Motor rotor temperature rise test structure

Abstract

The application relates to the technical field of motor rotor temperature detection, in particular to a motor rotor temperature rise test structure. The motor rotor temperature rise test structure comprises a rotating shaft, a plurality of rotor cores, a rotor pressing plate, a connecting tool and a plurality of temperature sensors, the rotating shaft is provided with a first channel, the rotor core is provided with a plurality of axial through magnetic steel grooves and glue overflow grooves, the glue overflow grooves of adjacent rotor cores are partially overlapped in the axial direction to form a second channel, the rotor pressing plate is provided with a third channel arranged along the radial direction, one end of the third channel is communicated with the first channel, and the other end of the third channel is communicated with the second channel, the connecting tool is fixedly connected with the end of the rotating shaft, the connecting tool is provided with a temperature rise recorder, the plurality of temperature sensors are installed on different circumferential positions in the second channel, and the temperature sensors are connected with the temperature rise recorder. The test tool of the application is simple in structure, can accurately obtain the temperature rise of the rotor assembly under the working state without damaging the rotor assembly.

Description

Technical Field

[0001] This invention relates to the field of motor rotor temperature detection technology, specifically to a motor rotor temperature rise testing structure. Background Technology

[0002] As one of the core components of an electric vehicle's three-electric system (battery, motor, and electronic control), the motor's operating condition is greatly affected by temperature. On the one hand, high temperatures cause changes in the material properties of permanent magnet motors, leading to significant changes in core and rotor losses, thus reducing motor efficiency. On the other hand, excessive motor temperature rise can cause irreversible demagnetization of the permanent magnets and damage to the core insulation varnish. By measuring and monitoring the motor rotor temperature rise to confirm whether the peak temperature rise reaches the limit, improvements can be made to the motor's electromagnetic system or the cooling system can be strengthened to further enhance motor efficiency and durability.

[0003] The difficulty in monitoring the temperature rise of a motor rotor lies in the fact that the motor rotor rotates at high speed during operation, making it impossible to install temperature monitoring equipment on high-speed rotating components under normal circumstances. To solve this technical problem, a Chinese invention patent with patent number "CN112242780A," entitled "Permanent Magnet Synchronous Motor with Rotor Temperature Measurement Device," provides a structure for monitoring the temperature changes of a motor rotor. This motor structure includes a permanent magnet synchronous motor body, a temperature sensor, a flange shaft with a flange at one end, a slip ring, a slip ring fixing bracket, and a temperature monitoring instrument. Temperature measurement points are distributed on the rotor core end face and the rotor permanent magnet end face of the permanent magnet synchronous motor body. Threaded holes are drilled at the temperature measurement points, and the temperature sensor is fixed in the threaded holes of the temperature measurement points through threaded connections. The rotating shaft of the permanent magnet synchronous motor body has a central shaft hole and an oblique hole. The flange shaft is fixed to the end face of the rotating shaft, and a signal line through hole is opened on the flange of the flange shaft. The rotor of the slip ring is fixed to the flange shaft, and the signal line of the temperature sensor is led out through the oblique hole, the central shaft hole, and the signal line through hole, and connected to the rotor lead-out line of the slip ring. Temperature sensing points for the inner ring of the bearing are distributed on the end face of the shaft. Threaded holes are drilled around these points, and temperature sensors are fixed within these holes. Since the temperature sensors are directly mounted on the rotor, and signal lines are led out through the shaft, the temperature monitoring equipment rotates with the shaft, allowing the sensors to monitor the rotor's temperature changes in real time. This structure solves the problem of temperature monitoring in high-speed rotating rotors, but it also has several drawbacks.

[0004] To accommodate the temperature sensor, this structure requires threaded holes on the end faces of the rotor core and the rotor permanent magnet, which would damage the original rotor structure and electromagnetic design. Furthermore, the measurement points in the above technical solutions are all rearranged, making it difficult to utilize the existing rotor structure, resulting in significant damage and hindering widespread adoption. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide a motor rotor temperature rise testing structure.

