Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
  • H02K11/01—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields, i.e. structural association with shields

Definitions

• the resolver stator In conventional rotating electric machines, the resolver stator is fixed to the housing, so the resolver stator comes into contact with a magnetic shield made of magnetic material. As a result, magnetic flux generated from the stator and rotor of the rotating electric machine flows into the magnetic shield, and this magnetic flux then flows from the magnetic shield into the resolver, resulting in a problem of reduced angle detection accuracy of the resolver.
• This disclosure discloses technology for solving the above-mentioned problems, and aims to provide a rotating electric machine that can improve the resolver's angle detection accuracy by suppressing the flow of magnetic flux generated from the stator and rotor of the rotating electric machine into the resolver and the resulting decrease in the resolver's angle detection accuracy.
• the rotating electric machine of the present disclosure comprises: A shaft, a rotor that rotates with the shaft; a stator disposed radially opposite the rotor with a gap therebetween; a housing that holds the shaft via a bearing and that houses the rotor and the stator; a resolver that detects a rotation angle of the rotor, the resolver is disposed between the bearing and the rotor in the axial direction of the shaft,
• the resolver is a resolver rotor disposed on the outer periphery of the shaft and rotating together with the shaft; a resolver stator disposed radially opposite the resolver rotor with a gap therebetween
• the resolver stator includes: a resolver stator core having an annular resolver stator core back portion and a plurality of resolver teeth portions protruding from a radially inner side of the resolver stator core back portion and formed at intervals in a circumferential direction; a plurality of resolver coils wound around each of the resolver teeth,
• the rotating electric machine disclosed herein can prevent magnetic flux generated by the stator and rotor of the rotating electric machine from flowing into the resolver, and the resulting decrease in the resolver's angle detection accuracy, thereby improving the resolver's angle detection accuracy.
• FIG. 1 is an axial cross-sectional view showing the configuration of a rotating electric machine according to a first embodiment
• FIG. 2 is a plan view showing the configuration of a resolver stator of the rotating electric machine shown in FIG. 1 .
• 2 is a plan view showing the configuration of a low magnetic permeability portion of the rotating electric machine shown in FIG. 1 as seen from the rotor side.
• 2 is a plan view showing the configuration of a magnetic shield as seen from the rotor side of the rotating electric machine shown in FIG. 1 .
• 2 is a plan view showing a configuration in which a resolver stator, a low magnetic permeability portion, and a magnetic shield are superimposed, as seen from the rotor side of the rotating electric machine shown in FIG. 1 .
• FIG. 1 is an axial cross-sectional view showing the configuration of a rotating electric machine according to a first embodiment
• FIG. 2 is a plan view showing the configuration of a resolver stator of the rotating electric machine shown in FIG. 1 .
• FIG. 2 is a plan view showing a configuration in which a resolver stator, a low magnetic permeability portion, and a magnetic shield are fixed, as seen from the rotor side of the rotating electric machine shown in FIG. 1.
• FIG. 2 is an enlarged cross-sectional view of a portion of the rotating electric machine shown in FIG. 1 .
• 4 is an axial cross-sectional view showing the configuration of another rotating electric machine according to the first embodiment;
• FIG. FIG. 10 is an axial cross-sectional view showing the configuration of a rotating electric machine according to a second embodiment.
• 10 is a plan view showing the configuration of a low magnetic permeability portion of the rotating electric machine shown in FIG. 9 as seen from the rotor side.
• FIG. 10 is a plan view showing a configuration in which a resolver stator, a low magnetic permeability portion, and a magnetic shield are superimposed, as seen from the rotor side of the rotating electric machine shown in FIG. 9 .
• FIG. 11 is an axial cross-sectional view showing a partial configuration of a rotating electric machine according to a third embodiment.
• 13 is a plan view showing a configuration in which a resolver stator, a low magnetic permeability portion, and a magnetic shield are superimposed, as seen from the rotor side of the rotating electric machine shown in FIG. 12.
• FIG. FIG. 10 is an axial cross-sectional view showing the configuration of a rotating electric machine according to a fourth embodiment.
