control unit to quickly consume the residual voltage in the servo motor, so that rapid brake shutdown is realized.

[0012] As a further improvement of the present application, the energy control unit comprises a brake contactor KM2, which is a normally closed contact, three terminals of the brake contactor KM2 are connected with U, V and W terminals of the driver respectively, and the other three terminals of the brake contactor KM2 are connected with output terminals of the energy feedback module, and input terminals of the energy feedback module are connected with the three-phase power grid of the user.

[0013] Therefore, when the servo motor is abnormally uncontrolled or suddenly powered off, the servo driver stops controlling, the brake contactor coil is disconnected, the normally closed contact is turned on, the energy feedback module is started, and the residual voltage in the servo motor is quickly consumed, so that the motor can be completely stopped within 1S.

[0014] In order to achieve the above-mentioned purpose, the present application further provides a protection method for reducing power grid impact and out-of-control protection, S1, protection of the three-phase power supply; S2, charging protection; S3, brake protection.

[0015] As a further improvement of the present application, the protection of the three-phase power supply specifically includes the following contents,

[0016] The AC contactor is located in the first link of the three-phase power supply, and is used for short-circuit and over-current protection of the three-phase power supply; the AC contactor is located in the second link, and is used for on-off control of the three-phase power supply; the filter is located in the third link, and is used for specific frequency filtering to improve the anti-interference performance of the signal; the electric reactor is located in the fourth link, and is used for preventing interference from the power grid; and the front-end controller AFE is located in the fifth link, and is used for converting three-phase AC power into DC high-voltage power, and has the functions of fault signal detection, power supply detection data Ethernet communication.

[0017] As a further improvement of the present application, the charging protection specifically includes the following contents,

[0018] The DC switch KA30 is located in the first link of the DC bus voltage output DC+ of the front-end controller AFE, and the main contact is a normally open type, which is used for starting control of the DC bus voltage charging; after the power supply of the device is turned on, the front-end controller AFE converts three-phase AC power into DC power, and controls the DC switch KA30 to be closed through a PLC logic program; the charging resistor is located in the second link of the DC bus voltage output DC+ of the front-end controller AFE, and is used for initial charging protection; the charging resistor is connected to the terminal DC+ of the battery module, and the DC voltage DC470V; after initial power-on, the DC bus voltage value of the front-end controller AFE is high, and the charging resistor loop is connected to the battery module, so that the battery module can be prevented from being damaged due to the excessively high voltage in the power-on instant.

[0019] The DC switch KA31 is located at the second link of the DC bus voltage output DC+ of the front-end controller AFE, the main contact is normally open, and is used for charging progress control; the DC switch KA30 terminal to the DC switch KA31 terminal, the DC switch KA31 terminal to the battery module terminal DC+, when the detected DC voltage reaches 530V, the DC switch KA31 is turned on through the PLC logic program control, the DC switch KA30 terminal, avoids the charging resistor, directly charges, accelerates the charging speed of the battery module, and quickly prepares the power required for the servo driver to work; when the detected DC voltage reaches the rated voltage of the servo driver, the servo press can start stamping.

[0020] As a further improvement of the application, the charging protection further comprises the following contents,

[0021] The front-end controller AFE DC bus voltage output DC- to the battery module terminal DC+, forms a DC positive and negative charging circuit with DC+; the DC switch KA32 is located at the third link of the DC bus voltage DC+ of the front-end controller AFE, the main contact is normally closed, and is used for the discharge circuit of the DC bus voltage; the battery module terminal DC+ to the DC switch KA32 terminal; the discharge resistor is located at the fourth link of the DC bus voltage DC+ of the front-end controller AFE, the DC switch KA32 terminal to the discharge resistor R3 terminal, and the discharge resistor terminal to the battery module terminal DC-; when the equipment stops working and the power is cut off, the DC switch KA32 is normally closed and conducts, the voltage in the battery module is quickly discharged through the discharge resistor, which is convenient for later equipment safety maintenance, and the DC switches KA30 and KA31 are closed at the same time.

