JP5605683B2 - Rotation angle detection or rotation synchronization device - Google Patents

Description

  The present invention relates to a structure of a rotation angle detection or rotation synchronization device such as a resolver and a synchro having a stator and a rotor.

  Conventionally, a rotation angle that has a stator and a rotor and outputs a detection signal corresponding to the rotation angle of the rotor with respect to the stator by utilizing the fact that the mutual inductance between the stator and the rotor changes depending on the rotation position of the rotor with respect to the stator. A resolver as a detection device is known (see, for example, Patent Document 1). Here, FIG. 21 is a diagram showing the structure of a conventional resolver. The resolver 900 of FIG. 21 includes a stator 910 in which a plurality of stator teeth 920 that protrude inward from the inner peripheral surface 910a are formed. A rotor 980 is rotatably provided inside the stator 910. The rotor 980 is provided to be rotatable with respect to the stator 910 so that the gap permeance with the stator teeth 920 is changed by rotation around the rotation axis.

  A stator winding 950 is wound around each stator tooth 920 via a bobbin 941 made of an insulating resin. The stator winding 950 is composed of a plurality of phase windings. Specifically, the stator winding 950 receives an excitation signal and outputs an excitation winding 951 that excites the stator teeth 920 and a detection signal corresponding to a gap permeance that changes as the rotor 980 rotates. Winding 952.

  Each stator tooth 920 is provided with a resin bobbin 941 so as to cover the outside. Then, a stator winding 950 is wound around each bobbin 941. This is aimed at effects such as ensuring insulation between the stator winding 950 and the stator teeth 920. Note that an insulating cap 940 is configured by integrally including these bobbins 941.

  In the resolver 900 having such a configuration, when an excitation signal is input between the connector pins 971 to which both ends of the excitation winding 951 are connected, the stator teeth 920 are excited. In this state, when the rotor 980 rotates and the gap permeance changes, a detection signal corresponding to the gap permeance is generated in the output winding 952. Then, based on the detection signal output from the connector pin 971 connected to the end line of the output winding 952, the rotation angle of the rotor 980 is detected.

  Conventionally, synchronization as a rotation synchronization device having the same structure as a resolver is known. This synchronizer has a stator and rotor similar to those of a resolver, and is a three-phase signal whose phase angle is shifted by 120 degrees from the output winding wound around the stator teeth and changes in a sine wave shape according to the rotation angle of the rotor. Is output. When two syncs having the same structure are connected, the rotor of one sync is rotated so as to have the same rotation angle as the rotor of the other sync based on the difference between signals output from the syncs. That is, these two syncs are synchronized. Thus, the synchros are generally used in pairs of two, and in this case, one is called a synchro transmitter and the other is called a sync receiver.

JP 2003-344107 A

  By the way, in the resolver and the synchro, in order to improve the detection accuracy of the rotation angle, it is necessary to wind the excitation winding and the output winding with high accuracy. However, in the resolver 900 disclosed in Patent Document 1, since the stator teeth 920 are provided inward, the excitation winding 951 and the output winding 952 cannot be wound with high accuracy, and the detection accuracy is low. It was a big obstacle to improvement. In addition, the conventional stator 910 has a sufficient thickness by, for example, laminating a plurality of electromagnetic steel plates, so that there is a problem that the manufacturing process of the resolver and the synchro is complicated.

  The present invention has been made in view of the above problems, and an object thereof is to simplify the structure of a rotation angle detection or rotation synchronization device such as a resolver and a synchro.

In order to solve the above problems, the rotation angle detection or rotation synchronization device of the present invention is composed of a ring-shaped flat plate made of a magnetic material, and a plurality of stator teeth standing on the flat plate surface are formed at the peripheral edge of the flat plate. A stator,
A rotor made of a magnetic material and provided so as to be rotatable with respect to the stator so that a gap permeance with the stator teeth is changed by rotation around a rotation axis;
A stator winding wound around the stator teeth for outputting a detection signal corresponding to a rotation angle of the rotor;
Wherein the inside or outside of a plurality of stator teeth, each surface and a ring-shaped ring member provided so as to abut the plurality of stator teeth, Ru comprising a.

  According to this, since the stator teeth are erected with respect to the flat plate surface, there is no need to wind the stator winding in a narrow space inside the stator. Therefore, the stator winding can be wound with high accuracy. Further, since the stator is formed of a flat plate, the structure of the stator can be simplified. Further, a ring member is provided inside or outside the plurality of stator teeth, and the inclination of each stator tooth with respect to the flat plate of the stator can be positioned by the ring member. Therefore, since the gap permeance between the stator teeth and the rotor becomes accurate, the accuracy of the detection signal can be improved. Further, since the inclination of the stator teeth is restricted by the ring member, it is possible to prevent the inclination of the stator teeth from changing afterwards.

Also, in the rotation angle detection or rotation synchronization device of the present invention, each of the plurality of stator teeth is mounted such that a part of the front end side of the stator teeth is exposed, and the stator winding is wound from the outside. A resin insulating cap formed with a plurality of bobbins;
A locking portion protruding from the upper end portion of the bobbin toward the tip of the stator teeth, and locking the ring member,
The ring member is formed with a locked portion that is locked to the locking portion.

  According to this, the resin teeth are mounted on the stator teeth, and the stator winding is wound via the bobbins, so that the stator teeth and the stator winding can be reliably insulated. Further, when the bobbin is attached to the stator teeth, a part of the tip end side of the stator teeth is exposed, so that magnetic flux can be efficiently exchanged between the exposed portion and the rotor. Therefore, the accuracy of the detection signal can be improved. In addition, since a locking portion is provided so as to protrude from the upper end portion of the bobbin, and a locked portion locked to the locking portion is formed on the ring member, the engagement between the locking portion and the locked portion is formed. By stopping, the ring member can be prevented from coming off.

Further, in the rotation angle detection or rotation synchronization device of the present invention, the front locking portion is extended until it protrudes from the tip of the stator teeth,
The locking portion and the locked portion of the ring member are locked at a portion protruding from the tip of the stator teeth.

  According to this, when the locking member and the locked portion of the ring member are locked at the portion protruding from the tip of the stator teeth, the ring member is provided inside or outside the stator teeth. The deformation of the stator teeth can be suppressed.

