JP2018096729A - Sensor coil unit for position detection device - Google Patents

Abstract

An object of the present invention is to reduce the size of a coil unit of a sensor of a rotation angle and position detection device by reducing the mounting area. In the coil unit of the present invention, a coil wire or a coil wire with a terminal or the like is routed from the side surface or the opening in the center of the magnetic core, and the input stage of the detection circuit (detection circuit such as terminals, pads, etc.) is routed from the inside direction. The mounting structure is connected to the input contact of the coil output to ). [Selection drawing] Fig. 1

Description

  The present invention relates to a measurement system including a sensor for measuring the angular position and the radial position of a rotating shaft, a magnetic bearing including the sensor, and a synchronous motor, and is particularly suitable for a high-speed rotating machine using an active magnetic bearing. The present invention relates to a measurement system, a magnetic bearing including the measurement system, and a synchronous motor.

  A high-speed rotating machine having an active magnetic bearing and driven by a synchronous motor requires six sensors corresponding to the six degrees of freedom of the rotating shaft. One is a rotation angle sensor for a synchronous motor, and the remaining five are displacement sensors for a magnetic bearing. Usually, an eddy current type or inductive gap sensor is used as a displacement sensor for a magnetic bearing. As the rotation angle sensor for the synchronous motor, a resolver, an optical sensor, an induction sensor, a capacitance sensor, and a magnetoresistive sensor are used.

Patent 3351310 Japanese Patent Application 2016-036557

  The rotation angle sensor and the position detection device sensor described in Documents 1 and 2 are composed of two eccentric sensor targets and two stator coil units. From the stator coil unit, an oscillator, an adder, a subtractor, etc. In connection to the system including the detection circuit, the arrangement requires a mounting area due to the routing of the coil wire.

  The present invention realizes downsizing of the coil unit of the sensor of the rotation angle and position detection device by saving the mounting area.

  The coil unit of the present invention includes, for example, a magnetic core and a coil mounting portion to which the coil is mounted. The coil unit has a plurality of coil mounting portions, and the magnetic core and the coil are mounted in a small size. As a structure to be obtained, the coil wire or terminal-attached coil wire is routed from the side or the opening in the center of the magnetic core, and the input stage of the detection circuit (the input contact of the coil output to the detection circuit such as the terminal and pad) from the inside direction ) To reduce the mounting space on the outside of the coil and achieve a reduction in the size of the rotation angle sensor itself.

  According to the present invention, since the coil wire can be routed inward and connected, enormous mounting area due to the coil wire routed outward can be reduced, so that downsizing can be realized.

  Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

It is a block diagram of the magnetic body core of the reference coil and sensing coil which concern on this invention. It is the side surface mounting structure of the induction coil of the magnetic body which concerns on this invention. It is the center mounting structure by the opening hole of the induction coil of the magnetic body core which concerns on this invention. 1 is a mounting structure having a PCB coil substrate of an induction coil and a drive circuit substrate by an opening hole of an induction coil of a magnetic core according to the present invention. It is a block diagram of the circuit which detects the difference of the reference coil which concerns on this invention, and a sensing coil.

  Embodiments according to the present invention will be described below with reference to the drawings. In addition, in each figure, about the part which is the same structure, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The configuration of the coil unit according to the present embodiment will be described with reference to FIGS. FIG. 1 is a configuration diagram of a coil unit 1 according to the present embodiment. In FIG. 1, a coil unit 1 includes a magnetic core 2, a reference surface 8A of an object to be measured 7, a reference coil 3 facing the sensing surface 8B, and a sensing coil 4. With respect to the bottom surface 9 of the coil unit 1, the reference surface 8 </ b> A and the sensing surface 8 </ b> B of the object 7 to be measured, the air gap 1 and the air gap 2 6 are arranged in parallel. Although not shown in the drawings, the gap 1 5 and the gap 2 6 depend on, for example, the angular position of the object 7 when the object 7 is rotated when the object 7 is a rotating body having an eccentric or elliptical structure. The gap 1 5 and the gap 2 6 have structures that change to the same gap and a gap having a difference. The gap 1 5 and the gap 2 6 are made of a material having a low magnetic permeability such as space, resin, nonmagnetic glass, nonmagnetic ceramics, and nonmagnetic metal.

