Electric machine and control system therefor

Abstract

The application discloses a motor and a control system thereof, which comprises a stator support and a rotor, and further comprises: a motor shaft penetrating through the stator support; an electromagnetic induction mechanism arranged between the stator support and the rotor; a power control mechanism installed on the stator support; and a signal control mechanism arranged outside the stator support.In the application, firstly, the accuracy of signal processing and the stability of the system are remarkably improved by reducing electromagnetic interference; secondly, the heat dissipation cost and the overall cost of the controller are reduced by the efficient heat dissipation design; finally, the cost is optimized by avoiding the complex PCB manufacturing process through separate arrangement of circuit boards; and finally, the independent heat dissipation channel required when the power switch circuit is arranged outside the motor is avoided through the heat dissipation design of the heat dissipation channel of the stator support, so that the heat dissipation cost and the overall cost of the controller are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor and a control system thereof. Background Art

[0002] A three-phase motor is a device that converts electrical energy into mechanical energy. Its operating principle is based on electromagnetic induction. The magnetic field of the three-phase alternating current generates a rotational torque between the motor's rotor and stator, driving the motor.

[0003] A common practice in existing motor control systems is to integrate power switches and signal circuits on a single circuit board. This integrated design has some obvious drawbacks.

[0004] First, the copper thickness required for the signal circuit board is different from that required for the power switch circuit board. In order to meet the high copper thickness requirements of the power switch area, additional thick tin plating is required on the signal circuit board, or the signal layer is forced to use high copper thickness. This not only increases the complexity of the manufacturing process, but also significantly increases the cost.

[0005] Secondly, when the circuit board is placed close to the motor's stator windings, the stator windings generate high-frequency electromagnetic interference during operation, and the signal circuit board is very sensitive to electromagnetic interference. Placing the signal control part near the stator will cause interference to the signal circuit board, affecting the accuracy and stability of motor control.

[0006] Finally, because both the power switch and signal circuits require multiple lines, especially user-side interactive signals, placing the signal control unit near the stator requires numerous lines to pass through the motor shaft. This necessitates an increase in the motor shaft size to accommodate these lines. However, motor shaft size is typically carefully designed based on parameters such as motor power, speed, and torque. Increasing the shaft size disrupts the original design balance, requiring the redesign and adjustment of multiple components, increasing design difficulty and cost.

[0007] Based on this, a motor and control system are proposed. Summary of the Invention

[0008] The purpose of the present invention is to provide a motor and a control system thereof in order to solve the above problems.

[0009] In order to achieve the above object, the present invention adopts the following technical solution: the motor includes a stator bracket and a rotor, and further includes:

[0010] a motor shaft, the motor shaft passing through the stator bracket;

[0011] An electromagnetic induction mechanism is provided between the stator support and the rotor;

[0012] The power control mechanism is installed on the stator bracket; the signal control mechanism is arranged outside the stator bracket.

[0013] Preferably, the electromagnetic induction mechanism comprises a stator core mounted on a stator bracket, a stator winding is wound around the outer side of the stator core, the ends of the stator winding are gathered to form three winding joints, and a permanent magnet is mounted on the inner wall of the rotor.

[0014] Preferably, the power control mechanism comprises a power switch circuit board mounted on the stator bracket, the number of the power switch circuit board is one, and the input ends of the three winding joints are electrically connected to the power switch circuit board.

[0015] Preferably, the power control mechanism includes a power switch circuit board mounted on the stator bracket, and the number of the power switch circuit boards is three. The three power switch circuit boards are respectively arranged near three winding joints, and the input ends of the three winding joints are electrically connected to the corresponding power switch circuit boards.

[0016] Preferably, the signal control mechanism includes a control signal circuit board and a signal transmission component.

[0017] Preferably, the signal transmission component is a signal line.

[0018] Preferably, the signal transmission component is a wireless communication module.

[0019] Preferably, a rotor position sensor is also mounted on the stator bracket.

