Motor stator heating system

Abstract

The utility model discloses a motor stator heating system. The motor stator heating system comprises an upper computer, a communication module, a plurality of motor controllers and a plurality of motor stations, the communication module is connected with the upper computer, and the communication module is used for performing signal transmission on the upper computer; the plurality of motor controllers are connected with the communication module through a communication bus, and the motor controllers receive a control instruction of the upper computer through the communication module; the plurality of motor stations and the plurality of motor controllers are connected in a one-to-one correspondence manner, and the motor stations are used for placing to-be-heated motors and receiving currents output by the motor controllers so as to control the heating time and temperature of the motors. According to the utility model, the heating aging efficiency of the motor stator is improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of travel tools, and in particular to a motor stator heating system. Background Art

[0002] In recent years, with the development of the new energy industry, electric vehicles have also followed the development of society and gradually occupied a key position in the field of transportation. With the increasing demand for electric vehicles, the demand for new energy motors has also increased. As a result, manufacturers have also encountered the problem of motor aging during the production process. If a one-to-one burn-in method is used, the process will undoubtedly be slow, which is not conducive to production efficiency for manufacturers. In addition, a one-to-one burn-in method significantly increases the investment cost of test equipment. Utility Model Content

[0003] The utility model provides a motor stator heating system to improve the efficiency of motor stator heating aging and reduce costs.

[0004] Specifically, the motor stator heating system includes:

[0005] Host computer;

[0006] A communication module, connected to the host computer, and configured to transmit signals to the host computer;

[0007] A plurality of motor controllers, each of which is connected to the communication module via a communication bus, and receives control instructions from the host computer via the communication module;

[0008] Multiple motor stations are connected to multiple motor controllers in a one-to-one correspondence. The motor stations are used to place the motors to be heated and receive the current output by the motor controllers to control the heating time and temperature of the motors.

[0009] Optionally, the communication module is a CAN card, and the communication bus is a CAN bus.

[0010] Optionally, the motor stator heating system further includes: a first resistor and a second resistor, the first resistor being connected in parallel with the starting end of the CAN bus, and the second resistor being connected in parallel with the end of the CAN bus; wherein the starting end of the CAN bus is the end connected to the CAN card.

[0011] Optionally, the CAN bus includes a high-level data line and a low-level data line;

[0012] The first end of the high-level data line and the first end of the low-level data line constitute the start end of the CAN bus, and the second end of the high-level data line and the second end of the low-level data line constitute the end end of the CAN bus.

[0013] Optionally, the CAN bus is a twisted pair cable with a shielding layer, and the shielding layer is grounded.

[0014] Optionally, the motor stator heating system further includes: a first shielding capacitor, a second shielding capacitor, a first shielding resistor, and a second shielding resistor;

[0015] The starting end of the shielding layer is grounded through the first shielding capacitor and the first shielding resistor connected in series, and the end of the shielding layer is grounded through the second shielding capacitor and the second shielding resistor connected in series; the starting end of the shielding layer is the end connected to the CAN card.

[0016] Optionally, the starting end of the CAN bus is inserted into a magnetic ring.

[0017] Optionally, the motor stator heating system further includes: a DC power supply, the DC power supply is electrically connected to the busbars of the multiple motor controllers, the multiple motor controllers are connected in parallel, and the DC power supply supplies power to the busbars of the multiple motor controllers.

[0018] Optionally, the busbar of the motor controller is a busbar with a shielding layer, and the shielding layer is grounded.

[0019] Optionally, both ends of the shielding layer are grounded.

[0020] The motor stator heating system provided by the embodiment of the present invention can realize the simultaneous aging of multiple stators, thereby reducing the heating aging time. For example, in the prior art, it takes 3 to 4 hours to complete the aging of a stator; in the embodiment of the present invention, the aging of 10 stators can be completed at the same time in 3 to 4 hours, thereby improving the efficiency of heating aging. In addition, the multiple motor stations and multiple motor controllers provided by the embodiment of the present invention can share a communication module and a host computer, which is conducive to reducing test resources and reducing costs. Furthermore, the embodiment of the present invention adopts the form of a communication bus, which can perform job calibration on different motor controllers. According to the calibration, the motor controller corresponding to each motor station sets a frame of external communication message, which is conducive to reducing communication interference and avoiding the collapse of the communication bus, thereby making the test more stable.

