JP2003161638A - Device for generating rotation signal and system for detecting rotation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for generating rotation signal and a system for detecting rotation with a small and inexpensive structure eliminating the need for wiring a power source and exchanging a battery. <P>SOLUTION: The device for generating rotation signal 10 which is a device for detecting the rotation of a rotating body 12, is provided with a power generating section 2 which has a piezo-electric element 21 and a collision member 22 and generates power when the collision member 22 impacts on the piezo-electric element 21 because of the rotation of the rotating body 12, and a transmitting section 4 which generates signals according to the rotation of the rotating body 12 by using the generated power. The system for detecting rotation 1 is provided with the device for generating rotation signal 10, and a detecting device 11 which receives the signal transmitted from the device for generating rotation signal 10 and detects the rotation of the rotating body 12. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field of a rotation signal generator and a rotation detection system for detecting rotation of a rotating body.

[0002]

2. Description of the Related Art Conventionally, detection using light has been known as a device for detecting the rotation of a rotating body. For this, for example, a disc-shaped member attached to a rotating body is formed with slits at predetermined intervals in the rotation direction, and a light projecting element and a light receiving element are arranged with the slit sandwiched therebetween. Then, due to the rotation of the disk-shaped member associated with the rotating body, the light interrupted by the slit is detected as a pulse signal. In this case, an optical fiber for guiding light may be used.

[0003]

However, in such a conventional detecting device, the number of parts required for detection is large, such as a disk-shaped member having a slit, a light projecting element, a light receiving element, and an optical fiber. In addition, optical parts and the like are also required, which is complicated. Therefore, there has been a problem that the entire device becomes large and expensive.

In addition, the conventional detection device must be connected to a power source to supply electric power, or must be equipped with a battery and replaced periodically. However, depending on the rotating body,
In many cases, wiring for the power supply is difficult, it is located in a remote place where it is difficult for people to visit to replace the battery, or it is located in a site where battery replacement work itself is difficult to do. . Therefore, there has been a demand for detecting rotation regardless of the structure of the rotating body and the place where the rotating body is installed.

In consideration of such a problem, the present invention provides
An object of the present invention is to provide a rotation signal generator and a rotation detection system which are small in size and inexpensive in construction and do not require power supply wiring or battery replacement.

[0006]

In order to solve the above problems, the rotation signal generator of the present invention employs the following means.

That is, according to the first aspect of the present invention, there is provided a device for detecting the rotation of a rotating body, which has a piezoelectric element and a collision member, and the collision member collides with the piezoelectric element by the rotation of the rotating body to generate electric power. And a transmitter that transmits a signal associated with the rotation of the rotating body by the generated power.

According to this means, the collision member collides with the piezoelectric element by the rotation of the rotating body and causes the piezoelectric element to generate electric power. Then, the transmitter generates a signal using the generated power. Since the generated signal is a signal accompanying the rotation of the rotating body, the rotation can be detected. Further, since the power generation unit generates power by itself, wiring for a power source and a battery are not required.

According to a second aspect of the present invention, in the rotation signal generating device according to the first aspect, a signal for wirelessly propagating in water or in the air is transmitted from the transmitting portion.

With this means, a signal for transmitting one or both of water and air is transmitted, so that wiring for transmitting the signal becomes unnecessary.

According to a third aspect of the present invention, in the rotation signal generating device according to the first or second aspect, the collision member collides with the piezoelectric element to generate electric power each time the rotating body rotates, and the collision occurs from the transmitting unit to each rotation. It is characterized by transmitting a signal.

[0012] In this means, the signal is transmitted once per rotation from the transmitting portion while self-power generation.

According to a fourth aspect of the present invention, in the rotation signal generating device according to the first or second aspect, the collision member collides with the piezoelectric element to generate electric power each time the rotating body rotates, and the transmitting unit generates the electric power at an arbitrary timing. It is characterized by transmitting a signal.

According to this means, a signal is generated once every n revolutions while the generator is self-powered, and the signal is transmitted multiple times per revolution, or an external instruction is given. It is received and sent. In addition, it is also set to transmit when the state of rotation changes, or when it exceeds or falls below a certain fixed rotation.

According to a fifth aspect of the present invention, in the rotation signal generator according to the first or second aspect, the collision member collides with the piezoelectric element every time the rotating body rotates to generate electric power, and the electric power is charged to charge the battery. When the signal reaches a predetermined level, a signal is transmitted from the transmitting unit.

In this means, the self-generated electric power is once charged, and a signal is emitted when the charged amount reaches a transmittable level. Since the amount of power generated by the piezoelectric element at one time is almost constant, the amount of charge is proportional to the rotation speed of the rotating body. Therefore, by setting the signal to be emitted when the predetermined level is reached, the signal is emitted in proportion to the rotation.

According to a sixth aspect of the present invention, in the rotation signal generating device according to the third to fifth aspects, the auxiliary power generation has a piezoelectric element and a collision member, and the collision member collides with the piezoelectric element by rotation of the rotating body to generate electric power. Is provided and supplies power to the transmitter.

In this means, since the amount of power generated by one power generation unit is limited, an arbitrary number of auxiliary power generation units for self-power generation by rotation are provided so that the auxiliary power generation unit also supplies power to the transmission unit. By doing so, the total power generation amount is increased. As a result, if the power generation of the power generation unit is insufficient for transmission,
It is possible to transmit a signal even when transmitting a signal that requires a large amount of power.

According to a seventh aspect of the present invention, in the rotation signal generator according to any one of the first to sixth aspects, the power generation section includes a plurality of piezoelectric elements, and these piezoelectric elements are arranged so as to be successively collided by the collision member. It is characterized in that it is arranged in a rectangular shape, and a signal including information on the order of the piezoelectric elements which are collided by rotation is transmitted from the transmitting portion.

In this means, the collision member collides with a plurality of piezoelectric elements arranged in a polygon during rotation to generate electricity.
The order of the collision depends on the rotating direction of the rotating body. Therefore, by transmitting this order as a signal, the rotation direction of the rotating body can be detected.

In order to solve the above problems, the rotation detecting system of the present invention employs the following means.

That is, in claim 8, claims 1 to 7
And a detection device that detects the rotation of the rotating body based on a signal from the rotation signal generation device.

