Magnet unit, rotor, rotary electrical machine, automobile, and rotor manufacturing method

Abstract

In this magnet unit, a magnet member includes at least one magnet and has a columnar shape including a main surface and an end surface having an area smaller than the area of the main surface. A temperature information transmitter is provided on the surface of the magnet member and transmits temperature information of the magnet member. The temperature information transmitter contacts the magnet member. In this temperature information transmitter, a temperature sensitive part detects a surface temperature. A coil is provided on the end surface and outputs information on the temperature detected by the temperature sensitive part.

Description

Magnet unit, rotor, rotating electrical machine, automobile, and method for manufacturing a rotor 【0001】 The present disclosure relates to a magnet unit, a rotor, a rotating electrical machine, an automobile, and a method for manufacturing a rotor. This application claims priority based on Japanese Application No. 2024-218752 filed on December 13, 2024, and incorporates all the descriptions described in the above Japanese application. 【0002】 A rotor provided with a temperature information transmission device is known (see, for example, Patent Document 1). The temperature information transmission device transmits temperature information. The temperature information transmission device is provided in the rotor core. This temperature information transmission device includes a temperature sensing part that detects temperature and a coil that outputs information on the temperature detected by the temperature sensing part. 【0003】 Japanese Patent Application Laid-Open No. 2021-39019 【0004】 In a rotating electrical machine including a rotor and a stator, the temperature inside the rotating electrical machine may rise due to the operation of the rotor rotating inside the rotating electrical machine. The temperature change inside the rotating electrical machine may affect the operation of the rotor. For example, the magnetic force of a magnet may change according to a change in the temperature of the magnet. Therefore, it is conceivable to acquire temperature information in the rotor. 【0005】 Since the rotor rotates at a relatively high speed, there is a risk that the temperature information transmission device detaches from the rotor core due to centrifugal force, causing the rotor to malfunction. Therefore, it is required to ensure the installation strength of the temperature information transmission device with respect to the rotor. In order to accurately detect the temperature of the magnet, an appropriate arrangement of the temperature sensing part is also required. Therefore, when installing the temperature information transmission device, labor and attention are required to ensure an appropriate arrangement of the temperature information transmission device and its installation strength. 【0006】One aspect of this disclosure aims to provide a magnet unit that allows for easy installation of a temperature information transmitting device on a rotor core while ensuring robustness. Another aspect of this disclosure aims to provide a rotor, a rotating electric machine, and an automobile in which robustness can be ensured. Yet another aspect of this disclosure aims to provide a method for manufacturing a rotor that allows for easy installation of a temperature information transmitting device on a rotor core while ensuring robustness. 【0007】 A magnet unit according to one embodiment comprises a magnet member and a temperature information transmitting device. The magnet member includes at least one magnet. The magnet member has a columnar shape with a main surface and an end surface having an area smaller than the area of ​​the main surface. The temperature information transmitting device is provided on the surface of the magnet member and transmits temperature information of the magnet member. The temperature information transmitting device is in contact with the magnet member. The temperature information transmitting device includes a temperature sensing element and a coil. The temperature sensing element detects the temperature of the magnet member. The coil is provided on the end surface of the magnet member and outputs temperature information detected by the temperature sensing element. 【0008】 In the magnet unit according to one embodiment described above, the temperature information transmitting device is provided on the surface of the magnet member. The temperature sensing part is in contact with the magnet member. The coil is provided on the end face of the magnet member. In this case, since the temperature information transmitting device and the magnet member are configured together as a magnet unit, the temperature information transmitting device can be easily installed on the rotor core and robustness can be ensured. 【0009】 In the magnet unit according to one embodiment described above, the surface of the magnet unit may consist of first and second end faces located opposite each other in a direction intersecting the end face of the magnet member, and a connecting surface connecting the first and second end faces. The connecting surface is formed flush with the end face of the magnet member in a direction intersecting the end face. In this case, the handling of the magnet unit is improved. For example, it is easier to install it on a rotor. 【0010】In the magnet unit according to one embodiment described above, the temperature-sensing element and the coil may be provided on the end face of the magnet member. The temperature-sensing element may be in contact with the end face of the magnet member. In this case, the temperature-sensing element and the coil can be arranged in a space-saving manner, and the magnet unit can be made more compact. 【0011】 In the magnet unit according to one embodiment described above, the magnet member and the temperature information transmitting device may be bonded to each other. In this case, the magnet member and the temperature information transmitting device are configured as a single unit, improving ease of handling. 【0012】 In the magnet unit according to one embodiment described above, the magnet member may have a side surface that is connected to the end face of the magnet member and extends in a direction intersecting the end face of the magnet member. The temperature sensing part may be in contact with the side surface of the magnet member. In this case, the accuracy of temperature detection of the magnet member is further improved. 【0013】 Another embodiment of the rotor comprises the above-mentioned magnet unit and rotor core. The rotor core rotates while holding the magnet unit. The rotor core has a gap that extends in the direction of the rotation axis of the rotor core. The magnet unit is positioned in the gap such that, when viewed from the direction of the rotation axis, the coil is exposed through the gap. In this case, since the temperature information transmitting device and the magnet member are configured together, the robustness of the rotor may be improved. 【0014】 In the rotor of the other embodiment described above, the magnetic member may be formed with its longitudinal direction aligned with the main surface of the magnetic member and intersecting the end face of the magnetic member. In this case, the magnetic unit has a configuration in which the temperature information transmitting device and the magnetic member are integrated, and the desired magnetic force is provided in the rotor by the magnetic unit. 【0015】 In the rotor of the other embodiment described above, the entire magnet unit may overlap with the rotor core when viewed from a direction perpendicular to the rotation axis. In this case, failure of the temperature information transmission device due to the centrifugal force of the rotor is further suppressed. 【0016】Another embodiment of a rotating electric machine includes a stator, the rotor, and a temperature information receiving device. The temperature information receiving device is provided on the stator and includes a coil that is magnetically coupled to the rotor's coil. In this case, the robustness of the rotating electric machine can be improved because the temperature information transmitting device and the magnetic member are configured together. 【0017】 In yet another embodiment, the automobile is equipped with the above-mentioned rotating electric machine. In this case, the temperature information transmitting device and the magnetic member are configured together, which can improve the robustness of the automobile. 【0018】 A further embodiment of the rotor manufacturing method involves inserting the magnet unit into a gap extending in the direction of the rotation axis of the rotor core, such that the coil is exposed from the rotor core when viewed from the direction of the rotation axis. The magnet unit comprises a magnet member and a temperature information transmitting device. The magnet member includes at least one magnet. The magnet member has a columnar shape with a main surface and an end surface having an area smaller than the area of ​​the main surface. The temperature information transmitting device includes a temperature-sensing part that contacts at least one magnet and detects the surface temperature, and a coil provided on the end surface that outputs temperature information detected by the temperature-sensing part. The rotor core rotates while holding the magnet unit. In this case, the temperature information transmitting device can be easily installed on the rotor core, and a rotor with robustness can be manufactured. 