Tertiary battery transmitter and rotary body temperature measurement system

Abstract

To directly measure the temperature of a rotary body.SOLUTION: A tertiary battery transmitter (30) includes a tertiary battery (31) that charges in response to temperature changes and a radio transmitter (32) that transmits a radio signal in response to the charging voltage of the tertiary battery (31). The tertiary battery transmitter (30) is configured to be attachable to a rotary body. The tertiary battery transmitter (30) receives the radio signal from the radio transmitter (32) via a receiver (40). A control unit measures the temperature of the rotary body in response to the radio signal received by the receiver (40). This makes it possible to directly measure the temperature of the rotary body.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a tertiary battery transmitter equipped with a tertiary battery, and a rotating body temperature measurement system. [Background technology]

[0002] For example, hybrid vehicles, electric vehicles, and the like are equipped with rotating electric machines (hereinafter referred to as "motors") that output driving force, and magnets are used in the rotors of such motors. However, it is known that if the limit temperature is exceeded, the magnets may demagnetize, which may affect the performance and durability of the product. For this reason, it is desirable to determine the temperature of the rotor, but since the motor rotor rotates, it is difficult to place a temperature sensor due to wiring issues. Therefore, a device has been proposed that estimates the temperature of the rotor magnet based on the temperature of the stator coil, the temperature of the coolant, and the like (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-245486 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, since the above-mentioned Patent Document 1 estimates the temperature of the rotor magnet based on the temperature of the surrounding environment, such as the temperature of the stator coil and the temperature of the coolant, there is a limit to the accuracy of the temperature estimation, and for example, even when the temperature approaches the above-mentioned limit temperature, a certain amount of margin needs to be provided, and the temperature range in which the motor is allowed to operate is correspondingly narrower. Therefore, there has been a demand for the development of something that makes it possible to measure the rotor temperature more directly.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a tertiary battery transmitter and a rotor temperature measurement system that are capable of directly measuring the temperature of a rotor. [Means for solving the problem]

[0006] One aspect of the present invention is a tertiary battery transmitter that includes a tertiary battery that charges in response to temperature changes and a wireless transmitter that transmits a wireless signal in response to the charging voltage of the tertiary battery, and is configured to be attachable to a rotating body. Effect of the Invention

[0007] According to the present invention, it is possible to directly measure the temperature of the rotating body. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic diagram showing a vehicle according to a first embodiment. [Diagram 2] 1 is a schematic diagram showing a tertiary battery transmitter according to a first embodiment. FIG. [Diagram 3] FIG. 1(a) is an axial view showing the state in which the rechargeable battery transmitter of the first embodiment is attached to the rotor of a motor, and FIG. 1(b) is a schematic front view showing the state in which the rechargeable battery transmitter of the first embodiment is attached to the rotor of a motor. [Figure 4] 5 is a flowchart showing signal transmission control of the tertiary battery transmitter according to the first embodiment. [Diagram 5] 4 is a time chart showing an example of temperature measurement according to the first embodiment. [Figure 6] 10 is a flowchart showing signal transmission control of a tertiary battery transmitter according to a second embodiment. [Figure 7] 10 is a flowchart showing temperature measurement control of a control unit according to a second embodiment. [Figure 8] 10 is a time chart showing an example of temperature measurement according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] First Embodiment Hereinafter, a rotating body temperature measuring system 1 according to a first embodiment will be described with reference to FIGS.

[0010] [Vehicle configuration] First, the configuration of a vehicle 100 equipped with a rotating body temperature measuring system 1 according to the first embodiment will be described with reference to Fig. 1. Fig. 1 is a schematic diagram showing a vehicle according to the first embodiment. As shown in Fig. 1, the vehicle 100, which is an electric vehicle equipped with the rotating body temperature measuring system 1, travels forward in the upward direction in the figure, and includes left and right front wheels 7FL, 7FR, left and right rear wheels 7RL, 7RR, a rotating electric machine (hereinafter referred to as a "motor") 2 that drives and controls (powering control or regenerative control) the front wheels 7FL, 7FR, a battery unit 3, and a drive circuit 5 that drives and controls the motor 2 by supplying electric power from the battery unit 3 during powering or charging during regeneration.

