JP2018096516A - Bearing with wireless sensor and bearing power feed system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing with a wireless sensor having a constitution which is suitable for suppressing an increase of the number of part items, a mounting volume and a mounting area when elongating a power generation part.SOLUTION: A bearing 4A with a first wireless sensor comprises: a plurality of magnets 11 in which N-poles and S-poles are aligned along an axial direction of a first cage 10, the N-poles and the S-poles of the magnets are arranged so as to adjoin each other in a peripheral direction of the first cage 10, and which are arranged while partially protruding from one end of the first cage 10 in the axial direction; a first coil 13 which is arranged at an internal peripheral face 71a of a core grid 71 of a first seal 7 opposing one-side faces of the magnets 11 in the axial direction; a first circuit part 14A including a power supply circuit, a control circuit, a radio circuit and an antenna; and a detection sensor 141 arranged at an internal peripheral face of an outer ring 6. The first coil 13 is used as a coil for power generation using electromagnetic induction generated by relative rotation with the magnets 11, and also used as an antenna for receiving a power feed electric wave.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a bearing with a wireless sensor having a power generation function.

  Conventionally, as a bearing with a wireless sensor having a redundant power generation unit, for example, there is a technique described in Patent Document 1. This technology includes, as a power generation unit, a power generator that generates power by relative rotation of a magnet and a coil, and a power reception unit that generates power by receiving driving power wirelessly transmitted from a feed power transmission unit.

JP 2005-301645 A

However, the conventional technique of Patent Document 1 has a configuration in which power generation by a generator (rotating mechanism) and power generation by a power receiving unit are separated. In such a configuration, each needs to be provided with a direct current conversion circuit for converting alternating current into direct current, and a coil for electromagnetic induction and an antenna for power reception are also required. Therefore, in addition to an increase in the number of parts, an increase in mounting volume and mounting area is inevitable.
Accordingly, the present invention has been made paying attention to such an unsolved problem of the conventional technology, and when the power generation unit is duplicated (redundant) by electromagnetic induction power generation and wireless power generation, components It is an object of the present invention to provide a bearing with a wireless sensor having a configuration suitable for suppressing an increase in the number of points, mounting volume, and mounting area, and a bearing power supply system including the bearing.

  In order to solve the above problems, a bearing with a wireless sensor according to a first aspect of the present invention includes a magnet fixed to one of two bearing components that rotate relative to each other, and the other of the two bearing components. A coil that is fixed opposite to the magnet and is used as a power generation coil that uses electromagnetic induction by relative rotation with the magnet, and that is also used as an antenna for receiving a radio wave for power feeding; A current generated in the coil and a current generated in the coil upon reception of the power supply radio wave are supplied, a power supply circuit that generates drive power using the current, a transmission antenna that transmits a radio signal, and the power supply A sensor to which driving power is supplied from a circuit, and a process of drivingly supplying information from the power supply circuit and wirelessly transmitting information based on the detection result of the sensor via the transmitting antenna. Comprising a radio processing circuit for performing a.

  In order to solve the above problems, a bearing with a wireless sensor according to a second aspect of the present invention includes a first race ring having a first raceway surface on an outer peripheral surface and a first raceway facing the first raceway surface. A second bearing ring having two raceway surfaces on the inner circumferential surface, a plurality of rolling elements arranged on a raceway formed by the first raceway surface and the second raceway surface, and the first raceway ring, An annular cage that is provided between the second raceway ring and holds the plurality of rolling elements in a circumferentially spaced manner; and the first raceway ring and the second raceway. An annular seal that is supported by a fixedly supported raceway of the rings and seals between the first raceway and the second raceway, and a side of the cage that faces the seal A magnet arranged so that N poles and S poles are alternately arranged in the circumferential direction on the end face, and opposite to the magnet of the seal A coil that is used as a power generation coil that utilizes electromagnetic induction by relative rotation with the magnet, and a coil that is also used as a receiving antenna for power feeding radio waves, A sensor that is provided on the inner side of the outer surface of the race and detects a physical quantity related to a physical phenomenon that occurs in a component including the race, a transmitting antenna provided on the seal, and the multipolar ring magnet of the seal A wireless processing circuit that performs processing for wirelessly transmitting information based on the detection result of the sensor via the transmitting antenna, and a side of the seal that faces the multipolar ring magnet The sensor and the wireless processing circuit are driven using the current generated in the coil by the electromagnetic induction and the current generated in the coil by receiving the power supply radio wave. It comprises a power supply circuit for supplying power, a.

  Moreover, in order to solve the said subject, the bearing electric power feeding system which concerns on the 3rd aspect of this invention is based on the bearing with a wireless sensor of the said 1st form or the said 2nd form, and reception of an electric power feeding start signal. A wireless power feeder that transmits the power supply radio wave toward the bearing with the wireless sensor. The sensor includes a speed sensor that detects a rotational speed of the bearing, and the wireless processing circuit transmits the wireless signal via the transmission antenna when the rotational speed is equal to or lower than a preset speed. A power feeding start signal is transmitted to the power feeder.

  According to the present invention, a coil used for power generation by electromagnetic induction (hereinafter sometimes referred to as “electromagnetic induction power generation”) and power generation by reception of power supply radio waves (hereinafter referred to as “wireless power generation”) may be described. And a common coil are used as a common coil. As a result, when the power generation unit is duplicated by electromagnetic induction power generation and wireless power feeding power generation, it is possible to suppress an increase in the number of components, the mounting volume, and the mounting area as compared with the conventional case. As a result, it is possible to reduce the size and cost of the apparatus.

It is a block diagram which shows the structure of the 1st bearing electric power feeding system which concerns on 1st Embodiment. (A) And (b) is a fragmentary sectional view of the 1st bearing with a wireless sensor which concerns on 1st Embodiment, (a) is an example of the opposing state of a magnet and a 1st coil typically. FIG. 5B is a diagram schematically illustrating an example of a connection relationship between the first circuit unit and the detection sensor. It is a perspective view which shows the magnet, 1st holder | retainer, and yoke which comprise the 1st bearing with a wireless sensor which concerns on 1st Embodiment. (A) is a perspective view which shows the state which removed the 1st seal | sticker from the 1st bearing with a wireless sensor which concerns on 1st Embodiment, (b) saw the 1st seal | sticker from the coil formation surface side. It is a perspective view. It is a block diagram which shows the specific structure of the 1st radio | wireless communication unit which concerns on 1st Embodiment. (A) is a block diagram showing a specific configuration of the power supply circuit according to the first embodiment, and (b) is a block diagram showing a specific configuration of the detection sensor according to the first embodiment. It is a fragmentary sectional view of the 2nd bearing with a wireless sensor concerning a 2nd embodiment, and is a figure showing typically an example of the opposed state of a magnet and the 1st coil. It is a fragmentary sectional view of the 3rd bearing with a wireless sensor concerning a 3rd embodiment, and is a figure showing typically an example of the opposed state of a magnet and the 1st coil. (A) is a fragmentary sectional view of the 4th bearing with a wireless sensor concerning a 4th embodiment, and is a figure showing typically an example of the opposed state of a magnet and the 1st coil, (b) These are top views which show the structure of the core metal of the 3rd seal | sticker which concerns on 4th Embodiment. It is a figure explaining the diffraction phenomenon of the electric wave for electric power feeding in the 2nd bearing electric power feeding system which concerns on 5th Embodiment. (A) is a perspective view of the state which removed the 1st seal | sticker from the 5th bearing with a wireless sensor which concerns on 6th Embodiment, and cut off a part of outer ring, (b) is in 6th Embodiment. It is the perspective view which looked at the 1st seal which concerns from the coil formation surface side. It is a perspective view showing an example which attached a magnetic shield to the 1st seal concerning a 6th embodiment. It is a figure which shows the structural example of the multipolar ring magnet which concerns on 6th Embodiment. It is a fragmentary sectional view of the 5th bearing with a wireless sensor concerning a 6th embodiment, and is a figure showing typically an example of the opposed state of a multipolar ring magnet and a coil. It is a block diagram which shows the structure of the 3rd bearing electric power feeding system which concerns on 7th Embodiment. It is a block diagram which shows the structure of the 4th bearing electric power feeding system which concerns on 8th Embodiment. It is a block diagram which shows the structure of the 5th bearing electric power feeding system which concerns on 9th Embodiment. It is a block diagram which shows the specific structure of the 2nd radio | wireless communication unit 16B which concerns on 10th Embodiment. It is a block diagram which shows the specific structure of the 1st and 2nd power supply circuit which concerns on 10th Embodiment. It is a block diagram which shows the specific structure of the power supply circuit which concerns on 11th Embodiment. It is a block diagram which shows the specific structure of the 3rd power supply circuit which concerns on 12th Embodiment. It is a block diagram which shows the structure of the 6th bearing electric power feeding system 1F which concerns on 13th Embodiment. (A)-(d) is a fragmentary sectional view which shows typically the modification of the arrangement | positioning position of a detection sensor.

Next, first to thirteenth embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the vertical and horizontal dimensions and scales of members and parts are different from actual ones. Therefore, specific dimensions and scales should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.
Further, the following first to thirteenth embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is the material of the component, The shape, structure, arrangement, etc. are not specified below. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

(First embodiment)
(Constitution)
As shown in FIG. 1, the first bearing power supply system 1A according to the first embodiment includes a first wireless power feeder 2A, a first host device 3A, and a first bearing 4A with a wireless sensor. .
Hereinafter, the first bearing 4A with the wireless sensor may be simply referred to as “first bearing 4A”.
The first wireless power feeder 2A transmits a power feeding radio wave 200 obtained by converting preset power into a radio wave in response to receiving the power feeding start signal CS wirelessly transmitted from the first bearing 4A. To start. On the other hand, transmission of the power supply radio wave 200 is stopped in response to reception of the power supply stop signal CE transmitted wirelessly from the first bearing 4A.