[0020] Preferably, the control system includes an acquisition module, an analysis module and a regulation module;

[0021] The acquisition module detects the resistance and current data of the internal windings of the main motor, the rated power, heat dissipation capacity, switching frequency, and withstand voltage of power switches 1, 2, and 3, and the flow rate and pipe diameter of the main motor's liquid cooling fluid, and transmits the detected data to the analysis module;

[0022] The analysis module analyzes the resistance and current data of the internal windings of the main motor to obtain the heat generation data of the main motor at each stage; analyzes the rated power, heat dissipation capacity, switching frequency and withstand voltage value of power switch 1, power switch 2 and power switch 3 to determine the shared power of power switch 1, power switch 2 and power switch 3, and generates a power adjustment signal based on the heat generation data and shared power size of each stage of the main motor, and transmits the power adjustment signal to the adjustment module; analyzes the flow rate data and pipe diameter data of the liquid cooling fluid of the main motor to determine whether the liquid cooling heat exchange of the main motor is abnormal. If it is determined to be abnormal, a heat exchange abnormality signal is generated and transmitted to the adjustment module;

[0023] The adjustment module receives the signal transmitted by the analysis module, identifies the type of signal, and performs corresponding operations.

[0024] Preferably, the analysis module performs the following steps to analyze the heat generation data of the main motor at each stage:

[0025] S1: Copper loss , is the current through the winding, is the resistance of the winding, iron loss , and is the preset material coefficient, is the frequency of the alternating magnetic field, is the magnetic flux density amplitude, and is the preset index; the heat generated by the motor in the corresponding state ;

[0026] S2: Average the multiple copper loss and iron loss data detected at the same time and standard deviation Calculation of the mean and standard deviation Set the data fluctuation range for the data detected at the same time. Set the fluctuation range to , mark the data outside the fluctuation range as outliers, remove the outliers, calculate the mean of the remaining data, and record the calculated mean of the remaining data as the corresponding data detected at the detection moment;

[0027] S3: Record the heat generation of the motor at each stage from the static state to the working state, and draw the corresponding coordinate points on the coordinate system established by the heat generation and the acquisition time, and connect the lines. According to the time period corresponding to the motor startup stage, the slope of the corresponding stage connection line is used as the heat generation change value of the corresponding stage. If there are multiple time period connection slopes in the corresponding stage, the slopes of the connection lines are averaged. Calculate the slope and mean The slope corresponding to each time period of this stage For comparison, is the sequence number of each time period;

[0028] S4: If the preset difference threshold is , then the heat production change value of this stage is determined to be Otherwise, the slope value corresponding to the starting time period of this stage is used as a reference, and the slope value of the starting time period is compared with the slope values ​​of the remaining time periods in chronological order. When the absolute value of the difference between the slope value of the first time period and the slope value of the starting time period is greater than the preset difference threshold value 2, it is determined that the starting time period to the first time period is Each time period is a small stage, and the heat production change value of this stage is from the starting time period to the The mean slope of the time period ;

[0029] S5: Divide the corresponding startup phase into small phases according to the above method, and record the heat production change value corresponding to each small phase.

[0030] Preferably, the analysis module can perform the following steps to analyze the power sharing of the power switches:

[0031] K1: The rated power of power switch 1, power switch 2 and power switch 3 are 、 and , normalize the rated power of the three power switches to get the relative rated power 、 and , , , is the maximum rated power of the three power switches;

[0032] K2: The heat dissipation capacity of power switch 1, power switch 2 and power switch 3 are 、 and , the heat dissipation capacity of the three power switches is normalized to obtain the relative heat dissipation capacity 、 and , , , is the maximum heat dissipation capacity among the three power switches;

[0033] K3: The switching frequencies of power switch 1, power switch 2 and power switch 3 are 、 and , normalize the switching frequencies of the three power switches to obtain the relative switching frequency 、 and , , , is the maximum switching frequency of the three power switches;

[0034] K4: The withstand voltage values ​​of power switch 1, power switch 2 and power switch 3 are 、 and , the withstand voltage values ​​of the three power switches are normalized to obtain the relative withstand voltage value 、 and , , , is the maximum withstand voltage value among the three power switches;