【0019】 According to one aspect of this disclosure, a magnet unit is provided that allows for easy installation of a temperature information transmitting device on a rotor core while ensuring robustness. Another aspect of this disclosure provides a rotor, a rotating electric machine, and an automobile in which robustness can be ensured. Yet another aspect of this disclosure provides a method for manufacturing a rotor that allows for easy installation of a temperature information transmitting device on a rotor core while ensuring robustness. 【0020】Figure 1 is a schematic diagram showing the configuration of a rotating electric machine according to one embodiment. Figure 2 is a partial perspective view showing an example of the configuration of a rotor including a magnet unit. Figure 3 is a partial perspective view showing an example of the configuration of a rotor including a magnet unit. Figure 4 is a schematic diagram showing the insertion of a magnet unit into the rotor. Figure 5 is a schematic diagram showing the relationship between the rotor and the magnet unit in a modified example of this embodiment. Figure 6 is a schematic diagram showing the configuration of an electric vehicle. Figure 7 is a partial perspective view showing an example of the configuration of a rotor including a magnet unit in a modified example of this embodiment. Figure 8 is a schematic diagram showing the insertion of a magnet unit into the rotor in a modified example of this embodiment. 【0021】 Embodiments of the present invention will be described in detail below with reference to the attached drawings. In this description, the same reference numerals will be used for the same element or element having the same function, and redundant explanations will be omitted. 【0022】 The configuration of the rotating electric machine MT according to this embodiment will be described with reference to Figures 1 to 4. Figure 1 is a schematic diagram showing the configuration of the rotating electric machine according to this embodiment. 【0023】 As shown in Figure 1, the rotating electric machine MT is, for example, a motor. The motor includes, for example, an IPM motor or an SPM motor. In the following, unless otherwise specified, the case in which the rotating electric machine MT is an IPM motor will be described as an example. As shown in Figure 1, the rotating electric machine MT comprises a stator 10 and a rotor 20. The rotor 20 is located inside the stator 10. 【0024】The rotating electric machine (MT) includes a temperature information transmitting device 50 and a temperature information receiving device 60. The rotating electric machine (MT) detects the internal temperature of the rotating electric machine (MT) using the temperature information transmitting device 50 and the temperature information receiving device 60. The temperature information transmitting device 50 detects the internal temperature of the rotating electric machine (MT) and transmits temperature information related to the detected temperature. The temperature information receiving device 60 receives the temperature information transmitted from the temperature information transmitting device 50. The temperature information transmitting device 50 is provided on the rotor 20. The temperature information receiving device 60 is provided on the stator 10. The temperature information receiving device 60 is provided, for example, on the stator core. In the example shown as this embodiment, the rotating electric machine (MT) includes one temperature information receiving device 60 and a plurality of temperature information transmitting devices 50. 【0025】 The stator 10 includes a cylindrical stator core (not shown) arranged to surround the outer circumference of the rotor 20, and a plurality of stator coils 11. The stator 10 may further include a case that surrounds the stator core, the plurality of stator coils 11, and the rotor 20. A uniform width air gap is provided between the stator 10 and the rotor 20. "Uniform width" does not necessarily mean that the width of each air gap between the stator 10 and the rotor 20 is uniform. The width of each air gap between the stator 10 and the rotor 20 may be considered uniform even if there are slight differences, manufacturing errors, or measurement errors within a preset range. If there are slight differences within a preset range, for example, the width of each air gap between the stator 10 and the rotor 20 may be considered uniform if it is within ±10% of the average width of all air gaps. The stator core holds the plurality of stator coils 11. Each stator coil 11 is positioned on the inner circumference side of the stator core. The multiple stator coils 11 are arranged at equal angular intervals with respect to the rotation axis of the rotor 20. 【0026】The rotor 20 includes a shaft 21, a rotor core 23, and a plurality of magnet units 30. The rotor core 23 holds the magnet units 30. The rotor core 23 rotates while holding the magnet units 30. The shaft 21 is mounted on the rotation axis of the rotor core 23. The shaft 21 has a cylindrical shape. The rotor core 23 has a cylindrical shape. The rotor core 23 has an axial hole into which the shaft 21 is fitted. The shaft 21 and the rotor core 23 rotate integrally around the central axis of the shaft 21. 【0027】 The rotor core 23 includes a pair of end faces 23a and 23b and one side. End face 23a is located closer to the temperature information receiving device 60. End face 23b is located on the opposite side of end face 23a in the rotation axis direction D. That is, the pair of end faces 23a and 23b are perpendicular to the rotation axis direction D and face opposite directions to each other. The statement that "the pair of end faces 23a and 23b are perpendicular to the rotation axis direction D" does not necessarily mean that the pair of end faces 23a and 23b are perpendicular to the rotation axis direction D. The pair of end faces 23a and 23b may be considered perpendicular to the rotation axis direction D even if there are slight differences, manufacturing errors, or measurement errors within a preset range. If there are slight differences within a preset range, for example, if the angle between the pair of end faces 23a and 23b and the rotation axis direction D is within ±1 degree from the perpendicular, the pair of end faces 23a and 23b may be considered perpendicular to the rotation axis direction D. 【0028】The rotor core 23 is constructed by stacking multiple steel plates in the direction of rotation axis D. The rotor core 23 includes multiple steel plates stacked in the direction of rotation axis D. The steel plates are magnetic. The steel plates may be, for example, silicon steel plates. In the example shown in this embodiment, the steel plate located closest to the temperature information receiving device 60 among the multiple steel plates includes an end face 23a as its surface. The rotor core 23 has a gap S. The gap S extends in the direction of rotation axis D. The gap S has a hollow column shape. For example, the cross-section of the gap S in the direction perpendicular to the direction of rotation axis D has the same shape in the direction of rotation axis D. The gap S is connected to the end face 23a of the rotor core 23 and is defined by the inner surface 23c of the rotor core 23. 【0029】 The magnet unit 30 is inserted into the gap S of the rotor core 23. The magnet unit 30 is positioned on the rotor core 23 along the rotation axis direction D. The magnet unit 30 is positioned on the rotor core 23 such that a magnetic field is generated from the magnet unit 30 in a direction intersecting the rotation axis direction D. 【0030】 The magnet unit 30 has, for example, a columnar shape. In this specification, “columnar shape” means a shape that extends in a predetermined direction such that the cross-sections of the same shape, similar shape, or similar shape are continuous. In this specification, the “cross-section” of the “columnar shape” includes shapes enclosed by straight lines, shapes enclosed by curves, and shapes enclosed by both straight lines and curves, and includes, for example, circular, polygonal, or C-shaped shapes. 【0031】In the example shown as this embodiment, the magnet unit 30 is formed with its longitudinal direction perpendicular to the cross-section, and is inserted into the gap S of the rotor core 23 such that the longitudinal direction of the magnet unit 30 is aligned with the rotation axis direction D. For example, the magnet unit 30 is inserted into the gap S with its longitudinal direction corresponding to the rotation axis direction D. The magnet unit 30 is positioned on the rotor core 23 such that its longitudinal direction is parallel to the central axis of the shaft 21. The statement "the longitudinal direction of the magnet unit 30 is parallel to the central axis of the shaft 21" does not necessarily mean that the longitudinal direction of the magnet unit 30 is parallel to the central axis of the shaft 21. Even if there are slight differences, manufacturing errors, or measurement errors within a predetermined range, the longitudinal direction of the magnet unit 30 may still be considered parallel to the central axis of the shaft 21. If there are slight differences within a predetermined range, for example, if the angle between the longitudinal direction of the magnet unit 30 and the central axis of the shaft 21 is within ±2 degrees, then the longitudinal direction of the magnet unit 30 and the central axis of the shaft 21 may be considered parallel. 