Rotor manufacturing method, rotor, rotary electric machine, and automobile

Abstract

This manufacturing method for a rotor 20 includes: an integration step for obtaining an element unit 50 in which a temperature sensitive part 55 and a coil 52 are integrated by a housing 53; and an attachment step for attaching the element unit 50 obtained in the integration step to an end surface 23A in the axial direction of a rotor core 23. In the attachment step, the element unit 50 is attached so that the temperature sensitive part 55 abuts on an end surface 25A in the axial direction of a permanent magnet 25.

Description

Method for manufacturing a rotor, rotor, rotating electrical machine, and motor vehicle 【0001】 The present disclosure relates to a method for manufacturing a rotor, a rotor, a rotating electrical machine, and a motor vehicle. 【0002】 A magnet temperature information output device is provided for a rotating electrical machine including a stator and a rotor in which permanent magnets are arranged, and outputs temperature information regarding the temperature of the permanent magnets (see, for example, Patent Document 1). This magnet temperature information output device includes a temperature-sensitive element, a first coil, a second coil, and an output unit. The temperature-sensitive element is provided on the rotor and its electrical resistance changes according to the temperature of the permanent magnet. The first coil is electrically connected to the temperature-sensitive element. The second coil is provided on the stator and magnetically coupled to the first coil. The output unit outputs an electrical signal corresponding to the magnitude of the current flowing through the second coil. 【0003】 Japanese Patent Application Laid-Open No. 2021-39019 【0004】 One aspect of the present disclosure aims to provide a method for manufacturing a rotor that can easily and highly accurately attach a temperature information transmission device. Another aspect of the present disclosure aims to provide a rotor that can easily and highly accurately attach a temperature information transmission device. Still another aspect of the present disclosure aims to provide a rotating electrical machine including the above-described rotor. Still another aspect of the present disclosure aims to provide a motor vehicle including the above-described rotating electrical machine. 【0005】 A method for manufacturing a rotor according to one aspect is a method for manufacturing a rotor including a rotor core, magnets arranged in the rotor core, and a temperature information transmission device that transmits temperature information regarding the temperature of the magnets. The temperature information transmission device has a temperature-sensitive portion having a temperature-sensitive element whose electrical resistance changes according to temperature, and a coil electrically connected to the temperature-sensitive element. The method includes an integration step of obtaining a temperature information transmission device in which the temperature-sensitive portion and the coil are integrated by an integrated member, and an attachment step of attaching the temperature information transmission device obtained in the integration step to an end face in the axial direction of the rotor core. In the attachment step, the temperature-sensitive portion is attached so as to abut against an end face in the axial direction of the magnet. 【0006】In the rotor manufacturing method according to one of the above embodiments, the temperature sensing element and the coil are integrated in the integration process. This allows the temperature sensing element and the coil to be treated as a single component in the rotor manufacturing method. Therefore, in the rotor manufacturing method, the temperature sensing element and the coil can be attached to the rotor core by a single operation of attaching the temperature information transmitting device to the axial end face of the rotor core so that the temperature sensing element abuts against the axial end face of the magnet. Thus, the temperature information transmitting device can be easily attached in the rotor manufacturing method. Furthermore, in the rotor manufacturing method, since the temperature sensing element and the coil are integrated in the temperature information transmitting device, the coil is simultaneously positioned by positioning the temperature sensing element so that it abuts against the axial end face of the magnet. Thus, variations in the arrangement (positional relationship) of the temperature sensing element and the coil can be avoided in the rotor manufacturing method, and the temperature information transmitting device can be attached with high precision. 【0007】 In one of the above embodiments, the temperature-sensing element and the coil may be electrically connected using circuit board wiring or wire wrapping. This method allows for the electrical connection of the temperature-sensing element and the coil. 【0008】 In one embodiment described above, the integration process may involve housing the temperature-sensing element and the coil in a resin case and filling the resin case with resin to form an integrated member, or forming the integrated member by insert molding including the temperature-sensing element and the coil, thereby integrating the temperature-sensing element and the coil. This method allows for the formation of an integrated member that integrates the temperature-sensing element and the coil. In a rotor manufacturing method, forming an integrated member in this manner makes it possible to manufacture a temperature information transmitting device that can suppress component detachment, wire breakage, and cooling oil intrusion. Furthermore, with an integrated member formed in this manner, damage to components can be avoided when attaching the temperature information transmitting device to the rotor core. 【0009】A rotor according to another embodiment comprises a rotor core, a magnet disposed within the rotor core, and a temperature information transmitting device for transmitting temperature information relating to the temperature of the magnet. The temperature information transmitting device has a temperature sensing section having a temperature sensing element whose electrical resistance changes according to temperature, and a coil electrically connected to the temperature sensing element. The temperature sensing section and the coil are integrated by an integrated member. The temperature information transmitting device is positioned at the axial end face of the rotor core, and the temperature sensing section is in contact with the axial end face of the magnet. 