Rotor core, motor and vehicle

Abstract

The invention belongs to the technical field of motors, and particularly relates to a rotor core, a motor and a vehicle, the rotor core comprises a plurality of rotor punching sheets, each rotor punching sheet comprises a punching sheet body, and mounting holes and wiring holes which are arranged in the axial direction of the punching sheet body in a penetrating manner, and the mounting holes and the wiring holes are arranged at intervals or at least partially coincide; the adjacent punching sheet bodies are arranged in a staggered manner in the circumferential direction, and the wiring holes in the adjacent punching sheet bodies are at least partially overlapped and communicated; the mounting hole is used for mounting magnetic steel, and the wiring hole is used for arranging a temperature measuring device in a penetrating manner; the temperature measuring device can be inserted into a wiring hole of the rotor core. According to the scheme, the temperature of the magnetic steel can be obtained more accurately and efficiently in real time through the temperature measuring device.

Description

Technical Field

[0001] This application belongs to the technical field of motors, and particularly relates to a rotor core, a motor, and a vehicle. Background Art

[0002] The permanent magnet synchronous motor (PMSM) system has the characteristics of high control precision, high torque density, good torque smoothness, and low noise. By reasonably designing the permanent magnet magnetic circuit structure, higher field weakening performance can be obtained, and the speed regulation range of the motor can be improved. Therefore, it has good application value in the drive of electric vehicles.

[0003] Among them, the magnetic field of the permanent magnet synchronous motor is provided by the permanent magnets on the rotor. Magnetic materials generally have the problem of demagnetization at high temperatures. After the permanent magnet synchronous motor reaches a certain temperature, the permanent magnets will undergo irreversible demagnetization, which will lead to the performance attenuation and shortened life of the permanent magnet synchronous motor, making it unable to output normal mechanical performance, and finally resulting in insufficient power of the whole vehicle.

[0004] Therefore, accurately measuring the rotor temperature of the permanent magnet synchronous motor to establish an accurate rotor temperature model is very important for improving control precision, performance guarantee, reliability, and life in the motor drive system. Summary of the Invention

[0005] The purpose of this application is to provide a rotor core, a motor, and a vehicle, which can accurately and real-time obtain the temperature inside the rotor core.

[0006] The first aspect of this application provides a rotor core, which includes:

[0007] A plurality of rotor punching sheets, each of the rotor punching sheets includes a punching sheet body, and an installation hole and a wiring hole axially penetrating through the punching sheet body. The installation hole and the wiring hole are arranged at intervals or at least partially overlap; adjacent punching sheet bodies are staggered in their circumferences, and the wiring holes on adjacent punching sheet bodies at least partially overlap and communicate with each other; the installation hole is used for installing a magnetic steel, and the wiring hole is used for passing a temperature measuring device.

[0008] In an exemplary embodiment of this application, each punching sheet body is further provided with an oil hole axially penetrating through the punching sheet body, and the oil holes on adjacent punching sheet bodies communicate with each other. The oil hole and the wiring hole on each rotor punching sheet are spaced apart from each other.

[0009] In an exemplary embodiment of this application, the wiring holes of a plurality of rotor punching sheets are connected into a straight line.

[0010] The second aspect of this application provides a motor, which includes:

[0011] A rotating shaft;

[0012] Temperature measuring device;

[0013] At least one rotor core as described in any one of the above, a central hole penetrating axially along the rotor core is provided on the rotor core, the rotating shaft is inserted into the central hole, and the temperature measuring device is inserted into the wiring hole of the rotor core.

[0014] In another exemplary embodiment of the present application, the temperature measuring device inserted into the rotor core is parallel to the axis of the rotating shaft.

[0015] In another exemplary embodiment of the present application, the temperature measuring device includes a telemetry rotor and a temperature measuring element. The telemetry rotor is sleeved on the rotating shaft and is arranged on one side of the rotor core. A part of the temperature measuring element is inserted into the wiring hole, and one end of the temperature measuring element far from the wiring hole is electrically connected to the telemetry rotor.

[0016] In another exemplary embodiment of the present application, the motor further includes a first end plate. The first end plate is arranged between the rotor core and the telemetry rotor and is connected to both of them;

[0017] A wiring channel extending in the radial direction of the rotating shaft is provided on the first end plate. The wiring channel is provided with a first wire hole and a second wire hole. The first wire hole and the second wire hole are respectively arranged on opposite sides of the first end plate. The first wire hole is arranged on the side of the first end plate close to the rotor core and is communicated with the wiring hole of the rotor core; the second wire hole is arranged on the side of the first end plate close to the telemetry rotor;

[0018] Wherein, the wiring hole, the first wire hole, the wiring channel and the second wire hole are sequentially communicated.

