Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/22—Rotating parts of the magnetic circuit
  • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
  • H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/22—Rotating parts of the magnetic circuit
  • H02K1/27—Rotor cores with permanent magnets
  • H02K1/2706—Inner rotors
  • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
  • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
  • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
  • H02K1/278—Surface mounted magnets; Inset magnets
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/22—Rotating parts of the magnetic circuit
  • H02K1/27—Rotor cores with permanent magnets
  • H02K1/2786—Outer rotors
  • H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
  • H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
  • H02K1/2791—Surface mounted magnets; Inset magnets
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
  • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
  • H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos

Definitions

• This disclosure relates to a motor.
• JP 2021-020633 A discloses a motor that includes a shaft, a stator arranged coaxially with the shaft, a rotor yoke arranged around the stator, and a support member that supports the rotor yoke on the shaft.
• the support member has an opposing portion that faces the rotor yoke in the radial direction of the rotor yoke.
• the present disclosure has been made in consideration of the above problems, and aims to provide, as an example, a motor that can suppress distortion of the adhesive while simultaneously reducing the weight of the support member and ensuring the rigidity of the support member.
• a motor comprising a shaft, a stator arranged coaxially with the shaft, a rotor yoke arranged around the stator, and a support member that supports the rotor yoke on the shaft, the support member having an opposing portion that faces the rotor yoke in the radial direction of the rotor yoke, and a groove that contains an adhesive that bonds the opposing portion and the opposing surface is formed on the opposing surface of the rotor yoke that faces the opposing portion.
• a motor that can suppress distortion of the adhesive while simultaneously reducing the weight of the support member and ensuring the rigidity of the support member.
• FIG. 1 is a vertical cross-sectional view of a motor according to a first embodiment.
• FIG. FIG. 2 is a perspective view of a support member according to the first embodiment.
• FIG. 2 is a perspective view of the rotor yoke according to the first embodiment.
• 2 is a perspective view showing a state in which a plurality of rotor magnets are provided on the inner peripheral surface of the rotor yoke according to the first embodiment.
• FIG. 5 is an explanatory diagram illustrating the positional relationship between the opposing portions of the support member, grooves in the rotor yoke, and multiple rotor magnets according to the first embodiment.
• FIG. FIG. 2 is an enlarged view showing a portion of the rotor yoke according to the first embodiment.
• FIG. 2 is a schematic cross-sectional view showing a part of a rotor according to the first embodiment with dimensions of each part exaggerated.
• FIG. FIG. 11 is a perspective view of a rotor yoke according to a second embodiment. This is a cross-sectional view taken along line F9-F9 in Figure 8. This is a cross-sectional view taken along line F10-F10 in Figure 8.
• 13 is a plan view showing a state in which a plurality of rotor magnets are provided on the inner peripheral surface of a rotor yoke according to a second embodiment.
• FIG. 13 is an explanatory diagram illustrating the positional relationship between the opposing portions of the support member, the grooves of the rotor yoke, and multiple rotor magnets according to the second embodiment.
• FIG. 13A and 13B are diagrams illustrating modified examples of a plurality of contact portions according to the second embodiment.
• FIG. 11 is a perspective view of a rotor yoke according to a third embodiment.
• 13 is a plan view showing a state in which a plurality of rotor magnets are provided on the inner peripheral surface of a rotor yoke according to a third embodiment.
• FIG. 13 is an explanatory diagram illustrating the positional relationship between the opposing portions of the support member, the grooves of the rotor yoke, and multiple rotor magnets according to the third embodiment.
• FIG. FIG. 11 is a schematic cross-sectional view showing a part of a rotor according to a fourth embodiment with dimensions of each part exaggerated.
• 13 is an explanatory diagram illustrating the positional relationship between the opposing portions of the support member, the grooves of the rotor yoke, and multiple rotor magnets according to the fourth embodiment.
• FIG. FIG. 13 is a diagram showing a modified example of the rotor according to the fourth embodiment.
• FIG. 13 is a perspective view of a rotor yoke according to a fifth embodiment.
• FIG. 13 is a schematic cross-sectional view showing a part of a rotor according to a fifth embodiment with dimensions of each part exaggerated.
• 13 is a plan view showing a state in which a plurality of rotor magnets are provided on the inner peripheral surface of a rotor yoke according to a fifth embodiment.
• FIG. 13 is an explanatory diagram illustrating the positional relationship between the contact portion, the groove of the rotor yoke, and multiple rotor magnets according to the fifth embodiment.
• FIG. FIG. 13 is a perspective view of a rotor yoke according to a sixth embodiment.
• FIG. 13 is a perspective view of a rotor yoke according to a seventh embodiment.
• FIG. 13 is a schematic cross-sectional view showing a part of a rotor according to an eighth embodiment with dimensions of each part exaggerated.
• FIG. 13 is an explanatory diagram illustrating the positional relationship between the opposing portions of the support member, the grooves of the rotor yoke, and multiple rotor magnets according to the 9th embodiment.
• FIG. 13A and 13B are diagrams showing modified examples of grooves according to the ninth embodiment.
• FIG. 4 is a schematic cross-sectional view showing a rotor according to a comparative example with exaggerated dimensions of each part.
• FIG. 1 is a vertical cross-sectional view of a motor 10 according to the first embodiment.
• the motor 10 is an outer rotor type brushless motor, and includes a stator 22, a rotor 24, a base member 26, a first ball bearing 28, a second ball bearing 30, and a shaft 32.
• the arrow A1 indicates one axial side of the motor 10, and the arrow A2 indicates the other axial side of the motor 10.
• the stator 22, rotor 24, and base member 26 constitute the motor body 34.
• the stator 22 is annular and is arranged coaxially (concentrically) with the shaft 32.
• the stator 22 has a stator core 36 and a plurality of winding winding portions 38.
• the stator core 36 has an annular portion 40 and a plurality of teeth portions 42 extending radially around the annular portion 40. Insulators (not shown) are attached to the plurality of teeth portions 42. A winding is wound around each tooth portion 42 via the insulator, thereby forming a winding winding portion 38 on each tooth portion 42.
• the rotor 24 has a support member 44, a rotor yoke 46, and multiple rotor magnets 48.
• the rotor yoke 46 is made of a material with a lower thermal expansion coefficient than the support member 44.
