JP2010181269A - Magnetic resolver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic resolver that facilitates the management of air gaps and practically sufficiently improving reliability in the accuracy of detecting rotational angles. <P>SOLUTION: The magnetic resolver 1 includes: a circular-ring-like rotor 3 rotatably arranged integrally with a rotating shaft 4; a pair of stators 21 and 22 which are arranged in such a way as to be opposed to the rotor 3 and to be on both sides of the rotor from lower and upper directions in the axial diction of the rotating shaft 4 and in which protrusion-shaped salient poles 21a, 21b, 22a, and 22b circumferentially protrude toward the rotor 3 at regular intervals; and coils 24, 25, 26, 27 wound on the salient poles 21a, 21b, 22a, and 22b. The magnetic resolver 1 detects the rotational angle of the rotor 3 through the use of the inductance of the coils 24, 25, 26, 27 changing according to the rotational angle of the rotor 3. The magnetic resolver 1 has a connection 23 for connecting the pair of stators 21 and 22, and the connection 23 holds the pair of the stators 21 and 22 in such a way as to be separated from each other at prescribed intervals. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a magnetic resolver, and is particularly suitable for application to a variable reluctance resolver that utilizes the fact that the efficiency of a transformer changes due to a change in a gap provided in a magnetic path between a rotor and a stator. Is.

  Conventionally, high-power brushless motors are used in electric power steering (EPS) of automobiles, hybrid cars, and electric cars. In order to control such a brushless motor, it is necessary to accurately grasp the rotation angle of the output shaft of the motor. This is because it is necessary to accurately grasp the rotational position of the rotor in order to control energization switching to each coil of the stator. In particular, in an automobile, since cogging deteriorates drivability, it is desired to reduce cogging. Therefore, it is desirable to perform energization switching accurately.

  Usually, in order to detect the rotation angle of the output shaft in an automobile motor, a resolver is often used in order to satisfy functions such as high temperature resistance, noise resistance, vibration resistance, and high humidity resistance. . The resolver is incorporated in the motor and is directly attached to the output shaft of the motor.

  Here, the resolver generally has a stator and a rotor, and the stator side has a stator core (stator) around which an exciting coil is wound. On the other hand, the rotor side is provided with a rotor core (rotor) formed of a magnetic material, and the rotor core is fixed to the output shaft of the motor. In such a resolver, when a high frequency signal is applied to the stator side excitation coil, the phase of the signal flowing through the stator side detection coil changes depending on the rotational position of the rotor. The rotation position (angle) of the rotor is detected by comparing the detection signal with the reference signal.

  By the way, as this type of resolver, a variable reluctance (VR) type resolver (hereinafter referred to as a VR type resolver) has been used in recent years. This VR resolver is a resolver that utilizes the fact that the efficiency of the transformer changes due to the fluctuation of the gap provided in the magnetic path. By setting the shape of the rotor so that the gap periodically changes with respect to the rotation angle, there is an advantage that the angle output can be detected without winding on the rotor side.

  The VR resolver includes a stator in which an excitation coil and a detection coil are disposed, and a rotor in which an outer peripheral surface is disposed in proximity to both coils. The detection coil is composed of two coils whose phases are shifted by 90 degrees, and applies several [KHz] sinusoidal alternating current to the excitation coil. And an induced voltage is output from two coils of a detection coil via the outer peripheral surface of a rotor. Then, the angle can be detected from the output amplitudes of the two induced voltages.

  At this time, if the frequency of the sine wave applied to the exciting coil is increased, the number of windings can be reduced and the resolver can be reduced in size, but if the frequency is increased, the electric circuit for reading the rotation angle becomes complicated, There is a concern that the stability of detection accuracy is reduced.

  As such a VR resolver, for example, a magnetic resolver of a type having a rotatable rotor core and two stator cores sandwiching the rotor core from above and below with respect to the rotation axis of the rotor core is also known. In this magnetic resolver, the stator core is provided with a stator plate, and the stator plate is arranged with convex salient poles along the circumferential direction, and a film coil is wound around each salient pole, The rotation angle of the rotor core is detected by utilizing the fact that the inductance of the coil changes according to the rotation angle of the rotor core (for example, see Patent Document 1).

Japanese Utility Model Publication No. 5-3921

  By the way, in this type of VR resolver, the variation range of the magnetic flux resistance accompanying the rotor rotation is large, and the variation pattern of the magnetic flux resistance accompanying the rotor rotation is smooth and stable. It is an important factor in raising the level. The manner in which the magnetic flux resistance changes with the rotation of the rotor mainly depends on the configuration of the rotor and the configuration of salient poles (including relative relationships) on the stator.

