Magnetic temperature detection device and motor

Abstract

To provide a magnetic temperature detection device that can reliably transmit and receive power and temperature data signals with a simple structure. [Solution] A magnet temperature detection device comprising a temperature sensor for detecting the temperature of a permanent magnet provided on a rotor included in a motor, and a power generation communication unit on the rotor side where the rotor is located, wherein the power generation communication unit comprises a power generation rotor, a power generation coil, and a circuit board, the power generation coil and the circuit board are installed on the power generation rotor, the circuit board comprises a power supply circuit that converts AC power generated by the power generation coil into DC power, a temperature detection circuit that converts a signal from the temperature sensor into temperature and outputs temperature data, and a wireless transmission circuit that wirelessly transmits the temperature data output from the temperature detection circuit, and a magnet or magnetic ring facing the power generation rotor is provided on the stator side where the stator included in the motor is located.

Description

Technical Field

[0001] The present invention relates to a magnet temperature detection device for detecting the temperature of a permanent magnet provided in a rotor included in a motor, and a motor using the same.

Background Art

[0002] As a method for improving the output torque density of a driving motor used in an electric vehicle or the like, it is effective to employ a permanent magnet synchronous motor. For further reduction in size and weight of the motor, there is a strong need to increase the rotational speed of the motor.

[0003] However, when the rotational speed of the motor increases, the iron loss of the rotor, which is a rotating part included in the motor, increases and the temperature rise becomes large. Since the permanent magnet provided in the rotor is irreversibly demagnetized when it exceeds a certain high-temperature region, it is necessary to protect the magnet with a drive control device for the driving motor.

[0004] Generally, the magnet temperature is estimated from information such as the temperature of the stator, which is a stationary part included in the motor, and the integrated value of the energization current of the coil. When the magnet temperature becomes equal to or higher than a certain temperature setting value exceeding the above high-temperature region, current limiting is performed to perform protection control so that the magnet temperature does not rise further. However, since an error occurs between the actual magnet temperature and the above estimated temperature, in practice, the drive control device operates with a margin for the above temperature setting value. Therefore, due to that margin, the operation at a high rotational speed or the output of a high torque that could originally be output is not possible, or even if the output is possible, it can only be output for a short time, or the magnet, rotor, housing, etc. become larger than necessary for heat dissipation of the magnet, etc. may occur.

[0005] Therefore, in the conventional technology, a technique has been proposed in which the temperature of the rotor's magnet is detected by a temperature sensor circuit and the detected temperature is transmitted wirelessly, and a power generation coil is provided around the rotor's magnet, and the power generated by the power generation coil due to the change in magnetic flux strength from the stator is used to drive the temperature sensor circuit and wireless transmission circuit, thereby transmitting the detected temperature wirelessly (Patent Document 1).

[0006] Furthermore, in the conventional technology, a system consisting of a stationary stator module and a rotating rotor module having a motor magnet has been introduced in which an electronic circuit in the rotor module detects the temperature of the motor magnet and transmits the detected temperature data to the stator module. In this system, wireless power is supplied from the stator module to the electronic circuit of the rotor module, and the temperature data detected in the rotor module is modulated and superimposed on the wireless power before being sent to the stator module (Non-Patent Document 1). [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 5995759 [Non-patent literature]

[0008] [Non-Patent Document 1] Hajime Yamabayashi, "Development of Rotor Position + Magnetic Temperature Sensor for EV Motors," Nikkan Kogyo Shimbun, Mechanical Design, February 2023 issue (Vol. 67, No. 2). [Overview of the project] [Problems that the invention aims to solve]

[0009] In Patent Document 1, as described above, power is generated by a power generation coil based on changes in the magnetic flux strength from the stator. However, in a permanent magnet synchronous motor, the magnetic flux generated by the stator is synchronized with the rotation of the rotor, so the magnetic flux on the rotor side is at a nearly constant value. In reality, there are small changes in the magnetic flux, so power generation is possible due to the change in magnetic flux, but with such small changes in magnetic flux, it is necessary to increase the magnetic flux passage area of ​​the coil or increase the number of turns in order to generate the required power, and the amount of power that can be obtained is not large.

[0010] As described in Non-Patent Document 1, wireless power transfer requires a power transmission coil and drive circuit on the stator module side, and modulation and demodulation circuits are required to modulate and transmit temperature data signals as wireless power, resulting in a complex structure.

