Integrated motor winding temperature observation method and system, electronic equipment and vehicle

Abstract

The invention provides an integrated motor winding temperature observation method and system, electronic equipment and a vehicle, and relates to the technical field of motor temperature monitoring, and the method comprises the steps: inputting a current of a preset duration to a motor, and obtaining a corresponding stator winding temperature, a PCB temperature and a change curve of a stator core temperature along with time of the motor under the current; according to the change curve of the stator winding temperature, the PCB temperature and the stator core temperature corresponding to the current of the motor along with time, obtaining the thermal resistance parameters between the preset parts; constructing a thermal network system state equation according to the preset components and the thermal resistance parameters among the preset components; wherein the thermal network system state equation represents the relationship between the PCB temperature and the stator winding temperature; and according to the real-time PCB temperature collected in real time, the stator winding temperature to be measured is determined through the thermal network system state equation. According to the invention, the problem of inaccurate motor winding temperature calculation in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor temperature monitoring, and in particular to an integrated motor winding temperature observation method, system, electronic equipment and vehicle. Background Art

[0002] In some cases where space is limited by mechanical structure, it is necessary to integrate the motor and controller into one to make the structure more compact. For example, EPS motors, all-in-one electric drive assemblies, electric air conditioners and electric pumps, etc., share a common housing with the motor for heat dissipation. At this time, the heat generated by the controller will be transmitted to the motor, causing the motor temperature to increase. At the same time, the temperature rise caused by the controller will also affect the identification of the motor winding temperature parameters, causing parameter deviations, which will lead to large calculation errors under extreme conditions. This is when accurate temperature estimation is needed for protection, otherwise it will lead to untimely protection or premature protection. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an integrated motor winding temperature observation method, system, electronic equipment and vehicle, which solves the problem of inaccurate calculation of motor winding temperature in the prior art.

[0004] At least one embodiment of the present invention provides an integrated motor winding temperature observation method, comprising:

[0005] Input a current of a preset duration to the motor, and obtain a curve of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor under the current over time;

[0006] According to the change curves of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor under the current over time, the thermal resistance parameters between each preset component and each preset component are obtained;

[0007] According to the thermal resistance parameters of each preset component and between each preset component, a thermal network system state equation is constructed; wherein the thermal network system state equation characterizes the relationship between the PCB board temperature and the stator winding temperature;

[0008] According to the real-time PCB board temperature collected in real time, the stator winding temperature to be measured is determined through the thermal network system state equation.

[0009] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0010] By acquiring each change curve, the thermal resistance parameters between the preset components inside the motor and the preset components can be obtained, and a more sound thermal network system state equation can be constructed based on this, and then the temperature of the stator winding can be observed through the thermal network system state equation. Since the construction process of the thermal network system state equation refers to the relationship between the temperature of the PCB board and the temperature of the stator winding, even if the temperature sensor of the stator winding is removed, it is only necessary to collect the temperature of the PCB board to accurately observe the temperature of the stator winding.

[0011] In an integrated motor winding temperature measurement method provided in one of the embodiments of the present invention, the preset components include a stator winding, a controller, a PCB board, a stator core and an end cover, and the thermal resistance parameters include stator winding copper loss, thermal resistance between the stator winding and the stator core, thermal resistance between the stator core and the external environment, stator winding heat capacity, stator core heat capacity and stator core temperature, controller heat loss, thermal resistance between the PCB board and the end cover, thermal resistance between the end cover and the stator core, PCB board heat capacity, end cover heat capacity and end cover temperature.

[0012] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0013] By using the above-mentioned preset components and the thermal resistance parameters therebetween, the relationship between the temperature of the PCB board and the temperature between the stator windings can be accurately obtained.

