JP2008253125A - Rolling bearing device having dimension direction plane arrangement structure of composite resolver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device suitable for preventing erroneous detection of a rotary sensor if a moment load is applied. <P>SOLUTION: A thin motor 100 includes a cross-roller bearing 14 having an inner wheel 14a and an outer wheel 14b, a stator 22 supported by the inner wheel 14a, a rotor 12 supported by the outer wheel 14b, a motor unit 16 for providing a rotary torque to the rotor 12, a unipolar resolver 30 for detecting a rotary angle position of the rotor 12, a multipolar resolver 30, an oscillator 61 for outputting an excitation signal, and a changeover switch 63 for switching a supply route of the excitation signal to be supplied from the oscillator 61 to the resolver 30 so that the excitation signal can be supplied to a resolver alternatively selected from among the two resolver 30. The resolvers 30, the cross-roller bearing 14 and the motor unit 16 are disposed on the same plane of a diameter direction in this order from the inside in the diameter direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling bearing device including a rolling bearing and a rotation sensor, and more particularly to a rolling resolver having a radial planar arrangement structure of a composite resolver suitable for preventing erroneous detection of the rotation sensor when a moment load is applied. The present invention relates to a bearing device.

Conventionally, as a thin motor, a thin motor including a rolling bearing and a rotation sensor is known.
FIG. 16 is a sectional view in the axial direction of a conventional thin motor 200.
As shown in FIG. 16, the thin motor 200 includes a housing inner 220 that is a stator, a rotor 12 that is a rotor, and a cross that is interposed between the rotor 12 and the housing inner 220 to rotatably support the rotor 12. And a roller bearing 14.

  The cross roller bearing 14 has an inner ring 14a and an outer ring 14b. The inner ring 14a is fitted to the outer peripheral surface of the housing inner 220, and is fixed to the housing inner 220 in a state of being pressed in the axial direction by the inner ring presser 26. The outer ring 14 b is fitted to the inner peripheral surface of the rotor 12 and is fixed to the rotor 12 while being pressed in the axial direction by the outer ring presser 28.

Between the rotor 12 and the housing inner 220, a motor unit 16 that applies rotational torque to the rotor 12 and a resolver 30 as a rotation sensor that detects the rotational angle position of the rotor 12 are provided.
The resolver 30 is disposed so as to be opposed to the resolver rotor 18 at a predetermined interval with an annular resolver rotor 18 having an inner periphery that is eccentric with respect to the axis of the cross roller bearing 14, and the reluctance between the resolver rotor 18 and the resolver rotor 18. And a resolver stator 20 for detecting a change. The resolver rotor 18 is integrally attached to the inner peripheral surface of the rotor 12, and the resolver stator 20 is integrally attached to the outer peripheral surface of the housing inner 220. By causing the resolver rotor 18 to be eccentric and changing the distance between the resolver rotor 18 and the resolver stator 20 in the circumferential direction, the reluctance changes depending on the position of the resolver rotor 18. Therefore, since the fundamental wave component of the reluctance change per rotation of the rotor 12 is one cycle, the resolver 30 outputs a resolver signal that changes according to the rotation angle position of the rotor 12.

In addition, as a conventional rolling bearing apparatus, the bearing apparatus of patent documents 1-3 is known, for example. The bearing device described in Patent Document 1 is one in which an axial preload is applied and the inner ring 14a and the outer ring 14b are fixed, and the bearing device described in Patent Document 2 has a bearing operating point set outside the output shaft. In the bearing device described in Patent Document 3, a motor is arranged on the outer periphery of the bearing.
JP 2005-69252 A JP 2006-25525 A JP 2002-281720 A

  However, in the conventional thin motor 200, when a moment load is applied to the thin motor 200, the thin motor 200 is tilted about the cross roller bearing 14 and the gap of the resolver 30 changes. Therefore, there has been a problem that the rotational angle position of the rotor 12 cannot be accurately detected. In particular, since the tilt is centered on the cross roller bearing 14, the gap change increases as the distance from the cross roller bearing 14 increases. Moreover, since it is a thin motor, it must receive a moment load with one cross roller bearing 14, and it is difficult to increase the number of cross roller bearings 14 to increase rigidity and prevent a gap change.

  Therefore, the present invention has been made paying attention to such an unsolved problem of the conventional technology, and is a composite suitable for preventing erroneous detection of a rotation sensor when a moment load is applied. An object of the present invention is to provide a rolling bearing device having a radial planar arrangement structure of a resolver.

  [Invention 1] In order to achieve the above object, a rolling bearing device having a radial planar arrangement structure of a composite resolver of Invention 1 includes a rolling bearing having an inner ring and an outer ring, an inner ring supported body supported by the inner ring, and A rolling bearing device comprising: an outer ring supported body supported by the outer ring; and a rotation sensor that is disposed between the inner ring supported body and the outer ring supported body and outputs a sensor signal that varies depending on a relative position thereof. The rotation sensor and the rolling bearing are arranged on the same radial plane, and the rotation sensor is a fundamental component of a reluctance change that changes in synchronization with the rotation of the inner ring supported body or the outer ring supported body. The first resolver that outputs the sensor signal having a first period, and the sensor signal that has a fundamental wave component of the reluctance change having a second period different from the first period. The excitation signal is supplied to an oscillator that outputs an excitation signal, and a resolver that is alternatively selected from the first resolver and the second resolver. Switching means for switching a supply path of excitation signals supplied from the oscillator to the first resolver and the second resolver.

With such a configuration, the inner ring supported body and the outer ring supported body are relatively rotatably supported by the rolling bearing.
When a moment load is applied to the rolling bearing device, the rolling bearing device tilts around the rolling bearing, but the rotation sensor is arranged on the same plane in the radial direction as the rolling bearing, so the gap change of the rotation sensor can be reduced. it can.

Further, since the rotation sensor and the rolling bearing are arranged on the same radial plane, the height (axial length) of the rolling bearing device can be reduced.
Furthermore, when a method such as increasing the preload of the rolling bearing is adopted, the gap change can be suppressed, but on the other hand, there is a problem that the life of the rolling bearing is shortened. Since the gap change is reduced by disposing the roller, the life of the rolling bearing can be extended.

  On the other hand, when the supply path is switched by the switching means so that the excitation signal is supplied to the first resolver, the reluctance changes in synchronization with the rotation of the inner ring supported body or the outer ring supported body, and the fundamental wave of the reluctance change. A sensor signal whose component is in the first period is output from the first resolver. Further, when the supply path is switched so that the excitation signal is supplied to the second resolver by the switching means, the reluctance changes in synchronization with the rotation of the inner ring supported body or the outer ring supported body, and the fundamental wave of the reluctance change. A sensor signal whose component is in the second period is output from the second resolver. Therefore, since the first resolver and the second resolver are not excited at least simultaneously, the leakage flux of one of the first resolver and the second resolver does not magnetically interfere with the other.

  Here, the inner ring supported body and the outer ring supported body only need to be relatively rotatably supported by the rolling bearing, and the inner ring supported body is fixed and the outer ring supported body is rotatably supported. Alternatively, the outer ring supported body may be fixed and the inner ring supported body may be rotatably supported, or both may be rotatably supported. Hereinafter, the same applies to the rolling bearing device having the radial planar arrangement structure of the composite resolver of the invention 2.

  [Invention 2] Further, a rolling bearing device having a radial planar arrangement structure of the composite resolver of Invention 2 includes a rolling bearing having an inner ring and an outer ring, an inner ring supported body supported by the inner ring, and an outer ring supported by the outer ring. The outer ring supported body, the inner ring supported body and the driving body for relatively rotating the outer ring supported body, and the inner ring supported body and the outer ring supported body. In a rolling bearing device comprising a rotation sensor that outputs a sensor signal that changes, the rotation sensor, the rolling bearing, and the driving body are arranged on the same plane in the radial direction in that order from the radial inner side, and the rotation sensor The first resolver that outputs the sensor signal in which the fundamental wave component of the reluctance change that changes in synchronization with the rotation of the inner ring supported body or the outer ring supported body has a first period. And a second resolver that outputs the sensor signal in which the fundamental wave component of the reluctance change has a second period different from the first period, and further includes an oscillator that outputs an excitation signal, the first resolver, and the And switching means for switching a supply path of excitation signals supplied from the oscillator to the first resolver and the second resolver so that the excitation signal is supplied to a resolver selected from the second resolver. Is provided.

With such a configuration, the inner ring supported body and the outer ring supported body are relatively rotatably supported by the rolling bearing.
When a moment load is applied to the rolling bearing device, the rolling bearing device tilts around the rolling bearing, but the rotation sensor is arranged on the same plane in the radial direction as the rolling bearing, so the gap change of the rotation sensor can be reduced. it can.

In addition, since the rotation sensor, the rolling bearing, and the driving body are disposed on the same plane in the radial direction, the height (axial length) of the rolling bearing device can be reduced.
Furthermore, since the rotation sensor is arranged on the opposite side of the driving body with the rolling bearing interposed therebetween, the rotation sensor is hardly affected by noise and heat from the driving body.
Furthermore, when a method such as increasing the preload of the rolling bearing is adopted, the gap change can be suppressed, but on the other hand, there is a problem that the life of the rolling bearing is shortened. Since the gap change is reduced by disposing the roller, the life of the rolling bearing can be extended.

On the other hand, when the supply path is switched by the switching means so that the excitation signal is supplied to the first resolver, the reluctance changes in synchronization with the rotation of the inner ring supported body or the outer ring supported body, and the fundamental wave of the reluctance change. A sensor signal whose component is in the first period is output from the first resolver. Further, when the supply path is switched so that the excitation signal is supplied to the second resolver by the switching means, the reluctance changes in synchronization with the rotation of the inner ring supported body or the outer ring supported body, and the fundamental wave of the reluctance change. A sensor signal whose component is in the second period is output from the second resolver. Therefore, since the first resolver and the second resolver are not excited at least simultaneously, the leakage flux of one of the first resolver and the second resolver does not magnetically interfere with the other.
Here, for example, an actuator such as a motor or an engine corresponds to the driving body.