[0035] K5: Calculate the comprehensive coefficient of power switch based on the above data , is the weight coefficient of rated power, is the weight coefficient of heat dissipation capacity, is the weight coefficient of switching frequency , is the weight coefficient of the withstand voltage value ;The total power of the liquid-cooled motor in the corresponding stage is , then the power shared by power switch 1, power switch 2 and power switch 3 in the corresponding stage is , ; Generate a power adjustment signal according to the power shared by each power switch, and transmit the power adjustment signal to the adjustment module.

[0036] Preferably, the analysis module performs the following steps to analyze heat exchange anomalies:

[0037] M1: Flow rate Influence of convective heat transfer coefficient , , is the thermal conductivity of the coolant, is the inner diameter of the pipe, Reynolds number , is the kinematic viscosity, Prandtl number , , is the dynamic viscosity of the coolant, is the preset parameter; the calculated heat transfer of the liquid-cooled motor is , is the surface area of ​​the cooling pipe, The temperature difference between the coolant inlet and outlet;

[0038] M2: Actual heat exchange of liquid-cooled motor Perform detection, if the preset heat exchange threshold , it is determined that the heat exchange of the liquid-cooled motor is stable; otherwise, a heat exchange abnormality signal is generated and transmitted to the regulation module.

[0039] Preferably, the steps of operating the adjustment module are as follows:

[0040] N1: After receiving the power adjustment signal, the heat generation data of the main motor in the corresponding stage is used as the total power, and the power switches 1, 2, and 3 are adjusted according to the power sharing ratio;

[0041] N2: After receiving the heat exchange abnormality signal, the buzzer module inside the controller will sound a buzzer warning to inform the staff to perform maintenance operations in time.

[0042] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0043] 1. In this application, by placing the signal control mechanism (control signal circuit board) away from the motor, interference from the motor's internal high-frequency harmonic magnetic field on the signal processing circuit is avoided. This design significantly improves the accuracy and stability of signal processing, reduces signal distortion and bit errors, and thus enhances the overall reliability of the system.

[0044] 2. In this application, the signal circuit board and the power switch circuit board are arranged separately, eliminating the need to implement different copper thicknesses on the same PCB. This separate design can reduce PCB manufacturing costs and avoid additional thick tin plating processes, thereby achieving cost optimization.

[0045] 3. In this application, the heat dissipation design of the heat dissipation channel of the stator bracket is reused, thereby avoiding the need for an independent heat dissipation channel when the power switching circuit is set outside the motor, reducing the heat dissipation cost and the overall cost of the controller.

[0046] 4. In this application, the analysis module determines the power share of each power switch and then accurately distributes it, thereby avoiding the situation where the power switch accumulates too much heat, the temperature rises sharply, or even burns out due to exceeding the normal heat dissipation capacity, effectively ensuring the stable operation of the power switch and reducing the risk of damage to the power switch.

[0047] 5. In this application, the power of the power switch is reasonably allocated by analyzing the different total powers in each stage and the performance differences of the three power switches through the analysis module, which solves the problem that the motor starting process is not smooth and large vibration and noise are generated when the specific distribution of the power switch is unclear; the optimized starting power distribution method can reduce the adverse effects on the mechanical structure of the motor, improve the smoothness and reliability of the motor starting, extend the service life of the motor, and ensure the stability of the equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic diagram of the external structure of a motor provided in an embodiment of the present invention is shown;

[0049] Figure 2 A schematic diagram of the internal structure of a motor according to a first embodiment of the present invention is shown;

[0050] Figure 3 It shows a schematic diagram of the internal structure of a motor provided in accordance with the second embodiment of the present invention;

[0051] Figure 4 A system flow chart according to the second embodiment of the present invention is shown.

[0052] Legend:

[0053] 1. Rotor; 2. Permanent magnet; 3. Stator bracket; 4. Motor shaft; 5. Stator core; 6. Stator winding; 7. Winding connector; 8. Power switch circuit board. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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 any creative efforts shall fall within the scope of protection of the present invention.