[0019] In another exemplary embodiment of the present application, a plurality of wiring channels are provided in the first end plate, and the plurality of wiring channels are arranged at intervals along the circumferential direction of the first end plate; the temperature measuring device includes a plurality of the temperature measuring elements, and one of the temperature measuring elements is arranged in each of the wiring channels; a plurality of the wiring holes are provided, and the plurality of wiring holes are arranged at intervals along the circumferential direction of the rotor core.

[0020] In another exemplary embodiment of the present application, a measuring point is provided on each of the temperature measuring elements, and each measuring point is arranged in any one of the wiring holes in any one of the rotor cores.

[0021] In another exemplary embodiment of the present application, the telemetry rotor includes a connection position, the measurement point is located at one end of the temperature measurement member, the end of the temperature measurement member away from the measurement point is connected to the connection position, and at least a part of the temperature measurement member between the measurement point and the connection position is placed in the wire routing hole, the first wire hole, the wiring channel, and the second wire hole.

[0022] In another exemplary embodiment of the present application, at least one of the wire routing hole, the first wire hole, the wiring channel, and the second wire hole is filled with a sealing member.

[0023] In another exemplary embodiment of the present application, the motor includes a first rotor core, a second rotor core, and a third rotor core arranged in sequence along the axis direction of the rotating shaft. The first rotor core is connected to the telemetry rotor, the second rotor core is arranged between the first rotor core and the third rotor core, and the mounting holes and the wire routing holes are provided on the first rotor core, the second rotor core, and the third rotor core;

[0024] Among them, at least part of the wire routing holes on the first rotor core, the second rotor core, and the third rotor core overlap and communicate with each other.

[0025] In another exemplary embodiment of the present application, the motor further includes a second end plate, and the second end plate is arranged on the side of the third rotor core away from the telemetry rotor;

[0026] The first end plate, the first rotor core, the second rotor core, the third rotor core, and the second end plate are axially press-fitted on the rotating shaft.

[0027] In another exemplary embodiment of the present application, the motor further includes a telemetry stator, the telemetry stator is coaxially arranged with the telemetry rotor and spaced apart, and the telemetry stator can supply power to the telemetry rotor.

[0028] The third aspect of the present application provides a vehicle, including wheels and the motor according to any one of the above, and the wheels can rotate under the drive of the motor.

[0029] The rotor core, the motor, and the vehicle of the present application at least have the following beneficial effects:

[0030] By inserting the temperature measurement device into the wire routing hole of the rotor core, the temperature inside the rotor core can be displayed in real time. According to the obtained temperature, an accurate rotor core temperature model can be established. Through the established rotor core temperature model, the control accuracy in the motor drive system can be improved, the performance of the motor can be guaranteed, and the reliability and service life of the motor can be improved.

[0031] Other features and advantages of the present application will become apparent from the following detailed description, or will be learned in part through the practice of the present application.

[0032] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0034] Figure 1 Shows a schematic structural diagram of a rotating shaft inserted into a rotor core provided by Embodiment 1, Embodiment 2 or Embodiment 3 of the present application;

[0035] Figure 2 Shows a front view of a rotating shaft inserted into a rotor core provided by Embodiment 1, Embodiment 2 or Embodiment 3 of the present application;

[0036] Figure 3 Shows a right view of a rotating shaft inserted into a rotor core provided by Embodiment 1, Embodiment 2 or Embodiment 3 of the present application;

[0037] Figure 4 Shows Figure 2 A schematic cross-sectional structure diagram along A-A in;

[0038] Figure 5 Shows Figure 2 A schematic cross-sectional structure diagram along B-B in;

[0039] Figure 6 Shows Figure 2 A schematic cross-sectional structure diagram along C-C in;

[0040] Figure 7 Shows Figure 2 A schematic cross-sectional structure diagram along D-D in;

[0041] Figure 8 Shows Figure 2 A schematic cross-sectional structure diagram along E-E in;

[0042] Figure 9 Shows Figure 3 A schematic cross-sectional structure diagram along F-F in;

[0043] Figure 10 Shows Figure 3 A schematic cross-sectional structure diagram along G-G in;

[0044] Figure 11 shows Figure 3 The schematic cross-sectional structure along H-H in

[0045] Description of reference numerals:

[0046] 100, rotor core; 100a, first rotor core; 100b, second rotor core; 100c, third rotor core; 110, rotor punching sheet; 120, mounting hole; 130, wire routing hole; 140, center hole; 150, oil hole; 160, permanent magnet; 170, release hole; 200, rotating shaft; 310, telemetry rotor; 311, connection position; 320, temperature measuring element; 321, measuring point; 400, first end plate; 500, wiring channel; 510, first wire hole; 520, second wire hole; 600, second end plate. Detailed implementation manners

[0047] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art.

[0048] In this application, 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 the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more unless otherwise specifically defined.

[0049] In this application, unless otherwise clearly defined and limited, terms such as "assembly" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In addition, the described features, structures, or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present application. However, those skilled in the art will realize that the technical solutions of the present application can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be employed. In other cases, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the present application.