  [Invention 3] Further, the rolling bearing device having the radial planar arrangement structure of the composite resolver of Invention 3 is the rolling bearing device having the radial plane arrangement structure of the composite resolver of Invention 2, wherein the inner ring supported body and the outer ring are provided. The supported body has an inner wall body and an outer wall body formed inside and outside in the radial direction, and the inner wall body of the inner ring supported body is between the inner wall body and the outer wall body of the outer ring supported body. The outer wall body of the body is disposed so as to be located between the inner wall body and the outer wall body of the inner ring supported body, and the inner wall body of the outer ring supported body and the inner wall body of the inner ring supported body The rotation sensor detection body is fixed to the rotation sensor detection means on the other side, the inner ring is fixed to the inner wall body of the inner ring supported body, the outer ring is fixed to the outer wall body of the outer ring supported body, and the outer ring Outer wall body and front of supported body The rotor of the drive member on one of the outer wall of the inner ring supported member, to fix the stator of the drive member to the other.

  With such a configuration, when the rotor of the driving body is fixed to the outer wall body of the outer ring supported body, the outer ring supported body and the outer ring rotate, and the outer wall body of the inner ring supported body rotates to the outer wall body of the driving body. When the rotor is fixed, the inner ring supported body and the inner ring rotate. When they rotate, the detected body of the rotation sensor fixed to one of the inner wall body of the outer ring supported body and the inner wall body of the inner ring supported body is detected by the detection means of the rotation sensor fixed to the other. Thus, a sensor signal that changes depending on the relative position between the inner ring supported body and the outer ring supported body is output from the rotation sensor.

Here, the inner wall body or the outer wall body of the inner ring supported body may be configured integrally with the inner ring supported body, or may be configured separately from the inner ring supported body. When configured as a separate body, a member such as an inner ring presser may constitute the inner wall body of the inner ring supported body.
Further, the inner wall body or the outer wall body of the outer ring supported body may be formed integrally with the outer ring supported body, or may be formed separately from the outer ring supported body. When configured as a separate body, a member such as an outer ring presser may constitute the outer wall body of the outer ring supported body.

  Further, in order to fix to the inner wall body or the outer wall body (hereinafter abbreviated as “wall body” in this paragraph), the wall body is not directly fixed, but is arranged close to or in contact with the wall body, And the fixed state which makes a wall body substantially integral by being fixed to the member to which a wall body is fixed, or the member integral with a wall body is included.

[Invention 4] Furthermore, the rolling bearing device having the radial planar arrangement structure of the composite resolver according to Invention 4 is the rolling bearing device having the radial plane arrangement structure of the composite resolver according to any one of Inventions 1 to 3. The bearing is a cross roller bearing or a four-point contact ball bearing.
With such a configuration, moment load, axial load and radial load can be simultaneously received.

  [Invention 5] Further, the rolling bearing device having the radial planar arrangement structure of the composite resolver according to Invention 5 is the rolling bearing device having the radial planar arrangement structure of the composite resolver according to any one of Inventions 1 to 4. One resolver includes a first resolver stator and a first resolver rotor, and a reluctance between the first resolver rotor and the second resolver stator varies depending on a position of the first resolver rotor, and the first resolver rotor A single-pole resolver that outputs the sensor signal in which the fundamental wave component of the reluctance change is one cycle per one rotation; the second resolver includes a second resolver stator and a second resolver rotor; and the second resolver The reluctance between the rotor and the second resolver stator varies depending on the position of the second resolver rotor. The fundamental wave component of the reluctance change per revolution of the second resolver rotor is multipolar resolver that outputs the sensor signal as a multi-cycle.

  With this configuration, when the supply path is switched by the switching means so that the excitation signal is supplied to the first resolver, the first resolver rotor is synchronized with the rotation of the inner ring supported body or the outer ring supported body. And the reluctance between the first resolver rotor and the first resolver stator is changed by this rotation. And the sensor signal from which the fundamental wave component of the reluctance change becomes 1 period per 1 rotation of a 1st resolver rotor is output from a 1st resolver.

In the unipolar resolver, the influence of the gap change due to the moment load is particularly large. Therefore, the reduction of the gap change is effective in preventing erroneous detection.
Further, when the supply path is switched by the switching means so that the excitation signal is supplied to the second resolver, the second resolver rotor rotates in synchronization with the rotation of the inner ring supported body or the outer ring supported body. Thus, the reluctance between the second resolver rotor and the second resolver stator changes. And the sensor signal from which the fundamental wave component of a reluctance change becomes multi-cycle per rotation of a 2nd resolver rotor is output from a 2nd resolver.

[Invention 6] Further, the rolling bearing device having the radial planar arrangement structure of the composite resolver according to Invention 6 is the rolling bearing device having the radial planar arrangement structure of the composite resolver according to any one of Inventions 1 to 4. The first resolver has a first resolver rotor, the second resolver has a second resolver rotor, and the first resolver rotor and the second resolver rotor are arranged at a minute interval via a rotor spacer. It is attached by two fixing means.
With such a configuration, the first resolver rotor and the second resolver rotor are independently fixed by the two fixing means.

[Invention 7] Further, the rolling bearing device having the radial planar arrangement structure of the composite resolver of the invention 7 is the rolling bearing device having the radial plane arrangement structure of the composite resolver of any one of the inventions 1 to 6, wherein the inner ring In the supported body, a wiring pipe that penetrates from the radially inner side to the radially outer side of the inner ring supported body and accommodates the wiring of the rotation sensor is formed, and the height D of the wiring pipe is determined by the rotation sensor. Assuming that the diameter of one of the wirings is d and the predetermined margin is α (0 <α <d), the value obtained by D = 2d + α is set.
With such a configuration, the height of the wiring pipe is reduced. Further, one cross is allowed for a plurality of wires of the rotation sensor.

[Invention 8] Further, the rolling bearing device having the radial planar arrangement structure of the composite resolver of Invention 8 is the rolling bearing device having the radial plane arrangement structure of the composite resolver of any one of Inventions 1 to 7, An inner ring presser for fixing the inner ring to the inner ring supported body in the axial direction is provided, and the inner ring presser is formed with a bolt hole in the axial direction for inserting a bolt for fixing the inner ring presser. The wall thickness ti of the outer peripheral surface and the inner wall surface of the bolt hole was set to a value in the range of pi <ti <2pi, where the length of one pitch of the bolt hole is pi.
With such a configuration, when a bolt is screwed into the bolt hole of the inner ring presser, the outer peripheral surface of the inner ring presser is pushed out to the inner ring side, and the inner ring is locked, so that the inner ring can be fixed without a gap.

[Invention 9] Further, the rolling bearing device having the radial plane arrangement structure of the composite resolver of the invention 9 is the rolling bearing device having the radial plane arrangement structure of the composite resolver of any one of the inventions 1 to 8, An outer ring presser for fixing the outer ring to the outer ring supported body in the axial direction is provided, and the outer ring presser is formed with a bolt hole for inserting a bolt for fixing the outer ring presser in the axial direction. The wall thickness to of the inner peripheral surface and the inner wall surface of the bolt hole was set to a value in the range of po <to <2po, where the length of one pitch of the bolt hole is po.
With such a configuration, when a bolt is screwed into the bolt hole of the outer ring presser, the inner peripheral surface of the outer ring presser is pushed out to the outer ring side and the outer ring is locked, so that the outer ring can be fixed without a gap.

  [Invention 10] Further, the rolling bearing device having the radial planar arrangement structure of the composite resolver of Invention 10 is the rolling bearing device having the radial plane arrangement structure of any one of Inventions 1 to 7 and 9, Furthermore, an inner ring presser that fixes the inner ring to the inner ring supported body in the axial direction is provided, and the rotation sensor, the inner ring presser, and the rolling bearing are arranged on the same plane in the radial direction in that order from the radially inner side, The height H of the pressing portion of the inner ring presser was set to a value obtained by H = 1 / 2B, where B is the height of the rolling bearing.

  With such a configuration, it is possible to prevent the inner ring presser from being inclined to the rotation sensor side, so that the gap of the rotation sensor is unlikely to change.

  As described above, according to the rolling bearing device having the radial planar arrangement structure of the composite resolver of aspect 1, the rotation sensor is arranged at a position where the gap change is small even when a moment load is applied to the rolling bearing device. Therefore, compared to the conventional case, the change in the gap of the rotation sensor can be reduced, and the possibility that the rotation sensor can be erroneously detected can be reduced. Further, since the rotation sensor and the rolling bearing are arranged on the same plane in the radial direction, an effect that the height of the rolling bearing device can be reduced is also obtained. Furthermore, the effect that the life of the rolling bearing can be extended can be obtained as compared with a method of increasing the preload of the rolling bearing. Furthermore, since the leakage magnetic flux of one of the first resolver and the second resolver does not interfere magnetically with the other, the first resolver and the second resolver can be disposed close to each other, and the rolling bearing device has a high height. There is also an effect that the thickness can be further reduced.

  Furthermore, according to the rolling bearing device having the radial planar arrangement structure of the composite resolver of the invention 2, even if a moment load is applied to the rolling bearing device, the rotation sensor is arranged at a position where the gap change is small. In comparison, the change in the gap of the rotation sensor can be reduced, and the effect that the possibility of erroneous detection by the rotation sensor can be reduced is obtained. In addition, since the rotation sensor, the rolling bearing, and the driving body are arranged on the same plane in the radial direction, an effect that the height of the rolling bearing device can be reduced is also obtained. In addition, since the rotation sensor is arranged on the opposite side of the drive body with the rolling bearing interposed therebetween, the rotation sensor is hardly affected by noise and heat from the drive body, and an effect that high detection accuracy can be realized. can get. Furthermore, the effect that the life of the rolling bearing can be extended can be obtained as compared with a method of increasing the preload of the rolling bearing. Furthermore, since the leakage flux of one of the first resolver and the second resolver does not magnetically interfere with the other, the first resolver and the second resolver can be disposed close to each other. There is also an effect that the thickness can be further reduced.

Furthermore, according to the rolling bearing device having the radial planar arrangement structure of the composite resolver of the invention 4, since moment load, axial load and radial load can be simultaneously received, while maintaining rigidity against the axial load and radial load, It is possible to reduce the gap change due to the moment load.
Furthermore, according to the rolling bearing device having a radial planar arrangement structure of the composite resolver of the invention 6, the first resolver rotor and the second resolver rotor can be independently fixed, so the first resolver rotor and the second resolver rotor. The effect that each of the positions in the axial direction can be adjusted is obtained.

  Furthermore, according to the rolling bearing device having the radial planar arrangement structure of the composite resolver of the invention 7, since the height of the wiring pipe is reduced, an effect that the height of the rolling bearing device can be reduced is obtained. In addition, since one cross is allowed for a plurality of wirings of the rotation sensor, it is possible to reduce the possibility that the workability of accommodating the wiring of the rotation sensor in the wiring pipe is reduced.

