Rotor assembly of motor and motor

Abstract

The utility model discloses a rotor assembly of a motor and the motor. The rotor assembly comprises a rotating shaft; the rotor core is arranged on the rotating shaft in a sleeving manner, a magnetic steel mounting groove which is axially arranged in a penetrating manner is formed in the rotor core, a wire harness mounting groove which is sunken towards the inside is further formed in the surface, in the axial direction, of the rotor core, and the wire harness mounting groove is communicated with the magnetic steel mounting groove; at least part of the detection device is contained in the wire harness installation groove, the detection device is provided with a detection end, and the detection end is arranged in the magnetic steel installation groove to detect the temperature of the magnetic steel. According to the rotor assembly of the motor provided by the embodiment of the invention, the rotor assembly can detect the temperature of the magnetic steel.

Description

Technical Field

[0001] The present application relates to the field of electric motors, and in particular to a rotor assembly of an electric motor and an electric motor. Background Art

[0002] In the related art, the temperature of the motor's stator and rotor will change with the change of the motor's operating conditions. In particular, when the motor cooling fails, the temperature of the motor's stator and rotor will soar rapidly, causing damage to internal parts. In this regard, automotive drive motors or generators will add a temperature detection function module to the stator assembly, but the existing rotor assemblies do not have a temperature detection module. If the temperature of the magnetic steel on the rotor assembly exceeds the temperature resistance limit of the magnetic steel, demagnetization will occur, affecting the motor performance. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a rotor assembly of a motor, which can detect the temperature of a magnetic steel.

[0004] The present application also proposes a motor having the above rotor assembly.

[0005] According to the embodiment of the present application, the rotor assembly of the motor includes: a rotating shaft; a rotor core, the rotor core is sleeved on the rotating shaft, a magnetic steel installation groove is formed on the rotor core and is arranged to penetrate in the axial direction, and a wire harness installation groove is also formed on the surface of the rotor core along the axial direction and is recessed inward, and the wire harness installation groove is connected to the magnetic steel installation groove; a detection device, at least a part of the detection device is accommodated in the wire harness installation groove, and the detection device has a detection end, and the detection end is arranged in the magnetic steel installation groove to detect the temperature of the magnetic steel.

[0006] According to the rotor assembly of the motor in the embodiment of the present application, the rotor assembly has a rotor core and a detection device. The rotor core is formed with a magnet mounting groove which is arranged through the axis and is used to accommodate the magnet, and a wire harness mounting groove which is arranged in a recessed manner on the surface in the axial direction. At least a part of the detection device can be accommodated in the wire harness mounting groove. Furthermore, a detection end is formed on the detection device. The detection end can be arranged in the magnet mounting groove and detect the temperature of the magnet, so as to evaluate whether the magnet has the risk of over-temperature demagnetization, thereby improving the reliability of the rotor assembly.

[0007] In some embodiments of the present application, the rotor assembly also includes: a magnet, which is disposed in the magnet mounting groove and is spaced apart from at least a portion of the inner wall of the magnet mounting groove to form a accommodating cavity, and the detection end is received in the accommodating cavity and is in contact with the magnet to detect the temperature of the magnet.

[0008] In some embodiments of the present application, the wiring harness installation groove includes: a first groove body, which extends in the radial direction of the rotating shaft and is recessed toward the rotor core; a second groove body, which is recessed toward the rotor core, one end of the second groove body is connected to the first groove body, and the other end of the second groove body is connected to the magnetic steel installation groove.

[0009] In some embodiments of the present application, the magnetic steel installation groove is configured in plurality and is arranged around the circumference of the rotating shaft, the second groove body is configured in plurality, and the plurality of second groove bodies are respectively connected one by one with the plurality of magnetic steel installation grooves.

[0010] In some embodiments of the present application, a receiving groove extending in the axial direction is formed in the rotating shaft, and at least another part of the detection device is received in the receiving groove.