In this means, the collision member of the rotation signal generator is moved by the rotation of the rotating body, collides with the piezoelectric element, and self-generates electric power. Then, the signal transmitted with the power is received by the detection device, and it is detected that the rotating body is rotating. Further, the number of rotations of the rotating body is detected by the time interval of signal reception.

According to a ninth aspect of the present invention, in the rotation detecting system according to the eighth aspect, the rotation signal generator is attached to the rotating body.

In this means, since the rotation signal generator is attached to the rotating body, the direction of gravity received by the collision member changes as the rotating body rotates. As a result, the collision member falls and collides with the piezoelectric element.

According to a tenth aspect of the present invention, in the rotation detecting system according to the ninth aspect, the rotation signal generating device is attached to the rotation body near the rotation axis.

By this means, the influence of centrifugal force on the movement of the collision member is reduced.

In the eleventh aspect of the present invention, in the rotation detecting system according to the eighth aspect, the collision member of the rotation signal generator is made of a magnetic material, and the collision member collides with the piezoelectric element due to a change in magnetic force due to rotation of the rotating body. As described above, the rotation signal generator is provided on either one of the rotating body and the fixed body around the rotating body,
A magnet is arranged on the other side.

According to this means, there are a case where the rotation signal generator is arranged on the rotating body and a magnet is arranged on the fixed body, and a case where the magnet is arranged on the rotating body and the rotation signal generator is arranged on the fixed body. When the rotation signal generating device or the magnet attached to the rotating body rotates with the rotation, the rotation signal generating device and the magnet are repeatedly approached and separated from each other, thereby colliding with the magnetic material. The magnetic force acting on the member changes. When approaching, the collision member is attracted to the magnet,
When separated, the collision member is released from the magnetic force. The rotation signal generator is arranged in advance in such a positional relationship that the collision member collides with the piezoelectric element due to a change in magnetic force. Therefore, when the collision member is released from the magnetic force, it falls and collides with the piezoelectric element. That is, the collision member collides with the piezoelectric element by the change in the magnetic force due to the rotation and causes the power to be generated.

In the twelfth aspect, the eighth to eleventh aspects are provided.
In the rotation detection system according to any one of 1 to 3, the detection device is installed separately from the rotation signal generation device.

In this means, the detection device separates and receives the signal transmitted from the rotation signal generating device which does not require wiring for the power source or battery replacement, so that only the rotation signal generating device is rotated arbitrarily. Attached to the body, the detection device can be installed at a site where it is easy to secure a power source for detection.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, as an embodiment (1),
A rotation detection system using the rotation signal generator of the present invention will be described with reference to the drawings. 1 is an explanatory view of a rotation detection system according to the embodiment (1), FIG. 2 is a sectional view of a power generation unit of a rotation signal generator according to the embodiment (1), and FIG. 3 is rotation detection according to the embodiment (1). System block diagram, Figure 4
5 is a circuit diagram of the rotation signal generator of the embodiment (1), FIG.
Is an explanatory view of an application example of the rotation detection system of the embodiment (1), and FIG. 6 is a partial cross-sectional view of the main part of FIG.

The rotation signal generating device 10 of the present invention is a device for detecting the rotation of the rotating body 12, and has a piezoelectric element 21 and a collision member 22, and the collision member 22 is piezoelectric by the rotation of the rotating body 12. The power generation unit 2 that collides with the element 21 to generate electric power and the transmission unit 4 that generates a signal according to the rotation of the rotating body 12 by the generated electric power are provided.

The rotation detecting system 1 of the present invention is
The rotation signal generation device 10 and the detection device 11 that receives the signal transmitted from the rotation signal generation device 10 and detects the rotation of the rotating body 12 are provided.

In the following embodiments, a signal propagating in either or both of water and air is transmitted from the transmission unit 4 of the rotation signal generator 10 to the detection device 11 installed at a distance. The received form will be described.
The signal will be described by taking a radio signal by an electromagnetic wave as an example. However, the signal is not limited to a radio signal (electromagnetic wave), but a signal that propagates in the air or underwater, such as an ultrasonic signal, a sound wave signal, an infrared signal, an optical It may be a signal or the like.
Further, depending on the structure of the rotating body 12, the signal generated by the transmitting unit 4 may be transmitted by wire.

The rotating body 12 of this embodiment performs a rotation having a vertical rotation component, and rotates about the rotating shaft 121. Detection regarding the rotating body 12 having no vertical rotation component will be described later in the embodiment (5). In the embodiment (1), the rotation signal generator 10 is attached to the rotating body 12 as shown in FIG.
The mode of rotating together with will be described. Although FIG. 1 shows the state where the rotation signal generator 10 is attached to the outside of the rotating body 12, it may be provided inside or inside the rotating body 12 as long as the transmitted signal can be detected by the detecting device 11.

The configuration of the power generation section 2 of the rotation signal generator 1 is
This will be described with reference to FIG. The power generation unit 2 is a box-shaped housing 2
The piezoelectric elements 21 mounted on the opposite wall sides of the inside of the housing 3 and the collision member 22 rolling inside the housing 23.
Are configured to collide. The collision member 22 is a ball. The piezoelectric element 21 has two PZT-based piezoelectric ceramic plates 211 and 212 joined so that their polarizations are opposite to each other. Performance is improved. In addition, the piezoelectric element 2
1 is partially adhered to the central portion of the plate-shaped cushion material 25 with an adhesive 24 (a fixing method other than adhesion may be used), and the cushion material 25 is fixed to the housing 23 with the adhesive 24. Therefore, the piezoelectric element 21 is protected from the impact of the collision of the collision member 22, and the vibration of the piezoelectric ceramic plates 211 and 212 is continued to improve the power generation performance. Then, the lead wires 261 to 264 are connected to the film-like electrodes (not shown) formed on the front and back surfaces of the piezoelectric element 21, respectively, and are drawn out to the subsequent stage. In addition, the surface of the piezoelectric element 21 (the collision member 22
The surface of the piezoelectric element 2 from the impact of the collision member 22.
A thin plate-shaped protector 27 for protecting 1 is fixed. Further, the collision member 2 is provided between the opposing piezoelectric elements 21.
There is provided a guide 28 that regulates the direction of rolling movement of 2 and guides it so as to accurately strike the portion of the piezoelectric element 21 to which the protector 27 is fixed. Although a cylindrical guide is shown here as the guide 28, a partition plate may be used.