• 15 is a plan view showing the configuration of a magnetic shield as seen from the resolver side of the rotating electric machine shown in FIG. 14.
• directions in the rotating electric machine 1 will be referred to as the axial direction Y of the central axis Q of the shaft 2, which is the center of rotation of the rotor 4, the circumferential direction Z, the radial direction X, the outer side X1 of the radial direction X, and the inner side X2 of the radial direction X. Therefore, directions in the stator 3 and other parts will also be explained using these directions as references.
• Fig. 1 is an axial cross-sectional view showing the configuration of a rotating electric machine according to embodiment 1.
• Fig. 2 is a plan view showing the configuration of a resolver stator of the rotating electric machine shown in Fig. 1.
• Fig. 3 is a plan view showing the configuration of a low magnetic permeability portion as viewed from the rotor side of the rotating electric machine shown in Fig. 1.
• Fig. 4 is a plan view showing the configuration of a magnetic shield as viewed from the rotor side of the rotating electric machine shown in Fig. 1.
• Figure 5 is a plan view showing a configuration in which a resolver stator, a low magnetic permeability section, and a magnetic shield are superimposed, as viewed from the rotor side of the rotating electric machine shown in Figure 1.
• Figure 6 is a plan view showing a configuration in which a resolver stator, a low magnetic permeability section, and a magnetic shield are fixed, as viewed from the rotor side of the rotating electric machine shown in Figure 1.
• Figure 7 is a cross-sectional view showing an enlarged portion of the rotating electric machine shown in Figure 1.
• Figure 8 is an axial cross-sectional view showing the configuration of another rotating electric machine according to embodiment 1.
• the rotating electric machine 1 has a shaft 2, a stator 3, a rotor 4, a housing 5, a bearing 6, and a resolver 8.
• the shaft 2 is made of a solid material, this is not limited to this.
• the shaft 2 can be a hollow shaft 2 with an oil passage in the axial direction Y, or a shaft 2 with a boss structure in which a member of the shaft 2 arranged along the central axis Q is connected to a cylindrical core holding portion and rotates together.
• the rotor 4 is mounted on the shaft 2 and rotates together with it.
• the rotor 4 has a cylindrical rotor core 41 and a permanent magnet 42 inserted into the rotor core 41.
• the rotor 4 rotates about the central axis Q via the shaft 2 due to the attractive force generated by the magnetic flux generated by the stator 3 and the magnetic flux generated by the rotor 4.
• the stator 3 is positioned opposite the rotor 4 on the outer side X1 in the radial direction X, with a gap G1 (see Figure 7) between them.
• the stator 3 has a cylindrical stator core 31 and a coil 32 wound around the stator core 31.
• the stator 3 is housed in the housing 5 by press-fitting or by being fixed with bolts or the like (not shown).
• the resolver 8 detects the rotation angle of the rotor 4.
• the resolver 8 is installed between the bearing 6 and the rotor 4 in the axial direction Y.
• the resolver 8 has a resolver stator 81 and a resolver rotor 82.
• the resolver rotor 82 is installed on the outer periphery of the shaft 2 and rotates together with the shaft 2.
• the resolver stator 81 is positioned opposite the resolver rotor 82 on the outer side X1 in the radial direction X, with a gap G2 (see Figure 7) between them.
• the resolver stator 81 has a resolver stator core 811 and a resolver coil 812.
• the central axis Q of the rotating electric machine 1 and the central axis Q of the resolver stator 81 are precisely coaxial and regulated in the radial direction X.
• a magnetic shield 9 which is a magnetic body formed in a ring shape around the shaft 2, is arranged between the resolver stator 81 and the rotor 4 in the axial direction Y.
• the magnetic shield 9 is made of, for example, an iron-based material.
• the outer shape of the magnetic shield 9 and the outer shape of the low-permeability portion 7 are configured in a ring shape.