• the support member 44 is made of resin
• the rotor yoke 46 is made of iron.
• the support member 44 is disposed on one axial side of the stator 22 facing the stator 22.
• a through hole 52 that penetrates the support member 44 in the axial direction is formed in the center of the support member 44, and the shaft 32 is inserted into the through hole 52.
• a protruding portion 54 that protrudes to one axial side of the support member 44 is formed in the center of the support member 44, and a plurality of screw holes 56 that extend radially of the support member 44 are formed in the protruding portion 54.
• the multiple screw holes 56 are connected to the through hole 52.
• Set screws 58 (set screws) are screwed into each of the multiple screw holes 56.
• the tip of each set screw 58 is fitted into each of the multiple recesses 60 formed in the shaft 32, thereby fixing the rotor 24 to the shaft 32.
• the rotor yoke 46 (back yoke) is formed in an annular shape and is provided around the stator 22.
• the rotor yoke 46 is fixed to the outer periphery of the support member 44 and is supported relative to the shaft 32 by the support member 44.
• the support member 44 and the rotor yoke 46 form a rotor housing 64 that is cylindrical with a bottom (cylindrical with a top).
• the stator 22 is rotatably housed inside the rotor housing 64.
• a number of rotor magnets 48 are provided on the inner peripheral surface 90 of the rotor yoke 46.
• the rotor magnets 48 are arranged in a line in the circumferential direction of the rotor yoke 46.
• Each rotor magnet 48 faces the stator 22 (teeth portion 42) in the radial direction of the motor 10.
• Adjacent rotor magnets 48 are arranged so that their different magnetic poles are adjacent to each other.
• the base member 26 (center piece) has a disk portion 68 and a bearing accommodating portion 70.
• the disk portion 68 is disposed opposite the stator 22 on the other axial side of the stator 22.
• the bearing accommodating portion 70 protrudes from the disk portion 68 toward the stator 22.
• the bearing accommodating portion 70 is fitted (press-fitted) into the inside of the annular portion 40 formed in the stator core 36, whereby the stator 22 is supported by the bearing accommodating portion 70.
• the bearing accommodating portion 70 is formed in a cylindrical shape and opens on both axial sides of the base member 26.
• the first ball bearing 28 and the second ball bearing 30 are accommodated inside the bearing accommodating portion 70 with a gap in the axial direction of the bearing accommodating portion 70.
• the shaft 32 is inserted inside the first ball bearing 28 and the second ball bearing 30, and the shaft 32 is rotatably supported by the first ball bearing 28 and the second ball bearing 30.
• FIG. 2 is a perspective view of the support member 44 according to the first embodiment.
• the support member 44 has a plurality of cutouts 50 that penetrate the support member 44 in the axial direction and are formed at equal intervals around the circumference of the support member 44.
• the support member 44 has a plurality of spokes 72.
• the plurality of spokes 72 extend radially from the center of the support member 44.
• the outer periphery of the support member 44 is supported by a plurality of spokes 72 relative to the center of the support member 44.
• the outer periphery of the support member 44 has an opposing portion 80, a stopper portion 82, and a plurality of positioning portions 84.
• the opposing portion 80 is formed in an annular shape along the circumferential direction of the support member 44.
• the stopper portion 82 is located on one axial side of the support member 44 relative to the opposing portion 80.
• the stopper portion 82 protrudes radially outward from the support member 44 relative to the opposing portion 80.
• the stopper portion 82 is formed in an annular shape along the circumferential direction of the support member 44.
• a plurality of positioning recesses 86 are formed in the stopper portion 82. Each positioning recess 86 is formed in a concave shape that opens radially outward from the support member 44. Each positioning recess 86 penetrates the support member 44 in the axial direction.
• the multiple positioning portions 84 are aligned in the circumferential direction of the support member 44. Each positioning portion 84 extends from the opposing portion 80 to the other axial side of the support member 44. Each positioning portion 84 is disposed between adjacent rotor magnets 48 (see FIG. 1) and positions each rotor magnet 48.
• FIG 3 is a perspective view of the rotor yoke 46 according to the first embodiment.
• a number of positioning protrusions 88 are formed on one axial end of the rotor yoke 46. Each positioning protrusion 88 protrudes from one axial side of the rotor yoke 46. Each positioning protrusion 88 engages with a positioning recess 86 (see Figure 2), thereby positioning the rotor yoke 46 in the circumferential direction of the support member 44.
• An inner peripheral surface 90 of the rotor yoke 46 is formed with a fixing surface 90A to which a number of rotor magnets 48 (see Figure 1) are fixed.
• a groove 92 is formed on the inner peripheral surface 90 of the rotor yoke 46.
• the groove 92 is located on one axial side of the rotor yoke 46 relative to the fixing surface 90A.
• the fixing surface 90A and the groove 92 are formed in an annular shape along the circumferential direction of the rotor yoke 46.
• the groove 92 may be formed by cutting or the like when the rotor yoke 46 is formed in an annular shape.
• a plate-shaped member having the groove 92 may be formed by pressing, and then the plate-shaped member may be processed into an annular shape to form the rotor yoke 46.
• FIG. 4 is a perspective view showing a state in which multiple rotor magnets 48 are provided on the inner peripheral surface 90 of the rotor yoke 46 according to the first embodiment.
• Multiple rotor magnets 48 are fixed to the fixing surface 90A of the rotor magnet 48.
• Adjacent rotor magnets 48 are arranged at intervals in the circumferential direction of the rotor yoke 46.
• the groove 92 is located on one axial side of the rotor yoke 46 relative to the fixing surface 90A.
• the groove 92 is located on one axial side of the rotor yoke 46 relative to the multiple rotor magnets 48.
• FIG. 5 is an explanatory diagram illustrating the positional relationship between the opposing portion 80 of the support member 44, the groove 92 of the rotor yoke 46, and the multiple rotor magnets 48 according to the first embodiment.
• the opposing portion 80, the rotor yoke 46, and the multiple rotor magnets 48 are shown in a planar expanded state.
• the groove 92 is within a range L of the length of the opposing portion 80 in the axial direction of the support member 44.
• the opposing portion 80 is located on one axial side of the rotor yoke 46 relative to the multiple rotor magnets 48.
