WO2023234127A1 - モータフレーム及びモータ装置 - Google Patents

モータフレーム及びモータ装置 Download PDF

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Publication number
WO2023234127A1
WO2023234127A1 PCT/JP2023/019211 JP2023019211W WO2023234127A1 WO 2023234127 A1 WO2023234127 A1 WO 2023234127A1 JP 2023019211 W JP2023019211 W JP 2023019211W WO 2023234127 A1 WO2023234127 A1 WO 2023234127A1
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WO
WIPO (PCT)
Prior art keywords
motor
motor frame
axis
thickness
extends
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/019211
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English (en)
French (fr)
Japanese (ja)
Inventor
智也 下川
宜農 麻生
正之 森岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to JP2024524773A priority Critical patent/JPWO2023234127A1/ja
Priority to US18/867,470 priority patent/US20260018959A1/en
Priority to EP23815886.9A priority patent/EP4535624A4/en
Priority to CN202380042552.6A priority patent/CN119256474A/zh
Publication of WO2023234127A1 publication Critical patent/WO2023234127A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/06—Cast metal casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the present disclosure relates to a motor frame and a motor device. More specifically, the present disclosure relates to a motor frame including a cylindrical body having four planar outer wall surfaces and a cylindrical inner wall surface, and a motor device including this motor frame.
  • Patent Document 1 discloses a permanent magnet motor that includes a stator core, a cylindrical frame, a plurality of spacers, and a rotor core.
  • the stator core is made of a cylindrical magnetic material, has a plurality of slots wound with wire, and has a plurality of first axial grooves formed at equal intervals in the circumferential direction on the outer periphery.
  • a circular hole having an inner diameter larger than the outer diameter of the stator core and in which the stator core is installed is formed in the cylindrical frame, and a plurality of second axial grooves are formed in the circular hole at positions opposite to the first axial grooves.
  • An axial groove is formed.
  • the plurality of spacers are tightly fitted into the plurality of first and second axial grooves, and fix the stator core to the frame with a gap therebetween.
  • the rotor core is rotatably supported by a frame and installed within the stator core, has a plurality of permanent magnets on its outer periphery, and is made of a cylindrical magnetic body.
  • the stator core is not fixed by shrink-fitting to a frame whose wall thickness varies widely in the circumferential direction, but is arranged at equal intervals in the circumferential direction with a gap between the inner periphery of the frame and the outer periphery of the stator core. It is fixed to the frame via a plurality of spacers of the same shape.
  • the stator core is formed evenly from a plurality of spacers of the same shape arranged at equal intervals in the circumferential direction. , there is no difference in the stress generated in the stator core, no distortion is given to the magnetic circuit of the stator core, and cogging torque is not worsened.
  • Patent Document 1 since the frame described in Patent Document 1 has a rectangular outer shape, it is difficult to attach it to an external member.
  • An object of the present disclosure is to provide a motor frame that is easy to attach to an external member and that is easy to suppress the effects of uneven thickness in the circumferential direction, and a motor device equipped with the same.
  • a motor frame includes a cylindrical body that is inserted into the cylindrical body and penetrates in the direction in which the axis of the rotating shaft of the motor extends.
  • the cylindrical main body has four outer wall surfaces, an inner wall surface, and four connection parts.
  • the four outer wall surfaces are arranged so as to surround the rotation axis, and each has a planar shape along the rotation axis.
  • the inner wall surface has a cylindrical inner surface shape that surrounds and extends along the rotation axis.
  • Each of the four connecting portions is located at each of four boundaries formed by adjacent outer wall surfaces among the four outer wall surfaces.
  • Each of the four connecting portions has a stress relaxation groove recessed toward the axis at the boundary between the two adjacent outer wall surfaces.
  • At least one of the connection parts has the stress relaxation groove in a part along the direction in which the axis extends, and the stress relaxation groove is not formed in another part in the direction in which the axis extends. It has a fleshy part.
  • a motor device includes the motor frame and the motor fitted into the cylindrical body of the motor frame.
  • the motor frame and motor device of the present disclosure are easy to attach to external members, and it is easy to suppress the effects of uneven wall thickness in the circumferential direction of the motor frame.
  • FIG. 1 is an exploded perspective view of a motor device according to a first embodiment of the present disclosure.
  • FIG. 2 is a front view of the motor device according to the first embodiment of the present disclosure.
  • FIG. 3 is a perspective view of a motor frame included in the motor device according to the first embodiment of the present disclosure.