Furthermore, according to the rolling bearing device having the radial planar arrangement structure of the composite resolver according to the eighth aspect of the invention, the inner ring can be fixed without a gap, so that the detection accuracy can be improved.
Furthermore, according to the rolling bearing device having the radial planar arrangement structure of the composite resolver according to the ninth aspect of the invention, the outer ring can be fixed without a gap, so that the detection accuracy can be improved.

  Furthermore, according to the rolling bearing device having the radial planar arrangement structure of the composite resolver according to the tenth aspect, it is possible to reduce the possibility that the gap of the rotation sensor changes, and therefore, the possibility that the rotation sensor erroneously detects. The effect that it can be obtained.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 are diagrams showing a first embodiment of a rolling bearing device having a radial planar arrangement structure of a composite resolver according to the present invention.
First, the configuration of a thin motor 100 to which the present invention is applied will be described.

FIG. 1 is a sectional view in the axial direction of a thin motor 100 according to the present embodiment.
As shown in FIG. 1, the thin motor 100 includes a stator 22 that is a stator, a rotor 12 that is a rotor, and a cross roller bearing that is interposed between the rotor 12 and the stator 22 to rotatably support the rotor 12. 14, a motor unit 16 that applies rotational torque to the rotor 12, and a resolver 30 that detects a rotational angle position of the rotor 12. Here, the resolver 30, the cross roller bearing 14, and the motor part 16 are arrange | positioned on the same plane of radial direction in the order from radial inside.

  The stator 22 is formed with an annular inner wall body 22a protruding upward in the axial direction (upward in FIG. 1), and an annular outer wall body protruding upward in the axial direction on the outer side in the radial direction than the inner wall body 22a. 22b is formed. On the other hand, the rotor 12 is formed with an annular inner wall body 12a protruding downward in the axial direction (downward in FIG. 1), and the annular wall protruding downward in the axial direction is formed radially outward from the inner wall body 12a. An outer wall body 12b is formed. The stator 22 and the rotor 12 include an inner wall 22a of the stator 22 between the inner wall 12a and the outer wall 12b of the rotor 12, and an outer wall 12b of the rotor 12 between the inner wall 22a and the outer wall 22b of the stator 22. They are arranged so as to be positioned.

The cross roller bearing 14 includes an inner ring 14a, an outer ring 14b, and a plurality of cross rollers (rollers) 14c provided so as to be able to roll between the inner ring 14a and the outer ring 14b. The cross roller 14c has a substantially cylindrical shape whose diameter is slightly larger than the length, and the even-numbered rotation shaft on the track and the odd-numbered rotation shaft on the track are inclined by 90 °.
The inner ring 14 a is fixed to the inner wall body 22 a of the stator 22 while being pressed in the axial direction. Specifically, the upper end of the inner wall body 22a of the stator 22 is brought into contact with the lower surface of the inner ring 14a, the pressing portion 26b of the inner ring presser 26 is brought into contact with the upper surface of the inner ring 14a, and the inner ring presser 26 is connected to the inner wall of the stator 22 with a bolt 26a. It is fixed by fastening to the body 22a.

The outer ring 14b is fixed to the outer wall body 12b of the rotor 12 while being pressed in the axial direction. Specifically, the lower end of the outer wall body 12b of the rotor 12 is brought into contact with the upper surface of the outer ring 14b, the pressing portion 28b of the outer ring presser 28 is brought into contact with the lower surface of the outer ring 14b, and the outer ring presser 28 is connected to the outer wall of the rotor 12 with bolts 28a. It is fixed by fastening to the body 12b.
The stator 22 is fixed to the fixed plate 24 by bolts 24a, and the rotor 12 is fitted to the outer peripheral surface of the output shaft.

  The motor unit 16 includes a permanent magnet 16a and a coil 16b disposed to face the permanent magnet 16a with a predetermined interval. The permanent magnet 16 a is attached to the outer peripheral surface of the outer ring retainer 28, and is fixed to the outer peripheral surface of the outer wall body 12 b of the rotor 12 together with the outer ring retainer 28. On the other hand, the coil 16b is attached to the outer wall 22b of the stator 22 by a bolt 16c.

  The resolver 30 is composed of a resolver rotor 18 made of a hollow annular stratified iron core, and an annular stratified iron core that is disposed facing the resolver rotor 18 at a predetermined interval, and in which a plurality of stator poles are formed at equal intervals in the circumferential direction. It is an outer rotor type resolver configured to have a resolver stator 20. In FIG. 1, one resolver 30 (upward in the axial direction) has an annular resolver rotor 18 having an inner periphery that is eccentric with respect to the axis of the cross roller bearing 14, and the reluctance per one rotation of the resolver rotor 18. An ABS (Absolute) type unipolar resolver that outputs a unipolar resolver signal whose fundamental wave component of change is one cycle (hereinafter, the unipolar resolver 30 in the resolver 30 is referred to as “unipolar resolver 30”). ). The other resolver 30 (downward in the axial direction) has a resolver rotor 18 in which a plurality of salient pole-shaped teeth are formed at equal intervals in the circumferential direction, and the fundamental wave component of the reluctance change per revolution of the resolver rotor 18. It is an INC (Increment) type multipolar resolver (hereinafter referred to as “multipolar resolver 30” when referring to a multipolar resolver in the resolver 30) that outputs a multipolar resolver signal having a multi-cycle.

  The resolver rotors 18 of the two resolvers 30 are arranged at a minute interval via a rotor spacer 42 and are attached to the outer peripheral surface of the inner wall body 12a of the rotor 12 by bolts 18a. On the other hand, the resolver stator 20 of the two resolvers 30 is disposed with a small gap through a stator spacer 44 and is attached to the inner peripheral surface of the inner ring retainer 26 by bolts 20a. It is fixed to the inner peripheral surface side of the body 22a.

Next, the configuration of the control system for the thin motor 100 will be described.
FIG. 2 is a block diagram showing the configuration of the control system for the thin motor 100.
As shown in FIG. 2, the control system includes a part of a drive unit 70 that controls the thin motor 100.
The drive unit 70 supplies an excitation signal to one of the single-pole resolver 30 and the multi-pole resolver 30, takes in the resolver signal, outputs a digital angle signal φ, and generates a rotation angle position signal from the digital angle signal φ. The CPU 71 is configured to supply power to the thin motor 100 via the power amplifier 72.

The servo driver 60 amplifies the excitation signal output from the oscillator 61 to an appropriate signal level by the amplifier 62, and connects the common terminal COM 1 of the unipolar resolver 30 and the common terminal COM 2 of the multipolar resolver 30 via the changeover switch 63. On the other hand, the excitation signal is supplied by switching the supply path of the excitation signal.
The change-over switch 63 is a switching means that is arranged on the excitation signal supply path from the oscillator 61 to the single-pole resolver 30 and the multi-pole resolver 30 and switches the supply path of the excitation signal to the single-pole resolver 30 and the multi-pole resolver 30. . The connection switching of the selector switch 63 to the common terminals COM1 and COM2 is controlled by a switch switching signal output from the CPU 71.

  Immediately after the power is turned on and the system is started, the CPU 71 supplies the excitation signal to the unipolar resolver 30 by switching the switch 63 to the common terminal COM1. The current signal output from the unipolar resolver 30 is converted into an ABS signal by the current / voltage converter 51a, and then converted into a two-phase signal (sin signal, cos signal) by the 3/2 phase converter 52a. It is supplied to the switch 53.

  On the other hand, after the CPU 71 acquires the value of the digital angle signal φ (abs described later) from the ABS signal, the CPU 71 supplies the excitation signal to the multipolar resolver 30 by switching the switch 63 to the common terminal COM2. To do. The current signal output from the multipolar resolver 30 is converted into an INC signal by the current / voltage converter 51b, and then converted into a two-phase signal (sin signal, cos signal) by the 3/2 phase converter 52b. It is supplied to the switch 53.

  The analog switch 53 is a switch element that is controlled to be switched by an ABS / INC switching signal from the CPU 71, and selectively passes one of a two-phase ABS signal and a two-phase INC signal to receive an RDC (Resolver Digital Converter) 54. To supply. The CPU 71 performs an analog operation so that the timing at which the signal passing through the analog switch 53 is switched from the two-phase ABS signal to the two-phase INC signal is substantially synchronized with the timing at which the switch 63 is connected from COM1 to COM2. An ABS / INC switching signal is output to the switch 53.

The phase shifter 55 delays the phase of the excitation signal output from the oscillator 61, and synchronizes the Ref signal that is synchronized with the phase of the carrier signal of the sin signal and the cos signal of the ABS signal or INC signal converted into two phases. Supply to RDC 54.
The RDC 54 digitizes the two-phase signal supplied from the analog switch 53 and outputs a digital angle signal φ to the CPU 71. The RDC 54 outputs an analog speed signal after synchronous rectification based on the oscillation angular frequency of the oscillator 61.

Next, the operation of the present embodiment will be described.
When the coil 16b is energized, rotational torque is applied to the rotor 12, and the rotor 12 rotates.
First, when the supply path is switched by the selector switch 63 so that an excitation signal is supplied to the monopolar resolver 30, the resolver rotor 18 rotates in synchronization with the rotation of the rotor 12, and the resolver rotor 18 and resolver are rotated by this rotation. The reluctance between the stators 20 changes. Then, a monopolar resolver signal is output from the monopolar resolver 30 in which the fundamental wave component of the reluctance change is one cycle per revolution of the resolver rotor 18.

  When the supply path is switched by the selector switch 63 so that the excitation signal is supplied to the multipolar resolver 30, the resolver rotor 18 rotates in synchronization with the rotation of the rotor 12, and the resolver rotor 18 and the resolver are thereby rotated. The reluctance between the stators 20 changes. Then, a multipolar resolver signal is output from the multipolar resolver 30 in which the fundamental wave component of the change in reluctance has multiple cycles per revolution of the resolver rotor 18.

Therefore, since the monopolar resolver 30 and the multipolar resolver 30 are not excited at least simultaneously, the leakage flux of one of the monopolar resolver 30 and the multipolar resolver 30 does not magnetically interfere with the other. Further, in the unipolar resolver 30, the influence of the gap change due to the moment load is particularly large, and therefore the reduction of the gap change is effective in preventing erroneous detection.
In the control system, the rotational speed and positioning of the motor unit 16 are controlled based on a single pole resolver signal or a multipolar resolver signal.

When a moment load is applied to the thin motor 100, the thin motor 100 is tilted about the cross roller bearing 14, but the resolver 30 is arranged on the same plane in the radial direction as the cross roller bearing 14, so that the gap change of the resolver 30 is changed. Can be small.
Moreover, since the resolver 30, the cross roller bearing 14, and the motor part 16 are arrange | positioned on the radial direction same plane, the height (length of an axial direction) of the thin motor 100 can be made small.