[0011] In some embodiments of the present application, an inner wall of the accommodating groove is formed with a mounting hole penetrating along the radial direction, and the mounting hole and the wiring harness mounting groove are arranged opposite to each other in the radial direction.

[0012] In some embodiments of the present application, the detection device includes: a first wiring harness, the first wiring harness is accommodated in the accommodating groove; a second wiring harness, the second wiring harness is accommodated in the wiring harness mounting groove, one end of the second wiring harness is connected to the first wiring harness through the mounting hole, and the other end of the second wiring harness is formed with a detection end.

[0013] In some embodiments of the present application, a weight-reducing hole is formed on the rotor core and is arranged to penetrate along the axial direction. The weight-reducing hole is configured in plurality and the plurality of weight-reducing holes are arranged at intervals in the circumferential direction of the rotating shaft.

[0014] In some embodiments of the present application, the rotor assembly further includes: a rotor pressure plate, which is sleeved on the rotating shaft and cooperates with the rotor core to press the rotor core.

[0015] The following is a brief description of the motor according to an embodiment of the present application.

[0016] The motor according to the embodiment of the present application is provided with the rotor assembly of the above embodiment. Since the motor according to the embodiment of the present application is provided with the rotor assembly of the above embodiment, the motor can detect the temperature of the magnetic steel, so as to evaluate whether the magnetic steel has the risk of over-temperature demagnetization, thereby avoiding problems such as motor performance degradation, torque power failure to meet standards, increased fuel consumption, NVH deterioration, etc. caused by magnetic steel demagnetization, thereby improving the reliability of the motor.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic structural diagram of a rotor assembly according to an embodiment of the present application;

[0020] Figure 2 yes Figure 1 A partial structural diagram of the middle rotor assembly;

[0021] Figure 3 yes Figure 1 Schematic diagram of the assembly of the rotor core and magnetic steel;

[0022] Figure 4 yes Figure 1 Schematic diagram of the structure of the transfer shaft;

[0023] Figure 5 yes Figure 1 A schematic cross-sectional view of the middle rotor assembly;

[0024] Figure 6 yes Figure 1 Assembly diagram of the middle rotor core, magnetic steel and detection device.

[0025] Reference numerals:

[0026] 10. Rotor assembly; 11. Rotating shaft; 111. Receiving slot; 112. Mounting hole; 12. Rotor core; 121. Magnet mounting slot; 1211. Receiving cavity; 122. Wiring harness mounting slot; 1221. First slot body; 1222. Second slot body; 123. Weight reduction hole; 13. Detection device; 131. First wiring harness; 132. Second wiring harness; 133. Detection end; 14. Magnet; 15. Rotor pressure plate. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0028] Reference below Figure 1-Figure 6A rotor assembly 10 of a motor according to an embodiment of the present application is described. The rotor assembly 10 includes a rotating shaft 11, a rotor core 12 and a detection device 13. The rotor core 12 is sleeved on the rotating shaft 11. A magnetic steel mounting groove 121 is formed on the rotor core 12 and is arranged to penetrate the rotor core 12 in the axial direction. A wire harness mounting groove 122 which is recessed inward is also formed on the axial surface of the rotor core 12. The wire harness mounting groove 122 is connected to the magnetic steel mounting groove 121. At least a portion of the detection device 13 is accommodated in the wire harness mounting groove 122, and the detection device 13 has a detection end 133. The detection end 133 is arranged in the magnetic steel mounting groove 121 to detect the temperature of the magnetic steel 14.

[0029] At present, the temperature of the motor's stator and rotor will change with the change of the motor's operating conditions. In particular, when the motor cooling fails, the temperature of the motor's stator and rotor will soar rapidly, causing damage to internal parts. In this regard, automotive drive motors or generators will add a temperature detection function module to the stator assembly, but the existing rotor assemblies do not have a temperature detection module. If the temperature of the magnetic steel on the rotor assembly exceeds the temperature resistance limit of the magnetic steel, demagnetization will occur, affecting the motor performance.