  • FIG. 4 is a side view of the motor frame according to the first embodiment of the present disclosure.
  • FIG. 5 is a top view of the motor frame according to the first embodiment of the present disclosure.
  • FIG. 6 is a diagram showing the relationship between angle ⁇ and wall thickness t of the motor frame according to the first embodiment of the present disclosure.
  • FIG. 7 is a graph diagram showing the shape of the inner diameter of the stator core of the motor according to the first embodiment of the present disclosure.
  • FIG. 8 is a graph diagram showing the shape of the inner diameter of the stator core when a motor frame motor of a comparative example is inserted.
  • FIG. 9 is a diagram showing the relationship between each order and the amplitude in the order when the thickness function of the motor frame according to the first embodiment of the present disclosure is expanded into a Fourier series.
  • FIG. 10 is an exploded perspective view of a motor device according to a second embodiment of the present disclosure.
  • FIG. 11 is a front view of a motor device according to a second embodiment of the present disclosure.
  • FIG. 12 is a perspective view of a motor frame included in a motor device according to a second embodiment of the present disclosure.
  • FIG. 1 is an exploded perspective view of a motor device 1 according to a first embodiment of the present disclosure.
  • FIG. 2 is a front view of the motor device 1.
  • FIG. 3 is a perspective view of the motor frame 3 included in the motor device 1.
  • the motor frame 3 according to the present disclosure includes a cylindrical main body 30 that penetrates in the direction in which the axis 20 of the rotating shaft 23 of the motor 2 that is fitted into the main body extends.
  • the cylindrical main body 30 has four outer wall surfaces 4, an inner wall surface 5, and four connection parts 6.
  • the four outer wall surfaces 4 are arranged so as to surround the rotation axis 23, and each has a planar shape along the rotation axis 23.
  • the inner wall surface 5 surrounds the rotating shaft 23 and has a cylindrical inner surface shape along the rotating shaft 23.
  • the four connecting portions 6 are located between adjacent outer wall surfaces 4 among the four outer wall surfaces 4, respectively.
  • Each of the four connecting portions 6 has a stress relaxation groove 7 recessed toward the axis 20 at the boundary between both adjacent outer wall surfaces 4 .
  • At least one connection part 6 has a stress relaxation groove 7 in a part in the direction in which the shaft center 20 extends, and a flesh part in which the stress relaxation groove 7 is not formed in the other part in the direction in which the shaft center 20 extends. It has 8.
  • the motor device 1 includes a motor frame 3 and a motor 2 fitted into the cylindrical main body 30 of the motor frame 3.
  • the stress distribution applied to the stator 21 is made uniform, and the stator 21 is By making the shape closer to a perfect circle, it becomes easier to reduce the cogging torque generated in the motor 2. Further, since the flesh portion 8 is formed, it becomes easier to attach the cylindrical main body 30 to an external member.
  • FIG. 1 is an exploded perspective view of a motor device 1 according to a first embodiment of the present disclosure.
  • FIG. 2 is a front view of the motor device 1 according to the first embodiment of the present disclosure.
  • the motor device 1 includes a motor (electric motor) 2 and a motor frame 3 into which the motor 2 is fitted.
  • the motor 2 is a so-called servo motor.
  • the motor device 1 further includes a position detector 121, a bracket 12, a detector cover 13, and a seal 122.
  • the position detector 121 is a so-called rotary encoder.
  • the position detector 121 converts the amount of displacement in the rotation of the rotor of the motor 2 around the axis into a digital amount.
  • the bracket 12 is a member for attaching the position detector 121 to the motor frame 3.
  • the bracket 12 is a plate-like member having an opening inside.
  • the position detector 121 is attached to the bracket 12 by an appropriate attachment method such as screwing.
  • the bracket 12 to which the position detector 121 is attached is attached to the motor frame 3 by an appropriate attachment method such as screwing.
  • a seal 122 is interposed between the bracket 12 and the motor frame 3. That is, the bracket 12 is attached to the motor frame 3 via the seal 122.
  • the detector cover 13 has a frame portion 131 and a lid portion 132.
  • the lid portion 132 is attached to the frame portion 131 by an appropriate attachment method such as screwing.
  • the frame portion 131 is attached to the motor frame 3 by an appropriate attachment method such as screwing.
  • the motor 2 includes a stator 21, a rotor 22, and a rotating shaft 23.
