Measuring system for rotating body

Abstract

To make it possible to perform a measurement of a rotating body under the condition that a damage to a battery caused by a rotation is reduced, and an electromagnetic noise associated with an electric power supply is suppressed without using an electrolyte battery.SOLUTION: A rotating body 200 is provided with a data logger 18, a voltage holding capacitor 14, an electromagnetic electric power supply coil 10, and an optical signal light receiving unit 20, and an electromagnetic coupling coil 28 and an optical signal transmitting unit 34 are provided on the outside of the rotating body 200. Electric power is supplied from the electromagnetic coupling coil 28 to the electromagnetic electric power supply coil 10 in a non-contact manner; the electric power is held in the voltage holding capacitor 14; the electric power stored in the voltage holding capacitor 14 is used to measure and store a state quantity using the data logger 18; and the electric power supply in a non-contact manner from the electromagnetic coupling coil 28 to the electromagnetic electric power supply coil 10 is temporarily suspended by that the electric power supply signal transmitted from the optical signal transmitting unit 34 is detected by the optical signal light receiving unit 20.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a measurement system for a rotating body. [Background technology]

[0002] Currently, ultra-compact data loggers are used to measure characteristics such as rotational speed, torque, stress, temperature, inertial force, and vibration of high-temperature, high-speed rotating objects.

[0003] Patent Document 1 discloses a high-speed, non-contact measurement data communication system that has a fixed module and a rotating shaft module that is attached to a rotating shaft and rotates with the rotation of the rotating shaft, and is wirelessly connected by transmitting and receiving optical signals between the fixed module and the rotating shaft module.

[0004] A measuring device for a quantity to be measured inside a high-speed rotating body is disclosed, which includes a rotating body having a measured quantity-voltage conversion device that converts the measured quantity into a voltage signal, a voltage-frequency conversion circuit that converts the voltage signal into a frequency signal, an electrical-optical conversion circuit that converts an electrical signal into an optical signal and outputs the signal outside the rotating body, and a secondary coil of a rotary transformer that supplies the necessary power to these circuits non-contactly, and a fixed part having a primary coil of the rotary transformer, an optical-electrical conversion circuit that receives an optical signal from the rotating body and converts it into an electrical signal, and a frequency-voltage conversion circuit that converts a frequency signal into a voltage signal (Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2009-282965 A [Patent Document 2] Japanese Patent Publication No. 59-172098 Summary of the Invention [Problem to be solved by the invention]

[0006] In general technology, a sensor attached to a rotating shaft detects and collects parameters such as torque, stress, temperature, inertial force, and vibration of the rotating shaft in real time, and then transmits the detected data (measurement data) to a processor for data analysis. Since the sensor is attached to the rotating shaft that rotates at high speed, the optimal data transmission method from the rotating shaft side to the fixed side is wireless data communication. Power is supplied to the device installed on the rotating shaft via a battery pack or wireless energy.

[0007] However, when an electrolyte battery is used in a battery pack, the battery may be damaged by centrifugal force during high-speed rotation, which may render the data logger unusable.

[0008] Furthermore, when non-contact power supply is used, electromagnetic noise is generated during power supply, which causes a problem of reduced measurement accuracy. [Means for solving the problem]

[0009] One aspect of the present invention is a measurement system that measures a state quantity related to a rotating body, the measurement system comprising: a data logger, a power holding unit, a power receiving unit, and a power supply signal detection unit provided on the rotating body; a power supply unit and a power supply signal transmission unit provided outside the rotating body; power is supplied contactlessly from the power supply unit to the power receiving unit, the power is held in the power holding unit, the state quantity is measured and stored by the data logger using the power held in the power holding unit; and a power supply signal transmitted from the power supply signal transmission unit is detected by the power supply signal detection unit, thereby temporarily suspending the contactless supply of power from the power supply unit to the power receiving unit.

[0010] Here, it is preferable that the state quantity is measured and stored by the data logger during the pause period and during a period of power supply from the power supply unit to the power receiving unit.

[0011] It is also preferable that the power supply signal is an optical signal.

[0012] The power supply signal is preferably a signal obtained by detecting a voltage generated by radio waves or electromagnetic supply for wireless communication.

