Active energy recovery device for double-motor twin trawling

Abstract

The utility model discloses an active energy recovery device for double-motor twin trawling, which comprises an AC / DC (alternating current / direct current) inversion device, the input end of the AC / DC inversion device is connected to a three-phase alternating current input line, and the AC / DC inversion device comprises a direct current output end. The number of the DC / AC frequency converter devices is two, and the two DC / AC frequency converter devices are connected in parallel with the DC output end of the AC / DC inversion device. Each DC / AC frequency converter device comprises a three-phase output end. The number of the motors is two, the power connection ends of the two motors are connected with the three-phase output ends of the two DC / AC frequency converter devices respectively, the output shafts of the two motors are oppositely dragged through a butt joint device, and one motor with the small torque in the two motors supplies power to the other DC / AC frequency converter device through the correspondingly connected DC / AC frequency converter device. The device can realize electric quantity recovery and reduce energy waste.

Description

Technical Field

[0001] This utility model relates to an active energy recovery device with dual motors for mutual towing. Background Technology

[0002] There are generally two methods for powering motor-to-motor systems: one is to use a series load resistor to dissipate the feedback energy, thus reducing the energy consumption in the heat generated by the high-power resistor. This results in a significant energy consumption per test, requiring constant monitoring of the power supply voltage to prevent excessive voltage fluctuations. The other method uses a thyristor active inverter to feed energy back to the grid for energy saving. While this method does achieve energy savings, the current waveform fed back to the grid is a square wave containing numerous high-order harmonics, causing harmonic pollution to the grid. Furthermore, it generates significant electromagnetic noise and has a low grid power factor, resulting in substantial reactive energy loss. Therefore, maximizing energy recovery during motor-to-motor testing remains a crucial technical challenge. Utility Model Content

[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide an active energy recovery device with dual motors for mutual towing, which can realize electricity recovery and reduce energy waste.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a dual-motor counter-traction active energy recovery device, comprising:

[0005] An AC / DC inverter device, wherein the input terminal of the AC / DC inverter device is connected to a three-phase AC input line, and the AC / DC inverter device includes a DC output terminal;

[0006] DC / AC frequency converter device, wherein two DC / AC frequency converter devices are provided and connected in parallel to the DC output terminal of the AC / DC inverter device, and each DC / AC frequency converter device includes a three-phase output terminal;

[0007] The device includes two motors, each connected to a three-phase output terminal of a DC / AC frequency converter. The output shafts of the two motors are connected to each other via a coupling device. The motor with the smaller torque supplies power to the other DC / AC frequency converter via the corresponding DC / AC frequency converter.

[0008] The beneficial effects of this utility model are as follows: by using one AC / DC inverter and two DC / AC frequency converters, the power demand of the motor can be met. At the same time, because the two DC / AC frequency converters are connected in parallel, the motor with the smaller torque acts as a power generation device and directly supplies power to the other DC / AC frequency converter through the corresponding DC / AC frequency converter, thereby realizing energy recovery.

[0009] Furthermore, the AC / DC inverter includes a filter reactor, a filter capacitor inverter, a PFC reactor, a contactor, and a control board connected in sequence to the three-phase AC input lines. The output of the control board is connected in parallel to two of the DC / AC inverter devices.

[0010] Furthermore, the AC / DC inverter also includes a buffer resistor connected in parallel with the contactor.

[0011] Furthermore, the DC output terminal of the AC / DC inverter is connected to a DC bus, and the DC output terminals of both AC / DC inverters are connected to the DC bus.

[0012] Furthermore, the DC / AC frequency converter device also includes a grounding output terminal, which is connected to the grounding output terminal corresponding to the motor, and the motor is grounded.

[0013] Furthermore, the motor is connected to a temperature sensor.

