JP5541080B2 - Resolver rotor fixing structure - Google Patents

Description

  The present invention includes a resolver rotor fixing structure including a laminated steel plate formed by laminating a plurality of steel plates, the resolver rotor having a detection surface for detecting a rotation angle on the outer peripheral surface, and a shaft on which the resolver rotor is fitted and fixed. About.

  The rotating electrical machine includes a rotor and a stator facing the rotor. The rotor includes a rotor core fixed to a rotatable rotor shaft, and rotates under the influence of a rotating magnetic field generated in the stator. The rotating electrical machine is mounted on an electric vehicle such as a hybrid vehicle or an electric vehicle, and is used as an electric motor or a generator for driving wheels.

  In addition, it is considered to provide a resolver in order to detect the rotation angle of the rotor of such a rotating electrical machine. For example, as a conventional resolver, a resolver rotor fixed to a rotor shaft, a resolver stator fixed to a case of a rotating electrical machine so as to face the periphery of the resolver rotor, and outputting an output signal corresponding to the rotation angle of the resolver rotor; A structure comprising:

  The resolver rotor includes a laminated steel plate formed by laminating a plurality of steel plates, and has a detection surface for detecting a rotation angle on an outer peripheral surface. The detection surface is configured, for example, by providing protrusions protruding radially outward at a plurality of circumferentially equidistant locations on the outer peripheral surface of the laminated steel plate. The resolver rotor is fitted into the outer peripheral surface of the rotor shaft by press fitting. Further, the entire inner peripheral surface of the annular metal press-fitting ring is fitted to the outer peripheral surface of the rotor shaft from one side in the axial direction of the resolver rotor, and the resolver rotor is pressed against the one side in the axial direction by the press-fitting ring. The resolver rotor is pressed in the axial direction by a press-fitting ring against a stepped surface provided in the outer peripheral surface of the rotor shaft and facing in the axial direction. Thereby, the resolver rotor is clamped in the axial direction between the step surface and the press-fitting ring, and is fixed to the rotor shaft.

  Patent Document 1 discloses a resolver rotor fixing structure, in which an outer detection surface having a plurality of salient pole portions is provided on the radially outer side of the resolver rotor, and between the resolver rotor and the rotation shaft that is the rotor shaft. Describes that the press-fitting portion and the non-press-fitting portion are provided side by side in the axial direction. For this purpose, the rotary shaft is provided with a large-diameter portion having a large diameter and a small-diameter portion having a small diameter. The large-diameter portion constitutes a press-fit portion, and the small-diameter portion constitutes a non-press-fit portion.

  Patent Document 2 discloses a resolver rotor fixing structure in which an outer detection surface having a plurality of salient pole portions is provided on the radially outer side of the resolver rotor, and the shaft fixing hole at the center of the resolver rotor is rotated. It is described that a plurality of press-fitting protrusions that press against the shaft are provided. The press-fitting protrusions are arranged at angular positions corresponding to valleys between salient pole parts adjacent in the circumferential direction.

JP 2010-25700 A JP 2010-48775 A

  When the resolver rotor is fixed to the rotor shaft using a press-fit ring as described above, it is necessary to use a press-fit ring that is a separate member from the resolver rotor, which increases the number of parts and increases costs and assembly man-hours. Is a factor. Further, since the resolver rotor including the laminated steel plates is fitted into the rotor shaft by press-fitting, the resolver rotor that is a rotation angle detection component is deformed, and the outer circumferential surface that is the detection surface for detecting the rotation angle of the resolver rotor is uneven. Due to the deformation, an angular error is caused in the detection of the rotation angle of the rotor. On the other hand, in order to suppress the deformation due to the press-fitting of the resolver rotor, it is conceivable to loosen the fitting with the rotor shaft, but in this case, a sufficient fixing force for the rotor shaft required for the resolver rotor is obtained. It may not be obtained. If sufficient fixing force cannot be obtained in this way, the detection accuracy of the rotation angle of the rotor may not be improved. For this reason, it is desired to realize a structure in which the press-fitting ring can be omitted, the number of parts and the number of assembling steps can be reduced, and the detection accuracy of the rotation angle of the rotor can be improved.