• the magnetic shield 9 can prevent the magnetic flux generated by the stator 3 and the magnetic flux generated by the rotor 4 from flowing into the resolver 8, thereby improving the angle detection accuracy of the resolver 8. Furthermore, because the low-permeability portion 7 is positioned between the resolver stator 81 and the magnetic shield 9 in the axial direction Y, a constant distance is maintained between the magnetic shield 9 and the resolver 8, and because magnetic flux does not easily pass through the low-permeability portion 7, the magnetic flux generated by the stator 3 and rotor 4 that flows through the magnetic shield 9 can be prevented from flowing into the resolver 8, further improving the angle detection accuracy of the resolver 8.
• the resolver stator 81 has a plurality of elongated fixing holes 80 formed in the circumferential direction Z that penetrate in the axial direction Y in the resolver stator core back portion 801, which is located outside X1 in the radial direction X from the resolver coil 812.
• the low magnetic permeability portion 7 has a plurality of fixing holes 70 formed in the circumferential direction Z that penetrate in the axial direction Y.
• the magnetic shield 9 has a plurality of fixing holes 90 formed in the circumferential direction Z that penetrate in the axial direction Y.
• the fixing holes 80, 70, 90 of the resolver stator 81, low magnetic permeability section 7, and magnetic shield 9 are formed at the same locations in the circumferential direction Z and radial direction X.
• the fixing holes 80, 70, 90 are configured to communicate in the axial direction Y.
• the outer periphery of the resolver stator 81 is formed with a plurality of positioning recesses 800 in the circumferential direction Z, recessed toward the inner side X2 in the radial direction X.
• the low magnetic permeability section 7 is formed with positioning holes 700 at positions different from the fixing holes 70.
• the magnetic shield 9 is formed with positioning holes 900 at positions different from the fixing holes 90.
• a positioning pin 500 is formed on the housing 5.
• a recess 800 in the resolver stator 81 is inserted into the positioning pin 500, thereby regulating the position of the resolver 8 in the circumferential direction Z.
• the positioning hole 700 in the low-permeability section 7 and the positioning hole 900 in the magnetic shield 9 are then inserted into the positioning pin 500, thereby positioning the low-permeability section 7 and the magnetic shield 9.
• the positioned resolver stator 81, low-permeability section 7, and magnetic shield 9 are then fixed to the housing 5 by a bolt 100, which serves as a common fixing part, installed in the fixing holes 80, 70, and 90 of each component (see FIGS. 6 and 7).
• the bolt 100 does not contact the inner wall of the fixing hole 80 in the resolver stator 81, and a predetermined space S is provided in the radial direction X between the bolt 100 and the inner wall of the fixing hole 80.
• the resolver stator 81, low magnetic permeability section 7, and magnetic shield 9 can be fixed at the same time with the common bolt 100, improving the productivity of the rotating electric machine 1 and reducing the production costs of the rotating electric machine 1. Furthermore, if the bolt 100 is magnetic, providing a predetermined space S between the resolver stator 81 and the bolt 100 in the radial direction X can prevent magnetic flux generated from the stator 3 and rotor 4 from flowing from the bolt 100 to the resolver stator 81, preventing a deterioration in the angle detection accuracy of the resolver 8.
• the bolt 100 can be made of a non-magnetic material.
• the resolver stator 81, low magnetic permeability portion 7, and magnetic shield 9 are fixed to the housing 5 using fixing holes 80, 70, and 90 formed in common positions in each component and a common bolt 100, which is a more preferable example in terms of the productivity and production costs of the rotating electric machine 1 and the space efficiency near the fixing portions.
• this is not limited to this.
• the resolver stator 81, low magnetic permeability portion 7, and magnetic shield 9 can be fixed to the housing 5 by overlapping them with a flange of the housing 5 and then using a clamp that can clamp the periphery as a common fixing portion. In this case, the angle detection accuracy of the resolver 8 can be improved, and each component can be fixed at once, which is effective in improving the productivity of the rotating electric machine 1 and reducing the production costs of the rotating electric machine 1.
• the magnetic shield 9 has an extension 91 that extends inward in the radial direction X2 to separate the rotor 4 from the resolver coil 812 in the axial direction Y.
