JP2003022492A - Wireless sensor, bearing device with sensor, and self- acting device with sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless sensor which is equipped with a power unit capable of supplying stable electric power and outputs a detected signal by radio. SOLUTION: The wireless sensor is equipped with a detection part 11 which detects an object to be detected, a control part 12 which processes the detection signal of the detection part 11, and a transmission device (transmission part) 13 which is controlled by the control part 12 and sends its output with a radio wave (radio) R, and a power unit 14 which supplies electric power to them. The power unit 14 is equipped with a solar battery (photoelectric conversion body) as a power generator and a secondary battery 16 as a storage part which accumulates and discharges electricity generated by the solar battery 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless sensor which is incorporated in a relative moving part such as a bearing or a linear motion device used in machine tools, industrial machines, vehicles, etc., detects a detection target, and outputs it wirelessly.

[0002]

2. Description of the Related Art A bearing that supports a rotating shaft, which is an axle of a vehicle such as an automobile or a railroad vehicle, and a linear motion device such as a ball screw or a linear guide, which is applied to an industrial machine such as a processing machine or an assembly device, and a bearing are Cause vibration,
It generates heat due to friction. These vibrations and temperatures affect the life of bearings and linear motion devices. Therefore, especially for bearings and linear motion devices that are attached to parts that are difficult to inspect, such as the inside of the device, separately prepare a general-purpose vibration sensor or temperature sensor in advance, and use it as a target part as necessary. It is attached to and outputs the detection signal through a signal line. When the vibration sensor or the temperature sensor requires electric power, electric power is supplied by a power supply line.

The present inventor has attempted to provide a wireless sensor on the rolling bearing, supply electric power to the sensor by a primary battery, and transmit a detection signal by radio waves.

[0004]

When the detection signal is output through the signal line, a stable output signal can be obtained. When power is supplied by the power supply line, stable power supply can be obtained. Also,
The signal line and the power supply line are usually used as a multi-core cable (hereinafter abbreviated as a cable) bundled into one. However, the cabled sensor cannot be mounted directly on the rotating side of the bearing. Further, when the sensor to which the cable is connected is attached to the movable body of the linear motion device, the cable may be repeatedly bent and broken.

The wireless sensor reduces electric power consumption by outputting radio waves when a preset threshold value is exceeded, and can be used for a relatively long period of time by including a primary battery. However, since the vibration exceeding the threshold value is output for a long time and the electric power is consumed, the primary battery must be replaced eventually.

In addition, a stable power supply is required to continuously detect the object to be detected. Bearings installed at locations where a stable rotation speed is obtained, such as the rotating shaft of a power source, are equipped with a face-to-face generator to supply stable power to the sensor, but industrial machinery such as processing machines and assembly equipment The bearing or the linear motion device such as a ball screw or a linear guide provided in the above has a speed that fluctuates or moves intermittently, so that it is difficult to supply stable power.

Therefore, an object of the present invention is to provide a wireless sensor which includes a power supply device capable of supplying stable power and which outputs a detected signal by radio.

[0008]

A wireless sensor according to the present invention includes a detection section for detecting a detection target, a control section for processing a detection signal of the detection section, and a control unit for controlling the output to output wirelessly. A transmission unit that transmits, a detection unit, the control unit, and a power supply device that supplies power to the transmission unit,
The power supply device includes a power generator and a power storage unit that stores and discharges electricity generated by the power generator.

Alternatively, the wireless sensor according to the present invention includes a detection unit that detects a detection target, a control unit that processes a detection signal of the detection unit, and a transmission unit that is controlled by the control unit and wirelessly transmits an output. And a power supply device that supplies power to the detection unit, the control unit, and the transmission unit, and the power supply device stores a power generator and discharges electricity generated by the power generator and discharges the electricity. And a primary battery, and the control unit connects at least one of the power storage unit and the primary battery to the detection unit, the control unit, and the transmission unit.

As a preferred embodiment of the present invention, the power supply device includes, as a generator, a photoelectric conversion body, a coil, and a magnetic flux changing means for changing the magnetic flux passing through the coil, or a thermoelectric generator. Further, a charging circuit for controlling storage and discharge of the storage unit may be provided. If the magnetic flux changing means is a multi-pole magnet in which N poles and S poles are alternately arranged in the direction of relative movement with the coil, the configuration of the generator can be simplified.