Furthermore, since the resolver 30 is disposed on the opposite side of the motor unit 16 with the cross roller bearing 14 interposed therebetween, the resolver 30 is not easily affected by noise or heat from the motor unit 16.
Furthermore, when a method such as increasing the preload of the cross roller bearing 14 is adopted, the gap change can be suppressed, but on the other hand, the life of the cross roller bearing 14 is shortened. In the present invention, the gap change is small. Since the change in the gap is reduced by arranging the resolver 30 at the position, the life of the cross roller bearing 14 can be extended.

  In this way, in the present embodiment, the cross roller bearing 14 having the inner ring 14a and the outer ring 14b, the stator 22 supported by the inner ring 14a, the rotor 12 supported by the outer ring 14b, and the rotor 12 are provided with rotational torque. The motor unit 16 to be applied and the resolver 30 that detects the rotational angle position of the rotor 12 are provided, and the resolver 30, the cross roller bearing 14, and the motor unit 16 are arranged on the same radial plane.

  As a result, even when a moment load is applied to the thin motor 100, the resolver 30 is disposed at a position where the gap change is small. Therefore, the change in the gap of the resolver 30 can be reduced as compared with the conventional case. The possibility of erroneous detection can be reduced. Moreover, since the resolver 30, the cross roller bearing 14, and the motor part 16 are arrange | positioned on the radial direction same plane, the height of the thin motor 100 can be made small. Furthermore, the life of the cross roller bearing 14 can be extended as compared with a method of increasing the preload of the cross roller bearing 14.

  Furthermore, in the present embodiment, a unipolar resolver 30 that outputs a unipolar resolver signal in which the fundamental wave component of the reluctance change is one cycle, and a multipolar resolver signal that outputs the fundamental wave component of the reluctance change in multiple cycles are output. The multipole resolver 30, the oscillator 61 that outputs an excitation signal, and the oscillator 61 supplies the excitation signal to a resolver that is alternatively selected from the single pole resolver 30 and the multipole resolver 30. 30 and a change-over switch 63 that switches the supply path of the excitation signal supplied to the multipolar resolver 30.

Thereby, since one leakage magnetic flux of the monopolar resolver 30 and the multipolar resolver 30 does not magnetically interfere with the other, it becomes possible to arrange the monopolar resolver 30 and the multipolar resolver 30 close to each other, The height of the thin motor 100 can be further reduced.
Further, in the present embodiment, the resolver 30, the cross roller bearing 14, and the motor unit 16 are arranged on the same plane in the radial direction in that order from the radial inner side.

Thereby, since the resolver 30 is arrange | positioned on the opposite side of the motor part 16 on both sides of the cross roller bearing 14, the resolver 30 is hard to receive the influence from the noise and heat from the motor part 16, and implement | achieves high detection accuracy. Can do.
Further, in the present embodiment, the cross roller bearing 14 is employed.
As a result, the moment load, the axial load and the radial load can be simultaneously received, so that the gap change due to the moment load can be reduced while maintaining the rigidity against the axial load and the radial load.

  In the first embodiment, the cross roller bearing 14 corresponds to the rolling bearing of inventions 1 to 5, the stator 22 corresponds to the inner ring supported body of inventions 1 to 3, and the rotor 12 corresponds to inventions 1 to 5. The single pole resolver 30 corresponds to the first resolver according to the first, second, or fifth aspect. The multipolar resolver 30 corresponds to the second resolver of the invention 1, 2 or 5, the changeover switch 63 corresponds to the switching means of the invention 1 or 2, and the resolver rotor 18 corresponds to the detected object of the invention 3. Correspondingly, the resolver stator 20 corresponds to the detection means of the third aspect.

  In the first embodiment, the motor unit 16 corresponds to the driving body of the invention 2 or 3, the permanent magnet 16a corresponds to the rotor of the invention 3, and the coil 16b is the stator of the invention 3. It corresponds to.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to the drawings. 3 to 5 are views showing a second embodiment of a rolling bearing device having a radial planar arrangement structure of a composite resolver according to the present invention.

First, the configuration of the resolver 30 will be described.
FIG. 3 is a sectional view in the axial direction of the thin motor 100 according to the present embodiment.
As shown in FIG. 3, the resolver 30 is a ring-shaped resolver rotor formed of a hollow annular stratified iron core, and arranged to face the resolver rotor at a predetermined interval, and a plurality of stator poles are formed at equal intervals in the circumferential direction. It is an outer rotor type resolver comprised including the resolver stator which consists of this laminated iron core. In FIG. 3, one resolver 30 (upward in the axial direction) is disposed so as to face the resolver rotor 18 ra and an annular resolver rotor 18 ra having an inner periphery that is eccentric with respect to the axis of the cross roller bearing 14. This is an ABS type single pole resolver that has a resolver stator 20sa and outputs a single pole resolver signal in which the fundamental wave component of the reluctance change is one cycle per revolution of the resolver rotor 18ra. The other resolver 30 (downward in the axial direction) includes a resolver rotor 18ri in which a plurality of salient pole-shaped teeth are formed at equal intervals in the circumferential direction, and a resolver stator 20si disposed to face the resolver rotor 18ri. In addition, this is an INC type multipolar resolver that outputs a multipolar resolver signal in which the fundamental wave component of the reluctance change has multiple cycles per revolution of the resolver rotor 18ri.

The resolver rotors 18 ra and 18 ri are arranged with a minute interval via a rotor spacer 42. The resolver rotor 18ra is fixed and attached between the outer peripheral surface of the inner wall 12a of the rotor 12 and the upper surface of the rotor spacer 42 by bolts 18a. The resolver rotor 18ri is attached to the lower surface of the rotor spacer 42 by bolts 18b.
FIG. 4 is a bottom view of the rotor spacer 42.

FIG. 5 is an axial cross-sectional view taken along the line AOA ′ of FIG.
As shown in FIG. 4, a bolt hole 46a through which the bolt 18a is inserted and a bolt hole 46b through which the bolt 18b is inserted are formed on the lower surface of the rotor spacer 42. Six bolt holes 46a are formed at intervals of 60 ° in the circumferential direction of the rotor spacer 42, and two bolt holes 46a are formed at intervals of 15 ° counterclockwise from the bolt holes 46a immediately below FIG. The bolt holes 46b are respectively formed at 15 ° positions clockwise from the respective bolt holes 46a formed at intervals of 60 °.

As shown in FIG. 5, the bolt hole 46 a penetrates the rotor spacer 42 in the axial direction, and the counterbore depth reaches about half the axial direction of the rotor spacer 42. The depth of the bolt hole 46 b reaches about half of the axial direction of the rotor spacer 42.
On the other hand, the resolver stators 20sa and 20si are arranged at a minute interval via a stator spacer 44 as shown in FIG. The resolver stator 20sa is fixed and attached between the inner peripheral surface of the inner ring retainer 26 and the upper surface of the stator spacer 44 by a bolt 20a. The resolver stator 20si is attached to the lower surface of the stator spacer 44 by bolts 20b. Therefore, the resolver stators 20 sa and 20 si are fixed to the inner peripheral surface side of the inner wall body 22 a of the stator 22 together with the inner ring presser 26.

Next, the configuration of the stator 22 will be described.
As shown in FIG. 3, the stator 22 is formed with a wiring pipe 48 penetrating from the radially inner side of the stator 22 to the radially outer side. The wiring pipe 48 accommodates the wiring of the resolver 30.
The height D of the wiring pipe 48 is set to a value obtained by the following expression (1), where d is the diameter of one wiring of the resolver 30 and α is a predetermined margin (0 <α <d). .

D = 2d + α (1)

The wiring of the resolver 30 is composed of a plurality of wirings such as a power line and a ground line. If these wires can be arranged horizontally without twisting, the height D of the conduit can be d. However, in reality, the wires cross in the axial direction. Therefore, it is preferable to set 2d + α in consideration of one cross (d).

Next, the configuration of the inner ring presser 26 and the outer ring presser 28 will be described.
As shown in FIG. 3, the inner ring retainer 26 is formed with a bolt hole 26c through which the bolt 26a is inserted. In the first embodiment, the thickness of the outer peripheral surface of the inner ring retainer 26 and the inner wall surface of the bolt hole 26c is a thickness corresponding to the length of approximately three pitches of the bolt hole 26c. On the other hand, in the present embodiment, the wall thickness ti of the outer peripheral surface of the inner ring presser 26 and the inner wall surface of the bolt hole 26c is expressed by the following equation (2), where pi is the length of one pitch of the bolt hole 26c. Set to a range value. Therefore, when the bolt 26a is screwed into the bolt hole 26c, the outer peripheral surface of the inner ring retainer 26 is pushed out toward the inner ring 14a, and the inner ring 14a is locked, so that the inner ring 14a can be fixed without a gap. Therefore, detection accuracy can be improved.

pi <ti <2pi (2)

In the above equation (2), when the wall thickness ti is 2 pi or more, the action of pushing the outer peripheral surface of the inner ring presser 26 is reduced, and it becomes difficult to fix the inner ring 14a without a gap, while the wall thickness ti is pi or less. There is a possibility of destroying the inner wall of the bolt hole 26c. Therefore, it is preferable to set the value obtained by the above equation (2).

As shown in FIG. 3, the outer ring retainer 28 is formed with a bolt hole 28c through which the bolt 28a is inserted. In the first embodiment, the thickness of the inner peripheral surface of the outer ring retainer 28 and the inner wall surface of the bolt hole 28c is a thickness corresponding to the length of approximately three pitches of the bolt hole 28c. On the other hand, in this embodiment, the wall thickness to of the inner peripheral surface of the outer ring retainer 28 and the inner wall surface of the bolt hole 28c is expressed by the following equation (3), where the length of one pitch of the bolt hole 28c is po. Is set to a value in the range. Therefore, when the bolt 28a is screwed into the bolt hole 28c, the inner peripheral surface of the outer ring retainer 28 is pushed out to the outer ring 14b side, and the outer ring 14b is locked, so that the outer ring 14b can be fixed without a gap. Therefore, detection accuracy can be improved.

po <to <2po (3)

In the above equation (3), if the wall thickness to is 2 p0 or more, the action of pushing the inner peripheral surface of the outer ring presser 28 is reduced, and it becomes difficult to fix the outer ring 14a without a gap, while the wall thickness to is less than p0. Then, there is a possibility of destroying the inner wall of the bolt hole 28c. Therefore, it is preferable to set the value obtained by the above equation (3).