  On the other hand, in the case of the structures described in Patent Documents 1 and 2, the press-fitting ring is omitted, but the rotor shaft is provided with a large-diameter portion for press-fitting the resolver rotor to constitute the resolver rotor. Four or more steel plates are fitted into the large diameter portion by press fitting. For this reason, the shape accuracy of the detection surface for detecting the rotation angle provided on the outer peripheral surface of the resolver rotor is likely to deteriorate, and there is room for improvement in terms of improving the detection accuracy of the rotation angle of the rotor.

  An object of the present invention is to eliminate the press-fitting ring and to effectively improve the detection accuracy of the rotation angle of the resolver rotor in the resolver rotor fixing structure.

The resolver rotor fixing structure according to the present invention includes a laminated steel plate formed by laminating a plurality of steel plates, a resolver rotor having a detection surface for detecting a rotation angle on an outer peripheral surface, a shaft on which the resolver rotor is fitted and fixed, The resolver rotor fixing structure includes: an inner peripheral surface of one end steel plate provided at one axial end of the laminated steel plate, or two ends provided at both axial ends of the laminated steel plate. A laminated steel plate having a press-fitting claw portion provided on the inner peripheral surface of the steel plate , and a groove portion provided on the inner peripheral surface of the end steel plate so as to be recessed radially on both sides in the circumferential direction of the press-fitting claw portion. has an axial one end steel plate or axial two end portions press-fitting claw portion with the end steel plate more is formed on the steel plate at both ends of the one end, provided axially intermediate portion of the laminated steel plate, pressed Including a steel plate without a press-fitting claw part without a claw part, and a resolver for press-fitting By press-fitting the claw portion provided at an end portion steel with parts only, it is fixed by press-fitting to the outer peripheral surface of the shaft, the inner peripheral surface of the press-fitting claw portion without steel sheet, a peripheral surface of the shaft, for press fitting The resolver rotor fixing structure is characterized in that a gap is fitted to an outer peripheral surface on the same cylindrical surface as a portion to which a steel plate with a claw is fitted .

  According to the resolver rotor fixing structure according to the present invention, it is possible to omit the press-fitting ring and to effectively improve the detection accuracy of the rotation angle of the resolver rotor.

It is a schematic sectional drawing which shows a rotary electric machine provided with the resolver rotor fixing structure of embodiment which concerns on this invention. It is AA sectional drawing of FIG. 1 which shows the resolver rotor fixing structure of embodiment which concerns on this invention. It is BB sectional drawing of FIG. It is the C section enlarged view of FIG. It is a perspective view which takes out and shows a resolver rotor from FIG. It is the elements on larger scale of FIG. It is a figure which shows the circumferential direction part of the fitting part of the one side edge part steel plate of FIG. 6, and a rotor shaft. In the comparative example which deviates from this invention, it is a figure which shows the relationship between the tightening allowance of a fitting part, the removal load of a resolver rotor, and the amount of deformation | transformation at the time of fitting all the steel plates of a resolver rotor to a rotor shaft by press fit. . In embodiment which concerns on this invention, when a resolver rotor is fitted to a rotor shaft, it is a figure which shows the relationship between the fastening allowance of a fitting part, the removal load of a resolver rotor, and a deformation amount.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. 1 to 7 show an example of an embodiment according to the present invention. The rotating electrical machine provided with the resolver rotor fixing structure of the present embodiment is used as a motor generator of a hybrid vehicle, for example. The motor generator has a function as a motor or a generator.

  As shown in FIG. 1, the rotating electrical machine 10 includes a case 12, a rotor shaft 14 rotatably supported inside the case 12, a rotating electrical machine rotor 16 fixed to the rotor shaft 14, and the rotating electrical machine rotor 16. A rotating electrical machine stator 18 fixed to the case 12 so as to face the outside in the radial direction, and a resolver 20 are provided. The rotating electrical machine stator 18 is configured by winding a three-phase stator coil 24 around a plurality of teeth provided on a stator core 22. The rotating electrical machine rotor 16 includes a rotor core 26 fixed to the rotor shaft 14 and permanent magnets (not shown) provided at a plurality of locations in the circumferential direction of the rotor core 26. By supplying a three-phase (U-phase, V-phase, W-phase) alternating current to the three-phase stator coil 24, a rotating magnetic field is generated in the rotating electrical machine stator 18, and the rotating electrical machine rotor 16 is affected by the rotating magnetic field. Receive and rotate. In addition, the structure of a rotary electric machine rotor and a rotary electric machine stator is not limited to such a structure, The conventionally well-known various structures are employable.