The first wireless power feeder 2A includes a transmission antenna for a power supply radio wave 200 in addition to an antenna for transmitting and receiving a radio signal, and a first coil of a first bearing 4A to be described later via the transmission antenna. The power supply radio wave 200 having a frequency corresponding to the length 13 (λ / 2) is transmitted.
The first host device 3A includes a wireless transceiver 3w, and receives a sensor detection signal 300, which is a wireless signal including information based on the sensor detection result wirelessly transmitted from the first bearing 4A. And based on the information contained in the received sensor detection signal 300, operation | movement of the apparatus with which the 1st bearing 4A was mounted | worn is controlled.

  As shown in FIGS. 2A and 2B, the first bearing 4 </ b> A is disposed concentrically with the inner ring 5 on the outer side of the inner ring 5 and the inner ring 5 (bearing component) which is the first bearing ring. And an outer ring 6 (bearing component) which is a second bearing ring. Furthermore, a first seal 7 (bearing component) and a second seal 8 that seal a gap between the inner ring 5 and the outer ring 6 are provided. In the present embodiment, the inner ring 5 is fixed to a rotating shaft (not shown) and becomes a rotating wheel that rotates together with the rotating shaft, and the outer ring 6 is fixed to a bearing housing (not shown) or the like and becomes a stationary ring that does not rotate.

The first bearing 4 </ b> A further includes a first plurality of spherical rolling elements 9, a first cage 10, a plurality of magnets 11, a yoke 12, a first coil 13, and a detection sensor 141. Circuit portion 14 </ b> A and a magnetic shield 15.
The inner ring 5 has an inner ring raceway surface 51 formed at the axial center of the outer peripheral surface thereof, and first and second seal arrangement grooves 52 and 53 formed at both ends in the axial direction. The outer ring 6 has an outer ring raceway surface 61 formed at the axial center of the inner peripheral surface thereof, and first and second seal mounting grooves 62 and 63 formed at both ends in the axial direction.

In the first bearing 4 </ b> A, the inner ring raceway surface 51 and the outer ring raceway surface 61 are arranged to face each other, and the rolling elements 9 are arranged on a raceway formed by the inner ring raceway surface 51 and the outer ring raceway surface 61.
In the present embodiment, the first bearing 4A is composed of a ball bearing in which the rolling element 9 is spherical. However, the present invention is not limited to this configuration, and the shape of the rolling element 9 is conical, cylindrical, or needle-shaped. Alternatively, it may be composed of a roller bearing such as a barrel.
As shown in FIG. 3, the first cage 10 includes an annular rim portion 100, and a plurality of column portions 101 protruding in one axial direction of the rim portion 100 and arranged at predetermined intervals in the circumferential direction. Is provided. A pocket 102 for holding the rolling element 9 in a rollable manner is formed between the adjacent column parts 101, and the plurality of rolling elements 9 are arranged at substantially equal intervals in the circumferential direction.

The pocket 102 penetrates the peripheral surface of the first cage 10, and one axial end surface of the first cage 10 of the pocket 102 is open. That is, the first cage 10 is a crown type cage. A plurality of pockets 102 (eight in the first embodiment) are formed in the circumferential direction of the first cage 10. A through hole 103 extending in the axial direction for inserting the magnet 11 is formed in the column portion 101 between the adjacent pockets 102 of the first cage 10.
The inner surface of the through hole 103 includes a large-diameter surface 103a on the outer peripheral side of the first retainer 10, a small-diameter surface 103b on the inner peripheral side, and a pair of opposing surfaces 103c along the radial direction of the first retainer 10. 103d. One through hole 103 is formed in each column portion 101.

The first cage 10 further has an annular recess 104 that is recessed in the axial direction on the other end surface in the axial direction.
The magnet 11 is a neodymium magnet, and N poles and S poles are arranged along the axial direction of the first cage 10, one by one in every through hole 103, and each in the circumferential direction of the first cage 10. It arrange | positions so that the N pole and S pole of a magnet may adjoin. The shape of the magnet 11 is a shape corresponding to the inner surface of the through hole 103 of the first cage 10.

The magnet 11 includes an outer surface 110 corresponding to the large diameter surface 103 a of the through hole 103, an inner surface 111 corresponding to the small diameter surface 103 b of the through hole 103, and outer surfaces 112 corresponding to the pair of opposed surfaces 103 c and 103 d of the through hole 103, 113, an axial one end surface 114 on the axial one end surface 105 side of the first cage 10, and an axial other end surface 115 which is the opposite side surface.
The distance (dimension along the axial direction) between the one axial end surface 114 and the axial other end surface 115 of the magnet 11 is formed to be larger than the axial dimension of the first cage 10. Therefore, as shown in FIGS. 2 (a), 2 (b), and 4 (a), the magnet 11 disposed in the through hole 103 protrudes from the axial end surface 114 of the first cage 10. .

As shown in FIG. 3, the yoke 12 is an annular metal plate and has a dimension that fits into the recess 104 of the first retainer 10. As shown in FIGS. 2A and 2B, the yoke 12 is fitted in the recess 104 and is in contact with the other axial end surface 115 of the magnet 11 disposed in the through hole 103. The yoke 12 is made of a material having a high relative permeability such as electromagnetic steel.
In order to prevent the magnet 11 and the yoke 12 from deteriorating, it is preferable to cover the surfaces of the magnet 11 and the yoke 12 with a fluorine rubber coating or a vapor deposition film of parylene (common name of polyparaxylene). The first cage 10 is made of a nonmagnetic material such as 6,6-nylon (registered trademark). When the first cage 10 is manufactured by injection molding, it is preferable that the magnet 11 and the yoke 12 are arranged in a mold and integrally molded. The magnet 11 may be put into the through hole 103 of the first cage 10 that has been injection-molded and bonded, and the yoke 12 may be fitted into the recess 104 to be bonded.

  As shown in FIGS. 2A and 2B, the first seal 7 includes a metal core 71 and a rubber seal portion 72. As shown in FIGS. 2 (a), 2 (b), and 4 (b), a plurality of first surfaces are formed on the inner surface (surface facing the magnet 11) 71a of the cored bar 71 of the first seal 7. The coil 13 and a part of the components constituting one first circuit portion 14A are fixed. The core metal 71 is made of a material having high relative permeability such as electromagnetic steel. That is, the cored bar 71 serves as a yoke. An insulating film is formed on the inner side surface 71 a of the cored bar 71.

The first coil includes a cored bar 131 and a winding part 132 surrounding the cored bar 131. The core 131 of the first coil 13 is made of a material having a high relative permeability such as electromagnetic steel. In order to improve the amount of power generated by electromagnetic induction generated by the relative rotation of the first coil 13 and the magnet 11, the first coil 13 may use a thin film coil laminated as the winding part 132. And what wound the metal wire whose diameter is 0.01 mm or less may be used.
In the first embodiment, the first coil 13 serves as a coil for power generation by electromagnetic induction, and serves as a receiving antenna that receives the power supply radio wave 200 from the first wireless power feeder 2A. To serve concurrently. In order to achieve both of these roles, the first coil 13 is formed such that the amount of power generated by electromagnetic induction and the amount of power generated by wireless power feeding have maximum efficiency.

Specifically, the following (1) to (3) are given as design guidelines for the power generation coil when performing electromagnetic induction power generation.
(1) Since electromagnetic induction power generation is used as an operating power source for the first circuit unit 14A, it is possible to estimate the power required for power generation.
(2) Once the power necessary for power generation is known, the specifications of the magnet and coil are inevitably determined. Specifically, the surface magnetic flux density and rotation speed of the magnet, the number of turns of the coil, the air gap, the area where power generation is allowed, and the like are determined.
(3) In power generation by electromagnetic induction (power generation by a rotating mechanism), the amount of power generation increases as the number of turns of the coil increases.

Next, the following (4) to (5) are given as design guidelines for the antenna coil for wireless power feeding.
(4) When the length of the antenna is “one-integer” of the wavelength of the radio wave to be wirelessly fed, electrical resonance occurs and energy can be extracted. Here, the smaller the denominator value, the higher the efficiency, and usually 1/2 or 1/4 is used.
(5) The frequency at which electrical resonance occurs can be calculated by “f = v / (λ / 2)”. Here, f is the frequency [Hz] for wireless power feeding, v is the speed of radio waves (about 3.0 × 10 ⁸ [m / s]), and λ / 2 is the length of the antenna (length of the coil) [ m].

For example, when the coil length (λ / 2) is 10 [m], the frequency (f) for wireless power feeding is 15 [MHz]. That is, the transmission frequency of the power supply radio wave 200 is determined by the length of the antenna (the length of the coil). In other words, the length of the coil is determined from the power transmission frequency of the power supply radio wave 200.
Based on the design guidelines (1) to (5) above, electromagnetic induction and wireless power feeding are performed within a range in which power necessary for driving the first circuit portion 14A can be obtained and energy can be extracted from the power feeding radio wave 200. Find the optimal point where the power generation efficiency by the highest efficiency. And the 1st coil 13 is designed so that it may become the power generation efficiency of this optimal point.
As shown in FIGS. 2A and 2B, the first seal 7 has the inner peripheral portion of the seal portion 72 arranged in the first seal arrangement groove 52 of the inner ring 5, and the outer peripheral portion of the seal portion 72 is arranged. It is installed between the inner ring 5 and the outer ring 6 by being fitted into the first seal mounting groove 62 of the outer ring 6 in an elastically deformed state. That is, the first seal 7 is fixed to the outer ring 6.