• the extension 91 of the magnetic shield 9 is stepped from the portion of the magnetic shield 9 that contacts the low permeability portion 7 toward the rotor 4 in the axial direction Y to avoid contact with the resolver coil 812.
• a portion T1 of the extension 91 on the inner radial direction X2 is located further inward in the radial direction X than a portion T2 of the inner radial direction X2 of the resolver coil 812 that faces it in the axial direction Y.
• the low permeability portion 7 is formed of a flat plate, and a portion T3 of the low permeability portion 7 on the inner radial direction X2 is located further outward in the radial direction X than a portion T4 of the outer radial direction X1 of the resolver coil 812 of the resolver 8 that faces it in the radial direction X.
• the magnetic shield 9 covers the resolver coil 812 of the resolver stator 81, preventing magnetic flux generated from the stator 3 and rotor 4 from flowing to the resolver coil 812 and preventing a deterioration in the angle detection accuracy of the resolver 8. Furthermore, because the low permeability section 7 is formed from a flat plate, the production costs of the rotating electric machine 1 can be reduced. Furthermore, the low permeability section 7 is a non-magnetic material with magnetic permeability close to that of air, and is formed from a material with higher conductivity than that of the magnetic shield 9. Specifically, aluminum is used.
• the low permeability section 7 can be made of a non-magnetic member made of a non-metallic material such as resin or rubber that does not have high conductivity.
• SUS Step Stainless
• the resolver stator 81 and magnetic shield 9 can be integrally molded using the resin material of the low magnetic permeability portion 7, thereby eliminating the need for a fixing portion. Also, as shown in Figure 8, if the resin material used for the low magnetic permeability portion 7 is, for example, an adhesive or pressure-sensitive adhesive sheet made of a resin material with adhesive properties, the resolver stator 81 and magnetic shield 9 can be adhesively fixed to each other via the resin material of the low magnetic permeability portion 7 with adhesive properties. In this case, the fixing holes and fixing portions described above can be omitted.
• a redundant fixing configuration may be used using fixing portions and fixing holes, etc., from the perspective of preventing peeling and reinforcing the low magnetic permeability portion 7 made of resin material.
• a resin material for the low magnetic permeability portion 7 it is also possible to form the low magnetic permeability portion 7 by coating a predetermined surface of the resolver stator 81 or magnetic shield 9 with a low magnetic permeability resin material. In this case, either the resolver stator 81 or the magnetic shield 9 will be molded integrally with the low magnetic permeability portion 7.
• a common bolt 100 or the like may be used as a separate fixing part to fix the resolver stator 81, magnetic shield 9, and low magnetic permeability portion 7 to one another through fixing holes.
• a resin material is used for the low magnetic permeability portion 7, it is also possible to use, for example, rubber, which is a non-metallic material with low magnetic permeability, such as silicone rubber, which has relatively good heat resistance and a magnetic permeability close to 1, or other heat-resistant rubber such as fluororubber.
• the rotating electric machine 1 to which it is applied has high cooling performance and is designed to keep the temperature near the resolver stator 81 at a relatively low maximum of around 100°C, it is also possible to use synthetic rubber with heat resistance slightly exceeding 100°C as the low magnetic permeability portion 7.
• a shaft a rotor that rotates with the shaft; a stator disposed radially opposite the rotor with a gap therebetween; a housing that holds the shaft via a bearing and that houses the rotor and the stator; a resolver that detects a rotation angle of the rotor, the resolver is disposed between the bearing and the rotor in the axial direction of the shaft,
• the resolver is a resolver rotor disposed on the outer periphery of the shaft and rotating together with the shaft; a resolver stator disposed radially opposite the resolver rotor with a gap therebetween
• the resolver stator includes: a resolver stator core having an annular resolver stator core back portion and a plurality of resolver teeth portions protruding from a radially inner side of the resolver stator core back portion and formed at intervals in a circumferential direction; a plurality of resolver coils wound around each of the resolver teeth
• the resolver stator, the low magnetic permeability portion, and the magnetic shield are fixed to the housing by a common fixing portion, Since the resolver stator, low magnetic permeability portion, and magnetic shield can be fixed at the same time using a common fixing portion, productivity of the rotating electric machine is improved and production costs of the rotating electric machine can be reduced.