[0022] As a further improvement of the application, the brake protection comprises the following specific contents,

[0023] When the servo press is normally powered on, the brake contactor is turned on through the PLC logic program control, the main contact is disconnected, the energy feedback module is started, and the press normally works; when the servo motor is abnormally uncontrolled or suddenly powered off, the servo driver stops control, the brake contactor coil is disconnected, the normally closed contact is conducted, the energy feedback module is started, and the residual voltage in the servo motor is quickly consumed, so that the motor is completely stopped in 1S.

[0024] Compared with the prior art, the servo drive front-end power supply circuit of the application adds front-end controller, DC switch, charge and discharge detection, battery module and voltage detection board elements in addition to the use of electric reactor, filter, AC contactor elements. The battery module can reduce the instantaneous large torque power consumption of the servo motor through the charge and discharge process, and ensure the stability of the factory power grid voltage. The servo drive to the servo motor three-phase circuit adds a brake contactor and an energy feedback module. When the servo motor is not controlled or out of control, the brake contactor works, and the energy feedback module starts, and the voltage generated by the servo motor is converted through the feedback module and returned to the internal power grid of the factory, ensuring that the servo motor stops running within the safety time. Since the brake only realizes the mechanical brake function, the normal wear of the friction plate is small. This method can be reused multiple times and does not cause air pollution to the working environment. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a power principle diagram of the application.

[0026] Fig. 2 is a control principle diagram of the application. DETAILED DESCRIPTION

[0027] The application will be further described below in conjunction with the drawings:

[0028] A servo system for reducing power grid impact and out-of-control protection as shown in Figs. 1-2, comprising an air switch QF, the air switch QF being connected with an AC contactor KM1, the AC contactor KM1 being connected with a filter reactor unit, the filter reactor being connected with a conversion unit, the conversion unit being connected with a brake protection unit, the brake protection unit being connected with a servo motor M1, the servo motor M1 being connected with an electromagnetic brake and a fan-cooled motor.

[0029] The filter reactor unit comprises a filter, the input end of the filter being connected with the AC contactor KM1, the output end of the filter being connected with an electric reactor and a conversion unit respectively, and the electric reactor also being connected with the conversion unit.

[0030] The conversion unit comprises a front-end controller connected with the filter, the reactor and the PLC respectively, the DC+ end of the front-end controller is connected with one end of the DC switch KA30, the DC- end of the front-end controller is connected with the DC- end of the battery module, the other end of the DC switch KA30 is connected with one end of the DC switch KA31, the other end of the DC switch KA31 is connected with the DC+ end of the battery module, the DC switch KA31 has the charging resistor connected in parallel at two ends thereof, the other end of the DC switch KA31 is connected with one end of the DC switch KA32, the other end of the DC switch KA32 is connected with one end of the discharging resistor, the other end of the discharging resistor is connected with the DC- end of the battery module, the DC+ end and the DC- end of the battery module are also connected with the DC+ end and the DC- end of the voltage detection board respectively, and the DC switch KA30 and the DC switch KA31 are both normally open types.

[0031] The brake protection unit comprises a driver, the DC+ end and the DC- end of the driver are connected with the DC+ end and the DC- end of the battery module respectively, the ST01 end and the ST02 end of the driver are connected with the normally closed switch KA15, the normally closed switch KA15 is connected with the positive pole of the DC 24V power supply, the negative pole of the DC 24V power supply is connected with the SCM1 end and the SCM2 end of the driver respectively, the PE end, the MC01 end, the ACM end, the AVI end and the AFN2 end of the driver are connected with the motor M1, the U end, the V end and the W end of the driver are connected with the motor M1 through the magnetic ring, and the energy control unit is arranged between the magnetic ring and the motor M1.

[0032] The energy control unit comprises a brake contactor KM2, the brake contactor KM2 is a normally closed contact, three wiring ends of the brake contactor KM2 are connected with the U end, the V end and the W end of the driver through the magnetic ring respectively, and the other three wiring ends of the brake contactor KM2 are connected with the output end of the energy feedback module, and the input end of the energy feedback module is connected with the user three-phase power grid.