[0013] It is also preferable that the power supply signal detector is provided on the central axis of rotation of the rotor. Effect of the Invention

[0014] According to the present invention, it is possible to measure a rotating body without disposing an electrolyte battery on the rotating body, while preventing damage to the battery due to rotation and suppressing electromagnetic noise due to power supply. [Brief description of the drawings]

[0015] [Figure 1] 1 is a diagram showing a configuration of a measurement system for a rotating body according to an embodiment of the present invention; [Diagram 2] 1 is a diagram showing a circuit configuration of a measurement system for a rotating body according to an embodiment of the present invention; [Diagram 3] FIG. 11 is a perspective view showing another example of the configuration of the measurement system for a rotating body in an embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing time variations of various signals during intermittent power supply in the embodiment of the present invention. [Diagram 5] FIG. 4 is a diagram showing time variations of various signals during intermittent power supply in the embodiment of the present invention. [Figure 6] 1 is a wiring diagram of a measurement system for a rotating body according to an embodiment of the present invention; [Figure 7] FIG. 4 is a diagram showing a mounting photograph of a voltage hold circuit board according to an embodiment of the present invention. [Figure 8] FIG. 4 is a diagram showing a mounting photograph of a power receiving coil substrate according to an embodiment of the present invention. [Figure 9] FIG. 2 is a diagram showing a mounting photograph of a rotation measuring unit according to an embodiment of the present invention. [Figure 10] FIG. 4 is a diagram showing a mounting photograph of a power transmission coil substrate according to an embodiment of the present invention. [Figure 11]FIG. 13 is a diagram showing a photograph of a power transmitting unit according to an embodiment of the present invention; [Figure 12] FIG. 11 is a diagram showing the results of a desk-based operation check of the measuring system for a rotating body according to an embodiment of the present invention. [Figure 13] FIG. 11 is a diagram showing the results of a desk-based operation check of the measuring system for a rotating body according to an embodiment of the present invention. [Figure 14] FIG. 2 is a diagram showing a mounting photograph of a rotation measuring unit according to an embodiment of the present invention. [Figure 15] FIG. 13 is a diagram showing a photograph of a measurement system installed during a rotation test in an embodiment of the present invention. [Figure 16] 11A and 11B are diagrams showing the results of a rotation test of the measurement system for a rotating body in the embodiment of the present invention. [Figure 17] 11A and 11B are diagrams showing the results of a rotation test of the measurement system for a rotating body in the embodiment of the present invention. [Figure 18] 11A and 11B are diagrams showing the results of a rotation test of the measurement system for a rotating body in the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] 1, a measurement system 100 for a rotating body in an embodiment of the present invention is configured by combining a data logger main body 102 and a power supply unit 104. The data logger main body 102 is attached to a rotating body 200, which is an object to be measured, and measures state quantities of the rotating body 200, such as the rotation speed, torque, stress, temperature, inertial force, and vibration. Power is supplied to the data logger main body 102 from the power supply unit 104 in a non-contact manner, and the data logger main body 102 performs measurements using the power obtained by this power supply.

[0017] 2 shows the configuration of the data logger main body 102 and the power supply unit 104. The data logger main body 102 includes an electromagnetic power supply coil 10, a rectifier bridge 12, a voltage holding capacitor 14, a voltage regulator 16, a data logger 18, an optical signal receiving unit 20, and a sensor 22. The power supply unit 104 includes a power supply switch 24, an electromagnetic power supply driver 26, an electromagnetic coupling coil 28, an optical signal switch 30, a NOT element 32, and an optical signal transmitting unit 34.

[0018] When the power supply unit 104 supplies power to the data logger main body 102, a power supply signal for turning on the power supply switch 24 is input from the outside, and the power supply switch 24 is turned on. This causes an AC current to be supplied from the electromagnetic power supply driver 26 to the electromagnetic coupling coil 28. The electromagnetic coupling coil 28 is electromagnetically coupled to the electromagnetic power supply coil 10 of the data logger main body 102, and an electromotive force is induced in the electromagnetic power supply coil 10 by supplying an AC current to the electromagnetic coupling coil 28. That is, the electromagnetic power supply coil 10 functions as a power receiving unit that electromagnetically receives power, and the electromagnetic coupling coil 28 functions as a power supply unit that electromagnetically supplies power. The AC electromotive force induced in the electromagnetic power supply coil 10 is rectified in the rectifier bridge 12 and supplied to the voltage holding capacitor 14. The voltage holding capacitor 14 functions as a power holding unit that accumulates power according to the applied voltage.