• FIG. 6 is an enlarged view of a portion of the rotor yoke 46 according to the first embodiment.
• An abutment portion 94 is formed on the inner peripheral surface 90 of the rotor yoke 46.
• the abutment portion 94 has a first abutment portion 94A and a second abutment portion 94B.
• the first abutment portion 94A and the second abutment portion 94B are adjacent to both sides of the groove 92 in the axial direction of the rotor yoke 46.
• first abutment portion 94A is formed at a position on one axial side of the rotor yoke 46 relative to the groove 92
• second abutment portion 94B is formed at a position on the other axial side of the rotor yoke 46 relative to the groove 92.
• the first abutment portion 94A and the second abutment portion 94B are formed in an annular shape along the circumferential direction of the rotor yoke 46.
• FIG. 7 is a schematic cross-sectional view showing the dimensions of each part of a part 24A of the rotor 24 according to the first embodiment with exaggerated dimensions.
• An adhesive 96 is applied to the inner peripheral surface 90 of the rotor yoke 46.
• the inner peripheral surface 90 of the rotor yoke 46 is bonded to the opposing part 80 of the support member 44 by the adhesive 96.
• the opposing part 80 is located radially inside the rotor yoke 46 and faces the inner peripheral surface 90 of the rotor yoke 46 in the radial direction of the rotor yoke 46.
• the inner peripheral surface 90 is an example of an opposing surface in the present disclosure.
• a part of the adhesive 96 is accommodated in the groove 92.
• the amount of adhesive 96 can be increased compared to when the groove 92 is omitted, for example, so that the adhesive strength between the opposing part 80 and the inner peripheral surface 90 can be improved.
• the stopper portion 82 positions the rotor yoke 46 in the axial direction of the support member 44 by contacting the rotor yoke 46 from one axial side of the support member 44. In addition, the stopper portion 82 contacts the rotor yoke 46, thereby preventing the rotor yoke 46 from tilting (falling over) relative to the opposing portion 80 when an external disturbance acts on the rotor yoke 46 or when the rotor yoke 46 is assembled to the support member 44.
• the stopper portion 82 may be spaced apart from the rotor yoke 46 in the axial direction of the support member 44.
• the adhesive 96 also permeates both sides of the groove 92 in the axial direction of the rotor yoke 46, and the first abutment portion 94A and the second abutment portion 94B are adhered to the opposing portion 80 via the adhesive 96.
• the first abutment portion 94A and the second abutment portion 94B abut against the opposing portion 80 via the adhesive 96 in the radial direction of the rotor yoke 46.
• the first abutment portion 94A and the second abutment portion 94B may abut directly against the opposing portion 80 without the adhesive 96.
• the rotor yoke 46 may be fitted into the opposing portion 80 at the first abutment portion 94A and the second abutment portion 94B.
• the adhesive 96 also permeates the fixing surface 90A, and each rotor magnet 48 is fixed to the fixing surface 90A with the adhesive 96.
• the groove 92 is located at one axial side of the rotor yoke 46 relative to the rotor magnet 48.
• the facing portion 80 abuts against each rotor magnet 48 from one axial side of the rotor yoke 46. Note that the facing portion 80 may be spaced apart from each rotor magnet 48 in the axial direction of the rotor yoke 46.
• FIG. 29 is a schematic cross-sectional view showing an exaggerated dimension of each part of a rotor according to the comparative example.
• the groove 92 is formed on the outer peripheral surface of the facing part 80, not on the inner peripheral surface 90 of the rotor yoke 46.
• the rigidity of the facing part 80 and therefore the rigidity of the support member 44 are reduced.
• the support member 44 is made of resin and the rotor yoke 46 is made of iron, the support member 44 has a higher thermal expansion coefficient than the rotor yoke 46. Therefore, for example, when the groove 92 is formed on the outer peripheral surface of the facing part 80, there is a risk that the distortion of the adhesive 96 contained in the groove 92 will increase in an environment with large temperature changes.
• the grooves 92 are formed on the inner circumferential surface 90 of the rotor yoke 46, and not on the opposing portion 80. This ensures the rigidity of the opposing portion 80, and therefore the rigidity of the support member 44, compared to the comparative example in which the grooves 92 are formed on the opposing portion 80. In other words, even when the weight of the support member 44 is reduced by removing material from the portions between the multiple spokes 72 (see FIG. 2), the rigidity of the support member 44 can be ensured. This makes it possible to achieve both a reduction in weight of the support member 44 and an ensured rigidity of the support member 44.
• the groove 92 is formed in the rotor yoke 46, which has a lower thermal expansion coefficient than the support member 44. Therefore, even in an environment with large temperature changes, distortion of the adhesive 96 contained in the groove 92 can be suppressed compared to the comparative example.
• the groove 92 is formed at a position offset in the axial direction of the rotor yoke 46 with respect to the rotor magnet 48. Therefore, compared to a case where the groove 92 is formed at a position overlapping with the rotor magnet 48, for example, it is possible to suppress a reduction in the thickness of the magnetic circuit portion of the rotor yoke 46. This makes it possible to ensure the magnetic characteristics of the motor 10 and the support rigidity of the rotor magnet 48 with respect to the rotor yoke 46.
• the groove 92 is also formed in a ring shape along the circumferential direction of the rotor yoke 46. This allows the center of gravity of the rotor yoke 46 to be aligned with the center of the rotational axis of the rotor yoke 46. This ensures the rotational balance of the rotor 24. Furthermore, by forming the groove 92 in a ring shape, the ease of machining the groove 92 can be ensured.
• the groove 92 is also within the length range L of the opposing portion 80 in the axial direction of the support member 44. Therefore, compared to a case where the groove 92 is formed beyond the length range L of the opposing portion 80, for example, an appropriate amount of adhesive 96 can ensure the adhesive strength of the rotor yoke 46 to the support member 44.
• an abutment portion 94 is formed on the inner peripheral surface 90 of the rotor yoke 46, which abuts against the opposing portion 80 in the radial direction of the rotor yoke 46. Therefore, for example, when an external disturbance acts on the rotor yoke 46, or when the rotor yoke 46 is assembled to the support member 44, the rotor yoke 46 can be prevented from tilting (falling over) relative to the opposing portion 80. This allows the center of gravity of the rotor yoke 46 to be aligned with the center of the rotation axis of the rotor yoke 46, ensuring the rotational balance of the rotor 24.