• the resolver stator, the low magnetic permeability portion, and the magnetic shield each have a fixing hole formed at the same position in the circumferential direction and the radial direction,
• the fixing portion is installed in each of the fixing holes that communicate with the resolver stator, the low magnetic permeability portion, and the magnetic shield in the axial direction. Since each fixing hole is configured to penetrate in the axial direction, by using each fixing hole, fixing with a common fixing portion becomes easy.
• the fixing portion is formed by a bolt,
• the resolver stator, low magnetic permeability portion, and magnetic shield can be easily fixed at once using a common bolt, reducing the production cost of the rotating electrical machine.
• the fixing portion is not in contact with the inner wall of the fixing hole of the resolver stator, and is installed with a predetermined space between the fixing portion and the inner wall of the fixing hole.
• the fixed portion is made of a magnetic material, by providing a predetermined space between the resolver stator and the fixed portion, it is possible to prevent magnetic flux generated from the stator and rotor from flowing from the fixed portion to the resolver stator, thereby preventing a deterioration in the angle detection accuracy of the resolver.
• the fixed portion is made of a non-magnetic material.
• a non-magnetic material for the fixed portion, magnetic flux generated by the stator and rotor and flowing through the magnetic shield can be prevented from flowing from the fixed portion to the resolver stator, preventing deterioration in the angle detection accuracy of the resolver.
• the magnetic shield has an extending portion extending radially inward to shield the rotor from the resolver coil in the axial direction.
• the low permeability portion is formed of a flat plate, The production cost of the low permeability portion can be reduced.
• the low magnetic permeability portion is formed of a material having a higher conductivity than the magnetic shield.
• Fig. 9 is an axial cross-sectional view showing the configuration of a rotating electric machine according to embodiment 2.
• Fig. 10 is a plan view showing the configuration of a low magnetic permeability portion as viewed from the rotor side of the rotating electric machine shown in Fig. 9.
• Fig. 11 is a plan view showing the configuration in which a resolver stator, a low magnetic permeability portion, and a magnetic shield are superimposed as viewed from the rotor side of the rotating electric machine shown in Fig. 9.
• parts that are the same as those in embodiment 1 above are given the same reference numerals, and description thereof will be omitted.
• the low permeability portion 77 is sandwiched between the resolver stator 81 and the magnetic shield 9 in the axial direction Y, as in the first embodiment.
• the low permeability portion 77 is made of a material having a magnetic permeability lower than that of the magnetic shield 9.
• a plurality of low permeability portions 77 are installed at separate locations in the circumferential direction Z (here, three locations).
• Each low permeability portion 77 is formed as a hollow cylinder having a fixing hole 70.
• the outer shape of the low permeability portion 7 of the first embodiment is indicated by a dotted line to compare the low permeability portions 77 of the second embodiment with the low permeability portion 7 of the first embodiment.
• the low permeability portions 77 are arranged locally, so that, as shown in FIG. 9, between the resolver stator 81 and the magnetic shield 9, there are both areas where the low permeability portions 77 are arranged and areas where no low permeability portions 77 are actually arranged and an air layer 777 with low magnetic permeability is formed.
• the rest of the configuration is the same as in the first embodiment above.
• the low permeability portions 77 function as spacers to create a gap in the axial direction Y between the resolver stator 81 and the magnetic shield 9, ensuring both an area with a low permeability air layer 777 and an area with the low permeability portions 77. This further improves the shielding of the magnetic flux generated by the stator 3 and rotor 4 to the resolver 8. Furthermore, by locally arranging the low permeability portions 77, it is possible to reduce the weight of the low permeability portions 77 and reduce production costs.