[0055] Example 1:

[0056] See also Figure 1-Figure 3 The present invention provides a technical solution: a motor comprising a stator support 3 and a rotor 1, and further comprising:

[0057] The motor shaft 4 passes through the stator bracket 3;

[0058] The electromagnetic induction mechanism is provided between the stator support 3 and the rotor 1;

[0059] The power control mechanism is installed on the stator bracket 3 ; the signal control mechanism is arranged outside the stator bracket 3 .

[0060] The power control mechanism, mounted on the stator support 3, controls the motor's power output to meet varying load requirements. Optimizing power control improves the motor's energy efficiency and reduces energy consumption. The signal control mechanism, mounted on the exterior of the stator support 3, detects electrical quantities, including the position and speed of the rotor 1, the current and temperature of the stator winding 6, and the battery's voltage and temperature. This information, combined with user information, controls the operation of the power switch circuit board 8, ensuring safe and effective interaction between the motor and the user.

[0061] By placing the signal control mechanism outside the motor, the problem of interference of the motor's high-frequency harmonic-rich magnetic field and electromagnetic field on the signal processing circuit can be avoided. Compared with the existing patented solution of integrating the power switch and placing it on the stator, it will have higher reliability and reduce the failure rate.

[0062] Specifically, such as Figure 1 and Figure 2 As shown, the electromagnetic induction mechanism includes a stator core 5 mounted on a stator bracket 3, a stator winding 6 is wound around the outside of the stator core 5, and the ends of the stator winding 6 are gathered to form three winding joints 7, and a permanent magnet 2 is mounted on the inner wall of the rotor 1.

[0063] The stator core 5 is mounted on the stator bracket 3 and is typically constructed from laminated high-permeability silicon steel sheets to reduce hysteresis and eddy current losses. The stator winding 6 is wound around the outside of the stator core to generate a rotating magnetic field. The ends of the stator winding 6 converge to form three winding connections 7, facilitating connection to an external power source or controller for three-phase AC input.

[0064] Permanent magnets 2 typically use high-performance neodymium iron boron (NdFeB) or other rare earth permanent magnet materials to improve motor efficiency and power density. Permanent magnets 2 can be arranged in various configurations, such as a double V-shaped permanent magnet structure, to achieve sinusoidal flux linkage and back EMF, reduce air gap magnetic field harmonics, and minimize torque ripple and vibration noise.

[0065] Specifically, such as Figure 2 As shown, the power control mechanism includes a power switch circuit board 8 mounted on the stator bracket 3 . There is one power switch circuit board 8 , and the input ends of the three winding joints 7 are electrically connected to the power switch circuit board 8 .

[0066] The signal control mechanism includes a control signal circuit board and a signal transmission component, wherein the signal transmission component is a signal line, and the signal transmission component is a wireless communication module.

[0067] When the signal transmission component is a signal line, the signal line acts as a bridge connecting the control signal circuit board and the power switch circuit board 8, and is responsible for transmitting the signals on the power switch circuit board 8 to the control signal circuit board. These signals may include information such as the current, voltage, and temperature of the motor. The signals received by the control signal circuit board usually need to be processed to remove noise and interference and ensure signal accuracy. The processed signals will be input into the control algorithm. Common control algorithms include back electromotive force method, high-frequency signal injection method, model-based observer method, etc. These algorithms estimate the position and speed of the rotor 1 in real time based on the signals received by the control signal circuit board, thereby achieving precise control of the motor.

[0068] Signals from the power switch circuit board 8 are transmitted to the control signal circuit board via the wireless communication module. After receiving these signals, the wireless communication module on the control signal circuit board demodulates and decodes them to extract the raw data. This data typically includes information such as the motor's current and voltage, which can be used to estimate the position and speed of the rotor 1. The processed signals are then input into the control algorithm. Common control algorithms include back-electromotive force (BEMF), high-frequency signal injection, and model-based observer methods. These algorithms estimate the position and speed of the rotor 1 in real time based on the received signals, achieving precise control of the motor.