It is a disassembled perspective view of the structural example of the resolver 100 of 1st embodiment. 2 is a perspective view of a stator 200. FIG. It is a perspective view of the insulating cap 400 of 1st embodiment. It is the figure which showed the 1st bobbin 410a and the latching | locking part 420a of 1st embodiment. It is the figure which showed the ring member 500 of 1st embodiment. It is the figure which showed the attachment state of the ring member 500. FIG. It is explanatory drawing of a stator winding | coil. It is the figure which showed typically the direction of the magnetic flux in a certain time when the rotor 300 is a rotation state. 2 is a flowchart of an example of a method for manufacturing the resolver 100. FIG. It is a disassembled perspective view of the structural example of the resolver 101 of 2nd embodiment. It is a perspective view of the insulation cap 401 of 2nd embodiment. It is the figure which showed the ring member 501 of 2nd embodiment. It is the figure which showed the attachment state of the ring member. It is sectional drawing of the resolver which concerns on the modification 1. FIG. FIG. 6 is a view showing a state in which a ring member 502 is fixed with a caulking 710. It is the figure which showed the state fixed with the adhesive agent 720 of the ring member 502. FIG. It is explanatory drawing in the case of fixing the ring member 502 by fitting with the projection part 512 and the through-hole 212c. It is the figure which replaced with the projection part 512 of FIG. 17 and showed the convex part 513. FIG. FIG. 6 is a cross-sectional view of a resolver when the present invention is applied to an inner rotor type resolver as a second modification. It is the figure which showed the example of a use of the synchro. It is the figure which showed the structure of the conventional resolver.

(First embodiment)
Next, a first embodiment of a resolver as a rotation angle detection device according to the present invention will be described. FIG. 1 is an exploded perspective view of a configuration example of a resolver 100 according to the first embodiment. In FIG. 1, illustration of wiring such as stator windings is omitted. In FIG. 1, the resolver 100 has eight stator teeth and a one-phase excitation two-phase output type resolver will be described as an example. However, the present invention is not limited to this. FIG. 2 is a perspective view of the stator 200 of FIG. In FIG. 2, the same parts as those in FIG.

  The resolver 100 includes a stator (stator) 200 and a rotor (rotor) 300. The resolver 100 is a so-called outer rotor type rotation angle detection device. That is, the rotor 300 is provided outside the stator 200, and the stator 200 is provided in the stator 200 according to the rotation angle of the rotor 300 in a state where the stator 200 faces the inner circumferential side (inner diameter side) side surface of the rotor 300. The signal from the output winding constituting the winding changes.

  The stator 200 is configured using a ring-shaped flat plate 250 made of a magnetic material, and a plurality of stator teeth are provided on the flat plate 250. These stator teeth are provided so as to intersect the flat plate surface of the flat plate 250. In FIG. 1, the stator 200 includes eight stator teeth (saliency pole portions) 210 a, 210 b, 210 c, which are raised substantially perpendicular to the flat surface by bending (bending in a broad sense) or the like. 210d, 210e, 210f, 210g, 210h. The stator teeth 210a to 210h are formed on the flat plate 250 in advance by press processing, and then are raised so as to be substantially perpendicular to the surface of the flat plate 250 by bending press processing (bending processing in a broad sense). These stator teeth are formed on the inner edge (inner diameter side) of the annular flat plate 250. Further, in these stator teeth, at least the surface facing the side surface of the rotor 300 among the surfaces of each stator tooth is not a flat surface, and the inner diameter of the annular flat plate 250 when viewed along the direction of the rotation axis of the rotor 300. It forms so that it may become a part of circular arc centering on the point located in the side.

  The material of the flat plate 250 of the stator 200 made of such a magnetic material is desirably an electromagnetic steel plate, SPCC which is ordinary steel, or S45C or S10C which is carbon steel for mechanical structure. SPCC (Steel Plate Cold Commercial) is a cold-rolled steel sheet and steel strip defined in JIS G3141. S45C is a carbon steel material for machine structure defined in JIS G4051 and contains about 0.45% carbon. S10C is a carbon steel material for machine structure defined in JIS G4051 and contains about 0.10% carbon.

  The stator 200 having the above configuration is composed of a single magnetic steel plate as a magnetic material, so that it is expensive as a material cost and weak against bending by bending press processing, and maintains processing accuracy and reliability by bending. Compared to the case where a laminated magnetic steel sheet that is difficult to perform is adopted, the processing accuracy and reliability by bending can be maintained at low cost. Moreover, granular fracture of the magnetic material due to bending is prevented, and high-precision angle detection is enabled by ensuring the magnetic properties before bending.

  Further, a connector unit 600 provided with connector pins 471 to 476 for inputting an external excitation signal or outputting a detection signal is provided so as to protrude from the stator 200. As shown in FIG. 2, an extending portion 260 constituting a part of the connector unit 600 is provided so as to protrude with respect to the flat plate 250 of the stator 200. The extended portion 260 is formed by extending a flat plate 250 constituting the stator 200. Further, the extending portion 260 has a square frame shape with the inner side cut out.

  In addition, an annular insulating cap 400 is attached to the stator 200. Here, FIG. 3 is a perspective view of the insulating cap 400. A plurality of bobbins 410 a, 410 b, 410 c, 410 d, 410 e, 410 f, 410 g, 410 h provided in accordance with the positions of the stator teeth 210 a to 210 h of the stator 200 are integrally formed on the insulating cap 400. Each bobbin 410a-410h has an insertion hole (stator teeth insertion hole), and a stator tooth corresponding to the bobbin is inserted into the insertion hole, and a stator winding is wound around the outside. The direction of the insertion hole of each bobbin constituting the plurality of bobbins 410 a to 410 h is the direction of the rotation axis of the rotor 300.

  Further, hook-shaped locking portions protruding upward (in the direction of the tip of the stator teeth) are formed at the upper end portions of the bobbins 410a to 410h. Specifically, in accordance with the arrangement order on the right side from the bobbin 410a where the connection port of the connector unit 600 is arranged (counterclockwise arrangement order in FIG. 3), each of the bobbins 410a to 410h has first to eighth When numbers are assigned, locking portions 420a, 420c, 420e, and 420g are formed on the first bobbin 410a, the third bobbin 410c, the fifth bobbin 410e, and the seventh bobbin 410g, respectively. These locking portions 420a, 420c, 420e, and 420g are for locking a ring member described later.