[0006] The technical solution of this invention is: a motor rotor temperature rise testing structure, comprising,

[0007] A rotating shaft, on which a first through channel is provided;

[0008] Multiple rotor cores are sleeved on a rotating shaft to form a rotor assembly. Multiple axially penetrating magnetic slots and glue overflow slots are provided on the rotor cores. The glue overflow slots and magnetic slots are interconnected. The glue overflow slots of adjacent rotor cores partially overlap in the axial direction to form a second channel that axially penetrates the rotor assembly. The glue overflow slots on the second channel are arranged equidistantly along the circumference of the rotating shaft.

[0009] The rotor pressure plate is located at both ends of the rotor assembly. The rotor pressure plate is provided with a third channel arranged radially. One end of the third channel is connected to the first channel and the other end is connected to the second channel.

[0010] A connecting fixture is fixedly connected to the end of the rotating shaft, and a temperature rise recorder is installed on the connecting fixture.

[0011] Multiple temperature sensors are installed at different circumferential positions within the second channel. The temperature sensors are connected to the temperature rise recorder via wire harnesses that pass sequentially through the second, third, and first channels.

[0012] According to the motor rotor temperature rise test structure provided in this application, the second channel is provided with multiple temperature sensors that correspond one-to-one with multiple rotor cores; adjacent temperature sensors are arranged alternately in the axial and circumferential directions.

[0013] According to the motor rotor temperature rise test structure provided in this application, the rotor core has multiple sets of overflow grooves arranged at equal intervals along the circumference.

[0014] According to the motor rotor temperature rise test structure provided in this application, the first channel includes,

[0015] An axial hole, one end of which is located near the end of the connecting tooling on the rotating shaft, and the other end extends axially to the position on the rotating shaft where the rotor pressure plate is installed;

[0016] A radial hole, one end of which is connected to the other end of an axial hole, and the other end of which passes through a rotating shaft radially.

[0017] According to the motor rotor temperature rise test structure provided in this application, the rotating shaft is provided with a plurality of radial holes, which are distributed at equal intervals along the circumference of the rotating shaft.

[0018] According to the motor rotor temperature rise test structure provided in this application, the third channel includes,

[0019] The wire groove is disposed on the axial end face of the rotor pressure plate facing the rotor assembly. One end of the wire groove is connected to the radial hole, and the other end extends radially to the position of the corresponding second channel and is connected to the second channel.

[0020] According to the motor rotor temperature rise test structure provided in this application, one end of the connecting fixture is fixedly connected to the rotating shaft via a spline at the end of the rotating shaft, and the other end is rotatably connected to the motor housing via a bearing. The connecting fixture has a hollow cavity with one end connected to the first channel. The hollow cavity has multiple through holes for wire harnesses to pass through, connecting the inner and outer sides of the connecting fixture.

[0021] According to the motor rotor temperature rise test structure provided in this application, the temperature rise recorder includes,

[0022] The first recorder is fixed on the outer circumferential surface of the connecting fixture and connected to a wire harness passing through the connecting fixture;

[0023] The second recorder is wirelessly connected to the first recorder.

[0024] The advantages of this application are: 1. This application uses the glue overflow groove on the rotor core as the channel structure for temperature sensors and wire harness arrangement, which will not cause any damage to the original rotor core structure. Moreover, the glue overflow groove and the magnet groove are interconnected, which can monitor the temperature of the rotor core and multiple magnets. At the same time, the glue overflow grooves of adjacent rotor cores are partially overlapped, which can monitor the temperature of multiple axial and multiple radial positions on the rotor assembly. The monitoring range is wider, the temperature rise of the rotor assembly is more comprehensive, the overall structure is simple, easy to use, and greatly improves the accuracy of rotor assembly temperature rise monitoring.

[0025] 2. This application sets up multiple temperature sensors in the second channel that correspond one-to-one with the rotor core, that is, each rotor core can be monitored by the corresponding temperature sensor. At the same time, adjacent temperature sensors are staggered in the circumferential and axial directions. This arrangement can obtain the temperature changes of the rotor assembly at the same circumferential position and different axial positions, providing good data support for accurate analysis of the temperature rise of the rotor assembly.

[0026] 3. This application sets multiple sets of circumferentially equidistant glue overflow grooves on the rotor core, which can form multiple sets of second channels on the rotor assembly. Temperature sensors can be arranged in different second channels according to actual needs. During the temperature rise monitoring process, they can be compared with each other, which facilitates accurate analysis of the temperature rise of the rotor assembly.