[0011] The objective of this invention is to provide a magnetic temperature detection device and motor that can stably transmit and receive power and temperature data signals with a simple structure, in order to solve the problems of the prior art described above. [Means for solving the problem]

[0012] To achieve the above objective, the magnetic temperature detection device according to the present invention is A magnet temperature detection device comprising a temperature sensor for detecting the temperature of a permanent magnet provided in a rotor included in a motor, and a power generation communication unit, the rotor side where the rotor is located, The aforementioned power generation communication unit includes a power generation rotor, a power generation coil, and a circuit board. The power generation coil and the circuit board are installed on the power generation rotor. The circuit board includes a power supply circuit that converts AC power generated by the power generation coil into DC power, a temperature detection circuit that converts a signal from the temperature sensor into temperature and outputs temperature data, and a wireless transmission circuit that wirelessly transmits the temperature data output from the temperature detection circuit. The magnet temperature detection device further includes a magnet or magnetic ring on the stator side where the stator included in the motor is located, facing the power generation rotor.

[0013] According to the above configuration, the magnetic temperature detection device according to the present invention, by providing the plurality of magnets or magnetic rings for power generation, can enjoy a stable and optimal change in magnetic flux in the power generation coil, and unlike the conventional technology, can obtain sufficient power in the power supply circuit of the circuit board, etc. Furthermore, it eliminates the need for power transmission coils, drive circuits, modulation circuits, and demodulation circuits as in the conventional technology, resulting in a simpler structure. Therefore, this magnetic temperature detection device can stably perform power supply and transmission and reception of temperature data signals with a simple structure.

[0014] In the above configuration, The power generation and communication unit is fixed to the rotating ring of a bearing that rotatably supports the rotor relative to the stator, The magnet or the magnetic ring may be fixed to the fixed ring of the bearing. This allows the power generation and communication unit and the magnet or magnetic ring to be integrated with the bearing, improving ease of assembly during motor manufacturing and facilitating its application to other motors.

[0015] In the above configuration, The power generation communication unit and the magnet or the magnetic ring, Between the rotating ring and the stationary ring of the bearing, Within the end face of the rotating ring of the bearing, which is a surface parallel to the direction in which the rotating ring and the stationary ring of the bearing face each other, and within the end face of the stationary ring, which is a parallel surface, You can arrange them so that they fit. As a result, the power generation and communication unit, and the magnet or magnetic ring, can be integrated into the bearing by arranging them between the rotating ring and the stationary ring of the bearing, so as to fit within the end face of the bearing. This further improves ease of assembly and allows for miniaturization.

[0016] In the above configuration, a receiver or a wireless repeater that receives the temperature data transmitted from the wireless transmission circuit may be disposed inside the motor or inside the motor case. By installing the receiver or the repeater inside the motor or the motor case in this way, even if the case or housing of the motor is, for example, a metal housing, it becomes possible to receive data with high sensitivity from the wireless transmission circuit, and also it becomes possible to transmit data without being inhibited to the outside of the motor.

[0017] In the above configuration, the power generation rotor may be disk-shaped and have a plurality of claw magnetic poles on the circumference in a claw pole type. Thereby, a part of the power generation coil can be, for example, a salient pole structure. Also, in this case, some or all of the claw magnetic poles arranged outside the radial direction of the region where the circuit board is arranged in the power generation rotor may not be present. By reducing the claw magnetic poles arranged outside the radial direction of the region where the circuit board is arranged in this way, the weight balance of the power generation unit is improved, and vibration and noise can be improved. Note that the radial direction refers to the direction orthogonal to the rotation axis of the rotor.

[0018] In the above configuration, a notch may be provided in the region where the circuit board is arranged in the power generation rotor, or in any region outside or inside the radial direction of this region. By providing the notch in the power generation rotor in this way, the weight balance of the power generation unit is improved, and vibration and noise can be improved.

[0019] In the above configuration, the power supply circuit, the temperature detection circuit, and the wireless transmission circuit may be mounted on the annular circuit board. By making the circuit board annular in this way, the weight balance of the power generation unit is improved, and vibration and noise can be improved.

[0020] In order to achieve the above object, the motor according to the present invention includes the rotor and the stator, and the magnet temperature detection device having any of the above configurations. It has. As a result, a motor having the same effect as the magnet temperature detection device having any of the above configurations can be realized.

Effect of the Invention

[0021] The magnet temperature detection device and the motor according to the present invention can stably perform power supply and transmission / reception of temperature data signals with a simple structure.