• the abutment portion 94 also has a first abutment portion 94A formed at a position on one axial side of the rotor yoke 46 relative to the groove 92, and a second abutment portion 94B formed at a position on the other axial side of the rotor yoke 46 relative to the groove 92. Therefore, compared to a case where the abutment portion 94 has only one of the first abutment portion 94A and the second abutment portion 94B, for example, the rotor yoke 46 can be more effectively prevented from tilting (falling over) relative to the opposing portion 80.
• the abutment portion 94 is formed at a position offset from the groove 92 in the axial direction of the rotor yoke 46. Therefore, the cross-sectional shape of the groove 92 can be made constant around the circumference of the groove 92. This ensures the ease of machining the groove 92.
• the abutment portion 94 is formed at a position offset in the axial direction of the rotor yoke 46 relative to the rotor magnet 48. Therefore, the abutment portion 94 can be brought into abutment with the opposing portion 80 while preventing interference between the abutment portion 94 and the rotor magnet 48.
• the abutment portion 94 is also formed in an annular shape along the circumferential direction of the rotor yoke 46. This allows the center of gravity of the rotor yoke 46 to be aligned with the center of the rotational axis of the rotor yoke 46. This ensures the rotational balance of the rotor 24. Furthermore, by forming the abutment portion 94 in an annular shape, the workability of the groove 92 can be ensured.
• the opposing portion 80 is located radially inward of the rotor yoke 46. This prevents the support member 44 from expanding radially. This allows the motor 10 to be made smaller in the radial direction.
• FIG. 8 is a perspective view of the rotor yoke 46 according to the second embodiment.
• a plurality of first abutment portions 94A are formed on the inner peripheral surface 90 of the rotor yoke 46 according to the second embodiment.
• the plurality of first abutment portions 94A are formed to have the same shape as one another.
• the plurality of first abutment portions 94A are formed in a line at equal intervals in the circumferential direction of the rotor yoke 46.
• the plurality of first abutment portions 94A are an example of the plurality of abutment portions in this disclosure.
• the second abutment portion 94B is formed in an annular shape along the circumferential direction of the rotor yoke 46.
• FIG. 9 is a cross-sectional view taken along line F9-F9 in FIG. 8 (cross-sectional view at the position of the first contact portion 94A)
• FIG. 10 is a cross-sectional view taken along line F10-F10 in FIG. 8 (cross-sectional view at a position shifted from the first contact portion 94A).
• FIG. 9 and FIG. 10 are schematic cross-sectional views showing the dimensions of each portion in FIG. 8 in an exaggerated manner.
• each first contact portion 94A is formed at a position that falls within the width range W1 of the groove 92.
• each contact portion 94 is formed at an end portion on one side of the width direction of the groove 92 (an end portion of the groove 92 located on one axial side of the rotor yoke 46).
• the groove 92 is open to an end portion on one axial side of the rotor yoke 46 between adjacent first contact portions 94A (see FIG. 10). That is, the groove 92 has an opening portion 92A that opens to one axial side of the rotor yoke 46 between adjacent contact portions 94.
• FIG. 11 is a plan view showing a state in which multiple rotor magnets 48 are provided on the inner peripheral surface 90 of a rotor yoke 46 according to the second embodiment.
• Each first abutment portion 94A is formed in an arc shape along the circumferential direction of the rotor yoke 46 in a plan view.
• FIG. 12 is an explanatory diagram for explaining the positional relationship between the opposing portion 80 of the support member 44, the groove 92 of the rotor yoke 46, and the multiple rotor magnets 48 according to the second embodiment.
• the opposing portion 80, the rotor yoke 46, and the multiple rotor magnets 48 are shown in a planarly developed state.
• Each first abutment portion 94A is within a range L of the length of the opposing portion 80 in the axial direction of the support member 44.
• each first abutment portion 94A is formed across a range R between adjacent rotor magnets 48.
• the number of first abutment portions 94A is the same as the number of rotor magnets 48, and each first abutment portion 94A is formed corresponding to each range R.
• a magnetic flux path M is formed along which magnetic flux passes from one of the adjacent rotor magnets 48 to the other.
• Each first abutment portion 94A is located on the magnetic flux path M.
• first abutment portions 94A are formed in a line in the circumferential direction of the rotor yoke 46. Therefore, the spaces between adjacent first abutment portions 94A are hollowed out, making it possible to reduce weight compared to, for example, a case in which the first abutment portions 94A are formed in an annular shape in the circumferential direction of the rotor yoke 46.
• each first abutment portion 94A is formed across the range R between adjacent rotor magnets 48. Therefore, the loss of rigidity between the rotor magnets 48 can be compensated for by the first abutment portion 94A. This ensures the rigidity of the rotor yoke 46.
• the first contact portions 94A are formed in the same shape and are arranged at equal intervals in the circumferential direction of the rotor yoke 46. This allows the center of gravity of the rotor yoke 46 to be aligned with the center of the rotation axis of the rotor yoke 46. This ensures the rotational balance of the rotor 24.
• each first abutment portion 94A is located on the magnetic flux path M of the adjacent rotor magnet 48. Therefore, the thick portion of each first abutment portion 94A forms part of the magnetic flux path M, and therefore the magnetic characteristics of the motor 10 can be improved compared to, for example, a case in which each first abutment portion 94A is off the magnetic flux path M.
• the groove 92 is also open to one axial end of the rotor yoke 46 between adjacent first abutment portions 94A. This ensures a sufficient width for the groove 92 between adjacent first abutment portions 94A. This allows the amount of adhesive 96 to be increased between adjacent first abutment portions 94A, for example, compared to when the groove 92 is closed to one axial end of the rotor yoke 46 between adjacent first abutment portions 94A, thereby improving the adhesive strength between the opposing portion 80 and the inner circumferential surface 90.
• FIG. 13 is a diagram showing a modified example of the multiple abutment portions 94 according to the second embodiment.
• each abutment portion 94 is formed across multiple ranges R (as an example, two ranges R). Even with this configuration, it is possible to obtain the same effect as the configuration shown in FIG. 12.
• FIG. 14 is a perspective view of a rotor yoke 46 according to the third embodiment.