  In this regard, although Patent Document 1 described above discloses a specific configuration related to the outer contour shape of the rotor core, the salient pole shape, the relationship between the salient pole shape and the outer contour shape of the rotor core. In addition, the specific configuration of the positional relationship between the salient poles and the outer peripheral edge of the rotor core is not disclosed, and there is still a problem that is insufficient to efficiently improve the detection accuracy of the rotation angle.

  In particular, in a conventional resolver having a configuration in which a winding is wound around a core that is radially opposed from the stator to the rotor, a gap between the rotor and the salient pole, a so-called air gap, remains as a magnetic resistance. Therefore, air gap management is indispensable for stable output. However, because of the structure, the stator is disposed on a non-operating body such as a motor housing, and the rotor is disposed on an operating measurement target such as a rotating shaft. Is difficult to manage. As a countermeasure, it may be possible to use a special mechanism such as addition of a thrust bearing or precision assembly, but the cost is unavoidable.

  Moreover, in the resolver using the film-form coil formed in the pattern form on the board | substrate like the above-mentioned patent document 1, it is the structure of winding a winding as a coil to the convex core which faces a rotor from a stator to radial direction. Compared to a conventional resolver, the resolver body can be made thinner (smaller), and the coil winding operation becomes unnecessary.

  However, on the other hand, the use of a film-like coil causes a problem that it is expensive, and the reduction in thickness (miniaturization) reduces the space for winding the coil and the number of turns of the coil decreases. There is a problem that causes a decrease in output. For this reason, in order to secure the number of windings of the coil, a method of reducing the diameter of the winding wire can be considered, but there is no doubt that the reliability of the rotational angle detection accuracy is reduced.

  Moreover, the above-described Patent Document 1 does not disclose a specific configuration of the substrate on which the film-like coil is formed. For example, in the configuration in which the substrate of the film-like coil is provided separately for each salient pole There is a problem that is bad.

  Further, in the configuration using the film-like coil, it is difficult to efficiently increase the number of turns of the coil as compared with the conventional resolver in which the winding is wound around the core that is radially opposed to the rotor from the stator. It is.

  Furthermore, in the resolver as in Patent Document 1 described above, since the stator has an annular structure, it is necessary to insert a rotating shaft in which the rotor is disposed at the center of the stator. Therefore, as compared with a resolver having a structure in which the stator is attached to the rotor from the radial direction, the number of assembling steps at the time of assembling or maintenance such as failure increases, and the work becomes complicated. For this reason, there was still an insufficient problem which lowered work efficiency (assembly nature).

  Therefore, the present invention has been made in view of such problems, and can easily manage the air gap and can improve the reliability in the detection accuracy of the rotation angle in practical use. The main purpose is to provide a resolver.

  In addition, a subordinate object of the present invention is to be able to significantly improve the work efficiency (assembleability) at the time of assembly of such a magnetic resolver or maintenance such as failure.

  In order to achieve the above object, one aspect of the present invention includes a rotating shaft that is rotatably arranged, an annular rotor that is disposed on the rotating shaft and that can rotate integrally with the rotating shaft, The rotor is arranged so as to sandwich the rotor from above and below in the axial direction of the rotary shaft, and the respective projecting salient poles project toward the rotor at predetermined intervals along the circumferential direction. And a coil wound around each of the salient poles of the stator, and the inductance of the coil varies depending on the rotation angle of the rotor. A magnetic resolver for detecting a rotation angle of the stator, and having a connecting portion for connecting the pair of stators, the connecting portion facing the rotor so as to sandwich the rotor between the pair of stators; In the arranged state, And to hold that they are spaced from each each other the pair of stator at predetermined intervals.

  Therefore, according to one aspect of the present invention, since the rotor is interposed between the pair of stators, even if the air gap amount is different between the upper side and the lower side with the rotor as a boundary, the respective output phases By combining these, the total output as each sensor can be made the total output value. For this reason, the rotor moves up and down in the axial direction, the distance between the upper stator and the lower stator is increased (and vice versa). Even when the air gap with the rotor fluctuates, it is possible to eliminate the influence on the total output value. Thus, the air gap can be easily managed.