  On the other hand, the resolver 20 includes a resolver rotor 28 fitted and fixed to the radially outer side of the rotor shaft 14 and a resolver stator 30 fixed to the inner side of the case 12 so as to face the radially outer side of the resolver rotor 28. I have. The resolver stator 30 is formed by laminating a plurality of magnetic steel plates, and includes a resolver stator core 32 having a plurality of teeth and a resolver stator coil 34 wound around the teeth via an insulating material such as a resin. The resolver stator coil 34 includes, for example, a one-phase excitation coil to which an excitation voltage is applied, and a two-phase output coil that outputs an output signal having different phases according to the rotation angle of the resolver rotor 28 based on the excitation of the excitation coil. Each coil is wound around the teeth.

  The resolver stator coil 34 is connected to a control device (not shown) provided outside, and the control device excites the excitation coil and detects the rotation angle of the resolver rotor 28 based on an output signal obtained from the output coil. Since the resolver rotor 28 rotates in synchronization with the rotating electrical machine rotor 16, the rotational angle of the rotating electrical machine rotor 16 can be detected by detecting the rotational angle of the resolver rotor 28.

  On the other hand, the resolver rotor fixing structure includes a resolver rotor 28 and a rotor shaft 14 as shown in FIGS. The resolver rotor 28 includes a plurality of laminated steel plates obtained by laminating steel plates having the same shape except for a part, and a central hole 36 for fitting with the rotor shaft 14 is formed at the center. Further, the outer peripheral surface of the resolver rotor 28 is a non-circular shape having a crest 38 provided at two positions on the opposite side in the diametrical direction and a flat section 40 provided at two positions in the circumferential direction that are 90 degrees out of phase with the crest 38. It has a shape. Such an outer peripheral surface of the resolver rotor 28 faces the resolver stator 30 (FIG. 1) and constitutes an outer detection surface 42 for detecting a rotation angle. That is, the resolver rotor 28 has the outer detection surface 42 on the outer peripheral surface.

  The shape of the outer peripheral surface of the resolver rotor 28 is not limited to the illustrated example. For example, various shapes such as protrusions protruding in the radial direction at a plurality of locations in the circumferential direction of the cylindrical surface are formed. Can be adopted.

  As shown in FIGS. 4 to 6, the resolver rotor 28 includes two end steel plates 44 and other end steel plates 46, which are two end steel plates provided at both axial ends of the laminated steel plates, and two sheets. And an intermediate steel plate 48, which is a plurality of steel plates other than the end steel plates 44 and 46, sandwiched between the end steel plates 44 and 46. Each of the end steel plates 44 and 46 and the intermediate steel plate 48 is provided with a hole 50 for forming the center hole 36 at the center. A key protrusion 52 (FIGS. 2 and 5) that protrudes radially inward is provided at a position that aligns with each other when the steel plates are stacked in a part of the hole 50 in the circumferential direction. The key protrusions 52 are laminated together in a state where the steel plates are laminated, and constitute a key 54 (FIGS. 2, 3, and 5) that is long in the axial direction. As shown in FIG. 3, when the resolver rotor 28 is fitted to the rotor shaft 14, the key 54 is arranged in the key groove 56 formed in a part of the outer circumferential surface of the rotor shaft 14, thereby the rotor Positioning of the resolver rotor 28 in the circumferential direction with respect to the shaft 14 is performed.

  Further, as shown in FIG. 2, a plurality of circumferential locations on the inner circumferential surface of the hole 50, which is the inner circumferential surface of one single-side end steel plate 44 provided at one axial end of the resolver rotor 28 (example shown in the figure). In this case, claw portions 58 are provided at four locations). Each claw portion 58 is provided at a plurality of symmetrical positions with respect to a virtual plane P passing through the circumferential center position of the key projection 52 and the hole center O. As shown in FIG. 5 to FIG. 7, each claw portion 58 has a substantially rectangular cross section, and its tip edge slightly protrudes radially inward from the inner peripheral edge of the hole body 60 on both sides in the circumferential direction. The tip edge of each claw portion 58 may be formed in an arc shape with the hole center O as its center. As shown in FIG. 2, each claw portion 58 is pressed against the outer peripheral surface of the rotor shaft 14 at a portion corresponding to the claw width W (FIG. 7). The plurality of claw portions 58 may be provided at circumferentially equidistant positions on the inner peripheral surface of the hole portion 50.