[0019] The data logger main body 102 measures and stores the state quantities of the rotating body 200 using the power stored in the voltage holding capacitor 14. The voltage regulator 16 adjusts the terminal voltage of the voltage holding capacitor 14 to a predetermined voltage and applies it to the power supply terminal of the data logger 18. The data logger 18 receives power from the voltage regulator 16, receives signals from sensors 22 for measuring various state quantities installed on the rotating body 200, and stores the signals as data in its internal memory.

[0020] Here, the data logger main body 102 acquires the state quantity of the rotating body 200 during a period when power is not being supplied from the power supply unit 104. When a power supply signal that turns on the power supply switch 24 is input from the outside to the power supply unit 104, the power supply signal is inverted by the NOT element 32, and a power supply signal that turns off the power supply switch 24 is input to the optical signal transmission unit 34. In this state, the optical signal transmission unit 34 does not transmit an optical signal. On the other hand, when a power supply signal that turns off the power supply switch 24 is input from the outside, the power supply signal is inverted by the NOT element 32, and a power supply signal that turns on the power supply switch 24 is input to the optical signal transmission unit 34. In this state, the optical signal transmission unit 34 transmits an optical signal. In the data logger main body 102, the optical signal transmitted from the optical signal transmission unit 34 is received by the optical signal receiving unit 20. In this way, the optical signal transmission unit 34 functions as a power supply signal transmission unit, and the optical signal receiving unit 20 functions as a power supply signal detection unit. The data logger 18 stores the signal from the sensor 22 as data in an internal memory only during the period when the optical signal is being received by the optical signal receiving unit 20 .

[0021] 1, a data logger main body 102 is disposed at the tip of the rotating shaft of a rotating body 200, and power is supplied from the tip side of the rotating shaft by non-contact electromagnetic coupling. The optical signal receiving unit 20 of the data logger main body 102 is also disposed at the tip of the rotating shaft of the rotating body 200, and an optical signal is intermittently transmitted from the tip side of the rotating shaft by the optical signal transmitting unit 34 of the power supply unit 104, whereby non-contact power supply is intermittently stopped, and data storage by the data logger 18 is performed during that time. Note that data measurement and storage by the data logger 18 may be performed during the power supply period in which non-contact power supply is being performed.

[0022] As shown in FIG. 3, the optical signal receiving unit 20 of the data logger main body 102 may be arranged on the side of the rotation axis of the rotating body 200. In this case, it is preferable to arrange the optical signal transmitting unit 34 of the power supply unit 104 at a position facing the optical signal receiving unit 20 at a predetermined rotation angle (phase angle) when the rotating body 200 rotates. In this arrangement, an optical signal is input to the optical signal receiving unit 20 of the power supply unit 104 every time the rotating body 200 rotates once by constantly outputting an optical signal from the optical signal transmitting unit 34 of the power supply unit 104. For example, the input of an optical signal to the optical signal receiving unit 20 is used as a trigger to store data by the data logger 18 during a predetermined period from the time when the optical signal is input to the optical signal receiving unit 20 until the rotating body 200 rotates once, and non-contact power supply may be performed during the remaining period until the rotating body 200 rotates once.

[0023] The power supply signal may be a radio wave for wireless communication instead of an optical signal. The power supply signal may be generated by detecting a voltage generated by electromagnetic power supply from the electromagnetic power supply driver 26 to the electromagnetic power supply coil 10. That is, the voltage generated by electromagnetic power supply from the electromagnetic power supply driver 26 to the electromagnetic power supply coil 10 may be detected, and the data logger 18 may be controlled depending on whether or not the period during which contactless power supply is being performed is determined based on the detection signal.

[0024] [Study of intermittent non-contact power supply] A simulation circuit of the measurement system 100 for a rotating body shown in FIG. 2 was created, and the results of checking the operation of the intermittent contactless power supply using the simulation circuit will be described below.

[0025] Figure 4 shows the time changes of various signals when a 20 ms power supply pause period was set during a 100 ms measurement cycle for non-contact electromagnetic power supply. During the power supply period, noise was generated due to the power supply coil, and this noise was superimposed on the signal measured by the data logger 18. In contrast, during the power supply pause period, the noise due to the power supply coil was greatly reduced, and the noise in the signal measured by the data logger 18 was also reduced, making it possible to properly measure the change in the physical quantity to be measured.

[0026] Figure 5 shows the change over time in the held voltage of voltage holding capacitor 14 and the output voltage of voltage regulator 16. It was confirmed that if the load current during the period when power supply is suspended is appropriate, as shown in Figure 5(a), the held voltage of voltage holding capacitor 14 is maintained at or above the first reference value (6.5V in the simulated circuit), and the output voltage of voltage regulator 16 can also be maintained at or above the second reference value (5V in the simulated circuit).