[0014] In an integrated motor winding temperature measurement method provided in one embodiment of the present invention, the thermal resistance parameters between each preset component and each preset component are obtained according to the change curves of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor under the current over time, including:

[0015] According to the curve of stator winding temperature changing with time, the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature are determined. According to the curve of PCB board temperature and stator core temperature changing with time, the controller heat loss, the thermal resistance between the PCB board and the end cover, the thermal resistance between the end cover and the stator core, the PCB board heat capacity, the end cover heat capacity and the end cover temperature are determined.

[0016] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0017] By obtaining the curve of the stator winding temperature changing with time, the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature can be conveniently calculated. By the curve of the PCB board temperature and the stator core temperature changing with time, the controller heat loss, the thermal resistance between the PCB board and the end cover, the thermal resistance between the end cover and the stator core, the PCB board heat capacity, the end cover heat capacity and the end cover temperature can also be conveniently calculated.

[0018] In an integrated motor winding temperature measurement method provided in one embodiment of the present invention, according to a curve of stator winding temperature variation over time, the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature are determined, including:

[0019] A controller including a PCB board is thermally isolated from the stator winding, and a step current AC signal of a preset amplitude is input to the motor at preset intervals within a preset time period to obtain a curve of stator winding temperature change over time to determine the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature.

[0020] In an integrated motor winding temperature measurement method provided in one embodiment of the present invention, the controller heat consumption, the thermal resistance between the PCB board and the end cover, the thermal resistance between the end cover and the stator core, the PCB board heat capacity, the end cover heat capacity and the end cover temperature are determined according to the change curve of the PCB board temperature and the stator core temperature over time, including:

[0021] The thermal isolation between the controller and the stator winding is cancelled, and a step current AC signal of a preset amplitude is input to the motor at preset intervals within a preset time, so as to obtain the change curves of the PCB board temperature and the stator core temperature over time, and determine the heat consumption of the controller, the thermal resistance between the PCB board and the end cover, the thermal resistance between the end cover and the stator core, the thermal capacity of the PCB board, the thermal capacity of the end cover and the end cover temperature.

[0022] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0023] By isolating the controller and the stator winding, the parameters that affect the temperature of the stator winding, such as the copper loss of the stator winding, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the heat capacity of the stator winding, the heat capacity of the stator core and the temperature of the stator core, are measured and calculated. This can prevent the parameters from being affected by the temperature of the controller. Subsequently, the controller and the stator winding are combined to test and calculate the heat loss of the controller, the thermal resistance between the PCB board and the end cover, the thermal resistance between the end cover and the stator core, the heat capacity of the PCB board, the heat capacity of the end cover and the temperature of the end cover, so that the calculated parameters are more accurate.

[0024] In the integrated motor winding temperature measurement method provided in one embodiment of the present invention, the thermal network system state equation is:

[0025]

[0026]

[0027] C=[1 0 0 0 0],D=0

[0028] u=[PP c ] T

[0029] Where y = T1, x = [T1 T2 T3 T4 T0] T , T1 represents the stator winding temperature, T2 represents the stator core temperature, T3 represents the PCB board temperature, T4 represents the end cover temperature, T0 represents the external ambient temperature, P represents the stator winding copper loss, P C It represents the heat consumption of the controller, R1 represents the thermal resistance between the stator winding and the stator core, R2 represents the thermal resistance between the stator core and the external environment, R3 represents the thermal resistance between the PCB board and the end cover, R4 represents the thermal resistance between the end cover and the stator core, C1 represents the heat capacity of the stator winding, C2 represents the heat capacity of the stator core, C3 represents the heat capacity of the PCB board, and C4 represents the heat capacity of the end cover.

[0030] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0031] By using the above-mentioned state equation of the thermal network system, after obtaining parameters including stator winding copper loss, thermal resistance between the stator winding and the stator core, thermal resistance between the stator core and the external environment, stator winding heat capacity, stator core heat capacity and stator core temperature, controller heat loss, thermal resistance between the PCB board and the end cover, thermal resistance between the end cover and the stator core, PCB board heat capacity, end cover heat capacity and end cover temperature, the unknown quantity with only the PCB board temperature and the stator winding temperature can be obtained. At this time, the temperature of the stator winding can be accurately calculated and observed only by obtaining the PCB board temperature.