[0051] Figure 1 The schematic structural diagram shows the shaft inserted into the rotor core provided by the first embodiment, the second embodiment, or the third embodiment of the present application; Figure 2 The front view shows the shaft inserted into the rotor core provided by the first embodiment, the second embodiment, or the third embodiment of the present application; Figure 3 The right view shows the shaft inserted into the rotor core provided by the first embodiment, the second embodiment, or the third embodiment of the present application; Figure 4 Shows Figure 2 The schematic cross-sectional structure along A-A in; Figure 5 Shows Figure 2 The schematic cross-sectional structure along B-B in; Figure 6 Shows Figure 2 The schematic cross-sectional structure along C-C in; Figure 7 Shows Figure 2 The schematic cross-sectional structure along D-D in; Figure 8 Shows Figure 2 The schematic cross-sectional structure along E-E in; Figure 9 Shows Figure 3 The schematic cross-sectional structure along F-F in; Figure 10 Shows Figure 3 The schematic cross-sectional structure along G-G in; Figure 11 Shows Figure 3 The schematic cross-sectional structure along H-H in.

[0052] The first embodiment

[0053] The first embodiment of the present application provides a rotor core 100, which includes at least two rotor punching sheets 110, and at least two rotor punching sheets 110 are stacked and connected to form the rotor core 100, as Figures 5 to 7As shown. This rotor punching sheet 110 includes a punching sheet body, and an installation hole 120 and a wiring hole 130 are provided through the punching sheet body in the axial direction. The wiring hole 130 and the installation hole 120 are arranged at intervals or at least partially overlap with each other. The adjacent punching sheet bodies are staggered in the circumferential direction of the punching sheet body, that is, the punching sheet body can coincide with the adjacent rotor punching sheet 110 after rotating a certain angle along the axis of the punching sheet body. Among them, the designs and shapes of the punching sheet bodies are exactly the same. When the adjacent punching sheet bodies are staggered in the circumferential direction, the wiring holes 130 on the punching sheet bodies at least partially overlap and the wiring holes 130 on the same rotor core 100 are all interconnected.

[0054] It can be understood that these at least two rotor punching sheets 110 adopt an inclined pole structure.

[0055] In addition, the wiring hole 130 can be used to pass through the temperature measuring device described below for measuring the temperature inside the rotor core 100. And through the wiring holes 130 on the punching sheet body at least partially overlap and are interconnected. That is to say, the wiring holes 130 on each rotor punching sheet 110 are interconnected and form a straight line, so that when the temperature measuring device is inserted into the rotor core 100 through the wiring hole 130, it will not be bent, ensuring the temperature measuring accuracy and reliability of the temperature measuring device, and also facilitating the insertion of the temperature measuring device. Through the temperature inside the rotor core 100 measured by this temperature measuring device, an accurate temperature model of the rotor core 100 can be established. Through the established temperature model of the rotor core 100, the control accuracy in the motor drive system described below can be improved, ensuring the performance of the motor in the following text and improving the reliability and service life of the motor.

[0056] It is worth mentioning that as Figure 8 shown, the punching sheet body is a circular ring structure. A central hole 140 and an oil hole 150 are also provided on the punching sheet body. The oil hole 150 is provided through the punching sheet body in the axial direction. The oil holes 150 on the adjacent punching sheet bodies are interconnected, and the oil hole 150 on each punching sheet body is arranged at intervals with the installation hole 120 and the wiring hole 130 to avoid interference between the oil hole 150, the installation hole 120 and the wiring hole 130.

[0057] In addition, as Figures 5 to 7 shown, this rotor punching sheet 110 further includes multiple groups of magnetic steels 160. The multiple groups of magnetic steels 160 are rotationally symmetrically arranged along the axial direction of the punching sheet body. The magnetic steels 160 are embedded in the installation hole 120. The magnetic steels 160 are connected to the punching sheet body through the installation hole 120, with a more stable structure and higher installation accuracy.

[0058] It should be noted that the wiring hole 130 is arranged adjacent to the magnetic steel 160 to facilitate measuring the accurate temperature of the magnetic steel 160 to establish an accurate temperature model.

[0059] In the embodiments of the present application, referring to Figure 5 As shown by the dashed line in Figure 5 , this rotor punching sheet 110 includes eight groups of permanent magnets 160. Each group of permanent magnets 160 adopts a double "V" structure. Using such a double "V" structure for the permanent magnets 160 can improve the utilization rate of the permanent magnets.

[0060] It can be understood that the adjacent mounting holes 120 are spaced from each other through the punching sheet body, that is, a magnetic isolation bridge is formed between the adjacent mounting holes 120 through this punching sheet body to achieve the magnetic isolation effect, thereby avoiding the mutual influence between adjacent permanent magnets 160.