• a plurality of grooves 92 are formed on an inner peripheral surface 90 of the rotor yoke 46 according to the third embodiment.
• the plurality of grooves 92 are formed to have the same shape as one another.
• the plurality of grooves 92 are formed in a line at equal intervals in the circumferential direction of the rotor yoke 46.
• Each groove 92 is formed with the circumferential direction of the rotor yoke 46 as its longitudinal direction. There may be any number of grooves 92.
• FIG. 15 is a plan view showing a state in which multiple rotor magnets 48 are provided on the inner peripheral surface 90 of a rotor yoke 46 according to the third embodiment.
• Each groove 92 falls within the width range W2 of each rotor magnet 48 in the circumferential direction of the rotor yoke 46.
• FIG. 16 is an explanatory diagram illustrating the positional relationship between the opposing portion 80 of the support member 44, the groove 92 of the rotor yoke 46, and the multiple rotor magnets 48 according to the third embodiment.
• the opposing portion 80, the rotor yoke 46, and the multiple rotor magnets 48 are shown in a planar expanded state.
• Each groove 92 is open at one end on one axial side of the rotor yoke 46. That is, each groove 92 has an opening 92A that opens to one axial side of the rotor yoke 46. The end of each groove 92 on the other axial side of the rotor yoke 46 is closed.
• a magnetic flux path M between adjacent rotor magnets 48 is formed in the rotor yoke 46.
• the area A between adjacent grooves 92 on the inner circumferential surface 90 is located on the magnetic flux path M between adjacent rotor magnets 48.
• the area A between each adjacent groove 92 is formed as an abutment portion 94.
• multiple grooves 92 are formed in a line in the circumferential direction of the rotor yoke 46. Therefore, the thickness of the rotor yoke 46 can be ensured between adjacent grooves 92. This improves the rigidity of the rotor yoke 46 compared to, for example, a case in which the grooves 92 are formed in an annular shape in the circumferential direction of the rotor yoke 46.
• the grooves 92 are formed in the same shape and are arranged at equal intervals around the circumference of the rotor yoke 46. This allows the center of gravity of the rotor yoke 46 to be aligned with the center of the rotational axis of the rotor yoke 46. This ensures the rotational balance of the rotor 24.
• each groove 92 falls within the width range W2 of each rotor magnet 48 in the circumferential direction of the rotor yoke 46. Therefore, the loss of rigidity caused by the formation of the grooves 92 can be compensated for by the rotor magnet 48. This ensures the rigidity of the rotor yoke 46.
• the area A between adjacent grooves 92 on the inner circumferential surface 90 is located on the magnetic flux path M of adjacent rotor magnets 48. Therefore, the portion where the thickness is ensured by the area A between adjacent grooves 92 forms part of the magnetic flux path M, so that the magnetic characteristics of the motor 10 can be improved compared to, for example, a case where only the thin-walled portion resulting from the formation of the grooves 92 is located on the magnetic flux path M.
• the area A between each adjacent groove 92 is formed as an abutment portion 94. Therefore, for example, compared to when the groove 92 is formed in an annular shape along the circumferential direction of the rotor yoke 46, the area where the abutment portion 94 and the facing portion 80 abut can be enlarged. This improves the support rigidity of the rotor yoke 46 against the facing portion 80.
• the abutment portion 94 functions as a rigid portion between each adjacent groove 92, the rigidity of the rotor yoke 46 can be improved compared to when the groove 92 is formed in an annular shape along the circumferential direction of the rotor yoke 46. Furthermore, by each abutment portion 94 abutting against the facing portion 80 via the adhesive 96, the adhesive strength of the rotor yoke 46 against the facing portion 80 can be improved.
• each groove 92 has an open portion 92A that opens to one axial side of the rotor yoke 46. Therefore, each groove 92 can be easily formed on the inner peripheral surface 90 of the rotor yoke 46, compared to, for example, a case in which each groove 92 does not have an open portion 92A and is closed to one axial side of the rotor yoke 46.
• FIG. 17 is a schematic cross-sectional view showing exaggerated dimensions of each part of a portion 24A of a rotor 24 according to the fourth embodiment.
• the opposing part 80 is located radially outside the rotor yoke 46, and an outer peripheral surface 98 of the rotor yoke 46 faces the opposing part 80 in the radial direction of the rotor yoke 46.
• the outer peripheral surface 98 is an example of an opposing surface in the present disclosure.
• a plurality of rotor magnets 48 are fixed to an inner peripheral surface 90 of the rotor yoke 46 by an adhesive 96.
• the inner peripheral surface 90 is an example of a surface opposite to the opposing surface in the present disclosure.
• a groove 92 is formed in the outer peripheral surface 98 of the rotor yoke 46.
• the groove 92 is located on one axial side of the rotor yoke 46 relative to the fixing surface 90A and the rotor magnet 48.
• a first abutment portion 94A is formed at a position on one axial side of the rotor yoke 46 relative to the groove 92, and a second abutment portion 94B is formed at a position on the other axial side of the rotor yoke 46 relative to the groove 92.
• FIG. 18 is an explanatory diagram illustrating the positional relationship between the opposing portion 80 of the support member 44, the groove 92 of the rotor yoke 46, and the multiple rotor magnets 48 according to the fourth embodiment.
• the opposing portion 80, the rotor yoke 46, and the multiple rotor magnets 48 are shown in a planar expanded state.
• the groove 92 falls within the range L of the length of the opposing portion 80 in the axial direction of the support member 44.
• the opposing portion 80 is located on one axial side of the rotor yoke 46 relative to the multiple rotor magnets 48.
• the groove 92 is formed on the outer peripheral surface 98 (see FIG. 17) of the rotor yoke 46, and is not formed on the opposing portion 80. This ensures the rigidity of the opposing portion 80, and therefore the rigidity of the support member 44, compared to when the groove 92 is formed on the opposing portion 80, for example. This allows both the weight reduction of the support member 44 by having multiple hollowed-out portions 50 (see FIG. 2) and the rigidity of the support member 44 to be ensured.
• the groove 92 is formed in the rotor yoke 46, which has a lower thermal expansion coefficient than the support member 44. Therefore, even in an environment with large temperature changes, distortion of the adhesive 96 contained in the groove 92 can be suppressed.