[0032] At least one embodiment of the present invention further provides an integrated motor winding temperature measurement system, comprising:

[0033] The test model inputs a current of a preset duration to the motor, and obtains the change curves of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor under the current over time;

[0034] The parameter identification module obtains the thermal resistance parameters between each preset component according to the change curves of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor current over time;

[0035] A thermal network system state equation building module is used to build a thermal network system state equation according to each preset component and the thermal resistance parameters between each preset component; wherein the thermal network system state equation characterizes the relationship between the PCB board temperature and the stator winding temperature;

[0036] The measurement module determines the stator winding temperature to be measured based on the real-time PCB board temperature collected in real time and through the thermal network system state equation.

[0037] In an integrated motor winding temperature measurement system provided by one of the embodiments of the present invention, the preset components in the parameter identification module include a stator winding, a controller, a PCB board, a stator core and an end cover, and the thermal resistance parameters include stator winding copper loss, thermal resistance between the stator winding and the stator core, thermal resistance between the stator core and the external environment, stator winding heat capacity, stator core heat capacity and stator core temperature, controller heat loss, thermal resistance between the PCB board and the end cover, thermal resistance between the end cover and the stator core, PCB board heat capacity, end cover heat capacity and end cover temperature.

[0038] The present invention also provides an electronic device, comprising a memory, a processor, and a program stored in the memory and running on the processor, wherein the processor implements the steps of the above-mentioned integrated motor winding temperature measurement method when executing the program.

[0039] The present invention also provides a vehicle, comprising the above-mentioned integrated motor winding temperature measurement system. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the process of the integrated motor winding temperature measurement method of the present invention;

[0041] Figure 2 It is a partial thermal network model diagram of the present invention;

[0042] Figure 3 It is the overall thermal network model diagram of the present invention;

[0043] Figure 4 is a curve diagram of the stator winding temperature changing with time of the present invention;

[0044] Figure 5 It is a curve diagram of the change of the PCB board temperature and the stator core temperature over time of the present invention;

[0045] Figure 6 The present invention is a flow chart of an integrated motor winding temperature measurement system. DETAILED DESCRIPTION

[0046] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0047] Furthermore, those skilled in the art may combine and associate different embodiments or examples and features of different embodiments or examples described in this specification without mutual contradiction.

[0048] Since the controller and motor housing are integrated, the controller temperature can also be used as a reference for the overall temperature. The controller temperature can be used as a real measurement to observe other variables in the integrated model.

[0049] Based on this, the present invention provides an integrated motor winding temperature observation method, please refer to Figure 1 As shown, including:

[0050] Input a current of a preset duration to the motor, and obtain a curve of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor under the current over time;

[0051] According to the change curves of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor under the current over time, the thermal resistance parameters between each preset component and each preset component are obtained;

[0052] According to the thermal resistance parameters of each preset component and between each preset component, a thermal network system state equation is constructed; wherein the thermal network system state equation characterizes the relationship between the PCB board temperature and the stator winding temperature;

[0053] According to the real-time PCB board temperature collected in real time, the stator winding temperature to be measured is determined through the thermal network system state equation.

[0054] By acquiring each change curve, the thermal resistance parameters between the preset components inside the motor and the preset components can be obtained, and a more sound thermal network system state equation can be constructed based on this, and then the temperature of the stator winding can be observed through the thermal network system state equation. Since the construction process of the thermal network system state equation refers to the relationship between the temperature of the PCB board and the temperature of the stator winding, even if the temperature sensor of the stator winding is removed, it is only necessary to collect the temperature of the PCB board to accurately observe the temperature of the stator winding.

[0055] Specifically, the preset components include stator winding, controller, PCB board, stator core and end cover, and the thermal resistance parameters include stator winding copper loss, thermal resistance between stator winding and stator core, thermal resistance between stator core and external environment, stator winding heat capacity, stator core heat capacity and stator core temperature, controller heat loss, thermal resistance between PCB board and end cover, thermal resistance between end cover and stator core, PCB board heat capacity, end cover heat capacity and end cover temperature.