【0032】 As a modification of this embodiment, the magnet unit 30 may be formed with the direction along the cross-section as its longitudinal direction, and inserted into the gap S of the rotor core 23 such that the longitudinal direction of the magnet unit 30 intersects with the rotation axis direction D. For example, the magnet unit 30 may be inserted into the gap S with its longitudinal direction perpendicular to the rotation axis direction D. 【0033】 In the example shown in this embodiment, the magnet unit 30 is placed alone inside the gap S of the rotor core 23. As a modification of this embodiment, for example, at least one magnet separate from the magnet unit 30 may be placed together with the magnet unit 30 in the gap S of the rotor core 23. In this case, the magnet unit 30 and at least one magnet separate from the magnet unit 30 are placed in order from the end face 23a of the rotor core 23 toward the end face 23a. 【0034】The magnet unit 30 includes a magnetic member 35 and a temperature information transmitting device 50. In the magnet unit 30, the magnetic member 35 and the temperature information transmitting device 50 are formed together. The magnetic member 35 emits a magnetic force in the magnet unit 30. The magnetic member 35 is positioned on the rotor core 23. In the example shown as this embodiment, the entire magnetic member 35 is located inside the gap S. The temperature information transmitting device 50 outputs temperature information of the magnetic member 35. 【0035】 The magnetic member 35 may, for example, have a columnar shape. The magnetic member 35 may, for example, have a rectangular parallelepiped shape. The longitudinal direction of the magnetic member 35 coincides with the longitudinal direction of the magnetic unit 30. In the example shown in this embodiment, the magnetic member 35 is formed with the longitudinal direction perpendicular to the cross-section. As a modification of this embodiment, the magnetic member 35 may be formed with the longitudinal direction along the cross-section. 【0036】 The magnetic member 35 includes at least one magnet. In the example shown in this embodiment, the magnetic member 35 consists of a single, inseparable magnet formed with its longitudinal direction perpendicular to the cross-section. For example, the magnetic member 35 consists of a single, inseparable magnet positioned with its longitudinal direction in the direction of the rotation axis D when the magnetic unit 30 is inserted into the gap S. 【0037】 In a modified version of this embodiment, the magnetic member 35 consists of a single, indivisible magnet formed with the longitudinal direction being along the cross-section. For example, the magnetic member 35 consists of a single, indivisible magnet positioned with the longitudinal direction being intersecting the rotation axis direction D when the magnetic unit 30 is inserted into the gap S. 【0038】As a variation of this embodiment, the magnetic member 35 may be formed by a combination of multiple magnets. In this case, for example, the magnetic member 35 may consist of multiple magnets arranged in the longitudinal direction of the magnetic member 35. For example, the magnetic member 35 may consist of multiple magnets arranged in a direction perpendicular to the cross-section. For example, the magnetic member 35 may consist of multiple magnets arranged in the rotation axis direction D when the magnetic unit 30 is inserted into the gap S. 【0039】 The magnetic member 35 has a pair of end faces 35a and 35b, a pair of side faces 35c, and a pair of main faces 35d. End face 35a is located closer to the temperature information receiving device 60. End face 35b is located on the opposite side of end face 35a in the rotation axis direction D when the magnetic unit 30 is inserted into the gap S. In the example shown as this embodiment, end face 35a and end face 35b are located on opposite sides of each other in the longitudinal direction of the magnetic member 35. As a modification of this embodiment, the pair of side faces 35c may be located on opposite sides of each other in the longitudinal direction of the magnetic member 35. 【0040】 The pair of side faces 35c and the pair of main faces 35d are connected to the end faces 35a and 35b, respectively. The area of ​​the end face 35a, the area of ​​the end face 35b, and the area of ​​each side face 35c are smaller than the area of ​​each main face 35d. Each main face 35d is larger than the area of ​​each other plane on the magnetic member 35. In other words, each main face 35d has the largest area on the surface of the magnetic member 35. The magnetic member 35 generates a magnetic field in the direction normal to the main faces 35d. 【0041】 The pair of side surfaces 35c are located on opposite sides of each other in a direction intersecting the rotation axis direction D when the magnet unit 30 is inserted into the gap S. The pair of main surfaces 35d are located on opposite sides of each other in a direction intersecting the rotation axis direction D when the magnet unit 30 is inserted into the gap S. The pair of main surfaces 35d are connected to the pair of side surfaces 35c. The pair of side surfaces 35c extend in a direction intersecting the end surface 35a of the magnet member 35. 【0042】For example, the pair of end faces 35a and 35b are perpendicular to the rotation axis direction D when the magnet unit 30 is inserted into the gap S, and face opposite directions to each other. The statement that "the pair of end faces 35a and 35b are perpendicular to the rotation axis direction D" does not necessarily mean that the pair of end faces 35a and 35b are perpendicular to the rotation axis direction D. The pair of end faces 35a and 35b may be considered perpendicular to the rotation axis direction D even if there are slight differences, manufacturing errors, or measurement errors within a predetermined range. If there are slight differences within a predetermined range, for example, the pair of end faces 35a and 35b may be considered perpendicular to the rotation axis direction D if the angle between the pair of end faces 35a and 35b and the rotation axis direction D is within ±2 degrees from the perpendicular. In the example shown as this embodiment, the pair of end faces 35a and 35b extend in a direction that intersects the longitudinal direction of the magnet member 35. The magnetic member 35 is formed with its longitudinal direction aligned with the main surface 35d of the magnetic member 35 and intersecting the end faces 35a and 35b of the magnetic member 35. In a modified example of this embodiment, the pair of end faces 35a and 35b may extend along the longitudinal direction of the magnetic member 35, and the pair of side faces 35c may extend in a direction intersecting the longitudinal direction of the magnetic member 35. 【0043】 The central axis of the shaft 21 is the rotation axis of the rotor 20. The direction in which the rotation axis of the rotor 20 extends is the rotation axis direction D of the rotor 20. One magnet member 35 may constitute one pole, or multiple magnet members 35 may constitute one pole. When one magnet member 35 constitutes one pole, the multiple magnet members 35 are arranged at equal angular intervals with respect to the rotation axis of the rotor 20. "Equal angular intervals" does not necessarily mean that each angular interval is the same. The angular intervals may be considered equal even if there are slight differences, manufacturing errors, or measurement errors within a predetermined range. If there are slight differences within a predetermined range, for example, if each angular interval of the magnet member 35 with respect to the rotation axis of the rotor 20 is within ±10% of the average angular interval of all angular intervals, then the angular intervals of the magnet member 35 with respect to the rotation axis of the rotor 20 may be considered equal. 【0044】When the rotating electric machine MT is an IPM motor, the plurality of magnet members 35 are arranged within the rotor core 23. When the rotating electric machine MT is an SPM motor, the plurality of magnet members 35 are arranged on the surface of the rotor core 23. The magnet member 35 is, for example, a permanent magnet. The magnet member 35 includes a rare earth-based magnet. The magnet member 35 includes, for example, a neodymium-based sintered magnet. Each magnet member 35 may include a sintered magnet other than the rare earth-based magnet, or may include a magnet other than the sintered magnet. The magnet other than the sintered magnet includes, for example, a bonded magnet or a hot-worked magnet. 【0045】 As shown in FIGS. 2 and 3, the temperature information transmitting device 50 is inserted into the gap S together with the magnet member 35. FIGS. 2 and 3 are partial perspective views showing an example of the configuration of a rotor including a magnet unit. As shown in FIG. 3, the temperature information transmitting device 50 has, for example, a rectangular parallelepiped shape. 