【0010】 In the rotor according to the above alternative embodiment, the temperature sensing element and the coil are integrated by an integrated component. This allows the temperature sensing element and the coil to be treated as a single component in the rotor. Therefore, in the rotor, the temperature sensing element and the coil can be attached to the rotor core in a single operation: attaching the temperature information transmitting device to the axial end face of the rotor core so that the temperature sensing element abuts against the axial end face of the magnet. Consequently, the temperature information transmitting device can be easily attached to the rotor during its manufacturing process. Furthermore, in the rotor, since the temperature sensing element and the coil are integrated in the temperature information transmitting device, when attaching the temperature information transmitting device to the rotor core, the coil is simultaneously positioned by positioning the temperature sensing element so that it abuts against the axial end face of the magnet. Consequently, variations in the arrangement (positional relationship) of the temperature sensing element and the coil are avoided during the manufacturing process of the rotor, and the temperature information transmitting device can be attached with high precision. 【0011】 In one of the other embodiments described above, the temperature-sensing element may have a heat-conducting member, and the heat-conducting member may be in contact with the end face of the magnet. In this configuration, the temperature-sensing element does not directly contact the magnet. Therefore, the design flexibility of the rotor can be increased. 【0012】 In one of the other embodiments described above, the heat conduction member may be elastic. In this configuration, the heat conduction member can be pressed against the magnet. This allows the rotor to transmit temperature information, as the temperature sensing element can maintain contact with the magnet even when the rotor core is subjected to rotation, vibration, or other shocks. 【0013】In one of the other embodiments described above, the temperature information transmitting device is provided with an elastic metal member positioned between the temperature information transmitting device and the rotor core, and the temperature sensing part may be biased toward the magnet by the metal member. In this configuration, even when the rotor core is subjected to rotation, vibration, or other shocks, the temperature sensing part can maintain contact with the magnet, and thus temperature information can be transmitted. 【0014】 In one of the other embodiments described above, an elastic sheet or metal member may be provided between the temperature information transmitting device and the rotor core. In this configuration, the distance between the temperature information transmitting device and the rotor core can be adjusted by the sheet or metal member. This allows the rotor to maintain a state in which the temperature sensing part is in contact with the magnet. 【0015】 A rotating electric machine according to yet another embodiment comprises the rotor described above, a stator, and a temperature information receiving device attached to the stator that receives temperature information transmitted from a temperature information transmitting device. 【0016】 Another embodiment of the automobile includes the aforementioned rotating electric machine. 【0017】 According to one aspect of this disclosure, a method for manufacturing a rotor is provided that allows for easy and highly accurate attachment of a temperature information transmitting device. According to another aspect of this disclosure, a rotor is provided that allows for easy and highly accurate attachment of a temperature information transmitting device. According to yet another aspect of this disclosure, a rotating electric machine is provided that includes the rotor described above. According to yet another aspect of this disclosure, an automobile is provided that includes the rotating electric machine described above. 【0018】Figure 1 is a schematic diagram showing the configuration of a magnet temperature information output device and a rotating electric machine according to one embodiment. Figure 2 is a circuit diagram showing an example of a magnet temperature information output device. Figure 3 is a perspective view showing an element unit. Figure 4 is an exploded perspective view of an element unit. Figure 5 is a perspective view showing the element unit attached to the rotor core of a rotor. Figure 6 is a perspective view showing an enlarged part of Figure 5. Figure 7 is a schematic diagram showing the mounting process of the element unit. Figure 8 is a schematic diagram showing the mounting process of the element unit. Figure 9 is a schematic diagram showing the mounting process of the element unit. Figure 10 is a schematic diagram showing the configuration of an electric vehicle. Figure 11 is an exploded perspective view of an element unit according to another embodiment. Figure 12 is a perspective view showing the element unit shown in Figure 11 attached to the rotor core of a rotor. Figure 13 is a schematic diagram showing the mounting process of the element unit shown in Figure 11. Figure 14 is a schematic diagram showing the mounting process of an element unit according to another embodiment. 【0019】 Preferred embodiments of this disclosure will be described in detail below with reference to the attached drawings. In the description of the drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant descriptions will be omitted. 【0020】 Referring to Figure 1, the configuration of the magnet temperature information output device 1 and the rotating electric machine MT equipped with the magnet temperature information output device 1 according to this embodiment will be described. Figure 1 is a schematic diagram showing the configuration of the magnet temperature information output device and the rotating electric machine according to this embodiment. 【0021】 As shown in Figure 1, the magnet temperature information output device 1 is installed on the rotating electric machine MT. The rotating electric machine MT is, for example, a motor. The motor includes, for example, an IPM motor or an SPM motor. 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. 【0022】The rotor 20 includes a shaft 21, a rotor core 23, and a plurality of permanent magnets 25. 