[0056] By using the above-mentioned preset components and the thermal resistance parameters therebetween, the relationship between the temperature of the PCB board and the temperature between the stator windings can be accurately obtained.

[0057] Specifically, according to the change curves of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor under the current over time, the thermal resistance parameters between each preset component and each preset component are obtained, including:

[0058] According to the curve of stator winding temperature changing with time, the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature are determined. According to the curve of PCB board temperature and stator core temperature changing with time, the controller heat loss, the thermal resistance between the PCB board and the end cover, the thermal resistance between the end cover and the stator core, the PCB board heat capacity, the end cover heat capacity and the end cover temperature are determined.

[0059] According to the connection relationship between the stator winding, controller, PCB board, stator core and end cover, and the influence relationship on the stator winding temperature, the following can be established: Figure 3 The total thermal network model diagram shown in the figure, in which T1 represents the stator winding temperature, T2 represents the stator core temperature, T3 represents the PCB board temperature, T4 represents the end cover temperature, T0 represents the external ambient temperature, P represents the stator winding copper loss, P C It represents the heat consumption of the controller, R1 represents the thermal resistance between the stator winding and the stator core, R2 represents the thermal resistance between the stator core and the external environment, R3 represents the thermal resistance between the PCB board and the end cover, R4 represents the thermal resistance between the end cover and the stator core, C1 represents the heat capacity of the stator winding, C2 represents the heat capacity of the stator core, C3 represents the heat capacity of the PCB board, and C4 represents the heat capacity of the end cover.

[0060] At this time, by obtaining the curve of the stator winding temperature changing with time, the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature can be easily calculated. By the curve of the PCB board temperature and the stator core temperature changing with time, the controller heat loss, the thermal resistance between the PCB board and the end cover, the thermal resistance between the end cover and the stator core, the PCB board heat capacity, the end cover heat capacity and the end cover temperature can also be easily calculated.

[0061] Specifically, according to the curve of stator winding temperature changing with time, the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature are determined, including:

[0062] The controller including the PCB board is thermally isolated from the stator winding. In this example, the thermal isolation is achieved by connecting the PCB board in the controller and the motor with a long wire without direct contact. The test is conducted when the stator winding is heated alone, so that a step current AC signal of a preset amplitude is input to the motor at preset intervals within a preset time, and a curve of the stator winding temperature changing with time is obtained to determine the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature.

[0063] After the controller is thermally isolated from the stator winding, the thermal network model diagram of part of the motor has changed. At this time, the thermal network model diagram of part of the motor can be referred to Figure 2 As shown;

[0064] pass Figure 2 The thermal network model shown and the obtained curve of stator winding temperature change over time can be used to calculate the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature.

[0065] Subsequently, the thermal isolation between the controller and the stator winding is cancelled, that is, the PCB board is normally installed on the motor end cover to form an integrated assembly, and a step current AC signal of a preset amplitude is input to the motor at preset intervals within a preset time, and the change curves of the PCB board temperature and the stator core temperature over time are obtained to determine the heat consumption of the controller, the thermal resistance between the PCB board and the end cover, the thermal resistance between the end cover and the stator core, the thermal capacity of the PCB board, the thermal capacity of the end cover and the end cover temperature.

[0066] At this time, the overall thermal network model inside the motor is restored to Figure 3As shown, combined with the obtained PCB board temperature and stator core temperature change curve over time, the specific values ​​of the remaining parameters can be calculated. By isolating the controller and the stator winding, the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature that affect the stator winding temperature are measured and calculated, which can avoid the various parameters being affected by the temperature of the controller. Subsequently, the controller and the stator winding are combined to test and calculate the controller heat loss, the thermal resistance between the PCB board and the end cover, the thermal resistance between the end cover and the stator core, the PCB board heat capacity, the end cover heat capacity and the end cover temperature, so that the calculated parameters are more accurate.