【0046】 The temperature information transmitting device 50 includes a pair of end faces 50a, 50b and a side face 50c. The pair of end faces 50a, 50b are along the end face 35a of the magnet member 35. In the example shown as the present embodiment, the pair of end faces 50a, 50b are located on opposite sides in the longitudinal direction of the magnet member 35. 【0047】 The end face 50a corresponds to the end face of the magnet unit 30. The end face 50a and the end face 50b extend in a direction along the end face 35a of the magnet member 35. The side face 50c is connected to the end face 50a and the end face 50b. The side face 50c extends in a direction intersecting the end face 35a of the magnet member 35 and connects the end face 50a and the end face 50b. In a state where the magnet unit 30 is inserted into the gap S, the side face 50c and the inner face 23c face each other. The end face 50b is in contact with the end face 35a of the magnet member 35. The end face 50b is conceived as a connection surface with the end face 35a of the magnet member 35. The magnet member 35 and the temperature information transmitting device 50 are adhered to each other at the end face 35a and the end face 50b. For example, the magnet member 35 and the temperature information transmitting device 50 are adhered by an adhesive such as an epoxy resin and an acrylic resin. 【0048】The end faces 50a and 50b are perpendicular to the rotational axis direction D and extend along the pair of end faces 35a and 35b in a state where the magnet unit 30 is inserted into the gap S. The fact that "the end face 50a is perpendicular to the rotational axis direction D" does not necessarily only mean that the end faces 50a and 50b are perpendicular to the rotational axis direction D. Even when there are minute differences, manufacturing errors, or measurement errors within a preset range, the end faces 50a and 50b may be considered perpendicular to the rotational axis direction D. When there are minute differences within a preset range, for example, if the angle formed by the end faces 50a and 50b and the rotational axis direction D is within the range of ±2 degrees from perpendicular, the end faces 50a and 50b may be considered perpendicular to the rotational axis direction D. 【0049】 The temperature information transmitting device 50 is provided on the surface of the magnet member 35 and transmits the temperature information of the magnet member 35. In the example shown as this embodiment, the temperature information transmitting device 50 is provided on the end face 35a. The temperature information transmitting device 50 includes a transmission coil 51, a temperature sensing part 52, and a wiring 53. The temperature sensing part 52 detects the temperature of the surface of the magnet member 35. The transmission coil 51 outputs the information on the temperature detected by the temperature sensing part 52. The coil axis of the transmission coil 51 extends in the rotational axis direction D. In other words, the coil axis of the transmission coil 51 extends in the extending direction of the shaft 21. 【0050】 In the example shown as this embodiment, the temperature sensing part 52 and the transmission coil 51 are provided on the end face 35a of the magnet member 35. The temperature sensing part 52 contacts the surface of the magnet member 35 and detects the surface temperature. For example, the temperature sensing part 52 is provided on at least one of the plurality of magnet members 35. For example, as shown in FIG. 4, the temperature sensing part 52 contacts the end face 35a of the magnet member 35. 【0051】The temperature sensing unit 52, the transmitting coil 51, and the wiring 53 are housed in the case 54. The case 54 forms the surface of the temperature information transmitting device 50 and includes a pair of end faces 50a, 50b and a side surface 50c. The case 54 has a rectangular parallelepiped shape and is provided on the end face 35a. In the direction along the end face 35a of the magnet unit 30, the cross-section of the case 54 and the cross-section of the magnet member 35 have the same shape. In the example shown as this embodiment, in the longitudinal direction of the magnet unit 30, the cross-section of the case 54 and the cross-section of the magnet member 35 have the same shape. 【0052】 Case 54 protrudes from the gap S when viewed from a direction perpendicular to the rotation axis direction D. In other words, the end face 50a is positioned to protrude from the end face 23a toward the rotation axis direction D when viewed from a direction perpendicular to the rotation axis direction D. In the example shown as this embodiment, case 54 is not provided on the side surface 35c and the main surface 35d of the magnet member 35. 【0053】 As shown in Figure 4, the magnet unit 30 is inserted into the gap S in a direction α along the rotation axis direction D. The magnet unit 30 is inserted into the gap S from the end face 35b of the magnet member 35. The magnet unit 30 is inserted into the gap S such that, when viewed from the rotation axis direction D, the transmitting coil 51 is exposed from the rotor core 23. The magnet unit 30 is positioned in the gap S such that, when viewed from the rotation axis direction D, the transmitting coil 51 is exposed from the rotor core 23. In the example shown as this embodiment, the length L1 of the magnet unit 30 in the longitudinal direction is longer than the length L2 of the gap S in the rotation axis direction D. 【0054】 As a modification of this embodiment, the length L1 of the magnet unit 30 in the longitudinal direction may be less than or equal to the length L2 of the gap S in the rotation axis direction D. For example, in Figure 5, the length L1 of the magnet unit 30 in the longitudinal direction is the same as the length L2 of the gap S in the rotation axis direction D. In this case, when viewed from a direction perpendicular to the rotation axis direction D, the entire magnet unit 30 overlaps with the rotor core 23. In other words, the entire magnet unit 30 is located inside the gap S. In this case, the magnet unit 30 is more robust. 【0055】In the example shown as this embodiment, the magnet unit 30 has, for example, a rectangular parallelepiped shape. The surface of the magnet unit 30 consists of the end face 50a of the temperature information transmitting device 50 and a connecting surface 30c. The connecting surface 30c connects the end face 35b and the end face 50a of the magnet member 35. The end face 50a and the end face 35b are located on opposite sides of each other in the direction intersecting the end face 35a of the magnet member 35. The connecting surface 30c is formed flush with the surface in the direction intersecting the end face 35a of the magnet member 35. The connecting surface 30c is formed by the side surface 35c and the main surface 35d of the magnet member 35 and the side surface 50c of the temperature information transmitting device 50. The connecting surface 30c faces the inner surface 23c. The side surface 50c and the side surface 35c are formed flush with the surface in the direction intersecting the end face 35a of the magnet member 35. The side surface 50c and the main surface 35d are formed flush with the end surface 35a of the magnet member 35 in the direction intersecting it. In the example shown as this embodiment, the side surface 50c and the side surface 35c are formed flush with the magnet member 35 in the longitudinal direction. The side surface 50c and the main surface 35d are formed flush with the magnet member 35 in the longitudinal direction. 【0056】 The temperature-sensing section 52 includes, for example, a temperature-sensing element. In the example shown as this embodiment, the temperature-sensing section 52 is a temperature-sensing element. The temperature-sensing element of the temperature-sensing section 52 is in contact with the surface of the magnetic member 35 and detects the surface temperature. The temperature-sensing element of the temperature-sensing section 52 is in contact with the end face 35a of the magnetic member 35. The temperature-sensing section 52 may also include components other than the temperature-sensing element, such as a case housing the temperature-sensing element. In the temperature-sensing section 52, the electrical resistance changes according to the temperature of the above-mentioned part. The temperature-sensing section 52 may be, for example, a thermistor or a Hall element. The thermistor may be, for example, an NTC thermistor or a PTC thermistor. When the temperature-sensing section 52 is an NTC thermistor, the electrical resistance in the temperature-sensing section 52 decreases as the temperature rises. 【0057】The temperature sensing unit 52 is electrically connected to the transmitting coil 51. In the example shown in this embodiment, the transmitting coil 51 and the temperature sensing unit 52 are connected by wiring 53. For example, both ends of the transmitting coil 51 are electrically connected to both ends of the temperature sensing unit 52 by wiring 53. In a modified example of this embodiment, a capacitor may be connected to the transmitting coil 51 in parallel with the temperature sensing unit 52. In the example shown in this embodiment, the temperature sensing element of the temperature sensing unit 52 and the transmitting coil 51 are electrically connected using circuit board wiring. For example, the transmitting coil 51 is provided on a circuit board, and both ends of the transmitting coil 51 are connected to wiring 53 by circuit board wiring. In a modified example of this embodiment, the temperature sensing element of the temperature sensing unit 52 and both ends of the transmitting coil 51 may be electrically connected using wire wrapping. 