  • the stator 21 is fitted into the motor frame 3 by shrink fitting.
  • the stator 21 generates magnetic force for rotating the rotor 22.
  • Stator 21 has a stator core and a winding coil.
  • the rotor 22 is arranged within the motor frame 3 (stator 21) so as to be rotatable with respect to the stator 21.
  • the motor 2 is an inner rotor type motor in which a rotor 22 is disposed inside a stator 21.
  • the rotor 22 is surrounded by a stator core and rotates by the magnetic force generated by the stator core.
  • a plurality of north and south poles of magnets are arranged repeatedly along the rotation direction.
  • the rotor 22 is a surface magnet type rotor in which a permanent magnet is attached to the surface of the rotor core.
  • the rotating shaft 23 is a shaft fixed to the center of the rotor 22.
  • the rotor 22 and the rotating shaft 23 rotate about the axis 20 of the rotating shaft 23 as a rotation center.
  • the rotating shaft 23 is made of metal and extends in both directions along the axis 20 of the rotor 22 .
  • the rotating shaft 23 is fixed to the rotor 22 by being fitted into an opening formed in the center of the rotor 22 by shrink fitting.
  • the rotating shaft 23 is rotatably supported by the stator 21 by a first bearing and a second bearing.
  • the motor 2 further includes a first bearing and a second bearing.
  • the first bearing and the second bearing are rolling bearings that rotatably support the rotating shaft 23.
  • the first bearing is fitted into the motor frame 3 and attached to the motor frame 3.
  • the second bearing is attached to the bracket 12 by an appropriate attachment method such as screwing.
  • FIG. 3 is a perspective view of the motor frame 3 included in the motor device according to the first embodiment of the present disclosure.
  • FIG. 4 is a side view of the motor frame 3 according to the first embodiment of the present disclosure.
  • FIG. 5 is a top view of the motor frame 3 according to the first embodiment of the present disclosure.
  • the motor frame 3 is attached with the motor 2 and holds the motor 2.
  • the motor frame 3 includes a cylindrical main body 30.
  • the motor 2 is fitted into the cylindrical main body 30.
  • the cylindrical main body 30 has a cylindrical shape that penetrates in the direction in which the axis 20 of the rotating shaft 23 of the motor 2 extends.
  • the cylindrical main body 30 has two end surfaces (first end surface 31 and second end surface 32) and four outer wall surfaces 4 (first outer wall surface 41, second outer wall surface 42, third outer wall surface 42, and outer wall surface 43 and fourth outer wall surface 44), inner wall surface 5, and four connecting portions 6 (first connecting portion 61, second connecting portion 62, third connecting portion 63, and fourth connecting portion 64). , has.
  • the front-rear direction and left-right direction are defined for convenience.
  • the direction in which the axis 20 of the rotating shaft 23 extends is referred to as the front-rear direction, one of which is the front and the other is the rear.
  • the left and right sides when looking from the front to the rear are respectively referred to as the left side and the right side.
  • the cylindrical main body 30 has a first end surface 31 at the front and a second end surface 32 at the rear.
  • the outer peripheral edge of the first end surface 31 has a generally quadrangular shape, more specifically a rectangular shape, and more specifically a square shape.
  • the inner peripheral edge of the first end surface 31 has a circular shape.
  • the normal line of the first end surface 31 faces forward.
  • the outer peripheral edge of the second end surface 32 has a generally square shape, more specifically a rectangular shape, and more specifically a square shape.
  • the inner peripheral edge of the second end surface 32 has a circular shape.
  • the normal line of the second end surface 32 faces rearward.
  • the outer circumferential edge of the first end surface 31 and the outer circumferential edge of the second end surface 32 have approximately the same size when viewed in the direction in which the axis 20 extends.
  • the cylindrical main body 30 has a square shape when viewed in the direction in which the axis 20 extends.
  • the inner peripheral edge of the first end surface 31 is larger than the inner peripheral edge of the second end surface 32 when viewed in the direction in which the axis 20 extends.
  • the inner circumferential edge of the first end face 31 is approximately the same size as the outer circumferential edge of the stator 21 of the motor 2 , but the inner circumferential edge of the second end face 32 is smaller than the outer circumferential edge of the stator 21 of the motor 2 .
  • the stator 21 can be inserted into the cylindrical body 30 from the first end surface 31, but cannot be inserted from the second end surface 32.
  • the four external wall surfaces 4 are arranged so as to surround the rotation axis 23, and each has a planar shape along the rotation axis 23.