[0067] Specifically, the state equation of the thermal network system is:

[0068]

[0069]

[0070] C=[1 0 0 0 0],D=0

[0071] u=[PP c ] T

[0072] Where y = T1, x = [T1 T2 T3 T4 T0] T ;

[0073] By using the above-mentioned state equation of the thermal network system, after obtaining parameters including stator winding copper loss, thermal resistance between the stator winding and the stator core, thermal resistance between the stator core and the external environment, stator winding heat capacity, stator core heat capacity and stator core temperature, controller heat loss, thermal resistance between the PCB board and the end cover, thermal resistance between the end cover and the stator core, PCB board heat capacity, end cover heat capacity and end cover temperature, the unknown quantity with only the PCB board temperature and the stator winding temperature can be obtained. At this time, the temperature of the stator winding can be accurately calculated and observed only by obtaining the PCB board temperature.

[0074] The heating of the circuit board will cause the temperature of the iron core to rise, affecting Figure 3 The parameter measurement of the overall thermal network model shown, so the parameter measurement is carried out in two steps;

[0075] The specific steps of the present invention include:

[0076] 1. Connect the PCB board and the motor with a long wire, without direct contact, and test when the stator winding is heated alone. Figure 2 The model parameters included in ;

[0077] 2. The test process is that the motor rotates at a certain speed (for example, 200rpm), and several step current AC signals with different amplitudes (for example, 40A, 60A and 80A) are input on the d-axis of the phase current. The duration is when the stator winding temperature exceeds 100 degrees and then stops, the current drops to 0A, and waits for the temperature to drop to about room temperature, and then inputs the next current value until all three current tests are completed;

[0078] 3. Obtain the stator winding temperature change curve over time based on the recorded data, such as Figure 4 As shown, combined with Figure 4 As well as the establishment of Figure 2 The partial thermal network model shown is Figure 2 Identify the parameters involved in

[0079] 4. Install the PCB board normally on the motor end cover to form an integrated assembly;

[0080] 5. Make the motor rotate at a certain speed (for example, 200rpm) again, input several step current AC signals of different amplitudes (for example, 40A, 60A and 80A) on the d-axis of the phase current, and stop when the stator winding temperature exceeds 100 degrees. The current drops to 0A, and waits for the temperature to drop to about room temperature, and then inputs the next current value until all three current tests are completed;

[0081] 6. Record the changes of PCB board temperature and stator core temperature over time, and obtain the change curve of PCB board temperature and stator core temperature over time based on the recorded data, such as Figure 5 As shown, combined with the change curves of the PCB board temperature and the stator core temperature over time, and Figure 3 The overall thermal network model shown identifies the parameters of the remaining parts of the model;

[0082] 7. Determine the state equation of the thermal network system based on all the parameters obtained by identification;

[0083] 8. According to the actual temperature collected on the PCB board, it is brought into the thermal network system state equation to calculate the temperature of the motor stator winding.

[0084] The present invention also provides an integrated motor winding temperature measurement system, please refer to Figure 6 As shown, including:

[0085] The test model inputs a current of a preset duration to the motor, and obtains the change curves of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor under the current over time;

[0086] The parameter identification module obtains the thermal resistance parameters between each preset component according to the change curves of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor current over time;

[0087] A thermal network system state equation building module is used to build a thermal network system state equation according to each preset component and the thermal resistance parameters between each preset component; wherein the thermal network system state equation characterizes the relationship between the PCB board temperature and the stator winding temperature;

[0088] The measurement module determines the stator winding temperature to be measured based on the real-time PCB board temperature collected in real time and through the thermal network system state equation.

[0089] Specifically, the preset components in the parameter identification module include stator winding, controller, PCB board, stator core and end cover, and the thermal resistance parameters include stator winding copper loss, thermal resistance between stator winding and stator core, thermal resistance between stator core and external environment, stator winding heat capacity, stator core heat capacity and stator core temperature, controller heat loss, thermal resistance between PCB board and end cover, thermal resistance between end cover and stator core, PCB board heat capacity, end cover heat capacity and end cover temperature.