[0061] In the embodiments of the present application, a release hole 170 penetrating axially through the punching sheet body is provided at the end of each mounting hole 120. This release hole 170 communicates with the mounting hole 120. This release hole 170 has a smooth contour line, which can reduce the stress of the permanent magnet 160 in the mounting hole 120 to further ensure the stability of the permanent magnet 160 in the mounting hole 120.

[0062] Embodiment Two

[0063] Embodiment Two of the present application provides a motor. Referring to Figures 1 to 4 As shown, this motor includes a rotating shaft 200, a temperature measuring device, and at least one rotor core 100 described in any one of Embodiment One. A central hole 140 penetrating axially is provided on the rotor core 100, and each central hole 140 on the punching sheet body coincides. This rotating shaft 200 is inserted into the central hole 140; the temperature measuring device can be inserted into the wiring hole 130 of the rotor core 100 and display the temperature inside the rotor core 100. Furthermore, the temperature inside the rotor core 100 can be obtained in real time. According to the obtained temperature, an accurate temperature model of the rotor core 100 can be established. Through the established temperature model of the rotor core 100, the control accuracy in the motor drive system can be improved, the performance of the motor can be ensured, and the reliability and service life of the motor can be improved.

[0064] It is worth mentioning that this motor can be an oil-cooled permanent magnet synchronous motor or a water-cooled permanent magnet synchronous motor, etc., but is not limited thereto.

[0065] In addition, this wiring hole 130 is arranged adjacent to the permanent magnet 160 in the mounting hole 120, and the temperature measuring device is mainly used to measure the temperature of the permanent magnet 160. Because of the loss problem caused by the heating of the permanent magnet 160, after reaching a certain temperature, an irreversible demagnetization problem will occur, which will seriously affect the performance and efficiency of the motor. Therefore, the wiring hole 130 needs to be arranged near the permanent magnet 160 to accurately and real-time detect the temperature of the permanent magnet 160, so as to accurately establish the temperature model of the rotor core 100, improve the control accuracy of the motor drive system, the motor performance and service life, etc.

[0066] In the embodiments of the present application, refer to Figure 4 As shown, the temperature measuring device inserted inside the rotor core 100 is parallel to the axis of the rotating shaft 200, avoiding bending and damage of the temperature measuring device inside the rotor core 100 rotating at high speed, which affects the accuracy and reliability of the temperature detection of the magnet 160.

[0067] Among them, please continue to refer to Figure 4 As shown, this temperature measuring device includes a telemetry rotor 310 and a temperature measuring element 320. Refer to Figure 1 and Figure 2 As shown, the telemetry rotor 310 is sleeved on the rotating shaft 200, and the telemetry rotor 310 is arranged on one side of the rotor core 100; refer to Figure 4 As shown by the dashed line in

[0068] A part of the temperature measuring element 320 is inserted into the wire routing hole 130, and one end of the temperature measuring element 320 far from the wire routing hole 130 is electrically connected to the telemetry rotor 310, so as to be able to feedback the temperature inside the rotor core 100 obtained in real time to the telemetry rotor 310.

[0069] It can be understood that setting the temperature measuring element 320 inside the rotor core 100 can make the overall structure more compact.

[0070] Among them, this motor includes at least one rotor core 100, such as one, two, three, four or five rotor cores 100, etc.

[0071] For example, refer to Figure 4 As shown, this motor includes a first rotor core 100a, a second rotor core 100b and a third rotor core 100c arranged in sequence along the axis direction of the rotating shaft 200. The first rotor core 100a is connected to the third rotor core 100c through the second rotor core 100b, that is, the second rotor core 100b is arranged between the first rotor core 100a and the third rotor core 100c, and the first rotor core 100a is arranged on the side of the second rotor core 100b close to the telemetry rotor 310. Among them, refer to Figure 5 、 Figure 6 and Figure 7As shown, the first rotor core 100 a , the second rotor core 100 b and the third rotor core 100 c adopt an oblique pole structure, that is, the three are staggered in the circumferential direction of the rotating shaft 200 .

[0072] For example, the first rotor core 100a can be rotated by a certain angle in the circumferential direction to overlap with the second rotor core 100b or the third rotor core 100c.

[0073] The first rotor core 100a, the second rotor core 100b and the third rotor core 100c are all provided with mounting holes 120, that is, the first rotor core 100a, the second rotor core 100b and the third rotor core 100c are all provided with magnets 160, and the magnets 160 on the first rotor core 100a, the magnets 160 on the second rotor core 100b and the magnets 160 on the third rotor core 100c are arranged alternately.