• the groove 92 is formed at a position offset in the axial direction of the rotor yoke 46 with respect to the rotor magnet 48. Therefore, for example, compared to when the groove 92 is formed at a position overlapping with the rotor magnet 48, it is possible to suppress a reduction in the thickness of the magnetic circuit portion of the rotor yoke 46. This makes it possible to ensure the magnetic characteristics of the motor 10 and the support rigidity of the rotor magnet 48 with respect to the rotor yoke 46.
• the groove 92 is also within the length range L of the opposing portion 80 in the axial direction of the support member 44. Therefore, compared to a case where the groove 92 is formed beyond the length range L of the opposing portion 80, for example, an appropriate amount of adhesive 96 can ensure the adhesive strength of the rotor yoke 46 to the support member 44.
• an abutment portion 94 is formed on the outer peripheral surface 98 of the rotor yoke 46, which abuts against the opposing portion 80 in the radial direction of the rotor yoke 46. Therefore, when an external disturbance acts on the rotor yoke 46, or when the rotor yoke 46 is assembled to the support member 44, the rotor yoke 46 can be prevented from tilting (falling over) relative to the opposing portion 80. This allows the center of gravity of the rotor yoke 46 to be aligned with the center of the rotation axis of the rotor yoke 46, ensuring the rotational balance of the rotor 24.
• the abutment portion 94 also has a first abutment portion 94A formed at a position on one axial side of the rotor yoke 46 relative to the groove 92, and a second abutment portion 94B formed at a position on the other axial side of the rotor yoke 46 relative to the groove 92. Therefore, compared to a case where the abutment portion 94 has only one of the first abutment portion 94A and the second abutment portion 94B, for example, the rotor yoke 46 can be more effectively prevented from tilting (falling over) relative to the opposing portion 80.
• the opposing portion 80 is located radially outward of the rotor yoke 46. Therefore, for example, the internal space of the rotor 24 can be expanded radially outward of the rotor 24 compared to when the opposing portion 80 is located radially inward of the rotor yoke 46.
• a magnetic flux path can be secured on the inner peripheral surface 90 side of the rotor yoke 46. This can improve the magnetic characteristics of the motor 10.
• FIG. 19 is a diagram showing a modified example of the rotor 24 according to the fourth embodiment.
• the groove 92 and the rotor magnet 48 partially overlap in the axial direction of the rotor yoke 46.
• the rotor 24 can be made smaller in the axial direction, for example, compared to a case in which the groove 92 and the rotor magnet 48 are misaligned in the axial direction of the rotor yoke 46.
• the fixing surface 90A can be secured up to the area that overlaps with the groove 92 in the axial direction of the rotor yoke 46. This improves the degree of freedom in arranging the rotor magnet 48 in the axial direction of the rotor yoke 46 compared to, for example, a case in which the groove 92 is formed on the inner peripheral surface 90 of the rotor yoke 46.
• the fifth embodiment has the following configuration changes compared to the first embodiment.
• Fig. 20 is a perspective view of a rotor yoke 46 according to the fifth embodiment.
• Fig. 21 is a schematic cross-sectional view of a portion 24A of a rotor 24 according to the fifth embodiment, with the dimensions of each portion exaggerated.
• the abutment portion 94 has a first abutment portion 94A and a second abutment portion 94B.
• the first abutment portion 94A and the second abutment portion 94B are formed by protruding portions of a portion of the rotor yoke 46 that bulge radially inward of the rotor yoke 46.
• Such protruding portions are formed, for example, by press working.
• the first abutment portion 94A and the second abutment portion 94B are formed by pressing, so that cavities 100 that open radially outward of the rotor yoke 46 are formed on the inside of the first abutment portion 94A and the inside of the second abutment portion 94B, respectively.
• the first abutment portion 94A and the second abutment portion 94B are an example of a convex portion in the present disclosure.
• a plurality of first abutment portions 94A are formed on the inner circumferential surface 90 at equal intervals in the circumferential direction of the rotor yoke 46.
• a plurality of second abutment portions 94B are formed on the inner circumferential surface 90 at equal intervals in the circumferential direction of the rotor yoke 46.
• the first abutment portion 94A and the second abutment portion 94B are formed side by side in the axial direction of the rotor yoke 46.
• the area between the first abutment portion 94A and the second abutment portion 94B on the inner circumferential surface 90 is formed as a groove 92 (see FIG. 21).
• FIG. 22 is a plan view showing a state where multiple rotor magnets 48 are provided on the inner peripheral surface 90 of a rotor yoke 46 according to the fifth embodiment.
• FIG. 23 is an explanatory diagram illustrating the positional relationship between the abutment portion 94, the groove 92 of the rotor yoke 46, and the multiple rotor magnets 48 according to the fifth embodiment.
• the abutment portion 94, the rotor yoke 46, and the multiple rotor magnets 48 are shown in a planar expanded state.
• Each abutment portion 94 falls within the width range W2 of each rotor magnet 48 in the circumferential direction of the rotor yoke 46.
• each abutment portion 94 is formed at a position outside the magnetic flux path M of the adjacent rotor magnets 48.
• the first abutment portion 94A and the second abutment portion 94B are formed by a convex portion of the rotor yoke 46 that bulges radially inward of the rotor yoke 46.
• the region between the first abutment portion 94 and the second abutment portion 94B on the inner circumferential surface 90 is formed as a groove 92. Therefore, for example, even if the groove 92 is not formed by cutting, the groove 92 can be formed on the inner circumferential surface 90 by forming the first abutment portion 94 and the second abutment portion 94B by pressing. This allows costs to be reduced compared to, for example, forming the groove 92 by cutting.
• each abutment portion 94 falls within the width range W2 of each rotor magnet 48 in the circumferential direction of the rotor yoke 46. Therefore, the first abutment portion 94A and the second abutment portion 94B, which have a cavity 100 on the inside, can be prevented from being positioned on the magnetic flux path M of the adjacent rotor magnet 48. This can improve the magnetic characteristics of the motor 10, for example, compared to when the first abutment portion 94A and the second abutment portion 94B are positioned on the magnetic flux path M.
• FIG. 24 is a perspective view of the rotor yoke 46 according to the sixth embodiment.
• a plurality of grooves 92 are formed.
• Each groove 92 is formed in an annular shape along the circumferential direction of the rotor yoke 46.