[0027] 4. The first channel structure of this application is extremely simple. The first channel structure that passes through the rotating shaft is formed by axial holes and radial holes, which facilitates the passage of wire harnesses. The arrangement of axial holes and radial holes is simple, and it is extremely easy for wire harnesses to pass through.

[0028] 5. This application provides multiple radial holes on the rotating shaft, which are arranged at equal intervals along the circumference, making it easier for the wire harness to enter the interior of the rotating shaft through the third channel. This simplifies the installation of the rotor pressure plate and the rotating shaft, and makes it easier to align them.

[0029] 6. This application provides a wire groove on the rotor pressure plate to facilitate the passage of the wire harness. The wire groove is located on the side of the rotor pressure plate facing the rotor assembly, and its position is concealed so that the wire harness will not be exposed and affect the operation of the rotor assembly. Moreover, the arrangement structure is simple.

[0030] 7. The connection fixture structure of this application is simple. One end is fixedly connected to the rotating shaft, which makes it easy to rotate together with the rotating shaft. The other end is rotatably supported on the motor housing through the bearing. The connection fixture structure is stable and will not cause the problem of instability due to cantilever. At the same time, it facilitates the connection and arrangement of the wiring harness and temperature rise recorder.

[0031] 8. The temperature rise recorder of this application includes a first recorder and a second recorder, which can effectively avoid the problem of signal interference, facilitate the collection of temperature data, and make the layout of power supply equipment simpler.

[0032] The test fixture of this application has a simple structure and is easy to use. It can accurately obtain the temperature rise of the rotor assembly under working conditions without damaging the rotor assembly, and will not have an adverse effect on the magnetic field of the rotor assembly. It has great promotional value. Attached Figure Description

[0033] Figure 1 : A schematic diagram of the arrangement structure of the motor and connecting tooling in this application;

[0034] Figure 2 Side view of the motor in this application;

[0035] Figure 3 This application Figure 2 AA view;

[0036] Figure 4 : A schematic diagram of the rotor core structure of this application;

[0037] Figure 5 : Schematic diagram of the first channel arrangement structure of the rotating shaft in this application;

[0038] Figure 6 : A schematic diagram of the rotor pressure plate structure of this application;

[0039] Figure 7: A schematic diagram of the connecting tooling in this application;

[0040] Wherein: 1—shaft; 2—rotor core; 3—magnetic slot; 4—glue overflow slot; 5—rotor pressure plate; 6—connecting fixture; 7—temperature sensor; 8—wire harness; 9—axial hole; 10—radial hole; 11—wire slot; 12—first recorder; 13—second recorder; 14—steel ring. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0045] This application relates to a motor rotor temperature rise testing structure for real-time temperature rise monitoring of the motor rotor assembly. The testing fixture of this application monitors the temperature change of the rotor assembly in real time under high-speed rotor rotation. The temperature sensor is arranged in the original structure of the rotor assembly, without the need to slot or open holes in the rotor assembly, and will not cause any damage to the rotor assembly or destroy the designed magnetic field structure of the rotor assembly. The overall testing process is simple and the measurement results are accurate.

[0046] Specifically, the structure of the motor rotor temperature rise test structure in this application is as follows: Figures 1-7As shown, the assembly includes a rotating shaft 1, multiple rotor cores 2, a rotor pressure plate 5, a connecting fixture 6, and multiple temperature sensors 7. The rotating shaft 1, rotor cores 2, and rotor pressure plate 5 are the original structure of the motor. The rotor assembly of this application includes multiple rotor cores 2, which are sleeved on the rotating shaft 1 and pressed axially by the rotor pressure plates 5 at both ends to prevent slippage between adjacent rotor cores 2. To prevent axial movement of the rotor pressure plate 5, a steel ring 14 is sleeved on the rotating shaft 1. The steel ring 14 is interference-fitted with the rotating shaft 1 and is located on the side of the rotor pressure plate 5 facing away from the rotor assembly. The steel ring 14 restricts the axial movement of the rotor pressure plate 5, so that the rotor pressure plate 5 and the rotor assembly are stably fixed on the rotating shaft 1.