[0011] In addition, the rotating body temperature measurement system 1 of the first embodiment is composed of a tertiary battery transmitter 30 attached to the motor 2, as described in detail later, a receiver 40 as a receiving unit that receives a radio signal transmitted from the tertiary battery transmitter 30, and a control unit 10 that receives a signal from the receiver 40 and determines the temperature of the motor 2.

[0012] 1, the motor 2 is simply shown as a motor, but is generally configured as a drive unit equipped with a reduction gear mechanism, a differential device, etc., which are not shown. In addition, the control unit 10 that performs various controls in this embodiment is described as being provided in the rotating body temperature measurement system 1, but may be another control unit provided in the vehicle 100.

[0013] [Configuration of the tertiary battery transmitter] Next, the configuration of the tertiary battery transmitter 30 according to the first embodiment will be described with reference to FIG. 2. FIG. 2 is a schematic diagram showing the tertiary battery transmitter according to the first embodiment. The tertiary battery transmitter 30 is attached to the rotor 2R of the motor 2 as a heat source, which will be described in detail later. The tertiary battery transmitter 30 is configured to have a tertiary battery 31 that charges in response to temperature changes in the rotor 2R (heat source) as a rotating body, and a wireless transmitter 32 that transmits a wireless signal in response to the charging voltage of the tertiary battery 31. The wireless signal transmitted from the wireless transmitter 32 is received by a receiver 40 installed in the vehicle 100 (see FIG. 1), and the control unit 10 measures the temperature of the rotor 2R based on the reception.

[0014] The tertiary battery 31 is configured to have a positive electrode 31a and a negative electrode 31b formed of materials with different temperature characteristics, and an electrolyte 31c filled between them. The positive electrode 31a and the negative electrode 31b are electrically connected to a wireless transmitter 32 serving as a wireless transmission unit, and the power of the tertiary battery 31 is supplied to the wireless transmitter 32. In other words, the wireless transmitter 32 is configured to be capable of measuring the charging voltage of the tertiary battery 31 and to transmit a wireless signal using the power charged in the tertiary battery 31.

[0015] Incidentally, thermoelectric elements such as Peltier elements are considered as devices that generate electricity from heat. However, thermoelectric elements such as Peltier elements utilize the temperature difference between two electrodes, and it is difficult to generate electricity in a structure in which two electrodes are arranged in the same temperature zone. In addition, devices that generate electricity using thermoelectric elements require a separate capacitor or a rechargeable secondary battery such as a battery, since the thermoelectric element itself does not have a charging function.

[0016] In contrast, the tertiary battery 31 in this embodiment uses materials with different temperature characteristics for the positive electrode 31a and the negative electrode 31b, and generates power by generating a difference in electromotive force due to temperature changes at the same location, and has a charging function itself. For example, a cobalt Prussian blue analogue is used as such an electrode, and the temperature characteristics can be changed by changing its composition. The tertiary battery 31 can generate power by generating a difference in electromotive force whether the temperature rises or falls, and can be charged regardless of the temperature change.

[0017] And, since the tertiary battery 31 itself has a charging function as described above, there is no need to provide a separate capacitor or battery, and it can be configured compactly. In particular, the electrolyte 31c of the tertiary battery 31 is not limited to a liquid, and can be formed into a powder or paste, so that it can be formed into a thin film (sheet). Furthermore, the wireless transmitter 32 can also be formed of a thin film (sheet) IC chip, that is, the tertiary battery transmitter 30 can be formed into a thin film. Note that the communication standard of the wireless signal of the wireless transmitter 32 may be any communication standard, such as Bluetooth (registered trademark).

[0018] [Installation of tertiary battery transmitter] Next, the installation of the above-mentioned tertiary battery transmitter 30 will be described with reference to Fig. 3(a) and Fig. 3(b). Fig. 3(a) is an axial view showing the state in which the tertiary battery transmitter according to the first embodiment is installed on the rotor of a motor, and Fig. 3(b) is a schematic front view showing the state in which the tertiary battery transmitter according to the first embodiment is installed on the rotor of a motor. Note that in this first embodiment, an example will be described in which the rotor 2R of the motor 2 of the vehicle 100 is the object of temperature measurement, but this is not limiting. The tertiary battery transmitter 30 is suitable for use in locations where wiring is difficult, and is particularly useful when a structure such as a rotating body is the object of temperature measurement.