[0069] A rotor position sensor is mounted on the stator bracket 3 .

[0070] The rotor position sensor is used to detect the position of rotor 1 in real time. The rotor position sensor transmits the position signal of rotor 1 to the control signal circuit board via a signal line or wireless communication module. The wireless communication module or signal line serves as a bridge connecting the sensor and the signal circuit board to ensure accurate signal transmission.

[0071] The separate arrangement of the signal control mechanism and the power control mechanism reduces electromagnetic interference from the high-frequency power switch on the signal processing circuit. This reduces electromagnetic interference and optimizes heat dissipation, improving system stability and reliability. Furthermore, this separate arrangement eliminates the need to accommodate a large number of signal lines on the motor shaft 4, thus preventing an increase in the size of the motor shaft 4. The original dimensions of the motor components are maintained, preserving the motor's compactness and performance.

[0072] The control signal circuit board requires thinner copper than the power switch circuit board 8. The control signal circuit board only requires 0.5 ounces of copper, while the power switch circuit board 8 requires 2 ounces or more of copper. Separating these components eliminates the need to implement two different copper thicknesses on a single PCB, thereby reducing manufacturing costs.

[0073] From the perspective of heat generation, the control signal circuit board does not generate heat, and no heat dissipation measures and corresponding costs are required. The high-heat power switch is placed in the stator, which can achieve better cost-saving conditions than conventional controllers.

[0074] Specifically, such as Figure 1-Figure 3 As shown, the stator bracket 3 is made of metal, and the space between the stator bracket 3 and the rotor 1 is filled with coolant.

[0075] The stator bracket 3 made of metal can provide high mechanical strength and stability, ensuring that the motor maintains structural integrity during operation.

[0076] Metal has excellent thermal conductivity, quickly transferring heat generated by the power switch circuit board 8 and stator windings 6 to the coolant, thereby improving heat dissipation efficiency. The coolant simultaneously cools the stator core 5, stator windings 6, and rotor 1, ensuring uniform temperature distribution across the motor components and minimizing performance degradation due to localized overheating.

[0077] Example 2:

[0078] The solution is basically the same as that in the first embodiment, except that Figure 3-Figure 4 As shown, the power control mechanism includes a power switch circuit board 8 installed on the stator bracket 3. There are three power switch circuit boards 8. The three power switch circuit boards 8 are respectively arranged near three winding joints 7. The input ends of the three winding joints 7 are electrically connected to the corresponding power switch circuit boards 8.

[0079] There are three power switch circuit boards 8 , one for each of the three phase windings (U, V, W) of the motor. Each power switch circuit board 8 is located close to the corresponding winding connector 7 , facilitating direct control of the current in the stator winding 6 .

[0080] By controlling the power devices (such as MOSFET, IGBT, SCR, MCT, SIT, SIC or GAN) on the power switch circuit board 8, the on-off control of the motor winding is achieved, thereby adjusting the power output of the motor.

[0081] The three power switch circuit boards 8 are located close to the three-phase windings, which can effectively disperse heat and reduce the heat generated by each power switch. This design reduces the need for a centralized cooling system, reduces cooling costs, and achieves efficient cooling, high reliability, and flexible control.

[0082] At the same time, the distributed design reduces the risk of single-point failure. Even if one of the power switch circuit boards 8 fails, the other two phases can continue to operate. Each power switch circuit board 8 operates independently, reducing mutual interference and thus improving the overall reliability of the system.