[0030] like Figure 1 As shown, specifically, the rotor assembly 10 includes an axially extending rotating shaft 11, and a rotor core 12 is sleeved on the outer peripheral wall of the rotating shaft 11. The rotor core 12 can be constructed in multiple pieces, and two adjacent rotor cores 12 can be arranged in close proximity, wherein the rotor core 12 and the rotating shaft 11 can rotate synchronously, and a magnetic steel mounting groove 121 is formed on the rotor core 12 and is arranged axially through the rotor core 12. The magnetic steel mounting groove 121 can be used to install the magnetic steel 14, thereby ensuring that the magnetic steel 14 can be arranged inside the rotor core 12.

[0031] Furthermore, a wiring harness installation groove 122 is formed on the axial surface of the rotor core 12, and the wiring harness installation groove 122 can be set to be recessed toward the inside of the rotor core 12, wherein the wiring harness installation groove 122 can be connected to the magnetic steel installation groove 121, and at least a portion of the detection device 13 can be accommodated in the wiring harness installation groove 122, thereby preventing the detection device 13 from affecting the arrangement position of the two adjacent rotor cores 12, so that the two adjacent rotor cores 12 can fit each other. In a specific embodiment of the present application, the detection device 13 can be fixed in the wiring harness installation groove 122 by means of a heat-resistant tape or epoxy resin adhesive, thereby preventing the detection device 13 from falling off when the rotor assembly 10 rotates at high speed, thereby ensuring the reliability of the detection device 13.

[0032] A detection end 133 is formed at one end of the detection device 13. The detection end 133 can be set in the magnet installation groove 121 and detect the temperature of the magnet 14. By detecting the temperature of the magnet 14, the temperature of the magnet 14 under all extreme operating conditions of the motor can be obtained, so as to evaluate whether the magnet 14 has the risk of over-temperature demagnetization, thereby improving the reliability of the rotor assembly 10.

[0033] In short, the rotor assembly 10 of the present application has a rotor core 12 and a detection device 13. The rotor core 12 is formed with a magnet mounting groove 121 which is arranged through the axis and is used to accommodate the magnet 14, and a harness mounting groove 122 which is recessed in the axial surface. At least a portion of the detection device 13 can be accommodated in the harness mounting groove 122. Furthermore, a detection end 133 is formed on the detection device 13. The detection end 133 can be arranged in the magnet mounting groove 121 and detect the temperature of the magnet 14, so as to evaluate whether the magnet 14 has the risk of over-temperature demagnetization, thereby improving the reliability of the rotor assembly 10.

[0034] like Figure 2 As shown, in some embodiments of the present application, the rotor assembly 10 also includes a magnet 14, which can be arranged in the magnet installation slot 121, and the magnet 14 is spaced apart from at least part of the inner wall of the magnet installation slot 121, thereby forming a receiving cavity 1211, and the detection end 133 can be accommodated in the receiving cavity 1211, and the detection end 133 can be attached to the magnet 14 to detect the temperature of the magnet 14. In a specific embodiment, both sides of the magnet 14 in the width direction can be attached to the inner wall of the magnet installation slot 121, and both sides of the magnet 14 in the length direction are spaced apart from the magnet installation slot 121 to form a plurality of receiving cavities 1211, and the detection end 133 can be arranged in one or more receiving cavities 1211 to detect the temperature of the magnet 14. Figure 1 As shown, in some embodiments of the present application, the rotor assembly 10 further includes a rotor pressure plate 15 , which can be sleeved on the rotating shaft 11 , and the rotor pressure plate 15 can cooperate with the plurality of rotor cores 12 to compress the rotor cores 12 .