[0019] As shown in Fig. 3(a), motor 2, which is an interior permanent magnet synchronous motor (IPM motor), is configured with a stator 2S as a stator and a rotor 2R as a rotor, and as shown in Fig. 3(b), rotor 2R is configured by being integrally fitted to a rotary output shaft 2AX. As shown in Fig. 3(a), stator 2S has stator core 21 with an annular yoke, and multiple slits 21a are formed on the inner periphery of stator core 21, and stator windings 22 are wound in each of these slits 21a.

[0020] The rotor 2R is made of a magnetic material such as silicon steel, and is configured by laminating multiple hollow annular steel plates 25, and is fixed to a rotary output shaft 2AX (see FIG. 3(b)) located at the center for rotation control. Each steel plate 25 has a magnet 26 embedded in a slot whose longitudinal direction is along the circumferential direction, and a magnet 27 embedded in a slot whose longitudinal direction is along the radial direction.

[0021] As shown in Fig. 3(a), the tertiary battery transmitter 30 is attached to one of the steel plates 25 of the rotor 2R of the motor 2 configured as described above. The tertiary battery transmitter 30 may be attached to the steel plate 25 arranged at the axial end of the rotor 2R in which the multiple steel plates 25 are laminated (i.e., the outer side surface of the rotor 2R), but in this embodiment, as shown in Fig. 3(b), the tertiary battery transmitter 30 is arranged between the multiple laminated steel plates 25 so as to be embedded inside the rotor 2R. This makes it less susceptible to the environmental temperature outside the rotor 2R, and enables the temperature of the rotor 2R to be measured with high accuracy.

[0022] [Temperature measurement control according to the first embodiment] Next, temperature measurement of the rotor 2R, which is a rotating body, by the rotating body temperature measurement system 1 according to the first embodiment and rotating body cooling control will be described with reference to Fig. 4 and Fig. 5. Fig. 4 is a flowchart showing signal transmission control of the tertiary battery transmitter according to the first embodiment, and Fig. 5 is a time chart showing an example of temperature measurement according to the first embodiment.

[0023] In measuring the temperature of a rotating body (rotor 2R) using the rotating body temperature measuring system 1 of this first embodiment, the tertiary battery transmitter 30 executes signal transmission control to emit a wireless signal according to the temperature, and the control unit 10 receives the wireless signal via the receiver 40 to determine the current temperature of the rotor 2R.

[0024] In detail, when the wireless transmitter 32 of the tertiary battery transmitter 30 (see FIG. 2) starts the signal transmission control as shown in FIG. 4, it first judges whether or not the temperature of the rotating body (here, the rotor 2R) has reached the upper limit threshold Tup (see FIG. 5), which is a threshold value as the first temperature (S1). That is, as shown in FIG. 5, the motor 2 is driven and generates heat, so that the temperature of the rotor 2R rises, and the tertiary battery 31 is charged according to the temperature change of the rotor 2R (in other words, the temperature change of the positive electrode 31a and the negative electrode 31b), so that the charging voltage V rises. As shown in FIG. 4, the wireless transmitter 32 waits until the temperature of the rotor 2R (rotating body) reaches the upper limit threshold Tup (NO in S1), and when the temperature of the rotor 2R reaches the upper limit threshold Tup at time t1 in FIG. 5, for example (YES in S1), it transmits (transmits) the upper limit arrival signal (S2). Note that the power of the tertiary battery 31 is consumed by transmitting this upper limit arrival signal, and the voltage of the tertiary battery 31 basically becomes 0.

[0025] Here, the rotor 2R of the motor 2, which is a rotating body in this first embodiment, has the magnets 26, 27 as described above, and when the temperature of the magnets 26, 27 exceeds the limit temperature Tcr as a criteria temperature (see FIG. 5), demagnetization occurs, causing a decrease in performance of the motor 2 and affecting durability. Therefore, when the temperature of the rotor 2R rises to an upper limit threshold Tup (see FIG. 5) that is set low with a slight margin from the limit temperature Tcr, the control unit 10 executes a drive limit control to limit the drive of the motor 2. As a result, the drive of the motor 2 is limited, and for example, the motor 2 is cooled by circulating cooling water cooled by a radiator or the like, that is, the rotor 2R is cooled. Note that this drive limit control can also be called a rotating body cooling control to cool the rotor 2R as a rotating body.