[0021] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of a motor stator heating system provided in an embodiment of the present utility model;

[0024] Figure 2 A schematic structural diagram of another motor stator heating system provided by an embodiment of the present utility model;

[0025] Figure 3 A schematic diagram of a control interface of a host computer provided in an embodiment of the present utility model;

[0026] Figure 4 A partial structural diagram of a motor stator heating system provided by an embodiment of the present utility model;

[0027] Figure 5 for Figure 4 PCB layout. DETAILED DESCRIPTION

[0028] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] Figure 1 This is a schematic diagram of the structure of a motor stator heating system provided by an embodiment of the present utility model. Figure 1 , the motor stator heating system includes:

[0031] Host computer 100;

[0032] Communication module 200, the communication module 200 is connected to the host computer 100, and the communication module 200 is used to transmit signals to the host computer 100;

[0033] Multiple motor controllers 300, each of which is connected to the communication module 200 via the communication bus 210, and the motor controllers 300 receive control instructions from the host computer 100 via the communication module 200;

[0034] Multiple motor stations 400 are connected to multiple motor controllers 300 in a one-to-one correspondence. The motor stations 400 are used to place the motors to be heated and receive the current output by the motor controller 300 to control the heating time and temperature of the motors.

[0035] Exemplarily, the working principle of the motor stator heating system is that the motor controller 300 can be calibrated according to a custom protocol and the same set of procedures. According to the calibration, the motor controller 300 corresponding to each motor station 400 sets a frame of external communication message. Specifically, according to the number of motors that need to be heated by the user, a corresponding number of motor stations 400 and motor controllers 300 are set, and the motor controllers 300 are calibrated in the host computer 100 through a specified message, for example, controller 1, controller 2, controller 3... etc. After the calibration is completed, the calibration results are stored in the non-volatile memory (e.g., EEPROM) of the host computer 100. This arrangement does not require recalibration even if the motor stator heating system is powered on and off again. In an embodiment of the present invention, each motor controller 300 corresponds to a specific motor station 400. For example, if the motor controller 300 is calibrated as number 1, the actual installation location of the motor controller is at motor station 1. This arrangement facilitates accurate positioning of the operator, thereby reducing the possibility of misjudgment during the operation process.

[0036] After the motor controller 300 is powered, it receives instructions from the host computer 100 through the communication module 200. If it corresponds to its own number, it will take corresponding actions according to the instructions, and the motor controller 300 will send a frame of its own status information to the communication bus 210 at a certain period. Among them, each motor controller 300 is equivalent to being connected in parallel to the communication bus 310, and the information of each message does not interfere with each other. In actual applications, the number of motor controllers 300 can be adjusted as needed (for example, increasing or decreasing the number of motor controllers 300, and correspondingly increasing or decreasing the number of motor stations 400). For example, the motor stator heating system includes 10 motor controllers 300, and there are 10 ID messages on the communication bus 210. This setting is conducive to reducing the burden on the communication bus 210 and preventing communication interference.

[0037] The specific way in which the host computer 100 performs control is to send a specific control mode, current, and a predetermined stator temperature and time through the communication module 200, so that the motor controller 300 controls the duty cycle of the relevant switch tube, so that the stator on the motor station 400 is in the expected working condition and continues to work. Specifically, the host computer 100 sends a control instruction through the communication module 200, and the control instruction can control the switch tube in the motor controller 300, as well as the output current, for example, output U-phase current, V-phase current and W-phase current. If a motor is placed on the motor station 400, the U-phase current, V-phase current and W-phase current are input to the stator of the motor, and the stator begins to be heated and aged, and the output is maintained after reaching a certain temperature. This setting is conducive to improving the efficiency of heating and aging of the motor stator, thereby improving the efficiency of stator filling and drying.