  Here, FIG. 4 is a view for explaining the structures of the bobbins 410a to 410h and the locking portions 420a, 420c, 420e, and 420g. As representatives thereof, the first bobbin 410a and the locking portions connected thereto are shown. 420a is shown. Specifically, FIG. 4A is a side view of the bobbin and the locking part when the bobbin 410a and the locking part 420a are viewed from the left adjacent eighth bobbin 410h side along the circumferential direction. The figure is shown. FIG. 4B is a plan view of the bobbin and the locking portion, and shows a view of the bobbin 410a and the locking portion 420a in FIG. That is, in FIG. 4, the front side of the drawing is the eighth bobbin 410h side, the left side of the first bobbin 410a (locking part 420a) is the inside of the insulating cap 400 (rotor 300 side), and the first bobbin 410a (locking part). The right side of 420 a) is the outside of the insulating cap 400. The structures of the other bobbins 410b to 410h are the same as the structure of the first bobbin 410a in FIG. 4, and the structures of the other locking portions 420c, 420e, and 420g are the same as the structure of the locking portion 420a in FIG. Is the same.

  As shown in FIG. 4, the first bobbin 410a has a cylindrical main body 411 in which an insertion hole 414 is formed. At the upper end portion of the main body 411, a flange portion 412 is provided as a misalignment prevention means for preventing misalignment of the stator winding. The flange portion 412 forms recesses in the bobbins 410a to 410h so that the position of the stator winding does not shift in the recesses. As a result, the magnetic flux can be made uniform, and the reliability can be improved. Further, a base portion 413 constituting a part of the annular member of the insulating cap 400 is provided at the lower end portion of the main body 411. The main body 411 is provided upright at a right angle to the base 413.

  The insertion hole 414 formed in the main body 411 is formed so as to penetrate the bobbin 410a including the main body 411, the collar portion 412 and the base portion 413 vertically. The insertion hole 414 is a hole into which the corresponding stator tooth 210a is inserted. The direction of the insertion hole 414 coincides with the direction of the rotating shaft of the rotor 300, and the cross section thereof is substantially the same rectangular shape as the cross section of the stator teeth 210a. That is, when the insulating cap 400 including the bobbins 410a to 410h is attached to the stator teeth 210a to 210h, the stator teeth 210a to 210h are just inserted into the insertion holes 414. As a result, the bobbins 410a to 410h can be prevented from wobbling with respect to the stator teeth 210a to 210h, and as a result, the detection accuracy can be improved.

  The locking portion 420a is integrally formed of the same material as the bobbin 410a by injection molding, and is formed at the upper end portion of the collar portion 412. Specifically, the locking portion 420 a is formed at the upper end portion of the collar portion 412 so as to be adjacent to the opening of the insertion hole 414. More specifically, the locking portion 420 a is formed along the inner long side among the four sides of the rectangle that defines the opening of the insertion hole 414. The locking portion 420 a has a hook shape with the tip bent inside the insulating cap 400. Further, the locking portion 420a has a height lower than that of the stator teeth 210a when the stator teeth 210a are inserted.

  Returning to the description of the insulating cap 400, the insulating cap 400 includes a plurality of transition pins (projections) 480a, 480b, 480c, 480d, 480e, 480f, and 480g, and includes a plurality of bobbins 410a to 410h and a plurality of transition pins 480a to 480a. 480g is integrally formed. Each crossover pin constituting the plurality of crossover pins 480a to 480g is formed on a given circumference of the annular insulating cap 400 between the two bobbins. In addition, the crossover pin is not formed between the bobbins 410a and 410h. Each crossover pin has a cylindrical shape provided between two bobbins, and a conductor wire electrically connected to a stator winding wound around the outside of one bobbin has a tension at the crossover pin. It is hung in a holding state and is electrically connected to a stator winding wound around the other bobbin. This makes it difficult to resonate even when the distance between the two bobbins becomes long, and allows the number of turns of the stator winding to be adjusted in half-turn units. Here, in order to make it easy to give tension to the conducting wire and to maintain the state as long as possible, it is desirable that the crossover pin has a portion in the same direction as the direction of the rotating shaft of the rotor 300.

  Further, the insulating cap 400 is formed with a resin portion 450 constituting a part of the connector unit 600. The resin portion 450 is a resin constituting the insulating cap 400 and is formed integrally with the insulating cap 400. Further, the resin portion 450 is formed so as to protrude radially outward with respect to the annular portion in which the plurality of bobbins 410a to 410h are formed so as to correspond to the installation position of the extending portion 260 described above. Further, the resin portion 450 has a rectangular flat plate shape so as to correspond to the shape of the hollowed portion formed inside the extending portion 260. That is, the resin portion 450 is provided so as to fit into a hollow portion formed inside the extending portion 260. The resin portion 450 is provided with six connector pin insertion holes 461 to 466 in a line. Then, six connector pins 471 to 476 made of a conductive material are inserted into the connector pin insertion holes 461 to 466, respectively, in order to input excitation signals and output detection signals.

  And the connector part 600 is comprised from the extension part 260 and the resin part 450 by the resin part 450 being provided in the form fitted in the hollow part formed inside the extension part 260 (FIG. 1). reference). Thus, the connector unit 600 can be strengthened by connecting the resin portion 450 to the extending portion 260 around the resin portion 450.

  By mounting such an insulating cap 400 on the flat plate 250 of the stator 200, the stator 200 and the stator winding are electrically insulated. Thereby, the dielectric breakdown of the coil comprised by the stator winding can be prevented.

  An insulating cap 400 including such a bobbin and a locking portion is an injection using an insulating resin (insulating material) such as PBT (Polybutylene terephthalate) or PPT (Polypropylene terephthalate). It is formed by molding.

  As shown in FIG. 1, a ring member 500 is provided inside the plurality of stator teeth 210a to 210h. The ring member 500 is formed in a cylindrical shape (ring shape) from the inside of the plurality of stator teeth 210a to 210h so as to contact each surface (surface facing inward) of the plurality of stator teeth 210a to 210h. Is. Here, FIG. 5 is a view for explaining the structure of the ring member 500, FIG. 5 (a) shows a plan view of the ring member 500, and FIG. 5 (b) is a view in FIG. 5 (a). The AA sectional view of ring member 500 is shown. In FIG. 5 (a), the stator teeth 210a to 210h are moved upward in order to indicate which of the stator teeth 210a to 210h is provided with locked portions 530a, 530c, 530e, and 530g, which will be described later. The outline when viewed from the side is indicated by a broken line. Moreover, the AA line of Fig.5 (a) is a line which passes along the 3rd stator teeth 210c and the 8th stator teeth 210h. That is, in FIG.5 (b), the cross section of the part corresponding to the 3rd stator teeth 210c and the 8th stator teeth 210h of the ring member 500 is shown.

