JP6567892B2 - Rotary axis sensor reader - Google Patents

Description

  The present invention relates to a rotary shaft sensor reading device that reads data from a sensor installed on a rotary shaft.

  As a background art in this technical field, there is JP 2008-249046 A (Patent Document 1). In this publication, power can be supplied in a non-contact manner between the rotating side and the stationary side, and power can be supplied even when the rotation is stopped. The power supplied to the rotating side can be used as various power sources such as sensors. A wheel bearing with a power transmission device is described (see abstract). There is also JP-A-10-124787. This publication describes that noise in a slip ring mechanism is reduced and a state detection signal of a rotating body is obtained accurately and reliably. (See summary)

JP 2008-249046 A JP-A-10-124787

  Patent Document 1 describes a wheel bearing with a power transmission device that can be used as various power sources such as sensors. However, the method of Patent Document 1 has a problem that high accuracy is not required because remote measurement is performed without attaching a sensor directly to the rotating shaft. Further, Patent Document 2 describes a rotating body state detection device that can sufficiently perform state detection in a low speed region. However, in Patent Document 2, since the center of gravity changes depending on the rotor, vibration due to high-speed rotation occurs and is not stable. In addition, the slip ring mechanism may be influenced by electromagnetic noise, and stable measurement may not be possible.

  Therefore, the present invention provides a rotating shaft sensor reading device that is resistant to electromagnetic noise, enables stable sensor reading even when rotating at high speed, and can perform stable power transmission.

  In order to solve the above problems, the present invention comprises an antenna pattern, a shaft fixing substrate fixed to a rotating shaft, a sensor measuring unit connected to the shaft fixing substrate and installed on the rotating shaft, An external fixed substrate having an antenna pattern disposed at a position facing the shaft fixed substrate and fixed to the outside of the rotary shaft, and a rotary shaft sensor reading device, through the antenna pattern, The sensor data measured by the sensor measurement unit is transmitted from the shaft fixed substrate to the external fixed substrate.

According to the present invention, stable data transfer or power transmission is possible without being affected by noise.

It is a structure schematic diagram of a rotating shaft sensor reader. It is a generated current diagram in the antenna loop of the shaft fixed substrate and the external fixed substrate. It is an area view of the coil which overlaps between an axis | shaft fixed board | substrate and an external fixed board | substrate. It is explanatory drawing of the electric power transmission and data transmission of a stationary side and a rotation side. The centrifugal force which arises by the rotation in a shaft fixed board | substrate is shown.

  Hereinafter, examples will be described with reference to the drawings. In this embodiment, an externally fixed substrate and a circular substrate with a hole in the center perpendicular to the axis rotated by an electric motor or the like are attached in parallel, and the antenna pattern is determined on the two substrates. An example of a method that enables stable power transmission and data transfer by arranging various components at different locations will be described.

FIG. 1 is a schematic configuration diagram of a rotation axis sensor reading device according to the present invention.
The rotary shaft sensor reading device is composed of a rotary shaft 101, a shaft fixed substrate 103, an external fixed substrate 104, and a sensor measuring unit 105 attached to the rotary shaft 101. The rotary shaft 101 has a circular shape with a hole in the vertical center. A fixed shaft substrate 103 which is a substrate is attached, and similarly, the external fixed substrate 104 which is a circular substrate having a hole in the vertical center is attached.

  Since the shaft fixing substrate 103 is fixed to the rotating shaft 101, it rotates together with the sensor measuring unit 105 together with the rotating shaft. The external fixed substrate 104 is not rotated because there is a gap between the rotary shaft 101 and the external fixed substrate 104 is fixed to the outside of the rotary shaft 101. The fixing method to the outside is not limited as long as the positional relationship with the shaft fixing substrate 103 can be kept parallel.

  As an example of the attached sensor measurement unit 105, a strain gauge, a thermometer, a disconnection detection wire, or the like can be considered. This makes it possible to acquire data such as torque, axial force, strain, temperature, and the presence or absence of fracture.

  On the fixed axis substrate 103, the antenna pattern 121 is arranged as shown in the figure with respect to the donut-shaped substrate perpendicular to the axis, and the same antenna pattern 121 is arranged symmetrically with respect to the point. The various electronic components 122 are arranged to be point-symmetric.