[0038] Thus, the host computer 100 plays the role of sending instructions and receiving data in the motor stator heating system. At the same time, during the test process, it can record relevant data in real time, which is convenient for analysis and subsequent tracing when a fault occurs. In addition, the host computer 100 can also be set to display the data of the aging process in real time.

[0039] In summary, the motor stator heating system provided by the embodiment of the present invention can achieve simultaneous aging of multiple stators, thereby reducing the time of heating aging. For example, in the prior art, it takes 3 to 4 hours to complete the aging of a stator; in the embodiment of the present invention, the aging of 10 stators can be completed at the same time in 3 to 4 hours, thereby improving the efficiency of heating aging. In addition, the multiple motor stations 400 and multiple motor controllers 300 provided by the embodiment of the present invention can share a communication module 200 and a host computer 100, which is conducive to reducing test resources and reducing costs. Furthermore, the embodiment of the present invention adopts the form of a communication bus, which can calibrate different motor controllers 300. According to the calibration, the motor controller 300 corresponding to each motor station 400 sets a frame of external communication message, which is conducive to reducing communication interference and avoiding the collapse of the communication bus, thereby making the test more stable.

[0040] Continue to see Figure 1 Based on the above embodiments, the motor stator heating system optionally further includes a DC power supply 500. The DC power supply 500 is electrically connected to the busbars of the multiple motor controllers 300. The multiple motor controllers 300 are connected in parallel, and the DC power supply 500 supplies power to the busbars of the multiple motor controllers 300. For example, the DC power supply 500 includes a positive output and a negative output. The red line represents the positive voltage output of the DC power supply 500, and the black line represents the negative output of the DC power supply 500. The positive busbar of each motor controller 300 is connected to the positive output of the DC power supply 500, and the negative busbar of each motor controller 300 is connected to the negative output of the DC power supply 500, thereby achieving parallel connection of the motor controllers 300.

[0041] For example, when the motor stator heating system is in operation, the voltage output by the DC power supply 500 is first input to each motor controller 300 through manual control or external signal control, powering each motor controller 300 and enabling normal operation. Then, the communication module 200 receives instructions from the host computer 100. If the number corresponds to its own, the motor controller 300 performs the corresponding action according to the instruction. At a certain period, each motor controller 300 will send a frame of its own status information to the communication bus 210.

[0042] The multiple motor workstations 400 and multiple motor controllers 300 provided in the embodiment of the present invention can share a communication module 200 and a host computer 100, and can also share a DC power supply 500, which is conducive to further reducing testing resources and reducing costs.

[0043] Figure 2 This is a schematic diagram of another motor stator heating system provided by an embodiment of the present invention. Figure 2Based on the above embodiments, optionally, the communication module 200 is a CAN card, and the communication bus 210 is a CAN bus. The CAN card is used for CAN communication, which stands for Controller Area Network communication and has the advantages of fast transmission speed, stable data transmission signals, and strong anti-interference capabilities. The CAN bus includes a high-level data line 211 and a low-level data line 212. The high-level data line 211 can also be called a CANH line, and the low-level data line 212 can also be called a CANL line.

[0044] For example, the CAN card can be connected to the host computer 100 via a USB cable. The host computer 100 sends control instructions through the CAN card. These control instructions can control the switches in the motor controller 300 and output currents, such as the U-phase current, the V-phase current, and the W-phase current. If a motor is placed on the motor station 400, the U-phase current, the V-phase current, and the W-phase current are input to the stator of the motor, starting the stator heating and aging process. After reaching a certain temperature, the output is maintained.