  In this ring member 500, the outer peripheral surface 510 of the cylinder constituting the ring member 500 is a surface that comes into contact with the surfaces of the stator teeth 210a to 210h. Further, on the outer peripheral surface 510, four locked portions 530a, 530c, 530e and 530g corresponding to the locking portions 420a, 420c, 420e and 420g formed on the upper end portion of the bobbin described above are formed. . That is, each locked portion is positioned at a position facing the surfaces of the first, third, fifth, and seventh stator teeth 210a, 210c, 210a, and 210g where the locking portions 420a, 420c, 420c, and 420g are formed. 530a, 530c, 530e, and 530g are formed.

  The locked portions 530a, 530c, 530e, and 530g are portions that are locked to the locking portions 420a, 420c, 420e, and 420g described above, and have a concave shape corresponding to the hook shape of the locking portions. The portions of the outer peripheral surface 510 other than the locked portions 530a, 530c, 530e, and 530g are flat surfaces. For example, as shown in FIG. 5B, the outer peripheral surface 510 facing the eighth stator teeth 210h is It is assumed to be a plane.

  In addition, a corner portion 520 that is bent at a right angle to the tube is formed on the upper end portion of the tube constituting the ring member 500 over the entire circumference. The corner portion 520 is a portion for positioning the ring member 500 in the vertical direction, and is in contact with the front end surfaces of the stator teeth 210a to 210h.

  Here, FIG. 6 is a diagram for explaining how the ring member 500 is provided with respect to the stator teeth, the bobbin, and the locking portion. Specifically, FIG. 6 shows components constituting the resolver 100 in the AA cross-sectional view of FIG. As shown in FIG. 6, the third stator teeth 210 c and the eighth stator teeth 210 h stand up with respect to the flat plate 250 of the stator 200. A third bobbin 410c is attached to the third stator teeth 210c, and an eighth bobbin 410h is attached to the eighth stator teeth 210h. The stator teeth 210c and 210h are partially exposed from the bobbins 410c and 410h. A rotor 300 is provided outside the stator teeth 210c and 210h. The inner peripheral surface of the rotor 300 is opposed to the surface of the portion exposed from the bobbins 410c and 410h of the stator teeth 210c and 210h. Further, the locking portion 420c is provided at the upper end portion of the third bobbin 410c, while the locking portion is not provided at the upper end portion of the eighth bobbin 410h.

  In such an arrangement relationship, the ring member 500 is provided inside the stator teeth 210a to 210h. At this time, the ring member 500 is provided such that the outer peripheral surface 510 of the ring member 500 and the surfaces facing the inner sides of the stator teeth 210a to 210h abut. Further, the ring member 500 is provided so that the corner portion 520 of the ring member 500 is in contact with the front end surfaces of the stator teeth 210a to 210h. Furthermore, the ring member 500 is provided so that the locked portions 530a, 530c, 530e, and 530g formed on the ring member 500 are in positions corresponding to the locking portions 420a, 420c, 420e, and 420g, respectively.

  Thereby, in the 1st stator teeth 210a (1st bobbin 410a), the latching | locking part 420a is engaged with the to-be-latched part 530a of the ring member 500. FIG. Further, in the third stator teeth 210 c (third bobbin 410 c), the locking portion 420 c is engaged with the locked portion 530 c of the ring member 500. Further, in the fifth stator teeth 210e (the fifth bobbin 410e), the locking portion 420e is engaged with the locked portion 530e of the ring member 500. Further, in the seventh stator teeth 210g (seventh bobbin 410g), the locking portion 420g is engaged with the locked portion 530g of the ring member 500. In addition, in FIG. 6, engagement with the latching | locking part 420c and the to-be-latched part 530c is shown. Thus, the ring member 500 is locked by the engagement between the locking portions 420a, 420c, 420e, and 420g and the locked portions 530a, 530c, 530e, and 530g.

  Further, as shown in FIG. 6, since the eighth stator teeth 210 h are not provided with a locking portion, the surface of the eighth stator teeth 210 h and the outer peripheral surface 510 of the ring member 500 are in that portion. The ring member 500 is not fixed only by contact.

  The ring member 500 is preferably formed of a non-magnetic material that does not affect the magnetism exchanged between the stator teeth 210a to 210h and the rotor 300. For example, the ring member 500 may be formed of resin by injection molding. It is formed of aluminum by die casting.

  By providing the ring member 500, the inclination of the stator teeth 210 a to 210 h with respect to the flat plate 250 can be positioned by the outer peripheral surface 510 of the ring member 500. That is, by making the cylindrical degree of the ring member 500 accurate, the inclination of each of the stator teeth 210a to 210h with respect to the flat plate 250 can be accurately made a right angle. Therefore, the gap permeance between the stator teeth 210a to 210h and the rotor 300 becomes accurate, so that the accuracy of the detection signal can be improved. Moreover, since the inclination of stator teeth 210a to 210h is regulated by ring member 500, it is possible to prevent the inclination of stator teeth 210a to 210h from being changed afterwards.

  The rotor 300 is formed from a single electromagnetic steel plate made of the same magnetic material as the stator 200. The rotor 300 is annular and is provided so as to be rotatable with respect to the stator 200. More specifically, the rotor 300 is provided to be rotatable with respect to the stator 200 such that gap permeance between the stator teeth of the stator 200 is changed by rotation around the rotation axis of the rotor 300. For example, the axial multiplication angle of the rotor 300 is “3”, and the inner diameter contour line on the inner diameter side in a plan view is changed in three cycles with respect to the circumference of the given radius with respect to the circumference of the given radius. It has a shape. Then, the gap permeance of the inner peripheral side surface of the rotor 300 facing the outer (outer diameter side, outer peripheral side) surface of the stator teeth raised with respect to the flat plate 250 changes in three cycles per rotation of the rotor 300. It is supposed to be. In addition to the electromagnetic steel plate, the rotor 300 may be made of SPCC, which is ordinary steel, or S45C or S10C, which is carbon steel for mechanical structure. The rotor 300 may be configured by laminating a plurality of electromagnetic steel plates.

  Next, the stator winding for extracting the detection signal output from the output winding by the rotation of the rotor 300 will be described. The stator winding is composed of an excitation winding and an output winding, and the signal of the output winding is changed by the rotation of the rotor 300 relative to the stator 200 while being excited by the excitation winding.