[0047] The rotor core 2 of this application is provided with multiple sets of magnet slots 3 and glue overflow slots 4, such as Figure 4 As shown, each set of magnetic steel grooves 3 and glue overflow grooves 4 includes two magnetic steel grooves 3 and two glue overflow grooves 4. The magnetic steel grooves 3 and glue overflow grooves 4 in the same set correspond one-to-one, and the corresponding magnetic steel grooves 3 and glue overflow grooves 4 are interconnected. The magnetic steel groove 3 is a through hole for installing the magnetic field. The magnet is fixed in the magnetic field groove 3 by adhesive. Excess adhesive will flow into the glue overflow groove 4 to avoid affecting the magnet. In addition, the glue overflow groove 4 forms an air groove structure, which can form a magnetic shielding structure. Other functions of the glue overflow groove 4 will not be described in detail here.

[0048] The rotor assembly of this application includes multiple rotor cores 2, which are stacked and closely arranged axially to form the rotor assembly. The glue overflow grooves 4 of adjacent rotor cores 2 partially overlap in the axial direction to form a second channel that axially penetrates the rotor assembly. Figure 2 As shown, partial overlap means that the glue overflow grooves 4 of adjacent rotor cores 2 are located at different circumferential angles on the rotating shaft 1. Assuming the area of ​​one glue overflow groove 4 is 'a', the area of ​​the through hole formed by the glue overflow grooves 4 of adjacent rotor cores 2 may be a / 2 or a / 3. The glue overflow grooves 4 on the second channel are arranged equidistantly along the circumference of the rotating shaft 1, that is, the second channel formed is a continuous arc-shaped structure or a continuous spiral structure in the circumferential direction of the rotating shaft 1. The glue overflow grooves 4 on the rotor cores 2 at both ends are located at the two ends of the second channel in the circumferential direction, and the glue overflow grooves in the middle are arranged at equal intervals along the circumferential direction.

[0049] In order to accurately and in real-time monitor the temperature of the rotor assembly, this application arranges multiple temperature sensors 7 in the second channel of the rotor assembly. The multiple temperature sensors 7 are installed at different circumferential positions in the second channel, and the temperature sensors 7 are connected to an external temperature rise recorder via a wiring harness. The wiring harness passes through the rotor pressure plate 5 and the shaft 1.

[0050] This application has a first channel on the rotating shaft 1 and a third channel on the rotor pressure plate 5. The third channel is connected to the first channel and the second channel respectively. The temperature sensor 7 in the second channel is connected to the temperature rise recorder through the wire harness 8 passing through the second channel, the third channel and the first channel.

[0051] The temperature rise recorder is installed on the connecting fixture 6, which is an external structure that rotates with the rotating shaft 1. The wiring harness 8 passes through the connecting fixture 6 and connects to the temperature rise recorder, transmitting the parameters collected by the temperature sensor 7 to the temperature rise recorder.

[0052] During the temperature rise monitoring of the rotor assembly, the temperature sensor 7, wiring harness 8, and temperature rise recorder all rotate together with it. Relative to the rotating shaft 1 and rotor core 2, the temperature sensor 7, wiring harness 8, and temperature rise recorder are all stationary, thus enabling stable temperature monitoring of the rotor core 2.

[0053] In some embodiments of this application, the temperature sensor 7 described above has been optimized. Specifically, multiple temperature sensors 7 corresponding to multiple rotor cores 2 are provided in the second channel, and adjacent temperature sensors 7 are staggered in the axial and circumferential directions.

[0054] This means that each rotor core 2 has a corresponding temperature sensor 7 to monitor the temperature rise, and the adjacent temperature sensors 7 are staggered in the axial and circumferential directions. The temperature changes at different axial and circumferential positions are monitored by two adjacent temperature sensors 7. Finally, when analyzing the temperature changes of the rotor assembly, a comprehensive analysis can be performed by analyzing the temperature changes at different axial and circumferential positions. The analysis results can more accurately reflect the actual situation of the rotor assembly during operation.

[0055] In addition, in this embodiment, the rotor core 2 has multiple sets of glue overflow grooves 4 arranged at equal intervals along the circumference. That is, each set of glue overflow grooves 4 can form a second channel structure with the glue overflow grooves 4 on the adjacent rotor core 2. See [link to documentation]. Figure 4 The schematic diagram of the rotor core 2 shown is shown.