[0083] The liquid-cooled motor control system includes an acquisition module, an analysis module, and a regulation module;

[0084] The heat generated by the liquid-cooled motor during operation is monitored. The total loss generated by the motor during operation can be approximately regarded as the source of heat generation, which mainly includes copper loss and iron loss. , is the current through the winding, is the resistance of the winding, iron loss , and is the preset material coefficient, is the frequency of the alternating magnetic field, is the magnetic flux density amplitude, and is the preset index;

[0085] During the operation of the motor, the copper loss and iron loss data of the motor are detected, and the multiple copper loss and iron loss data detected at the same time are averaged respectively. and standard deviation Calculation of the mean and standard deviation Set the data fluctuation range for the data detected at the same time. Set the fluctuation range to , mark the data outside the fluctuation range as outliers, remove the outliers, calculate the mean of the remaining data, and record the calculated mean of the remaining data as the corresponding data detected at the detection moment;

[0086] Heat generation of the motor under corresponding conditions , record the heat generation of the motor at each stage from the static state to the working state, and draw the corresponding coordinate points on the coordinate system established by the heat generation and the acquisition time, and connect them. According to the time period corresponding to the motor startup stage, the slope of the corresponding stage connection line is used as the heat generation change value of the corresponding stage. If there are multiple time period connection slopes in the corresponding stage, the slopes of each connection line are averaged. Calculate the slope and mean The slope corresponding to each time period of this stage For comparison, is the serial number of each time period. If the preset difference threshold is , then the heat production change value of this stage is determined to be Otherwise, the slope value corresponding to the starting time period of this stage is used as a reference, and the slope value of the starting time period is compared with the slope values ​​of the remaining time periods in chronological order. When the absolute value of the difference between the slope value of the first time period and the slope value of the starting time period is greater than the preset difference threshold value 2, it is determined that the starting time period to the first time period is Each time period is a small stage, and the heat production change value of this stage is from the starting time period to the The mean slope of the time period ; Divide the corresponding startup phase into small stages according to the above method, and record the heat production change value corresponding to each small stage.

[0087] The rated power, heat dissipation capacity, switching frequency and withstand voltage of power switch 1, power switch 2 and power switch 3 are tested. The rated power of power switch 1, power switch 2 and power switch 3 are 、 and , normalize the rated power of the three power switches to get the relative rated power 、 and , , , is the maximum rated power of the three power switches;

[0088] The heat dissipation capabilities of power switch 1, power switch 2, and power switch 3 are 、 and , the heat dissipation capacity of the three power switches is normalized to obtain the relative heat dissipation capacity 、 and , , , is the maximum heat dissipation capacity among the three power switches;

[0089] The switching frequencies of power switch 1, power switch 2 and power switch 3 are 、 and , normalize the switching frequencies of the three power switches to obtain the relative switching frequency 、 and , , , is the maximum switching frequency of the three power switches;

[0090] The withstand voltage values ​​of power switch 1, power switch 2 and power switch 3 are 、 and , the withstand voltage values ​​of the three power switches are normalized to obtain the relative withstand voltage value 、 and , , , is the maximum withstand voltage value among the three power switches;

[0091] Calculate the comprehensive coefficient of power switch based on the above data , is the weight coefficient of rated power, is the weight coefficient of heat dissipation capacity, is the weight coefficient of switching frequency , is the weight coefficient of the withstand voltage value ;The total power of the liquid-cooled motor in the corresponding stage is , then the power shared by power switch 1, power switch 2 and power switch 3 in the corresponding stage is , ; Generate a power adjustment signal according to the power shared by each power switch, and transmit the power adjustment signal to the adjustment module.

[0092] In the liquid cooling structure of the liquid-cooled motor, the flow rate of the coolant The larger the value, the more heat is taken away per unit time, and the flow rate Influence of convective heat transfer coefficient , , is the thermal conductivity of the coolant, is the inner diameter of the pipe, Reynolds number , is the kinematic viscosity, Prandtl number , , is the dynamic viscosity of the coolant, is the preset parameter. When the fluid is heated, The value of is 0.4, when the fluid is cooled, The value of is 0.3; then the calculated heat transfer of the liquid-cooled motor , is the surface area of ​​the cooling pipe, The temperature difference between the coolant inlet and outlet;

[0093] Actual heat exchange of liquid-cooled motor Perform detection, if the preset heat exchange threshold , it is determined that the heat exchange of the liquid-cooled motor is stable; otherwise, a heat exchange abnormality signal is generated and transmitted to the regulation module.