[0074] In the examples of this application, see Figure 4 As shown, the wiring holes 130 on the first rotor core 100a, the second rotor core 100b and the third rotor core 100c at least partially overlap and are connected, the wiring holes 130 of the first rotor core 100a, the wiring holes 130 of the second rotor core 100b and the wiring holes 130 of the third rotor core 100c are connected, and the wiring holes 130 of the first rotor core 100a, the wiring holes 130 of the second rotor core 100b and the wiring holes 130 of the third rotor core 100c are located on the same straight line and are parallel to the axial direction of the rotating shaft 200; the wiring holes 130 of the three rotor cores 100 are located on the same straight line, ensuring that the temperature measuring component 320 will not bend when inserted into the rotor core 100, thereby preventing the temperature measuring component 320 from being bent and damaged in the high-speed rotating rotor core 100, thereby affecting the accuracy and reliability of temperature detection of the magnetic steel 160. Furthermore, by arranging them in a straight line, it is also convenient for inserting the temperature measuring component 320 .

[0075] It should be noted that the rotor core 100 is provided with a plurality of wiring holes 130, and the plurality of wiring holes 130 are arranged at intervals in the circumferential direction of the rotor core 100, so as to obtain the temperature of the magnetic steel 160 at different positions, and ensure the accuracy and precision of the test. That is, each rotor core 100 is provided with a plurality of wiring holes 130 in the circumferential direction, and a plurality of temperature measuring components 320 can be inserted into the wiring holes 130, so as to detect the temperature inside the rotor core 100, and provide real-time feedback on the temperature of the magnetic steel 160, thereby improving the accuracy and precision of the temperature detection of the magnetic steel 160.

[0076] For example, twelve groups of wiring holes 130 are provided on the rotor core 100 , and the twelve groups of wiring holes 130 are spaced apart in the circumferential direction of the rotor core 100 , so as to measure the temperature of the magnetic steel 160 at twelve locations, thereby ensuring the accuracy and precision of the test.

[0077] In the embodiment of the present application, refer to Figure 4 As shown, at one end of the temperature measuring element 320 away from the telemetry rotor 310, there is a measuring point 321. This measuring point 321 sequentially passes through the wire holes of the first rotor core 100a and the second rotor core 100b and is arranged in the wire hole 130 of the third rotor core 100c. By arranging the measuring point 321 in the wire hole 130 of this third rotor core 100c, the temperature of the magnetic steel 160 adjacent to this wire hole 130 can be detected.

[0078] In other embodiments, the measuring point 321 can also pass through the wire hole of the first rotor core 100a and be arranged in the wire hole 130 of the second rotor core 100b to detect the temperature of the magnetic steel adjacent to this measuring point 321 in the second rotor core 100b; the measuring point 321 can also be arranged in the wire hole of the first rotor core 100a without passing through the second rotor core 100b and the third rotor core 100c to detect the temperature of the magnetic steel adjacent to this measuring point 321 in the first rotor core 100a. Such a setting can shorten the length of the temperature measuring element 320, reduce weight and cost.

[0079] That is to say, this temperature measuring element 320 can not only detect the temperature of the magnetic steel 160 in the third rotor core 100c, but also detect the temperature of the magnetic steel 160 in the second rotor core 100b and / or the first rotor core 100a.

[0080] It can be understood that the temperature measuring device includes a plurality of temperature measuring elements 320, and each temperature measuring element 320 is provided with a measuring point 321. Each measuring point 321 can be arranged in any one of the wire holes of the first rotor core 100a, the second rotor core 100b, and the third rotor core 100c. For example, the measuring point 321 on the temperature measuring element 320 can be set at any one of the wire holes 130 on the second rotor core 100b, or can also be set at any one of the wire holes 130 on the first rotor core 100a, and can be specifically designed according to different implementation manners. That is to say, the measuring point 321 of this temperature measuring element 320 can be flexibly arranged, improving the applicability and versatility of the magnetic steel 160 temperature detection device.

[0081] It is worth mentioning that by providing the wire holes 130 on the first rotor core 100a, the second rotor core 100b, and the third rotor core 100c, the temperature rise characteristics of the rotor core 100 will not be affected, because the temperature rise of the rotor core 100 is mainly caused by the electromagnetic eddy current loss during high speed operation, resulting in heat generation. Evaluating from the electromagnetic perspective, the influence of this wire hole 130 on the rotor core 100 is not significant, so the influence on the temperature rise is negligible.

[0082] In the embodiment of the present application, the part of the temperature measuring element 320 inserted into the wire routing hole 130 is parallel to the axis direction of the rotating shaft 200, so as to prevent the temperature measuring element 320 inserted into the wire routing hole 130 from being bent. The straight-line temperature measuring element 320 can shorten the usage length of the temperature measuring element 320 and reduce costs. Moreover, using the straight-line temperature measuring element 320 can also reduce the space occupied by the rotor core 100 and reduce the impact on the performance of the rotor core 100.

[0083] In order to measure the temperature of the permanent magnet 160 more accurately, the temperature measuring element 320 can adopt a copper and constantan thermocouple wire with a diameter of 0.2 to 1 mm and painted with varnish. Its measurement accuracy can reach 0.1 °C, and the temperature range can reach -40 °C to 350 °C. In addition, the temperature measuring element 320 can also be any temperature measuring element 320 that has been used or will be developed in this field.