[0026] On the other hand, as shown in FIG. 4, after transmitting (transmitting) the upper limit arrival signal, the wireless transmitter 32 judges whether or not the temperature of the rotor 2R (rotating body) has reached the lower limit threshold Tlow (see FIG. 5), which is a threshold value as the second temperature (S3). That is, as shown in FIG. 5, the temperature of the rotor 2R decreases by performing the drive limit control of the motor 2 as described above. At this time, even if the temperature of the rotor 2R decreases as described above, the tertiary battery 31 is charged according to the temperature change (in other words, the temperature change of the positive electrode 31a and the negative electrode 31b), and the charging voltage V increases. As shown in FIG. 4, the wireless transmitter 32 waits until the temperature of the rotor 2R reaches the lower limit threshold Tlow (NO in S3), and when the temperature of the rotor 2R reaches the lower limit threshold Tlow at time t2 in FIG. 5, for example (YES in S3), the wireless transmitter 32 transmits (transmits) the lower limit arrival signal (S4).

[0027] That is, the control unit 10 (see FIG. 1) wants to drive the motor 2 within an appropriate temperature range because if the temperature of the motor 2 drops too much, the driving efficiency will decrease. Therefore, when the temperature of the rotor 2R drops to the lower threshold Tlow (see FIG. 5), the drive limit control is stopped and released, that is, the rotating body cooling control is stopped. As a result, the drive limit control for the motor 2 is released, so that the motor 2 can output driving force without restrictions, and the temperature of the motor 2 (i.e., the rotor 2R) will rise.

[0028] Then, the wireless transmitter 32 thereafter repeats the signal transmission control in the same manner. As a result, when the temperature of the rotor 2R reaches the upper limit threshold Tup at time t3 or time t5 in Fig. 5 (YES in S1), the wireless transmitter 32 transmits (transmits) an upper limit reached signal (S2). Also, when the temperature of the rotor 2R reaches the lower limit threshold Tlow at time t4 or time t6 in Fig. 5 (YES in S3), the wireless transmitter 32 transmits (transmits) a lower limit reached signal (S4).

[0029] Note that the charging voltage V of the tertiary battery 31 when it is determined that the upper limit threshold Tup has been reached at time t1, for example, is an initially set voltage value because this is the first time. Thereafter, the charging voltage V of the tertiary battery 31 when it is determined that the upper limit threshold Tup has been reached at time t3 or time t5, for example, becomes a voltage value corresponding to the interval between the upper limit threshold Tup and the lower limit threshold Tlow. In addition, the charging voltage V of the tertiary battery 31 when it is determined that the lower limit threshold Tlow has been reached at time t2, time t4, and time t6, for example, also becomes a voltage value corresponding to the interval between the upper limit threshold Tup and the lower limit threshold Tlow.

[0030] [Summary of the first embodiment] As described above, the tertiary battery transmitter 30 according to the first embodiment generates power using the tertiary battery 31 that charges in response to temperature changes, and transmits a wireless signal using a charging voltage in response to temperature changes, making it possible to directly measure the temperature of the rotor 2R, which is a rotating body that cannot be wired. This allows the control unit 10 of the rotating body temperature measurement system 1 to accurately measure the temperature of the rotor 2R, which is a rotating body, using the wireless signal from the tertiary battery transmitter 30.

[0031] Specifically, in the rotating body temperature measurement system 1 according to the first embodiment, the wireless transmitter 32 transmits a wireless signal when the temperature of the rotor 2R reaches an upper threshold Tup according to the charging voltage of the tertiary battery 31 and when it reaches a lower threshold Tlow lower than the upper threshold Tup, and the control unit 10 determines that the temperature of the rotor 2R is between the upper threshold Tup and the lower threshold Tlow based on the wireless signal received by the receiver 40. This makes it possible to determine that the temperature of the rotor 2R is between the upper threshold Tup and the lower threshold Tlow with high accuracy compared to a method of estimating the temperature of the rotor 2R based on the temperature of the surrounding environment, such as the temperature of the stator coil or the temperature of the cooling water.