[0033] A protection method for reducing power grid impact and out-of-control protection, as shown in FIGS. 1-2, comprises the following contents,

[0034] S1, protection of the three-phase power supply;

[0035] The AC contactor is located at the first link of the three-phase power supply and is used for three-phase power supply short circuit and overcurrent protection;

[0036] The AC contactor is located at the second link and is used for on-off control of the three-phase power supply;

[0037] The filter is located at the third link and is used for effectively filtering specific frequencies and improving signal anti-interference performance;

[0038] The reactor is located at the fourth link and is used for preventing interference from the power grid;

[0039] The front-end controller AFE is located at the fifth link, and is used for converting three-phase alternating current into direct current high voltage, and has functions of fault signal detection, power detection data Ethernet communication.

[0040] S2, charge protection;

[0041] The direct current switch KA30 is located at the first link of the DC bus voltage output DC+ of the front-end controller AFE, and has a normally open main contact and is used for starting control of charging of the DC bus voltage. After the power supply of the equipment is turned on, the front-end controller AFE converts three-phase alternating current into direct current, and controls the direct current switch KA30 to be closed through a PLC logic program.

[0042] The charging resistor is located at the second link of the DC bus voltage output DC+ of the front-end controller AFE, and is used for initial charge protection. The charging resistor is connected to the battery module terminal DC+, and the direct current voltage DC is 470V. After initial power-on, the DC bus voltage value of the front-end controller AFE is relatively high, and the charging resistor is connected to the battery module through a loop, so that the battery module is prevented from being damaged due to excessively high voltage in the power-on instant.

[0043] The direct current switch KA31 is located at the second link of the DC bus voltage output DC+ of the front-end controller AFE, and has a normally open main contact and is used for charge progress control. The terminal of the direct current switch KA30 is connected to the terminal of the direct current switch KA31, and the terminal of the direct current switch KA31 is connected to the battery module terminal DC+. When it is detected that the direct current voltage reaches DC 530V, the direct current switch KA31 is controlled to be connected through a PLC logic program, so that the terminal of the direct current switch KA30 avoids the charging resistor and directly charges, thereby accelerating the charging speed of the battery module and quickly preparing the power required for the operation of the servo driver. When it is detected that the direct current voltage reaches the rated voltage of the servo driver, the servo press machine can start stamping.

[0044] The charge protection further includes the following contents,

[0045] The DC bus voltage output DC- of the front-end controller AFE is connected to the battery module terminal DC+, and forms a direct current positive and negative charging loop with DC+.

[0046] The direct current switch KA32 is located at the third link of the DC bus voltage DC+ of the front-end controller AFE, and has a normally closed main contact and is used for a discharge loop of the DC bus voltage. The battery module terminal DC+ is connected to the terminal of the direct current switch KA32.

[0047] The discharge resistor is located at the fourth link of the DC bus voltage DC+ of the front-end controller AFE. The terminal of the direct current switch KA32 is connected to the terminal of the discharge resistor R3, and the terminal of the discharge resistor is connected to the battery module terminal DC-. After the equipment stops working and the power supply is turned off, the direct current switch KA32 is normally closed and conducts, and the voltage in the battery module is quickly discharged through the discharge resistor, so that the equipment is facilitated for safety maintenance in the later period, and the direct current switches KA30 and KA31 are simultaneously closed.

[0048] S3, brake protection.

[0049] When the servo press is normally powered on, the brake contactor is turned on through the PLC logic program control, the main contact is disconnected, the energy feedback module is turned on, and the press works normally; when the servo motor is abnormal and uncontrolled or suddenly powered off, the servo driver stops control, the brake contactor coil is disconnected, the normally closed contact is turned on, the energy feedback module is started, and the remaining voltage in the servo motor is quickly consumed to ensure that the motor is completely stopped within 1S.

[0050] In the application, the first link of the alternating current contactor is located in the three-phase power supply, which is used for three-phase power supply short circuit, overcurrent protection and the like; the alternating current contactor is located in the second link, which is used for on-off control of the three-phase power supply; the filter is in the third link, which is used for specific frequency filtering to improve the signal anti-interference performance; the electric reactor is in the fourth link, which prevents interference from the power grid; the front-end controller AFE is in the fifth link, which is used for three-phase alternating current to direct current high voltage conversion, and has functions of fault signal detection, power supply detection data Ethernet communication and the like.