Brief Description of the Drawings

[0022] [Figure 1] It is an example of a schematic longitudinal sectional view of a motor or the like showing a magnet temperature detection device equipped with a temperature sensor and a power generation communication unit according to a first embodiment of the present invention on a rotor. [Figure 2] It is a schematic longitudinal sectional view showing an enlarged view of the main part of FIG. 1 together with a stator-side magnet or the like provided on the stator side. [Figure 3] It is a cross-sectional view of a motor equipped with the magnet temperature detection device according to the above embodiment. [Figure 4] It is a block diagram showing a circuit configuration of a power generation communication unit in the magnet temperature detection device according to the above embodiment. [Figure 5] It is a conceptual cross-sectional view showing an example of installation of a receiver on the motor case on the stator side. [Figure 6] It is an example of a schematic longitudinal sectional view showing an enlarged view of the main part of a magnet temperature detection device according to a second embodiment of the present invention together with a bearing. [Figure 7] It is a cross-sectional view of a motor and a bearing equipped with the magnet temperature detection device according to the above embodiment. [Figure 8] It is another example of a schematic longitudinal sectional view showing an enlarged view of the main part of the magnet temperature detection device according to the above embodiment together with a bearing. [Figure 9] It is a cross-sectional view showing another example of attachment of a temperature sensor in the magnet temperature detection device according to each of the above embodiments. [Figure 10] It is a cross-sectional view of a motor equipped with the magnet temperature detection device according to each of the above embodiments. (Another claw pole example) [Figure 11] This is a cross-sectional view of a motor equipped with a magnetic temperature detection device according to the above embodiments. (Another example of a claw magnetic pole) [Figure 12] This is a cross-sectional view of a motor equipped with a magnetic temperature detection device according to the above embodiments. (Example of rotor notch) [Figure 13] This is a cross-sectional view of a motor equipped with a magnetic temperature detection device according to the above embodiments. (Example of rotor notch) [Figure 14] This is a cross-sectional view of a motor equipped with a magnetic temperature detection device according to the above embodiments. (Another example of a circuit board) [Figure 15] This is a cross-sectional view of a motor equipped with a magnetic temperature detection device according to the above embodiments. (Another example of a circuit board) [Modes for carrying out the invention]

[0023] Figure 1 shows a magnet temperature detection device and a motor using the same according to the first embodiment of this present invention. Figure 1 mainly depicts a motor 1 having a rotor 3 and a stator 2, and a magnet temperature detection device td. The magnet temperature detection device td is equipped with a temperature sensor 13 for detecting the temperature of a permanent magnet 4 provided on the rotor 3 and a power generation communication unit 7 on the rotor side member 3' on the rotating side or rotor side. Here, the side of the motor 1 on which the stator 2 is provided is called the stator side, and this member is called the stator side member 2'. Also, the side of the motor 1 on which the rotor 3 is provided is called the rotor side, and this member is called the rotor side member 3'.

[0024] In the rotor 3 shown in Figure 1, permanent magnets 4 are embedded in the electromagnetic steel plate 5. While the figure shows an example where the permanent magnets 4 are embedded, this is not the only option; the permanent magnets 4 may also be arranged on the outer diameter surface of the rotor 3. A temperature sensor 13 is attached to or near the permanent magnets 4; in this embodiment, it is attached in contact with the permanent magnets 4. Furthermore, a power generation and communication unit 7 is installed on the shaft 8 of the rotor-side member 3'.

[0025] In this embodiment, the temperature sensor 13 is, for example, a thermistor. However, it is not limited to a thermistor, and other temperature sensors such as resistance thermometers, thermocouples, and temperature sense diodes may also be used. Although only one temperature sensor 13 is shown in the figure, multiple temperature sensors 13 may be provided as needed, and accordingly, multiple temperature detection circuits 21, described later, may be provided.

[0026] The temperature sensor 13 and signal wire Sl are positioned and wired between the permanent magnet 4 and electromagnetic steel plate 5 and the end plate 15. The end plate 15 is normally fixed in contact with the permanent magnet 4 and electromagnetic steel plate 5, but grooves are provided on the inside of the end plate where the temperature sensor 13 and signal wire Sl are positioned and wired, and the temperature sensor 13 and signal wire Sl are fitted into these grooves. By positioning the temperature sensor 13 and its signal wire Sl on the inside of the end plate 15, they can be protected and restrained. As a measure against vibration, resin or the like may be poured into the grooves and molded as needed.