A bearing device with a sensor or a linear motion device with a sensor according to the present invention includes the wireless sensor of the present invention.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A wireless sensor 1 according to a first embodiment of the present invention will be described with reference to FIGS. The slide table 2 shown in FIG. 1 includes a ball screw 3. Both ends of the screw shaft 4 of the ball screw 3 are rotatably supported by bearings 6 fixed to a base 5. A motor 7 serving as a drive unit is connected to one end of the screw shaft 4 by a coupling 8. The table 9 is fixed to the nut 10 of the ball screw 3 and moves smoothly in the axial direction when the screw shaft 4 rotates.

A wireless sensor 1 is attached to the nut 10. The wireless sensor 1 includes a detection unit 1 that detects vibration of a ball screw 3 that is an example of a detection target.
1, a control unit 12 that processes a signal detected by the detection unit 11, and a transmission device 13 as a transmission unit that is controlled by the control unit 12 based on the result and wirelessly outputs a radio wave R.
It has and.

Further, as shown in the block diagram of FIG. 2, the wireless sensor 1 is provided with a power supply device 14 for supplying electric power to each of the detection unit 11, the control unit 12, and the transmission device 13. The power supply device 14 includes a photoelectric conversion body that is a generator, for example, a solar cell 15 and a secondary battery 16 that is a power storage unit.
It has and. Between the solar cell 15 and the secondary battery 16, a charging circuit 17 having a diode provided so that the electricity accumulated in the secondary battery 16 does not flow backward and a function of preventing overcharge of the secondary battery 16 are provided. ing. The thick solid line in FIG. 2 indicates the power supply path, and the thin solid line indicates the signal path.

When the wireless sensor 1 is exposed to light, it is generated by the solar cell 15, power is supplied to the detection section 11, the control section 12 and the transmitter 13, and the surplus is stored in the secondary battery 16. Then, when the capacity of the secondary battery 16 becomes full, the charging circuit 17 prevents overcharging. Further, when the light hitting the wireless sensor 1 is weakened and the output of the solar cell 15 is reduced, the electric power stored in the secondary battery 16 is discharged and the electric power is supplied to the detection unit 11, the control unit 12, and the transmitter 13. Since the solar cell 15 is used as the power generator, when the amount of light is insufficient and the power is insufficient, it is possible to easily compensate by irradiating light from the outside.

As described above, since the power supply device 14 of the wireless sensor 1 is provided with the solar battery 15 which is a generator,
No need to replace parts due to dead batteries. Further, since the power supply device 14 includes the solar battery 15 and the secondary battery 16, it is possible to supply stable power to the detection unit 11, the control unit 12, and the transmission device 13 even if the amount of light that hits the nut 10 changes to some extent. You can

Next, a wireless sensor 21 according to a second embodiment of the present invention will be described with reference to FIGS. 3 and 4. In the bearing 22 shown in FIG. 3, the outer ring 23 is a housing 24.
The inner ring 25 is fitted in the middle of the rotating shaft 26. A recess 28 is provided in a part of the end 27 of the outer ring 23, and the wireless sensor 21 is attached to the recess 28.

As shown in the block diagram of FIG. 4, the wireless sensor 21 includes a detection unit 29 for detecting a temperature which is an example of a detection target, and a control unit 30 for processing a signal detected by the detection unit 29. Based on the result, the control unit 3
It is provided with a transmission device 31 as a transmission unit which is controlled to 0 and wirelessly outputs a sound, for example, an ultrasonic wave W. The wireless sensor 21 also includes a power supply device 32 that supplies electric power to each of the detection unit 29, the control unit 30, and the transmission device 31. The power supply device 32 includes a generator 33 that generates electricity by a change in magnetic flux (induced electromotive force) according to the principle of electromagnetic induction, and a secondary battery 34 that is a power storage unit that temporarily stores the generated electricity.
And a charging circuit 35. This charging circuit 35
The power generated by the generator 33 is converted into direct current so that the secondary battery 34 can be charged, and a function of preventing overcharge of the secondary battery 34 is provided. The thick solid line in FIG. 4 indicates the power supply path, and the thin solid line indicates the signal path.