[0045] Continue to see Figure 2 Based on the above embodiments, the motor stator heating system may optionally further include: a first resistor 220 and a second resistor 230, wherein the first resistor 220 is connected in parallel with the starting end of the CAN bus, and the second resistor 230 is connected in parallel with the end of the CAN bus; wherein the starting end of the CAN bus is the end connected to the CAN card. Exemplarily, the resistance values of the first resistor 220 and the second resistor 230 are both 120Ω. In the embodiment of the utility model, a resistor is connected in parallel at each of the front and rear ends of the CAN bus, which is beneficial for ensuring impedance matching, eliminating signal reflections, suppressing noise, ensuring the stability of the CAN bus state, and improving signal quality, thereby further improving the stability and reliability of CAN bus communication.

[0046] Continue to see Figure 2 Based on the above embodiments, optionally, the first end of the high-level data line 211 and the first end of the low-level data line 212 constitute the starting end of the CAN bus, and the second end of the high-level data line 211 and the second end of the low-level data line 212 constitute the ending end of the CAN bus. The CAN card is connected between the first end of the high-level data line 211 and the first end of the low-level data line 212, the first resistor 220 is connected between the first end of the high-level data line 211 and the first end of the low-level data line 212, and the second resistor 230 is connected between the second end of the high-level data line 211 and the second end of the low-level data line 212.

[0047] Figure 3 This is a schematic diagram of a control interface of a host computer provided by an embodiment of the present utility model. Figure 3For example, the motor stator heating system includes 10 motor stations. In the control interface of the host computer, communication and control with these 10 motor stations can be achieved through a CAN card. The codes of these 10 motor stations are 1#, 2#, 3#, 4#, ..., 10# respectively. In this control interface, the setting of the preset heating time and the preset heating temperature can be realized, and the bus voltage, bus current, phase current, system status, fault type, motor temperature, controller temperature (i.e., the temperature of the motor controller) and stator heating time of each motor station can be monitored. In addition, by clicking the start button, the corresponding motor station can start working according to the set preset heating time and preset heating temperature. In the embodiment of the present utility model, it is exemplarily shown that the preset heating time and preset heating temperature of each motor station are equal. This is not a limitation of the present utility model. In other embodiments, the preset heating time and preset heating temperature of each motor station can also be set separately.

[0048] Figure 4 This is a partial structural diagram of a motor stator heating system provided by an embodiment of the utility model. Figure 5 for Figure 4 PCB layout. Figure 4 and Figure 5 Based on the above embodiments, the CAN bus 210 can optionally be a twisted pair with a shielded layer, and the shielding layer is grounded. This configuration helps to avoid electromagnetic interference, improve signal transmission quality, and thus enhance system reliability.

[0049] In the above embodiments, the shielding layer may be grounded at a single point or at multiple points.

[0050] Continue to see Figure 4 In one embodiment, optionally, the embodiment of the present invention adopts a method of grounding at both ends. Specifically, the motor stator heating system also includes: a first shielding capacitor C1, a second shielding capacitor C2, a first shielding resistor R1, and a second shielding resistor R2. The starting end of the shielding layer is connected to the ground GND through the first shielding capacitor C1 and the first shielding resistor R1 connected in series, and the end of the shielding layer is connected to the ground GND through the second shielding capacitor C2 and the second shielding resistor R2 connected in series; the starting end of the shielding layer is the end connected to the CAN card. The first shielding capacitor C1, the second shielding capacitor C2, the first shielding resistor R1, and the second shielding resistor R2 constitute an RC shielding unit 600. The embodiment of the present invention adopts a method of grounding at both ends of the shielding layer, which is conducive to forming an effective shielding loop, thereby further improving the anti-interference ability of the CAN bus and improving the stability of the system. And the embodiment of the present invention realizes the complete isolation of high-voltage wiring and low-voltage wiring, and no interference with each other, further improving the stability of the motor stator heating system.

[0051] Continue to see Figure 4 Based on the above embodiments, each motor controller optionally includes a switching transistor and a control-end resistor. The switching transistors constitute a switching transistor unit 310, and the control-end resistors constitute a resistor unit 320. For example, the motor stator heating system includes five motor controllers. Accordingly, the switching transistor unit 310 includes switching transistors Q1, Q2, Q3, Q4, and Q5; and the resistor unit 320 includes control-end resistors R3, R4, R5, R6, and R7.