【0058】 The temperature information receiving device 60 includes, for example, a receiving coil and a capacitor (not shown). Hereinafter, the receiving coil of the temperature information receiving device 60 will simply be referred to as the "receiving coil". The receiving coil receives information output from the transmitting coil 51. These receiving coils and the capacitor constitute an LC resonant circuit. The transmitting coil 51, the receiving coil, and the capacitor may constitute an LC resonant circuit. The receiving coil is electrically connected to an AC power supply. The AC power supply may be, for example, an inverter. An AC signal of a predetermined frequency is applied to the receiving coil from the AC power supply. An AC voltage is applied to the receiving coil from the AC power supply. The predetermined frequency is higher than the drive frequency of the rotating electric machine MT. The predetermined frequency is, for example, 10 to 2000 times the drive frequency of the rotating electric machine MT. 【0059】The transmitting coil 51 is magnetically coupled to the receiving coil. The receiving coil is installed on the stator 10 such that it faces the transmitting coil 51 in the direction of the rotation axis D of the rotor 20 when the rotor 20 is at a predetermined rotation angle position. In other words, the transmitting coil 51 and the receiving coil are arranged to face each other in a direction parallel to the rotation axis of the rotor 20 when the rotor 20 is at a predetermined rotation angle position. "A direction parallel to the rotation axis of the rotor 20" does not necessarily mean only a direction parallel to the rotation axis of the rotor 20. Even if it includes slight differences, manufacturing errors, or measurement errors within a preset range, it may still be considered a direction parallel to the rotation axis of the rotor 20. If it includes slight differences within a preset range, for example, if the angle it makes with the rotation axis of the rotor 20 is within ±2 degrees, it may be considered a direction parallel to the rotation axis of the rotor 20. 【0060】 It is preferable that the coil axis of the receiving coil and the coil axis of the transmitting coil 51 coincide when the rotor 20 is at a predetermined rotational angle position, but detection accuracy is ensured as long as the misalignment between the coil axis of the receiving coil and the coil axis of the transmitting coil 51 is within a predetermined range. For example, when the rotor 20 is at a predetermined rotational angle position, the misalignment between the coil axis of the receiving coil and the coil axis of the transmitting coil 51 may be within 15 degrees. If the misalignment between the coil axis of the receiving coil and the coil axis of the transmitting coil 51 is, for example, within 10 degrees when the rotor 20 is at a predetermined rotational angle position, the impact on detection accuracy can be further reduced. 【0061】 A magnetic flux corresponding to the AC voltage applied from the AC power source is generated in the receiving coil. As the rotor 20 rotates and the receiving coil and the transmitting coil 51 move closer together, the magnetic flux generated in the receiving coil passes through the transmitting coil 51. When the magnetic flux generated in the receiving coil passes through the transmitting coil 51, power is generated in the transmitting coil 51 corresponding to the change in magnetic flux passing through the transmitting coil 51. In other words, as the rotor 20 rotates and the receiving coil and the transmitting coil 51 move closer together, the receiving coil and the transmitting coil 51 become magnetically coupled. It can also be said that the receiving coil excites the transmitting coil 51 and supplies power to the transmitting coil 51. 【0062】If the electrical resistance of the temperature-sensing element 52 changes in accordance with the internal temperature of the rotating electric machine MT, the magnetic flux generated in the receiving coil will change in accordance with the change in the electrical resistance of the temperature-sensing element 52. For example, the electrical resistance of the temperature-sensing element 52 changes in accordance with the temperature of the magnetic member 35. The current flowing through the receiving coil will change in accordance with the change in the magnetic flux generated in the receiving coil. 【0063】 When the internal temperature of the rotating electric machine MT rises and the electrical resistance of the temperature-sensing unit 52 decreases, the magnetic flux generated in the receiving coil increases. As a result, the current flowing through the receiving coil increases. When the internal temperature of the rotating electric machine MT falls and the electrical resistance of the temperature-sensing unit 52 increases, the magnetic flux generated in the receiving coil decreases. As a result, the current flowing through the receiving coil decreases. 【0064】 The temperature information receiving device 60 outputs an electrical signal relating to the phase of the power generated in the receiving coil as temperature information of the temperature detected by the temperature sensing unit 52. The temperature information receiving device 60 may include, for example, a computing device including a CPU (Central Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory). The computing device may be, for example, a microcomputer. With this configuration, temperature information relating to the internal temperature of the rotating electric machine MT is transmitted wirelessly between the temperature information transmitting device 50 and the temperature information receiving device 60. 【0065】 The rotating electric machine MT is connected to a control circuit 41. The control circuit 41 is connected to a power supply 43. The control circuit 41 adjusts the drive current from the power supply 43 and supplies three-phase alternating current to each stator coil 11. The control circuit 41 controls the value of the three-phase alternating current supplied to each stator coil 11. The control circuit 41 includes, for example, an inverter circuit. As the three-phase alternating current is supplied to each stator coil 11, each stator coil 11 forms a rotating magnetic field that rotates the rotor 20. The power supply 43 includes, for example, an electrical energy storage device. The electrical energy storage device includes, for example, a secondary battery or a capacitor. 【0066】The electrical signal output from the temperature information receiving device 60 is input to the control circuit 41 as the temperature information. The control circuit 41 acquires the electrical signal output from the temperature information receiving device 60. Based on the acquired electrical signal, the control circuit 41 obtains the internal temperature of the rotating electric machine MT. In other words, in this embodiment, the control circuit 41 functions as a temperature acquisition device. 【0067】 The control circuit 41 obtains the internal temperature of the rotating electric machine MT, for example, as follows. First, the control circuit 41 refers to data showing the relationship between electrical signals and temperature obtained from the temperature information receiving device 60. This data may be stored in the control circuit 41 or in an external server different from the control circuit 41. Next, the control circuit 41 obtains the temperature corresponding to the acquired electrical signal in the above data as the internal temperature of the rotating electric machine MT. 【0068】 The control circuit 41 controls the driving state of the rotating electric machine MT based on the obtained internal temperature of the rotating electric machine MT. For example, the control circuit 41 controls the driving state of the rotating electric machine MT as follows: When the control circuit 41 determines that the obtained internal temperature of the rotating electric machine MT has risen to a predetermined first threshold, the control circuit 41 controls the power supply to limit the rotational speed of the rotating electric machine MT. When the control circuit 41 determines that the obtained internal temperature of the rotating electric machine MT has fallen to a predetermined second threshold that is lower than the first threshold, the control circuit 41 controls the power supply to release the restriction on the rotational speed of the rotating electric machine MT. 