As a material of each part, first, a material of zinc titanium zirconate type is suitable for the piezoelectric ceramic plates 211 and 212, but the material is not limited to this. Further, it is desirable that the piezoelectric ceramic plates 211 and 212 are as hard as possible and have a high Q value in order to sustain vibration for a long time and obtain more electric power. Specifically, the Q value is 1
It is preferably 000 or more, more preferably 2,000 or more. As the material of the cushion material 25, a synthetic resin material, a rubber material, or a soft material obtained by forming these into a sponge is suitable.
Foamed polyethylene or the like is suitable. As a material of the collision member 22, a heavier weight that does not damage the piezoelectric element 21 has higher power generation efficiency, and specifically, tungsten, iron, or the like is preferable. Further, as a material of the protector 27, a hard metal, a synthetic resin, or the like is suitable, and specifically, phosphor bronze, stainless steel, or the like is preferable, and phosphor bronze having good workability is easy to use.

The structure of the power generation section 2 and the method of generating power by the piezoelectric element 21 are not limited to the above. For example, a configuration in which the present inventor uses two collision members disclosed in Japanese Patent Laid-Open No. 2001-145375, a configuration in which the collision members are suspended by a spring material, and the like can be applied. Alternatively, a structure may be applied in which a single-layer piezoelectric ceramic plate 211 is laminated with a metal plate whose thickness is adjusted so that the strain deformation amount is balanced with it, and the collision member 22 collides from the metal plate side to generate electricity. In addition, in the above-described configuration, the piezoelectric element 21 is opposed to the two
Although it is provided in one place to improve the efficiency of power generation, it may be provided in only one place.

In the power generation section 2 having such a structure, the collision member 22 is guided by the guide 28 only, and falls due to the gravity during rotation and collides with the piezoelectric element 21. And the piezoelectric element 21 is caused to generate electric power. Further, it is preferable that the power generation unit 2 is provided near the rotation shaft 121 of the rotating body 12, that is, at a position as close to the rotation shaft 121 as possible. This is because, considering the gravity and the centrifugal force acting on the collision member 22, the centrifugal force increases as the rotation speed increases, and the collision member 2 that is about to fall.
Suppress the movement of 2. Therefore, in order to cause the collision member 22 to collide with the piezoelectric element 21 even at a high rotational speed, it is desirable to arrange the collision member 22 as close to the rotation shaft 121 as possible to reduce the influence of centrifugal force.

Next, the rotation signal generator 10 and the detector 1
The configuration of No. 1 will be further described with reference to FIG.

In the rotation signal generator 2, a charging unit 3 for rectifying and charging the generated power is provided between the power generation unit 2 and the transmission unit 4. The charging unit 3 includes a rectifying unit 3
1 and charging means 32 are provided. Rectifying means 31
Is a means for rectifying the AC power output from the power generation unit 2 into a pulsating flow. The charging means 32 is means for charging the pulsating flow obtained by the rectifying means 31 as direct current. The electric power once charged in the charging means 32 is supplied to the transmitting unit 4 in the subsequent stage.

The transmitting section 4 is provided with communication control means 41, signal switch means 42 and signal generation means 43. The communication control unit 41 is a unit that performs an operation required for communication, and this unit starts its operation when power is supplied from the charging unit 3. Then, when the operation is started, the signal switch means 42 is turned on, and the data for transmission is passed to the signal generation means 43. The signal switch means 42 is a means which is turned on by the communication control means 41 and supplies electric power to the signal generating means 43. The signal generation unit 43 converts the data for transmission received from the communication control unit 41 into a signal and transmits the signal.

On the other hand, the detecting device 11 is provided with a receiving section 5 for receiving a signal and a detecting section 6. Receiver 5
Since it shows an example of receiving an electromagnetic wave here, it is composed of a wireless receiver. Further, the detection unit 6 includes a determination circuit including a microprocessor, and detects the identification information (ID) of the received signal and the rotation of the rotating body 12 such as the number of rotations.

An example of the circuit configuration of the rotation signal generator 10 will be described with reference to FIG. The rectifying means 31 is a diode D
A full-wave rectification circuit is formed by 1 to D6, and the AC power output from the power generation unit 2 is rectified here and output as a pulsating flow to the subsequent stage. Lead wires 262 and 263 of the four lead wires 261 to 264 taken out from the power generation unit 2 are connected, and the three lead wires are connected to the six diodes D1 to D6. Note that here, the lead wires 262, 2
Although the circuit for reducing the number of diodes is formed by connecting 63, the lead wires 262 and 263 may be connected to eight diodes without connecting to form a full-wave rectification circuit.

The charging means 32 comprises a capacitor C1 and a Zener diode ZD1. The capacitor C1 may be replaced with a rechargeable battery. The pulsating current rectified by the rectifying means 31 is charged into the capacitor C1 as direct current, and the voltage across the capacitor C1 becomes high. Zener diode Z
D1 is provided to prevent overcharging of the capacitor C1. As a result, the capacitor C1 is charged with a predetermined charge amount. Here, the predetermined charge amount is configured so that the charge amount required for one transmission is charged.

The communication control means 41 includes a communication control circuit 411.
And a resistor R8 and FET1. Resistor R8 and FET
1 is provided for level conversion for interfacing the communication control circuit 411 and the signal switch means 42 with low power consumption. When electric power is supplied to the communication control circuit 411 by discharging from the charging means 32, the communication control circuit 411
The necessary steps for making a call are executed internally. The communication control circuit 411 has low power consumption. Further, one of the outputs from the power generation unit 2 is taken out to the communication control means 41 in order to take out the timing of rotation of the rotating body 12. Here, the lead wire 264 is branched and connected to the communication control circuit 411 as a timing signal. When the rotating body 12 makes one revolution, the lead wire 264 collides once with the connected piezoelectric element 21. Therefore, be sure to use lead wire 2
Since 64 can obtain the output once per rotation,
It is used as a timing signal indicating rotation. Of course, it may be taken out from any of the lead wires 261 to 263.

The signal switch means 42 includes a PNP transistor Tr4, resistors R6 and R7, and a capacitor C6. Since the signal generating circuit 431, which will be described later, requires relatively large electric power, the signal switch means 42 is configured to supply electric power to the signal generating circuit 432 by using the large electric power transistor switch Tr4. In the signal switch means 42, when the transmission start command from the communication control circuit 411 passes through the FET 1 and the resistor R7 to turn on the transistor Tr4, the signal generation means 43 operates to start transmission.