  In addition, since the fluctuation of the air gap does not affect the total output in this way, the variation range of the magnetic flux resistance accompanying the rotor rotation is large, and the variation mode of the magnetic flux resistance accompanying the rotor rotation is smooth and stable. Therefore, the detection accuracy of the rotation angle can be efficiently increased, and the reliability in the detection accuracy of the rotation angle can be sufficiently improved practically.

  Further, since the rotor and the input / output wire harness for excitation and detection can be shared, the number of necessary wire harnesses can be reduced, the cost can be reduced, and the structure can be simplified. .

  In the aspect of the invention, it is preferable that the connecting portion is integrally formed using the same magnetic material as the pair of stators. Therefore, the pair of stators can have a function dedicated to excitation output on the upper side and a function dedicated to detection on the lower side with the rotor as a boundary. At this time, the upper and lower functions may be reversed.

  Here, for example, when the upper stator is set as the excitation / output side, the magnetic flux output from the salient pole in the upper stator flows to the corresponding salient pole in the lower stator on the detection side via the outer peripheral edge of the rotor. After that, a magnetic path is formed that flows to the upper salient pole via the connecting portion. That is, in this case, the magnetic path is formed in the axial direction of the rotating shaft from the upper stator to the lower stator via the rotor. Therefore, it is possible to provide two or more types of excitation / output coils by providing different coils for each salient pole in the excitation / output side stator. At this time, it goes without saying that a detection coil corresponding to each salient pole is also provided in the stator on the detection side.

  Furthermore, in one aspect of the present invention, it is preferable that the connecting portion is molded separately using an insulating material different from the pair of stators. For this reason, each pair of stators has a function as an independent rotation angle sensor with the rotor as a boundary, and by adjusting the respective output phases, the total output as each sensor can be made the total output value. it can.

  As a result, the rotor moves up and down in the axial direction, and the distance between the upper stator and the stator on the lower side is narrowed, and the distance between the lower stator and the stator on the lower side is increased (and vice versa). Even when the air gap with the rotor fluctuates, it is possible to eliminate the influence on the total output value.

  Here, for example, the magnetic flux outputted from the salient pole on the excitation / output side in the upper stator passes to another salient pole in the upper stator, i.e., the salient pole on the detection side via the opposing surface of the rotor. A flowing magnetic path is formed. At this time, a magnetic path similar to that of the upper stator is formed in the lower stator. That is, in this case, the magnetic path is formed in the radial direction of each stator. For this reason, even if a malfunction or the like occurs in the sensor function in either the upper or lower stator, a fail-safe function capable of detecting the rotation angle of the rotor using the other stator is provided. Can do.

  Moreover, in one aspect of the present invention, the pair of stators has a cutout portion for attaching and detaching a rotor unit integrally including the rotating shaft and the rotor, so that maintenance or assembly such as failure can be performed. The assemblability at the time can be greatly improved.

  According to the present invention, it is possible to provide a magnetic resolver that can facilitate the management of the air gap and can sufficiently improve the reliability in the detection accuracy of the rotation angle in practice.

1 is a schematic configuration diagram partially showing a first embodiment of a magnetic resolver according to the present invention in cross section. It is a top view which shows the magnetic resolver of FIG. 1 seeing from A direction. It is a top view which shows the modification in the magnetic resolver of FIG. 1 seeing from A direction. It is a schematic block diagram which shows partially the 2nd Example of the magnetic resolver by this invention in a cross section.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. In the following description, a detailed description of a well-known technique, a well-known procedure, a well-known architecture, a well-known circuit configuration, etc. (hereinafter, “well-known matter”) will be omitted, but this will simplify the description. Therefore, it does not intentionally exclude all or part of these known matters. Such known matters are known to those skilled in the art at the time of filing of the present invention, and are naturally included in the following description.

[First Example]
FIG. 1 is a schematic configuration diagram showing a partial sectional view of a magnetic resolver according to a first embodiment of the present invention as a whole, and FIG. 2 is a top view showing the magnetic resolver of FIG. . In the present specification, “upward” does not indicate the upper side in the vertical direction in the installed state of the magnetic resolver, but is along the rotating shaft on which the rotor is disposed, regardless of the installed state of the magnetic resolver. In addition, it refers to the side on which the stator on which the connection connector for performing excitation / output or detection with the rotor as a center is provided. Therefore, it goes without saying that “downward” refers to the side where the stator on the opposite side exists.