[0090] Specifically, the parameter identification module includes:

[0091] According to the curve of stator winding temperature changing with time, the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature are determined. According to the curve of PCB board temperature and stator core temperature changing with time, the controller heat loss, the thermal resistance between the PCB board and the end cover, the thermal resistance between the end cover and the stator core, the PCB board heat capacity, the end cover heat capacity and the end cover temperature are determined.

[0092] Specifically, the parameter identification module includes:

[0093] A controller including a PCB board is thermally isolated from the stator winding, and a step current AC signal of a preset amplitude is input to the motor at preset intervals within a preset time period to obtain a curve of stator winding temperature change over time to determine the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature.

[0094] Specifically, the parameter identification module includes:

[0095] The thermal isolation between the controller and the stator winding is cancelled, and a step current AC signal of a preset amplitude is input to the motor at preset intervals within a preset time, so as to obtain the change curves of the PCB board temperature and the stator core temperature over time, and determine the heat consumption of the controller, the thermal resistance between the PCB board and the end cover, the thermal resistance between the end cover and the stator core, the thermal capacity of the PCB board, the thermal capacity of the end cover and the end cover temperature.

[0096] Specifically, the thermal network system state equation in the thermal network system state equation establishment module is:

[0097]

[0098]

[0099] C=[1 0 0 0 0],D=0

[0100] u=[PP c ] T

[0101] Where y = T1, x = [T1 T2 T3 T4 T0] T , T1 represents the stator winding temperature, T2 represents the stator core temperature, T3 represents the PCB board temperature, T4 represents the end cover temperature, T0 represents the external ambient temperature, P represents the stator winding copper loss, P C It represents the heat consumption of the controller, R1 represents the thermal resistance between the stator winding and the stator core, R2 represents the thermal resistance between the stator core and the external environment, R3 represents the thermal resistance between the PCB board and the end cover, R4 represents the thermal resistance between the end cover and the stator core, C1 represents the heat capacity of the stator winding, C2 represents the heat capacity of the stator core, C3 represents the heat capacity of the PCB board, and C4 represents the heat capacity of the end cover.

[0102] The present invention also provides an electronic device, comprising a memory, a processor, and a program stored in the memory and running on the processor, wherein the processor implements the steps of the above-mentioned integrated motor winding temperature measurement method when executing the program.

[0103] The present invention also provides a vehicle, comprising the above-mentioned integrated motor winding temperature measurement system.

[0104] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An integrated motor winding temperature measurement method, characterized in that: include: Input a current of a preset duration to the motor, and obtain a curve of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor under the current over time; According to the change curves of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor under the current over time, the thermal resistance parameters between each preset component and each preset component are obtained; According to the thermal resistance parameters of each preset component and between each preset component, a thermal network system state equation is constructed; wherein the thermal network system state equation characterizes the relationship between the PCB board temperature and the stator winding temperature; According to the real-time PCB board temperature collected in real time, the stator winding temperature to be measured is determined through the thermal network system state equation.

2. The integrated motor winding temperature measurement method according to claim 1, characterized in that: The preset components include stator winding, controller, PCB board, stator core and end cover. The thermal resistance parameters include stator winding copper loss, thermal resistance between stator winding and stator core, thermal resistance between stator core and external environment, stator winding heat capacity, stator core heat capacity and stator core temperature, controller heat loss, thermal resistance between PCB board and end cover, thermal resistance between end cover and stator core, PCB board heat capacity, end cover heat capacity and end cover temperature.

3. The integrated motor winding temperature measurement method according to claim 2, characterized in that: According to the change curves of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor under the current over time, the thermal resistance parameters between each preset component and each preset component are obtained, including: According to the curve of stator winding temperature changing with time, the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature are determined. According to the curve of PCB board temperature and stator core temperature changing with time, the controller heat loss, the thermal resistance between the PCB board and the end cover, the thermal resistance between the end cover and the stator core, the PCB board heat capacity, the end cover heat capacity and the end cover temperature are determined.