[0027] However, if the load current during the power supply suspension period is inappropriate, the voltage held by the voltage holding capacitor 14 and the output voltage of the voltage regulator 16 will not be able to maintain the reference value, as shown in Fig. 5(b). The voltage held by the voltage holding capacitor 14 is also affected by the distance between the electromagnetic power supply coil 10 of the data logger main body 102 and the electromagnetic coupling coil 28 of the power supply unit 104. Therefore, it is preferable to set the distance between the electromagnetic power supply coil 10 and the electromagnetic coupling coil 28 and the power supply suspension period so that the voltage held by the voltage holding capacitor 14 and the output voltage of the voltage regulator 16 can maintain the desired voltage value.

[0028] [Example] Fig. 6 is a diagram showing an example of actual wiring of the data logger main body 102 in the embodiment. The data logger main body 102 is configured to include a data logger unit 110, a voltage holding circuit board 112, and a power receiving board 114. Fig. 7 shows a photograph of the voltage holding circuit board 112 mounted. Fig. 8 shows a photograph of the power receiving board 114 mounted. Fig. 9 shows a photograph of the entire data logger main body 102 mounted.

[0029] The data logger unit 110 receives a sensor signal from the connected sensor 22, and measures and stores the state quantity of the rotating body 200 using the power stored in the voltage holding capacitor 14. In this embodiment, the sensor 22 is a T-type thermocouple. The voltage holding circuit board 112 is provided with an overvoltage protection circuit 36 ​​in addition to the voltage holding capacitor 14 and the voltage regulator 16. The overvoltage protection circuit 36 ​​supplies power to the voltage holding capacitor 14 and the voltage regulator 16 when the voltage output from the power receiving board 114 does not exceed a predetermined overvoltage reference value. The power receiving board 114 is configured such that an electromagnetic power supply coil 10, a rectifier bridge 12, and an optical signal receiving unit 20 are arranged at an end of a cylindrical case 38. The electromagnetic power supply coil 10 is arranged so as to be wound around the end of the cylindrical case 38. The optical signal receiving unit 20 is arranged near the central axis of the end of the cylindrical case 38.

[0030] In the configuration of this embodiment, the data logger unit 110 and the voltage holding circuit board 112 are arranged so that they face each other. The data logger unit 110 and the voltage holding circuit board 112 are housed in the internal space of the cylindrical case 38 of the power receiving board 114. With the data logger unit 110 and the voltage holding circuit board 112 housed in the internal space of the case 38, the power receiving board 114 is attached to the end of the rotating shaft of the rotating body 200 so that the central axis of the rotating shaft and the power receiving board 114 are coaxial.

[0031] Fig. 10 shows a mounting photograph of power transmission coil board 120 constituting power supply section 104. Fig. 11 shows a mounting photograph of power transmission unit 122 constituting power supply section 104.

[0032] The power transmission coil substrate 120 is configured by incorporating the electromagnetic coupling coil 28 and the optical signal transmission unit 34 in a cylindrical case 40. The optical signal transmission unit 34 is an LED element. The electromagnetic coupling coil 28 is disposed at a position where the electromagnetic coupling coil 28 can supply power to the electromagnetic power supply coil 10 when the power transmission coil substrate 120 faces the power receiving substrate 114. The optical signal transmission unit 34 is disposed at a position where the light output from the optical signal transmission unit 34 can be received by the optical signal receiving unit 20 when the power transmission coil substrate 120 faces the power receiving substrate 114. In this embodiment, the optical signal transmission unit 34 is disposed near the central axis of the end of the cylindrical case 40. The power transmission coil substrate 120 is also provided with an external communication antenna 42 for wirelessly receiving measurement data acquired and stored by the data logger unit 110 of the data logger main body 102.

[0033] The power transmission unit 122 is electrically connected to the power transmission coil board 120, and is equipped with the power supply switch 24, the electromagnetic power supply driver 26, the optical signal switch 30, and the NOT element 32 included in the power supply unit 104. The power transmission unit 122 is further provided with a power transmission pulse frequency setting unit 44 and a duty ratio setting unit 46. The power transmission pulse frequency setting unit 44 is used to set the frequency of the power transmission pulse, which is an electromagnetic wave sent from the electromagnetic coupling coil 28. The duty ratio setting unit 46 is used to adjust the duty ratio (=pulse width / period) of the power transmission pulse. The setting can be performed using the ± key below the screen. In this embodiment, the pulse period is 100 msec, and the duty ratio is 80% (i.e., power supply is suspended for 20 msec for a power transmission pulse period of 100 msec).