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. Each permanent magnet 25 is positioned on the rotor core 23 such that its extending direction is parallel to the central axis of the shaft 21. The statement "the extending direction of the permanent magnet 25 is parallel to the central axis of the shaft 21" does not necessarily mean that the extending direction of the permanent magnet 25 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 extending direction of the permanent magnet 25 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 extending direction of the permanent magnet 25 and the central axis of the shaft 21 is within ±2 degrees, the extending direction of the permanent magnet 25 and the central axis of the shaft 21 may be considered parallel. 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 (axial direction) D of the rotor 20. One magnet may constitute one pole, or multiple magnets may constitute one pole. When one magnet constitutes one pole, the multiple permanent magnets 25 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. Even if there are slight differences, manufacturing errors, or measurement errors within a predetermined range, the angular intervals may be considered equal. If there are slight differences within a predetermined range, for example, if each angular interval with respect to the rotation axis of the rotor 20 of the permanent magnet 25 is within ±10% of the average angular interval of all angular intervals, then each angular interval with respect to the rotation axis of the rotor 20 of the permanent magnet 25 may be considered uniform. 【0023】If the rotating electric machine MT is an IPM motor, the multiple permanent magnets 25 are arranged inside the rotor core 23. If the rotating electric machine MT is an SPM motor, the multiple permanent magnets 25 are arranged on the surface of the rotor core 23. Each permanent magnet 25 includes a rare earth permanent magnet. Each permanent magnet 25 includes, for example, a neodymium sintered magnet. Each permanent magnet 25 may also include a sintered magnet other than a rare earth permanent magnet, or a magnet other than a sintered magnet. The magnet other than a sintered magnet includes, for example, a bonded magnet or a hot-worked magnet. 【0024】 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, if the width of each air gap between the stator 10 and the rotor 20 is within ±10% of the average width of all air gaps, the width of each air gap between the stator 10 and the rotor 20 may be considered uniform. The stator core holds the plurality of stator coils 11. Each stator coil 11 is positioned on the inner circumference 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. 【0025】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. 【0026】 Next, with reference to Figure 2, the configuration of the magnet temperature information output device 1 will be described in more detail. Figure 2 is a circuit diagram showing an example of a magnet temperature information output device. 【0027】 The magnet temperature information output device 1 outputs temperature information relating to the temperature of the permanent magnet 25. To realize this function, the magnet temperature information output device 1 includes an element unit (temperature information transmitting device) 50, an element unit (temperature information receiving device) 70, an electrical resistance element 80, and an output unit 90. In this embodiment, there is one element unit 50 and one element unit 70. The element unit 50 is provided on the rotor 20. The element unit 70 is provided on the stator 10. The element unit 70 is provided, for example, on the stator core. The element unit 50 and the element unit 70 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 rotational 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 slight differences, manufacturing tolerances, or measurement errors within a predetermined range are included, the direction may be considered parallel to the rotation axis of the rotor 20. If slight differences within a predetermined range are included, for example, if the angle with the rotation axis of the rotor 20 is within ±2 degrees, the direction may be considered parallel to the rotation axis of the rotor 20. 【0028】As shown in Figure 2, the element unit 50 includes a temperature-sensing element 51 and a coil 52. The temperature-sensing element 51 and the coil 52 are provided on the rotor 20. The temperature-sensing element 51 is provided on at least one of the multiple permanent magnets 25. In this embodiment, the temperature-sensing element 51 is provided on only one permanent magnet 25. The temperature-sensing element 51 is positioned in contact with the permanent magnet 25. The temperature-sensing element 51 may be positioned in the vicinity of the permanent magnet 25. The electrical resistance of the temperature-sensing element 51 changes according to the temperature of the permanent magnet 25. As the temperature of the permanent magnet 25 rises, the electrical resistance of the temperature-sensing element 51 decreases. The temperature-sensing element 51 may be, for example, a thermistor or a Hall element. The thermistor may be, for example, an NTC thermistor. The coil 52 is electrically connected to the temperature-sensing element 51. In this embodiment, both ends of the coil 52 are electrically connected to both ends of the temperature-sensing element 51. 【0029】The element unit 70 includes a coil 71 and a capacitor 73. The coil 71 is positioned on the stator 10 such that it faces the coil 52 in the direction of the rotation axis D of the rotor 20 when the rotor 20 is at a predetermined rotational angle. The coil 52 and the coil 71 are positioned so that they face each other in the direction of the rotation axis D of the rotor 20 when the rotor 20 is at a predetermined rotational angle. The coil 71 is magnetically coupled to the coil 52. When the rotor 20 is at a predetermined rotational angle, it is preferable that the coil axis of the coil 71 and the coil axis of the coil 52 coincide, but the misalignment between the coil axis of the coil 71 and the coil axis of the coil 52 is sufficient to be within 15 degrees, or even within 10 degrees. If the misalignment between the coil axis of the coil 71 and the coil axis of the coil 52 is within the above range, the impact on detection accuracy is small. The coil 71 is electrically connected to an AC power supply PS. The AC power supply PS may be, for example, an inverter. An AC signal of a predetermined frequency is applied to the coil 71 from the AC power supply PS. An AC voltage is applied to the coil 71 from an AC power supply PS. 