  In addition, on the inner peripheral surface of the hole 50 of the one-side end steel plate 44, a plurality of groove portions 62 are provided so as to be recessed in the radial direction on both circumferential sides of each claw portion 58. As shown in FIGS. 6 and 7, the leading edge of each claw portion 58 protrudes radially inward from the inner peripheral edge of the hole body 60 of the one-side end steel plate 44, and the inscribed circle of each claw portion 58 is inscribed. The press-fit inner diameter D1 (FIG. 7), which is the diameter, is smaller than the outer diameter da (FIG. 7) of the portion of the rotor shaft 14 to which the resolver rotor 28 is fitted (D1 <da). Further, the insertion inner diameter D2 (FIG. 7), which is the inner diameter of the hole body 60 of the one-side end steel plate 44, is larger than the outer diameter da of the portion of the rotor shaft 14 to which the resolver rotor 28 is fitted (D2). > Da). The press-fit inner diameter D1 is smaller than the insertion inner diameter D2 (D1 <D2).

  As shown in FIG. 3, a large-diameter portion 64 having an outer diameter larger than that of other portions is provided in a part of the outer peripheral surface of the rotor shaft 14 in the axial direction. In addition, a step surface 66 that is a continuous portion with other portions is provided. The resolver rotor 28 is fitted to a portion of the rotor shaft 14 that is distant from the large-diameter portion 64 on one side in the axial direction, and the step surface 66 is radially inward of the other axial side surface (the right side surface in FIG. 3) of the resolver rotor 28. The part is abutted in the axial direction.

  As shown in FIG. 4, the one-side end steel plate 44 is fitted into the rotor shaft 14 by press fitting only at each claw portion 58. That is, the tip of the claw portion 58 is in pressure contact with the outer peripheral surface of the rotor shaft 14 in a state inclined with respect to the radial direction. The hole body 60 (FIG. 7) of the one-side end steel plate 44 is fitted to the outer peripheral surface of the rotor shaft 14 with a clearance fit. Further, the inner peripheral surface of each intermediate steel plate 48 provided in the axially intermediate portion of the resolver rotor 28 is fitted into the outer peripheral surface of the rotor shaft 14 with a gap around the entire periphery except for the key protrusion and both side portions thereof. Has been. As a result, the resolver rotor 28 is fitted and fixed to the outer peripheral surface of the rotor shaft 14 by press-fitting only by the claw portion 58 provided on the one-side end steel plate 44. In the illustrated example, the number of the claw portions 58 provided on the one-side end steel plate 44 is four, but the number of the claw portions 58 is not limited to this, and the holding force of the resolver rotor 28 with respect to the rotor shaft 14 is not limited thereto. Various changes can be made accordingly.

  As described above, the outer detection surface 42 that is the outer peripheral surface for detecting the rotation angle of the resolver rotor 28 is slightly deformed as the tip of the claw portion 58 is brought into pressure contact with the outer peripheral surface of the rotor shaft 14. Occur. For this reason, when the inner circumferential portion of the resolver rotor 28 is deformed in the radial direction, the claw portions 58 are provided at a plurality of locations in the circumferential direction where the sensitivity of the shape change of the outer circumferential surface is low. This is preferable from the viewpoint of suppressing deterioration in shape accuracy. For example, although the crest portions 38 and the flat portions 40 are alternately formed on the outer peripheral surface of the resolver rotor 28, claw portions 58 are provided at a plurality of circumferential positions where the change in the radial direction position relative to the circumferential direction of the outer peripheral surface is small. It is preferred that