The generator 33 includes an electromotive portion 36 fixed to the outer ring 23 of the bearing 22 and a gear 37 fixed to the inner ring 25 which is a derivative thereof. In addition, this gear 3
7 may be provided integrally with the inner ring 25. Also,
When attaching the wireless sensor 21 to the inner ring 25,
The electromotive section 36 is attached to the inner ring 25, and the gear 37 is attached to the outer ring 23. The gear 37 may be a gear provided as a part of the apparatus or a gear provided exclusively. The electromotive section 36 includes a pole piece 39 arranged in the radial direction of the gear 37 and a pole piece 39.
It has a coil 40 wound around and a magnet 41 attached to the opposite side of the gear 37 via a pole piece 39. The pole piece 39 is a member that induces a magnetic flux,
For example, a member containing iron as a main component, preferably a rod-shaped part made of a ferromagnetic material may be used. The gear 37, the pole piece 39, and the magnet 41 are an example of magnetic flux changing means that changes the magnetic flux passing through the coil 40.

Therefore, when the rotary shaft 26 rotates, the gear 37
The magnetic flux passing through the pole piece 39 changes as the tooth surface 37a of the pole piece approaches or moves away from the pole piece 39, and an induced electromotive force is generated in the coil 40 wound around the pole piece 39 to generate electricity. Since the electricity generated by the induced electromotive force is usually alternating current, it is converted into direct current by the charging circuit 35 and then supplied to the detection unit 29, the control unit 30, and the transmission device 31, and is stored in the secondary battery 34.

The electricity stored in the secondary battery 34 is discharged when the rotation speed of the rotating shaft 26 becomes slow and the output of the generator 33 becomes insufficient, or when the generator 33 is stopped and power is not being generated. Electric power is supplied to 29, the control unit 30, and the transmission device 31.

As described above, by providing the power source device 32 with the induction excitation type generator 33, it is possible to supply power to the wireless sensor 21 without providing a primary battery. Further, since the secondary battery 34 is provided, stable power can be supplied without interruption even when the rotation speed of the rotating shaft 26 is reduced or stopped.

Next, a wireless sensor 51 according to a third embodiment of the present invention will be described with reference to FIGS. The vibration device 52 shown in FIG. 5 includes a linear guide 53 and a hydraulic cylinder 54. The hydraulic cylinder 54 is connected to a table 56 mounted on a bearing 55 of the linear guide 53, and the piston 57 expands and contracts to reciprocate the table 56 along the linear guide 53.

The table 56 includes a wireless sensor 51.
Is attached. This wireless sensor 51
In order to measure the change in acceleration acting on the test body 58 placed on the table 56, a detection unit 59 that detects pressure or strain, which is an example of a detection target, is provided. Further, as shown in the block diagram of FIG.
9. A control unit 60 for processing the signal detected in 9, and based on the result, is controlled by the control unit 60 to emit light such as infrared rays P.
It includes a transmitter 61 as a transmitter for wirelessly outputting, a detector 59, a controller 60, a power supply 62 for supplying electric power to the transmitter 61, and a primary battery 63. Power supply 62
Includes a thermoelectric generator 64 that is a generator, a secondary battery 65 that is a power storage unit that temporarily stores generated electricity, and a charging circuit 66. The thermoelectric generator 64 is a device that directly generates electric power due to a temperature difference, that is, a so-called Seebeck effect. The charging circuit 66 has a diode that prevents a reverse flow of electricity stored in the secondary battery 65 and a function of preventing overcharge of the secondary battery 65. In addition, the control unit 60
In order to know the amount of electric power stored in the secondary battery 65, the voltage of the secondary battery 65 is detected by the signal line 69. In addition,
The thick solid line in FIG. 6 indicates the power supply path, and the thin solid line indicates the signal path.

The power supply device 62 and the primary battery 63 are provided in parallel, and the connection to the load side is switched by the first switch 67 and the second switch 68 controlled by the control unit 60. When the thermoelectric generator 64 can supply sufficient electric power, the first switch 67 is closed and the second switch 68 is opened to connect the detection unit 59 as a load, the control unit 60, and the transmitter 61. While supplying electric power, surplus electric power is stored in the secondary battery 65. The electromotive force of the thermoelectric generator 64 may fluctuate due to changes in the temperature of the outside air and the load on the power consumption side, but stable electricity is supplied by discharging the electricity stored in the secondary battery 65.

If the temperature difference generated in the thermoelectric generator 64 is small, or if the power consumption is large and the power supply 62 is insufficient, the first switch 67 and the second switch 68 are both closed. Then, the primary battery 63 compensates for the power shortage. Further, when there is almost no temperature difference generated in the thermoelectric generator 64 and sufficient electric power cannot be obtained, the second switch 68 is closed and then the first switch 67 is opened to open the primary battery 63. Powered by.