• the plurality of grooves 92 are formed side by side in the axial direction of the rotor yoke 46. There may be any number of the plurality of grooves 92.
• the abutment portion 94 has a first abutment portion 94A, a second abutment portion 94B, and a third abutment portion 94C.
• the first abutment portion 94A is formed at a position on one axial side of the rotor yoke 46 relative to the multiple grooves 92
• the second abutment portion 94B is formed at a position on the other axial side of the rotor yoke 46 relative to the multiple grooves 92.
• the third abutment portion 94C is formed between the multiple grooves 92.
• a plurality of grooves 92 aligned in the axial direction of the rotor yoke 46 are formed on the inner peripheral surface 90. Therefore, the width of each groove 92 along the axial direction of the rotor yoke 46 can be narrowed, for example, compared to a case in which a single groove 92 having the width of a plurality of grooves 92 is formed. This can improve the rigidity of the rotor yoke 46.
• the rotor yoke 46 can be more effectively prevented from tilting (falling over) relative to the opposing portion 80 compared to, for example, a case in which the abutment portion 94 has only the first abutment portion 94A and the second abutment portion 94B.
• FIG. 25 is a perspective view of a rotor yoke 46 according to the seventh embodiment.
• a plurality of grooves 92 are formed on an inner peripheral surface 90 of the rotor yoke 46 according to the seventh embodiment.
• the plurality of grooves 92 are formed to have the same shape.
• the plurality of grooves 92 are formed in a line at equal intervals in the circumferential direction of the rotor yoke 46. There may be any number of the plurality of grooves 92.
• Each groove 92 is formed with its longitudinal direction in the axial direction of the rotor yoke 46.
• Each groove 92 is open at one end on one axial side of the rotor yoke 46. That is, each groove 92 has an open portion 92A that opens to one axial side of the rotor yoke 46.
• the end of each groove 92 on the other axial side of the rotor yoke 46 is closed.
• the area between each adjacent groove 92 is formed as an abutment portion 94.
• a plurality of grooves 92 are formed in a line in the circumferential direction of the rotor yoke 46. Therefore, the thickness of the rotor yoke 46 can be ensured between adjacent grooves 92. This improves the rigidity of the rotor yoke 46 compared to, for example, a case in which the grooves 92 are formed in an annular shape in the circumferential direction of the rotor yoke 46.
• the grooves 92 are formed in the same shape and are arranged at equal intervals around the circumference of the rotor yoke 46. This allows the center of gravity of the rotor yoke 46 to be aligned with the center of the rotational axis of the rotor yoke 46. This ensures the rotational balance of the rotor 24.
• the area between adjacent grooves 92 is formed as an abutment portion 94. Therefore, the area where the abutment portion 94 and the facing portion 80 abut can be enlarged, for example, compared to when the grooves 92 are formed in an annular shape along the circumferential direction of the rotor yoke 46. This improves the support rigidity of the rotor yoke 46 against the facing portion 80.
• the abutment portion 94 functions as a rigid portion between adjacent grooves 92, the rigidity of the rotor yoke 46 can be improved, for example, compared to when the grooves 92 are formed in an annular shape along the circumferential direction of the rotor yoke 46.
• the abutment portion 94 abuts against the facing portion 80 via the adhesive 96, so that the adhesive strength of the rotor yoke 46 against the facing portion 80 can be improved.
• each groove 92 has an open portion 92A that opens to one axial side of the rotor yoke 46. Therefore, each groove 92 can be easily formed on the inner peripheral surface 90 of the rotor yoke 46, compared to, for example, a case in which each groove 92 does not have an open portion 92A and is closed to one axial side of the rotor yoke 46.
• the eighth embodiment has a configuration modified from the first embodiment as follows.
• Figure 26 is a schematic cross-sectional view showing an exaggerated dimension of each part of a part 24A of a rotor 24 according to the eighth embodiment.
• the groove 92 is open at one end on one axial side of the rotor yoke 46. That is, the groove 92 has an opening 92A that opens to one axial side of the rotor yoke 46.
• the groove 92 is formed with an inclined bottom so that the depth dimension decreases from one axial side to the other axial side of the rotor yoke 46.
• the groove 92 is formed with an inclined bottom so that the depth dimension decreases from one side to the other side in the axial direction of the rotor yoke 46. Therefore, the thickness of the rotor yoke 46 in the portion of the groove 92 facing the rotor magnet 48 can be ensured. This makes it possible to improve the support rigidity of the rotor magnet 48 relative to the rotor yoke 46, for example, compared to a case in which the depth dimension of the groove 92 is constant in the axial direction of the rotor yoke 46.
• the thickness of the magnetic circuit portion of the rotor yoke 46 is ensured in the portion of the groove 92 facing the rotor magnet 48, which helps prevent the magnetic characteristics of the motor 10 from deteriorating.
• FIG. 27 is an explanatory diagram for explaining the positional relationship between the opposing portion 80 of the support member 44, the groove 92 of the rotor yoke 46, and the multiple rotor magnets 48 according to the ninth embodiment.
• the opposing portion 80, the rotor yoke 46, and the multiple rotor magnets 48 are shown in a planar developed state.
• Each groove 92 is formed in a tapered shape in which the width in the circumferential direction of the rotor yoke 46 narrows toward the rotor magnet 48 side.
• Each groove 92 is formed in a triangular shape when viewed from the radial inside of the rotor yoke 46. In other words, the end of the groove 92 on the rotor magnet 48 side is angular.
• the tapered shape of each groove 92 is set to a shape that removes the groove 92 from the magnetic flux path M of the adjacent rotor magnet 48.
• each groove 92 is off the magnetic flux path M of the adjacent rotor magnet 48. Therefore, it is possible to prevent the thinned portions caused by the formation of each groove 92 from being positioned on the magnetic flux path M, and therefore it is possible to ensure the thickness of the rotor yoke 46 on the magnetic flux path M, compared to when, for example, the thinned portions caused by the formation of each groove 92 are positioned on the magnetic flux path M. This makes it possible to prevent the magnetic characteristics of the motor 10 from deteriorating.
• each groove 92 is formed in a tapered shape such that the width in the circumferential direction of the rotor yoke 46 narrows toward the rotor magnet 48 side. Therefore, it is possible to prevent the thinned portions caused by the formation of each groove 92 from being positioned on the magnetic flux path M. This makes it possible to prevent the magnetic characteristics of the motor 10 from deteriorating.