  In the first embodiment, the height of the pressing portion 26b of the inner ring presser 26 is about 1 / 4B, where B is the height of the cross roller bearing 14. However, if the height of the pressing portion 26b of the inner ring presser 26 is about 1 / 4B, the inner ring presser 26 may tilt toward the resolver 30 and the resolver 30 gap may change. Therefore, there has been a problem that the rotational angle position of the rotor 12 cannot be accurately detected.

Therefore, in the present embodiment, the height H of the pressing portion 26b of the inner ring presser 26 is set to a value obtained by the following expression (4) as shown in FIG.

H = 1 / 2B (4)

Thereby, since possibility that the gap of the resolver 30 will change can be reduced, possibility that the resolver 30 will detect incorrectly can be reduced.

The height of the pressing portion 28b of the outer ring presser 28 is 1 / 4B.
In this way, in the present embodiment, the resolver rotors 18ra and 18ri are arranged with a minute interval through the rotor spacer 42 and are attached by the two bolts 18a and 18b, respectively.
Thereby, since the resolver rotors 18ra and 18ri can be fixed independently, the position of the resolver rotors 18ra and 18ri in the axial direction can be adjusted.

Further, in the present embodiment, the resolver stators 20sa and 20si are arranged with a small interval through the stator spacer 44 and are attached by two bolts 20a and 20b, respectively.
Thereby, since the resolver stators 20sa and 20si can be independently fixed, the position of the resolver stators 20sa and 20si in the axial direction can be adjusted.

Furthermore, in the present embodiment, the resolver 30 is configured as an ABS type and INC type resolver.
Thereby, the influence of a gap change can be reduced effectively.
Furthermore, in the present embodiment, the height D of the wiring pipe 48 is set to a value obtained by the above equation (1).

Thereby, since the height of the wiring pipe 48 becomes small, the height of the thin motor 100 can be made small. Further, since one cross is allowed for the plurality of wirings of the resolver 30, it is possible to reduce the possibility that workability of housing the wiring of the resolver 30 in the wiring pipe 48 is lowered.
Further, in the present embodiment, the wall thickness ti of the outer peripheral surface of the inner ring presser 26 and the inner wall surface of the bolt hole 26c is set to a value obtained by the above equation (2).

Thereby, since the inner ring 14a can be fixed without a gap, the detection accuracy can be improved.
Further, in the present embodiment, the wall thickness to of the inner peripheral surface of the outer ring presser 28 and the inner wall surface of the bolt hole 28c is set to a value obtained by the above equation (3).
Thereby, since the outer ring 14b can be fixed without a gap, the detection accuracy can be improved.

Furthermore, in the present embodiment, the height H of the pressing portion 26b of the inner ring presser 26 is set to a value obtained by the above equation (4).
Thereby, since possibility that the gap of the resolver 30 will change can be reduced, possibility that the resolver 30 will detect incorrectly can be reduced.
In the second embodiment, the cross roller bearing 14 corresponds to the rolling bearing of the invention 6 to 10, the stator 22 corresponds to the inner ring supported body of the invention 7, 8 or 10, and the rotor 12 corresponds to the invention. 9 corresponds to the outer ring supported body, and the resolver 30 corresponds to the rotation sensor of the invention 7 or 10. The resolver rotor 18ra corresponds to the first resolver rotor of the invention 6, the resolver rotor 18ri corresponds to the second resolver rotor of the invention 6, and the bolts 18a and 18b correspond to the fixing means of the invention 6. .

In the first embodiment, the resolver 30, the cross roller bearing 14, and the motor unit 16 are arranged on the same radial plane in the order from the radially inner side. Arrangement order of cross roller bearing 14 and motor part 16 can be made arbitrary, for example, the following five composition can be adopted.
First, the first configuration will be described.

FIG. 6 is a cross-sectional view in the axial direction of a thin motor 100 in which the motor unit 16, the cross roller bearing 14 and the resolver 30 are arranged in the same order in the radial direction from the radial inner side.
As shown in FIG. 6, the motor unit 16, the cross roller bearing 14, and the resolver 30 are disposed on the same plane in the radial direction in that order from the radially inner side.
An annular inner wall body 22a protruding upward in the axial direction (upward direction in FIG. 6) is formed on the stator 22, and an annular outer wall body protruding upward in the axial direction is formed radially outward from the inner wall body 22a. 22b is formed. On the other hand, the rotor 12 is formed with an annular inner wall body 12a protruding downward in the axial direction (downward in FIG. 6), and the annular wall protruding downward in the axial direction is formed radially outward from the inner wall body 12a. An outer wall body 12b is formed. The stator 22 and the rotor 12 include an inner wall body 12a of the rotor 12 between the inner wall body 22a and the outer wall body 22b of the stator 22, and an outer wall body 22b of the stator 22 between the inner wall body 12a and the outer wall body 12b of the rotor 12. They are arranged so as to be positioned.

The inner ring 14 a is fixed to the inner wall body 12 a of the rotor 12 while being pressed in the axial direction. Specifically, the lower end of the inner wall body 12a of the rotor 12 is brought into contact with the upper surface of the inner ring 14a, the pressing portion 26b of the inner ring presser 26 is brought into contact with the lower surface of the inner ring 14a, and the inner ring presser 26 is connected to the inner wall of the rotor 12 with a bolt 26a. It is fixed by fastening to the body 12a.
The outer ring 14 b is fixed to the outer wall body 22 b of the stator 22 while being pressed in the axial direction. Specifically, the upper end of the outer wall body 22b of the stator 22 is brought into contact with the lower surface of the outer ring 14b, the pressing portion 28b of the outer ring presser 28 is brought into contact with the upper surface of the outer ring 14b, and the outer ring presser 28 is fixed to the outer wall of the stator 22 with bolts 28a. It is fixed by fastening to the body 22b.

The permanent magnet 16 a is attached to the inner peripheral surface of the inner ring retainer 26, and is fixed to the inner peripheral surface side of the inner wall body 12 a of the rotor 12 together with the inner ring retainer 26. On the other hand, the coil 16b is attached to the outer peripheral surface of the inner wall 22a of the stator 22 by a bolt 16c.
The resolver 30 is an ABS / INC integrated resolver that outputs a unipolar resolver signal and a multipolar resolver signal, and is configured integrally with the resolver 30 in the first and second embodiments. Except for the same function. The resolver rotor 18 is attached to the outer wall 12b of the rotor 12 by bolts 18a. On the other hand, the resolver stator 20 is attached to the outer peripheral surface of the outer ring retainer 28 by bolts 20 a, and is fixed to the outer peripheral surface side of the outer wall body 22 b of the stator 22 together with the outer ring retainer 28.

Thus, in the first configuration, the motor unit 16, the cross roller bearing 14, and the resolver 30 are arranged on the same plane in the radial direction in that order from the radial inner side.
Thereby, in addition to the effect of reducing the possibility of erroneous detection of the resolver 30 and the effect of extending the life of the cross roller bearing 14, the resolver 30 is disposed on the opposite side of the motor unit 16 with the cross roller bearing 14 interposed therebetween. Therefore, the resolver 30 is hardly affected by noise and heat from the motor unit 16, and high detection accuracy can be realized. In addition, since the resolver 30 is arranged on the outermost side in the radial direction, the diameter of the resolver 30 can be increased, so that the accuracy during mold processing can be stabilized and higher detection accuracy can be realized. .

Next, the second configuration will be described.
FIG. 7 is an axial cross-sectional view of a thin motor 100 in which the cross roller bearing 14, the motor unit 16, and the resolver 30 are arranged in the same order in the radial direction from the radially inner side.
As shown in FIG. 7, the cross roller bearing 14, the motor unit 16, and the resolver 30 are arranged on the same plane in the radial direction in that order from the radial inner side.

  An annular inner wall body 22a protruding upward in the axial direction (upward direction in FIG. 7) is formed on the stator 22, and an annular outer wall body protruding upward in the axial direction is formed radially outward from the inner wall body 22a. 22b is formed. On the other hand, the rotor 12 is formed with an annular inner wall 12a projecting downward in the axial direction (downward in FIG. 7), and the annular wall projecting downward in the axial direction is formed radially outward from the inner wall 12a. An outer wall body 12b is formed. The stator 22 and the rotor 12 include an inner wall body 12a of the rotor 12 between the inner wall body 22a and the outer wall body 22b of the stator 22, and an outer wall body 22b of the stator 22 between the inner wall body 12a and the outer wall body 12b of the rotor 12. They are arranged so as to be positioned.

The inner ring 14 a is fixed to the inner wall body 22 a of the stator 22 while being pressed in the axial direction. Specifically, the upper end of the inner wall body 22a of the stator 22 is brought into contact with the lower surface of the inner ring 14a, the pressing portion 26b of the inner ring presser 26 is brought into contact with the upper surface of the inner ring 14a, and the inner ring presser 26 is connected to the inner wall of the stator 22 with a bolt 26a. It is fixed by fastening to the body 22a.
The outer ring 14 b is fixed to the inner wall body 12 a of the rotor 12 while being pressed in the axial direction. Specifically, the lower end of the inner wall body 12a of the rotor 12 is brought into contact with the upper surface of the outer ring 14b, the pressing portion 28b of the outer ring presser 28 is brought into contact with the lower surface of the outer ring 14b, and the outer ring presser 28 is connected to the inner wall of the rotor 12 with bolts 28a. It is fixed by fastening to the body 12a.

The permanent magnet 16 a is attached to the outer peripheral surface of the outer ring retainer 28, and is fixed to the outer peripheral surface side of the inner wall body 12 a of the rotor 12 together with the outer ring retainer 28. On the other hand, the coil 16b is attached to the inner peripheral surface of the outer wall 22b of the stator 22 by a bolt 16c.
The resolver 30 is an ABS / INC integrated resolver that outputs a unipolar resolver signal and a multipolar resolver signal, and is configured integrally with the resolver 30 in the first and second embodiments. Except for the same function. The resolver rotor 18 is attached to the outer wall 12b of the rotor 12 by bolts 18a. On the other hand, the resolver stator 20 is attached to the outer peripheral surface of the outer wall body 22b of the stator 22 by a bolt 20a.