【0069】 The control circuit 41 may control the driving state of the rotating electric machine MT as follows. That is, the control circuit 41 may control, for example, the driving frequency input to the rotating electric machine MT based on the obtained internal temperature of the rotating electric machine MT. When the control circuit 41 determines that the obtained internal temperature of the rotating electric machine MT has risen to a predetermined first threshold, the control circuit 41 controls the driving frequency to lower it in order to limit the rotational speed of the rotating electric machine MT. When the control circuit 41 determines that the obtained internal temperature of the rotating electric machine MT has fallen to a predetermined second threshold that is smaller than the first threshold, the control circuit 41 controls the driving frequency to raise it in order to release the limit on the rotational speed of the rotating electric machine MT. 【0070】The control circuit 41 includes, for example, a CPU (Central Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory). The control circuit 41 performs the above-mentioned tasks of obtaining the internal temperature of the rotating electric machine MT and controlling the driving state of the rotating electric machine MT by, for example, loading a program stored in ROM into RAM and executing it with the CPU. 【0071】 Next, the configuration of an electric vehicle equipped with a rotating electric motor (MT) will be described using Figure 6. As shown in Figure 6, the electric vehicle 200 includes a rotating electric motor (MT), a battery 210, a power converter 220, a gear 230, an axle 240, and wheels 250. The electric vehicle 200 operates using the driving force from the rotating electric motor (MT). 【0072】 When the electric vehicle 200 is driven by the rotating electric motor MT, the battery 210 supplies DC power to the power converter 220. The power converter 220 converts the DC power from the battery 210 into AC power and supplies the converted AC power to the rotating electric motor MT. 【0073】 When the electric vehicle 200 performs regenerative braking, the rotating electric motor MT generates alternating current (AC) power in accordance with the vehicle's kinetic energy, and this AC power is supplied to the power converter 220. The power converter 220 converts the AC power from the rotating electric motor MT into DC power and supplies the converted DC power to the battery 210. 【0074】 The rotational torque from the rotating electric motor MT is transmitted to the wheel 250 via the gear 230 and the axle 240. In a modified version of this embodiment, the rotational torque from the rotating electric motor MT may be transmitted to the wheel 250 by a different torque transmission configuration. 【0075】Next, the configuration of another modified example of the rotating electric machine will be described using Figures 7 and 8. This modified example differs from the embodiment described above in terms of the configuration of the magnet unit. The differences between the embodiment described above and this modified example will be mainly described below. Figure 7 is a partial perspective view showing an example of the configuration of a rotor including the magnet unit in a modified example of this embodiment. Figure 8 is a schematic diagram showing the insertion of the magnet unit into the rotor in a modified example of this embodiment. 【0076】 In this modified example, the rotating electric machine MT is equipped with a magnet unit 70 instead of a magnet unit 30. The magnet unit 70 includes a temperature information transmitting device 80 instead of a temperature information transmitting device 50. The temperature information transmitting device 80 includes a temperature sensing unit 82 instead of a temperature sensing unit 52. The temperature sensing unit 82 detects temperature in the same way as the temperature sensing unit 52, and the transmitting coil 51 outputs temperature information detected by the temperature sensing unit 82. 【0077】 The temperature information transmitting device 80 includes an end face 80a, a connecting surface 80b, and a side surface 80c. The end face 80a and the connecting surface 80b are aligned with the end face 35a. In this modified example, the end face 80a and the connecting surface 80b are located on opposite sides of each other in the longitudinal direction of the magnet member 35. The end face 80a corresponds to the end face of the magnet unit 30. The end face 80a and the connecting surface 80b extend in a direction aligned with the end face 35a of the magnet member 35. The side surface 80c extends in a direction intersecting the end face 35a of the magnet member 35. When the magnet unit 70 is inserted into the gap S, the side surface 80c and the inner surface 23c face each other. The connecting surface 80b is in contact with the end face 35a of the magnet member 35. The magnet member 35 and the temperature information transmitting device 80 are bonded to each other at the end face 35a and the connecting surface 80b. For example, the magnetic member 35 and the temperature information transmitting device 80 are bonded together with an adhesive such as epoxy resin or acrylic resin. 【0078】The temperature-sensing section 82 includes, for example, a temperature-sensing element. In this modified example, the temperature-sensing section 82 is a temperature-sensing element. The temperature-sensing section 82 may also include components other than the temperature-sensing element, such as a case for housing the temperature-sensing element. In the temperature-sensing section 82, the electrical resistance changes according to the temperature of the part. The temperature-sensing section 82 may be, for example, a thermistor or a Hall element. The thermistor may be, for example, an NTC thermistor or a PTC thermistor. When the temperature-sensing section 82 is an NTC thermistor, the electrical resistance in the temperature-sensing section 82 decreases as the temperature rises. 【0079】 The transmitting coil 51 and the temperature sensing unit 82 are connected by wiring 53. For example, both ends of the transmitting coil 51 are electrically connected to both ends of the temperature sensing unit 82 by wiring 53. In a further modification of this modification, a capacitor may be connected to the transmitting coil 51 in parallel with the temperature sensing unit 82. In this modification, the temperature sensing element of the temperature sensing unit 82 and the transmitting coil 51 are electrically connected using circuit board wiring. In a further modification of this modification, the temperature sensing element of the temperature sensing unit 82 and both ends of the transmitting coil 51 may be electrically connected using wire wrapping. 【0080】 In this modified example, the temperature-sensing portion 82 is in contact with the side surface 35c of the magnetic member 35. For example, the temperature-sensing portion 82 is provided on at least one of the multiple magnetic members 35. The temperature-sensing portion 82 is in contact with the side surface 35c inside the gap S. 【0081】The temperature sensing element 82, the transmitting coil 51, and the wiring 53 are housed in a case 84. The case 84 has an L-shaped cross-section and is provided on the end face 35a and the side surface 35c. The case 84 protrudes from the side surface 35c in a direction perpendicular to the side surface 35c. At least a portion of the side surface 35c is covered by the case 84. The case 84 has a side surface 80c. In this modified example, the side surface 35c and the side surface 80c form a step in a direction perpendicular to the side surface 35c. The magnet unit 70 includes a side surface 70c which includes the side surface 35c and the side surface 80c. When inserted into the gap S, the side surface 70c faces the inner surface 23c of the rotor core 23 which forms the gap S. In this modified example, the case 84 is not provided on the main surface 35d of the magnet member 35. 【0082】 As described above, in the magnet unit 30, the temperature information transmitting device 50 is provided on the surface of the magnetic member 35. The temperature sensing part 52 is in contact with the magnetic member 35. The transmitting coil 51 is provided on the end face 35a of the magnetic member 35. In this case, since the temperature information transmitting device 50 and the magnetic member 35 are configured together as the magnet unit 30, the temperature information transmitting device 50 can be easily installed on the rotor core 23 and robustness can be ensured. The magnet unit 70 has a similar configuration and provides similar effects. 【0083】 In the magnet unit 30, the surface of the magnet unit 30 may consist of end faces 50a and 35b located on opposite sides of each other in a direction intersecting the end face 35a of the magnet member 35, and a connecting surface 30c that connects the end face 50a and the end face 35b. The connecting surface 30c is formed flush with the end face 35a of the magnet member 35 in a direction intersecting the end face 35a. In this case, the handling of the magnet unit 30 is improved. For example, it is easier to install it on the rotor 20. 【0084】 In the magnet unit 30, the temperature-sensing part 52 and the transmitting coil 51 may be provided on the end face 35a of the magnet member 35. The temperature-sensing part 52 may be in contact with the end face 35a of the magnet member 35. In this case, the temperature-sensing part 52 and the transmitting coil 51 can be arranged in a space-saving manner, and the magnet unit 30 can be made more compact. 