The 2nd seal | sticker 8 is a normal seal | sticker which consists of the metal core 81 and the rubber-made seal | sticker part 82, as shown to Fig.2 (a) and (b). In the second seal 8, the inner peripheral portion of the seal portion 82 is disposed in the second seal placement groove 53 of the inner ring 5, and the outer peripheral portion of the seal portion 82 is elastically deformed into the second seal mounting groove 63 of the outer ring 6. It is installed between the inner ring 5 and the outer ring 6 by fitting. That is, the second seal 8 is fixed to the outer ring 6.
As shown in FIGS. 4B and 5, the first circuit unit 14 </ b> A includes a power supply circuit 140 </ b> A, a detection sensor 141, a control circuit 142, a wireless circuit 143, and an antenna 144. The first wireless communication unit 16A is composed of the first coil 13 and the first circuit unit 14A.

The power supply circuit 140 </ b> A, the control circuit 142, the wireless circuit 143, and the antenna 144 are formed on the remaining portion of the inner surface 71 a of the core metal 71 of the first seal 7 other than the formation portion of the first coil 13. In this embodiment, the power supply circuit 140A, the control circuit 142, and the wireless circuit 143 are provided with a magnetic shield for protecting them from grease and wear powder as shown in FIGS. 2 (b) and 4 (b). 15 is covered.
Here, the magnetic shield 15 is a component formed of a synthetic resin containing particles made of a metal with high magnetic permeability (for example, iron, permalloy, silicon steel) or a metal with high magnetic permeability.

Note that the antenna 144 may be provided on the surface of the first seal 7 opposite to the surface on which the first coil 13 is formed. In this case, a configuration may be adopted in which an accommodation portion is provided on the surface of the first seal 7 so that the antenna 144 does not protrude from the surface of the first seal 7 and the antenna 144 is accommodated in the accommodation portion.
In addition, the first coil 13, the power supply circuit 140, the control circuit 142, the wireless circuit 143, and the antenna 144 are not limited to be provided directly on the insulating film on the inner surface 71a, but are formed on a separate substrate and formed on the insulating film. It is good also as a structure attached by attachment means, such as adhesion | attachment or a fitting.

As shown in FIG. 6A, the power supply circuit 140A includes a rectifier circuit 140a, a smoothing circuit 140b, a storage circuit 140c, a storage secondary battery 140d, and a constant voltage output circuit 140e.
The rectifier circuit 140a rectifies AC power input from the first coil 13 and generated by electromagnetic induction, converts it to DC power, and outputs this DC power to the smoothing circuit 140b. In addition, the AC power generated by receiving the power supply radio wave 200 input from the first coil 13 is rectified and converted to DC power, and this DC power is output to the smoothing circuit 140b. For example, the AC current Ic input from the first coil 13 is full-wave rectified.

Smoothing circuit 140b smoothes the DC power from rectifier circuit 140a, reduces the AC component from the DC power, and outputs the reduced DC power to power storage circuit 140c.
The storage circuit 140c outputs the DC power input from the smoothing circuit 140b to the constant voltage output circuit 140e during the execution period of the arithmetic processing of the control circuit 142 and the wireless transmission processing of the wireless circuit 143. On the other hand, during the period when the calculation process of the control circuit 142 and the wireless transmission process of the wireless circuit 143 are not executed, the secondary battery for storage 140d is charged with the DC power input from the smoothing circuit 140b.

The secondary battery for power storage 140d is composed of, for example, a secondary battery such as a lithium ion secondary battery or a nickel / hydrogen secondary battery.
The constant voltage output circuit 140e supplies the DC power from the power storage circuit 140c or the DC power from the power storage secondary battery 140d to the control circuit 142, the radio circuit 143, and the detection sensor 141 as the driving power of the constant voltage Vb. In the present embodiment, the power stored in the secondary battery for power storage 140d is used as driving power for support after the detection sensor 141, the control circuit 142, and the wireless circuit 143 are started.

As shown in FIG. 2B, the detection sensor 141 is provided on the first seal 7 side with the rolling elements 9 on the inner peripheral surface of the outer ring 6 interposed therebetween. The detection sensor 141 includes one or more sensors that detect a physical quantity related to a physical phenomenon (for example, heat generation, vibration, deformation, rotation, etc.) that occurs in the components of the first bearing 4A.
Specifically, as shown in FIG. 6B, the detection sensor 141 of the present embodiment includes a temperature sensor 141a that detects temperature, an acceleration sensor 141b that detects acceleration (vibration), a load sensor 141c that detects load, and It is comprised from the speed sensor 141d which detects a rotational speed.

In the present embodiment, as shown in FIG. 5, the power generated by the first coil 13 is supplied to the detection sensor 141, the control circuit 142, and the wireless circuit 143 as drive power via the power supply circuit 140. Electrical wiring and the like are configured. In addition, electrical wiring or the like is configured so that the detection result of the detection sensor 141 is input to the control circuit 142.
The control circuit 142 performs arithmetic processing on the detection result of the detection sensor 141 and transmits the calculation result and a control signal to the wireless circuit 143. This control signal is a signal for controlling the wireless transmission operation of the wireless circuit 143. In the present embodiment, the detection result is wirelessly transmitted at a preset cycle, and the operation of the wireless circuit 143 is controlled so as to be in a sleep state except during transmission.

  The control circuit 142 further determines whether or not the rotational speed of the first bearing 4A is less than a preset speed threshold based on the detection result of the speed sensor 141d. And if it determines with having become less than a speed threshold value, operation | movement of the radio | wireless circuit 143 will be controlled so that the electric power feeding start signal CS may be wirelessly transmitted toward 2 A of 1st radio | wireless feeders. If it is determined that the rotation speed of the first bearing 4A is equal to or higher than a preset speed threshold after transmitting the power supply start signal CS (during wireless power supply), a power supply stop signal CE is sent to the first wireless power supply 2A. The operation of the wireless circuit 143 is controlled so as to transmit wirelessly.

Here, the power supply start signal CS may be transmitted when the determination that becomes less than the speed threshold value is continued N times (N is a natural number of 2 or more), without being limited to the single determination. Similarly, the power supply stop signal CE may be transmitted when determinations that are equal to or greater than the speed threshold value are continued N times. The speed threshold is the minimum value of the rotational speed at which sufficient power can be supplied to drive the detection sensor 141, the control circuit 142, and the wireless circuit 143 by power generation by electromagnetic induction.
That is, when the first bearing 4A rotates at a speed equal to or higher than the speed threshold, sufficient driving power can be supplied by electromagnetic induction, so the power transmission operation of the first wireless power feeder 2A is stopped during this period. To do. On the other hand, when the first bearing 4A rotates below the speed threshold or stops rotating, power generation by electromagnetic induction is insufficient or cannot be performed. 200 is transmitted, and driving power is supplied to each circuit by power generation by receiving the power supply radio wave 200.

The radio circuit 143 wirelessly transmits the sensor detection signal 300 including the calculation result to the outside through the antenna 144 in accordance with a control signal from the control circuit 142, and operates so as to be in a sleep state except for the transmission timing. To do. The wirelessly transmitted sensor detection signal 300 is received by the wireless transceiver 3w included in the first higher-level device 3A.
The wireless circuit 143 further wirelessly transmits a power supply start signal CS and a power supply stop signal CE to the outside via the antenna 144 in accordance with the control signal from the control circuit 142. The wirelessly transmitted power supply start signal CS and power supply stop signal CE are received by the first wireless power feeder 2A.
In this embodiment, the antenna 144 is configured by a microstrip antenna formed of a metal material having a low resistivity such as aluminum. In addition, you may comprise not only a microstrip antenna but other thin antennas, such as a dipole antenna.

(Operation)
Next, operation | movement of 1 A of 1st bearing electric power feeding systems which concern on 1st Embodiment is demonstrated.
Now, the rotating shaft (not shown) supported by the first bearing 4 </ b> A rotates to rotate the inner ring 5, and the rolling element 9 rolls along with this rotation, and the first driving force from the rolling element 9 causes the first to rotate. It is assumed that the cage 10 rotates. As a result, the magnetic pole surface (axial end surface 114) of the magnet 11 provided in the first cage 10 and the first coil 13 provided on the inner surface 71a of the core metal 71 of the first seal 7 are formed. Rotating motion is relatively performed around the rotation axis while facing each other.
Due to this relative rotational movement, an alternating electromotive force is generated in the first coil 13. This electromotive force is input to the power supply circuit 140, and is rectified and smoothed in the power supply circuit 140 to be converted into DC power. This DC power passes through the storage circuit 140c and is driven from the constant voltage output circuit 140e with a constant voltage Vb. Are supplied to the control circuit 142, the wireless circuit 143, and the detection sensor 141.

Thereby, the detection sensor 141, the control circuit 142, and the wireless circuit 143 are activated by supplying driving power that is equal to or higher than a predetermined power.
In the detection sensor 141, the temperature sensor 141a starts detecting the temperature of the outer ring 6, the acceleration sensor 141b starts detecting acceleration according to the vibration generated in the outer ring 6, and the load sensor 141c starts detecting the load applied to the outer ring 6. To do. Further, the speed sensor 141d starts to detect the rotational speed of the first bearing 4A (strictly, the first cage 10) based on, for example, a change in magnetic flux of the magnet 11.

The detection results of the temperature, acceleration, load, and rotation speed detected by these sensors 141 a to 141 d are input to the control circuit 142.
The control circuit 142 performs arithmetic processing on the detection results of temperature, acceleration, load, and rotation speed input from the detection sensor 141. Then, a control signal including the calculation result is output to the radio circuit 143 at a preset cycle.
The wireless circuit 143 wirelessly transmits the sensor detection signal 300 including the calculation result via the antenna 144 in accordance with the control signal from the control circuit 142. Note that the wireless circuit 143 enters a sleep state during a period when no control signal is input, and suppresses power consumption.