In this manner, in the second configuration, the cross roller bearing 14, the motor unit 16, and the resolver 30 are arranged on the same plane in the radial direction in that order from the radial inner side.
As a result, in addition to the effect of reducing the possibility of erroneous detection of the resolver 30 and the effect of extending the life of the cross roller bearing 14, the resolver 30 is disposed on the outermost side in the radial direction, thereby increasing the diameter of the resolver 30. Therefore, it is possible to stabilize the accuracy at the time of mold processing and realize higher detection accuracy. Further, since the cross roller bearing 14 is disposed on the innermost side in the radial direction, the height of the thin motor 100 can be reduced by reducing the size of the cross roller bearing 14, and the motor unit 16 or the resolver 30. The cross roller bearing 14 is less likely to leak grease.

Next, a third configuration will be described.
FIG. 8 is a cross-sectional view in the axial direction of a thin motor 100 in which the cross roller bearing 14, the resolver 30 and the motor unit 16 are arranged in the same order in the radial direction from the radially inner side.
As shown in FIG. 8, the cross roller bearing 14, the resolver 30, and the motor unit 16 are arranged on the same radial plane in that order from the radial inner side.

  The stator 22 is formed with an annular inner wall body 22a protruding upward in the axial direction (upward in FIG. 8), and an annular outer wall body protruding upward in the axial direction on the radially outer side of the inner wall body 22a. 22b is formed. On the other hand, the rotor 12 is formed with an annular inner wall 12a projecting downward in the axial direction (downward in FIG. 8), and the annular wall projecting downward in the axial direction is formed radially outward from the inner wall 12a. An outer wall body 12b is formed. The stator 22 and the rotor 12 include an inner wall body 12a of the rotor 12 between the inner wall body 22a and the outer wall body 22b of the stator 22, and an outer wall body 22b of the stator 22 between the inner wall body 12a and the outer wall body 12b of the rotor 12. They are arranged so as to be positioned.

The inner ring 14 a is fixed to the inner wall body 22 a of the stator 22 while being pressed in the axial direction. Specifically, the upper end of the inner wall body 22a of the stator 22 is brought into contact with the lower surface of the inner ring 14a, the pressing portion 26b of the inner ring presser 26 is brought into contact with the upper surface of the inner ring 14a, and the inner ring presser 26 is connected to the inner wall of the stator 22 with a bolt 26a. It is fixed by fastening to the body 22a.
The outer ring 14 b is fixed to the inner wall body 12 a of the rotor 12 while being pressed in the axial direction. Specifically, the lower end of the inner wall body 12a of the rotor 12 is brought into contact with the upper surface of the outer ring 14b, the pressing portion 28b of the outer ring presser 28 is brought into contact with the lower surface of the outer ring 14b, and the outer ring presser 28 is connected to the inner wall of the rotor 12 with a bolt 28a. It is fixed by fastening to the body 12a.

The permanent magnet 16 a is attached to the inner peripheral surface of the outer wall body 12 b of the rotor 12. On the other hand, the coil 16b is attached to the outer peripheral surface of the outer wall body 22b of the stator 22 by a bolt 16c.
The resolver 30 is an ABS / INC integrated resolver that outputs a unipolar resolver signal and a multipolar resolver signal, and is configured integrally with the resolver 30 in the first and second embodiments. Except for the same function. The resolver rotor 18 is attached to the outer peripheral surface of the outer ring retainer 28 by bolts 18 a, and is fixed to the outer peripheral surface side of the inner wall body 12 a of the rotor 12 together with the outer ring retainer 28. On the other hand, the resolver stator 20 is attached to the inner peripheral surface of the outer wall body 22b of the stator 22 by a bolt 20a.

Thus, in the third configuration, the cross roller bearing 14, the resolver 30, and the motor unit 16 are arranged on the same radial plane in the order from the radial inner side.
Thereby, in addition to the effect of reducing the possibility of erroneous detection of the resolver 30 and the effect of extending the life of the cross roller bearing 14, the cross roller bearing 14 is disposed at the innermost side in the radial direction. By reducing the size of 14, the height of the thin motor 100 can be reduced, wiring to the motor unit 16 or the resolver 30 is easy, and grease of the cross roller bearing 14 is difficult to leak. Moreover, since the motor part 16 is arrange | positioned on the outermost side of radial direction, the space which winds a coil | winding can be ensured large and a high output torque can be implement | achieved. Furthermore, the number of poles of the motor unit 16 can be increased, and operation from low speed to ultra-low speed can be realized.

Next, a fourth configuration will be described.
FIG. 9 is a cross-sectional view in the axial direction of a thin motor 100 in which the motor unit 16, the resolver 30 and the cross roller bearing 14 are arranged in the same order in the radial direction from the radially inner side.
As shown in FIG. 9, the motor unit 16, the resolver 30 and the cross roller bearing 14 are arranged on the same plane in the radial direction in that order from the radial inner side.

  The stator 22 is formed with an annular inner wall body 22a protruding upward in the axial direction (upward in FIG. 9), and an annular outer wall body protruding upward in the axial direction on the radially outer side of the inner wall body 22a. 22b is formed. On the other hand, the rotor 12 is formed with an annular inner wall 12a that protrudes downward in the axial direction (downward in FIG. 9), and an annular inner wall 12a that protrudes downward in the axial direction is formed radially outward from the inner wall 12a. An outer wall body 12b is formed. The stator 22 and the rotor 12 include an inner wall body 12a of the rotor 12 between the inner wall body 22a and the outer wall body 22b of the stator 22, and an outer wall body 22b of the stator 22 between the inner wall body 12a and the outer wall body 12b of the rotor 12. They are arranged so as to be positioned.

The inner ring 14 a is fixed to the outer wall body 22 b of the stator 22 while being pressed in the axial direction. Specifically, the upper end of the outer wall body 22b of the stator 22 is brought into contact with the lower surface of the inner ring 14a, the pressing portion 26b of the inner ring retainer 26 is brought into contact with the upper surface of the inner ring 14a, and the inner ring retainer 26 is secured to the outer wall of the stator 22 with bolts 26a. It is fixed by fastening to the body 22b.
The outer ring 14b is fixed to the outer wall body 12b of the rotor 12 while being pressed in the axial direction. Specifically, the lower end of the outer wall body 12b of the rotor 12 is brought into contact with the upper surface of the outer ring 14b, the pressing portion 28b of the outer ring presser 28 is brought into contact with the lower surface of the outer ring 14b, and the outer ring presser 28 is connected to the outer wall of the rotor 12 with bolts 28a. It is fixed by fastening to the body 12b.

The permanent magnet 16 a is attached to the inner peripheral surface of the inner wall body 12 a of the rotor 12. On the other hand, the coil 16b is attached to the outer peripheral surface of the inner wall 22a of the stator 22 by a bolt 16c.
The resolver 30 is an ABS / INC integrated resolver that outputs a unipolar resolver signal and a multipolar resolver signal, and is configured integrally with the resolver 30 in the first and second embodiments. Except for the same function. The resolver rotor 18 is attached to the outer peripheral surface of the inner wall body 12a of the rotor 12 by bolts 18a. On the other hand, the resolver stator 20 is attached to the inner peripheral surface of the inner ring retainer 26 by bolts 20 a and is fixed to the inner peripheral surface side of the outer wall body 22 b of the stator 22 together with the inner ring retainer 26.

Thus, in the fourth configuration, the motor unit 16, the resolver 30, and the cross roller bearing 14 are arranged on the same plane in the radial direction in that order from the radial inner side.
As a result, in addition to the effect of reducing the possibility of erroneous detection of the resolver 30 and the effect of extending the life of the cross roller bearing 14, the cross roller bearing 14 is disposed on the outermost side in the radial direction. The cross roller bearing 14 can be accommodated, and high rigidity can be realized.

Next, a fifth configuration will be described.
FIG. 10 is a sectional view in the axial direction of a thin motor 100 in which the resolver 30, the motor unit 16, and the cross roller bearing 14 are arranged on the same plane in the radial direction in that order from the radially inner side.
As shown in FIG. 10, the resolver 30, the motor unit 16, and the cross roller bearing 14 are arranged on the same plane in the radial direction in that order from the radial inner side.

  An annular inner wall body 22a protruding upward in the axial direction (upward direction in FIG. 10) is formed on the stator 22, and an annular outer wall body protruding upward in the axial direction is formed radially outward from the inner wall body 22a. 22b is formed. On the other hand, the rotor 12 is formed with an annular inner wall 12a protruding downward in the axial direction (downward in FIG. 10), and an annular inner wall 12a protruding downward in the axial direction is formed radially outward from the inner wall 12a. An outer wall body 12b is formed. The stator 22 and the rotor 12 include an inner wall body 12a of the rotor 12 between the inner wall body 22a and the outer wall body 22b of the stator 22, and an outer wall body 22b of the stator 22 between the inner wall body 12a and the outer wall body 12b of the rotor 12. They are arranged so as to be positioned.

The inner ring 14 a is fixed to the outer wall body 22 b of the stator 22 while being pressed in the axial direction. Specifically, the upper end of the outer wall body 22b of the stator 22 is brought into contact with the lower surface of the inner ring 14a, the pressing portion 26b of the inner ring retainer 26 is brought into contact with the upper surface of the inner ring 14a, and the inner ring retainer 26 is secured to the outer wall of the stator 22 with bolts 26a. It is fixed by fastening to the body 22b.
The outer ring 14b is fixed to the outer wall body 12b of the rotor 12 while being pressed in the axial direction. Specifically, the lower end of the outer wall body 12b of the rotor 12 is brought into contact with the upper surface of the outer ring 14b, the pressing portion 28b of the outer ring presser 28 is brought into contact with the lower surface of the outer ring 14b, and the outer ring presser 28 is connected to the outer wall of the rotor 12 with bolts 28a. It is fixed by fastening to the body 12b.

The permanent magnet 16 a is attached to the outer peripheral surface of the inner wall body 12 a of the rotor 12. On the other hand, the coil 16 b is attached to the inner peripheral surface of the inner ring retainer 26 by a bolt 16 c and is fixed to the inner peripheral surface side of the outer wall body 22 b of the stator 22 together with the inner ring retainer 26.
The resolver 30 is an ABS / INC integrated resolver that outputs a unipolar resolver signal and a multipolar resolver signal, and is configured integrally with the resolver 30 in the first and second embodiments. Except for the same function. The resolver rotor 18 is attached to the inner peripheral surface of the inner wall 12a of the rotor 12 by bolts 18a. On the other hand, the resolver stator 20 is attached to the outer peripheral surface of the inner wall 22a of the stator 22 by a bolt 20a.

In this way, in the fifth configuration, the resolver 30, the motor unit 16, and the cross roller bearing 14 are arranged on the same radial plane in this order from the radial inner side.
As a result, in addition to the effect of reducing the possibility of erroneous detection of the resolver 30 and the effect of extending the life of the cross roller bearing 14, the cross roller bearing 14 is disposed on the outermost side in the radial direction. The cross roller bearing 14 can be accommodated, and high rigidity can be realized.