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. The capacitor 73 forms an LC resonant circuit with the coil 71. The capacitor 73 may also form an LC resonant circuit with the coil 52 and the coil 71. The capacitor 73 is inserted, for example, so as to be connected in parallel with the coil 71. For example, if the coil 52 constitutes the first coil, the coil 71 constitutes the second coil. 【0030】For example, the predetermined frequency may be less than or equal to a predetermined resonant frequency that excites the coil 52. That is, the frequency of the voltage applied to the coil 71 may be less than or equal to a predetermined resonant frequency that excites the coil 52. The predetermined resonant frequency is, for example, the resonant frequency of a circuit that is equivalent to the circuit in the magnetic temperature information output device 1 when the coil 52 and the coil 71 are magnetically coupled and the temperature of the temperature sensing element 51 is at a predetermined temperature. In this embodiment, the circuit includes the temperature sensing element 51, the coil 52, the coil 71, and the capacitor 73. The predetermined temperature is, for example, room temperature. Room temperature is, for example, 15°C to 30°C. In this embodiment, the predetermined temperature is 25°C. 【0031】 The electrical resistance element 80 is electrically connected to the element unit 70. The electrical resistance element 80 may also be electrically connected to the coil 71. In this embodiment, the electrical resistance element 80 is provided on the stator 10 and is inserted between the coil 71 and the AC power supply PS. 【0032】 The output unit 90 is electrically connected to the element unit 70 and the electrical resistance element 80. The output unit 90 may also be electrically connected to the coil 71. That is, the coil 71 may be electrically connected to the electrical resistance element 80 and the output unit 90. In this embodiment, the output unit 90 is provided on the stator 10. The output unit 90 outputs an electrical signal corresponding to the magnitude of the voltage drop occurring in the electrical resistance element 80. The output unit 90 may output an electrical signal indicating the magnitude of the voltage drop occurring in the electrical resistance element 80. The output unit 90 includes, for example, a voltmeter. The voltmeter may consist of, for example, an arithmetic unit including a CPU (Central Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory). The arithmetic unit may be, for example, a microcomputer. In this case, the voltmeter loads a program stored in the ROM into the RAM and executes it with the CPU to output the electrical signal corresponding to the magnitude of the voltage drop occurring in the electrical resistance element 80 as described above. 【0033】 A magnetic flux corresponding to the AC voltage applied from the AC power source PS is generated in coil 71. As the rotor 20 rotates and coil 71 and coil 52 move closer together, the magnetic flux generated in coil 71 passes through coil 52. When the magnetic flux generated in coil 71 passes through coil 52, power is generated in coil 52 corresponding to the change in magnetic flux passing through coil 52. In other words, as the rotor 20 rotates and coil 71 and coil 52 move closer together, coil 71 and coil 52 become magnetically coupled. Alternatively, it can be said that coil 71 excites coil 52 and supplies power to coil 52. 【0034】 As the electrical resistance of the temperature-sensing element 51 changes in accordance with the temperature of the permanent magnet 25, the magnetic flux generated in the coil 71 changes in accordance with the change in the electrical resistance of the temperature-sensing element 51. As a result, the current flowing through the coil 71 changes. This change in the current flowing through the coil 71 changes the magnitude of the voltage drop that occurs in the electrical resistance element 80. 【0035】 As the temperature of the permanent magnet 25 rises and the electrical resistance of the temperature-sensing element 51 decreases, the magnetic flux generated in the coil 71 increases. As a result, the current flowing through the coil 71 increases, and the magnitude of the voltage drop across the electrical resistance element 80 also increases. As the temperature of the permanent magnet 25 decreases and the electrical resistance of the temperature-sensing element 51 increases, the magnetic flux generated in the coil 71 decreases. As a result, the current flowing through the coil 71 decreases, and the magnitude of the voltage drop across the electrical resistance element 80 also decreases. In other words, as the temperature of the permanent magnet 25 rises, the magnitude of the voltage drop across the electrical resistance element 80 increases. Similarly, as the temperature of the permanent magnet 25 falls, the magnitude of the voltage drop across the electrical resistance element 80 decreases. 【0036】The output unit 90 captures the magnetic flux generated in the coil 71 as the magnitude of the voltage drop occurring in the electrical resistance element 80. The magnitude of the voltage drop captured by the output unit 90 corresponds to the change in the electrical resistance of the temperature sensing element 51, that is, the change in the temperature of the permanent magnet 25. Therefore, the electrical signal output from the output unit 90 includes temperature information related to the temperature of the permanent magnet 25. In other words, the output unit 90 outputs an electrical signal corresponding to the magnitude of the voltage drop occurring in the electrical resistance element 80 as the above temperature information. As a result, temperature information related to the temperature of the permanent magnet 25 is transmitted wirelessly between the element unit 50 and the output unit 90 via the element unit 70. 【0037】 The electrical signal output from the output unit 90 is input to the control circuit 41 as temperature information. The control circuit 41 acquires an electrical signal corresponding to the magnitude of the voltage drop occurring in the electrical resistance element 80 output from the magnet temperature information output device 1. Based on the acquired electrical signal, the control circuit 41 obtains the temperature of the permanent magnet 25. In other words, in this embodiment, the control circuit 41 functions as a magnet temperature acquisition device. 