This sensor detection signal 300 is received by the wireless transceiver 3w of the first host device 3A. The first higher-level device 3A controls the operation of the device to which the first bearing 4A is mounted based on the calculation result included in the received sensor detection signal 300.
On the other hand, the control circuit 142 determines whether or not the rotational speed is less than a preset speed threshold based on the rotational speed input from the detection sensor 141.
If it is determined by this determination that the speed is not less than the threshold value, the operation by electromagnetic induction power generation is continued.

In addition, during the period when the arithmetic processing by the control circuit 142 and the wireless transmission processing by the wireless circuit 143 are not executed, the storage secondary battery 140d is charged by the storage circuit 140c. That is, the surplus power is stored. The electric power stored in the secondary battery for power storage 140d is used for driving support after activation of the detection sensor 141, the control circuit 142, and the wireless circuit 143.
The control circuit 142 outputs a control signal including a transmission instruction of the power supply start signal CS to the radio circuit 143 when the rotation speed of the rotation shaft becomes low and the rotation speed detected by the speed sensor 141d becomes less than the speed threshold. To do.

The radio circuit 143 wirelessly transmits the power supply start signal CS via the antenna 144 in accordance with the control signal from the control circuit 142.
This power supply start signal CS is received by the first wireless power feeder 2A. When the first wireless power feeder 2A receives the power feeding start signal CS, the first wireless power feeder 2A starts transmitting the power feeding radio wave 200.
Thereby, the first bearing 4 </ b> A receives the power supply electric wave 200 by the first coil 13, and AC power is generated in the first coil 13 by this reception. This AC power is input to the power supply circuit 140, and is rectified and smoothed in the power supply circuit 140 to be converted into DC power. This DC power passes through the power storage circuit 140c and is driven from the constant voltage output circuit 140e by a constant voltage Vb. Are supplied to the control circuit 142, the wireless circuit 143, and the detection sensor 141.

Thereby, the detection sensor 141, the control circuit 142, and the wireless circuit 143 are activated by supplying driving power that is equal to or higher than a predetermined power.
Thereafter, when the rotation speed of the rotation shaft increases and the rotation speed detected by the speed sensor 141d becomes equal to or higher than the speed threshold, the control circuit 142 outputs a control signal including an instruction to transmit the power supply stop signal CE to the radio circuit 143. To do.
The wireless circuit 143 wirelessly transmits the power supply stop signal CE via the antenna 144 in accordance with the control signal from the control circuit 142.
This power supply stop signal CE is received by the first wireless power feeder 2A. When the first wireless power feeder 2 </ b> A receives the power feeding stop signal CE, the first wireless power feeder 2 </ b> A stops transmitting the power feeding radio wave 200.
Here, in the first embodiment, the control circuit 142 and the radio circuit 143 correspond to a radio processing circuit, and the antenna 144 corresponds to a transmission antenna.

(Effect of 1st Embodiment)
(1) The first wireless sensor-equipped bearing 4A according to the first embodiment includes an inner ring 5 having an inner ring raceway surface 51 on an outer peripheral surface and an outer ring raceway surface 61 facing the inner ring raceway surface 51 on an inner peripheral surface. And an outer ring 6. Furthermore, the plurality of rolling elements 9 arranged on the track formed by the inner ring raceway surface 51 and the outer ring raceway surface 61 and the inner ring 5 and the outer ring 6 are provided so that the plurality of rolling elements 9 can roll freely. And an annular first retainer 10 that retains an interval in the circumferential direction. Further, an annular first seal 7 and a second seal 8 that are supported by the outer ring 6 and seal between the inner ring 5 and the outer ring 6, and a side of the first cage 10 that faces the first seal 7. And the magnet 11 arranged so that the N pole and the S pole are alternately arranged in the circumferential direction. Further, the first seal 7 is provided on the inner surface 71 a of the core 71 and is used as a power generation coil using electromagnetic induction by relative rotation with the magnet 11, and as a receiving antenna for the power supply radio wave 200. The first coil 13 is also used.

  Furthermore, a detection sensor 141 provided on the inner side of the outer surface of the outer ring 6 and detecting a physical quantity related to a physical phenomenon generated in a component including the outer ring 6, and an antenna 144 provided on the first seal 7 are provided. Furthermore, a control circuit 142 and a wireless circuit 143 that are provided on the inner surface 71a of the first seal 7 and perform processing for wirelessly transmitting information based on the detection result of the detection sensor 141 via the antenna 144 are provided. Furthermore, the detection sensor 141 is provided on the inner surface 71a of the first seal 7 by using the current generated in the first coil 13 by electromagnetic induction and the current generated in the first coil 13 by reception of power feeding radio waves. A power supply circuit 140 </ b> A that supplies driving power to the control circuit 142 and the wireless circuit 143.

With this configuration, the coil used for electromagnetic induction power generation and the antenna used for wireless power feeding power generation can be used as a common coil. Therefore, the AC power generated in the common coil is converted to DC by the common power supply circuit 140A. It can be converted into electric power.
As a result, when the power generation unit is duplicated (redundant) with electromagnetic induction power generation and wireless power feeding power generation, it is possible to suppress an increase in the number of components, the mounting volume, and the mounting area as compared with the conventional case. As a result, the apparatus can be reduced in size and cost.

Further, it is possible to supply driving power to the detection sensor 141, the control circuit 142, and the wireless circuit 143 by wireless power feeding even when the first bearing 4A rotates at a low speed or stops. As a result, the sensor detection signal 300 can be transmitted even when the first bearing 4A is rotating or stopped at a low speed, and the state of the first bearing 4A when rotating or stopped at a low speed can be grasped. .
Further, the detection sensor 141, the control circuit 142, the radio circuit 143, and the antenna 144 that constitute the wireless sensor unit, the magnet 11, the first coil 13, and the power circuit 140 that constitute the power source unit are arranged inside the first bearing 4A. Can be accommodated. That is, the first bearing 4A according to the present embodiment can have the same external configuration as a sensorless bearing that does not have a protruding portion such as a wireless sensor portion or a power source portion that protrudes outside the bearing.

  Thereby, for example, it becomes possible to easily replace the existing bearing without changing the shape of the bearing housing. Further, it can be configured by adding the detection sensor 141, the first coil 13, the power supply circuit 140, the control circuit 142, the wireless circuit 143, and the antenna 144 to the existing sensorless bearing components. That is, since at least a part of the component parts can be diverted with the existing bearing parts, the manufacturing can be easily performed.

(2) In the first bearing 4A with a wireless sensor according to the first embodiment, the first retainer 10 further protrudes in one of the annular rim portion 100 and the rim portion 100 in the axial direction and has a circumferential shape. A crown-shaped cage having a plurality of pillar portions 101 formed at intervals in a direction, and a plurality of pockets 102 formed between the pillar portions 101 and holding a plurality of rolling elements 9 in a freely rollable manner. It is. Further, the magnet 11 is fixed to the column portion 101 of the first cage 10 so as to penetrate the column portion 101 in the axial direction and the N pole and S pole of each magnet are alternately arranged in the circumferential direction. It is composed of a plurality of magnets.

With this configuration, the first coil 13 and a part of the first circuit portion 14A are fixed to the first seal 7, and the through hole 103 is provided in the column portion 101 of the first retainer 10, Since the magnet 11 disposed in the through hole 103 is protruded toward the first seal 7, it is possible to reduce the amount of decrease in the bearing internal space compared to the existing rolling bearing.
In addition, since most of the magnets 11 are embedded in the first cage 10, it is possible to use a magnet having a strong vertical magnetic field change for the first coil 13. As a result, it is possible to increase the power generation efficiency as compared with a structure having a small magnet embedding amount.

(3) The first wireless sensor-equipped bearing 4A according to the first embodiment is further provided on the end surface of the first cage 10 opposite to the side facing the first coil 13. An annular yoke 12 made of a magnetic material is provided.
If it is this structure, it will become possible to raise the magnetic flux density of the magnet 11 by the yoke 12, and it will become possible to improve the electric power generation amount by electromagnetic induction electric power generation.

(4) The first bearing power supply system 1A according to the first embodiment includes the first wireless sensor-equipped bearing 4A and a power supply electric wave toward the first bearing 4A in response to reception of the power supply start signal CS. 200 and a first wireless power feeder 2A for transmitting 200. The detection sensor 141 includes a speed sensor 141d that detects the rotational speed of the first bearing 4A. The control circuit 142 and the wireless circuit 143 transmit a power supply start signal CS to the first wireless power feeder 2A via the antenna 144 when the rotation speed becomes lower than a preset set speed. On the other hand, when the rotation speed becomes equal to or higher than the set speed, a power supply stop signal CE is transmitted to the first wireless power feeder 2A.

With this configuration, when the rotational speed of the first bearing 4A becomes low and the amount of power generated by electromagnetic induction is reduced or cannot be generated, the power supply start signal CS is sent to the first wireless power feeder 2A. It is possible to start transmission of the power supply radio wave 200 by transmission. On the other hand, when sufficient power generation can be performed by electromagnetic induction, transmission of the power supply radio wave 200 can be stopped.
As a result, power generation by the power supply radio wave 200 can be performed at a timing at which power generation by electromagnetic induction becomes difficult, and thus efficient power supply can be performed while suppressing unnecessary radio wave transmission.

(Second Embodiment)
The second embodiment differs from the first embodiment only in that a third seal 7A is provided instead of the first seal 7, and the other configurations are the same as those of the first embodiment. It becomes.
Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted as appropriate, and only different points will be described in detail.
The 2nd bearing 4B with a wireless sensor which concerns on 2nd Embodiment is provided with the 3rd seal | sticker 7A, as shown in FIG. The third seal 7A has a configuration including an annular core 71A made of a resin material, instead of the core 71 of the first seal 7 of the first embodiment.