Therefore, when the power supply device 62 supplies sufficient power to the detection unit 59, the control unit 60, and the transmission device 61, the second switch 68 is in the open state.
Power consumption of the primary battery 63 is suppressed and the life of the primary battery 63 is extended. Further, since the primary battery having a small battery capacity can be used, the wireless sensor 51 can be further downsized.

As described above, the thermoelectric generator 64 and the secondary battery 6
By using the power supply device 62 equipped with 5 together with the primary battery 63, more stable power can be supplied to the detection unit 59, the control unit 60, and the transmission device 61. Although both the first switch 67 and the second switch 68 are shown in the closed state in FIG. 6, they are so-called b-contact switches that are excited by the control unit 60 to be in the open state. In order to always supply electric power to the section 60, the first switch 67 and / or the second switch 68 are opened / closed so that they are always closed. In addition, the first switch 67 and the second switch 6
8 is not only mechanical contact point but also transistor and FE
It may be a semiconductor switch such as T (Field Effect Transistor).

In the first to third embodiments, the description has been given by applying the wireless sensors 1, 21, 51 to the ball screw 3, the bearing 22, and the vibration device 52, respectively, but it is applied to the vibration device 52. The wireless sensor 1, 21, 51 may be attached to a linear motion device such as the linear guide 53 and used.

In addition, in the first to third embodiments, the ball screw 3, the bearing 22, or the vibration device 52 is used.
When the rotation and movement are repeated intermittently, the rotary motion or swing motion of the weight (inertial body) is amplified by the gear in the power generation unit of the power supply device 14, 32, 62 of the wireless sensor 1, 21, 51. You may use what is called a kinetic energy conversion type generator which rotates an electric power generation rotor and produces induced electromotive force in a coil.

The generator of the first embodiment is the solar cell 15, the generator of the second embodiment is the electromagnetic induction generator 33, and the generator of the third embodiment is the thermoelectric generator 64. Since it is one mode for carrying out the present invention, a solar cell, a generator by electromagnetic induction, a thermoelectric generator, a kinetic energy conversion type generator may be used alone or in combination depending on the usage of the wireless sensor. Further, it may be provided in combination with the primary battery. In addition, the power storage unit is a secondary battery 16, 34, 6
However, it may be replaced with a capacitor.

The detection unit 11 of the first embodiment detects vibration, the detection unit 29 of the second embodiment detects temperature, and the detection unit 59 of the third embodiment detects pressure or strain.
Since it is one mode for carrying out the present invention, each of the detection units 11, 29, and 59 vibrates according to the purpose of use,
They may be provided alone or in combination so that temperature, pressure, strain, humidity, speed, angle, etc. can be detected.

Further, the transmitter of the first embodiment uses the radio wave R
In the transmitting device 13 which wirelessly outputs in the above, the transmitting unit of the second embodiment wirelessly outputs the ultrasonic waves W, and the transmitting unit in the third embodiment uses the transmitting device 61 wirelessly outputs the infrared rays P. The transmitter 3 that outputs the ultrasonic wave W from the transmitter of the wireless sensor 1 may be used as long as it is a transmitter that corresponds to the usage status of the wireless sensor and the condition of the side receiving the output.
1 or infrared transmitter P may be used as the transmitter device 61. The transmitter device of the wireless sensor 21 may be the transmitter device 13 that outputs the radio wave R or the transmitter device 61 that outputs the infrared light P, or the wireless device. The transmitter of the sensor 51 may be the transmitter that outputs the radio wave R or the transmitter 31 that outputs the ultrasonic wave W.

Further, as described above, the wireless sensors 1,
Since the detection targets 21 and 51 wirelessly output the detection target, they can be applied to the stationary side of the bearing where it is difficult to extract the signal by wire.

A wireless sensor 71 according to a fourth embodiment of the present invention will be described with reference to FIGS.
The wireless sensors 1 of the first to third embodiments are
The same components as 21, 51 are assigned the same reference numerals and explanations thereof are omitted.