[0084] In addition, as shown in Figure 8 and Figure 9 the motor further includes a first end plate 400. The first end plate 400 is disposed between the first rotor core 100a and the telemetry rotor 310. The first end plate 400 is attached to and connected with the first rotor core 100a. The telemetry rotor 310 is fixedly connected to the first end plate 400 through a fixing member. For example, the telemetry rotor 310 can be fixed to the first end plate 400 by bolts, which has the characteristics of being reusable and detachable.

[0085] It can be understood that this first end plate 400 can protect the first rotor core 100a and prevent the permanent magnet 160 on the first rotor core 100a from falling off.

[0086] Among them, as shown in Figure 4 and Figure 8 the first end plate 400 is provided with a plurality of wiring channels 500 extending in the radial direction of the rotating shaft 200. The plurality of wiring channels 500 are arranged at intervals. Each wiring channel 500 is provided with a temperature measuring element 320. Each wiring channel 500 is provided with a first wire hole 510 and a second wire hole 520. The first wire hole 510 and the second wire hole 520 are respectively disposed on opposite sides of the first end plate 400. The first wire hole 510 is disposed on the side of the first end plate 400 close to the first rotor core 100a and is communicated with the wire routing hole 130 of the first rotor core 100a; the second wire hole 520 is disposed on the side of the first end plate 400 close to the telemetry rotor 310; among them, the wire routing hole 130, the first wire hole 510, the wiring channel 500 and the second wire hole 520 are sequentially communicated, so that the temperature measuring element 320 can be smoothly inserted into the wire routing hole 130, and the temperature measuring element 320 is led out through the wiring channel 500 to the telemetry rotor 310 and electrically connected to the telemetry rotor 310, so as to be able to obtain the temperature inside the rotor core 100 in real time.

[0087] Among them, the first wire hole 510 communicates with the outlet of the wire routing hole 130 on the first rotor core 100a, and the second wire hole 520 corresponds to the telemetry rotor 310; that is to say, the part of the temperature measuring element 320 that is not inserted into the wire routing hole 130 is led out through the outlet of the wire routing hole 130 and then enters the wiring channel 500 through the first wire hole 510.

[0088] It should be noted that, as shown in Figure 4 , the first wire hole 510 and the second wire hole 520 are arranged in sequence in the radial direction of the first end plate 400, and the distance between the first wire hole 510 and the second wire hole 520 in the radial direction of the rotating shaft 200 is less than the radius of the first end plate 400, so that the temperature measuring element 320 measures the temperature of the magnet 160 inside the rotor core 100.

[0089] It is worth mentioning that, as shown in Figure 4 , a connection position 311 is provided on the telemetry rotor 310. The connection position 311 is arranged on the side of the telemetry rotor 310 close to the first end plate 400 and communicates with the second wire hole 520. When the temperature measuring element 320 is led out through the wiring channel 500 and the second wire hole 520, the temperature measuring element 320 is connected to the connection position 311.

[0090] In the embodiment of the present application, the measuring point 321 is located at one end of the temperature measuring element 320. The end of the temperature measuring element 320 far from the measuring point 321 is connected to the connection position 311. At least a part of the temperature measuring element 320 between the measuring point 321 and the connection position 311 is placed in the wire routing hole 130, the first wire hole 510, the wiring channel 500 and the second wire hole 520. When the temperature measuring element 320 measures the temperature of the magnet 160 inside the third rotor core 100c, the measuring point 321 of the temperature measuring element 320 is sequentially inserted into the wire routing hole 130 of the first rotor core 100a, the wire routing hole 130 of the second rotor core 100b and arranged in the wire routing hole 130 of the third rotor core 100c. A part of the temperature measuring element 320 outside the wire routing hole 130 is inserted into the first wire hole 510, the wiring channel 500 and the second wire hole 520, and the other part is located between the telemetry rotor 310 and the first end plate 400. The end of the temperature measuring element 320 far from the measuring point 321 is connected to the connection position 311.

[0091] That is: as shown in Figure 4 , the temperature measuring element 320 is wired along the wire routing holes 130 of the third rotor core 100c, the wire routing holes 130 of the second rotor core 100b, the wire routing holes 130 of the first rotor core 100a, the first wire hole 510, the wiring channel 500 and the second wire hole 520.

[0092] In addition, for the oil-cooled permanent magnet synchronous motor, the wiring hole 130 is opened on the rotor core 100, and the wiring hole 130 and the oil hole 150 are spaced apart from each other, so that the oil path and the wiring path do not interfere with each other, so that the wiring path will not affect the oil path on the rotating shaft 200, thereby avoiding mutual interference between the wiring path and the oil path, and improving the reliability of the temperature detection device of the magnetic steel 160.