【0038】 The control circuit 41 obtains the temperature of the permanent magnet 25, for example, as follows. First, the control circuit 41 refers to data showing the relationship between the electrical signal corresponding to the magnitude of the voltage drop occurring in the electrical resistance element 80 and the temperature. 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 from the above data as the temperature of the permanent magnet 25. 【0039】 The control circuit 41 controls the driving state of the rotating electric machine MT based on the temperature of the permanent magnet 25 obtained. 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 temperature of the permanent magnet 25 obtained 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 temperature of the permanent magnet 25 obtained 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. 【0040】 The control circuit 41 may control the driving state of the rotating electrical machine MT as follows. That is, the control circuit 41 may control, for example, the driving frequency input to the rotating electrical machine MT based on the obtained temperature of the permanent magnet 25. When the control circuit 41 determines that the obtained temperature of the permanent magnet 25 has risen to a predetermined first threshold value, the control circuit 41 controls to lower the driving frequency so as to limit the rotational speed of the rotating electrical machine MT. When the control circuit 41 determines that the obtained temperature of the permanent magnet 25 has dropped to a predetermined second threshold value smaller than the first threshold value, the control circuit 41 controls to raise the driving frequency so as to release the limitation on the rotational speed of the rotating electrical machine MT. 【0041】 The control circuit 41 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). The control circuit 41 obtains the temperature of the permanent magnet 25 and controls the driving state of the rotating electrical machine MT as described above by, for example, loading a program stored in the ROM into the RAM and executing it with the CPU. 【0042】 Next, referring to FIGS. 3 and 4, the element unit 50 will be described. FIG. 3 is a perspective view showing the element unit 50. FIG. 4 is an exploded perspective view of the element unit 50. 【0043】 As shown in FIGS. 3 and 4, the element unit 50 includes a temperature sensing element 51, a coil 52, and a housing (integrated member) 53. 【0044】 The temperature sensing element 51 is sealed by a sealing member 54. The sealing member 54 is formed of resin. The sealing member 54 has, for example, a cylindrical shape. 【0045】A sheet (heat conductive member) 56 is provided on the end face 54A of the sealing member 54. The sheet 56 is formed of a member having heat conductivity and elasticity. The heat conductivity of the sheet 56 can be, for example, 1 W / mK to 400 W / mK. The sheet 56 may be composed of, for example, a plurality of layers including a heat conductive acrylic layer (non-sticky), a heat conductive low hardness acrylic layer, and a film liner. The thickness of the sheet 56 can be, for example, 0.15 mm to 10 mm. The hardness of the sheet 56 can be, for example, A5 to A90. The temperature sensing element 51 and the sheet 56 constitute the temperature sensing portion 55. 【0046】 The coil 52 is mounted on the substrate 57. The coil 52 is mounted on the substrate 57 by solder. In the present embodiment, the temperature sensing element 51 and the coil 52 are electrically connected using wire wrapping. 【0047】 The housing 53 is a member that integrates the temperature sensing element 51 and the coil 52. The housing 53 is formed of resin. In the present embodiment, the housing 53 is composed of a resin case 53A and a filling resin (not shown). Specifically, the housing 53 is formed by filling resin in a state where the temperature sensing element 51 (sealing member 54) and the coil 52 are housed in the resin case 53A. 【0048】 FIG. 5 is a perspective view showing a state where the element unit 50 is attached to the rotor core 23 of the rotor 20. FIG. 6 is a perspective view showing an enlarged part of FIG. 5. 【0049】 As shown in FIGS. 5 and 6, the element unit 50 is attached to the rotor 20. The element unit 50 is disposed on the end face 23A in the rotational axis direction D of the rotor core 23 of the rotor 20. The element unit 50 is fixed to the rotor 20 by the fixture 58. The fixture 58 attaches the element unit 50 to the rotor core 23 by pressing the housing 53 against the rotor core 23 side. 【0050】The mounting fixture 58 is made of, for example, metal. The mounting fixture 58 has fixing parts 58A and 58B and a holding part 58C. The fixing parts 58A and 58B and the holding part 58C are formed integrally. 【0051】 The fixed parts 58A and 58B are the parts that are fixed to the rotor core 23. The fixed parts 58A and 58B are fixed to the rotor core 23 by screws N. Each of the fixed parts 58A and 58B is provided with screw holes 58D and 58E through which the screws N are inserted. 【0052】 The retaining portion 58C is the part that holds the housing 53. The retaining portion 58C has a channel shape (approximately U-shape). The retaining portion 58C is provided with an opening 58F that exposes the coil 52. 【0053】 The element unit 50 is attached to the rotor core 23 such that the sheet 56 of the temperature sensing part 55 is in contact with the end face 25A of the permanent magnet 25. Figure 7 is a schematic diagram showing the mounting process of the element unit 50. As shown in Figure 7, the sheet 56 is positioned so as to be in contact with the end face 25A of the permanent magnet 25, and when the housing 53 is pressed against the rotor core 23 by the mounting fixture 58, the sheet 56 is compressed. 【0054】 Figure 8 is a schematic diagram showing the mounting process of the element unit 50. As shown in Figure 8, an elastic sheet 59 may be placed between the housing 53 and the end face 23A of the rotor core 23. The elastic sheet 59 is elastic. As shown in Figure 8, when the elastic sheet 59 is placed between the housing 53 and the end face 23A of the rotor core 23, and the housing 53 is pressed towards the rotor core 23 by the mounting fixture 58, the elastic sheet 59 is compressed. 【0055】Figure 9 is a schematic diagram showing the mounting process of the element unit 50. As shown in Figure 9, an elastic member (metal member) 60 may be placed between the housing 53 and the end face 23A of the rotor core 23. The elastic member 60 is, for example, a coil spring. As shown in Figure 9, when the elastic member 60 is placed between the housing 53 and the end face 23A of the rotor core 23 and the housing 53 is pressed towards the rotor core 23 by the mounting fixture 58, the elastic member 60 is compressed. 