• the low-permeability portion 77 when using a configuration that ensures both an area through the low-permeability air layer 777 and an area through the low-permeability portion 77, particularly when the low-permeability portion 77 is made of a material with a higher permeability than the air layer 777, it is desirable to set the area ratio of the area through the air layer 777 to the area through the low-permeability portion 77 in the area sandwiched between the resolver stator 81 and the magnetic shield 9 so that the area ratio of the area through the air layer 777 is higher than that of the area through the low-permeability portion 77. This makes it possible to further improve the shielding of magnetic flux generated from the stator 3 and rotor 4 to the resolver 8 within the constraints on the permeability of the material that can be used for the low-permeability portion 77.
• the resolver stator 81 and magnetic shield 9 may be integrally molded using the resin, and an adhesive or pressure-sensitive adhesive sheet with adhesive properties may be used. Furthermore, bolts 100 are used as fixing portions for fixing the resolver stator 81, low magnetic permeability portion 77, and magnetic shield 9, and are made of a non-magnetic material. Using a non-magnetic material for the fixing portions in this way prevents the magnetic flux generated by the stator 3 and rotor 4, which flows through the magnetic shield 9, from flowing from the fixing portion to the resolver stator 81, preventing a deterioration in the angle detection accuracy of the resolver 8.
• a fixing hole 70 is formed in the low magnetic permeability portion 77, and fixing holes 80, 90 formed in the resolver stator 81 and magnetic shield 9 are aligned with this fixing hole 70, and they are firmly fixed to each other using a bolt 100 that serves as a common fixing part.
• the fixing hole 70 formed in the low magnetic permeability portion 77 may be omitted.
• the low-permeability portions 77 are arranged in three or more locations in the circumferential direction Z in an annular region sandwiched between the resolver stator 81 and the magnetic shield 9.
• the axial distance Y of the air layer 777 formed between the resolver stator 81 and the magnetic shield 9, i.e., the axial distance Y between the resolver stator 81 and the magnetic shield 9 can be set to a predetermined distance.
• the low-permeability portion 77 that omits the fixing hole 70 is arranged in a position that does not block the fixing holes 80, 90 formed in the resolver stator 81 and the magnetic shield 9 in the axial direction Y.
• low-permeability portions 77 are arranged at three locations in the circumferential direction Z as spacers to uniformly space the air layer 777 in the axial direction Y.
• this is not limited to this.
• a suitable configuration would be to arrange an annular, flat-plate-shaped low-permeability portion concentrically in the area facing the resolver stator 81 and magnetic shield 9 in the axial direction Y.
• a fixing hole may be formed and the resolver stator 81 and magnetic shield 9 may be firmly fixed to each other using a bolt 100 that serves as a common fixing portion.
• the fixing hole may be omitted and the resolver stator 81 and magnetic shield 9 may be sandwiched between them, and annular low-permeability portions may be formed and arranged in concentric positions offset to the inner side X2 or outer side X1 in the radial direction X between the fixing holes 80, 90 formed in the resolver stator 81 and magnetic shield 9.
• the rotating electric machine of the second embodiment configured as described above has the same effects as those of the first embodiment, and also has the following advantages: the low permeability portion is disposed between the resolver stator and the magnetic shield in the axial direction, and is spaced apart from one another at multiple locations in the circumferential direction; In the radial direction between the resolver stator and the magnetic shield in the axial direction, an air layer where the low magnetic permeability portion is not provided is formed. This allows for both areas with low magnetic permeability air gaps and areas with low magnetic permeability sections, further improving the ability to block magnetic flux generated from the stator and rotor to the resolver. Furthermore, by locally arranging the low permeability sections, it is possible to reduce the weight and production costs of the low permeability sections.
• Fig. 12 is an axial cross-sectional view of a portion of the configuration of a rotating electric machine according to embodiment 3.
• Fig. 13 is a plan view of a state in which a resolver stator, a low magnetic permeability portion, and a magnetic shield are fixed, as viewed from the rotor side according to embodiment 3.
• parts that are the same as those in the above embodiments are given the same reference numerals, and description thereof will be omitted.
• the shaft 2 has a flange portion 200 with a locally increased diameter formed at a position facing the magnetic shield 9 in the radial direction X.