[0032] Furthermore, by being able to measure the temperature of the rotor 2R with high accuracy, various controls can also be performed with high accuracy in response to the temperature of the rotor 2R. In other words, if the temperature of the rotor 2R measured to execute or release (stop) drive limit control (cooling control of the rotor) for the motor 2 can be measured with high accuracy, the upper limit threshold Tup can be set closer to the limit temperature Tcr (with a smaller margin), that is, the upper limit threshold for executing the drive limit control can be set higher, thereby widening the temperature range in which the motor 2 can be driven without applying drive limit, and reducing the effects of deterioration in drivability and deterioration in electricity cost (fuel economy).

[0033] <Second embodiment> Next, a second embodiment, which is a partial modification of the first embodiment, will be described with reference to Figures 6 to 8. Figure 6 is a flowchart showing signal transmission control of a secondary battery transmitter according to the second embodiment, Figure 7 is a flowchart showing temperature measurement control of a control unit according to the second embodiment, and Figure 8 is a time chart showing an example of temperature measurement according to the second embodiment.

[0034] In the second embodiment, the contents of the temperature measurement control are changed compared to the first embodiment, in other words, the signal transmission control executed by the wireless transmitter 32 transmits a wireless signal at every predetermined voltage, and the temperature measurement control executed by the control unit 10 calculates and measures the temperature of the rotor 2R as a rotating body. The temperature measurement control of the second embodiment will be described in detail below. In the description of the second embodiment, the same reference numerals are used for the same parts as in the first embodiment, and the description thereof will be omitted.

[0035] [Temperature measurement control according to the second embodiment] In detail, when the wireless transmitter 32 of the tertiary battery transmitter 30 (see FIG. 2) starts the signal transmission control as shown in FIG. 6, it first judges whether or not the charging voltage V of the tertiary battery 31 has reached a predetermined voltage (S11). That is, as shown in FIG. 8, the motor 2 is driven and generates heat, causing the temperature of the rotor 2R to rise, and the charging voltage V of the tertiary battery 31 rises as the tertiary battery 31 is charged according to the temperature change of the rotor 2R (in other words, the temperature change of the positive electrode 31a and the negative electrode 31b). At this time, as shown in FIG. 6, the wireless transmitter 32 waits until the charging voltage V of the tertiary battery 31 reaches the predetermined voltage (NO in S11), and when the charging voltage V of the tertiary battery 31 reaches the predetermined voltage according to the rise of the predetermined temperature Tst of the rotor 2R at time t11 in FIG. 8, for example (YES in S11), it transmits (transmits) the temperature rise signal (S12). It should be noted that the power of the tertiary battery 31 is consumed by transmitting this wireless signal, and the voltage of the tertiary battery 31 basically becomes zero.

[0036] On the other hand, when the control unit 10 (see FIG. 1) starts the temperature measurement control as shown in FIG. 7, first, it judges whether or not a wireless signal is received from the wireless transmitter 32 via the receiver 40 (S21). The control unit 10 waits until it receives a wireless signal (NO in S21), and when it receives a wireless signal at, for example, time point t11 ​​in FIG. 8 (YES in S21), it judges whether or not the temperature of the rotor 2R is rising (S22). Whether or not the temperature of the rotor 2R is rising can be judged by the magnitude of the driving force with which the control unit 10 drives the motor 2 via the drive circuit 5. Here, since the temperature of the rotor 2R is rising (YES in S22), the current temperature of the rotor 2R is calculated by adding a predetermined temperature Tst, which is the amount of temperature change required for the charging voltage V of the tertiary battery 31 to reach a predetermined voltage, to the current temperature of the rotor 2R (S23).

[0037] In this manner, when signal transmission control is executed in the wireless transmitter 32 and temperature measurement control is executed in the control unit 10, for example, at times t12, t13, t14, t15, and t16 in FIG. 8, the temperature of the rotor 2R rises at a predetermined temperature Tst and reaches a predetermined voltage in the tertiary battery 31, so that a wireless signal is transmitted from the wireless transmitter 32 (S12), and calculations are performed such that the current temperature of the rotor 2R rises by adding the predetermined temperature to the current temperature of the rotor 2R.

[0038] Here, for example, at time t16 in Fig. 8, similarly to the first embodiment described above, when the control unit 10 determines that the temperature of the rotor 2R has risen to the upper threshold value Tup (see Fig. 5) that is set low with a margin for the limit temperature Tcr, it executes the drive limit control of the motor 2, that is, starts the rotor cooling control. Then, the temperature of the rotor 2R starts to decrease.