【0056】 Next, we will explain how to manufacture the rotor 20. 【0057】 First, an element unit 50 is obtained by integrating the temperature sensing element 55 and the coil 52 with a housing 53 (integration step). Specifically, the coil 52 is mounted on a substrate 57, and the temperature sensing element 55 and the coil 52 are electrically connected using wire wrapping. Next, the temperature sensing element 55 and the coil 52 are housed in a resin case and filled with resin. This completes the housing 53, and the temperature sensing element 55 and the coil 52 are integrated. 【0058】 Next, the element unit 50 is attached to the end face 23A of the rotor core 23 in the direction of the rotation axis D (attachment step). Specifically, the element unit 50 is positioned on the rotor core 23 such that the sheet 56 of the temperature sensing part 55 contacts the end face 25A of the permanent magnet 25 in the direction of the rotation axis D. Then, the element unit 50 is fixed to the rotor core 23 using the mounting fixture 58. This attaches the element unit 50 to the rotor core 23. The rotor 20 is then manufactured. 【0059】 A rotating electric motor (MT) may be installed in an electric vehicle. Figure 10 is a schematic diagram showing the configuration of an electric vehicle. As shown in Figure 10, 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 is powered by the driving force from the rotating electric motor (MT). 【0060】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. 【0061】 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. 【0062】 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. 【0063】 When a rotor or rotating electric machine according to one aspect of this disclosure is mounted on an automobile, 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. As a result, the power consumption of the automobile can be reduced. 【0064】As described above, in the manufacturing method of the rotor 20 according to this embodiment, the temperature-sensing part 55 and the coil 52 are integrated in the integration process. This allows the temperature-sensing part 55 and the coil 52 to be treated as a single component in the manufacturing method of the rotor 20. Therefore, in the manufacturing method of the rotor 20, the temperature-sensing part 55 and the coil 52 can be attached to the rotor core 23 in a single operation: attaching the element unit 50 to the end face 23A of the rotor core 23 in the rotation axis direction D of the permanent magnet 25 so that the temperature-sensing part 55 abuts against the end face 25A in the rotation axis direction D of the permanent magnet 25. Thus, the element unit 50 can be easily attached in the manufacturing method of the rotor 20. Furthermore, in the manufacturing method of the rotor 20, since the temperature-sensing part 55 and the coil 52 are integrated in the element unit 50, the coil 52 is simultaneously positioned by positioning the temperature-sensing part 55 so that it abuts against the end face 25A of the permanent magnet 25. Therefore, in the manufacturing method of the rotor 20, variations in the arrangement (positional relationship) of the temperature sensing element 55 and the coil 52 are avoided, and the element unit 50 can be mounted with high precision. 【0065】 In the manufacturing method of the rotor 20 according to this embodiment, in the integration process, the temperature-sensing unit 55 and the coil 52 are housed in a resin case, and a housing 53 is formed by filling the resin case with resin, thereby integrating the temperature-sensing unit 55 and the coil 52. This method makes it possible to form a housing 53 that integrates the temperature-sensing unit 55 and the coil 52. In the manufacturing method of the rotor 20, by forming the housing 53 in this way, an element unit 50 can be manufactured that can suppress the detachment of parts, wire breakage, and the intrusion of cooling oil. Furthermore, with a housing 53 formed in this way, damage to parts can be avoided when attaching the element unit 50 to the rotor core 23. 【0066】 In the rotor 20 according to this embodiment, the temperature sensing element 55 has a sheet 56. In the rotor 20, the sheet 56 is in contact with the end face 25A of the permanent magnet 25. In this configuration, the temperature sensing element 51 does not directly contact the permanent magnet 25. Therefore, the rotor 20 can be designed with greater flexibility. 【0067】In the rotor 20 according to this embodiment, the sheet 56 is elastic. In this configuration, the sheet 56 can be pressed against the permanent magnet 25. As a result, even when the rotor core 23 is subjected to rotation, vibration, or other shocks, the temperature sensing part 55 can maintain contact with the permanent magnet 25, and thus temperature information can be transmitted. 【0068】 In this embodiment, the rotor 20 includes an elastic sheet 59 or elastic member 60 that is positioned between the element unit 50 and the rotor core 23 and has elasticity. In this configuration, the distance between the element unit 50 and the rotor core 23 can be adjusted by the elastic sheet 59 or elastic member 60. As a result, the rotor 20 can maintain a state in which the temperature sensing part 55 is in contact with the permanent magnet 25. 【0069】 While embodiments of this disclosure have been described above, this disclosure is not necessarily limited to the embodiments described above, and various modifications are possible without departing from its essence. 【0070】 In the above embodiment, a configuration in which the rotor 20 is equipped with a permanent magnet 25 was described as an example. However, the magnet is not limited to a permanent magnet, and may be, for example, an electromagnet. 【0071】 In the above embodiment, a configuration in which the temperature-sensing element 51 and the coil 52 are electrically connected using wire wrapping was described as one example. However, the temperature-sensing element 51 and the coil 52 may also be electrically connected using circuit board wiring. 【0072】 In the above embodiment, an example was described in which the element unit 50 is attached to the rotor core 23 by a mounting fixture 58. However, the method of attaching the element unit 50 to the rotor core 23 is not limited to this. Figure 11 is an exploded perspective view of the element unit 50 according to another embodiment. Figure 12 is a perspective view showing the element unit 50 shown in Figure 11 attached to the rotor core 23 of the rotor. 