[0052] Based on the above embodiments, a magnetic ring can optionally be inserted into the beginning of the CAN bus. The magnetic ring can be made of a ferrite material with high magnetic permeability and good high-frequency suppression. The magnetic ring can be annular or cylindrical to facilitate insertion into the CAN bus. This embodiment of the utility model further suppresses electromagnetic interference by inserting the magnetic ring, thereby further improving the stability and reliability of CAN bus communication.

[0053] Continue to see Figure 4 and Figure 5 On the basis of the above embodiments, optionally, the busbar of the motor controller 300 is a busbar with a shielding layer, and the shielding layer is grounded GND. Preferably, both ends of the shielding layer are grounded. Among them, the busbar of the motor controller 300 includes a positive busbar 510 and a negative busbar 520, which are specifically provided by a DC power supply. However, unlike the battery pack on the electric vehicle, the DC power supply is usually obtained by converting the AC / DC power supply from the mains electricity. Therefore, the DC power supply usually has more interference, which causes the CAN bus to be interfered with, resulting in unstable communication. The embodiment of the utility model is to set the busbar as a busbar with a shielding layer, and the shielding layer is grounded GND, which is beneficial to avoid electromagnetic interference in the DC power supply to the CAN bus, thereby improving the signal transmission quality of the CAN bus and enhancing the reliability of the system.

[0054] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this utility model can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this utility model can be achieved. This is not limited herein.

[0055] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A motor stator heating system, characterized in that: include: Host computer; A communication module, connected to the host computer, and configured to transmit signals to the host computer; A plurality of motor controllers, each of which is connected to the communication module via a communication bus, and receives control instructions from the host computer via the communication module; Multiple motor stations are connected to multiple motor controllers in a one-to-one correspondence. The motor stations are used to place the motors to be heated and receive the current output by the motor controllers to control the heating time and temperature of the motors.

2. The motor stator heating system according to claim 1, characterized in that: The communication module is a CAN card, and the communication bus is a CAN bus.

3. The motor stator heating system according to claim 2, characterized in that: Also includes: A first resistor and a second resistor, wherein the first resistor is connected in parallel with the starting end of the CAN bus, and the second resistor is connected in parallel with the ending end of the CAN bus; wherein the starting end of the CAN bus is the end connected to the CAN card.

4. The motor stator heating system according to claim 3, characterized in that: The CAN bus includes a high-level data line and a low-level data line; The first end of the high-level data line and the first end of the low-level data line constitute the start end of the CAN bus, and the second end of the high-level data line and the second end of the low-level data line constitute the end end of the CAN bus.

5. The motor stator heating system according to claim 2, characterized in that: The CAN bus is a twisted pair cable with a shielding layer, and the shielding layer is grounded.

6. The motor stator heating system according to claim 5, characterized in that: Also includes: a first shielding capacitor, a second shielding capacitor, a first shielding resistor, and a second shielding resistor; The starting end of the shielding layer is grounded through the first shielding capacitor and the first shielding resistor connected in series, and the end of the shielding layer is grounded through the second shielding capacitor and the second shielding resistor connected in series; the starting end of the shielding layer is the end connected to the CAN card.

7. The motor stator heating system according to claim 5, characterized in that: The starting end of the CAN bus is sleeved into a magnetic ring.

8. The motor stator heating system according to claim 1, characterized in that: Also includes: A DC power supply is electrically connected to the busbars of the plurality of motor controllers. The plurality of motor controllers are connected in parallel. The DC power supply supplies power to the busbars of the plurality of motor controllers.

9. The motor stator heating system according to claim 8, characterized in that: The busbar of the motor controller is a busbar with a shielding layer, and the shielding layer is grounded.

10. The motor stator heating system according to claim 9, characterized in that: Both ends of the shielding layer are grounded.

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