  • the outer wall surface 4 whose normal line points to the right is the first outer wall surface 41
  • the outer wall surface 4 whose normal line points upward is the second outer wall surface 42
  • the normal line points to the left side is referred to as a third outer wall surface 43
  • the outer wall surface 4 whose normal line faces downward is referred to as a fourth outer wall surface 44.
  • Each of the first outer wall surface 41 to the fourth outer wall surface 44 is constituted by a plane. Note that some of the first to fourth outer wall surfaces 41 to 44 may have portions that do not constitute a plane.
  • the first to fourth outer wall surfaces 41 to 44 have a generally rectangular shape when viewed from the front. That is, the first outer wall surface 41 has a generally rectangular shape when viewed from the right, the second outer wall surface 42 has a generally rectangular shape when viewed from above, and the third outer wall surface 43 has a generally rectangular shape when viewed from the left. It has a generally rectangular shape when viewed from above, and the fourth outer wall surface 44 has a generally rectangular shape when viewed from below.
  • the cylindrical main body 30 has a rectangular shape when viewed from any of the left, upper, left, and lower sides.
  • the cylindrical main body 30 has a through hole 33 formed in one outer wall surface 4 (second outer wall surface 42 as an example) that penetrates in the inner and outer directions perpendicular to the front-rear direction. Wiring to the motor 2 fitted into the cylindrical body 30 can be passed through the through hole 33 from the outside of the cylindrical body 30 .
  • the inner wall surface 5 has a cylindrical inner surface shape that surrounds the rotating shaft 23 and extends along the rotating shaft 23. Note that FIG. 3 shows only the motor frame 3. A stator 21 of the motor 2 is fitted into the inner wall surface 5 .
  • connection portion 6 is located between adjacent outer wall surfaces of the four outer wall surfaces 4, respectively.
  • the connecting portion 6 between the first outer wall surface 41 and the second outer wall surface 42 is referred to as the first connecting portion 61
  • 6 is the second connecting portion 62
  • the connecting portion 6 between the third outer wall surface 43 and the fourth outer wall surface 44 is the third connecting portion 63
  • the connecting portion 6 between the fourth outer wall surface 44 and the first outer wall surface 41 is the third connecting portion 63
  • the connecting portion 6 between the fourth outer wall surface 44 and the first outer wall surface 41 is This is referred to as a fourth connection portion 64.
  • Each of the four connecting portions 6 has a stress relief groove 7 that is recessed toward the axis 20 at the boundary between both adjacent outer wall surfaces 4 .
  • each connection part 6 there is a stress relaxation groove 7 recessed inward (in the direction toward the axis 20) from a virtual extension surface of the plane constituting the outer wall surface 4 adjacent to each other in both directions of the connection part 6. It is formed.
  • the stress relaxation groove 7 is a groove extending in the direction in which the axis 20 extends, and is open at least in the normal direction of the adjacent outer wall surface 4. Further, the stress relaxation groove 7 may be open in the direction in which the axis 20 extends.
  • Each of the four connecting portions 6 has a stress relaxation groove 7 over the entire length of the portion where the contact portion is located in the front-rear direction.
  • the fitted stator 21 contacts the entire length in the front-rear direction of the portion of the inner wall surface 5 where the step portion 51 is formed.
  • connection portion 6 has a flesh portion 8.
  • the flesh portion 8 is a portion of the connection portion 6 where the stress relaxation groove 7 is not formed.
  • One of the connecting parts 6 in which the flesh part 8 is formed has a stress relaxation groove 7 in a part in the direction in which the axis 20 extends, and has a flesh part 8 in the other part in the direction in which the axis 20 extends. is formed.
  • stress relaxation grooves 7 and flesh portions 8 are formed in all of the first to fourth connection portions 61 to 64.
  • a first flesh portion 81 is formed at the front end of the connection portion 6 (cylindrical main body 30 ), and a second flesh portion 82 is formed at the rear end of the connection portion 6 .
  • the first connection part 61 and the third connection part 63 the first meat part 81 is not formed, but only the second meat part 82 is formed.
  • the stress relaxation grooves 7 formed in the first connecting portion 61 and the third connecting portion 63 are not open to the rear, but are open to the front.
  • both the first flesh portion 81 and the second flesh portion 82 are formed in the second connection portion 62 and the fourth connection portion 64 . Therefore, the stress relaxation grooves 7 formed in the second connection part 62 and the fourth connection part 64 are not open to either the front or the rear.