Here, the cored bar 71 of the first embodiment is made of a metal material such as electromagnetic steel in order to serve as a yoke. For this reason, the energy of the power supply radio wave 200 is absorbed, and the power generation efficiency is reduced.
In addition, since electromagnetic induction power generation is performed by changing the magnetic flux passing through the coil, a yoke is not essential for electromagnetic induction power generation. For this reason, power generation is possible even if the first coil 13 is an air-core coil.
Based on the above, in the second embodiment, the core material 71A of the third seal 7A is formed from a resin material, and the role as a yoke is removed.

(Effect of 2nd Embodiment)
(1) A second bearing 4B with a wireless sensor according to the second embodiment is a core material 71A formed of a resin material instead of the first seal 7 in the first bearing 4A of the first embodiment. A third seal 7A having
With this configuration, when the power supply radio wave 200 is received, the energy of the radio wave can be prevented from being absorbed by the core material 71A of the third seal 7A. Accordingly, it is possible to improve the power generation efficiency in wireless power feeding as compared with the first bearing 4A of the first embodiment.

(Third embodiment)
The third embodiment is different from the second embodiment in that a metal thin film is formed on the surface of the first coil 13. Other than that, the configuration is the same as that of the second embodiment.
Hereinafter, the same reference numerals are given to the same components as those in the second embodiment, and description thereof will be omitted as appropriate, and only different points will be described in detail.
As shown in FIG. 8, the third bearing 4C with a wireless sensor according to the third embodiment is formed as a yoke on the surface of the first coil 13 of the second bearing 4B with a wireless sensor according to the second embodiment. The metal thin film 133 having a role is formed.
The metal thin film 133 may be formed, for example, by vapor-depositing a magnetic material such as iron on a flexible substrate on which a coil pattern is formed, or by forming a magnetic material in a metal foil shape and adhering it to the coil surface. May be.

(Effect of the third embodiment)
(1) The third bearing 4C with a wireless sensor according to the third embodiment has a metal thin film 133 formed on the surface of the first coil 13 in the second bearing 4B with a wireless sensor of the second embodiment. Yes.
Here, the radio wave has a property of transmitting the metal when the thickness of the metal is sufficiently thin with respect to the wavelength. Based on this principle, a metal thin film was formed on the surface of the coil. As a result, the metal thin film functions as a yoke to concentrate the magnetic flux during electromagnetic induction, and the energy absorption of the power supply radio wave can be reduced by the thin film shape. As a result, it is possible to improve the overall power generation efficiency as compared with the second embodiment.

(Fourth embodiment)
The fourth embodiment differs from the first embodiment only in that a fourth seal 7B is provided instead of the first seal 7, and the other configurations are the same as those of the first embodiment. It becomes.
Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted as appropriate, and only different points will be described in detail.
The 4th bearing 4D with a wireless sensor which concerns on 4th Embodiment is provided with the 4th seal | sticker 7B, as shown to Fig.9 (a) and (b).
The fourth seal 7B is configured to include a core bar 71B instead of the core bar 71 of the first seal 7 of the first embodiment.

The core bar 71B includes an annular and thin base portion 711, a plurality of slits 712 formed at equal intervals in the circumferential direction on a part of the plate surface of the base portion 711, and a coil formed on the slit 712. And a substrate portion 713 for use. The slit 712 is composed of a rectangular through hole. The constituent material of the cored bar 71B is the same as the cored bar 71 of the first embodiment. The substrate portion 713 is formed from a resin material, and the first coil 13 is formed on the substrate portion 713.
Here, the circumferential width ds of the slit 712 is provided so that the power supply radio wave 200 can pass therethrough. Specifically, the slit 712 is formed with a width equal to or greater than the wavelength of the power transmission frequency of the power supply radio wave 200. The slit 712 is formed in a range corresponding to the formation range of the first coil 13 of the base portion 711.

(Effect of 4th Embodiment)
(1) A fourth bearing 4D with a wireless sensor according to the fourth embodiment includes a position where the first coil 13 is formed instead of the first seal 7 in the first bearing 4A of the first embodiment. A fourth seal 7B having an annular cored bar 71B in which a plurality of slits 712 are formed at corresponding positions is provided.
With this configuration, the power supply radio wave 200 can reach the first coil 13 through the slit 712. As a result, it is possible to suppress the energy absorption of the power supply radio wave by the cored bar 71B and improve the power generation efficiency by the wireless power supply.

(Fifth embodiment)
The fifth embodiment differs from the first embodiment in that a second wireless power feeder 2B is provided instead of the first wireless power feeder 2A. Other than that, it becomes the structure similar to the said 1st Embodiment.
Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted as appropriate, and only different points will be described in detail.
As shown in FIG. 10, the second bearing power supply system 1 </ b> B according to the fifth embodiment includes a second bearing power supply system 1 </ b> A according to the first embodiment instead of the first wireless power feeder 2 </ b> A. The wireless power feeder 2B is provided.
The second wireless power feeder 2B starts transmission of the power supply radio wave 200A in the super-long wave band or the long-wave frequency band in response to receiving the power feeding start signal CS wirelessly transmitted from the first bearing 4A. To do. On the other hand, the transmission of the power supply radio wave 200A is stopped in response to reception of the power supply stop signal CE transmitted wirelessly from the first bearing 4A.

Here, the radio wave has the property of diffraction that goes around the object as the frequency becomes lower (the wavelength becomes longer). Based on this property, the fifth embodiment is configured to transmit the power supply radio wave 200A in the super long wave band or the frequency band of the long wave band.
With this configuration, as shown in FIG. 10, the distance (wavelength) Lw between the wave fronts Wf of the power supply radio wave 200 </ b> A is increased, and the wave that has traveled straight in the direction indicated by the large arrow in FIG. It wraps around the cored bar 71 by the diffraction phenomenon and propagates in the direction shown by the small arrow in FIG. As a result, the power supply radio wave 200 </ b> A wrapping around by diffraction reaches the first coil 13.
However, when only the power transmission frequency of the power supply radio wave is changed without changing the coil length of the first coil 13, it is necessary to change the resonance frequency of the first coil 13. Therefore, it is necessary to add a resonance circuit to the first wireless communication unit 16A.

(Effect of 5th Embodiment)
(1) The second bearing power supply system 1B according to the fifth embodiment is for supplying power in the ultra-long wave band or the long wave band depending on whether the second wireless power feeder 2B receives the power supply start signal CS. A radio wave 200A is transmitted.
With this configuration, it is possible to cause the power supply radio wave 200 </ b> A to reach the first coil 13 through the cored bar 71 due to the diffraction phenomenon. Thereby, it is possible to suppress the energy absorption of power supply radio waves in the cored bar 71 and improve the power generation efficiency by wireless power supply.
In addition, in combination with the configuration of the metal thin film 133 of the third embodiment, the power reception efficiency may be improved by transmission and diffraction of the metal thin film 133, and the power generation efficiency by wireless power feeding may be further increased.
Further, in combination with the configuration of the slit 712 of the fourth embodiment, the power reception efficiency may be improved by passing and diffracting the slit 712, and the power generation efficiency by wireless power feeding may be further increased.

(Sixth embodiment)
The sixth embodiment is different from the first embodiment in that a fifth wireless sensor-equipped bearing 4E is provided instead of the first bearing 4A. Other configurations are the same as those in the first embodiment.
Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted as appropriate, and only different points will be described in detail.
As shown in FIGS. 11A and 11B, the fifth bearing 4E with a wireless sensor according to the sixth embodiment is the same as the first bearing 10 in the first bearing 4A of the first embodiment. Instead of the first coil 13, the magnet 11 and the yoke 12, a second cage 17, a multipolar ring magnet 18 and a second coil 19 are provided.

The second cage 17 is composed of a normal crown type cage in which a through hole for arranging the magnet 11 is not formed like the first cage 10 of the first embodiment.
The second coil 19 is provided on the inner surface 71a of the core bar 71 of the first seal 7 by using a thin film pattern forming method such as an etching method using a conductor such as copper as a material.
As shown in FIG. 11B, the second coil 19 includes a first pattern 191 and a second pattern 192 for increasing the magnetic flux density (electromotive force), and a third pattern 193 that is a winding portion. Composed.

The first pattern 191 is a comb-like pattern in which linear patterns extending from the outer peripheral side end portion of the inner side surface 71a of the first seal 7 toward the inner peripheral side are formed at equal intervals in a circular arc shape in the circumferential direction. is there.
The second pattern 192 has a circumferential direction such that a linear pattern extending from the inner peripheral end of the inner surface 71a of the first seal 7 toward the outer peripheral side is different from the linear pattern of the first pattern 191. Are comb-like patterns formed in a circular arc at equal intervals.
The third pattern 193 is a pattern having a shape meandering in the circumferential direction while turning back into a rectangle so as to sew a gap between the linear patterns of the first pattern 191 and the second pattern 192 from the start end 194 to the end 195. It is.
In the present embodiment, the second coil 19 has a single layer structure, but a multilayer structure may be used to improve power generation.

  Similarly to the first coil 13 of the first embodiment, the second coil 19 plays a role as a coil for power generation by electromagnetic induction and a power supply radio wave 200 from the first wireless power feeder 2A. It also serves as a receiving antenna for receiving. Therefore, based on the same design guidelines as those in the first embodiment, the electric power necessary for driving the first circuit portion 14A can be obtained and the energy can be extracted from the power supply radio wave 200, and electromagnetic induction and wireless The first coil 13 is designed so that the power generation efficiency by the power supply becomes the highest efficiency.