The wireless sensor 71 shown in FIG.
The detection unit 11, the control unit 12, the transmission device 13, the secondary battery 16 of the power supply device 14, and the charging circuit 17 shown in the block diagram of FIG. 73 is formed on the outer surface of the sensor case 72. The solar cell 15
Any area may be used as long as it can supply sufficient power to the detection unit 11, the control unit 12, and the transmission device 13. Specifically, as shown in FIG. 7A, for example, it may be mounted on a surface (upper surface) 72t opposite to the installation surface in contact with the mounting portion of the housing H accommodating the bearing whose detection target is measured, It may be attached to a surface (side surface) 72s rising from the installation surface as shown in FIG. 7B, or may be attached to all surfaces 72t and 72s except the installation surface as shown in FIG. 7C. Alternatively, they may be partially attached to a range exposed to light. At this time, the solar cell 15 is attached to each surface by adhesion or screwing. The antenna 73 penetrates the sensor case 72 and the transmitter 1
Connected to 3. It should be noted that the antenna 73 may be of a form that can suitably output the radio wave R, and thus a loop-shaped or planar antenna may be used in addition to the rod-shaped antenna 73 shown in FIG. You may change according to the surrounding environment in which the sensor 71 was installed. It may be something other than a rod-shaped member attached to the side surface 72s. The shape of the installation surface of the wireless sensor 71 is flat in FIG. 7, but it is preferable to make it according to the shape of the mounting portion of the housing H. In addition, as for the method of attachment to the housing H, in addition to fixing with screws as shown in FIG.
When the mounting portion of the housing H is a ferromagnetic material, a magnet may be attached to the installation surface and the wireless sensor 71 may be fixed to the object to be measured by the attracting force of the magnet, or may be attached with an adhesive. Good. The shape of the sensor case is shown in FIG.
The shape is not limited to the box shape shown in FIG. 2, but may be a cylindrical shape, a hemispherical dome shape, or the like. In this case, the solar cell is mounted in a range where the sensor case is exposed to light.

The wireless sensor 71 configured as described above charges the secondary battery 16 with the surplus power of the power generated by the solar battery 15 by the charging circuit 17. Then, when the amount of light decreases, the electric power stored in the secondary battery 16 is discharged to supplement the electric power generated by the solar cell 15. Therefore, the wireless sensor 71 can be used not only in the environment where the solar cell 15 can always obtain a necessary and sufficient amount of light, but also when the amount of light decreases and the power generated by the solar cell 15 decreases. By supplementing the power from the above, stable power can be supplied to the detection unit 11, the control unit 12, and the transmission device 13. Further, since the wireless sensor 71 includes the transmission device 13 and the power supply device 14, there is no electric wire for supplying power and an output wire for a signal detected by the detection unit. Therefore, as the detection unit 11, vibration, temperature, moving speed, rotation angle, pressure, which are examples of detection targets,
By incorporating the necessary ones of the sensor units that detect strain, humidity, etc. in the sensor case 72, the desired detection target can be detected by simply attaching the wireless sensor 71 to the measurement target, and its output signal can be obtained. You can

For signal propagation, as described in the first to third embodiments, radio waves, light including infrared rays, sound waves including ultrasonic waves, etc. can be used. At this time, radio waves and light are suitable in an environment in which direct sight can be obtained, and radio waves are suitable in an environment in which there is no obstacle that cannot be directly seen through. In addition, sound waves can be used with or without obstacles, so in addition to sending signals in the atmosphere, they also send signals through metal structures such as mechanical devices and in fluids such as water. You can send a signal at.

When a plurality of wireless sensors 71 are used at the same time, the wireless sensors 71 together with the detected signals are used.
The identification information assigned to each is transmitted. As described above, by simultaneously managing the plurality of wireless sensors 71, it is possible to comprehensively monitor the operating states of the mechanical device and the like.

A fifth embodiment according to the present invention will be described with reference to FIGS. 8 to 10. The first to the fourth
The same configurations as those of the embodiment are given the same reference numerals and the description thereof will be omitted. As shown in FIG. 8, the wireless sensor 81 is built in a linear guide 82 which is an example of a linear motion device. The linear guide 82 includes a rail 83 and a bearing 84 that moves along the rail 83. The rail 83 is along the direction in which the rail 83 extends,
A rail groove 83a is formed on the side surface. Bearing 8
4 is provided with a track groove 84a facing the rail groove 83a. Between the rail 83 and the bearing 84,
A large number of rolling elements 85 rolling on the rail groove 83a and the track groove 84a are loaded. The rolling element 85 is a bearing 84.
It circulates through a circulation path 86 provided in the.