The signal generating means 43 is a signal generating circuit 431.
And the antenna 432, and the signal switch means 42
When the power is supplied by, the data for transmission received from the communication control circuit 411 is converted into a wireless signal and transmitted from the antenna 432.

The operation of the rotation detection system 1 using the rotation signal generator 10 of the embodiment (1) thus configured will be described. First, when the rotating body 12 rotates, the collision member 22 of the power generation unit 2 rolls and collides with the piezoelectric element 21. As a result, the piezoelectric element 21 is distorted and vibrates to generate AC power. Since the piezoelectric elements 21 and 21 are provided to face the power generation unit 2, the collision member 22 is provided to each of the piezoelectric elements 21 and 21 once for each rotation of the rotating body.
Collide. The AC power generated from these piezoelectric elements 21 and 21 is rectified by the rectifying means 31 of the charging section 3 into a pulsating flow, and this is charged into the charging means 32 as direct current. For the charging means 32, 1 determined by the Zener diode ZD1
The amount of charge required to make one call is charged. Then, when a timing signal indicating that one rotation has occurred is input to the communication control circuit 411 by the output from the lead wire 264,
The communication control circuit 411 operates and power is supplied to the communication control circuit 411.

In the communication control means 41, the communication control circuit 41
1 passes the data for transmission to the signal generating means 43, and at the same time operates the signal switch means 42 to supply the signal generating means 43 with electric power. As a result, the signal generation circuit 43
In 1, the data for transmission is converted into a radio signal and transmitted from the antenna 432.

The receiving unit 5 of the detecting device 11 receives the signal, and the detecting unit 6 detects that the rotating body 12 is currently rotating. Further, since the signal is transmitted once per rotation, the rotation speed of the rotating body 12 can be detected from the time interval of reception. It is also possible to determine which rotation signal generator 10 the signal is from based on the identification information included in the received signal.

In the above description, the power generation section 2 is configured to transmit when a timing signal is input to the communication control circuit 411 once per rotation, but the communication control circuit 411 measures the timing. Then, the signal may be transmitted from the transmission unit 4 at an arbitrary timing. The timing in this case is an operation in which the communication control circuit 411 has an interval timer, monitors a signal from the power generation unit 2, and transmits its rotation information and other information at regular intervals. It can also be set to call once. Further, the communication control circuit 411 may be connected to a switch function that is turned on by temperature, pressure, or a signal from the outside, and the temperature, pressure, or a signal from the outside may be combined with the transmission timing. Further, it may also be configured to transmit when the state of rotation changes, or when it exceeds or falls below a certain fixed rotation. Further, a plurality of power generation units 2 are arranged on the rotating body 12 at equal center angles, a plurality of rotation timing signals are connected to the communication control circuit 411, and a signal is generated n times per rotation. You may.

Next, an application example of the rotation detection system 1 using the rotation signal generator 10 of the present invention will be described with reference to FIGS. FIG. 5 shows a hoisting device 9 for fishing. The fishing boat 91 is provided with a take-up drum 92, and a fishing line 93 is paid out from the take-up drum 92 and wound up so that it can be wound up. A guide member 94 is arranged so as to project from the fishing boat 91, and a guide roller 95 is rotatably attached to the tip of the guide member 94. Then, the fishing line 93 is delivered while being hung on the guide roller 95 from above,
It will be rolled up.

As shown in FIG. 6, the main body 951 of the guide roller 95 is composed of a cylindrical body portion 952 and a pair of outer edge portions 953 attached so as to sandwich both ends thereof, and is rotatable about a core rod 954. Has become. Further, the main body 951 is provided with an internal space 955. Body 9
Since 51 is made of plastic, this internal space 955
Even if the rotation signal generator 10 is attached to the device, it is possible to transmit to the outside. The detection device 11 is installed in a vicinity such as a cockpit where an operator is always on standby.

In such a fishing hoisting device 9, when the sea 96 is under operation, the fishing boat 91 may shake greatly, which causes the fishing line 93 to come off the guide roller 95. It may end up. If the fishing line 93 comes off, a situation may occur in which the catch is missed or the fishing gear is damaged. Therefore, the guide roller 95
The rotation signal generation device 10 is attached to the detector, and the rotation is monitored by the detection device 11 at a separated position. Then, when the fishing line 93 starts to separate from the guide roller 95 and the number of rotations of the guide roller 95 becomes low, or the rotation further stops,
It is possible to promptly grasp by the detection by the signal, detect the possibility of the occurrence of the above situation, and take appropriate action. Further, the fishing line 93 may reduce the rotation speed of the guide roller 95 or may stop due to the entanglement of the adjacent fishing lines 93. According to the present invention, such a situation can be detected in advance or can be promptly treated.

As an application example of the rotation detection system 1 of the present invention, in addition to this, the rotation detection system 1 is applied to a belt conveyor and is used for detection of belt detachment, rotation speed abnormality, presence or absence of rotation, or an anemometer. The present invention can be applied to, to measure wind power by detecting the number of revolutions, or to be applied to a tire of a car to detect the number of revolutions, and can also be used to detect various revolutions.

Next, an embodiment (2) of the rotation detection system using the rotation signal generator of the present invention will be described with reference to the drawings. 7 is an explanatory view of the rotation detection system of the embodiment (2), FIG. 8 is a block diagram of the rotation detection system of the embodiment (2), and FIGS. 9 and 10 are rotation signal generation of the embodiment (2). It is a circuit diagram of an apparatus. In the embodiment (2),
The same description as that of the embodiment (1) is denoted by the same reference numeral, and the details are omitted.

In the rotation detection system 1 of the embodiment (2), the rotation signal generator 10 has the piezoelectric element 21 and the collision member 22, and the collision member 22 collides with the piezoelectric element 21 by the rotation of the rotating body 12. It is characterized in that it is provided with an auxiliary power generation unit 20 for generating power by supplying power to the transmission unit 4.