[0051] The direct current switch KA30 is located in the first link of the direct current bus voltage output DC+ of the front-end controller AFE, and the main contact is normally open, which is used for direct current bus voltage charging start control. The direct current bus voltage output DC+ of the front-end controller AFE (U14) is connected to the terminal A (U14) of the direct current switch KA30; the terminal B (U15) of the direct current switch KA30 is connected to the terminal (U15) of the charging resistor A; after the power supply of the equipment is turned on, the three-phase alternating current of the front-end controller AFE is converted into direct current, the direct current switch KA30 is turned on through the PLC logic program control, and the direct current bus voltage output DC+ of the front-end controller AFE (U14) is connected to the terminal (U15) of the charging resistor A.

[0052] The charging resistor R1 is located in the second link of the direct current bus voltage output DC+ of the front-end controller AFE, which is used for initial charging protection. The terminal (U1) of the charging resistor B is connected to the terminal DC+ (U16) of the battery module, and the direct current voltage DC is 470V. After initial power-on, the direct current bus voltage value of the front-end controller AFE is high, and the charging resistor loop is connected to the battery module, so that the battery module is prevented from being damaged due to too high voltage in the power-on moment.

[0053] DC switch KA31 is located in the front-end controller AFE DC bus voltage output DC+ second link, the main contact is normally open, used for charging progress control. DC switch KA30 terminal B (U15) to DC switch KA31 terminal A (U15), DC switch KA31 terminal B (U16) to battery module terminal DC+ (U16). When the detection of DC voltage reaches DC530V, through the PLC logic program control DC switch KA31 on, DC switch KA30 terminal B (U15), bypass charging resistor R1 circuit, direct charging, accelerate the charging speed of the battery module, ready to quickly serve the power required for the drive. When the detection of DC voltage reaches the rated voltage of the servo drive, the servo press can start stamping.

[0054] The front-end controller AFE DC bus voltage output DC- (W14) to the battery module terminal DC+ (W14) forms a DC positive and negative charging circuit with DC+.

[0055] DC switch KA32 is located in the third link of the front-end controller AFE DC bus voltage DC+. The main contact is normally closed, used for the discharge circuit of the bus voltage. Battery module terminal DC+ (U16) to DC switch KA32 terminal A (U17).

[0056] Charging resistor R3 is located in the fourth link of the front-end controller AFE DC bus voltage DC+, DC switch KA32 terminal B (U17) to discharge resistor R3 terminal A (U17), discharge resistor R3 terminal B (W14) to battery module terminal DC-. When the device stops working, the power is cut off, the DC switch KA32 is normally closed and conducts, through the discharge resistor, quickly releases the voltage in the battery module, facilitating the safety inspection of the device later. DC switch KA30, KA31 is closed at the same time.

[0057] The battery module is added to ensure the stability of the power supply of the servo drive, without pulling down the voltage of the factory power grid, and without causing power failure of other equipment. The fast charging and discharging of the battery module is also added, which improves the preparation time of the equipment and saves the maintenance time while ensuring the stability of the power supply of the servo drive.

[0058] The brake contactor is located in the first link of the servo motor brake circuit. Brake contactor terminal A (U1) to servo motor terminal A (U1), brake contactor terminal B (V1) to servo motor terminal B (V1), brake contactor terminal C (W1) to servo motor terminal C (W1), the main contact is normally closed.

[0059] The energy feedback module is located at the second link of the servo motor brake circuit, the terminal U of the energy feedback module is connected to the terminal A (U1) of the brake contactor, the terminal V of the energy feedback module is connected to the terminal B (V1) of the brake contactor, and the terminal W of the energy feedback module is connected to the terminal C (W1) of the brake contactor. The terminal R of the energy feedback module is connected to the user three-phase power grid (internal power grid) 2L1, the terminal S of the energy feedback module is connected to the user three-phase power grid (internal power grid) 2L2, and the terminal T of the energy feedback module is connected to the user three-phase power grid (internal power grid) 2L3.