  • the thickness of the cylindrical main body 30 in the inner and outer directions orthogonal to the front-rear direction is defined as the wall thickness t (mm).
  • the angle from the reference line 10 around the axis 20 of an arbitrary point of the cylindrical main body 30 when viewed from the front-rear direction is defined as an angle ⁇ (rad).
  • the units of the thickness t and the angle ⁇ are for convenience, and the unit of the thickness t may not be (mm), and the unit of the angle ⁇ may not be (rad).
  • FIG. 6 shows a t- ⁇ relationship diagram in the first embodiment.
  • the thickness t is the thickness of the central part of the part which contacts the stator 21 fitted inside in the direction in which the shaft center 20 extends.
  • the angle ⁇ is expressed in (°).
  • the stress relaxation grooves 7 are formed in all of the first to fourth connecting portions 61 to 64, so that the t- ⁇ relationship diagram is shown in FIG.
  • FIG. 7 shows a change in the shape of the inner diameter of the stator core 21 when the motor 2 is fitted into the cylindrical body 30. That is, FIG.
  • FIG. 7 is a graph showing the shape of the inner diameter of the stator core 21 of the motor 2 according to the first embodiment of the present disclosure.
  • the graph shown in FIG. 7 shows the angle ⁇ from the reference line 10 around the axis 20 of an arbitrary point of the cylindrical body 30, and the inner diameter of the stator core 21 before and after the motor 2 is fitted at the position of this angle ⁇ . shows the change in
  • the range shown by the dot pattern in FIG. 7 is the range in which the shape formed by the relationship line between the change in the inner diameter of the stator core 21 and ⁇ is acceptable as a circle. Further, in FIG.
  • a circumference C indicating 0 in the center of the dot pattern represents the shape of the inner diameter of the stator core 21 before the motor 2 is fitted into the cylindrical main body 30.
  • the closer to a perfect circle the shape of the line indicating the inner diameter of the stator core 21 after the motor 2 is fitted the more the cogging torque generated in the motor 2 can be suppressed.
  • the line indicating the inner diameter of the stator core 21 after the motor 2 is fitted becomes close to a circle, and it can be seen that the non-uniformity of the inner diameter of the stator core 21 is alleviated.
  • FIG. 8 shows changes in the inner diameter of the stator core 21 when the motor 2 is fitted into the cylindrical body 30. That is, FIG. 8 shows the angle ⁇ of an arbitrary point of the cylindrical body 30 from the reference line 10 around the axis 20 and the angle ⁇ at this angle ⁇ position when the motor 2 is inserted into the motor frame of the comparative example.
  • FIG. 8 It is a graph showing the change in the inner diameter of the stator core 21 before and after the motor 2 is fitted. Note that the range indicated by the dot pattern in FIG. 8 is a range within which the inner diameter of the stator core 21 is permissible as a circle. Further, in FIG. 8, a circumference C indicating 0 in the center of the dot pattern represents the shape of the inner diameter of the stator core 21 before the motor 2 is fitted. In the graph shown in FIG.
  • the non-uniformity of the stress distribution applied to the stator 21 in the motor device 1 increases, and the cogging torque generated in the motor 2 increases.
  • the cylindrical main body 30 in the first embodiment by having the stress relaxation grooves 7, the non-uniformity of the shape of the inner diameter of the stator core 21 is alleviated, as shown in FIG. Therefore, the stress distribution applied to the stator 21 can be made uniform, so that the shape of the stator 21 can be made close to a perfect circle, and the cogging torque generated in the motor 2 can be easily reduced.
  • the minimum thickness t of the portion with the stress relaxation groove 7 is the same as the minimum thickness t of the portion without the stress relaxation groove 7.
  • the minimum thickness t of the portion having the stress relaxation groove 7 is determined by the angle ⁇ being (1/4) ⁇ , (3/4) ⁇ , (5/4) ⁇ , (7/4) ⁇ ( rad) is the wall thickness t at the position.
  • the minimum wall thickness t of the portion without the stress relaxation groove 7 is the wall thickness at the position where the angle ⁇ is (1/2) x ⁇ , ⁇ , (3/2) x ⁇ , 2 x ⁇ (rad). It is t.
  • the four connecting portions 6 have stress relaxation grooves 7 over the entire length of the portion where the contact portions are located in the front-rear direction. As a result, non-uniformity in the inner diameter of the stator core 21 can be more easily alleviated.