[0093] In the embodiment of the present application, the wiring structure of the overall temperature measuring component 320 is in a "Z" shape. By designing the temperature measuring component 320 so that the oil holes 150 and the wiring holes 130 are spaced apart from each other, the wiring holes 130 on the three rotor cores 100 are located on the same straight line, and the oil holes 150 and the wiring holes 130 are spaced apart from each other. The oil path of the oil hole 150 and the wiring path of the temperature measuring component 320 are separated from each other and do not interfere with each other, so that the opening of the wiring holes 130 will not affect the oil path in the motor.

[0094] It is worth mentioning that when the motor is an oil-cooled motor, the shaft 200 of the oil-cooled motor is hollow, and the inner wall of the shaft 200 is provided with a hole connected to the oil passage connected to the oil hole 150 in the rotor core 100. The interior of the shaft 200, the shaft hole, the oil passage of the rotor core 100 and the oil hole 150 together constitute the oil passage of the oil-cooled motor. The present application staggers the wiring passage 500 and the oil hole 150, and at the same time, sets the first wire hole 510, the wiring passage 500 and the second wire hole 520 on the first end plate 400, so that the temperature measuring member 320 can avoid the oil passages in the shaft 200 and the rotor core 100 at the same time.

[0095] In addition, a circuit board is provided on the telemetry rotor 310 , which can collect, amplify and filter the temperature signal obtained by the temperature measuring component 320 , and feed it back to the terminal in real time, so as to obtain the temperature of the magnetic steel 160 in real time.

[0096] The temperature measuring component 320 is welded to the telemetering rotor 310, and the temperature measuring component 320 is welded to the circuit board on the telemetering rotor 310 to promote the tightness of the connection between the temperature measuring component 320 and the telemetering rotor 310, which can effectively feed back the temperature of the magnet 160 to the telemetering rotor 310, and then feed back to the terminal to obtain the temperature inside the magnet 160 in real time.

[0097] That is, the connection position 311 mentioned above can be a welding point on the circuit board, and the temperature measuring element 320 is connected to the welding point by welding, so that the temperature signal measured by the temperature measuring element 320 can be transmitted to the telemetry rotor 310 .

[0098] To ensure the stability of the temperature measuring element 320 in the wire passing hole 130 and the wiring channel 500 during high-speed operation, a sealant is filled in at least one of the wire passing hole 130, the first wire hole 510, the wiring channel 500, and the second wire hole 520, so that the temperature measuring element 320 is fixedly connected to at least one of the first rotor core 100a, the second rotor core 100b, the third rotor core 100c, and the first end plate 400, and is not easily slipped out of the wire passing hole 130 and the wiring channel 500, thereby improving the structural reliability of the temperature measuring element 320 under high-speed rotation conditions.

[0099] Among them, this sealant includes epoxy resin. When filling the sealant into the wire passing hole 130 and the wiring channel 500, the sealant is melted, and then the melted sealant is filled into the wire passing hole 130 and the wiring channel 500, and the sealant in the wire passing hole 130 and the wiring channel 500 is solidified.

[0100] It is worth mentioning that this motor includes a telemetry system. This telemetry system includes a telemetry stator and the above-mentioned telemetry rotor 310. The telemetry stator and the telemetry rotor 310 are parallel to each other and arranged at intervals, coaxially arranged between the telemetry stator and the telemetry rotor 310, and the telemetry rotor 310 can rotate in its circumferential direction; the telemetry stator and the telemetry rotor 310 are used in cooperation, that is, the telemetry stator supplies inductive power to the telemetry rotor 310.

[0101] It can be understood that the basic principle of supplying inductive power to the telemetry rotor 310 by the telemetry stator is that the induction power supply converts the DC power supply into high-frequency alternating current (the frequency is adjustable from 20KHz to 200KHz); the alternating current generates an alternating electromagnetic field in the stator coil of the telemetry stator, and the rotor coil of the telemetry rotor 310 induces the alternating magnetic field to generate alternating current, and finally rectifies and stabilizes the voltage to supply power to the telemetry rotor 310.

[0102] In the embodiment of the present application, referring to Figure 10 and Figure 11 as shown, this motor further includes a second end plate 600. This second end plate 600 is arranged on the side of the third rotor core 100c away from the telemetry rotor 310, and is attached to the third rotor core 100c to protect the magnetic steel 160 in the third rotor core 100c and prevent the magnetic steel 160 in the third rotor core 100c from falling off.

[0103] Among them, the first end plate 400, the first rotor core 100a, the second rotor core 100b, the third rotor core 100c, and the second end plate 600 are axially press-fitted on the rotating shaft 200 to ensure the tightness of the connection between them.

[0104] Embodiment Three

[0105] Embodiment 3 of the present application provides a vehicle, which includes wheels and the motor described in any one of Embodiment 2, and the wheels can rotate under the drive of the motor.