As shown in FIG. 11A, the multipolar ring magnet 18 is provided on the end surface on the side facing the inner surface 71 a of the first seal 7 in the axial end surface of the second cage 17. .
As shown in FIG. 13, this multipolar ring magnet 18 has an annular and thin plate-shaped yoke 181 made of a ferromagnetic material such as an electromagnetic steel plate, and S poles and N poles alternately arranged in the circumferential direction. And an annular and thin plate-like magnet rubber sheet 182 arranged in a stacked manner. In this way, the magnetic flux density of the multipolar ring magnet 18 is increased by overlapping the yoke 181 and the magnet rubber sheet 182.

Then, the multipolar ring magnet 18 having such a configuration is disposed on the yoke 181 side on the end surface facing the inner surface 71a of the second cage 17 formed of a nonmagnetic material such as 6,6-nylon, for example. Are attached by joining the surfaces.
In the sixth embodiment, the second retainer 17, the yoke 181 and the magnet rubber sheet 182 are integrally formed by injection molding in order to prevent damage due to separation of the magnet rubber sheet 182 and the like during high-speed rotation.

From the viewpoint of strength, it is desirable to perform integral molding by injection molding. However, the multipolar ring magnet 18 formed by integrally molding the yoke 181 and the magnet rubber sheet 182 is bonded to the end surface of the second cage 17. It is good also as a structure attached with attachment means, such as a fitting. With this configuration, the existing sensorless bearing cage can be used as it is.
In place of the magnet rubber sheet 182, a plastic magnet having the same configuration may be used.
Further, in order to prevent deterioration of the multipolar ring magnet 18, the surface of the magnet rubber sheet 182 or the plastic magnet and the yoke 181 may be covered with a fluorine rubber coating or a vapor deposition film of parylene (common name of polyparaxylene). Good.
The magnet rubber sheet 182 or the plastic magnet preferably contains a neodymium magnet or a samarium cobalt magnet in order to improve the magnetic flux density.

With the above configuration, the bearing 4E has a magnetic pole surface of the multipolar ring magnet 18 provided in the second cage 17 and the second seal provided on the first seal 7 inside the bearing, as shown in FIG. The pattern surface of the coil 19 is disposed so as to face the axial direction. In general, the facing distance is preferably as small as possible because the magnetic force decreases as the distance between the magnet and the coil increases.
When the rotating shaft rotates and the inner ring 5 rotates, the rolling element 9 rolls, and the second cage 17 rotates by receiving a driving force from the rolling element 9. Thereby, the multi-pole ring magnet 18 rotates together with the second cage 17, and the multi-pole ring magnet 18 and the second coil 19 in a stationary state rotate relative to each other.

When the multipolar ring magnet 18 and the second coil 19 rotate relative to each other, the magnetic field formed around each magnetic pole pair of the magnet rubber sheet 182 moves together with the multipolar ring magnet 18, and the second coil 19 The direction of the magnetic field across the meandering surface of the three patterns 193 changes alternately with respect to the third pattern 193. Therefore, an electromotive force is generated in the third pattern 193 so that a current flows in a direction that cancels out the magnetic field passing through the inside surrounded by each rectangular portion. Since the magnetic field changes alternately with respect to the third pattern 193, the electromotive force generated in the third pattern 193 also changes alternately. Accordingly, an alternating electromotive force is generated between the start end 194 and the end end 195 of the third pattern 193.
At this time, since the multi-pole ring magnet 18 and the third pattern 193 rotate relatively, there is some dimensional variation in roundness, relative distance, magnetic pole spacing, meandering spacing, and the like. However, the fluctuation of the electromotive force generated between the start end 194 and the end end 195 is small, and stable power can be generated.

(Effect of 6th Embodiment)
(1) A fifth wireless sensor-equipped bearing 4E according to the sixth embodiment includes an annular and thin magnet rubber in which a multipolar ring magnet 18 has N and S poles arranged alternately and continuously in a circumferential direction. The sheet 182 has an annular and thin plate-shaped yoke 181 formed of a ferromagnetic material and fixed to one surface of the magnet rubber sheet 182 so as to overlap. In addition, the surface on the yoke 181 side is joined to the end surface of the second retainer 17 on the side facing the inner surface 71a of the first seal 7.
With this configuration, the magnetic flux density of the magnet rubber sheet 182 can be increased by the yoke 181, and the power generation amount of the second coil 19 can be improved. Moreover, since the multipolar ring magnet 18 can be provided on the end face of the existing cage, the existing cage can be used as it is at the time of manufacture.

(Seventh embodiment)
Compared with the first embodiment, the seventh embodiment includes a third wireless power feeder 2C instead of the first wireless power feeder 2A of the first bearing power supply system 1A, and the first bearing. The difference is that the control circuit 142 and the radio circuit 143 of 4A do not perform transmission processing of the power supply start signal CS and the power supply stop signal CE. Except for these, the configuration is the same as that of the first embodiment.
Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted as appropriate, and only different points will be described in detail.
As shown in FIG. 15, the third bearing power supply system 1 </ b> C according to the seventh embodiment includes a third bearing power supply system 1 </ b> A according to the first embodiment instead of the first wireless power feeder 2 </ b> A. The wireless power feeder 2C is provided. Furthermore, the first bearing 4 </ b> A is applied to an apparatus including a motor 20, a load 21, and a rotating shaft 22 that connects them. Specifically, the first bearing 4 </ b> A is provided at both ends of the rotating shaft 22. Still further, this apparatus is provided with a speed sensor 23 for detecting the rotational speed of the rotary shaft 22 and is connected to the third wireless power feeder 2C wirelessly or by wire.
Based on the rotational speed detected by the speed sensor 23, the third wireless power feeder 2C determines whether or not the rotational speed is less than a preset speed threshold. And if it determines with having become less than a speed threshold value, transmission of the electric wave 200 for electric power feeding will be started. On the other hand, if it is determined that the rotation speed has become equal to or higher than the speed threshold after starting the transmission of the power supply radio wave 200, the transmission of the power supply radio wave 200 is stopped.

(Effect of 7th Embodiment)
In the third bearing power supply system 1C according to the seventh embodiment, the third wireless power feeder 3C has a speed threshold that is set in advance based on the rotational speed of the rotary shaft 22 on which the first bearing 4A is mounted. When it becomes less than, transmission of the power supply radio wave 200 is started. On the other hand, when the rotation speed becomes equal to or higher than the speed threshold after the start of transmission, transmission of the power supply radio wave 200 is stopped.
With this configuration, when the rotation speed of the first bearing 4A becomes low and the amount of power generation by electromagnetic induction is reduced or power generation by electromagnetic induction cannot be performed, transmission of the power supply radio wave 200 can be started. It becomes possible. On the other hand, when sufficient electric power can be generated by electromagnetic induction, it is possible to stop the transmission of the power supply radio wave 200.
Thus, transmission of the power supply radio wave 200 is started at a timing when power generation by electromagnetic induction becomes difficult, and transmission of the power supply radio wave 200 can be stopped at a timing at which sufficient power generation by electromagnetic induction is possible. As a result, it is possible to suppress wasteful radio wave transmission and perform efficient power transmission.

(Eighth embodiment)
Compared to the first embodiment, the fourth bearing power supply system 1D according to the eighth embodiment is a second bearing device 3A instead of the first host device 3A of the first bearing power supply system 1A of the first embodiment. The difference is that the control circuit 142 and the radio circuit 143 of the first bearing 4A do not perform transmission processing of the power supply start signal CS and the power supply stop signal CE. Except for these, the configuration is the same as that of the first embodiment.

Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted as appropriate, and only different points will be described in detail.
As shown in FIG. 16, the fourth bearing power supply system 1D according to the eighth embodiment includes a second bearing power supply system 1A in the first embodiment instead of the first host device 3A. It is the structure provided with the high-order apparatus 3B. Furthermore, the first bearing 4 </ b> A is applied to an apparatus including a motor 20, a load 21, and a rotating shaft 22 that connects them. Specifically, the first bearing 4 </ b> A is provided at both ends of the rotating shaft 22. Still further, this apparatus is provided with a speed sensor 23 for detecting the rotational speed of the rotary shaft 22 and is connected to the second host apparatus 3B by radio or wire.

  Based on the rotational speed detected by the speed sensor 23, the second host apparatus 3B determines whether or not this rotational speed is less than a preset speed threshold. And if it determines with having become less than a speed threshold value, the electric power feeding start signal CS will be wirelessly transmitted toward 2 A of 1st wireless power feeders via the radio | wireless transmitter / receiver 3w. If it is determined that the rotation speed has become equal to or higher than a preset speed threshold after transmitting the power supply start signal CS (during wireless power supply), the power supply stop signal CE is sent to the first wireless power supply 2A via the wireless transceiver 3w. Wirelessly send to.

(Effect of 8th Embodiment)
In the fourth bearing power feeding system 1D according to the eighth embodiment, the second host device 3B has a rotational speed less than a preset speed threshold based on the rotational speed of the rotary shaft 22 to which the first bearing 4A is mounted. Then, a power supply start signal CS is transmitted to the wireless power feeder 2A. On the other hand, when the rotation speed becomes equal to or higher than the speed threshold during wireless power feeding, a power feed stop signal CE is transmitted to the wireless power feeder 2A.
With this configuration, when the rotation speed of the first bearing 4A becomes low and the amount of power generation by electromagnetic induction is reduced or power generation by electromagnetic induction cannot be performed, transmission of the power supply radio wave 200 can be started. It becomes possible. On the other hand, when sufficient power generation can be performed by electromagnetic induction, transmission of the power supply radio wave 200 can be stopped.
Thus, transmission of the power supply radio wave 200 is started at a timing when power generation by electromagnetic induction becomes difficult, and transmission of the power supply radio wave 200 can be stopped at a timing at which sufficient power generation by electromagnetic induction is possible. As a result, it is possible to suppress wasteful radio wave transmission and perform efficient power transmission.