【0085】 In the magnet unit 30, the magnetic member 35 and the temperature information transmitting device 50 may be bonded to each other. In this case, the magnetic member 35 and the temperature information transmitting device 50 are integrated, improving ease of handling. The magnet unit 70 has a similar configuration and provides similar effects. 【0086】 In the magnet unit 70, the magnetic member 35 is connected to the end face 35a of the magnetic member 35 and has a side surface 35c that extends in a direction intersecting the end face 35a of the magnetic member 35. The temperature sensing part 82 is in contact with the side surface 35c of the magnetic member 35. In this case, the accuracy of temperature detection of the magnetic member 35 is further improved. 【0087】 The rotor 20 comprises a magnet unit 30 and a rotor core 23. The rotor core 23 rotates while holding the magnet unit 30. The rotor core 23 has a gap S extending in the direction of the rotation axis D. The magnet unit 30 is positioned in the gap S such that, when viewed from the direction of the rotation axis D, the transmitting coil 51 is exposed through the gap S. In this case, since the temperature information transmitting device 50 and the magnet member 35 are configured together, the robustness of the rotor 20 can be ensured. The same effect is achieved even when the magnet unit 30 is replaced with a magnet unit 70. 【0088】 In the rotor 20, the magnetic member 35 may be formed with its longitudinal direction aligned with the main surface 35d of the magnetic member 35 and intersecting the end surface 35a of the magnetic member 35. In this case, the magnetic unit 30 has a configuration in which the temperature information transmitting device 50 and the magnetic member 35 are integrated, and the desired magnetic force in the rotor 20 is provided by the magnetic unit 30. Similar effects are achieved even when the magnetic unit 30 is replaced by a magnetic unit 70. 【0089】In the rotor 20, the entire magnet unit 30 may overlap with the rotor core 23 when viewed from a direction perpendicular to the rotation axis direction D. In this case, failure of the temperature information transmitting device 50 due to the centrifugal force of the rotor 20 is further suppressed. Since the magnet unit 30 is housed in the rotor core 23, interference with other components is prevented. For example, the flow of circulating oil is not obstructed, and cooling efficiency can be ensured. If the magnet unit 70 is provided on the rotor 20, the entire magnet unit 70 may overlap with the rotor core 23 when viewed from a direction perpendicular to the rotation axis direction D. 【0090】 By mounting the rotor 20 on the electric vehicle 200, the operating time of the cooling system for temperature control of the rotating electric machine MT can be appropriately controlled, and the operating time of the cooling system can be reduced. Therefore, the power consumption of the electric vehicle 200 can be reduced. 【0091】 The method for manufacturing the rotor 20 involves inserting the magnet unit 30 into a gap S extending in the direction of rotation axis D of the rotor core 23 such that the transmitting coil 51 is exposed from the rotor core 23 when viewed from the direction of rotation axis D. In this case, a rotor 20 can be manufactured that allows for easy installation of the temperature information transmitting device 50 on the rotor core 23 and ensures robustness. Alternatively, the magnet unit 70 may be inserted into a gap S extending in the direction of rotation axis D of the rotor core 23 such that the transmitting coil 51 is exposed from the rotor core 23 when viewed from the direction of rotation axis D. 【0092】 While embodiments of the present invention have been described above, the present invention is not necessarily limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. 【0093】The examples and modifications shown above as embodiments may be combined as appropriate. For example, in the embodiments and modifications described above, at least a portion of each of the pair of side surfaces 35c of the magnet member 35 is exposed. However, the entire surface of one of the pair of side surfaces 35c may be covered by another member. As a result, the entire magnet unit may be configured in a rectangular parallelepiped shape. For example, in the magnet unit 70, the case 84 may extend to the end surface 35b, and the case 84 may cover the entire surface of one of the pair of side surfaces 35c. In this case, the case 84 with an L-shaped cross-section and the magnet member 35 constitute a rectangular parallelepiped magnet unit. 【0094】 In the example shown in this embodiment, the rotor 20 is equipped with a plurality of magnetic members 35, and each magnetic member 35 is provided with a temperature information transmitting device 50. As a modification of this embodiment, the rotor 20 may be equipped with only one magnetic member 35. For example, of the plurality of magnetic members included in the rotor 20, only one magnetic member 35 may be the magnetic member 35 equipped with the temperature information transmitting device 50. 【0095】As can be understood from the above-described embodiments and modifications, this specification includes the following embodiments: (Note 1) A magnet unit comprising: a magnet member having a columnar shape including a main surface and an end surface having an area smaller than the area of ​​the main surface, which includes at least one magnet; and a temperature information transmitting device provided on the surface of the magnet member and transmitting temperature information of the magnet member, wherein the temperature information transmitting device includes a temperature sensing part that contacts the magnet member and detects the temperature of the magnet member; and a coil provided on the end surface of the magnet member and outputting temperature information detected by the temperature sensing part. (Note 2) The magnet unit according to Note 1, wherein the surface of the magnet unit consists of first and second end surfaces located on opposite sides of each other along the end surface of the magnet member, and a connecting surface connecting the first end surface and the second end surface, the connecting surface being formed flush with the end surfaces in a direction intersecting the end surfaces. (Note 3) The magnet unit according to Note 1 or Note 2, wherein the temperature sensing part and the coil are provided on the end face of the magnet member, and the temperature sensing part is in contact with the end face. (Note 4) The magnet unit according to any one of Notes 1 to 3, wherein the magnet member and the temperature information transmitting device are bonded to each other. (Note 5) The magnet unit according to any one of Notes 1 to 4, wherein the magnet member is connected to the end face of the magnet member and has a side surface extending in a direction intersecting the end face, and the temperature sensing part is in contact with the side surface of the magnet member. (Note 6) A rotor comprising the magnet unit according to any one of Notes 1 to 5, and a rotor core that rotates while holding the magnet unit, wherein the rotor core has a gap extending in the direction of the rotation axis of the rotor core, and the magnet unit is positioned in the gap such that the coil is exposed from the rotor core when viewed from the direction of the rotation axis. (Note 7) The rotor as described in Note 6, wherein the magnetic member is formed with its longitudinal direction aligned with the main surface and intersecting the end surface.(Note 8) The rotor according to Note 6 or Note 7, wherein, when viewed from a direction perpendicular to the rotation axis, the entire magnet unit overlaps with the rotor core. (Note 9) A rotating electric machine comprising a stator, the rotor according to any one of Notes 6 to 8, and a temperature information receiving device provided on the stator and including a coil that magnetically couples with the coil of the rotor. (Note 10) An automobile comprising the rotating electric machine according to Note 9. (Note 11) A method for manufacturing a rotor, comprising: inserting a magnet unit, which includes a magnet member having a columnar shape with a main surface and an end surface having an area smaller than the area of ​​the main surface, into a gap extending in the direction of the rotation axis of a rotor core that rotates while holding the magnet unit, such that the coil is exposed from the rotor core when viewed from the direction of the rotation axis. The magnet unit comprises a magnet member having a columnar shape with a main surface and an end surface having an area smaller than the area of ​​the main surface, and a temperature information transmitting device which includes a temperature sensing part that is in contact with the at least one magnet and includes a coil that is provided on the end surface and outputs temperature information detected by the temperature sensing part. 【0096】 10...stator, 20...rotor, 23...rotor core, 23a, 23b, 35a, 35b, 50a, 50b, 80a...end faces, 30, 70...magnet units, 30c...connecting surface, 35...magnet member, 35c, 50c, 70c, 80c...side surfaces, 35d...main surface, 50, 80...temperature information transmitting device, 52, 82...temperature sensing part, 60...temperature information receiving device, D...rotation axis direction, MT...rotating electric machine, S...gap, α...direction.