  The magnetic core 9 with slits in FIG. 2 has a shape with side slits 9A, 9B, 9C, 9D. FIG. 2A shows a configuration in which the reference coil 3 and the sensing coil 4 wound around the side slit magnetic core 9 are mounted on the housing 12. The reference coil and the sensing coil wire 11 are connected to the side slits 9A, 9B, 9C, and 9D. In other words, the connector terminal 10 is connected with solder or the like. FIG. 2B shows a structure in which the reference coil and the sensing coil wire 11 are caulked to a terminal of a harness 13 such as a connector terminal and connected by welding, soldering, or the like. Although not shown, a structure may be adopted in which coil wires with terminals are connected to the tips of the coil wires of the reference coil 3 and the sensing coil 4 and are connected to a connection portion of the harness 13 such as a connector by press fitting or the like.

  FIG. 3 shows a structure in which an opening type magnetic body core A14 and an opening type magnetic body core B15 provided with opening holes 14A and 15A in the center are mounted on the housing 12 with respect to the magnetic core 9 of FIG. Note that the shape of the opening hole is not limited to the shape of 14A and 15A when the reference coil and the sensing coil wire 11 are mounted at the time of mounting, and the opening is for mounting with a single or a plurality of openings. It becomes a suitable shape. FIG. 3A shows a configuration in which the reference coil 3 and the sensing coil 4 wound around the magnetic core 14 are mounted on the housing 12, and the reference coil and the sensing coil wire 11 are wound around the opening hole 14 </ b> A to connect the connector terminal 10. It is the structure connected to soldering etc. 3 (a) may be connected to the harness 13 as shown in FIG. 2 (b).

  FIG. 3B shows a configuration in which the reference coil 3 and the sensing coil 4 wound around the magnetic core 15 are mounted on the housing 12, and an insulating plate 16 such as a ceramic is provided between the connector terminal 17 and the magnetic core 15. Thus, the connector terminal 17 is passed through the opening hole 15A and connected to the reference coil 3 and the coil wire 11 of the sensing coil 4 at the bottom of the housing 12 with solder or the like. Compared to FIG. By connecting the coil wires from the inner direction of 15, the enormous mounting area in the outer direction is reduced, so that the size is reduced and the structure is made compact.

  4 (a) uses the magnetic core 15 of FIG. 3 (b) to insert the magnetic core 15 into the reference and sensing PCB coil substrate 20 arranged at the bottom of the housing 12, In this structure, an insulating plate 19 is provided between the PCB coil substrate 20 and the detection circuit substrate 18 through the opening hole 15A.

  FIG. 4B shows the magnetic core 21 placed on the reference and sensing PCB coil substrate 20 disposed at the bottom of the housing 12 by using the non-open magnetic core 24 without the opening hole 15A shown in FIG. The insulating plate 22 is inserted between the detection circuit board 23 and the PCB coil board 20 and the detection circuit board 23 are connected to each other at the side surface of the magnetic core 21 through the connection terminals 23A. 4 (a) and 4 (b), the position of the connection terminal 23A for connecting the PCB coil board 20 and the detection circuit board 23 is not limited to the position shown in FIGS. 4 (a) and 4 (b). In addition, the influence of the PCB coil shape of the coil substrate 20 is great, and the configuration can be changed in terms of mountability and mountability.

  5 shows an example of the detection circuit of the detection circuit boards 18 and 23, and the connection of the reference coil 3 and the sensing coil 4 and the detection circuit of FIG. 2 to FIG. Reference numeral 24 </ b> C is a connection point, and a region 24 represents the coil unit 1.

    The reference coil 3 and the sensing coil 4 are configured as a bridge circuit 106 by a resistor 104A, a resistor 104B, and a reference-sensing coil balance adjustment volume 105.