[0034] With this configuration, operation was confirmed on a desk. An insulating spacer was placed between the electromagnetic coupling coil 28 on the power supply side and the electromagnetic power supply coil 10 on the power receiving side, and the distance between them was set to 3 mm. When the power supply suspension period was set to 20 msec, the output voltage of the voltage regulator 16 was 4.979 V. This confirmed that the voltage holding circuit board 112 was operable. If the distance between the electromagnetic power supply coil 10 on the power receiving side and the electromagnetic coupling coil 28 on the power supply side was within 3 to 4 mm, the output voltage of the voltage regulator 16 could be maintained at 4.9 V or higher if the duty ratio was set to 75% (power supply suspension of 25 msec) or higher. Therefore, it was confirmed that operation and communication were possible under these conditions without providing an electrolyte battery on the data logger main body 102 side.

[0035] Figure 12 shows an example of the output of the thermocouples provided as sensors 22 during a desk-top operation check. The sampling rate (fs) of the temperature channel of the data logger main body 102 was set to the maximum value of 12.5 kHz. The seven thermocouples exposed to the atmosphere were operating normally, as continuous data was obtained even immediately after the power supply interruption signal. However, no difference in the noise effect of the thermocouples before and after the power supply interruption could be confirmed.

[0036] Fig. 13 shows the results of confirming the influence of electromagnetic noise by placing a thermocouple near the electromagnetic power feeding coil 10 on the power receiving side. In Fig. 13, a signal indicating the end of a power feeding pause period is not displayed, so a line indicating the pause period is drawn for convenience. The electromagnetic power feeding coil 10 on the power receiving side became hotter at 35 to 40°C due to heat generation, and the thermocouple placed near the electromagnetic power feeding coil 10 was influenced by electromagnetic noise. However, as in Fig. 12, the difference in the influence of noise during the power feeding period and the power feeding pause period was unclear.

[0037] Next, the measuring system 100 for a rotating body was actually installed on the rotating body 200 and its operation was confirmed.

[0038] 14 is a photograph showing the state of the data logger main body 102 before it is fixed to the rotating body 200. The data logger section 110 and the voltage holding circuit board 112 that constitute the data logger main body 102 are housed in the case 38 of the power receiving board 114. In addition, three of the seven sensors 22 (thermocouples) are disposed outside the case 38, and the remaining four are disposed inside the case 38.

[0039] 15 is a photograph showing the state in which the measuring system 100 for a rotating body is attached to the rotating body 200. The case 38 of the data logger main body 102 was fixed to the tip of the rotating shaft of the rotating body 200 so as to be rotatable together with the rotating body 200. The power supply unit 104 was arranged so that the electromagnetic power supply coil 10 of the data logger main body 102 and the electromagnetic coupling coil 28 of the power supply unit 104 were aligned and faced each other. The gap between the electromagnetic coupling coil 28 on the power supply side and the electromagnetic power supply coil 10 on the power receiving side was set to 3 mm. Three of the seven thermocouples provided as sensors 22 in the data logger main body 102 were placed in the connection adapter outside the case 38.

[0040] During the rotation test, the rotor 200 was rotated at 2500 rpm, and the hot junctions of the three thermocouples were heated by applying hot air from a heat gun at random. The intermittent power supply pulse setting was a power supply period of 100 msec, with a power supply rest period of 20 msec. The sampling frequency fs of the data of the data logger 18 was 5 Hz to a maximum of 12.5 kHz.

[0041] FIG. 16 shows the results of actually installing the measuring system 100 for a rotating body on a rotating body 200 and checking the operation. FIG. 16 shows the results of sampling when the rotation speed of the rotating body 200 is 2500 rpm and the sampling frequency fs of the data of the data logger 18 is 5 Hz. Data could be continuously acquired from the three sensors 22 (thermocouples) that heated the outside of the case 38 and the four sensors 22 (thermocouples) that measured the temperature inside the case 38. In other words, while the rotating body 200 was rotating, data could be normally acquired by the data logger 18 without providing an electrolyte battery in the data logger main body 102. It should be noted that from this result, the influence of noise on the sensor 22 during the power supply stop in the intermittent power supply could not be confirmed.