As shown in the block diagram of FIG. 9, the wireless sensor 81 includes a detector 11, a controller 12, and a transmitter 13.
And a power supply device 14. The transmitting device 14 includes an antenna 87 that outputs a radio wave R, and transmits from the antenna 87 a signal detected by the detection unit 11 or information obtained by processing this signal by the control unit 12. The power supply device 14 includes a generator 88, a charging circuit 17, and a secondary battery 16.
The generator 88 includes a coil 89 and a pole piece 9 shown in FIG.
0 and a multi-pole magnet 91. The coil 89 is fixed to the bearing 84. The pole piece 90 is the coil 8
The magnetic field lines from the multi-pole magnet 91 are guided to the coil 89. The multi-pole magnet 91 is attached to the upper surface 83b of the rail 83, and has N poles 91n and S poles 91s alternately magnetized along the direction in which the rail 83 extends. As the multi-pole magnet 91, a rare earth magnet, a ferrite magnet or the like is used. The pole piece 90 and the multi-pole magnet 91 are an example of magnetic flux changing means for changing the magnetic flux of the coil 89. The multi-pole magnet 91 is the multi-pole magnet 93 shown in FIG.
The magnetization pattern may be

When the coil 89 and the pole piece 90 move together with the bearing 84 along the rail 83, the N pole 9
The direction of the magnetic flux passing through the coil 89 is reversed every time the 1n and the S pole 91s are alternately passed. As a result, an alternating induction current is generated in the coil 89. Further, when the movement of the bearing 84 is irregular, the generated electric power is unstable. Therefore, the charging circuit 17 converts the induced current into a direct current, supplies the direct current to the detection unit 11, the control unit 12, and the transmission device 13, and charges the secondary battery 16 with the surplus power. Secondary battery 16
The electric power stored in is supplied to the detection unit 11, the control unit 12, and the transmission device 13 in a state where the voltage fluctuation is small.

The generator 88 may be the coil 92 and the multi-pole magnet 93 shown in FIG. Further, when the back yoke 94 is attached to the bearing 84 which is located opposite to the multipole magnet 93 with the coil 92 interposed therebetween, the magnetic lines of force of the multipole magnet 93 are effectively induced, and the induced current generated in the coil 92 becomes large. It's good. N pole 93n and S pole 93 of the multi-pole magnet 93
If the magnetic pole pitch widths m of s are made uniform and the winding width c of the coil 92 is made equal to or smaller than the magnetic pole pitch width m of the multi-pole magnet 93, preferably the same, the induced current can be efficiently generated. The multipole magnet 93 shown in FIG. 10 may have the same magnetization pattern as that of the multipole magnet 91 shown in FIG. 8, but the magnetization pattern of the multipole magnet 93 shown in FIG. 10 is better than that of the multipole magnet 91 shown in FIG. Is preferable because the magnetic flux can be effectively used.

In FIG. 8 or FIG. 10, when the power generation amount of one coil 89, 92 is less than the power consumption of the wireless sensor 81, a plurality of coils 89, 92 are provided. The plurality of coils 89 and 92 can be connected in parallel to increase the current, and connected in series to increase the voltage. When a plurality of coils 89 and pole pieces 90 shown in FIG. 8 are provided, one end of the pole piece 90 may be integrally connected and the other end may be a comb tooth-shaped pole piece with the multipole magnet 91 facing the pole piece 90. In this case, the pitch of the comb teeth is the multipole magnet 91.
The magnetic pole pitch width m may be the same, and the winding directions of the adjacent coils 89 may be opposite.

In the wireless sensors 1, 21, 51, 71, 81 shown in the first to fifth embodiments, when signals are transmitted from the transmitters 13, 31, 61, mobile communication means such as mobile phones, PHS (Personal Handyphon)
e System), public telephone lines such as satellite phones may be used. By doing this, the wireless sensors 1, 21, 5
It becomes easy to receive signals even in a place far away from the wireless sensors 1, 71, 81.
One can be centrally managed in one place. When the signal is output by the radio wave R, the signal may be directly transmitted from the transmitting device to the public line, or may be transmitted once to a repeater such as a receiving device arranged near the transmitting device 13,
You may make it transmit to a public line from there. Also,
When the signal is output by infrared ray P or ultrasonic wave W, the signal is
It transmits to the public line from there via a repeater such as a receiving device once located nearby.