[0035] like Figure 3As shown, in some embodiments of the present application, the wiring harness installation groove 122 includes a first groove body 1221 and a second groove body 1222, the first groove body 1221 extends in the radial direction of the rotating shaft 11 and is recessed toward the inside of the rotor core 12, the second groove body 1222 can be recessed toward the rotor core 12, and one end of the second groove body 1222 can be connected to the first groove body 1221, and the other end of the second groove body 1222 can be connected to the magnetic steel installation groove 121. By setting the first groove body 1221 and the second groove body 1222, To facilitate the installation and arrangement of the detection device 13, in a specific embodiment, the magnetic steel mounting groove 121 is constructed in plurality, and the plurality of magnetic steel mounting grooves 121 can be arranged around the circumference of the rotating shaft 11, the second groove body 1222 can be constructed in plurality, and the plurality of second groove bodies 1222 can be arranged in connection with the plurality of magnetic steel mounting grooves 121 one by one, and by setting the plurality of magnetic steel mounting grooves 121 and the plurality of second groove bodies 1222, the temperatures of the plurality of magnetic steels 14 in the rotor assembly 10 can be detected, thereby improving the accuracy of the temperature detection of the magnetic steels 14.

[0036] like Figure 4 and Figure 5 As shown, in some embodiments of the present application, an axially extending receiving groove 111 is formed in the rotating shaft 11, and another at least part of the detection device 13 is received in the receiving groove 111. By arranging another at least part of the detection device 13 in the receiving groove 111, the detection device 13 can be prevented from affecting the rotation of the rotating shaft 11. In a specific embodiment of the present application, the detection device 13 can be fixed in the receiving groove 111 by bonding with a heat-resistant tape or epoxy resin glue, thereby preventing the detection device 13 from falling off when the rotating shaft 11 rotates at a high speed, thereby ensuring the reliability of the detection device 13.

[0037] like Figure 4 and Figure 5 As shown, in some embodiments of the present application, an inner wall of the accommodating groove 111 is formed with a mounting hole 112, and the mounting hole 112 can be arranged to penetrate the rotating shaft 11 in the radial direction, wherein the mounting hole 112 and the wiring harness mounting groove 122 are arranged radially opposite to each other, thereby ensuring that the detection device 13 can pass through the mounting hole 112 and be assembled with the wiring harness mounting groove 122 during installation. In other embodiments of the present application, the rotor core 12 can be constructed in plurality, each of which is formed with a wiring harness mounting groove 122, and the mounting holes 112 can be constructed in plurality and spaced apart in the axial direction, and the plurality of mounting holes 112 can be arranged in a one-to-one correspondence with the plurality of wiring harness mounting grooves 122.

[0038] In other embodiments of the present application, the wiring harness installation groove 122 can be constructed in plurality, and the plurality of wiring harness installation grooves 122 can be arranged at intervals in the circumferential direction of the rotor core 12; the mounting hole 112 can be constructed in plurality, and the plurality of mounting holes 112 can be arranged at intervals in the circumferential direction on the inner wall of the mounting groove, wherein the plurality of mounting holes 112 can be arranged in a one-to-one correspondence with the plurality of wiring harness installation grooves 122.

[0039] like Figure 5 and Figure 6 As shown, in some embodiments of the present application, the detection device 13 includes a first wire harness 131 and a second wire harness 132, the first wire harness 131 is accommodated in the accommodating groove 111, one end of the first wire harness 131 extends out of the accommodating groove 111 and is connected to an external signal acquisition device, the second wire harness 132 is accommodated in the wire harness mounting groove 122, one end of the second wire harness 132 is connected to the other end of the first wire harness 131 through the mounting hole 112, and the other end of the second wire harness 132 is formed with a detection end 133 suitable for detecting the temperature of the magnetic steel 14.