[0027] In Figures 1, 2, and 6, the temperature sensor 13 is positioned on the end face of the permanent magnet 4 in the direction of the rotation axis C. However, it is not limited to this position; if it is an embedded magnet type, it may be positioned inside the flux barrier 31 in the rotor 3 as shown in Figure 9. By positioning it inside the flux barrier 31, the temperature can be measured at a higher temperature location inside the rotor 3.

[0028] Figure 2 shows a schematic longitudinal cross-sectional view of the main part of Figure 1, along with an enlarged view of the power generation magnet or magnetic ring 10 (also called the power generation magnet 10) provided on the stator-side member 2' on the fixed side or stator side, as described later. The cross-sectional view mainly shows the rotor 3 and the power generation communication unit 7. The power generation communication unit 7 consists of a power generation rotor 17, a power generation coil 12, and a circuit board 11. For example, as shown in the figure, the power generation coil 12 and the circuit board 11 are installed on the power generation rotor 17. The magnet or magnetic ring 10 will be collectively referred to as the stator-side magnet, etc., below.

[0029] As shown in Figure 4, the circuit board 11 is equipped with a power supply circuit 20 connected to the power generation coil 12, which receives the AC power generated by the power generation coil 12 and converts it into DC power, a temperature detection circuit 21 that converts the signal from the temperature sensor 13 into temperature and outputs temperature data, and a wireless transmission circuit 22 that wirelessly transmits the temperature data output from the temperature detection circuit 21. These circuits are connected to each other.

[0030] The signal line Sl of the temperature sensor 13, which is attached to the magnet 4 shown in Figure 1, is connected to the circuit board 11 via a connector 14. By providing the connector 14, assembly is simplified as only the subconnector from the temperature sensor 13 and the subconnector from the power generation communication unit 7 need to be connected. In this embodiment, the connector 14 connects wire to wire, but it may also be configured so that the subconnector at the end of the signal line Sl from the temperature sensor 13 is directly connected to a subconnector on the circuit board 11.

[0031] The power generation magnet (stator-side magnet, etc.) 10 is mounted on the stator-side member 2' and is positioned opposite the power generation rotor 17 as shown in the figure. With this arrangement, the power generation coil 12 generates electricity due to the change in magnetic flux of the rotating magnetic field from the stator-side magnet, etc. 10, and the AC power generated by the power generation coil 12 is input to the power supply circuit 20. In the figure, the motor 1 is an example of a radial type, but it may also be an axial type. In this case, the fixed stator-side member 2' in the figure faces the power generation rotor 17 in the radial direction of the rotor 3, but it may also face the power generation rotor 17 in the direction of the rotation axis C of the rotor 3.

[0032] Figure 3 shows a cross-sectional view of the motor 1 along with a side view of the power generation communication unit 7. The power generation rotor 17 is substantially disc-shaped and is of the claw-pole type, having multiple claw-shaped magnetic poles 32 on its circumference or outer circumference. The claw-shaped magnetic poles 32 are those claw poles that have power generation coils 12, and may be some of the claw poles or all of the claw poles. Thus, the power generation rotor 17 and the power generation coils 12 installed on the claw-shaped magnetic poles 32 (not shown in the figure) constitute a claw-pole type generator. On the other hand, the power generation magnets 10 are arranged in an annular shape opposite to the radial direction of the power generation rotor 17. The power generation magnets 10 are provided in a predetermined number and at predetermined intervals in an annular shape, depending on the arrangement of the claw-shaped magnetic poles 32. In the above example, a claw-pole type generator is used, but it is not limited to this, and other types of generators may be used. In addition, multiple magnets may be arranged in an annular shape on the outer circumference of the rotor 3, or a magnetic ring may be used. The circuit board 11 on which the power generation coil 12 is wired is installed, for example, on the side of the power generation rotor 17, that is, on the end face in the direction of axis C, as shown in the figure, and in this embodiment it is fan-shaped.

[0033] Figure 4 mainly shows the circuit configuration of the circuit board. Due to the change in magnetic flux from the power-generating magnet 10, an electromotive force is generated in the power-generating coil 12, and an AC voltage is generated. The AC voltage is converted from AC to DC voltage by the power supply circuit 20, and if necessary, it is stepped up or down to convert it to the specified voltage. At low rotation speeds, stepping up the voltage ensures that the voltage necessary to drive the circuit can be secured even if the generated voltage is small, and at high rotation speeds, stepping down the voltage allows the circuit to be driven with the appropriate voltage.