[0060] When the servo press is normally powered on, the brake contactor is controlled to be turned on through the PLC logic program, the main contact is disconnected, the energy feedback module is disconnected, and the press normally works. When the servo motor is abnormally uncontrolled or suddenly powered off, the servo driver stops control, the brake contactor coil is disconnected, the normally closed contact is turned on, the energy feedback module is started, the remaining voltage output value of the servo motor is output to the user three-phase power grid, and then it is consumed, the brake is directly locked by clicking the mechanical brake, and a large amount of dust is not generated, so that the motor is completely stopped in 1S.

[0061] The battery module of the new energy is adopted, the power consumption of the servo motor instantaneous large torque can be reduced through the charging and discharging process, the stability of the factory power grid voltage is ensured, the preparation time of the equipment is improved and the maintenance time is saved when the battery module increases the rapid charging and discharging control and ensures the stability of the servo driver power supply, the brake contactor and the energy feedback module are added in the three-phase circuit from the servo driver to the servo motor, the brake contactor and the energy feedback module can be repeatedly used, and the working environment is not polluted.

[0062] The application is not limited to the above-mentioned embodiments, and based on the technical solutions of the present application, those skilled in the art can make some substitutions and modifications to some technical features according to the disclosed technical content without creative labor, and these substitutions and modifications are all within the protection scope of the application.

Claims

1. A servo system for reducing grid impact and runaway protection, characterized by, The air switch QF is connected with the AC contactor KM1, the AC contactor KM1 is connected with the filter reactor unit, the filter reactor is connected with the conversion unit, the conversion unit is connected with the brake protection unit, the brake protection unit is connected with the servo motor M1, and the servo motor M1 is connected with the electromagnetic brake and the air-cooled motor.

2. A servo system with reduced grid impact and runaway protection according to claim 1, characterized in that: The filter reactor unit comprises a filter, the input end of the filter is connected with the AC contactor KM1, the output end of the filter is connected with the reactor and the conversion unit respectively, and the reactor is also connected with the conversion unit.

3. A servo system with reduced grid impact and runaway protection according to claim 2, characterized in that: The conversion unit comprises a front-end controller, the front-end controller is connected with the filter, the reactor and the PLC respectively, the DC+ end of the front-end controller is connected with one end of the DC switch KA30, the DC- end of the front-end controller is connected with the DC- end of the battery module, the other end of the DC switch KA30 is connected with one end of the DC switch KA31, the other end of the DC switch KA31 is connected with the DC+ end of the battery module, the two ends of the DC switch KA31 are connected with the charging resistor in parallel, the other end of the DC switch KA31 is connected with one end of the DC switch KA32, the other end of the DC switch KA32 is connected with one end of the discharging resistor, the other end of the discharging resistor is connected with the DC- end of the battery module, the DC+ end and the DC- end of the battery module are also connected with the DC+ end and the DC- end of the voltage detection board respectively, and the DC switch KA30 and the DC switch KA31 are both normally open.

4. A servo system with reduced grid impact and runaway protection according to claim 3, characterized in that: The brake protection unit comprises a driver, the DC+ end and the DC- end of the driver are connected with the DC+ end and the DC- end of the battery module respectively, the ST01 end and the ST02 end of the driver are connected with the normally closed switch KA15, the normally closed switch KA15 is connected with the positive electrode of the DC 24V power supply, the negative electrode of the DC 24V power supply is connected with the SCM1 end and the SCM2 end of the driver respectively, the PE end, the MC01 end, the ACM end, the AVI end and the AFN2 end of the driver are connected with the motor M1, the U end, the V end and the W end of the driver are connected with the motor M1 through a magnetic ring, and the energy control unit is arranged between the magnetic ring and the motor M1.

5. A servo system with reduced grid impact and runaway protection according to claim 4, characterized in that: The energy control unit comprises a brake contactor KM2, the brake contactor KM2 is a normally closed contact, the three wiring ends of the brake contactor KM2 are connected with the U end, the V end and the W end of the driver through the magnetic ring respectively, the other three wiring ends of the brake contactor KM2 are connected with the output end of the energy feedback module, and the input end of the energy feedback module is connected with the three-phase power grid of the user.