The auxiliary power generation unit 20 is configured to generate a signal immediately with the rotation of the transmission unit 4 when the amount of power generated by one collision of the piezoelectric element 21 of the power generation unit 2 is small. 2 is supplied to supply power to the transmitter 4. In this embodiment (2), the auxiliary power generation unit 20 has the same configuration as that of the power generation unit 2 (the same reference numerals are used in the circuit diagram of FIG. 9), but the collision member 22 becomes the piezoelectric element 21 as it rotates. The power generation unit 2 does not have to have the same configuration as long as it can generate power by collision. In FIG. 7, the auxiliary power generation units 20 are provided at three places, and are arranged in a circle around the rotating shaft 121 of the rotating body 12. Each of the auxiliary power generators 20 is connected to the transmitter 4 of the rotation signal generator 10 by a lead wire 201. The number and arrangement position of the auxiliary power generation units 20 are not limited to this, and may be appropriately determined according to the power required to generate a signal and the power generation capacity of the piezoelectric element 21. Further, the arrangement position may be outside, inside, or inside the rotating body 12. It is desirable that the auxiliary power generation unit 20 is also provided near the rotating shaft 121 in order to reduce the influence of centrifugal force.

In the embodiment (2), as shown in the block diagram of FIG. 8, the auxiliary power generation section 20 is provided in parallel with the power generation section 2 and is connected to the transmission section 4 via the charging section 3. The configuration of the charging unit 3, the transmission unit 4, and the detection device 11 is the same as in the embodiment (1).
Is the same as. An example of the circuit configuration of this embodiment (2) is shown in FIGS. 9 and 10 are continuous circuit diagrams, which are connected by + point, − point, and A point. In this rotation signal generator 10, the power generated by the power generation unit 2 and the auxiliary power generation unit 20 is charged in the charging unit 32 by the Zener diode ZD1 by a predetermined charging amount required for one transmission. Then, when the rotation timing signal extracted from the power generation unit 2 is input to the communication control circuit 411, it operates so as to transmit once per rotation.

In the embodiment (2) configured in this way, even when the amount of power generated by one piezoelectric element 21 is small, or when a signal that requires a large amount of power is transmitted, the auxiliary power generation unit 20 causes the transmission unit to generate a signal. 4 can be supplied with sufficient electric power. Other actions, effects and applications are the same as those of the embodiment (1).
Is the same as.

Next, an embodiment (3) of the rotation detection system using the rotation signal generator of the present invention will be described with reference to the drawings. FIG. 11 is a block diagram of the rotation detection system of the embodiment (3), and FIGS. 12 and 13 are circuit diagrams of the rotation signal generator of the embodiment (3). In the embodiment (3), the same description as that of the embodiment (1) is denoted by the same reference numeral, and the details are omitted.

The rotation detection system 1 of the embodiment (3) is characterized in that the electric power generated by the piezoelectric element 21 is charged and a signal is transmitted from the transmitter 22 when the charged amount reaches a predetermined level.

In the embodiments (1) and (2), the collision member 2
A signal was generated from the transmission unit 22 each time 2 collided with the piezoelectric element 21, but instead of this, in the embodiment (3),
The charging unit 3 is configured to supply power to the transmitting unit 4 after waiting for the electric power charged once to reach a predetermined chargeable level of charging amount. Since the amount of power generated by the piezoelectric element at one time is almost constant, the charging amount of the charging unit 3 and the rotation speed of the rotating body 12 are proportional. Therefore, a signal associated with rotation is generated by being configured to generate a signal when the charge amount reaches a predetermined level. As a result, even if the piezoelectric element 21 that generates a small amount of power once is used, the auxiliary power generation unit 20
It is possible to utilize for rotation detection without providing.

As shown in FIG. 11, in the embodiment (3), the power generation section 2 and the detection device 11 are similar to those in the embodiment (1). The charging unit 3 includes a determination unit 33 and a discharge switch unit 34 in addition to the rectification unit 31 similar to that of the embodiment (1).
Is provided. The charging means 32 is different from that of the embodiment (1) in that the Zener diode ZD1 is omitted. Transmitter 4
The signal switch means 42 similar to that of the embodiment (1).
In addition to the signal generating means 43, a discharge stopping means 44 is provided. The communication control means 41 is disconnected from the rotation timing signal from the power generation unit 2 and is connected to the output of the discharge switch means 34.

The determination means 33 of the charging section 3 is the charging means 32.
Is a means for intermittently monitoring and determining the charge amount of the piezoelectric element 21 according to the timing of power generation of the piezoelectric element 21. In this means, the charge amount is consumed in a very small amount at the time of monitoring, but since it is monitored intermittently, the power consumption due to the monitoring is suppressed and the influence on the charge amount is reduced. When the determination unit 33 determines that the charge amount of the charging unit 32 has reached a level at which the discharge can be transmitted, the discharge switch unit 34 starts discharging the charging unit 32 and supplies power to the transmission unit 4 in the subsequent stage. It is a means.

The discharge stopping means 44 of the transmitter 4 is the charging unit 3
It is a means for operating the discharge switch means 34 so as to stop the supply of electric power from. This means is operated by the communication control means 41 after the communication control means 41 has passed all the data necessary for transmission to the signal generation means 43.

An example of the circuit configuration of the rotation signal generator 10 will be described with reference to FIGS. 12 and 13, particularly the portion added in the embodiment (3). 12 and 13 are continuous circuit diagrams, which are connected by S point, + point, and − point.

As the discharge switch means 34, a self-holding type current switch is used. In the embodiment (3),
Complementary transistor is used, PNP transistor T
The r1 and the NPN transistor Tr2 are combined. In this discharge switch means 34, when a voltage lower than the voltage at point c by about 0.6 V (value determined by Tr1) is applied to point b, Tr1 turns on and Tr2 turns on almost at the same time. Thus, when the discharge switch means 34 is turned on, the impedance between the points c and d becomes extremely low. Then, the electric power stored in the capacitor C1 of the charging means 32 is discharged and supplied to the communication control means 41 with a very small loss. Then, this ON state continues until it becomes a self-holding state and the discharge is stopped.