  According to such a resolver rotor fixing structure, unlike the above-described conventional structure, the press-fitting ring can be omitted and the detection accuracy of the rotation angle of the resolver rotor 28 can be effectively improved. That is, the resolver rotor 28 is fixed to the outer peripheral surface of the rotor shaft 14 by press-fitting only with the claw portions 58 provided at a plurality of positions in the circumferential direction of the one-side end steel plate 44, so that the non-uniform deformation occurring on the outer detection surface 42 is prevented. Only one single-side end steel plate 44 can be provided, and the accuracy of rotation angle detection can be improved. In addition, it is not necessary to provide a press-fitting ring that is a member other than the laminated steel plate as in the conventional structure, and the number of parts can be reduced, thereby reducing the cost. Further, the deformation direction and deformation amount due to the press-fitting of the resolver rotor 28 can be easily regulated by the shape of the claw portion 58 and the groove portion 62. For example, by devising the claw part 58 into an optimal shape, it is possible to effectively suppress the occurrence of non-uniform deformation in the outer detection surface 42 by absorbing pressure input by deformation of the claw part 58. Further, by devising the shape of the claw portion 58, the sensitivity of the rotation angle detection error generation to the deformation of the claw portion 58 and the sensitivity of the tightening error generation are lowered, and the fitting dimension between the resolver rotor 28 and the rotor shaft 14 is reduced. The robustness against the above is improved, and it is easy to secure the holding force of the parts. Moreover, since the groove part 62 dented in radial direction is provided in the both sides of the nail | claw part 58, it becomes easy to set the shape of the nail | claw part 58 to an optimal shape.

  FIG. 8 to FIG. 9 show the results of simulating the effects of changes in the interference and comparing the results using the resolver rotor fixing structure of the comparative example and the present embodiment that deviate from the present invention. In the following description, elements equivalent to those shown in FIGS. 1 to 7 are denoted by the same reference numerals. FIG. 8 shows the relationship between the tightening margin of the fitting portion, the unloading load of the resolver rotor, and the amount of deformation when all the steel plates of the resolver rotor are fitted to the rotor shaft 14 by press fitting in a comparative example that departs from the present invention. FIG. FIG. 9 is a diagram showing the relationship between the tightening margin of the fitting portion, the unloading load and the deformation amount of the resolver rotor 28 when the resolver rotor 28 is fitted to the rotor shaft 14 in the present embodiment.

  First, the simulation result of the comparative example will be described with reference to FIG. In the comparative example, each steel plate of the resolver rotor has the same configuration as that of the present embodiment shown in FIGS. 1 to 7, and the key protrusion is provided with a claw portion on the inner peripheral surface of the hole portion provided in the center portion. All of the steel plates are fitted and fixed to the rotor shaft 14 by press-fitting. In such a comparative example, the relationship between the tightening allowance and the amount of deformation of the resolver rotor when the tightening allowance for the rotor shaft 14 is changed, and the relationship between the tightening allowance and the unloading load on the rotor shaft 14 were obtained by simulation. In terms of design, the “deformation amount” is required to be set to be equal to or less than a preset “deformation amount allowable upper limit” in terms of ensuring the detection accuracy of the resolver. Further, in order to secure a necessary fixing force of the resolver rotor, the “missing load” is required to be set to be equal to or more than a preset “missing upper limit of missing load” in design.

  FIG. 8 shows a simulation result of the comparative example. As is clear from FIG. 8, the straight line α representing the relationship between the amount of deformation and the tightening allowance and the straight line β representing the relationship between the unloading load and the tightening allowance are both positive and the tightening allowance increases. The amount of deformation and the unloading load are large. Further, the tightening allowance T1 corresponding to the “deformation amount allowable upper limit” is smaller than the tightening allowance T2 corresponding to the “missing load allowable lower limit” (T1 <T2).

  As described above, the tightening allowance is required to be T1 or less from the viewpoint of suppressing the deformation amount of the resolver rotor 28, and the tightening allowance is required to be equal to or greater than T2 from the viewpoint of securing the removal load of the resolver rotor 28. However, in the case of the comparative example, the tightening allowance for achieving both the suppression of the deformation amount and the securing of the removal load is not established. For example, if the press-fitting allowance, which is a tightening allowance, is increased to T2 or more in order to secure the holding force of the resolver rotor with respect to the rotor shaft 14, the deformation of the outer detection surface 42 increases beyond the “deformation amount allowable upper limit”. It is difficult to ensure sufficient detection accuracy.

  Next, the simulation result of this embodiment will be described with reference to FIG. In the present embodiment, as described above, the resolver rotor 28 is fitted and fixed to the rotor shaft 14 by press fitting only with the claw portion 58 of the one-side end steel plate 44. In this embodiment, as in the case of the comparative example described above, the relationship between the tightening allowance and the deformation amount of the resolver rotor 28 and the relationship between the tightening allowance and the unloading load on the rotor shaft 14 were obtained by simulation.