(Ninth embodiment)
Compared with the first embodiment, the ninth embodiment includes a fourth wireless power feeder 2D instead of the first wireless power feeder 2A, and the control circuit 142 and the wireless circuit of the first bearing 4A. 143 is different in that the transmission process of the power supply start signal CS and the power supply stop signal CE is not performed. Except for these, the configuration is the same as that of the first embodiment.
Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted as appropriate, and only different points will be described in detail.
As shown in FIG. 17, the fifth bearing power supply system 1E according to the ninth embodiment is similar to the first bearing power supply system 1A of the first embodiment described above except that the fourth wireless power feeder 2A is replaced with a fourth wireless power feeder 2A. The wireless power feeder 2D is provided.

The fourth wireless power feeder 2D includes a power transmission control button 2b and a first wireless power feeder 2A.
Although not shown, the power transmission control button 2b includes a power transmission start button and a power transmission stop button. The power transmission control button 2b transmits a power supply start signal CS to the first wireless power feeder 2A when an operator presses the power transmission start button, and when the power transmission stop button is pressed, the power transmission stop signal CE is transmitted to the first wireless power supply 2A. It is configured to transmit to the power feeder 2A.

(Effect of 9th Embodiment)
In the fifth bearing power supply system 1E according to the ninth embodiment, the power transmission control button 2b transmits a power supply start signal CS to the wireless power feeder 200A when the power transmission start button is pressed. On the other hand, when the power transmission stop button is pressed during wireless power feeding, a power feeding stop signal CE is transmitted to the wireless power feeder 200A.
With this configuration, it is possible to start or stop the transmission of the power supply radio wave 200 at any timing of the operator.
Accordingly, for example, when the first bearing 4A is stationary, power generation by the power supply radio wave 200 can be performed at any timing of the operator (for example, timing when sensor detection information is desired). As a result, it is possible to perform efficient power transmission while suppressing wasteful radio wave transmission, and it is possible to inspect a failure or the like by obtaining sensor detection information at an arbitrary timing.

(10th Embodiment)
The bearing 4F (not shown) according to the tenth embodiment is different from the first embodiment in that a second circuit portion 14B is provided instead of the first circuit portion 14A. Other than that, it becomes the structure similar to the said 1st Embodiment.
Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted as appropriate, and only different points will be described in detail.
As shown in FIG. 18, the sixth bearing 4F with wireless sensor according to the tenth embodiment (not shown) is replaced with the first wireless communication unit 16A in the first bearing 4A of the first embodiment. The second wireless communication unit 16B is provided. The second wireless communication unit includes a second circuit unit 14B instead of the first circuit unit 14A of the first embodiment.

The second circuit unit 14B includes a first power circuit 140B for electromagnetic induction power generation and a second power circuit for wireless power generation in place of the power circuit 140A in the first circuit unit 14A of the first embodiment. 140C.
Further, the second circuit unit 14B is configured to change the electrical connection between the first coil 13 and the first power supply circuit 140B and the second power supply circuit 140C based on the switching signal from the control circuit 142, and A secondary battery for power storage 146 is newly provided.

As shown in FIG. 19, the first power supply circuit 140B includes a first rectifier circuit 140Ba, a first smoothing circuit 140Bb, a first power storage circuit 140Bc, and a first constant voltage output circuit 140Bd.
The first power supply circuit 140B is a circuit in which the characteristics of each circuit are adjusted so that the power generation efficiency is optimal with respect to electromagnetic induction power generation. Except for the difference in circuit characteristics, the configuration and operation contents are the same as those of the power circuit 140A of the first embodiment except that the power storage secondary battery is a power storage secondary battery 146 shared with the second power circuit 140C. It becomes.

As shown in FIG. 19, the second power supply circuit 140C includes a second rectifier circuit 140Ca, a second smoothing circuit 140Cb, a second power storage circuit 140Cc, and a second constant voltage output circuit 140Cd.
The second power supply circuit 140C is a circuit in which the characteristics of each circuit are adjusted so that the power generation efficiency is optimal with respect to the wireless power feeding power generation. Except for the difference in circuit characteristics, the configuration and operation contents are the same as those of the power circuit 140A of the first embodiment except that the power storage secondary battery is a power storage secondary battery 146 shared with the second power circuit 140C. It becomes.

Here, in the case where only weak power can be generated by wireless power feeding, it is possible to reduce energy loss by using a rectifier circuit using a diode having a low direction drop voltage (VF) characteristic. For this reason, in the tenth embodiment, the diode constituting the second rectifier circuit 140Ca is constituted by a diode having a lower value of the direction drop voltage (VF) than the diode constituting the first rectifier circuit 140Ba. ing.
On the other hand, the control circuit 142 of the tenth embodiment electrically connects the first coil 13 and the second power supply circuit 140C when the rotation speed is less than a preset speed threshold based on the detection result of the speed sensor 141d. The switching signal B2 to be connected is output to the changeover switch 145. On the other hand, when the rotation speed becomes less than a preset speed threshold value, a changeover signal B1 for connecting the first coil 13 and the first power supply circuit 140B is output to the changeover switch 145.

The changeover switch 145 switches the switch so that the first coil 13 and the first power supply circuit 140B are electrically connected in response to the input of the changeover signal B1. On the other hand, according to the input of the switching signal B2, the switch is switched so that the first coil 13 and the second power supply circuit 140C are electrically connected.
The secondary battery for power storage 146 is a secondary battery having the same configuration as the secondary battery for power storage 140d of the first embodiment.

(Effect of 10th Embodiment)
(1) The sixth wireless sensor-equipped bearing 4F according to the tenth embodiment has a first power supply circuit 140B whose circuit characteristics are adjusted for power generation by electromagnetic induction, and a circuit characteristic which is adjusted for power generation by the power supply radio wave 200. Second power supply circuit 140C. Based on the switching signal B1 or B2 from the control circuit 142, the changeover switch 145 switches the electrical connection with the first coil 13 to the first power supply circuit 140B at the time of power generation by electromagnetic induction, and at the time of power generation by power supply radio waves. Switches to the second power supply circuit 140C.
If it is this structure, it will become possible to generate electric power using the power supply circuit by which the circuit characteristic was adjusted appropriately at the time of electromagnetic induction and the time of wireless electric power feeding. As a result, wasteful energy consumption in the power supply circuit can be reduced, and power generation efficiency can be improved.

(Eleventh embodiment)
The eleventh embodiment differs from the first embodiment in that a power supply circuit 140D is provided instead of the power supply circuit 140A. Other than that, it becomes the structure similar to the said 1st Embodiment.
Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted as appropriate, and only different points will be described in detail.
The seventh wireless sensor-equipped bearing 4G (not shown) according to the eleventh embodiment has a configuration including a power supply circuit 140D instead of the power supply circuit 140A of the first embodiment.
As shown in FIG. 20, the power supply circuit 140D has a configuration in which an impedance matching circuit 140f is added to the preceding stage of the rectifier circuit 140a in the power supply circuit 140A of the first embodiment.

The impedance matching circuit 140f is a circuit that matches (matches) the output impedance of the first coil 13 and the input impedance of the power supply circuit 140D.
Here, if the output impedance of the first coil 13 and the input impedance of the power supply circuit 140D are not matched in the transmission of the power supply radio wave 200 having a high frequency, the energy to the power supply circuit side of the received power supply radio wave 200 is received. Transmission efficiency decreases.
The impedance matching circuit 140f calculates element values using a Smith chart based on, for example, the power transmission frequency of the power supply radio wave 200 and the impedance characteristics of the first coil 13 and the power supply circuit 140A. For example, an element such as an inductor (coil) or a capacitor having the calculated element value is connected in series or in parallel.

(Effect of 11th Embodiment)
(1) In the seventh bearing 4G with a wireless sensor according to the eleventh embodiment, the impedance matching circuit 140f of the power supply circuit 140D matches the impedance of the first coil 13 and the power supply circuit 140D.
With this configuration, the impedance matching circuit 140f matches the output impedance of the first coil 13 and the input impedance of the power supply circuit 140D, and the energy transfer efficiency to the power supply circuit side when receiving the power supply radio wave 200 is improved. It becomes possible to improve.

(Twelfth embodiment)
The twelfth embodiment differs from the tenth embodiment in that a third power supply circuit 140E is provided instead of the second power supply circuit 140C. Other than that, the configuration is the same as that of the tenth embodiment.
Hereinafter, the same components as those in the tenth embodiment are denoted by the same reference numerals, description thereof will be omitted as appropriate, and only different points will be described in detail.
An eighth wireless sensor-equipped bearing 4H (not shown) according to the twelfth embodiment includes a third power supply circuit 140E instead of the second power supply circuit 140C in the sixth bearing with wireless sensor 4F of the tenth embodiment. It has a configuration with.
As shown in FIG. 21, the third power supply circuit 140E has a configuration in which an impedance matching circuit 140Ce is added in front of the second rectifier circuit 140Ca with respect to the second power supply circuit 140C of the tenth embodiment. .

The impedance matching circuit 140Ce is a circuit that matches (matches) the output impedance of the first coil 13 and the input impedance of the third power supply circuit 140E.
Similar to the impedance matching circuit 140f of the eleventh embodiment, the impedance matching circuit 140Ce displays a Smith chart based on, for example, the power transmission frequency of the power supply radio wave 200 and the impedance characteristics of the first coil 13 and the second power supply circuit 140C. The element value is calculated using this. For example, an element such as an inductor (coil) or a capacitor having the calculated element value is connected in series or in parallel.

(Effect of 12th Embodiment)
(1) In the eighth bearing 4H with a wireless sensor according to the twelfth embodiment, the impedance matching circuit 140Ce of the third power supply circuit 140E matches the impedance of the first coil 13 and the third power supply circuit 140E.
With this configuration, the impedance matching circuit 140Ce matches the output impedance of the first coil 13 and the input impedance of the third power supply circuit 140E, and transmits energy to the power supply circuit side when receiving the power supply radio wave 200. Efficiency can be improved.