    The bridge circuit 106 receives AC excitation from the oscillator 101 located upstream. The inductances of the reference coil 8A and the sensing coil 8B change due to the gaps 7A and 7B between the measured object 4 and the impedance, respectively. The intermediate voltage between the impedance of the reference coil 8A and the impedance of the sensing coil 8B, and the combined voltage of the resistors 104A and 104B and the reference-sensing coil balance adjustment volume 105 is input to the operational amplifier 107 of the differential amplifier circuit 108. The difference is detected.

    The output of the operational amplifier 108 is input to the operational amplifier 109 of the detection circuit 111 that receives and detects the synchronization signal 110 from the oscillator 101. The output of the operational amplifier 109 is input to the operational amplifier 115 of the offset circuit 116 that offsets the output 117 together with the voltage obtained by dividing the reference voltage 112 by the resistor 113 and the offset adjustment volume 114.

    With the above circuit configuration, the reference-sensing coil balance adjustment volume 105 adjusts the output of the operational amplifier 107 to 0 at an arbitrary position of the DUT 7, and the reference coil 8 </ b> A and the sensing coil 8 </ b> B are adjusted. Individual variation can be canceled. Further, the output 117 can be adjusted by adjusting the offset adjustment volume 114 of the offset circuit 116, the frequency adjustment volume 102, and the gain adjustment volume 103 of the oscillator 101.

  In addition, this invention is not limited to each above-mentioned Example, Various modifications, such as a single or multiple coil, 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. In addition, a part of the configuration of one embodiment or modification can be replaced with the configuration of another embodiment or modification, and the configuration of another embodiment or modification can be replaced with the configuration of one embodiment or modification. It is also possible to add a configuration. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment or modification.

DESCRIPTION OF SYMBOLS 1 ... Coil unit 2,21 ... Magnetic body core 3 ... Reference coil 4 ... Sensing coil 5 ... Air gap 1
6 ... Gap 2
7 ... object to be measured 8A ... reference surface 8B ... sensing surface 9 ... magnetic core with slits 9A, 9B, 9C, 9D ... side slits 10, 17 ... terminal connector 11 ... coil wire 12 ... housing 13 ... harness 14 ... opening type Magnetic core A
14A, 15A ... Opening hole 15 ... Opening type magnetic core B
16, 19, 22 ... Insulating plate 18, 23 ... Detection circuit board 20 ... PCB coil board 23A ... Connection terminal 24 ... Connection area 24A, 24B, 24C ... Connection point 100 ... Detection circuit 101 ... Oscillator 102 ... Frequency adjustment volume 103 ... Gain adjustment volume 104A ... resistance 1
104B ... resistance 2
105: Reference-Sensing coil balance adjustment volume 106 ... Bridge circuit 107 ... Operational amplifier 1
108: Differential amplifier circuit 109: Operational amplifier 2
DESCRIPTION OF SYMBOLS 110 ... Synchronization signal 111 ... Detection circuit 112 ... Reference voltage 113 ... Resistance 114 ... Offset adjustment volume 115 ... Operational amplifier 3
116: Offset circuit 117 ... Output

Claims (4)

A coil unit attached to a device under test with a predetermined gap,
The magnetic core of the sensor for detecting the object to be measured is a coil unit having a structure in which an induction coil is wound from a side slit portion of the magnetic core and connected to a signal input stage such as a connection terminal of a detection circuit or a harness . A coil unit attached to a device under test with a predetermined gap,
The magnetic core of the sensor for detecting the object to be measured is a coil unit having a structure in which an induction coil is wired from an opening of the magnetic core with an opening and connected to a signal input stage such as a connection terminal or a harness. . The coil unit according to claim 2,
The structure has a structure in which the detection circuit board is connected to the PCB coil substrate or the like in which the magnetic core is inserted at the bottom of the housing on which the magnetic core is mounted through the connection terminal through the opening of the magnetic core with the opening. Coil unit. The coil unit according to claim 2,
The structure is a coil unit having a structure in which a PCB coil board having a magnetic core inserted therein and a drive circuit board are connected to each other through a connection terminal on a side surface of the magnetic core at the bottom of a housing on which the magnetic core is mounted.

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