• each groove 92 in a tapered shape, it is possible to ensure the length of the groove 92 in the axial direction of the rotor yoke 46 while preventing the thinned portions caused by the formation of each groove 92 from being positioned on the magnetic flux path M. This makes it possible to ensure the amount of adhesive 96, thereby ensuring the adhesive strength of the rotor yoke 46 to the opposing portion 80.
• FIG. 28 shows a modified example of the grooves 92 according to the ninth embodiment.
• each groove 92 is formed in a semicircular or semi-elliptical shape when viewed from the radial inside of the rotor yoke 46.
• the end of the groove 92 on the rotor magnet 48 side is arc-shaped. Even with this configuration, the same effect as above can be obtained.
• a shaft 32; A stator (22) provided coaxially with the shaft; A rotor yoke (46) provided around the stator; a support member (44) for supporting the rotor yoke relative to the shaft; Equipped with The support member has an opposing portion (80) facing the rotor yoke in a radial direction of the rotor yoke, A groove (92) is formed in an opposing surface (90; 98) of the rotor yoke that faces the opposing portion and that accommodates an adhesive (96) that bonds the opposing portion and the opposing surface.
• Motor (10).
• a rotor magnet (48) is provided on the opposing surface, The groove is formed at a position offset in the axial direction of the rotor yoke with respect to the rotor magnet.
• the motor according to the first aspect. The groove is within a range of the length of the opposing portion in the axial direction of the support member.
• the motor according to the first or second aspect. The groove is formed in an annular shape along the circumferential direction of the rotor yoke. The motor according to any one of the first to third aspects.
• a rotor magnet is provided on a surface of the rotor yoke opposite to the opposing surface, A portion of the groove and a portion of the rotor magnet overlap with each other in the axial direction of the rotor yoke.
• the motor according to the first aspect.
• a plurality of the grooves are formed on the opposing surface and aligned in the axial direction of the rotor yoke.
• the motor according to any one of the first to fifth aspects.
• the motor according to any one of the first to third aspects, wherein a plurality of the grooves are formed in the opposing surface and aligned in a circumferential direction of the rotor yoke.
• a plurality of rotor magnets are provided on the opposing surface and are arranged in a circumferential direction of the rotor yoke. Each of the grooves is within a range of the width of each of the rotor magnets in the circumferential direction of the rotor yoke.
• a motor according to a seventh aspect. A plurality of rotor magnets are provided on the opposing surface and are arranged in a circumferential direction of the rotor yoke. a region between adjacent grooves in the opposing surface is located on a magnetic flux path of adjacent rotor magnets; The motor according to the seventh or eighth aspect.
• Each of the grooves has an opening portion that opens to one axial side of the rotor yoke.
• the motor according to any one of the seventh to ninth aspects.
• a rotor magnet is provided on the opposing surface, The grooves are formed at positions offset in the axial direction of the rotor yoke with respect to the rotor magnet, Each of the grooves is formed in a tapered shape such that the width in the circumferential direction of the rotor yoke becomes narrower toward the rotor magnet.
• a motor according to any one of the seventh to tenth aspects.
• a plurality of rotor magnets are provided on the opposing surface and are arranged in a circumferential direction of the rotor yoke. Each of the grooves is out of the magnetic flux path of the adjacent rotor magnet.
• a motor according to any one of the seventh to eleventh aspects. (Thirteenth aspect) A contact portion (94) that contacts the opposing portion in the radial direction of the rotor yoke is formed on the opposing surface.
• the motor according to any one of the first to eleventh aspects. (14th aspect)
• the abutment portion is formed at a position offset in the axial direction of the rotor yoke with respect to the groove.
• a rotor magnet is provided on the opposing surface, The contact portion is formed at a position shifted in the axial direction of the rotor yoke with respect to the rotor magnet.
• the abutment portion includes a first abutment portion formed at a position on one axial side of the rotor yoke with respect to the groove; a second contact portion formed at a position on the other axial side of the rotor yoke with respect to the groove, A motor according to any one of the thirteenth to fifteenth aspects.
• the abutment portion is formed in an annular shape along the circumferential direction of the rotor yoke.
• a plurality of the abutment portions are formed on the opposing surface and are aligned in a circumferential direction of the rotor yoke, The groove is open to one axial end of the rotor yoke between adjacent contact portions.
• a motor according to any one of the thirteenth to sixteenth aspects. (21st aspect) A plurality of the grooves are formed in the opposing surface and are aligned in a circumferential direction of the rotor yoke, The motor according to any one of the thirteenth to sixteenth aspects, wherein the abutment portion is formed in a region between adjacent ones of the grooves on the opposing surface.
• the abutment portion is formed by a protrusion that bulges outward in a radial direction of the rotor yoke.
• a motor according to any one of the thirteenth to sixteenth aspects.
• wenty-third aspect A plurality of rotor magnets are provided on the opposing surface and are arranged in a circumferential direction of the rotor yoke.
• a plurality of the protrusions are formed on the opposing surface and are aligned in a circumferential direction of the rotor yoke, Each of the protrusions is within a range of the width of each of the rotor magnets in the circumferential direction of the rotor yoke.
• the opposing portion is located radially inside the rotor yoke, The motor according to any one of the first to twenty-third aspects, wherein the opposing surface is an inner circumferential surface (90) of the rotor yoke. (25th aspect) the opposing portion is located radially outward of the rotor yoke, The motor according to any one of the first to twenty-third aspects, wherein the opposing surface is an outer circumferential surface (98) of the rotor yoke.

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• Engineering & Computer Science (AREA)
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• Permanent Field Magnets Of Synchronous Machinery (AREA)

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• 2023
  • 2023-02-22 JP JP2023026589A patent/JP2024119584A/ja active Pending
  • 2023-12-04 DE DE112023005832.6T patent/DE112023005832T5/de active Pending
  • 2023-12-04 WO PCT/JP2023/043351 patent/WO2024176567A1/ja not_active Ceased
  • 2023-12-04 CN CN202380094580.2A patent/CN120787404A/zh active Pending
• 2025
  • 2025-08-19 US US19/303,803 patent/US20250385559A1/en active Pending

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