  Here, FIG. 7 is an explanatory diagram of stator windings wound around the stator teeth 210 a to 210 h of the stator 200. Specifically, FIG. 7A shows an explanatory view of the excitation winding 4 constituting the stator winding, and FIG. 7B shows an explanatory view of the output winding 5 constituting the stator winding. Is shown. FIGS. 7A and 7B are plan views of the resolver 100 viewed in the direction of the rotation axis of the rotor 300 of FIG. 1. The same parts as those in FIG. 7A schematically shows the winding direction of the excitation winding 4, and FIG. 7B schematically shows the winding direction of the output winding 5. As shown in FIG. In practice, the conductors that electrically connect the stator windings of each bobbin are routed through the jumper pins formed between them.

  As shown in FIG. 7A, the excitation winding 4 is wound such that the winding directions of adjacent stator teeth are opposite to each other. Then, both end lines of the excitation winding 4 are connected to any one of connector pins 471 to 476 provided on the resin portion 450. Here, when the connector pins 471 to 476 connected to the end lines of the excitation winding 4 are referred to as connector pins R1 and R2, an excitation signal is given between the connector pins R1 and R2, and the excitation winding 4 is excited. A signal is input. In addition, the excitation winding 4 wound around each stator tooth can be a coil winding, for example.

  Further, as shown in FIG. 7B, in order to obtain a two-phase detection signal, the output winding 5 is composed of two sets of winding members. The output winding 51 for obtaining the detection signal of the first phase (for example, the sin phase) of the two-phase detection signals is, for example, every other stator tooth from the stator teeth 210a to the stator teeth 210g counterclockwise. Wound around. Then, both end lines of the first-phase output winding 51 are connected to any of connector pins 471 to 476 provided in the resin portion 450, respectively. Here, when the connector pins 471 to 476 connected to the end line of the first phase output winding 51 are referred to as connector pins S1 and S3, the first phase detection signal is a signal between the connector pins S1 and S3. Is output.

  On the other hand, the output windings 52 for obtaining the detection signal of the second phase (for example, the cos phase) of the two-phase detection signals, for example, every other one from the stator teeth 210b to the stator teeth 210h counterclockwise. It is wound around the stator teeth. Then, both end lines of the second-phase output winding 52 are connected to any one of the connector pins 471 to 476 provided in the resin portion 450. Here, when the connector pins 471 to 476 connected to the end line of the output winding 52 of the second phase are called connector pins S2 and S4, the detection signal of the second phase is a signal between the connector pins S2 and S4. Is output. The output winding 5 wound around each stator tooth can be a coil winding, for example.

  As described above, the excitation winding 4 and the output winding of the first phase (sin phase) are provided on the outer sides of the bobbins 410a, 410c, 410e, and 410g into which the stator teeth 210a, 210c, 210e, and 210g are inserted into the insertion holes. The wire 51 is wound. The excitation winding 4 and the output winding 52 of the second phase (cos phase) are wound around the outside of each of the bobbins 410b, 410d, 410f, 410h into which the stator teeth 210b, 210d, 210f, 210h are inserted into the insertion holes. Turned.

  The winding direction of the excitation winding 4 is not limited to the direction shown in FIG. Further, the winding direction of the output winding 5 is not limited to the direction shown in FIG.

  In the resolver 100 having the above configuration, the following magnetic circuit is formed by the rotation of the rotor 300 with respect to the stator 200. Here, FIG. 8 is a plan view of the resolver 100 viewed in the direction of the rotation axis of the rotor 300 of FIG. 1, and the same parts as those in FIG. 1 or FIG. In FIG. 8, for convenience of explanation, the illustration of the insulating cap 400 is omitted, and the direction of the magnetic flux at a certain time when the rotor 300 is rotated with respect to the stator 200 is schematically shown. Moreover, in FIG. 8, the direction of the magnetic flux which passes through each stator teeth as a winding magnetic core is typically shown.

  The stator windings 4 and 5 are wound around the stator teeth 210 a to 210 h of the stator 200 via the insulating cap 400, and when the rotor 300 rotates, a magnetic circuit is formed between the adjacent stator teeth via the rotor 300. The As shown in FIG. 8, since the stator windings 4 and 5 are wound so that the direction of the magnetic flux passing through adjacent stator teeth is opposite, the rotor 300 is rotated to be wound around each stator tooth. The current generated in the stator windings 4 and 5 also changes, and for example, the current waveform generated in the output winding 5 can be made sinusoidal.

  Next, a method for manufacturing the resolver 100 in the present embodiment will be described. FIG. 9 is a flowchart of an example of a method for manufacturing the resolver 100. In order to manufacture the resolver 100, first, after processing the shape of the stator 200 in the stator shape processing step (step S10), in the bending press processing step (bending step), the stator teeth of the plate-like stator 200 are bent, A plurality of stator teeth are raised with respect to the flat plate surface (step S12). As a result, the stator teeth 210a to 210h are raised with respect to the flat plate 250 as shown in FIG.

  That is, in the stator shape processing step of Step S10, in order to perform the bending press processing of Step S12, a magnetic material made of one electromagnetic steel plate, SPCC which is ordinary steel, and S45C or S10C which is carbon steel for mechanical structure. A flat plate made of is pressed. And the annular flat plate 250 which has the stator teeth before a bending process in the edge part of an internal diameter side is formed. At that time, an extended portion 260 (see FIG. 2) that protrudes from the flat plate 250 is also formed of the same magnetic material as the flat plate 250. Specifically, for example, the flat plate is pressed to form a square flat plate, and the inside of the square flat plate is cut out to form the extending portion 260. The extension portion 260 may be formed at the same time as the formation of the stator teeth or at another time.

  In step S12, the plurality of stator teeth formed in step S10 are processed by bending press processing so that the root portions thereof have an R shape in a cross-sectional view. As a result, the stator teeth 210 a to 210 h are raised so as to be substantially perpendicular to the flat plate surface of the stator 200.

  Subsequently, as an insulating cap attaching step, the insulating cap 400 shown in FIG. 3 is integrally formed with the stator 200 formed in steps S10 and S12 by injection molding (step S14). That is, the insulating cap 400 is formed while being attached to the stator 200. At this time, the bobbins 410a to 410h and the locking portions 420a, 420c, 420e, and 420g described above are also formed. Further, the resin portion 450 formed integrally with the insulating cap 400 is formed in a state of being attached to the extending portion 260.