• the low magnetic permeability portion 7 is made of a material such as aluminum whose magnetic permeability is equivalent to that of air.
• the distance in the radial direction X from the inner side X2 of the magnetic shield 9 in the radial direction X to the flange portion 200 of the shaft 2 is defined as distance W1.
• the radial X distance of the gap G2 between the resolver stator 81 and the resolver rotor 82 is defined as distance W2 (i.e., the radial X distance from the outer radial X portion X1 of the resolver rotor 82 to the inner radial X portion X2 of the resolver stator 81).
• the axial Y thickness of the low magnetic permeability section 7 is defined as thickness W3 (i.e., the shortest distance between the points where the resolver stator core 811 and the magnetic shield 9 face each other in the axial Y).
• each component is formed so that "W1 ⁇ W2 + W3" is satisfied, and therefore the magnetic resistance between the magnetic shield 9 and shaft 2 is smaller than the sum of the magnetic resistance of the gap G2 between the resolver rotor 82 and resolver stator 81 and the magnetic resistance between the resolver stator 81 and magnetic shield 9. Therefore, the magnetic flux generated from the stator 3 and rotor 4 flowing through the shaft 2 of the rotating electric machine 1 to the resolver 8 is more likely to flow from shaft 2 to magnetic shield 9 than from shaft 2 to resolver rotor 82 to resolver stator 81 to magnetic shield 9. This further prevents the magnetic flux generated from the stator 3 and rotor 4 from flowing into the resolver 8. This prevents a deterioration in the angle detection accuracy of the resolver 8.
• a ring-shaped magnetic material such as iron may be fixed to the corresponding portion of the shaft 2 by press-fitting or the like to form a protrusion.
• the cylindrical portion 901 of the magnetic shield 9 further prevents magnetic flux generated by the stator 3 and rotor 4 from flowing from the outside X1 in the radial direction X of the resolver stator 81, thereby further improving the angle detection accuracy of the resolver 8.
• the plate thickness W4 of the magnetic shield 9 is formed so that it is equal to or less than the saturation magnetic flux density of the material of the magnetic shield 9. This keeps the magnetic flux density of the magnetic shield 9 below the saturation magnetic flux density, preventing magnetic flux generated by the stator 3 and rotor 4 flowing through the magnetic shield 9 from leaking and flowing into the resolver stator 81, and preventing a deterioration in the angle detection accuracy of the resolver 8.
• the rotating electric machine of the fourth embodiment configured as described above has the same effects as the above-described embodiments, and also has the following advantages:
• the magnetic shield includes a cylindrical portion formed such that the radially outer side of the magnetic shield extends in the axial direction so as to cover the radially outer side of the resolver stator.
• the cylindrical portion can prevent magnetic flux generated by the stator and rotor from flowing in from the radial outside of the resolver stator, and further improves the angle detection accuracy of the resolver.
• Rotating electric machine 100. Bolt, 2. Shaft, 200. Flange portion, 3. Stator, 31. Stator core, 32. Coil, 4. Rotor, 41. Rotor core, 42. Permanent magnet, 5. Housing, 51. Protrusion, 500. Positioning pin, 6. Bearing, 7. Low magnetic permeability portion, 77. Low magnetic permeability portion, 70. Fixing hole, 700. Positioning hole, 777. Air layer, 8. Resolver, 80. Fixing hole, 800. Recess, 801.
• Resolver stay Octagonal core back section 802 resolver teeth section, 81 resolver stator, 811 resolver stator core, 812 resolver coil, 82 resolver rotor, 9 magnetic shield, 90 fixing hole, 900 positioning hole, 901 cylindrical section, 91 extension section, G1 gap, G2 gap, Q central axis, X radial direction, X1 outer side, X2 inner side, Y axial direction, Z circumferential direction, W1 distance, W2 distance, W3 thickness, W4 plate thickness.

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  • 2024-02-07 JP JP2025575148A patent/JPWO2025169331A1/ja active Pending
  • 2024-02-07 WO PCT/JP2024/004057 patent/WO2025169331A1/ja active Pending

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