4. The integrated motor winding temperature measurement method according to claim 3, characterized in that: According to the curve of stator winding temperature changing with time, determine the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature, including: A controller including a PCB board is thermally isolated from the stator winding, and a step current AC signal of a preset amplitude is input to the motor at preset intervals within a preset time period to obtain a curve of stator winding temperature change over time to determine the stator winding copper loss, the thermal resistance between the stator winding and the stator core, the thermal resistance between the stator core and the external environment, the stator winding heat capacity, the stator core heat capacity and the stator core temperature.

5. The integrated motor winding temperature measurement method according to claim 4, characterized in that: According to the curve of the change of PCB board temperature and stator core temperature over time, determine the controller heat loss, thermal resistance between PCB board and end cover, thermal resistance between end cover and stator core, PCB board heat capacity, end cover heat capacity and end cover temperature, including: The thermal isolation between the controller and the stator winding is cancelled, and a step current AC signal of a preset amplitude is input to the motor at preset intervals within a preset time, so as to obtain the change curves of the PCB board temperature and the stator core temperature over time, and determine the heat consumption of the controller, the thermal resistance between the PCB board and the end cover, the thermal resistance between the end cover and the stator core, the thermal capacity of the PCB board, the thermal capacity of the end cover and the end cover temperature.

6. The integrated motor winding temperature measurement method according to claim 1, characterized in that: The state equation of the thermal network system is: C=[10000],D=0 u=[P P c ]T Where y = T1, x = [T1 T2 T3 T4 T0] T , T1 represents the stator winding temperature, T2 represents the stator core temperature, T3 represents the PCB board temperature, T4 represents the end cover temperature, T0 represents the external ambient temperature, P represents the stator winding copper loss, P C It represents the heat consumption of the controller, R1 represents the thermal resistance between the stator winding and the stator core, R2 represents the thermal resistance between the stator core and the external environment, R3 represents the thermal resistance between the PCB board and the end cover, R4 represents the thermal resistance between the end cover and the stator core, C1 represents the heat capacity of the stator winding, C2 represents the heat capacity of the stator core, C3 represents the heat capacity of the PCB board, and C4 represents the heat capacity of the end cover.

7. An integrated motor winding temperature measurement system, characterized in that: include: The test model inputs a current of a preset duration to the motor, and obtains the change curves of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor under the current over time; The parameter identification module obtains the thermal resistance parameters between each preset component according to the change curves of the stator winding temperature, PCB board temperature, and stator core temperature corresponding to the motor current over time; A thermal network system state equation building module is used to build a thermal network system state equation according to each preset component and the thermal resistance parameters between each preset component; wherein the thermal network system state equation characterizes the relationship between the PCB board temperature and the stator winding temperature; The measurement module determines the stator winding temperature to be measured based on the real-time PCB board temperature collected in real time and through the thermal network system state equation.

8. The integrated motor winding temperature measurement system according to claim 7, characterized in that: The preset components in the parameter identification module include stator winding, controller, PCB board, stator core and end cover. The thermal resistance parameters include stator winding copper loss, thermal resistance between stator winding and stator core, thermal resistance between stator core and external environment, stator winding heat capacity, stator core heat capacity and stator core temperature, controller heat loss, thermal resistance between PCB board and end cover, thermal resistance between end cover and stator core, PCB board heat capacity, end cover heat capacity and end cover temperature.

9. An electronic device comprising a memory, a processor, and a program stored in the memory and running on the processor, characterized in that: When the processor executes the program, the steps of the integrated motor winding temperature measurement method according to any one of claims 1 to 6 are implemented.

10. A vehicle, characterized in that: It comprises the integrated motor winding temperature measurement system as claimed in claim 7 or 8.

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