Claims

1. A magnet unit comprising: a magnet member having a columnar shape and including at least one magnet, with a main surface and an end surface having an area smaller than the area of ​​the main surface on its surface; and a temperature information transmitting device provided on the surface of the magnet member and transmitting temperature information of the magnet member, wherein the temperature information transmitting device includes a temperature sensing part that contacts the magnet member and detects the temperature of the magnet member; and a coil provided on the end surface of the magnet member and outputting temperature information detected by the temperature sensing part.

2. The magnet unit according to claim 1, wherein the surface of the magnet unit comprises first and second end faces located opposite each other in a direction intersecting the end face of the magnet member, and a connecting surface connecting the first end face and the second end face, and the connecting surface is formed flush with the end face in a direction intersecting the end face.

3. The magnet unit according to claim 2, wherein the temperature-sensing portion and the coil are provided on the end face of the magnet member, and the temperature-sensing portion is in contact with the end face.

4. The magnetic unit according to claim 1, wherein the magnetic member and the temperature information transmitting device are bonded to each other.

5. The magnet unit according to claim 1, wherein the magnetic member is connected to the end face of the magnetic member and has a side surface extending in a direction intersecting the end face of the magnetic member, and the temperature sensing portion is in contact with the side surface of the magnetic member.

6. A rotor comprising a magnet unit according to any one of claims 1 to 5, and a rotor core that rotates while holding the magnet unit, wherein the rotor core has a gap extending in the direction of the rotation axis of the rotor core, and the magnet unit is positioned in the gap such that the coil is exposed from the rotor core when viewed from the direction of the rotation axis.

7. The rotor according to claim 6, wherein the magnetic member is formed with its longitudinal direction aligned with the main surface of the magnetic member and intersecting the end surface of the magnetic member.

8. The rotor according to claim 6, wherein, when viewed from a direction perpendicular to the rotation axis, the entire magnet unit overlaps with the rotor core.

9. A rotating electric machine comprising a stator, a rotor according to claim 6, and a temperature information receiving device provided on the stator and including a coil that is magnetically coupled to the coil of the rotor.

10. An automobile equipped with the rotating electric machine described in claim 9.

11. A method for manufacturing a rotor, comprising: inserting a magnet unit, which includes a magnet member having a columnar shape with a main surface and an end surface having an area smaller than the area of ​​the main surface, into a gap extending in the direction of the rotation axis of a rotor core that rotates while holding the magnet unit, such that the coil is exposed from the rotor core when viewed from the direction of the rotation axis. The magnet unit comprises a magnet member having a columnar shape with a main surface and an end surface having an area smaller than the area of ​​the main surface, and a temperature information transmitting device which includes a temperature sensing part that is in contact with the at least one magnet and includes a coil that is provided on the end surface and outputs temperature information detected by the temperature sensing part.

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