  In FIG. 1, a magnetic resolver 1 includes a stator portion 2 having a pair of stators 21 and 22, a rotor 3 interposed between the pair of stators 21 and 22, a rotary shaft 4 disposed rotatably, and a stator. And a terminal 5 that is a connector for performing excitation, output, or detection with respect to coils 24, 25, 26, and 27, which will be described later, provided in 21 and 22, and inductances in the coils 24, 25, 26, and 27 are The rotation angle of the rotor 3 is detected by utilizing the change depending on the rotation angle of the rotor 3.

  The rotor 3 is disposed so as to be able to rotate integrally with the rotating shaft 4 while the rotating shaft 4 is inserted through the center of the rotor 3. Here, the rotor 3 is made of an iron-based magnetic material and has an annular shape. The rotor 3 is typically composed of a laminate of electromagnetic steel plates (for example, silicon iron). In the present embodiment, the outer contour line of the rotor 3 is described with respect to a case where a constant diameter is used. However, the present invention is not limited to this and may be defined by a periodically changing diameter. At this time, as the outer contour line, N (N is an axial multiple angle) that defines a change cycle of the diameter may be appropriately determined according to a necessary resolution. Specifically, the rotor 3 is not limited to an annular shape with a constant outer contour line, and a wide wave of outer contour lines such as a petal shape can also be applied.

  The pair of stators 21 and 22 is formed in an annular shape using an iron-based magnetic material, typically an electromagnetic steel sheet (for example, silicon iron). In this case, as shown in FIG. 2, the pair of stators 21 and 22 are each provided with a through hole 2 a for inserting the rotating shaft 4 in a substantially central portion. The pair of stators 21 and 22 are arranged to face the rotor 3 so as to sandwich the rotor 3 from the vertical direction in the axial direction of the rotary shaft 4. Further, as shown in FIG. 2, the pair of stators 21 and 22 are provided with projecting salient poles 21a, 21b,... 21f projecting toward the rotor 3 at predetermined intervals along the circumferential direction. ing. In addition, excitation / output or detection coils 24, 25, 26, and 27 are wound around the salient poles 21a, 21b,.

  In the case of the present embodiment, the stator portion 2 has a connecting portion 23 that connects the pair of stators 21 and 22, and the connecting portion 23 connects the pair of stators 21 and 22 to each other. The rotor 3 is sandwiched (intervened) between the two and is held in a state of being separated at a predetermined interval.

  The connecting portion 23 is integrally formed using the same magnetic material as the pair of stators 21 and 22. Therefore, the pair of stators 21 and 22 can have a function dedicated to excitation output on the upper side and a function dedicated to detection on the lower side with the rotor 3 as a boundary. At this time, the upper and lower functions may be reversed.

  Here, for example, when the upper stator 21 is set as the excitation / output side, the magnetic flux output from the salient pole 21a in the upper stator 21 corresponds to the lower stator 22 serving as the detection side via the outer peripheral edge of the rotor 3. After flowing to the salient pole 22a, a magnetic path is formed that flows to the upper salient pole 21a via the connecting portion 23. That is, in this case, the magnetic path is formed in the axial direction of the rotating shaft 4 from the upper stator 21 to the lower stator 22 via the rotor 3.

  Therefore, in the stator 21 on the excitation / output side, it is possible to provide different coils 24, 25 for the salient poles 21a, 21b, and to form two or more types of excitation / output coils 24, 25. At this time, it goes without saying that the detection coils 26 and 27 corresponding to the salient poles 22a and 22b are similarly provided in the stator 22 on the detection side.

  As described above, in the magnetic resolver 1 according to this embodiment, since the rotor 3 is interposed between the pair of stators 21 and 22, the air gap AG1 on the upper side and the lower side with the rotor 3 as a boundary. Even when the interval (amount) of AG2 is different, the total output as each sensor can be made the total output value by matching the respective output phases.

  For this reason, the rotor 3 moves up and down in the axial direction of the rotary shaft 4, the distance between the air gap AG <b> 1 with the upper stator 21 is narrowed, and the distance between the air gap AG <b> 2 with the lower stator 22 is expanded. (The opposite is also true) By this, even when the air gaps AG1 and AG2 between the pair of stators 21 and 22 and the rotor 3 fluctuate, the total output value is not affected. it can. Thus, management of the air gaps AG1 and AG2 can be facilitated.

  In addition, since the fluctuations of the air gaps AG1 and AG2 do not affect the total output in this way, the change width of the magnetic flux resistance accompanying the rotation of the rotor 3 is large, and the magnetic flux resistance accompanying the rotation of the rotor 3 is large. Since the change mode is smooth and stable, the detection accuracy of the rotation angle can be increased efficiently, and the reliability in the detection accuracy of the rotation angle can be sufficiently improved in practice.