5 to 9, the ABS / INC integrated resolver is provided. However, the present invention is not limited to this, and the ABS / INC integrated resolver can be used alone, or it can be configured using only the ABS resolver. It can also be configured from ABS type and INC type resolvers.
In the second embodiment, the resolver 30, the cross roller bearing 14, and the motor unit 16 are arranged on the same plane in the radial direction in that order from the radially inner side. Arrangement order of cross roller bearing 14 and motor part 16 can be made arbitrary, for example, the following five composition can be adopted.

First, the first configuration will be described.
FIG. 11 is a sectional view in the axial direction of the thin motor 100 when the configuration of FIG. 5 is applied to the second embodiment.
As shown in FIG. 11, the resolver 30 is not an ABS / INC integrated resolver, but is configured as an ABS type or INC type resolver in the second embodiment.

The resolver rotors 18 ra and 18 ri are arranged with a minute interval via a rotor spacer 42. The resolver rotor 18ra is fixed and attached between the inner peripheral surface of the outer wall 12b of the rotor 12 and the upper surface of the rotor spacer 42 by bolts 18a. The resolver rotor 18ri is attached to the lower surface of the rotor spacer 42 by bolts 18b.
The resolver stators 20sa and 20si are arranged with a minute interval via a stator spacer 44. The resolver stator 20sa is fixed and attached between the outer peripheral surface of the outer ring retainer 28 and the upper surface of the stator spacer 44 by a bolt 20a. The resolver stator 20si is attached to the lower surface of the stator spacer 44 by bolts 20b. Therefore, the resolver stators 20 sa and 20 si are fixed to the outer peripheral surface side of the outer wall body 22 b of the stator 22 together with the outer ring presser 28.

The height D of the wiring pipe 48 is set to a value obtained by the above equation (1).
The wall thickness t i of the outer peripheral surface of the inner ring retainer 26 and the inner wall surface of the bolt hole 26c is within the range of the above equation (2), and the wall thickness to of the inner peripheral surface of the outer ring retainer 28 and the inner wall surface of the bolt hole 28c is The values are set in the range of the above formula (3).
The height H of the pressing portion 28b of the outer ring presser 28 is set to a value obtained by the above equation (4).

Next, the second configuration will be described.
FIG. 12 is a sectional view in the axial direction of the thin motor 100 when the configuration of FIG. 6 is applied to the second embodiment.
As shown in FIG. 12, the resolver 30 is not an ABS / INC integrated resolver, but is configured as an ABS type or INC type resolver in the second embodiment.

The resolver rotors 18 ra and 18 ri are arranged with a minute interval via a rotor spacer 42. The resolver rotor 18ra is fixed and attached between the inner peripheral surface of the outer wall 12b of the rotor 12 and the upper surface of the rotor spacer 42 by bolts 18a. The resolver rotor 18ri is attached to the lower surface of the rotor spacer 42 by bolts 18b.
The resolver stators 20sa and 20si are arranged with a minute interval via a stator spacer 44. The resolver stator 20si is fixed and attached between the outer peripheral surface of the outer wall body 22b of the stator 22 and the lower surface of the stator spacer 44 by a bolt 20a. The resolver stator 20sa is attached to the upper surface of the stator spacer 44 by bolts 20b.

The height D of the wiring pipe 48 is set to a value obtained by the above equation (1).
The wall thickness t i of the outer peripheral surface of the inner ring retainer 26 and the inner wall surface of the bolt hole 26c is within the range of the above equation (2), and the wall thickness t o of the inner peripheral surface of the outer ring retainer 28 and the inner wall surface of the bolt hole 28c is The values are set in the range of the above formula (3).
Next, a third configuration will be described.

FIG. 13 is a sectional view in the axial direction of the thin motor 100 when the configuration of FIG. 7 is applied to the second embodiment.
As shown in FIG. 13, the resolver 30 is not an ABS / INC integrated resolver, but is configured as an ABS type and INC type resolver in the second embodiment.
The resolver rotors 18 ra and 18 ri are arranged with a minute interval via a rotor spacer 42. The resolver rotor 18ra is fixed and attached between the outer peripheral surface of the outer ring retainer 28 and the upper surface of the rotor spacer 42 by bolts 18a. The resolver rotor 18ri is attached to the lower surface of the rotor spacer 42 by bolts 18b.

  The resolver stators 20sa and 20si are arranged with a minute interval via a stator spacer 44. The resolver stator 20si is fixed and attached between the inner peripheral surface of the outer wall body 22b of the stator 22 and the lower surface of the stator spacer 44 by a bolt 20a. The resolver stator 20sa is attached to the upper surface of the stator spacer 44 by bolts 20b.

The height D of the wiring pipe 48 is set to a value obtained by the above equation (1).
The wall thickness t i of the outer peripheral surface of the inner ring retainer 26 and the inner wall surface of the bolt hole 26c is within the range of the above equation (2), and the wall thickness to of the inner peripheral surface of the outer ring retainer 28 and the inner wall surface of the bolt hole 28c is The values are set in the range of the above formula (3).
The height H of the pressing portion 28b of the outer ring presser 28 is set to a value obtained by the above equation (4).

Next, a fourth configuration will be described.
FIG. 14 is a cross-sectional view in the axial direction of the thin motor 100 when the configuration of FIG. 8 is applied to the second embodiment.
As shown in FIG. 14, the resolver 30 is not an ABS / INC integrated resolver, but is configured as an ABS type or INC type resolver in the second embodiment.

The resolver rotors 18 ra and 18 ri are arranged with a minute interval via a rotor spacer 42. The resolver rotor 18ra is fixed and attached between the outer peripheral surface of the inner wall 12a of the rotor 12 and the upper surface of the rotor spacer 42 by bolts 18a. The resolver rotor 18ri is attached to the lower surface of the rotor spacer 42 by bolts 18b.
The resolver stators 20sa and 20si are arranged with a minute interval via a stator spacer 44. The resolver stator 20sa is fixed and attached between the inner peripheral surface of the inner ring retainer 26 and the upper surface of the stator spacer 44 by a bolt 20a. The resolver stator 20si is attached to the lower surface of the stator spacer 44 by bolts 20b. Therefore, the resolver stators 20 sa and 20 si are fixed to the inner peripheral surface side of the outer wall body 22 b of the stator 22 together with the inner ring presser 26.

The height D of the wiring pipe 48 is set to a value obtained by the above equation (1).
The wall thickness t i of the outer peripheral surface of the inner ring retainer 26 and the inner wall surface of the bolt hole 26c is within the range of the above equation (2), and the wall thickness to of the inner peripheral surface of the outer ring retainer 28 and the inner wall surface of the bolt hole 28c is The values are set in the range of the above formula (3).
The height H of the pressing portion 26b of the inner ring presser 26 is set to a value obtained by the above equation (4).

Next, a fifth configuration will be described.
FIG. 15 is a sectional view in the axial direction of the thin motor 100 when the configuration of FIG. 9 is applied to the second embodiment.
As shown in FIG. 15, the resolver 30 is not an ABS / INC integrated resolver, but is configured as an ABS type and INC type resolver in the second embodiment.

The resolver rotors 18 ra and 18 ri are arranged with a minute interval via a rotor spacer 42. The resolver rotor 18ra is fixed and attached between the inner peripheral surface of the inner wall 12a of the rotor 12 and the upper surface of the rotor spacer 42 by bolts 18a. The resolver rotor 18ri is attached to the lower surface of the rotor spacer 42 by bolts 18b.
The resolver stators 20sa and 20si are arranged with a minute interval via a stator spacer 44. The resolver stator 20si is fixed and attached between the outer peripheral surface of the inner wall body 22a of the stator 22 and the lower surface of the stator spacer 44 by a bolt 20a. The resolver stator 20sa is attached to the upper surface of the stator spacer 44 by bolts 20b.

The height D of the wiring pipe 48 is set to a value obtained by the above equation (1).
The wall thickness t i of the outer peripheral surface of the inner ring retainer 26 and the inner wall surface of the bolt hole 26c is within the range of the above equation (2), and the wall thickness t o of the inner peripheral surface of the outer ring retainer 28 and the inner wall surface of the bolt hole 28c is The values are set in the range of the above formula (3).
11 to 15, the ABS type and the INC type resolver are provided. However, the invention is not limited to this, and the ABS type and the INC type resolver can be used alone, or only the INC type resolver can be used. It can also be configured from an ABS / INC integrated resolver.

Moreover, in the said 1st and 2nd embodiment, although comprised with the inner rotor type | mold which the inner side of the thin motor 100 rotates, it comprises not only this but the outer rotor type | mold which the outer side of the thin motor 100 rotates. You can also. In this case, the rotor 12 becomes an inner ring supported body, and the stator 22 becomes an outer ring supported body.
Further, in the configuration of FIGS. 6 to 15, the outer rotor type in which the outer side of the thin motor 100 is rotated is configured. However, the configuration is not limited thereto, and the inner rotor type in which the inner side of the thin motor 100 is rotated can also be configured. . In this case, the rotor 12 becomes an inner ring supported body, and the stator 22 becomes an outer ring supported body.

  In the first embodiment, the resolver rotor 18 is attached to the outer peripheral surface of the inner wall body 12a of the rotor 12 and the resolver stator 20 is attached to the inner peripheral surface of the inner ring retainer 26. The resolver stator 20 may be attached to the outer peripheral surface of the inner wall body 12 a of the rotor 12, and the resolver rotor 18 may be attached to the inner peripheral surface of the inner ring presser 26. The same applies to the configurations of FIGS.

  Further, in the first and second embodiments, the inner wall body 22a and the outer wall body 22b of the stator 22 are formed as a part of the stator 22. However, the present invention is not limited to this, and the inner wall body 22a or the outer wall body of the stator 22 is formed. It is also possible to configure 22b as a separate member and attach it to the stator 22. Further, the inner ring retainer 26 can be directly attached to the stator 22 without forming the inner wall body 22a of the stator 22, but in this case, the inner ring retainer 26 constitutes the inner wall body of the stator 22. The same applies to the configurations of FIGS.

  In the first and second embodiments, the inner wall body 12a and the outer wall body 12b of the rotor 12 are formed as a part of the rotor 12. However, the present invention is not limited thereto, and the inner wall body 12a or the outer wall body of the rotor 12 is not limited thereto. It is also possible to configure 12b as a separate member and attach it to the rotor 12. Further, the outer ring retainer 28 can be directly attached to the rotor 12 without forming the outer wall body 12b of the rotor 12, but in this case, the outer ring retainer 28 constitutes the outer wall body of the rotor 12. The same applies to the configurations of FIGS.