  Note that the insulating cap 400 shown in FIG. 3 may be formed in advance by injection molding, and the insulating cap 400 may be attached to the stator 200 from above the stator teeth 210a to 210h.

  Next, as a winding member attaching step, the stator windings of the stator teeth 210a to 210h raised in step S12 are used as winding cores, and the stator windings are wound around the bobbins 410a to 410h (steps). S16). An excitation winding 4 for excitation and an output winding 5 for detection are wound around each of the stator teeth thus raised.

  Next, as a ring member attaching step, first, the ring member 500 shown in FIG. 5 is formed of resin by injection molding or aluminum by die casting (step S18). After that, as described above, the ring member 500 is provided inside the stator teeth 210a to 210h, and each of the locking portions 420a, 420c, 420e, 420g and the locked portions 530a, 530c, 530e, 530g. Lock.

  Next, as a rotor processing step, one electromagnetic steel sheet is pressed to form the rotor 300 shown in FIG. 1 (step S20).

  Next, as a rotor mounting step, the rotor 300 is provided on the outer diameter side of the stator 200 so as to be rotatable with respect to the stator 200 (step S22). More specifically, in the rotor mounting process, the rotor 300 is configured such that the gap permeance between the inner peripheral side surface of the rotor 300 and each stator tooth of the stator 200 is changed by rotation around the rotation axis of the rotor 300. It is provided so as to be rotatable with respect to the stator 200. In FIG. 9, the rotor processing step is described as being performed after the winding member mounting step, but the present invention is not limited to this, and it may be performed at least prior to the rotor mounting step. As described above, the resolver 100 according to this embodiment is manufactured.

  As described above, according to the resolver 100 of the present embodiment, since the stator 200 is configured by the flat plate 250, the structure of the stator can be simplified. Further, since the stator teeth 210a to 210h formed on the stator 200 stand up with respect to the flat plate 250 of the stator 200, the insulation cap 400 can be easily attached and the stator winding is simply wound. be able to.

  Moreover, since the ring member 500 is provided inside the stator teeth 210a to 210h, the inclination of the stator teeth 210a to 210h with respect to the flat plate 250 can be positioned by the outer peripheral surface 510 of the ring member 500. Therefore, the gap permeance between the stator teeth 210a to 210h and the rotor 300 becomes accurate, so that the accuracy of the detection signal can be improved. Moreover, since the inclination of stator teeth 210a to 210h is regulated by ring member 500, it is possible to prevent the inclination of stator teeth 210a to 210h from being changed afterwards. Further, since the ring member 500 is locked at four positions by the locking portion and the locked portion, it is possible to prevent the ring member 500 from coming off.

(Second embodiment)
Next, a second embodiment of a resolver as a rotation angle detection device according to the present invention will be described with a focus on differences from the first embodiment. FIG. 10 is an exploded perspective view of a configuration example of the resolver 101 according to the second embodiment. In FIG. 10, illustration of wiring such as a stator winding is omitted, and the stator and the rotor are disassembled. FIG. 11 is a perspective view of the insulating cap 401 of FIG. 12 is a diagram for explaining the configuration of the ring member 501 of FIG. 10, FIG. 12 (a) is a plan view of the ring member 501, and FIG. 12 (b) is the ring member in FIG. 12 (a). BB sectional drawing of 501 is shown. In addition, in Fig.12 (a), the external line when each stator teeth 210a-210h is seen from upper direction is shown with the broken line. Moreover, the BB line of Fig.12 (a) is a line which passes along the 3rd stator teeth 210c and the 8th stator teeth 210h. 10-12, the same code | symbol is attached | subjected to the same part as 1st embodiment.

  As shown in FIG. 10, the resolver 101 of this embodiment is provided with a ring member 501 inside the stator teeth 210a to 210h, as in the first embodiment. However, the structure and fixing method of the ring member 501 are different from those of the first embodiment. Accordingly, the structure of the insulating cap 401 is also different from that of the first embodiment.

  As shown in FIG. 11, the insulating cap 401 has a locking portion 421a at the upper end of the first bobbin 410a and a locking portion 421c at the upper end of the third bobbin 410c, as in the first embodiment. A locking portion 421e is provided at the upper end of the fifth bobbin 410e, and a locking portion 421g is provided at the upper end of the seventh bobbin 410g. The locking portions 421a, 421c, 421e, and 421g are formed in the upper end portion of the collar portion 412 at the same position as the locking portion of the first embodiment, and have a hook shape whose tip is bent inward. (See FIG. 4). However, the heights of the locking portions 421a, 421c, 421e, and 421g are different from the height of the locking portion of the first embodiment. Specifically, the tips of the locking portions 421a, 421c, 421e, and 421g are higher than the tips of the stator teeth 210a to 210h. In other words, the locking portions 421a, 421c, 421e, and 421g are extended until they protrude from the tips of the stator teeth 210a to 210h. The locking portions 421a, 421c, 421e, and 421g have the same structure.

  The ring member 501 is formed of a non-magnetic material as in the first embodiment. Similarly to the first embodiment, the ring member 501 has a cylindrical shape so as to come into contact with the respective surfaces (surfaces facing inward) of the plurality of stator teeth 210a to 210h from the inside of the plurality of stator teeth 210a to 210h. It is formed in a shape (ring shape). Specifically, as shown in FIG. 12, the ring member 501 has a cylindrical main body cylinder portion 511. The outer peripheral surface 521 of the cylinder that forms the main body cylinder portion 511 is a surface that comes into contact with the surfaces of the stator teeth 210a to 210h.

  The ring member 501 has a cylindrical upper tube portion 531 having a diameter smaller than the diameter of the main body tube portion 511 provided at the upper end portion of the main body tube portion 511. The upper cylinder portion 531 is provided at the upper end portion of the main body cylinder portion 511 so that the axis of the upper cylinder portion 531 is coaxial with the main body cylinder portion 511. As a result, the ring member 501 is formed with a step 541 at the connection portion between the main body cylinder portion 511 and the upper cylinder portion 531. The step 541 functions as a locked portion that is locked to the locking portions 421a, 421c, 421e, and 421g. The main body cylinder portion 511 is formed such that the upper end portion thereof is higher than the tips of the stator teeth 210a to 210h, and accordingly, the upper cylinder portion 531 is positioned higher than the tips of the stator teeth 210a to 210h. Is provided. More specifically, the upper cylinder part 531 is provided at the same height as the locking parts 421a, 421c, 421e, 421g.