[0106] In the description of this specification, the description with reference to terms such as "some embodiments" and "exemplarily" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0107] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and the description of the present application shall fall within the scope covered by the patent of the present application.

Claims

1. A rotor core, characterized in that, The rotor core includes: A plurality of rotor punching sheets, each of the rotor punching sheets including a punching sheet body, and an installation hole and a wiring hole axially penetrating through the punching sheet body. The installation hole and the wiring hole are arranged at intervals or at least partially coincide; adjacent punching sheet bodies are staggered in the circumferential direction, and the wiring holes on adjacent punching sheet bodies at least partially coincide and communicate with each other; the installation hole is used for installing a permanent magnet, and the wiring hole is used for passing a temperature measuring device.

2. The rotor core according to claim 1, wherein, Each punching sheet body is further provided with an oil hole axially penetrating through the punching sheet body, and the oil holes on adjacent punching sheet bodies communicate with each other. The oil hole and the wiring hole on each rotor punching sheet are arranged at intervals from each other.

3. The rotor core according to claim 1 or 2, characterized in that, The wiring holes of the plurality of rotor punching sheets are connected into a straight line.

4. A motor, characterized in that, The motor includes: A rotating shaft; A temperature measuring device; At least one rotor core according to any one of claims 1 to 3, the rotor core being provided with a central hole axially penetrating through it, the rotating shaft being inserted into the central hole, and the temperature measuring device being inserted into the wiring hole of the rotor core.

5. The motor according to claim 4, characterized in that, The temperature measuring device inserted into the rotor core is parallel to the axis of the rotating shaft.

6. The electric machine according to claim 4 or 5, characterized in that, The temperature measuring device includes a telemetry rotor and a temperature measuring element. The telemetry rotor is sleeved on the rotating shaft and is arranged on one side of the rotor core. A part of the temperature measuring element is inserted into the wiring hole, and one end of the temperature measuring element away from the wiring hole is electrically connected to the telemetry rotor.

7. The motor according to claim 6, characterized in that, The motor further includes a first end plate, the first end plate being arranged between the rotor core and the telemetry rotor and being connected to both of them; The first end plate is provided with a wiring channel extending in the radial direction of the rotating shaft. The wiring channel is provided with a first wire hole and a second wire hole. The first wire hole and the second wire hole are respectively arranged on opposite sides of the first end plate. The first wire hole is arranged on the side of the first end plate close to the rotor core and communicates with the wiring hole of the rotor core; the second wire hole is arranged on the side of the first end plate close to the telemetry rotor; Wherein, the wiring hole, the first wire hole, the wiring channel and the second wire hole are sequentially communicated.

8. The motor according to claim 7, characterized in that, A plurality of wiring channels are arranged in the first end plate, and the plurality of wiring channels are arranged at intervals in the circumferential direction of the first end plate; the temperature measuring device includes a plurality of the temperature measuring elements, and one of the temperature measuring elements is arranged in each wiring channel; there are a plurality of the wiring holes, and the plurality of wiring holes are arranged at intervals in the circumferential direction of the rotor core.

9. The motor according to claim 8, characterized in that, Each temperature measuring element is provided with a measuring point, and each measuring point is arranged in any one of the wiring holes in any one of the rotor cores.

10. The motor according to claim 9, characterized in that, The telemetry rotor includes a connection position. The measuring point is located at one end of the temperature measuring element. One end of the temperature measuring element away from the measuring point is connected to the connection position. At least a part of the temperature measuring element between the measuring point and the connection position is placed in the wiring hole, the first wire hole, the wiring channel and the second wire hole.

11. The motor according to claim 10, characterized in that, At least one of the wiring hole, the first wire hole, the wiring channel and the second wire hole is filled with a sealing member.

12. The motor according to claim 7, wherein, The motor includes a first rotor core, a second rotor core, and a third rotor core that are sequentially arranged along the axial direction of the rotating shaft. The first rotor core is connected to the telemetry rotor. The second rotor core is disposed between the first rotor core and the third rotor core. The mounting holes and the wire routing holes are provided on the first rotor core, the second rotor core, and the third rotor core; Wherein, the wire routing holes on the first rotor core, the second rotor core, and the third rotor core at least partially overlap and communicate with each other.

13. The motor according to claim 12, characterized in that, The motor further includes a second end plate, and the second end plate is disposed on a side of the third rotor core away from the telemetry rotor; The first end plate, the first rotor core, the second rotor core, the third rotor core, and the second end plate are axially press-fitted onto the rotating shaft.

14. The motor according to claim 13, characterized in that, The motor further includes a telemetry stator, and the telemetry stator is coaxially and spaced apart from the telemetry rotor, and the telemetry stator can supply power to the telemetry rotor.

15. A vehicle, characterized in that, It includes a wheel and the motor according to any one of claims 5 to 14, and the wheel can rotate under the drive of the motor.

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