[0039] Therefore, for example, at time t17 in Figure 8, the wireless transmitter 32 transmits a wireless signal as the charging voltage V of the tertiary battery 31 has reached a predetermined voltage, and the control unit 10 receives the wireless signal (YES in S21), but since the temperature of the rotor 2R is decreasing, not rising (NO in S22), the current temperature of the rotor 2R is calculated by subtracting a predetermined temperature Tst, which is the temperature change required for the charging voltage V of the tertiary battery 31 to reach the predetermined voltage, from the current temperature of the rotor 2R (S24).

[0040] Then, for example, at time t17 in Fig. 8, when the temperature of the rotor 2R drops to the lower threshold Tlow (see Fig. 8), the drive limit control is stopped and released, that is, the rotor cooling control is stopped. This releases the drive limit control on the motor 2, allowing the motor 2 to output drive force without limit, and the temperature of the motor 2 (i.e., the rotor 2R) begins to rise again.

[0041] Therefore, when the control unit 10 determines that the temperature of the rotor 2R has risen to the upper threshold value Tup (see FIG. 8), for example, at time t18 or t20 in Fig. 8, it executes the drive limit control of the motor 2, and when the control unit 10 determines that the temperature of the rotor 2R has fallen to the lower threshold value Tlow (see FIG. 8), for example, at time t19 or t21 in Fig. 8, it releases the drive limit control of the motor 2. Thereafter, the temperature measurement control continues in the same manner.

[0042] [Summary of the second embodiment] As described above, the tertiary battery transmitter 30 according to the second embodiment also generates power using the tertiary battery 31 that charges in response to temperature changes, and transmits a wireless signal using a charging voltage in response to temperature changes, making it possible to directly measure the temperature of the rotor 2R, which is a rotating body that cannot be wired. This allows the control unit 10 of the rotating body temperature measurement system 1 to accurately measure the temperature of the rotor 2R, which is a rotating body, using the wireless signal from the tertiary battery transmitter 30.

[0043] Specifically, in the rotating body temperature measurement system 1 according to the first embodiment, the wireless transmitter 32 transmits a wireless signal when the charging voltage V of the tertiary battery 31 reaches a predetermined voltage, and the control unit 10 calculates the current temperature of the rotor 2R by adding or subtracting a predetermined temperature Tst based on the wireless signal received by the receiver 40. This allows the control unit 10 to determine whether the current temperature of the rotor 2R has reached an upper threshold value Tup or a lower threshold value Tlow that is lower than the upper threshold value Tup. This allows the control unit 10 to determine whether the temperature of the rotor 2R has reached the upper threshold value Tup or the lower threshold value Tlow with high accuracy compared to a method of estimating the temperature of the rotor 2R based on the temperature of the surrounding environment, such as the temperature of the stator coil or the temperature of the cooling water.

[0044] Furthermore, by being able to measure the temperature of the rotor 2R with high accuracy, various controls can also be performed with high accuracy in response to the temperature of the rotor 2R. In other words, if the temperature of the rotor 2R measured to execute or release (stop) drive limit control (cooling control of the rotor) for the motor 2 can be measured with high accuracy, the upper limit threshold Tup can be set closer to the limit temperature Tcr (with a smaller margin), that is, the upper limit threshold for executing the drive limit control can be set higher, thereby widening the temperature range in which the motor 2 can be driven without applying drive limit, and reducing the effects of deterioration in drivability and deterioration in electricity cost (fuel economy).

[0045] <Possibilities for other embodiments> In the above-described first and second embodiments, the rotor 2R (particularly the magnet) of the motor 2 is measured as a rotating body. However, the present invention is not limited to this, and any rotating body that is difficult to wire due to rotation can be used as a temperature measurement target. In a vehicle such as an automobile, for example, gears, shafts, rotating parts of pumps, friction plates such as clutches and brakes, camshafts and crankshafts of engines, pulleys of fans and fan belts, rotating parts of air conditioner compressors, rotating parts of alternators, etc. are conceivable. Furthermore, the rotating body is not limited to those mounted on automobiles, and the rotating parts of various vehicles, transportation machines, and various machines may be used as temperature measurement targets. Examples of various vehicles include trucks, buses, work vehicles, trains, etc. Examples of transportation machines include airplanes and ships, etc. Examples of various machines include machine tools, robots, production equipment, computer parts, etc.