The judging means 33 comprises capacitors C2 and C3 and resistors R1 and R2. C3 is provided to prevent malfunction. The capacitor C2 and the resistor R1 are provided between an output point a of the piezoelectric element 21 shown in FIG. 12 and a point b of the switch means 34 shown in FIG. The time constant determines the time for applying the voltage to the point b when determining the charge amount. Collision member 22 at point a
AC power is generated each time the collides with the piezoelectric element 21,
This voltage is a value obtained by adding the voltage in the forward direction of the diode D5 to the voltage across the capacitor C1. Then, the voltage of the capacitor C1 increases due to charging, and the AC voltage at the point a also increases. That is, at the point a, an AC voltage substantially proportional to the DC voltage across the capacitor C1 is obtained each time the collision member 22 collides, that is, intermittently. The AC voltage at the point a is applied to the point b for a very short time determined by the time constant of the resistor R1 and the capacitor C2. The voltage at the point b is determined by the distribution ratio of the resistors R1 and R2. As described above, the voltage at the point b is about 0.6 V (T
The discharge switch means 34 is turned on when a value of a low voltage (value determined by r1) is exceeded. Here, since the voltage at the point b is represented by “voltage at the point c × (1−R2 / (R1 + R2))”, the voltage at the point b is about 0.6 than the voltage at the point c.
When the voltage becomes equal to the V low voltage "voltage at point c-about 0.6 V", the threshold value for the determination becomes, and the level of the charge amount is determined by this. Therefore, by adjusting R1 and R2, it is possible to adjust the charge amount for starting the discharge to a level at which transmission can be performed. This level is set arbitrarily. Although the point a is provided on the lead wire 264 side here, it may be provided on the lead wire 261 side or the connected lead wires 262, 263 side. Further, although the determination is made here at the timing at which one of the two piezoelectric elements 21 generates power, the determination may be performed at the timing at which both piezoelectric elements 21 generate power.

The discharge stopping means 44 comprises a PNP transistor Tr3, resistors R4 and R5, and capacitors C4 and C5. The capacitors C4 and C5 are provided to prevent malfunction. In this means, when the communication control circuit 411 finishes sending the data necessary for transmission to the signal generating circuit 431, the communication control circuit 411 outputs a signal for turning on the transistor Tr3 through the resistor R4. When the transistor Tr3 is turned on, the self-holding of the discharge switch means 34 is released, the discharge of the electric power stored in the capacitor C1 is stopped, and the transmission operation ends.

The operation of the rotation detecting system 1 according to the embodiment (3) thus configured will be described. First, when the rotating body 12 rotates, the collision member 22 of the power generation unit 2 rolls. As a result, the piezoelectric element 21 is distorted and vibrates to generate AC power. Since the piezoelectric elements 21 and 21 are provided to face the power generation unit 2, the collision member 22 is provided to each of the piezoelectric elements 21 and 21 once for each rotation of the rotating body.
Collide. The AC power generated from these piezoelectric elements 21 and 21 is rectified by the rectifying means 31 of the charging section 3 into a pulsating flow, and this is charged into the charging means 32 as direct current. Then, by repeating the collision of the collision member 22 with the piezoelectric element 21, the charge amount of the charging means 32 gradually increases.

Each time the collision member 22 collides with one of the piezoelectric elements 21, AC power is intermittently generated at the point a, and the voltage at the point a rises as the charging amount of the charging means 32 increases.
When the AC voltage is generated at the point a, the determination means 3 is generated each time.
The voltage is applied to the point b only for a very short time determined by the time constant of the capacitor C2 of 3 and the resistance R1. If the voltage applied to this point b becomes a predetermined value or more, the discharge switch means 3
4 is turned on to be in the self-holding state, the electric power charged in the charging means 32 is discharged, and the electric power is supplied to the communication control means 41 of the transmitter 4 at once.

In the communication control means 41, when the power is supplied, the communication control circuit 411 passes the data for transmission to the signal generating means 43, operates the signal switch means 42, and supplies the power to the signal generating means 43. To supply. As a result, the signal generation circuit 431 converts the data for transmission to a radio signal and transmits it from the antenna 432. on the other hand,
When the communication control circuit 411 finishes sending the data necessary for transmission to the signal generation circuit 431, it turns off the signal switch means 42 and stops the supply of power to the signal generation circuit 431. Further, the discharge stopping means 44 is operated to stop the discharge by the discharge switch means 34. As a result, the charging means 32 starts charging again.

The signal transmitted from the rotation signal generator 10 is transmitted after being charged to a predetermined level by the charging section 3. If the rotation of the rotating body 12 is fast, it reaches the predetermined level quickly, and if it is slow, the signal is transmitted. Since it reaches slowly, it is transmitted at time intervals according to the number of revolutions, and the detection device 11 detects the presence or absence of rotation and the number of revolutions as in the first embodiment.

In the embodiment (3), one piezoelectric element 2 is used.
Even if the power generation amount of 1 is small, since the generated power is charged to a predetermined level, it is possible to obtain sufficient power by rotation to generate a signal in the transmission unit 4. Other functions, effects, and applications are the same as those in the embodiment (1).

Next, an embodiment (3) of the rotation detection system using the rotation signal generator of the present invention will be described with reference to the drawings. FIG. 14 is a cross-sectional view of the power generation unit of the rotation signal generator of the embodiment (4), and FIGS. 15 and 16 are circuit diagrams of the rotation signal generator of the embodiment (4). In the embodiment (4), the same description as that of the embodiment (1) will be denoted by the same reference numerals and will not be described in detail.

Rotation signal generator 10 of the embodiment (4)
The power generation unit 2 includes a plurality of piezoelectric elements 21, which are arranged in a polygon. Then, the detection device 11 is characterized in that the rotation direction of the rotating body 12 is detected by receiving a signal including information on the order of the piezoelectric elements 21 which are collided by the collision member 22 by rotation.

In the power generation section 2 of this embodiment, the piezoelectric elements 21 are arranged at three locations inside the housing 23 so as to form a substantially triangular shape. In addition, the piezoelectric elements 2 at three locations
Guide 2 for urging the collision member 22 to roll to 1 and collide
A plurality of partition plates 8 are provided. The guide 28 shown in FIG. 14 is formed as a curved surface so that the collision member 22 can easily collide with the center of the piezoelectric element 21, but the shape is not limited to that shown. The piezoelectric elements 21 may be arranged at four or more places. The configuration other than the number and arrangement of the piezoelectric elements 21 is the same as that of the embodiment (1).

For convenience of explanation, the piezoelectric elements 21 at three locations are used as the piezoelectric elements 2.
101 to 2103. In the power generation unit 2 configured in this way, as shown in FIG. 14, the collision member 22 that was initially in contact with the piezoelectric element 2101 moves in the direction of arrow A or in the direction of arrow B depending on the rotation direction of the rotating body 12. Change to move to. That is, in the case of the rotational direction moving in the direction of arrow A, the collision member 22 collides with the piezoelectric element 2101 → piezoelectric element 2102 → piezoelectric element 2103 in this order. On the contrary, in the case of the rotation direction moving in the arrow B direction, the collision member 2
2 collides with the piezoelectric element 2101, the piezoelectric element 2103, and the piezoelectric element 2102 in this order. In this way, the order of collision (power generation) on the piezoelectric elements 21 at three locations differs depending on the rotating direction of the rotating body 12. Therefore, by including the information of this order in the signal of the transmitting unit 4, the detecting device 11 can detect It can be detected. The rotation signal generator 10 detects the direction of rotation from the information on the order of collision, and the information on the direction of rotation is detected by the detector 1.
1 may be configured to be transmitted.