  Furthermore, since the rotor 3 and the input / output wire harness W / H for excitation and detection can be shared, the number of necessary wire harnesses W / H can be reduced, the cost is reduced, and the structure is simplified. It is also possible to make it.

  As mentioned above, although the form for implementing this invention was demonstrated using 1st Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, various deformation | transformation are carried out. And substitutions can be added.

  For example, in the above-described embodiment, the case where the pair of stators 21 and 22 has an annular shape has been described. However, for example, as shown in FIG. The shaft 4 and the rotor 3 may be assembled and integrated to provide a notch 21A for attaching and detaching the rotor unit 6 (in FIG. 3, only the stator 21 side is shown for convenience. A notch is similarly formed on the stator 22 side.)

  In this case, since the rotor unit 6 in which the rotating shaft 4 and the rotor 3 are assembled and integrated can be attached and detached so as to fit into the notch portion 21A, the number of assembling steps at the time of assembling or maintenance such as failure can be reduced. This can be reduced and the work can be facilitated. Thus, it is possible to achieve an effect that the working efficiency (assembly property) can be remarkably improved.

[Second Embodiment]
FIG. 4 which shows the parts corresponding to those in FIG. 1 with the same reference numerals is a schematic structural view partially showing a cross section of a magnetic resolver 10 as a second embodiment according to the present invention. The connecting portion 203 for connecting 201 and 202 is substantially the same as the magnetic resolver 1 of the first embodiment described above except that the connecting portion 203 is formed separately from the pair of stators 201 and 202 using an insulating material. It is configured.

  In this case, each of the pair of stators 201 and 202 has a function as an independent rotation angle sensor with the rotor 3 as a boundary, and by adjusting the respective output phases, the total output as each sensor is output as a whole. Can be a value.

  As a result, the rotor 3 moves up and down in the axial direction, the distance between the air gap AG1 between the rotor 3 and the upper stator 201 is narrowed, and the distance between the air gap AG2 with the lower stator 202 is increased (and vice versa). Thus, even when the air gaps AG1 and AG2 between the pair of stators 201 and 202 and the rotor 3 fluctuate, it is possible to eliminate the influence on the total output value.

  In particular, in the magnetic resolver 20 of the present embodiment, for example, the magnetic flux output from the salient pole 201a on the excitation / output side of the upper stator 201 is adjacent to the upper stator 201 via the opposing surface of the rotor 3. Are formed, that is, a magnetic path that flows to the salient pole 201b on the detection side. At this time, a magnetic path similar to that of the upper stator 201 is formed in the lower stator 202. That is, in this case, the magnetic path is formed in the radial direction in each of the stators 201 and 202. For this reason, even when a malfunction or the like occurs in the sensor function in either the upper or lower stator 201, 202, the rotation angle of the rotor 3 can be detected using the other stator 202, 201. A fail-safe function can be provided.

  Here, as is well known, fail-safe means that if a failure (fault) occurs due to an erroneous operation or malfunction of a component or system, it is surely controlled safely, or at least almost certainly safe. (That is, the possibility of dangerous failure is very low). That is, it is a design philosophy that assumes that a failure such as a failure, an operation error, or a design failure will occur in advance, and that a device is devised to minimize damage when it occurs.

  As described above, in the magnetic resolver 10 according to the present embodiment, since the rotor 3 is interposed between the pair of stators 201 and 202, the air gap AG1 on the upper side and the lower side with the rotor 3 as a boundary. Even when the interval (amount) of AG2 is different, the total output as each sensor can be made the total output value by matching the respective output phases.

  For this reason, the rotor 3 moves up and down in the axial direction of the rotary shaft 4, the distance between the air gap AG <b> 1 between the upper stator 201 and the air gap AG <b> 2 between the lower stator 202 increases. (The opposite is also true) By this, even when the air gaps AG1, AG2 between the pair of stators 201, 202 and the rotor 3 fluctuate, the total output value is not affected. it can. Thus, management of the air gaps AG1 and AG2 can be facilitated.

  In addition, since the fluctuations of the air gaps AG1 and AG2 do not affect the total output in this way, the change width of the magnetic flux resistance accompanying the rotation of the rotor 3 is large, and the magnetic flux resistance accompanying the rotation of the rotor 3 is large. Since the change mode is smooth and stable, the detection accuracy of the rotation angle can be increased efficiently, and the reliability in the detection accuracy of the rotation angle can be sufficiently improved in practice.