[0040] like Figure 3 and Figure 6 As shown, in some embodiments of the present application, a weight-reducing hole 123 is formed on the rotor core 12. The weight-reducing hole 123 can be axially penetrated in the rotor core 12. The weight-reducing hole 123 can reduce the overall weight of the rotor core 12 and improve the rotation efficiency of the rotor core 12. Furthermore, the weight-reducing hole 123 can be constructed in plurality, and the plurality of weight-reducing holes 123 can be spaced apart in the circumferential direction of the rotating shaft 11.

[0041] The following is a brief description of the motor according to an embodiment of the present application.

[0042] According to the embodiment of the present application, the motor is provided with the rotor assembly 10 of the above embodiment. Since the motor of the embodiment of the present application is provided with the rotor assembly 10 of the above embodiment, the motor can detect the temperature of the magnetic steel 14, so as to evaluate whether the magnetic steel 14 has the risk of over-temperature demagnetization, thereby avoiding the problems such as motor performance degradation, torque power failure, increased fuel consumption, NVH deterioration, etc. caused by demagnetization of the magnetic steel 14, thereby improving the reliability of the motor.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0045] In the description of the present application, “plurality” means two or more.

[0046] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0047] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0049] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotor assembly of a motor, characterized in that: include: Rotating shaft; A rotor core, wherein the rotor core is sleeved on the rotating shaft, a magnetic steel installation groove is formed on the rotor core and is arranged to penetrate in the axial direction, and a wire harness installation groove is also formed on the surface of the rotor core along the axial direction and is recessed inward, and the wire harness installation groove is communicated with the magnetic steel installation groove; A detection device, at least part of which is accommodated in the wiring harness installation groove, and the detection device has a detection end, and the detection end is arranged in the magnetic steel installation groove to detect the temperature of the magnetic steel.

2. The rotor assembly of the motor according to claim 1, characterized in that: Also includes: The magnetic steel is arranged in the magnetic steel installation groove and is spaced from at least part of the inner wall of the magnetic steel installation groove to form a receiving cavity. The detection end is received in the receiving cavity and is attached to the magnetic steel to detect the temperature of the magnetic steel.

3. The rotor assembly of the motor according to claim 2, characterized in that: The wiring harness installation slot comprises: A first slot body, the first slot body extending in the radial direction of the rotating shaft and recessed toward the rotor core; The second slot body is recessed toward the rotor core, one end of the second slot body is connected to the first slot body, and the other end of the second slot body is connected to the magnetic steel installation slot.

4. The rotor assembly of the motor according to claim 3, characterized in that: The magnetic steel installation grooves are structured in multiples and are arranged around the circumference of the rotating shaft. The second groove bodies are structured in multiples, and the multiple second groove bodies are respectively connected to the multiple magnetic steel installation grooves one by one.

5. The rotor assembly of the motor according to claim 3, characterized in that: A receiving groove extending in the axial direction is formed in the rotating shaft, and at least another part of the detection device is received in the receiving groove.

6. The rotor assembly of the motor according to claim 5, characterized in that: The inner wall of the accommodating groove is formed with a mounting hole penetrating along the radial direction, and the mounting hole and the wiring harness mounting groove are arranged opposite to each other in the radial direction.

7. The rotor assembly of the motor according to claim 6, characterized in that: The detection device comprises: a first wiring harness, the first wiring harness being received in the receiving groove; The second wire harness is received in the wire harness installation groove, one end of the second wire harness is connected to the first wire harness through the installation hole, and the other end of the second wire harness is formed with a detection end.

8. The rotor assembly of the motor according to claim 1, characterized in that: The rotor core is formed with a weight-reducing hole extending through the axial direction. The weight-reducing hole is in a plurality and is arranged at intervals in the circumferential direction of the rotating shaft.

9. The rotor assembly of the motor according to claim 1, characterized in that: Also includes: A rotor pressure plate is sleeved on the rotating shaft and cooperates with the rotor core to press the rotor core.

10. A motor, characterized in that: Comprising a rotor assembly as claimed in any one of claims 1 to 9.

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