An example of the circuit configuration of this embodiment (4) will be described with reference to FIGS. 15 and 16 are +
They are connected by points, −points, and points B to D. The block diagram is the same as that in FIG. In this embodiment (4), the output from the power generation unit 2 is 12 of the rectifying means 31.
The diodes D10 to D21 perform full-wave rectification, and the charging unit 32 is charged. Further, in order to detect the order of collision of the collision member 22, the outputs of the piezoelectric elements 2101 to 2103 are branched. Here, the lead wires 261, 26
3, 266 are branched and connected to the communication control circuit 411. Then, the communication control circuit 411 detects the order of collision, and this is included in the data for transmission to the signal generation circuit 431. Further, any one of points B to C connected to the communication control circuit 411 is used as a rotation timing signal. Then, the detection device 11 receives and detects a signal including the information on the order of collision, and in addition to the detection of the presence or absence of rotation and the number of rotations of the rotating body 12 similar to the embodiment (1), the rotation direction is also determined. Can be detected.

Other functions, effects and applications are the same as in the embodiment (1).

Next, an embodiment (5) of the rotation detection system using the rotation signal generator of the present invention will be described with reference to the drawings. FIG. 17 is an explanatory diagram of the rotating system of the embodiment (5), FIG. 18 is an operation explanatory diagram of the power generation unit of the embodiment (5), and FIG. 19 is an operation of a modified example of the power generation unit of the embodiment (5). FIG.

In the embodiment (5), the rotation signal generator 1 is used.
The collision member 22 of 0 is made of a magnetic material, and the collision member 22 collides with the piezoelectric element 21 due to a change in magnetic force due to the rotation of the rotation member 12. The rotation signal generator 10 is arranged on one side, and the magnet 14 is arranged on the other side.

In the above-described embodiments (1) to (4), when the rotation of the rotating body 12 does not include any vertical component, the collision member 22 does not drop due to gravity.
Although it is not possible to collide with the piezoelectric element 21, in this embodiment (5), even if the rotating body 12 rotates only in the horizontal direction, it is possible to detect the rotation. Of course, this Embodiment (5) may be applied to the rotating body 12 having a vertical rotation component. In FIG. 17, an example in which the rotation signal generator 10 is provided in the rotating body 12 and the magnet 14 is provided in the fixed body 13 is shown, but the reverse is also possible. Although the rotation signal generator 10 is attached to the upper side surface of the rotating body 12, it may be provided on the lower side surface, the outer peripheral surface, or inside the rotating body.

Rotation signal generator 10 of this embodiment
The piezoelectric element 21 of the power generation unit 2 is provided only one place vertically below the collision member 22. The configuration of the piezoelectric element 21 and its surroundings is the same as that of the embodiment (1) as shown in FIG. The magnet 14 attached to the fixed body 13 has a positional relationship that allows the collision member 22 to move away from the piezoelectric element 21 by magnetic force when the magnet 14 approaches the rotation signal generator 10 during rotation. It may be attached at any position of 14.

The operation of the embodiment (5) thus configured will be described with reference to FIG. FIG. 18 is a cross sectional view seen from the side. The arrow attached to the magnet 14 in the drawing indicates the movement of the magnet 14 relatively. When the rotating body 12 further rotates, the rotation signal generating device 10 attached to the rotating body 12 and the magnet 14 attached to the fixed body 13 come close to each other once per rotation. When the collision member 22 is in the separated position where the magnetic force of the magnet 14 does not reach,
Since 1 is vertically downward, it is in a state of being mounted on the piezoelectric element 21. Then, when the magnetic force of the magnet 14 starts approaching to such an extent that the magnetic force affects the magnetic force, the magnetic force 14 pulls it up. At this time, since the guide 28 is provided, the guide 28 is pulled up along the guide 28. Then, when the magnetic force 14 moves away, the influence of the magnetic force disappears, and the magnetic force 14 falls along the guide 28 and collides with the piezoelectric element 21. This operation is repeated each time the magnet 14 approaches the collision member 22.

By the above-described operation, the piezoelectric element 21 and the collision member 22 collide once per rotation, and the electric power required for transmission can be self-generated. By combining this power generation unit 2 with the embodiments (1) to (3), the detection device 11 can detect the presence or absence of rotation and the number of rotations.

Next, FIG. 19 shows a modification of the power generation section 2 of the embodiment (5). This modification is an example in which the rotation direction is detected based on the configuration of the embodiment (5). In the configuration shown in FIG. 19, in the power generation unit 2 of the embodiment (5), two piezoelectric elements 21 are arranged side by side, the collision member 22 can collide with any of these piezoelectric elements 21, and the piezoelectric element 21 can collide. A guide 28 urges the collision member 22 to easily collide with the center of 21. For convenience, the two piezoelectric elements 21 are referred to as piezoelectric elements 2104 and 2105. In this configuration, when the collision member 22 is initially placed on the piezoelectric element 2104, when the magnet 14 approaches, the collision member 22 is pulled up and laterally moved in the traveling direction. When the magnet 14 is separated to a position where the influence of the magnetic force disappears, the collision member 2
2 falls on the piezoelectric element 2105. Then, when the rotation is repeated in the same direction, the collision member 22 is pulled up from the piezoelectric element 2105 and falls again on the piezoelectric element 2105. When the rotation direction changes, the collision member 22 is pulled up from the piezoelectric element 2105 and drops onto the piezoelectric element 2104. That is, the piezoelectric element 21 with which the collision member 22 collides differs depending on the rotation direction.

This power generation unit 2 is used in the embodiments (1) to (3).
Combined with. Then, the piezoelectric elements 2104 and 2105
Is connected to the communication control circuit 411 of the transmitter 4 to detect which piezoelectric element 21 has collided. Alternatively, it is configured to emit a signal including information as to which piezoelectric element 21 has collided. Accordingly, the detection device 11 can detect the presence or absence of rotation of the rotating body 12 and the rotation direction as well as the rotation number.