【0073】As shown in Figures 11 and 12, the element unit 50 is fixed to the rotor core 23 by a mounting fixture 61. The mounting fixture 61 is made of, for example, an elastic metal. The mounting fixture 61 has an installation portion 61A and holding portions 61B and 61C. The installation portion 61A and the holding portions 61B and 61C are integrally formed. 【0074】 The mounting portion 61A is the part that is installed on the rotor core 23. The retaining portion 61B is folded back at one end in the extending direction of the mounting portion 61A and faces the mounting portion 61A. The retaining portion 61C is folded back at the other end in the extending direction of the mounting portion 61A and faces the mounting portion 61A. The mounting fixture 61 clamps the housing 53 between the mounting portion 61A and the retaining portion 61B, and between the mounting portion 61A and the retaining portion 61C. 【0075】 The mounting fixture 61 is fixed to the rotor core 23 by screws N. The installation portion 61A and the holding portions 61B and 61C are provided with screw holes 61D, 61E, 61F, and 61G through which the screws N are inserted. 【0076】 Figure 13 is a schematic diagram showing the mounting process of the element unit 50. As shown in Figure 13, when the element unit 50 is attached to the rotor core 23 by the mounting fixture 61, the elastic force of the mounting fixture 61 biases the temperature sensing part 55 toward the permanent magnet 25. In this configuration, even when the rotor core 23 is subjected to rotation, vibration, or other shocks, the temperature sensing part 55 can maintain contact with the permanent magnet 25, thereby enabling the transmission of temperature information. 【0077】 In the above embodiment, a configuration in which a sheet 56 is provided on the end face 54A of the sealing member 54 was described as an example. However, as shown in Figure 14, a coil spring (heat conductive member) 62 may be provided on the end face 54A of the sealing member 54. The coil spring 62 has thermal conductivity and elasticity. As shown in Figure 14, the coil spring 62 is positioned to abut against the end face 25A of the permanent magnet 25, and when the housing 53 is pressed towards the rotor core 23 by the mounting fixture 58, the coil spring 62 is compressed. 【0078】As can be understood from the above-described embodiments and modifications, this specification includes the following disclosures: (Note 1) A method for manufacturing a rotor comprising a rotor core, a magnet disposed within the rotor core, and a temperature information transmitting device for transmitting temperature information relating to the temperature of the magnet, wherein the temperature information transmitting device comprises a temperature sensing part having a temperature sensing element whose electrical resistance changes according to temperature, and a coil electrically connected to the temperature sensing element, and includes an integration step to obtain the temperature information transmitting device by integrating the temperature sensing part and the coil with an integrated member, and a mounting step to attach the temperature information transmitting device obtained in the integration step to the axial end face of the rotor core, wherein in the mounting step, the temperature sensing part is attached to the axial end face of the magnet. (Note 2) The method for manufacturing a rotor according to Note 1, wherein the temperature sensing element and the coil are electrically connected using substrate wiring or wire wrapping. (Note 3) The method for manufacturing a rotor according to Note 1 or Note 2, wherein in the integration step, the temperature sensing part and the coil are housed in a resin case and the integrated member is formed by filling the resin case with resin, or the integrated member is formed by insert molding including the temperature sensing part and the coil, and the temperature sensing part and the coil are integrated. (Note 4) A rotor comprising: a rotor core; a magnet disposed within the rotor core; and a temperature information transmitting device for transmitting temperature information relating to the temperature of the magnet, wherein the temperature information transmitting device has a temperature sensing part having a temperature sensing element whose electrical resistance changes according to temperature, and a coil electrically connected to the temperature sensing element, the temperature sensing part and the coil are integrated by an integrated member, the temperature information transmitting device is disposed on the axial end face of the rotor core, and the temperature sensing part is in contact with the axial end face of the magnet. (Note 5) The rotor according to Note 4, wherein the temperature sensing part has a heat conducting member, and the heat conducting member is in contact with the end face of the magnet. (Note 6) The rotor according to Note 5, wherein the heat conducting member is elastic.(Note 7) A rotor according to any one of Notes 4 to 6, comprising an elastic metal member disposed between the temperature information transmitting device and the rotor core, wherein the temperature sensing part is biased toward the magnet by the metal member. (Note 8) A rotor according to any one of Notes 4 to 6, comprising an elastic sheet or metal member disposed between the temperature information transmitting device and the rotor core. (Note 9) A rotating electric machine comprising the rotor according to any one of Notes 3 to 8, a stator, and a temperature information receiving device attached to the stator for receiving the temperature information transmitted from the temperature information transmitting device. (Note 10) An automobile comprising the rotating electric machine according to Note 9. 【0079】 10...Stator, 20...Rotor, 23...Rotor core, 23A...End face, 25...Permanent magnet, 25A...End face, 50...Element unit (temperature information transmitting device), 51...Temperature sensing element, 52...Coil, 53...Housing (integrated member), 55...Temperature sensing part, 56...Sheet (heat conducting member), 59...Elastic sheet, 60...Elastic member (metal member), 62...Coil spring (heat conducting member), 70...Element unit (temperature information receiving device), 200...Electric vehicle (automobile), D...Rotation axis direction (axial direction), MT...Rotating electric machine.