[0046]

EFFECTS OF THE INVENTION By supplying electric power to a detection unit, a control unit, and a transmission unit in a power generator having a generator and a power storage unit, a wireless sensor that can supply electric power stably with less frequency of parts replacement. can do.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which a wireless sensor according to a first embodiment of the present invention is attached to a ball screw.

FIG. 2 is a block diagram of the wireless sensor of FIG.

FIG. 3 is a sectional view showing a state in which a wireless sensor according to a second embodiment of the present invention is attached to a bearing.

FIG. 4 is a block diagram of the wireless sensor of FIG.

FIG. 5 is a side view showing a state in which a wireless sensor according to a third embodiment of the present invention is attached to a vibrating device.

6 is a block diagram of the wireless sensor of FIG.

FIG. 7A is a perspective view showing a state in which a solar cell of the wireless sensor according to the fourth embodiment of the present invention is attached to an upper surface of a sensor case. FIG. 6B is a perspective view showing a state in which the solar cell is attached to the side surface of the sensor case. (C) is
The perspective view which shows the state which attached the solar cell to all the surfaces other than the installation surface.

FIG. 8 is a perspective view showing a state where a wireless sensor of a fourth embodiment of the present invention is attached to a linear guide with a part of the bearing cut away.

9 is a block diagram of the wireless sensor of FIG.

10 is a perspective view showing another example of the power generation unit of the wireless sensor of FIG.

[Explanation of symbols]

1, 21, 51, 71, 81 ... Wireless sensor 11, 29, 59 ... Detection unit 12, 30, 60 ... Control unit 13, 31, 61 ... Transmitting device (transmitting unit) 14, 32, 62 ... Power supply device 15 ... Solar cell (generator) 16, 34, 65 ... Secondary battery (power storage unit) 17, 35, 66 ... Charging circuit 33,88 ... Generator 37 ... Gear (flux variation means) 39, 90 ... Pole piece (flux variation means) 40, 89, 92 ... Coil 41 ... Magnet (flux variation means) 63 ... Primary battery 64 ... Thermoelectric generator (generator) 91, 93 ... Multi-pole magnet (flux variation means) 91n, 93n ... N pole 91s, 93s ... S pole 94 ... Back yoke (flux variation means) R ... radio wave W ... Ultrasonic wave (wireless) P ... Infrared (wireless)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G08C 23/02 G08C 23/00 A 23/04 C F term (reference) 2F073 AA32 AA35 AB12 BB02 BC02 BC04 BC05 CC01 EE12 FF02 GG01 GG04 3J101 AA01 AA62 AA64 FA21 FA22 FA24 FA26 3J104 AA03 AA23 AA34 AA64 AA72 DA20 EA01 EA04

Claims (8)

[Claims] 1. A detection unit that detects a detection target, a control unit that processes a detection signal of the detection unit, a transmission unit that is controlled by the control unit and wirelessly transmits an output, the detection unit, and the control unit. And a power supply device that supplies electric power to the transmitting unit, the power supply device including a power generator and a power storage unit that stores and discharges electricity generated by the power generator. Wireless sensor. 2. A detection unit for detecting a detection target, a control unit for processing a detection signal of the detection unit, a transmission unit controlled by the control unit to wirelessly transmit an output, the detection unit and the control unit. And a power supply device that supplies power to the transmission unit, the power supply device includes a generator, a power storage unit that stores and discharges electricity generated by the generator, and a primary battery, The wireless device, wherein the control unit connects at least one of the power storage unit and the primary battery to the detection unit, the control unit, and the transmission unit, and causes the power supply device to supply power. Sensor. 3. The power supply device according to claim 1, wherein the power supply device includes a photoelectric conversion body as a power generator, and a charging circuit that controls storage and discharge of the storage unit. Wireless sensor. 4. The power supply device includes a coil as a generator,
The wireless sensor according to claim 1 or 2, further comprising: a magnetic flux changing unit that changes a magnetic flux passing through the coil, and a charging circuit that controls storage and discharge of the storage unit. 5. The wireless device according to claim 1, wherein the power supply device includes a thermoelectric generator as a generator, and a charging circuit that controls storage and discharge of the storage unit. Sensor. 6. The wireless device according to claim 4, wherein the magnetic flux changing means is a multi-pole magnet in which N poles and S poles are alternately arranged in a direction of moving relative to the coil. Sensor. 7. A bearing device with a sensor, comprising the wireless sensor according to any one of claims 1 to 6. 8. A linear motion device with a sensor, comprising the wireless sensor according to any one of claims 1 to 6.