Other functions of the embodiment (5),
The effects and applications are similar to those of the embodiment (1).

In the above-described embodiments (1) to (5), various conditions such as the rotation specification of the rotating body 12, the power required for the signal to be transmitted, the power generation amount of the piezoelectric element 21 used, etc. are taken into consideration. Can be selected or combined as appropriate.

[0094]

As described above in detail, the rotation signal generator of the present invention and the rotation detection system using the same generate a signal associated with rotation with a simple structure in which a collision member collides with a piezoelectric element. Therefore, downsizing and cost reduction of the device can be easily achieved.

Further, since it is possible to generate a signal associated with rotation by self-power generation, it is not necessary to connect an external power source or replace a battery. Therefore, even if it is a remote place or a rotating body that is difficult to handle, it is possible to easily detect the rotation by attaching the rotating body first.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a rotation detection system according to an embodiment (1).

FIG. 2 is a cross-sectional view of a power generation unit of the rotation signal generator according to the embodiment (1).

FIG. 3 is a block diagram of a rotation detection system according to the embodiment (1).

FIG. 4 is a circuit diagram of a rotation signal generator according to an embodiment (1).

FIG. 5 is an explanatory diagram of an application example of the rotation detection system according to the embodiment (1).

6 is a partial cross-sectional view of the main part of FIG.

FIG. 7 is an explanatory diagram of a rotation detection system according to the embodiment (2).

FIG. 8 is a block diagram of a rotation detection system according to an embodiment (2).

FIG. 9 is a circuit diagram of a rotation signal generator according to an embodiment (2).

FIG. 10 is a circuit diagram of a rotation signal generator according to an embodiment (2).

FIG. 11 is a block diagram of a rotation detection system according to an embodiment (3).

FIG. 12 is a circuit diagram of a rotation signal generator according to an embodiment (3).

FIG. 13 is a circuit diagram of a rotation signal generator according to an embodiment (3).

FIG. 14 is a cross-sectional view of a power generation unit of a rotation signal generator according to an embodiment (4).

FIG. 15 is a circuit diagram of a rotation signal generator according to an embodiment (4).

FIG. 16 is a circuit diagram of a rotation signal generator according to an embodiment (4).

FIG. 17 is an explanatory diagram of a rotation system according to the embodiment (5).

FIG. 18 is an explanatory diagram of an operation of the power generation unit according to the embodiment (5).

FIG. 19 is an operation explanatory diagram of a modified example of the power generation unit of the embodiment (5).

[Explanation of symbols]

1 Rotation detection system 10 Rotation signal generator 11 Detection device 12 rotating body 121 rotation axis 13 Fixed body 14 magnets 2 power generation section 20 Auxiliary power generation section 201 lead wire 21 Piezoelectric element 211, 212 Piezoelectric ceramic plate 22 Collision member 23 housing 24 Adhesive 25 cushion material 261 to 266 lead wires 27 Protector 28 Guide 3 charging section 31 Rectification means 32 charging means 33 determination means 34 Discharge switch means 4 transmitter 41 Communication control means 411 Communication control circuit 42 signal switch means 43 Signal generation means 431 Signal generation circuit 432 antenna 44 Discharge stopping means 5 Receiver 6 detector 9 hoisting device 91 fishing boat 92 Winding drum 93 fishing line 94 Guide member 95 Guide roller 951 body 952 torso 953 outer edge 954 core rod 955 Internal space

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasuhiro Sakai             1-6-4 Osaki, Shinagawa-ku, Tokyo Stock market             Company USC F term (reference) 2B105 AL03 CA01 CA11 CJ11 PA09                 2F073 AA35 BB02 BC02 CC01 EE12                       GG01 GG02 GG04                 2F077 AA49 MM07 VV01 WW08

Claims (12)

[Claims] 1. A device for detecting rotation of a rotating body, comprising: a piezoelectric element and a collision member; and a power generation unit for generating power by the collision member colliding with the piezoelectric element due to rotation of the rotating body. A rotation signal generation device including a transmission unit that transmits a signal in accordance with rotation of the rotating body with the generated electric power. 2. The rotation signal generator according to claim 1, wherein the transmitter transmits a signal that wirelessly propagates in water or in the air. 3. The rotation signal generator according to claim 1 or 2, wherein the collision member collides with the piezoelectric element to generate electric power each time the rotating body rotates, and a signal is transmitted from the transmitting unit every rotation. A rotation signal generator characterized by: 4. The rotation signal generating device according to claim 1, wherein the collision member collides with the piezoelectric element to generate electric power each time the rotating body rotates, and transmits a signal from the transmitting unit at an arbitrary timing. A rotation signal generator characterized by: 5. The rotation signal generating device according to claim 1, wherein the collision member collides with the piezoelectric element to generate electric power each time the rotating body rotates, and the electric power is charged to reach a predetermined level. Then, the rotation signal generating device is characterized in that a signal is transmitted from the transmitting unit. 6. The rotation signal generating device according to claim 3, further comprising: an auxiliary power generation unit having a piezoelectric element and a collision member, the collision member colliding with the piezoelectric element by rotation of the rotating body to generate electric power, A rotation signal generator characterized by supplying electric power to a transmitter. 7. The rotation signal generator according to claim 1, wherein the power generation section includes a plurality of piezoelectric elements.
These piezoelectric elements are arranged in a polygon so as to be sequentially collided by a colliding member, and a signal containing information on the order of the piezoelectric elements collided by rotation is transmitted from a transmitting unit. . 8. A rotation detection system comprising: the rotation signal generator according to claim 1; and a detection device that detects rotation of a rotating body based on a signal from the rotation signal generator. 9. The rotation detection system according to claim 8, wherein the rotation signal generator is attached to the rotating body. 10. The rotation detection system according to claim 9, wherein the rotation signal generation device is attached to the rotation body near the rotation axis. 11. The rotation detection system according to claim 8, wherein the collision member of the rotation signal generator is made of a magnetic material, and the collision member collides with the piezoelectric element due to a change in magnetic force caused by rotation of the rotating body. A rotation detection system characterized in that a rotation signal generator is arranged on either one of a body and a fixed body around a rotating body, and a magnet is arranged on the other side. 12. The rotation detection system according to claim 8, wherein the detection device is installed separately from the rotation signal generation device.