[0056] In other embodiments of this application, the first channel structure described above has been optimized, specifically, as follows: Figure 3 and 5 As shown, the first channel includes an axial hole 9 and a radial hole 10. One end of the axial hole 9 is located near the end of the connecting tool 6 on the rotating shaft 1, and the other end extends axially to the position where the rotor pressure plate 5 is installed on the rotating shaft 1. One end of the radial hole 10 is connected to the other end of the axial hole 9, and the other end of the radial hole 10 passes through the rotating shaft 1 radially.

[0057] Axial hole 9 is located at the center of the rotating shaft and is coaxial with the rotating shaft 1. Radial hole 10 forms an L-shaped channel structure with axial hole 9. Multiple radial holes 10 are provided on the rotating shaft 1, and the multiple radial holes 10 are distributed at equal intervals along the circumference of the rotating shaft 1. This facilitates the arrangement of rotor pressure plate 5 and facilitates the connection between the third channel on rotor pressure plate 5 and the inlet opening 10.

[0058] In a further embodiment of this application, the above-described third channel structure has been optimized, specifically, as follows: Figure 3 and 6 As shown, the third channel includes a wire groove 11, which is disposed on the axial end face of the rotor pressure plate 5 facing the rotor assembly. One end of the wire groove 11 is connected to the radial hole 10, and the other end extends radially to the position corresponding to the second channel and is connected to the second channel.

[0059] Similarly, in this embodiment, a plurality of wire grooves 11 are provided on the side of the rotor pressure plate 5 facing the rotor assembly. The plurality of wire grooves 11 are arranged at equal intervals along the circumference, and the plurality of guide grooves 11 facilitate the connection of the corresponding radial holes 10 with the second channel.

[0060] In a preferred embodiment of this application, the structure of the connecting tool 6 has been optimized, specifically, as follows: Figure 1 and 7 As shown, one end of the connecting fixture 6 is fixedly connected to the rotating shaft 1 via the spline at the end of the rotating shaft 1, and the other end is rotatably connected to the motor housing via a bearing. The connecting fixture 6 has a hollow cavity with one end connected to the first channel. Multiple through holes are opened on the hollow cavity to allow the wire harness 8 to pass through, connecting the inner and outer sides of the connecting fixture 6.

[0061] Two shafts are respectively provided at both ends of the connecting fixture 6. One shaft is hollow, and its inner end is provided with a keyway structure corresponding to the spline at the end of the rotating shaft 1. After the spline at the end of the rotating shaft 1 is inserted into the keyway, it can be connected and fixed in the direction of rotation around the axis. The other shaft is a solid structure, and a deep groove bearing is provided on the shaft. A bracket is installed on the motor housing. The shaft is rotatably connected to the bracket through the deep groove bearing. The bracket supports the shaft and prevents one end of the connecting fixture 6 from being suspended. The combination structure of the bracket and the deep groove bearing can improve the structural stability of the entire connecting fixture 6.

[0062] The body of the connecting fixture 6 is a hollow cavity. The wire harness 8 passes through the axial hole 9 of the rotating shaft 1 and enters the hollow cavity. Then it passes out of the hollow cavity and connects to the temperature rise recorder on the outside.

[0063] In some embodiments of this application, the temperature rise recorder described above has been optimized, specifically, as follows: Figure 1As shown, the temperature rise recorder includes a first recorder 12 and a second recorder 13. The first recorder 12 is fixed on the outer circumferential surface of the connecting fixture 6 and connected to the wire harness 8 passing through the connecting fixture 6; the second recorder 13 is wirelessly connected to the first recorder 12.

[0064] Multiple first recorders 12 are distributed circumferentially on the outer end face of the connecting fixture 6 body and rotate with the connecting fixture 6. The second recorder 13 is a ring-shaped structure, surrounding the outside of the connecting fixture 6, and has no direct contact with the connecting fixture 6, which is fixed to a certain position on the outside of the motor housing. The temperature information received by the first recorder 12 is transmitted wirelessly to the second recorder 13.