  Furthermore, since the rotor 3 and the input / output wire harness W / H for excitation and detection can be shared, the number of necessary wire harnesses W / H can be reduced, the cost is reduced, and the structure is simplified. It is also possible to make it.

  In addition, in the case of the magnetic resolver 10 according to the present embodiment, the connecting portion 203 is formed separately from the pair of stators 201 and 202 using an insulating material, so that the pair of stators 201 and 202 is the rotor 3. Each has a function as an independent rotation angle sensor, and the total output as each sensor can be made the total output value by matching the respective output phases.

  As a result, the rotor 3 moves up and down in the axial direction, the distance between the air gap AG1 between the rotor 3 and the upper stator 201 is narrowed, and the distance between the air gap AG2 with the lower stator 202 is increased (and vice versa). Thus, even when the air gaps AG1 and AG2 between the pair of stators 201 and 202 and the rotor 3 fluctuate, it is possible to eliminate the influence on the total output value.

  Furthermore, in the magnetic resolver 10 of the present embodiment, the magnetic flux output from the salient pole 201a on the excitation / output side in the upper stator 201 is transmitted to another adjacent one in the upper stator 201 via the opposing surface of the rotor 3. A magnetic path that flows to the salient pole, that is, the salient pole 201b on the detection side is formed. At this time, a magnetic path similar to that of the upper stator 201 is formed in the lower stator 202. That is, in this case, since the magnetic path is formed in the radial direction in each of the stators 201 and 202, even if a sensor function failure or the like occurs in either the upper or lower stator 201 or 202, the other It is possible to achieve an effect of providing a fail-safe function capable of detecting the rotation angle of the rotor 3 using the stators 202 and 201.

  As mentioned above, although the form for implementing this invention was demonstrated using 2nd Example, this invention is not limited to such Example at all, and various deformation | transformation within the range which does not deviate from the summary of this invention. And substitutions can be added.

  For example, also in the magnetic resolver 10 of the second embodiment described above, the notches can be provided in the stators 201 and 202 as in the magnetic resolver 1 of the first embodiment. In this case, as in the case of the magnetic resolver 1 of the first embodiment described above, the rotor unit 6 in which the rotating shaft 4 and the rotor 3 are assembled and integrated is attached and detached so as to fit into the notch 21A. (See FIG. 3). For this reason, it is possible to reduce the number of assembling steps at the time of assembling or maintenance such as failure, and to facilitate such work. Thus, it is possible to achieve an effect that the working efficiency (assembly property) can be remarkably improved.

  The present invention can be used in the automobile manufacturing industry, the automobile parts manufacturing industry, and the like. The appearance, weight, size, running performance, etc. of the vehicle to be mounted are not limited.

DESCRIPTION OF SYMBOLS 1, 10 ... Magnetic resolver 2, 20 ... Stator part 21, 22, 201, 202 ... Stator 23, 203 ... Connection part 3 ... Rotor 4 ... Rotating shaft 5 ... Terminal 21a, 22a, 21b, 22b, 201a, 202a, 201b 202b ... salient poles 24, 25, 26, 27, 204, 205, 206, 207 ... coils AG1, AG2 ... air gap W / H ... wire harness

Claims (4)

A rotating shaft that is rotatably arranged, an annular rotor that is arranged on the rotating shaft and can rotate integrally with the rotating shaft, and an up-down direction in the axial direction of the rotating shaft with respect to the rotor A pair of stators disposed opposite to each other so as to sandwich the rotor, and projecting salient poles projecting toward the rotor at predetermined intervals along the circumferential direction, and the stator A coil that is wound around each of the salient poles, and a magnetic resolver that detects the rotation angle of the rotor by utilizing the fact that the inductance of the coil changes according to the rotation angle of the rotor,
A connecting portion for connecting the pair of stators;
The connecting portion holds the pair of stators spaced apart from each other at a predetermined interval in a state where the rotor is sandwiched between the pair of stators so as to sandwich the rotor. Resolver. The magnetic resolver according to claim 1, wherein the connecting portion is integrally formed using a magnetic material similar to that of the pair of stators. The magnetic resolver according to claim 1, wherein the connecting portion is formed separately using an insulating material different from the pair of stators. The pair of stators is
The magnetic resolver according to any one of claims 1 to 3, further comprising a notch for attaching and detaching a rotor unit integrally including the rotating shaft and the rotor.