[0034] The power supply circuit 20 supplies power to the temperature detection circuit 21 and the wireless transmission circuit 22. The temperature detection circuit 21 is connected to a signal line Sl from a temperature sensor 13 installed on the magnet 4, and filters and linearizes the signal from the temperature sensor 13 to convert it into magnet temperature. The magnet temperature is sent from the temperature detection circuit 21 to the wireless transmission circuit 22, which wirelessly transmits it and sends it out to the outside. Here, the wireless communication method used is, for example, BLE (Bluetooth Low Energy). BLE is one of the extensions of the short-range wireless communication technology Bluetooth, and enables communication with extremely low power. However, the wireless communication method is not limited to BLE and other communication methods (for example, WiFi) may also be used.

[0035] Figure 5 shows an example of the installation of a receiver or wireless repeater 23, which receives the temperature data transmitted from the wireless transmission circuit 22, on the stator side 2' of the motor case 16. In automotive drive motors and the like that which handle high voltage and high current, the motor 1 is almost always covered by a metal motor case, and the above wireless transmission to the outside of the motor is blocked. For this reason, it is preferable to install the wireless receiver (or wireless repeater) 23 inside the motor 1 or inside the motor case 16. If the motor housing is made of resin, the wireless receiver 23 may be placed outside the motor 1 or outside the motor case 16, as long as it is within the communication range.

[0036] Figure 6 shows a cross-sectional view of the rotor 3 and power generation communication unit 7 of a second embodiment, different from the embodiment described above. In this embodiment, the power generation communication unit 7 is installed on the rotating ring 19, which is the inner ring of the bearing 6 that rotates and supports the rotor 3 relative to the stator 2, that is, the shaft 8, and the power generation magnet 10 is installed on the stationary ring 18, which is the outer ring of the bearing 6 that is stationary. The bearing in the figure consists of at least the inner ring 19 and outer ring 18 of the bearing, and rollers that are rolling elements between them.

[0037] Figure 7 shows a side view of the power generation communication unit 7 and bearing 6, including the circuit board 11 and the power generation rotor 17. In this embodiment, the circuit configuration and operation overview are the same as in the first embodiment, in that it has multiple claw-pole magnetic poles 32 arranged in an annular shape. In this figure, it is not limited to this, and other types of generators may be used. In addition, multiple magnets may be arranged in an annular shape around the outer circumference of the rotor 3, or a magnetic ring may be used.

[0038] In Figure 6, the power generation communication unit 7 and the power generation magnet 10 protrude from the end face of the bearing 6, but by integrating them into the bearing 6 as shown in Figure 8, that is, by arranging them so that they fit within the end face of the bearing 6 between the rotating wheel 19 and the stationary wheel 18 of the bearing 6, assembly ease can be further improved and the size can be reduced. The end face of the bearing 6 refers to the end face of the rotating wheel 19 on the rotor 3 side, i.e., the end face facing the rotor 3, which is parallel to the direction in which the rotating wheel 19 and the stationary wheel 18 face each other, and also refers to the end face of the stationary wheel 18 on the rotor 3 side, i.e., the end face facing the rotor 3, which is the parallel surface mentioned above.

[0039] In each of the above embodiments (Figures 3, 7, etc.), the circuit board 11 has an arc shape. With this shape of circuit board 11, the weight balance of the power generation communication unit 7 with respect to the rotation axis C is poor, which may cause vibration and noise when the rotor 3 rotates. Therefore, in another embodiment, some or all of the claw magnetic poles 32 located on the radially outer side of the area where the circuit board 11 is located in the power generation rotor 17 are omitted. For example, some or all of the claw magnetic poles 32 on the outer circumference of the area where the circuit board 11 is located with respect to the rotation axis C are reduced. Weight balance may be achieved in this way. Examples of this are shown in Figure 10, which corresponds to the first embodiment, and Figure 11, which corresponds to the second embodiment.

[0040] As another measure, the rotor 3 may have a notch 33 in the region where the circuit board 11 is located, or in a region either radially outward or radially inward from this region. An example in which a notch 33 is provided in part of the rotor 3 is shown in Figure 12, corresponding to the first embodiment, and Figure 13, corresponding to the second embodiment, respectively. Furthermore, an example in which the circuit board is annular instead of arc-shaped is shown in Figure 14, corresponding to the first embodiment, and Figure 15, corresponding to the second embodiment, respectively. By adopting the above configuration, weight balance can be achieved, and vibration and noise can be improved.