  On the external fixed substrate 104, the antenna pattern 121 is arranged in a semicircular donut shape as shown in the figure, and various electronic components 122 are arranged at predetermined locations as shown in the figure, so that the sensor measurement unit 105 can obtain the antenna pattern 121. The measured data is received by an electronic component mounted on the fixed shaft substrate 103, and the data is transmitted wirelessly from the antenna of the rotating shaft substrate 103 to the antenna of the fixed shaft substrate, and the received data is fixed to the fixed shaft. Record on board electronic components. Alternatively, data may be transmitted to the outside via electronic components.

  FIG. 2 is a diagram showing the flow of current generated in the antenna pattern of each substrate when the rotating shaft 101 of FIG. 1 rotates. By arranging the antenna pattern on the shaft fixed substrate 103 and the external fixed substrate 104 as shown in FIG. 1, magnetic field lines are generated in the current loop. In addition, since the magnetic field lines generate current in the loops surrounding the magnetic field lines, no current is generated in the antenna by the magnetic field lines in the shaft, and stable data transfer is possible without being affected by the magnetic field lines in the shaft.

  FIG. 3 is a diagram showing the overlap of the area of the coil of the antenna portion of the fixed shaft substrate 103 and the area due to the rotation angle between the coils of the antenna portion of the external fixed substrate 104 during rotation. When arranged as shown in the figure, the coil area 301 of the shaft fixed board and the coil area 302 of the external fixed board do not depend on the rotation angle, and the coils overlap with a constant area, so that the number of magnetic lines passing therethrough does not change, Stable measurement data and power transmission can be performed.

  FIG. 4 is a diagram for explaining power transmission and data transmission on the fixed side and the rotation side. Power is supplied from the power source to the external fixed board, and the external fixed board 104 transmits the power to the shaft fixed board 103 by electromagnetic induction. The shaft fixed board acquires sensor data from the sensor measurement unit by the transmitted power and returns the sensor value to the external fixed board 104. As a result, even when the shaft-fixed substrate is rotating at high speed, power and data can be transmitted.

  FIG. 5 is a diagram showing the direction of centrifugal force during rotation applied to the shaft fixing substrate 103. By arranging the electronic components 122 on the fixed axis substrate 103 so as to be point-symmetrical so that the balance of the center of gravity matches as shown in the figure, the center of gravity of the board matches the center of gravity of the axis even if the axis is rotated as shown in the figure. Therefore, it is stable even at high speed.

  In this embodiment, a method of attaching two circular substrates having a hole in the vertical center to the rotating shaft 101 in parallel was used in parallel. However, other shapes and C-shaped substrates are not used in a circular shape. An effect can be obtained. Further, the same effect can be obtained not only in one turn in the anten pattern but also in a concentric loop shape and a spiral shape.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 101 Rotating shaft 103 Axis fixed board 104 External fixed board 105 Sensor measurement part 121 Antenna pattern 122 Electronic component 301 Axis fixed board coil area 302 External fixed board coil area

Claims (4)

An axis fixed substrate that includes an antenna pattern and is fixed to the rotation axis;
A sensor measuring unit connected to the shaft fixing substrate and installed on the rotating shaft;
A rotary shaft sensor reading device comprising: an external fixed substrate having an antenna pattern disposed at a position facing the shaft fixed substrate and fixed to the outside of the rotary shaft,
A plurality of electronic components and an antenna pattern are provided on the same plane of the shaft fixing substrate,
The antenna pattern of the fixed axis substrate and the antenna pattern of the external fixed substrate are arranged such that the overlapping area is constant during rotation,
A rotating shaft sensor reading device, wherein sensor data measured by the sensor measurement unit is transmitted from the shaft fixed substrate to the external fixed substrate through the antenna pattern. The shaft fixing substrate is fixed so as to surround the rotating shaft,
The rotation axis sensor reading device according to claim 1, wherein the antenna pattern of the axis fixed substrate is arranged point-symmetrically with respect to the center of the rotation axis.   The rotary shaft sensor reading device according to claim 1, wherein electric power is transmitted from the external fixed substrate to the shaft fixed substrate via the antenna pattern.   A plurality of electronic components are arranged on the shaft fixing substrate,
  The rotary shaft sensor reading device according to claim 2, wherein the electronic component is arranged point-symmetrically with respect to the center of the rotary shaft.

Images