[0094] The above description of the embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A motor comprising a stator support (3) and a rotor (1), characterized in that: Also includes: A motor shaft (4), the motor shaft (4) passing through the stator bracket (3); An electromagnetic induction mechanism is provided between the stator support (3) and the rotor (1), wherein a permanent magnet (2) is mounted on the rotor (1); A power control mechanism is mounted on the stator bracket (3), the power control mechanism comprising a power switch circuit board (8) mounted on the stator bracket (3), the number of the power switch circuit boards (8) being three; A signal control mechanism is arranged outside the stator bracket (3); The motor control system includes an analysis module; Analyze the resistance and current data of the internal windings of the main motor to obtain the heat generation data of the main motor at each stage; analyze the rated power, heat dissipation capacity, switching frequency and withstand voltage value of power switch 1, power switch 2 and power switch 3 to determine the shared power of power switch 1, power switch 2 and power switch 3, and generate a power adjustment signal based on the heat generation data and shared power of each stage of the main motor, and transmit the power adjustment signal to the adjustment module; analyze the flow rate data and pipe diameter data of the liquid cooling fluid of the main motor to determine whether the liquid cooling heat exchange of the main motor is abnormal. If it is determined to be abnormal, generate a heat exchange abnormality signal and transmit the heat exchange abnormality signal to the adjustment module; The analysis module performs the following steps to analyze the power sharing of power switches: K1: The rated power of power switch 1, power switch 2 and power switch 3 are 、 and , normalize the rated power of the three power switches to get the relative rated power 、 and , , , is the maximum rated power of the three power switches; K2: The heat dissipation capacity of power switch 1, power switch 2 and power switch 3 are 、 and , the heat dissipation capacity of the three power switches is normalized to obtain the relative heat dissipation capacity 、 and , , , is the maximum heat dissipation capacity among the three power switches; K3: The switching frequencies of power switch 1, power switch 2 and power switch 3 are 、 and , normalize the switching frequencies of the three power switches to obtain the relative switching frequency 、 and , , , is the maximum switching frequency of the three power switches; K4: The withstand voltage values ​​of power switch 1, power switch 2 and power switch 3 are 、 and , the withstand voltage values ​​of the three power switches are normalized to obtain the relative withstand voltage value 、 and , , , is the maximum withstand voltage value among the three power switches; K5: Calculate the comprehensive coefficient of power switch based on the above data , is the weight coefficient of rated power, is the weight coefficient of heat dissipation capacity, is the weight coefficient of switching frequency , is the weight coefficient of the withstand voltage value ;The total power of the liquid-cooled motor in the corresponding stage is , then the power shared by power switch 1, power switch 2 and power switch 3 in the corresponding stage is , ; Generate a power adjustment signal according to the power shared by each power switch, and transmit the power adjustment signal to the adjustment module; The analysis module performs the following steps to analyze heat exchange anomalies: M1: Flow rate Influence of convective heat transfer coefficient , , is the thermal conductivity of the coolant, is the inner diameter of the pipe, Reynolds number , is the kinematic viscosity, Prandtl number , , is the dynamic viscosity of the coolant, is the preset parameter; the calculated heat transfer of the liquid-cooled motor is , is the surface area of ​​the cooling pipe, The temperature difference between the coolant inlet and outlet; M2: Actual heat exchange of liquid-cooled motor Perform detection, if the preset heat exchange threshold , it is determined that the heat exchange of the liquid-cooled motor is stable; otherwise, a heat exchange abnormality signal is generated and transmitted to the regulation module.

2. The motor according to claim 1, characterized in that The electromagnetic induction mechanism comprises a stator core (5) mounted on a stator bracket (3), a stator winding (6) is wound around the outer side of the stator core (5), and the ends of the stator winding (6) are gathered to form three winding joints (7).