  Since the ring member 501 has the above structure, the step 541 is formed over the entire circumference of the ring member 501. That is, for example, as shown in FIG. 12B, the ring member 501 is also formed with a step 541 at a portion corresponding to the eighth stator teeth 210 h where no locking portion is provided.

  Here, FIG. 13 is a diagram for explaining how the ring member 501 is provided with respect to the stator teeth, the bobbin, and the locking portion. Specifically, FIG. 13 shows components constituting the resolver 101 in a cross-sectional view taken along the line BB in FIG. In FIG. 13, description of components that are not changed from the first embodiment is omitted.

  As shown in FIG. 13, a locking portion 421c is provided at the upper end of the third bobbin 410c so as to protrude in the direction of the tip of the stator teeth 210c. As for the latching | locking part 421c, the hook-shaped part of the front-end | tip protrudes from the front-end | tip of the stator teeth 210c. On the other hand, no locking portion is provided at the upper end of the eighth bobbin 410h.

  In such an arrangement relationship, the ring member 501 is provided inside the stator teeth 210a to 210h. At this time, the outer peripheral surface 521 of the main body cylinder portion 511 is brought into contact with the surfaces of the stator teeth 210a to 210h. Further, the engaging portions 421a, 421c, 421e, and 421g are engaged with a step 541 formed at the connection portion between the main body cylinder portion 511 and the upper cylinder portion 531. FIG. 13 shows the engagement between the locking portion 421c and the step 541. As described above, the ring member 501 is locked at the portion protruding from the tip of the stator teeth 210a to 210h by the engagement between the locking portions 421a, 421c, 421e, 421g and the step 541. Furthermore, the lower end part of the main body cylinder part 511 is brought into contact with the upper end surfaces of the bobbins 410a to 410h. Therefore, the vertical displacement of the ring member 501 is restricted.

  As shown in FIG. 13, since the eighth stator teeth 210 h are not provided with a locking portion, the surface of the eighth stator teeth 210 h and the outer peripheral surface 521 of the main body cylinder portion 511 are included in that portion. The ring member 501 is not fixed.

  Moreover, the resolver 101 of this embodiment is manufactured in the same procedure (flow chart of FIG. 9) as 1st embodiment. At this time, in the insulating cap attaching process in step S14, the insulating cap 401 formed with the locking portions 421a, 421c, 421e, and 421g is formed and attached to the stator 200. Moreover, in the ring member attachment process of step S18, the ring member 501 of FIG. 12 is formed and provided inside the stator teeth 210a to 210h.

  As described above, in this embodiment, since the ring member 501 is provided inside the stator teeth 210a to 210h, the same effect as that of the first embodiment can be obtained. Further, since the ring member 501 is locked at a portion protruding from the tip of the stator teeth 210a to 210h, deformation of the stator teeth 210a to 210h when the ring member 501 is provided inside the stator teeth 210a to 210h is suppressed. be able to.

(Modification 1)
In the first and second embodiments, a locking portion is provided at the upper end portion of the bobbin, a locked portion is provided in the ring member, and the ring member is moved by engagement between the locking portion and the locked portion. It was fixed. However, it is not limited to this, For example, you may fix a ring member as follows.

  Here, FIG. 14 shows cross-sectional views corresponding to FIGS. 6 and 13 in the resolver according to the first modification. In addition, the same code | symbol is attached | subjected to the part same as 1st, 2nd embodiment. In addition, in FIG. 14, description is abbreviate | omitted about what does not change with 1st, 2nd embodiment.

  The ring member 502 according to the first modification is formed in a cylindrical shape as in the first embodiment, and the outer peripheral surface of the cylinder is in contact with the surfaces of the stator teeth 210a to 210h. Here, FIG. 15 and FIG. 16 are diagrams for explaining a fixing method of the ring member 502, and each show a detailed view of the broken line portion 700 of FIG. As shown in FIG. 15, ring member 502 and stator teeth (stator teeth 210 c in FIG. 15) may be fixed with caulking 710. Further, as shown in FIG. 16, the ring member 502 and the stator teeth (the stator teeth 210 c in FIG. 15) may be fixed with an adhesive 720. This can also prevent the ring member 502 from coming off. Further, in this case, it is not necessary to provide a locking portion at the upper ends of the bobbins 410a to 410h, and it is not necessary to provide a locked portion on the ring member 502.

  Moreover, FIG. 17 is a figure explaining another fixing method of a ring member. Specifically, FIG. 17A is a detailed view of the ring member 502 in the broken line portion 700 in FIG. 14, FIG. 17B is a detailed perspective view of the stator teeth 210c in the broken line portion 700 in FIG. (C) is the figure which showed the connection state of the ring member 502 and the stator teeth 210c in the broken-line part 700 of FIG. As shown in FIG. 17A, the ring member 502 is formed with a protrusion 512 as a protrusion protruding outward from the outer peripheral surface thereof. As shown in FIG. 17B, the stator teeth 210c are formed with through holes 212c as concave portions corresponding to the protrusions 512 of the ring member 502. Then, as shown in FIG. 17C, the ring member 502 may be fixed by inserting the protrusions 512 into the through holes 212c and fitting them together.

  Further, as shown in FIG. 18, instead of the protrusion 512 of FIG. 17A, the inner peripheral surface of the ring member 502 may be recessed to form a convex portion 513 on the outer peripheral surface. . In this case, the convex part 513 and the through-hole 212c (refer FIG.17 (b)) of the stator teeth 210c are fitted. In the case of FIGS. 17 and 18, it is desirable to form through holes having the same position and shape as the through holes 212c in all the stator teeth 210a to 210h. This is to make the magnetic characteristics of the stator 200 uniform. In addition, you may provide a convex part in the stator teeth side, and provide a recessed part in the ring member side.

(Modification 2)
In the above embodiment, an example of an outer rotor type resolver has been described, but the present invention can also be applied to an inner rotor type resolver. Here, FIG. 19 shows a cross-sectional view of a resolver according to the second modification. In FIG. 19, stator teeth 215 are formed standing on the stator 201. A bobbin 415 is attached to the stator teeth 215. Further, the stator teeth 215 are partially exposed from the bobbin 415 on the tip side. Rotor 301 is provided inside stator teeth 215. In the resolver having such a configuration, the ring member 503 is provided from the outside of the stator teeth 215 so as to come into contact with the outer surface 216 of the stator teeth 215. That is, the inner peripheral surface of the ring member 503 and the surface 216 of the stator teeth 215 are brought into contact with each other. According to this, since the ring member 503 is provided outside the stator teeth 215, the gap permeance between the stator teeth 215 and the rotor 301 can be made accurate. Therefore, detection accuracy can be improved.