6. A method of protection for reducing grid impact and runaway protection, characterized by: The following contents are included, S1, protection of the three-phase power supply; S2, charging protection; S3, brake protection.

7. The method of claim 6, wherein the method further comprises: The protection of the three-phase power supply specifically comprises the following contents, The AC contactor is located at the first link of the three-phase power supply, and is used for three-phase power supply short circuit and overcurrent protection; The AC contactor is located at the second link, and is used for on-off control of the three-phase power supply; The filter is located at the third link, and is used for specific frequency filtering to improve the anti-interference performance of the signal; The reactor is located at the fourth link, and is used for preventing interference from the power grid; The front-end controller AFE is located at the fifth link, and is used for converting three-phase alternating current into direct current high voltage, and has the functions of fault signal detection, power supply detection data Ethernet communication.

8. The method of claim 7, wherein the method further comprises: The specific content of the charging protection is as follows, The direct current switch KA30 is located at the first link of the DC bus voltage output DC+ of the front-end controller AFE, the main contact is normally open, and is used for starting control of the DC bus voltage charging; after the power supply of the equipment is turned on, the front-end controller AFE converts three-phase alternating current into direct current, and controls the closing of the direct current switch KA30 through a PLC logic program; The charging resistor is located at the second link of the DC bus voltage output DC+ of the front-end controller AFE, and is used for initial charging protection; the charging resistor is connected to the battery module terminal DC+, and the direct current voltage DC is 470V; after initial power-on, the DC bus voltage value of the front-end controller AFE is relatively high, and the charging resistor loop is connected to the battery module, so that the battery module is prevented from being damaged due to excessively high voltage in the power-on instant; The direct current switch KA31 is located at the second link of the DC bus voltage output DC+ of the front-end controller AFE, the main contact is normally open, and is used for charging progress control; The terminal of the direct current switch KA30 is connected to the terminal of the direct current switch KA31, and the terminal of the direct current switch KA31 is connected to the battery module terminal DC+; when it is detected that the direct current voltage reaches DC 530V, the direct current switch KA31 is turned on through a PLC logic program, and the terminal of the direct current switch KA30 is avoided to bypass the charging resistor and directly charge, so as to accelerate the charging speed of the battery module and quickly prepare the power required for the operation of the servo driver; when it is detected that the direct current voltage reaches the rated voltage of the servo driver, the servo press can start stamping.

9. The method of claim 8, wherein the method further comprises: The charging protection further includes the following content, The DC bus voltage output DC- of the front-end controller AFE is connected to the battery module terminal DC+, and forms a direct current positive and negative charging loop with DC+; The direct current switch KA32 is located at the third link of the DC bus voltage DC+ of the front-end controller AFE, the main contact is normally closed, and is used for a discharge loop of the DC bus voltage; the battery module terminal DC+ is connected to the terminal of the direct current switch KA32; The discharge resistor is located at the fourth link of the DC bus voltage DC+ of the front-end controller AFE, the terminal of the direct current switch KA32 is connected to the terminal of the discharge resistor R3, and the terminal of the discharge resistor is connected to the battery module terminal DC-; When the equipment stops working and the power supply is turned off, the normally closed direct current switch KA32 is turned on, the battery module voltage is quickly discharged through the discharge resistor, which is convenient for later safety maintenance of the equipment, and the direct current switches KA30 and KA31 are simultaneously turned off.

10. The method of claim 9, wherein the method further comprises: The specific content of the brake protection is as follows, When the servo press is normally powered on, the brake contactor is turned on through a PLC logic program, the main contact is disconnected, the energy feedback module is started, and the press normally works; when the servo motor is abnormally uncontrolled or suddenly powered off, the servo driver stops control, the brake contactor coil is disconnected, the normally closed contact is turned on, the energy feedback module is started, and the residual voltage in the servo motor is quickly consumed, so that the motor is completely stopped within 1S.

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