In the first and second embodiments, the resolver 30, the cross roller bearing 14, and the motor unit 16 are arranged on the same plane in the radial direction. However, the present invention is not limited to this, and the motor unit 16 includes the resolver 30. The cross roller bearing 14 and the cross roller bearing 14 may not be arranged on the same plane. The same applies to the configurations of FIGS.
Moreover, in the said 1st and 2nd embodiment, although the cross roller bearing 14 was applied, it is not limited to this, A four-point contact ball bearing, an angular ball bearing, a deep groove ball bearing, a cylindrical roller bearing, A tapered roller bearing or the like may be applied. In this case, it is preferable to employ a rolling bearing that can simultaneously receive a moment load, an axial load, and a radial load. An example of such a rolling bearing is a four-point contact ball bearing. The same applies to the configurations of FIGS.

  In the first and second embodiments, the rolling bearing device having the radial planar arrangement structure of the composite resolver according to the present invention is applied to a structure that rotatably supports the stator 22 and the rotor 12. The present invention is not limited to this, and any structure can be applied as long as it is interposed between two members and supports them relatively rotatably. The same applies to the configurations of FIGS.

It is sectional drawing of the axial direction of the thin motor 100 which concerns on this Embodiment. 2 is a block diagram showing a configuration of a control system for a thin motor 100. FIG. It is sectional drawing of the axial direction of the thin motor 100 which concerns on this Embodiment. 3 is a bottom view of a rotor spacer 42. FIG. FIG. 5 is a cross-sectional view in the axial direction along the line A-O-A ′ of FIG. 4. It is sectional drawing of the axial direction of the thin motor 100 which has arrange | positioned the motor part 16, the cross roller bearing 14, and the resolver 30 on the same plane of radial direction in the order from radial inside. FIG. 2 is an axial sectional view of a thin motor 100 in which a cross roller bearing 14, a motor unit 16, and a resolver 30 are arranged on the same plane in the radial direction in that order from the radial inner side. FIG. 2 is an axial sectional view of a thin motor 100 in which a cross roller bearing 14, a resolver 30 and a motor unit 16 are arranged in the same order in the radial direction from the radial inner side. FIG. 2 is an axial sectional view of a thin motor 100 in which a motor unit 16, a resolver 30 and a cross roller bearing 14 are arranged in the same order in the radial direction from the radially inner side. It is sectional drawing of the axial direction of the thin motor 100 which has arrange | positioned the resolver 30, the motor part 16, and the cross roller bearing 14 on the same plane of radial direction in the order from radial inside. It is sectional drawing of the axial direction of the thin motor 100 at the time of applying the structure of FIG. 5 to the said 2nd Embodiment. It is sectional drawing of the axial direction of the thin motor 100 at the time of applying the structure of FIG. 6 to the said 2nd Embodiment. It is sectional drawing of the axial direction of the thin motor 100 at the time of applying the structure of FIG. 7 to the said 2nd Embodiment. It is sectional drawing of the axial direction of the thin motor 100 at the time of applying the structure of FIG. 8 to the said 2nd Embodiment. It is sectional drawing of the axial direction of the thin motor 100 at the time of applying the structure of FIG. 9 to the said 2nd Embodiment. It is sectional drawing of the axial direction of the conventional thin motor 200. FIG.

Explanation of symbols

100, 200 Thin motor 12 Rotor 14 Cross roller bearing 14a Inner ring 14b Outer ring 14c Cross roller 16 Motor unit 16a Permanent magnet 16b Coil 30 Resolver 18 Resolver rotor 20 Resolver stator 42 Rotor spacer 44 Stator spacer 22 Stator 12a, 22a Inner wall 12b , 22b Outer wall body 26 Inner ring presser 28 Outer ring presser 26b, 28b Press part 16c, 18a, 20a, 24a, 26a, 28a Bolt 24 Fixing plate 70 Drive unit 60 Servo driver 61 Oscillator 63 Changeover switch 220 Inner inner 18ra, 18ri Resolver rotor 20sa, 20si resolver stator 18b, 20b bolt 26c, 28c, 46a, 46b bolt hole 42 rotor spacer 44 stator spacer 48 wiring tube

Claims (10)

A rolling bearing having an inner ring and an outer ring, an inner ring supported body supported by the inner ring, an outer ring supported body supported by the outer ring, and the inner ring supported body and the outer ring supported body; In a rolling bearing device comprising a rotation sensor that outputs a sensor signal that changes according to their relative position,
The rotation sensor and the rolling bearing are arranged on the same plane in the radial direction,
The rotation sensor includes a first resolver that outputs the sensor signal in which a fundamental wave component of a reluctance change that changes in synchronization with the rotation of the inner ring supported body or the outer ring supported body is a first period, and the reluctance change. Comprising a second resolver that outputs the sensor signal having a second period different from the first period.
Further, the oscillator outputs the excitation signal, and the first resolver and the first resolver are supplied from the oscillator so that the excitation signal is supplied to a resolver that is alternatively selected from the first resolver and the second resolver. 2. A rolling bearing device having a radial planar arrangement structure of a composite resolver, comprising switching means for switching a supply path of excitation signals supplied to the two resolvers. A rolling bearing having an inner ring and an outer ring, an inner ring supported body supported by the inner ring, an outer ring supported body supported by the outer ring, and the inner ring supported body and the outer ring supported body relatively rotate. In a rolling bearing device comprising: a driving body; and a rotation sensor that is arranged between the inner ring supported body and the outer ring supported body and outputs a sensor signal that varies depending on a relative position thereof.
The rotation sensor, the rolling bearing and the driving body are arranged on the same plane in the radial direction in the order from the radial inner side,
The rotation sensor includes a first resolver that outputs the sensor signal in which a fundamental wave component of a reluctance change that changes in synchronization with the rotation of the inner ring supported body or the outer ring supported body is a first period, and the reluctance change. Comprising a second resolver that outputs the sensor signal having a second period different from the first period.
Further, the oscillator outputs the excitation signal, and the first resolver and the first resolver are supplied from the oscillator so that the excitation signal is supplied to a resolver that is alternatively selected from the first resolver and the second resolver. 2. A rolling bearing device having a radial planar arrangement structure of a composite resolver, comprising switching means for switching a supply path of excitation signals supplied to the two resolvers. In claim 2,
The inner ring supported body and the outer ring supported body respectively have an inner wall body and an outer wall body formed inside and outside in the radial direction, and the inner wall body of the inner ring supported body is an inner wall body and an outer wall body of the outer ring supported body. Between, the outer wall body of the outer ring supported body is disposed straddling each other so as to be located between the inner wall body and the outer wall body of the inner ring supported body,
The detected body of the rotation sensor is fixed to one of the inner wall body of the outer ring supported body and the inner wall body of the inner ring supported body, and the detection means of the rotation sensor is fixed to the other,
Fixing the inner ring to the inner wall of the inner ring supported body, and fixing the outer ring to the outer wall of the outer ring supported body;
A radial plane of a composite resolver, wherein a rotor of the driving body is fixed to one of an outer wall body of the outer ring supported body and an outer wall body of the inner ring supported body, and a stator of the driving body is fixed to the other. A rolling bearing device having an arrangement structure. In any one of Claims 1 thru | or 3,
The rolling bearing device having a radial planar arrangement structure of a composite resolver, wherein the rolling bearing is a cross roller bearing or a four-point contact ball bearing. In any one of Claims 1 thru | or 4,
The first resolver includes a first resolver stator and a first resolver rotor, and a reluctance between the first resolver rotor and the second resolver stator varies depending on a position of the first resolver rotor, and the first resolver rotor A single pole resolver that outputs the sensor signal in which the fundamental wave component of the reluctance change is one period per rotation of the rotor;
The second resolver has a second resolver stator and a second resolver rotor, and a reluctance between the second resolver rotor and the second resolver stator varies depending on a position of the second resolver rotor, and the second resolver A rolling bearing device having a radial planar arrangement structure of a composite resolver, characterized in that it is a multipolar resolver that outputs the sensor signal in which the fundamental wave component of the reluctance change has multiple cycles per rotation of the rotor. In any one of Claims 1 thru | or 4,
The first resolver has a first resolver rotor, and the second resolver has a second resolver rotor,
The first resolver rotor and the second resolver rotor are arranged at a minute interval via a rotor spacer and are attached by two fixing means, respectively, in a radial plane arrangement of the composite resolver A rolling bearing device having a structure. In any one of Claims 1 thru | or 6,
In the inner ring supported body, a wiring pipe that penetrates from the radially inner side of the inner ring supported body to the radially outer side and accommodates the wiring of the rotation sensor is formed,
The height D of the wiring pipe is defined as follows. The diameter of one wiring of the rotation sensor is d, and the predetermined margin is α (0 <α <d).
D = 2d + α
A rolling bearing device having a radial planar arrangement structure of a composite resolver, characterized in that it is set to a value obtained by the above. In any one of Claims 1 thru | or 7,
And an inner ring presser for fixing the inner ring to the inner ring supported body in the axial direction,
In the inner ring presser, a bolt hole for inserting a bolt for fixing the inner ring presser is formed in the axial direction,
The wall thickness ti of the outer peripheral surface of the inner ring presser and the inner wall surface of the bolt hole is defined as follows.
pi <ti <2pi
A rolling bearing device having a radial planar arrangement structure of a composite resolver, characterized in that it is set to a value in the range of. In any one of Claims 1 thru | or 8,
And an outer ring presser for fixing the outer ring to the outer ring supported body in the axial direction,
In the outer ring presser, a bolt hole for inserting a bolt for fixing the outer ring presser is formed in the axial direction,
The wall thickness to of the inner peripheral surface of the outer ring presser and the inner wall surface of the bolt hole is defined as po for the length of one pitch of the bolt hole.
po <to <2 po
A rolling bearing device having a radial planar arrangement structure of a composite resolver, characterized in that it is set to a value in the range of. In any one of claims 1 to 7 and 9,
Furthermore, an inner ring presser that fixes the inner ring to the inner ring supported body in the axial direction is provided, and the rotation sensor, the inner ring presser, and the rolling bearing are arranged on the same plane in the radial direction in that order from the radially inner side,
The height H of the pressing portion of the inner ring presser is as follows, where B is the height of the rolling bearing.
H = 1 / 2B
A rolling bearing device having a radial planar arrangement structure of a composite resolver, characterized in that it is set to a value obtained by the above.

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