[0046] In addition, in the first and second embodiments described above, a tertiary battery using a cobalt Prussian blue analogue for the electrodes has been described as an example, but the present invention is not limited to this. Any material may be used as long as the electrodes generate a difference in electromotive force in response to temperature changes and the tertiary battery can be charged.

[0047] Furthermore, in the first and second embodiments described above, the tertiary battery transmitter 30 is attached (attached) to the steel plate 25 of the rotor 2R in order to measure the temperature of the rotor 2R, but the present invention is not limited to this. The tertiary battery transmitter 30 may be attached directly to a magnet, or a space may be provided in the steel plate for embedding the tertiary battery transmitter 30, or the tertiary battery transmitter 30 may be attached in an air gap on the outer periphery of the rotor 2R so as to face the inner periphery of the stator 2S, or in other words, the tertiary battery transmitter 30 may be attached to any part of the rotor 2R.

[0048] Furthermore, in the first and second embodiments described above, an example has been described in which the wireless transmitter transmits a wireless signal using a communication standard such as Bluetooth (registered trademark). However, the present invention is not limited to this. For example, a contactless communication device having a dielectric such as FeliCa (registered trademark) may be provided in the rotor 2R, and a receiving unit may be provided in the stator 2S, enabling communication with each rotation.

[0049] In the first embodiment, the tertiary battery transmitter 30 transmits a wireless signal at the upper threshold Tup and the lower threshold Tlow, but the present invention is not limited to this and may transmit a wireless signal as a temperature signal at a predetermined temperature, and if the transmitter is configured to transmit a wireless signal as a temperature signal every degree, the temperature of the rotating body can be measured every degree. If the transmitter is configured to transmit a wireless signal as a temperature signal at finer temperature intervals, the temperature of the rotating body can be measured in more detail.

[0050] In the second embodiment, the tertiary battery transmitter 30 transmits a wireless signal when there is a change in the temperature of the rotating body by a predetermined temperature Tst, which is the interval between the upper threshold Tup and the lower threshold Tlow, but if the transmission is configured to transmit the temperature of the rotating body at shorter intervals, the temperature of the rotating body can be measured in more detail by the control unit 10. In other words, the wireless oscillator transmits a wireless signal when the temperature of the rotating body changes by a predetermined temperature in accordance with the charging voltage of the tertiary battery, and the control unit measures the temperature of the rotating body by performing a calculation to add or subtract the temperature of the rotating body by a predetermined temperature based on the wireless signal received by the receiving unit.

[0051] In addition, in the above second embodiment, the control unit 10 determines whether the temperature has risen or fallen when it receives a wireless signal, but the tertiary battery transmitter 30 may be configured to emit a first wireless signal when the temperature of the rotating body rises, and to emit a second wireless signal different from the first wireless signal when the temperature of the rotating body falls. [Explanation of symbols]

[0052] 1...Rotating body temperature measurement system / 2...Motor (rotating electric machine) / 2R...Rotor (rotating body, rotor) / 10...Control unit / 30...Tertiary battery transmitter / 31...Tertiary battery / 32...Wireless transmitter (wireless transmitter unit) / 40...Receiver (receiving unit) / Tup...Upper threshold (first temperature) / Tlow...Lower threshold (second temperature) / V...Charging voltage

Claims

1. A tertiary battery that charges according to temperature changes; a wireless transmitter that transmits a wireless signal in response to a charging voltage of the tertiary battery, A device configured to be mounted on a rotating body, Tertiary battery transmitter.

2. The rotating body is a rotor of a rotating electric machine.

2. The tertiary battery transmitter according to claim 1.

3. The tertiary battery transmitter according to claim 1 ; a receiving unit for receiving a wireless signal transmitted from the wireless transmitting unit; A control unit that determines the temperature of the rotating body based on the wireless signal received by the receiving unit. Rotating body temperature measurement system.

4. the wireless transmission unit transmits the wireless signal when the temperature of the rotating body reaches a first temperature in response to a charging voltage of the tertiary battery and when the temperature of the rotating body reaches a second temperature lower than the first temperature in response to a charging voltage of the tertiary battery; the control unit determines, based on the wireless signal received by the receiving unit, that the temperature of the rotating body is between the first temperature and the second temperature. The rotating body temperature measuring system according to claim 3 .

Images