[0014] Furthermore, the two motors are coaxial and symmetrical with respect to the docking device, each motor can move along a first direction to approach or move away from the docking device, and the docking device can reciprocate along a second direction. Attached Figure Description

[0015] Figure 1 This is a system block diagram of an embodiment of the present utility model;

[0016] Figure 2 This is an electrical schematic diagram of the DC / AC frequency converter device connection in an embodiment of this utility model;

[0017] Figure 3 This is an electrical schematic diagram of the AC / DC inverter device connection in an embodiment of this utility model;

[0018] Figure 4 This is a schematic diagram of the two motors driving each other in an embodiment of this utility model.

[0019] In the picture:

[0020] 1. Three-phase AC input line; 2. AC / DC inverter; 21. Filter reactor; 22. Filter capacitor frequency converter; 23. PFC reactor; 24. Contactor; 25. Control board; 26. Buffer resistor; 3. DC / AC frequency converter device; 4. Motor; 41. Temperature sensor; 5. Connection device; 6. DC bus. Detailed Implementation

[0021] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0022] See appendix Figure 1 As shown, the present invention discloses an active energy recovery device with two motors and four drives, comprising an AC / DC inverter 2, two DC / AC frequency converters 3 and two motors 4. The motors 4 and the DC / AC frequency converters 3 are in one-to-one correspondence, and the two motors 4 are driven in pairs. When there is a torque difference between the two motors 4, one motor 4 drives electricity and the other motor 4 generates electricity.

[0023] The input terminal of the AC / DC inverter 2 is connected to the three-phase AC input line 1. The AC / DC inverter 2 includes a DC output terminal, converting AC power to DC power. Two DC / AC frequency converters 3 are connected in parallel to the DC output terminal of the AC / DC inverter 2. Each DC / AC frequency converter 3 includes a three-phase output terminal. Since the motor 4 is an AC motor, the DC / AC frequency converter 3 is used to convert DC power into AC power usable by the motor 4. The two DC / AC frequency converters 3 are connected in parallel with the AC / DC inverter 2, and the AC / DC inverter 2 provides the same voltage to the two DC / AC frequency converters 3. The power terminals of the two motors 4 are respectively connected to the three-phase output terminals of the two DC / AC frequency converters 3. The output shafts of the two motors 4 are connected to each other via a coupling device 5. The motor 4 with the smaller torque powers the other DC / AC frequency converter 3 through the corresponding connected DC / AC frequency converter 3.

[0024] In this embodiment, compared to the existing technologies of series load resistor consumption for energy feedback and thyristor active inverter power supply, the power demand of motor 4 is met through one AC / DC inverter 2 and two DC / AC frequency converters 3. Simultaneously, because the two DC / AC frequency converters 3 are connected in parallel, the motor 4 with lower torque acts as a generator, directly supplying power to the other DC / AC frequency converter 3 through its corresponding DC / AC frequency converter 3, thus achieving energy recovery. For example, see the appendix. Figure 1As shown, the right motor 4 has a smaller torque at this time, and the direction of the electricity generated by the right motor 4 is shown by the hollow arrow in the figure. The left motor 4 is compensated by the electricity of the right motor 4, so the amount of electricity provided by the AC / DC inverter 2 required will be reduced, thus saving the overall energy loss.

[0025] See appendix Figure 3 As shown, the AC / DC inverter 2 includes a filter reactor 21, a filter capacitor inverter 22, a PFC reactor 23, a contactor 24, and a control board 25 connected in sequence to the three-phase AC input line 1. Two DC / AC inverter devices 3 are connected in parallel to the output of the control board 25. The filter reactor 21, filter capacitor inverter 22, and PFC reactor 23 perform filtering to stabilize the current; the contactor 24 controls the on / off switching; and the control board 25 provides control.

[0026] In one embodiment, the control board 25 is selected from the MD050N series active front end.