[0042] FIG. 17 shows the result of sampling when the rotation speed of the rotor 200 is 2500 rpm and the sampling frequency fs of the data logger 18 is increased to 12.5 Hz. FIG. 18 shows the result of enlarging a part of FIG. 17. FIG. 18 shows the details of the output of the three sensors 22 (thermocouples) heated outside the case 38. In this case, data was continuously acquired from the three sensors 22 (thermocouples) heated outside the case 38 and the four sensors 22 (thermocouples) measuring the temperature inside the case 38. This confirmed the reduction in noise in the output of the sensor 22 during the power supply suspension period. In other words, it was confirmed that the noise in the output signal of the sensor 22 from the rising edge of the power supply suspension signal to the end of the suspension was slightly reduced compared to when power was being supplied.

[0043] As described above, according to the rotating body measurement system 100 of this embodiment, it is possible to measure the state quantity of the rotating body 200 in a state where electromagnetic noise associated with power supply is suppressed, without providing an electrolyte battery in the data logger main body 102. In addition, it is not necessary to provide an electrolyte battery in the data logger main body 102 that rotates together with the rotating body 200, and damage to the electrolyte battery can be prevented.

[0044] [Configuration of the present invention] [Configuration 1] A measurement system for measuring a state quantity related to a rotating body, comprising: The rotating body is provided with a data logger, a power holding unit, a power receiving unit, and a power supply signal detection unit, a power supply unit and a power supply signal transmission unit are provided outside the rotating body, supplying power from the power supply unit to the power receiving unit in a non-contact manner, storing the power in the power storage unit, and measuring and storing the state quantity by the data logger using the power stored in the power storage unit; a power supply signal detection unit detecting a power supply signal transmitted from the power supply signal transmission unit, thereby temporarily suspending non-contact power supply from the power supply unit to the power receiving unit. [Configuration 2] The measurement system according to configuration 1, The measurement system is characterized in that the state quantity is measured and stored by the data logger during the pause period and during a period of power supply from the power supply unit to the power receiving unit. [Configuration 3] The measurement system according to configuration 1 or 2, The measurement system according to claim 1, wherein the power supply signal is an optical signal. [Configuration 4] The measurement system according to configuration 1 or 2, A measurement system characterized in that the power supply signal is a signal obtained by detecting a voltage generated by radio waves or electromagnetic supply in wireless communication. [Configuration 5] The measurement system according to any one of configurations 1 to 4, The measurement system is characterized in that the power supply signal detection unit is provided on a central axis of rotation of the rotating body. [Explanation of symbols]

[0045] 10 electromagnetic power supply coil, 12 rectifier bridge, 14 voltage holding capacitor, 16 voltage regulator, 18 data logger, 20 optical signal receiving unit, 22 sensor, 24 power supply switch, 26 electromagnetic power supply driver, 28 electromagnetic coupling coil, 30 optical signal switch, 32 NOT element, 34 optical signal transmitting unit, 36 overvoltage protection circuit, 38 case, 40 case, 42 external communication antenna, 44 power transmission pulse frequency setting unit, 46 duty ratio setting unit, 100 measurement system, 102 data logger main body, 104 power supply unit, 110 data logger unit, 112 voltage holding circuit board, 114 power receiving board, 120 power transmission coil board, 122 power transmission unit, 200 rotating body.

Claims

1. A measurement system for measuring a state quantity related to a rotating body, comprising: The rotating body is provided with a data logger, a power holding unit, a power receiving unit, and a power supply signal detection unit, a power supply unit and a power supply signal transmission unit are provided outside the rotating body, supplying power from the power supply unit to the power receiving unit in a non-contact manner, storing the power in the power storage unit, and measuring and storing the state quantity by the data logger using the power stored in the power storage unit; a power supply signal detection unit detecting a power supply signal transmitted from the power supply signal transmission unit, thereby temporarily suspending non-contact power supply from the power supply unit to the power receiving unit.

2. 2. The measurement system of claim 1, The measurement system is characterized in that the state quantity is measured and stored by the data logger during the pause period and during a period of power supply from the power supply unit to the power receiving unit.

3. 3. The measurement system according to claim 1, The measurement system according to claim 1, wherein the power supply signal is an optical signal.

4. 3. The measurement system according to claim 1, A measurement system characterized in that the power supply signal is a signal obtained by detecting a voltage generated by radio waves or electromagnetic supply in wireless communication.

5. 3. The measurement system according to claim 1, The measurement system is characterized in that the power supply signal detection unit is provided on a central axis of rotation of the rotating body.

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