(Third embodiment)
In the above embodiment, the example in which the present invention is applied to the resolver has been described. However, the present invention may be applied to synchronization as a rotation synchronization device. This synchro includes a stator winding (excitation winding, output winding) wound around a stator, a rotor, and stator teeth, and an insulating cap provided with a bobbin. The rotor rotates from the output winding. It is the same as the resolver in that it outputs a sine wave signal that changes in response to. The synchro is different from the resolver in that the output windings for three phases are wound around the stator teeth, and the output signals output from the respective output windings are shifted from each other by 120 degrees in phase angle. As described above, the synchro can be considered to be the same as the resolver except for the winding structure of the stator winding, and therefore the above embodiment can be applied to the synchro as it is. That is, by providing the ring member inside or outside the stator teeth, the inclination of the stator teeth with respect to the flat plate can be made accurate.

  Here, FIG. 20 is a diagram illustrating an application example of the synchro. As shown in FIG. 20, the synchronization is mainly used to synchronize the operation among a plurality of devices, and is generally used in a set of a synchronization transmitter and a synchronization receiver having the same structure. Specifically, in FIG. 20, a synchro transmitter 702 as a synchro is provided such that its rotating shaft 701 rotates in accordance with the operation of one device (transmitter side device, not shown). The synchro transmitter 702 outputs first-phase to third-phase signals (sine wave signals) that change according to the rotation angle of the connected device. Similarly, the sync receiver 703 as a sync is provided such that its rotating shaft 704 rotates in accordance with the operation of the other device (receiving device, not shown). The sync receiver 703 outputs first-phase to third-phase signals (sine wave signals) that change according to the rotation angle of the connected device. Then, the phases of the sync transmitter 702 and the sync receiver 703 are connected. With respect to these operations, (1) if the position of the rotor is different between the sync transmitter 702 and the sync receiver 703, a potential difference occurs between them, and current flows in each phase. (2) The rotor of the synchro receiver 703 is rotated by the current. That is, torque is generated. (3) With the rotation of the rotor (rotating shaft 704) of the sync receiver 703, the receiving-side device connected thereto is rotated. (4) When the position of the rotor of the sync receiver 703 is the same as the position of the rotor of the sync transmitter 702, no current flows in each phase. (5) When the current stops flowing, the rotation of the rotor of the sync receiver 703 is stopped. Therefore, the positions of the rotors of the synchro transmitter 702 and the sync receiver 703 are the same, that is, the operation of the devices is synchronized with the transmitting device and the receiving device. As described above, even if the present invention is applied to a synchro transmitter and a sync receiver that output a sine wave signal that changes according to the rotation of the rotor, similarly to the resolver, the inclination of the stator teeth with respect to the flat plate is accurately determined. This is preferable.

  Note that the resolver and the synchro according to the present invention are not limited to the above-described embodiment, and can be variously modified without departing from the scope of the claims. For example, the following modifications are also possible. .

  In the above-described embodiment, the locking portions are provided at four locations in a single jump, but any number of the locking portions may be provided. For example, you may provide a latching | locking part in the upper end part of all the bobbins. As a result, the ring member can be more firmly fixed. Moreover, you may provide a latching | locking part in two places on a diagonal. As a result, the structure can be simplified while fixing the ring member.

  In each of the above embodiments, the resolver has been described as being a one-phase excitation two-phase output type, but the present invention is not limited to this. The resolver in each of the above embodiments may be a signal having an excitation signal having a phase other than one phase, or a detection signal having a phase other than two phases.

  In each of the above embodiments, the stator material made of a magnetic material has been described as one electromagnetic steel plate, ordinary steel, or carbon steel material for mechanical structure, but the present invention is not limited to this.

  In each of the above embodiments, the rotor having a shaft angle multiplier “3” has been described as an example. However, the present invention is not limited to this, and for example, a rotor having a shaft angle multiplier “5” may be used.

4 Excitation winding (stator winding)
5 Output winding (stator winding)
100, 101 resolver (rotation angle detector)
200, 201 Stator 210a-210h, 215 Stator teeth 212c Through-hole (concave)
216 Surface of stator teeth 215 250 Flat plate 300, 301 Rotor 400, 401 Insulation cap 410a-410h, 415 Bobbin 411 Main body 412 Collar part 413 Base part 414 Insertion hole 420a, 420c, 420e, 420g, 421a, 421c, 421e, 421g Locking Portions 500, 501, 502, 503 Ring member 510 Outer peripheral surface of ring member 511 Main body cylinder portion 512 Protruding portion (convex portion)
513 Protruding part 521 Peripheral surface of main body cylinder part 520 Corner part 530a, 530c, 530e, 530g Locked part 531 Upper cylinder part 541 Step (locked part)
702 Synchro transmitter (synchronizer, rotation synchronizer)
703 Synchro receiver (synchronizer, rotation synchronizer)
710 Caulking 720 Adhesive

Claims (2)

A stator formed of a ring-shaped flat plate of magnetic material, and formed with a plurality of stator teeth standing on the flat plate surface at the peripheral edge of the flat plate;
A rotor made of a magnetic material and provided so as to be rotatable with respect to the stator so that a gap permeance with the stator teeth is changed by rotation around a rotation axis;
A stator winding wound around the stator teeth for outputting a detection signal corresponding to a rotation angle of the rotor;
A ring-shaped ring member provided from the inside or the outside of the plurality of stator teeth so as to come into contact with each surface of the plurality of stator teeth;
A resin insulating cap that is mounted on each of the plurality of stator teeth so that a part of the front end side of the stator teeth is exposed, and has a plurality of bobbins around which the stator winding is wound, and
A locking portion protruding from the upper end portion of the bobbin toward the tip of the stator teeth, and locking the ring member,
A rotation angle detection or rotation synchronization device , wherein the ring member is formed with a locked portion that is locked to the locking portion . The locking portion is extended until it protrudes from the tip of the stator teeth,
The rotation angle detection or rotation synchronization device according to claim 1, wherein the locking portion and the locked portion of the ring member are locked at a portion protruding from a tip of the stator teeth .

Images