  FIG. 9 shows the simulation result of the present embodiment. Also in the case of FIG. 9, the straight line α representing the relationship between the deformation amount and the tightening allowance and the straight line β representing the relationship between the unloading load and the tightening allowance are both positive, and the deformation amount increases as the tightening allowance increases. The unloading load is also increased. Further, the tightening allowance T1a corresponding to the “deformation amount allowable upper limit” is larger than the tightening allowance T2a corresponding to the “missing load allowable lower limit” (T1a> T2a).

  As described above, the tightening margin is required to be T1a or less from the viewpoint of deformation amount suppression, and the tightening allowance is required to be T2a or more from the viewpoint of securing the unloading load. Any of these requirements can be satisfied by setting within the tightening margin management range that is in the range of T2a to T1a. In FIG. 9, the tightening allowance management width is indicated by an arrow and a hatched area. For this reason, the interference allowance which can aim at coexistence with deformation | transformation amount suppression and missing load ensuring can be set. As a result, according to the present embodiment, for example, the shape of the claw portion 58 provided on the one-side end steel plate 44 is devised, and the resolver rotor 28 is press-fitted into the rotor shaft 14 only by the claw portion 58 of the one-side end steel plate 44. It was confirmed that the holding force of the resolver rotor 28 and the rotation angle detection performance can be secured by fixing.

  In the present embodiment, of the two end steel plates 44 and 46 provided at both axial ends of the resolver rotor 28, the resolver rotor 28 is attached to the rotor shaft 14 only by the claw portions 58 of the one end steel plate 44. The case of fixing by press fitting has been described. However, the present invention is not limited to this, for example, at a plurality of locations in the circumferential direction on the inner circumferential surface of the hole provided at the center of each of the two end steel plates 44 and 46 provided at both axial ends of the resolver rotor 28. It is also possible to fix the resolver rotor 28 to the outer peripheral surface of the rotor shaft 14 by press-fitting only with the claw portions 58 provided on the end steel plates 44 and 46. In this case, the intermediate steel plate 48 is sandwiched in the axial direction by the two end steel plates 44 and 46 on both sides. In this case, since the resolver rotor 28 can be fixed to the rotor shaft 14 without pressing any one end steel plate against the step surface 66 of the rotor shaft 14 in the axial direction, the step surface 66 can be omitted. .

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 12 Case, 14 Rotor shaft, 16 Rotating electrical machine rotor, 18 Rotating electrical machine stator, 20 Resolver, 22 Stator core, 24 Stator coil, 26 Rotor core, 28 Resolver rotor, 30 Resolver stator, 32 Resolver stator core, 34 Resolver stator coil 36 Central hole, 38 Crest, 40 Flat, 42 Outer detection surface, 44 One end steel plate, 46 Other end steel plate, 48 Middle steel plate, 50 Hole, 52 Key projection, 54 Key, 56 Key groove, 58 claw part, 60 hole body, 62 groove part, 64 large diameter part, 66 step surface.

Claims (1)

A resolver rotor including a laminated steel plate formed by laminating a plurality of steel plates, and having a detection surface for detecting a rotation angle on an outer peripheral surface;
A resolver rotor fixing structure comprising a shaft to which a resolver rotor is fitted and fixed,
The resolver rotor
Claw portions for press-fitting provided on the inner peripheral surface of one end steel plate provided at one axial end of the laminated steel plate or the inner peripheral surfaces of two end steel plates provided on both axial ends of the laminated steel plate When,
A groove portion provided on the inner peripheral surface of the end steel plate so as to be recessed in the radial direction on both sides in the circumferential direction of the press-fitting claw portion;
Laminated steel plate is provided with an axial one end steel plate or axial two end portions press-fitting claw portion with the end steel plate more is formed on the steel plate at both ends of the one end, in the axially intermediate portion of the stacked steel plates The resolver is fixed to the outer peripheral surface of the shaft by press-fitting only with the press-fitting claw provided on the end- fitting steel plate with the claw for press-fitting. ,
The inner peripheral surface of the steel plate without press-fitting claw is the outer peripheral surface of the shaft, and is gap-fitted to the outer peripheral surface on the same cylindrical surface as the portion to which the steel plate with press-fitting claw portion is fitted. Resolver rotor fixing structure.

Images