(13th Embodiment)
The thirteenth embodiment is different from the first embodiment in that a fifth wireless power feeder 2E is provided instead of the first wireless power feeder 2A. Other than that, it becomes the structure similar to the said 1st Embodiment.
Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted as appropriate, and only different points will be described in detail.
As shown in FIG. 22, the sixth bearing power supply system 1F according to the thirteenth embodiment is the same as the first bearing power supply system 1A according to the first embodiment, except that the fifth wireless power feeder 2A The wireless power feeder 2E is provided.

The fifth wireless power feeder 2E includes an impedance matching circuit 2m that matches the output impedance of the power transmission unit and the input impedance of the first wireless communication unit 16A.
The impedance matching circuit 2m is similar to the impedance matching circuit 140f of the eleventh embodiment, for example, the power transmission frequency of the power supply radio wave 200, the impedance characteristics of the fifth wireless power feeder 2E and the first wireless communication unit 16A, and the like. Thus, the element value is calculated using the Smith chart. For example, an element such as an inductor (coil) or a capacitor having the calculated element value is connected in series or in parallel.

(Effect of 13th Embodiment)
(1) In the sixth bearing power supply system 1F according to the thirteenth embodiment, the impedance matching circuit 2m of the fifth wireless power feeder 2E is connected between the fifth wireless power feeder 2E and the first wireless communication unit 16A. Match impedance.
With this configuration, the impedance matching circuit 2m matches the output impedance of the fifth wireless power feeder 2E with the input impedance of the first wireless communication unit 16A, and the power supply circuit side when receiving the power supply radio wave 200 is received. It becomes possible to improve the energy transfer efficiency to.
Further, since the impedance matching circuit is provided on the wireless power feeder side and not provided on the first wireless communication unit 16A, an increase in the number of parts on the first bearing 4A side can be suppressed.

(Modification)
(1) In the first embodiment, the detection sensor 141 is provided on the inner peripheral surface of the outer ring 6 that is a stationary wheel. However, the present invention is not limited to this configuration. For example, as shown in FIG. 23A, the first groove 64 may be formed in the shoulder portion of the outer ring 6 and the detection sensor 141 may be provided inside the first groove 64. Further, as shown in FIG. 23B, the second groove 65 may be formed on the outer peripheral surface of the outer ring 6, and the detection sensor 141 may be provided inside the second groove 65. As shown in c), the third groove 66 may be formed in the axial end surface of the outer ring 6, and the detection sensor 141 may be provided inside the third groove 66. Further, for example, as shown in FIG. 23 (d), the detection sensor 141 may be provided on the inner surface 71 a of the core 71 of the first seal 7. With this configuration, it is not necessary to extend the wiring between the control circuit 142 and the detection sensor 141 to the outside, it is easy to shorten the wiring length, and the wiring that can easily reduce the influence of noise mixing on the sensor signal. It can be configured.

(2) In each of the above embodiments, a neodymium magnet is used as the magnet 11. However, the present invention is not limited to this configuration, and other magnets such as a samarium cobalt magnet may be used.
(3) In each of the above embodiments, the four types of sensors, the temperature sensor 141a, the acceleration sensor 141b, the load sensor 141c, and the speed sensor 141d, are provided. However, the present invention is not limited to this configuration. For example, another type of sensor such as a sensor for detecting humidity may be provided.
(4) In each of the above embodiments, the acceleration sensor has been described as an example of the sensor that detects vibration, but the configuration is not limited thereto. For example, an AE (acoustic emission) sensor, an ultrasonic sensor, a shock pulse sensor, a microphone, or the like, or a physical quantity generated due to vibration such as speed, acceleration, strain, stress, displacement type, etc. can be converted into an electrical signal. Any other sensor may be used.

DESCRIPTION OF SYMBOLS 1A-1F ... 1st-6th bearing electric power feeding system, 2A-2E ... 1st-5th wireless power feeder, 3A-3B ... 1st-2nd high-order apparatus, 4A-4H ... 1st-8th Bearings with wireless sensors, 5 ... first race ring (inner ring), 6 ... second race ring (outer ring), 7, 7A, 7B ... first, second and third seals, 9 ... rolling elements, DESCRIPTION OF SYMBOLS 10, 17 ... 1st, 2nd retainer, 11 ... Magnet, 12, 18a ... Yoke, 13, 19 ... 1st, 2nd coil, 1st-2nd circuit part ... 14A-14B, 15 ... Magnetic shield, 16A to 16B ... First to second wireless communication units, 18 ... Multipolar ring magnet, 18b ... Magnet rubber sheet, 23, 141d ... Speed sensor, 71, 71B ... Core metal, 71A ... Core material, 100 ... Rim part, 101 ... Column part, 102 ... Pocket, 103 ... Through hole, 133 ... Metal thin film, 1 0A, 140D ... power supply circuit, 140B～140C ... first to the second power supply circuit, 141 ... detection sensor, 142 ... control circuit, 143 ... wireless circuit, 144 ... antenna, 200, 200A ... feeding wave, 712 ... slit

Claims (11)

A magnet fixed to one of two relatively rotating bearing components;
It is fixed to the other of the two bearing components opposite to the magnet, and is used as a power generation coil using electromagnetic induction by relative rotation with the magnet, and also as an antenna for receiving power feeding radio waves With the coil used,
A current circuit that is supplied with a current generated in the coil by the electromagnetic induction and a current generated in the coil by receiving the power supply radio wave, and generates a driving power using the current; and
A transmitting antenna for transmitting radio signals;
A sensor to which driving power is supplied from the power supply circuit;
A wireless sensor-equipped bearing comprising: a wireless processing circuit that is supplied with driving power from the power supply circuit and performs processing of wirelessly transmitting information based on a detection result of the sensor through the transmission antenna. A first bearing ring having a first raceway surface on an outer peripheral surface;
A second race ring having an inner circumferential surface with a second raceway surface facing the first raceway surface;
A plurality of rolling elements disposed on a track formed by the first track surface and the second track surface;
An annular retainer provided between the first raceway ring and the second raceway ring, and holding the plurality of rolling elements at intervals in the circumferential direction so as to be freely rollable;
An annular seal that is supported by a fixedly supported raceway of the first raceway and the second raceway and seals between the first raceway and the second raceway; ,
Magnets arranged so that N poles and S poles are alternately arranged in the circumferential direction on the end surface of the cage facing the seal;
Coil provided on the surface of the seal facing the magnet and used as a power generating coil using electromagnetic induction by relative rotation with the magnet, and also used as a receiving antenna for feeding radio waves When,
A sensor that is provided inside the outer surface of the fixedly supported bearing ring and detects a physical quantity relating to a physical phenomenon that occurs in a component including the bearing ring;
A transmitting antenna provided on the seal;
A wireless processing circuit which is provided on a surface of the seal facing the magnet and performs processing for wirelessly transmitting information based on the detection result of the sensor via the transmission antenna;
Provided on the surface of the seal facing the magnet, and using the current generated in the coil by the electromagnetic induction and the current generated in the coil by receiving the power supply radio wave in the sensor and the wireless processing circuit A bearing with a wireless sensor, comprising: a power supply circuit for supplying driving power. The retainer includes an annular rim portion, a plurality of pillar portions protruding in one axial direction of the rim portion and spaced apart in the circumferential direction, and formed between the pillar portions. A plurality of pockets for freely rolling the rolling element, and a crown-type cage having
The magnet is composed of a plurality of magnets that are fixed to the column portion of the cage in such a manner as to penetrate the column portion in the axial direction and to alternately arrange the north and south poles of each magnet in the circumferential direction. The bearing with a wireless sensor according to claim 2.   The bearing with a wireless sensor according to claim 3, further comprising an annular yoke provided on an end surface of the cage opposite to the side facing the coil and formed of a ferromagnetic material. The magnet is composed of an annular and thin multi-pole ring magnet in which N poles and S poles are alternately and continuously arranged in the circumferential direction,
Overlaid and fixed to one end face of the multipolar ring magnet, and provided with an annular and thin yoke formed from a ferromagnetic material,
The bearing with a wireless sensor according to claim 2, wherein the magnet and the yoke are provided by joining a surface on the yoke side to an end surface of the cage facing the seal. The seal has an annular core;
The bearing with a wireless sensor according to claim 2, wherein the core material is formed of a resin material.   The bearing with a wireless sensor according to claim 6, wherein a metal thin film is formed on a surface of the coil. The seal has an annular core;
The bearing with a wireless sensor according to any one of claims 2 to 5, wherein the core member is formed of a metal material, and a plurality of slits are formed at positions corresponding to positions where the coils are formed. The power supply circuit includes a first power supply circuit whose circuit characteristics are adjusted for power generation by the electromagnetic induction, and a second power supply circuit whose circuit characteristics are adjusted for power generation by the power supply radio wave,
9. The switch according to claim 1, further comprising: a switching unit configured to switch the electrical connection with the coil to the first power supply circuit during power generation using the electromagnetic induction and to switch to the second power supply circuit during power generation using the power feeding radio wave. A bearing with a wireless sensor according to claim 1.   The bearing with a wireless sensor according to claim 1, wherein the power supply circuit includes an impedance matching circuit that matches impedances of the coil and the power supply circuit. A bearing with a wireless sensor according to any one of claims 1 to 10,
A wireless power feeder that transmits the electric wave for power feeding toward the bearing with the wireless sensor in response to reception of a power feeding start signal,
The sensor includes a speed sensor that detects a rotational speed of the bearing,
The wireless processing circuit is a bearing power supply system that transmits a power supply start signal to the wireless power feeder via the transmission antenna when the rotation speed is equal to or lower than a preset set speed.

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