[0041] This invention generally relates to a magnet temperature detection device capable of directly detecting the temperature of a permanent magnet, primarily a rotating rotor. For example, the rotation of a motor rotor generates electricity in a power generation coil, which is converted from AC power to DC power in a power supply circuit, and the DC power is supplied to a temperature detection circuit and a wireless transmission circuit. The temperature detection circuit converts the temperature signal from a temperature sensor into temperature data, which is then transmitted from the wireless transmission circuit. The temperature data is received by a wireless receiver, for example, located inside or outside the case, and transmitted externally. Note that after the AC power is converted to DC power in the power supply circuit, step-up or step-down conversion may be performed as needed.

[0042] As described above, this invention allows for the direct detection of the temperature of the permanent magnet, eliminating the need for the aforementioned design temperature margin. This enables higher rotational speeds and higher torque output, or the ability to maintain high rotational speeds or high torque for extended periods. Alternatively, it allows for the reduction of the amount of magnets used and the miniaturization of the rotor and housing while maintaining the same performance as conventional devices, resulting in weight reduction and cost savings. Furthermore, since magnet protection control is performed using the directly detected magnet temperature, reliable protection can be ensured, and demagnetization can be avoided.

[0043] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of symbols]

[0044] 1 Motor, 2 Stator, 2' Stator-side (fixed) component, 3 Rotor, 3' Rotor-side (rotating) component, 4 Permanent magnet, 5 Electromagnetic steel plate, 6 Bearing, 7 Power generation communication unit, 8 Shaft, 10 Power generation magnet (power generation magnet or magnetic ring), 11 Circuit board, 12 Power generation coil, 13 Temperature sensor, 14 Connector, 15 End plate, 16 Motor case, 17 Power generation rotor, 18 Bearing outer ring, 19 Bearing inner ring, 20 Power supply circuit, 21 Temperature detection circuit, 22 Wireless transmission circuit, 23 Wireless receiver, 31 Flux barrier, 32 Claw magnetic pole, 33 Notch, td Magnet temperature detection device

Claims

1. A magnet temperature detection device comprising a temperature sensor for detecting the temperature of a permanent magnet provided in a rotor included in a motor, and a power generation communication unit, the rotor side where the rotor is located, The aforementioned power generation communication unit includes a power generation rotor, a power generation coil, and a circuit board. The power generation coil and the circuit board are installed on the power generation rotor. The circuit board includes a power supply circuit that converts AC power generated by the power generation coil into DC power, a temperature detection circuit that converts a signal from the temperature sensor into temperature and outputs temperature data, and a wireless transmission circuit that wirelessly transmits the temperature data output from the temperature detection circuit. The aforementioned magnet temperature detection device further comprises a magnet or magnetic ring facing the power generation rotor on the stator side where the stator included in the motor is located. Magnetic temperature detection device.

2. A magnetic temperature detection device according to claim 1, The power generation and communication unit is fixed to the rotating ring of a bearing that rotatably supports the rotor relative to the stator, The magnet or the magnetic ring is fixed to the fixed ring of the bearing. Magnetic temperature detection device.

3. A magnetic temperature detection device according to claim 2, The power generation communication unit and the magnet or the magnetic ring, Between the rotating ring and the stationary ring of the bearing, Within the end face of the rotating ring of the bearing, which is a surface parallel to the direction in which the rotating ring and the stationary ring of the bearing face each other, and within the end face of the stationary ring, which is a parallel surface, Arranged to fit, Magnetic temperature detection device.

4. A magnetic temperature detection device according to any one of claims 1 to 3, A receiver or wireless repeater that receives the temperature data transmitted from the wireless transmission circuit is placed inside the motor or motor case. Magnetic temperature detection device.

5. A magnetic temperature detection device according to any one of claims 1 to 3, The aforementioned power generation rotor is disc-shaped and has multiple claw-shaped magnetic poles on its circumference. Magnetic temperature detection device.

6. A magnetic temperature detection device according to claim 5, Some or all of the claw magnetic poles located radially outside the region where the circuit board is arranged in the power generation rotor are absent. Magnetic temperature detection device.

7. A magnetic temperature detection device according to any one of claims 1 to 3, The power generation rotor has a notch in the region where the circuit board is located, or in either the radially outer or radially inner region of this region. Magnetic temperature detection device.

8. A magnetic temperature detection device according to any one of claims 1 to 3, The power supply circuit, the temperature detection circuit, and the wireless transmission circuit are mounted on the annular circuit board. Magnetic temperature detection device.

9. The rotor and the stator, A magnetic temperature detection device according to any one of claims 1 to 3, A motor equipped with [a certain feature].

Images