[0027] See appendix Figure 3 As shown, the filter reactor 21 includes inductors connected in series on the three lines of the three-phase line; the filter capacitor inverter 22 includes a capacitor between any two lines of the three-phase line; and the PFC reactor 23 includes inductors connected in series on the three lines of the three-phase line. The contactor 24 includes contactors on the three lines of the three-phase line and contactors connected between the DI1 port and the COM port of the control board 25.

[0028] The AC / DC inverter 2 also includes a buffer resistor 26 connected in parallel with the contactor 24. Each of the three contactors 24 on the three phase lines is connected in parallel with a buffer resistor 26, which serves as a buffer.

[0029] See appendix Figure 2 As shown, the DC output terminal of the AC / DC inverter 2 is connected to the DC bus 6, and the DC output terminals of both AC / DC inverters 2 are connected to the DC bus 6.

[0030] The DC / AC inverter device 3 also includes a grounding output terminal, which is connected to the grounding output terminal of the corresponding motor 4, thus grounding the motor 4. Grounding the motor 4 grounds the DC / AC inverter device 3, thereby improving the safety of both the motor 4 and the DC / AC inverter device 3.

[0031] The motor 4 is connected to a temperature sensor 41, which is used to detect the temperature of the motor 4 spindle. When the motor 4 temperature is too high, the power supply to the motor 4 can be disconnected to effectively protect the motor 4.

[0032] In one embodiment, the DC / AC inverter device 3 is an inverter of model ACS880.

[0033] See appendix Figure 4 As shown, the two motors 4 are coaxial and symmetrical with respect to the docking device 5. Each motor 4 can move along a first direction to approach or move away from the docking device 5, thereby adjusting the distance between the two motors 4 so that the motors 4 can dock with the docking device 5. The docking device 5 can reciprocate along a second direction to adjust its position and move it to the docking position. The docking device 5 can be a coupling. The first and second directions are vertical directions in the horizontal plane, namely the X-axis and Y-axis, respectively.

[0034] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A dual-motor counter-traction active energy recovery device, characterized in that: include: An AC / DC inverter device, wherein the input terminal of the AC / DC inverter device is connected to a three-phase AC input line, and the AC / DC inverter device includes a DC output terminal; DC / AC frequency converter device, wherein two DC / AC frequency converter devices are provided and connected in parallel to the DC output terminal of the AC / DC inverter device, and each DC / AC frequency converter device includes a three-phase output terminal; The device includes two motors, each connected to a three-phase output terminal of a DC / AC frequency converter. The output shafts of the two motors are connected to each other via a coupling device. The motor with the smaller torque supplies power to the other DC / AC frequency converter via the corresponding DC / AC frequency converter.

2. The active energy recovery device with dual motors in counter-traction as described in claim 1, characterized in that: The AC / DC inverter includes a filter reactor, a filter capacitor inverter, a PFC reactor, a contactor, and a control board connected in sequence to the three-phase AC input line. The output of the control board is connected in parallel to two of the DC / AC inverter devices.

3. The active energy recovery device for dual-motor counter-traction as described in claim 2, characterized in that: The AC / DC inverter also includes a buffer resistor connected in parallel with the contactor.

4. The active energy recovery device for dual-motor counter-traction as described in claim 1, characterized in that: The DC output terminal of the AC / DC inverter is connected to a DC bus, and the DC output terminals of both AC / DC inverters are connected to the DC bus.

5. The active energy recovery device for dual-motor counter-traction as described in claim 1, characterized in that: The DC / AC frequency converter device also includes a grounding output terminal, which is connected to the grounding output terminal corresponding to the motor, and the motor is grounded.

6. The active energy recovery device for dual-motor counter-traction as described in claim 1, characterized in that: The motor is connected to a temperature sensor.

7. The active energy recovery device for dual-motor counter-traction as described in claim 1, characterized in that: The two motors are coaxial and symmetrical with respect to the docking device. Each motor can move along a first direction to approach or move away from the docking device, and the docking device can reciprocate along a second direction.

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