Claims

1. A method for manufacturing a rotor, comprising a rotor core, a magnet disposed within the rotor core, and a temperature information transmitting device for transmitting temperature information relating to the temperature of the magnet, wherein the temperature information transmitting device comprises a temperature sensing section having a temperature sensing element whose electrical resistance changes according to temperature, and a coil electrically connected to the temperature sensing element, and includes an integration step of obtaining the temperature information transmitting device by integrating the temperature sensing section and the coil with an integrated member, and an attachment step of attaching the temperature information transmitting device obtained in the integration step to the axial end face of the rotor core, wherein in the attachment step, the temperature sensing section is attached to the axial end face of the magnet.

2. The method for manufacturing a rotor according to claim 1, wherein the temperature sensing element and the coil are electrically connected using substrate wiring or wire wrapping.

3. The method for manufacturing a rotor according to claim 1 or 2, wherein in the integration step, the temperature sensing element and the coil are housed in a resin case and the integrated member is formed by filling the resin case with resin, or the integrated member is formed by insert molding including the temperature sensing element and the coil, and the temperature sensing element and the coil are integrated.

4. A rotor comprising: a rotor core; a magnet disposed within the rotor core; and a temperature information transmitting device for transmitting temperature information relating to the temperature of the magnet, wherein the temperature information transmitting device comprises a temperature sensing unit having a temperature sensing element whose electrical resistance changes according to temperature, and a coil electrically connected to the temperature sensing element, the temperature sensing unit and the coil being integrated by an integrated member, the temperature information transmitting device being disposed on the axial end face of the rotor core, and the temperature sensing unit being in contact with the axial end face of the magnet.

5. The rotor according to claim 4, wherein the temperature sensing portion has a heat conducting member, and the heat conducting member is in contact with the end face of the magnet.

6. The rotor according to claim 5, wherein the heat conductive member is elastic.

7. The rotor according to claim 4 or 5, comprising an elastic metal member disposed between the temperature information transmitting device and the rotor core, wherein the temperature sensing portion is biased toward the magnet by the metal member.

8. The rotor according to claim 4 or 5, comprising an elastic sheet or metal member disposed between the temperature information transmitting device and the rotor core.

9. A rotating electric machine comprising: the rotor described in claim 4; a stator; and a temperature information receiving device attached to the stator and receiving the temperature information transmitted from the temperature information transmitting device.

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

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