3. The motor according to claim 2, characterized in that The three power switch circuit boards (8) are respectively arranged at positions close to the three winding joints (7), and the input ends of the three winding joints (7) are electrically connected to the corresponding power switch circuit boards (8).

4. The motor according to claim 1, characterized in that The signal control mechanism includes a control signal circuit board and a signal transmission component.

5. The motor according to claim 4, characterized in that The signal transmission component is a signal line.

6. The motor according to claim 4, characterized in that The signal transmission component is a wireless communication module.

7. The motor according to any one of claims 5 or 6, characterized in that: A rotor position sensor is also mounted on the stator bracket (3).

8. The motor according to claim 1, characterized in that The control system also includes an acquisition module and a regulation module; The acquisition module detects the resistance and current data of the internal windings of the main motor, the rated power, heat dissipation capacity, switching frequency, and withstand voltage of power switches 1, 2, and 3, and the flow rate and pipe diameter of the main motor's liquid cooling fluid, and transmits the detected data to the analysis module; The analysis module analyzes the resistance and current data of the internal windings of the main motor to obtain the heat generation data of the main motor at each stage; analyzes the rated power, heat dissipation capacity, switching frequency and withstand voltage value of power switch 1, power switch 2 and power switch 3 to determine the shared power of power switch 1, power switch 2 and power switch 3, and generates a power adjustment signal based on the heat generation data and shared power size of each stage of the main motor, and transmits the power adjustment signal to the adjustment module; analyzes the flow rate data and pipe diameter data of the liquid cooling fluid of the main motor to determine whether the liquid cooling heat exchange of the main motor is abnormal. If it is determined to be abnormal, a heat exchange abnormality signal is generated and transmitted to the adjustment module; The adjustment module receives the signal transmitted by the analysis module, identifies the type of signal, and performs corresponding operations.

9. The motor according to claim 8, characterized in that The analysis module analyzes the heat generation data of the main motor at each stage as follows: S1: Copper loss , is the current through the winding, is the resistance of the winding, iron loss , and is the preset material coefficient, is the frequency of the alternating magnetic field, is the magnetic flux density amplitude, and is the preset index; the heat generated by the motor in the corresponding state ; S2: Average the multiple copper loss and iron loss data detected at the same time and standard deviation Calculation of the mean and standard deviation Set the data fluctuation range for the data detected at the same time. Set the fluctuation range to , mark the data outside the fluctuation range as outliers, remove the outliers, calculate the mean of the remaining data, and record the calculated mean of the remaining data as the corresponding data detected at the detection moment; S3: Record the heat generation of the motor at each stage from the static state to the working state, and draw the corresponding coordinate points on the coordinate system established by the heat generation and the acquisition time, and connect the lines. According to the time period corresponding to the motor startup stage, the slope of the corresponding stage connection line is used as the heat generation change value of the corresponding stage. If there are multiple time period connection slopes in the corresponding stage, the slopes of the connection lines are averaged. Calculate the slope and mean The slope corresponding to each time period of this stage For comparison, is the sequence number of each time period; S4: If the preset difference threshold is , then the heat production change value of this stage is determined to be Otherwise, the slope value corresponding to the starting time period of this stage is used as a reference, and the slope value of the starting time period is compared with the slope values ​​of the remaining time periods in chronological order. When the absolute value of the difference between the slope value of the first time period and the slope value of the starting time period is greater than the preset difference threshold value 2, it is determined that the starting time period to the first time period is Each time period is a small stage, and the heat production change value of this stage is from the starting time period to the The mean slope of the time period ; S5: Divide the corresponding startup phase into small phases according to the above method, and record the heat production change value corresponding to each small phase.

10. The motor according to claim 1, characterized in that The steps for the adjustment module to perform operations are as follows: N1: After receiving the power adjustment signal, the heat generation data of the main motor in the corresponding stage is used as the total power, and the power switches 1, 2, and 3 are adjusted according to the power sharing ratio; N2: After receiving the heat exchange abnormality signal, the buzzer module inside the controller will sound a buzzer warning to inform the staff to perform maintenance operations in time.

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