[0065] In actual use, the temperature sensor 7 is installed in the glue overflow groove 4 of the rotor core 2. Then, the rotor core 2 is arranged into a rotor assembly according to the set staggered arrangement. The rotor assembly is fitted onto the rotating shaft 1. Rotor pressure plates 5 are installed at both ends of the rotor assembly. The wire harness 8 is arranged in the wire groove 11. Then, the wire harness 8 passes through the radial hole 10 and the axial hole 9 and exits from the end of the rotating shaft 1. A steel ring 14 is installed on the rotating shaft 1 to press the rotor assembly and the rotor pressure plate 5 together. A spline connection fixture 6 is used to connect the end of the rotating shaft 1. The other end of the connecting fixture 6 is supported by a bracket. The wire harness passes through the connecting fixture 6 and enters the hollow cavity of the connecting fixture. It exits from the hollow cavity and connects to the first recorder 12 outside the connecting fixture 6.

[0066] When the motor is in normal use, the temperature change of the rotor core 2 is collected by the temperature sensor 7 and transmitted to the first recorder 12 via the wiring harness 8. The first recorder 12 then transmits the data wirelessly to the second recorder 13.

[0067] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A structure for testing the temperature rise of a motor rotor, characterized in that: include, A rotating shaft (1) is provided with a through first channel; Multiple rotor cores (2) are sleeved on a rotating shaft (1) to form a rotor assembly. Multiple axially penetrating magnetic steel grooves (3) and overflow grooves (4) are provided on the rotor cores (2). The overflow grooves (4) and magnetic steel grooves (3) are interconnected. The overflow grooves (4) of adjacent rotor cores (2) partially overlap in the axial direction to form a second channel that axially penetrates the rotor assembly. The overflow grooves (4) on the second channel are arranged equidistantly along the circumference of the rotating shaft (1). Rotor pressure plate (5), the rotor pressure plate (5) is located at both ends of the rotor assembly, and a third channel is arranged radially on the rotor pressure plate (5), one end of the third channel is connected to the first channel and the other end is connected to the second channel; A connecting fixture (6) is fixedly connected to the end of the rotating shaft (1), and a temperature rise recorder is provided on the connecting fixture (6); Multiple temperature sensors (7) are installed at different circumferential positions in the second channel. The temperature sensors (7) are connected to the temperature rise recorder through a wire harness (8) that passes through the second channel, the third channel and the first channel in sequence.

2. The motor rotor temperature rise test structure as described in claim 1, characterized in that: The second channel is equipped with multiple temperature sensors (7) that correspond one-to-one with multiple rotor cores (2); adjacent temperature sensors (7) are arranged alternately in the axial and circumferential directions.

3. The motor rotor temperature rise test structure as described in claim 1, characterized in that: Multiple sets of overflow grooves (4) are provided on the rotor core (2) and are equidistantly arranged along the circumference.

4. The motor rotor temperature rise test structure as described in claim 1, characterized in that: The first channel includes, An axial hole (9) is provided, with one end located on the shaft (1) near the connecting fixture (6) and the other end extending axially to the position where the rotor pressure plate (5) is mounted on the shaft (1). A radial hole (10) is provided, one end of which is connected to the other end of an axial hole (9), and the other end of the radial hole (10) passes through a rotating shaft (1) radially.

5. The motor rotor temperature rise test structure as described in claim 4, characterized in that: The rotating shaft (1) is provided with a plurality of radial holes (10), which are distributed at equal intervals along the circumference of the rotating shaft (1).

6. A motor rotor temperature rise test structure as described in claim 4 or 5, characterized in that: The third channel includes, The wire groove (11) is provided on the axial end face of the rotor pressure plate (5) facing the rotor assembly. One end of the wire groove (11) is connected to the radial hole (10), and the other end extends radially to the position corresponding to the second channel and is connected to the second channel.

7. The motor rotor temperature rise test structure as described in claim 1, characterized in that: One end of the connecting fixture (6) is fixedly connected to the rotating shaft (1) via the spline at the end of the rotating shaft (1), and the other end is rotatably connected to the motor housing via a bearing. The connecting fixture (6) has a hollow cavity with one end connected to the first channel. The hollow cavity has multiple through holes that connect the inner and outer sides of the connecting fixture (6) for the wire harness (8) to pass through.

8. The motor rotor temperature rise test structure as described in claim 1, characterized in that: The temperature rise recorder includes, The first recorder (12) is fixed on the outer circumferential surface of the connecting fixture (6) and connected to the wire harness (8) passing through the connecting fixture (6); The second recorder (13) is wirelessly connected to the first recorder (12).

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