  • FIG. 9 shows a graph of the result of Fourier series expansion of the thickness function for the motor frame 3 in the first embodiment. That is, FIG. 9 is a relationship diagram between the order and the amplitude in the order when the thickness function of the motor frame 3 according to the first embodiment of the present disclosure is expanded into a Fourier series.
  • the horizontal axis indicates each order, and the vertical axis indicates the amplitude (mm). Note that a description of the phase of the result of Fourier series expansion will be omitted.
  • T2 (mm) which is the coefficient of the quadratic term of the result of Fourier series expansion, satisfies T2 ⁇ Tave ⁇ 0.25.
  • T2 ⁇ Tave ⁇ 0.25 is satisfied.
  • T2 which is the coefficient of the second-order term of the result of Fourier series expansion
  • T2 increases in the positive direction, that is, the radius, when viewed from the circumference C of the stator core 21 at a pair of diagonal angles ⁇ .
  • the change in direction is large, and at another pair of angles ⁇ perpendicular to the pair of angles ⁇ , there is a strong tendency for the change in the negative direction, that is, the direction in which the radius decreases, to be large when viewed from the circumference C of the stator core 21.
  • T2 (mm) which is the coefficient of the second-order term of the result of Fourier series expansion, satisfies T2 ⁇ Tave ⁇ 0.25, so that the shape of the stator 21 can be adjusted to make the stress distribution applied to the stator 21 uniform. By making it close to a perfect circle, it becomes easier to suppress the cogging torque generated in the motor 2.
  • FIG. 10 is an exploded perspective view of the motor device 1 according to the second embodiment of the present disclosure.
  • FIG. 11 is a front view of the motor device 1 according to the second embodiment of the present disclosure.
  • FIG. 10 is a perspective view of a motor frame 3 according to a second embodiment of the present disclosure.
  • the difference between the motor frame 3 shown in the first embodiment and the motor frame 3 shown in the second embodiment is that the motor frame 3 shown in the second embodiment is provided with a step 51 and a protrusion 811. and a resin injection port 91 is provided.
  • the other structure of the motor frame 3 shown in FIG. 10 is the same as that of the motor frame 3 shown in FIG. 3.
  • the stator 21 of the motor 2 is fitted into the inner wall surface 5 of the motor frame 3.
  • the inner wall surface 5 itself becomes a contact portion with the motor 2 fitted inside.
  • the first flesh portion 81 constitutes a mounting portion to which a specific member is attached.
  • the first flesh portion 81 which serves as the attachment portion, has a protrusion 83.
  • a fixing hole 811 into which a bolt is screwed is formed in the protrusion 83.
  • the protruding portion 83 is a flesh portion for providing a space necessary for arranging a member above the through hole 33.
  • the bolt is rotated using a tool such as a screwdriver.
  • the member is, for example, a member for waterproofing or dustproofing the motor device 1, but is not particularly limited.
  • a fixing hole 311 into which a bolt is screwed is formed in the first end surface 31, and the bracket 12 is attached by the bolt screwed into the fixing hole 311.
  • the second flesh portion 82 of the first connecting portion 61 and the third connecting portion 63 constitute a mounting portion for attaching the motor frame 3 to an external device.
  • a through hole 821 is formed in the second flesh part 82 of the first connecting part 61 and the third connecting part 63, and the cylindrical main body 30 is fixed with a fastening tool consisting of a bolt and a nut. Attach to external equipment.
  • the fixing tool is rotated using a tool such as a wrench or a screwdriver. At this time, the operator can insert the tool into the stress relief groove 7, making it easier to fasten the fastener.
  • the inner wall surface 5 is formed with a stepped portion 51 that has a slightly smaller diameter in a portion in the direction in which the axis extends (i.e., the front-back direction) than in the front and rear portions. .
  • This stepped portion 51 becomes a contact portion with the motor 2 fitted inside.
  • the position detector 121 may be a slip ring, for example, and is not limited to a rotary encoder.
  • the motor 2 is not limited to a servo motor.
  • the rotor 22 is not limited to a surface magnet type rotor.
  • the through hole 33 has an arbitrary configuration and does not need to be formed in the cylindrical main body 30.
  • the inner wall surface 5 may include a portion that does not constitute the cylindrical inner surface. Further, on the inner wall surface 5, the contact portion with the stator 21 of the motor 2 fitted therein may extend over the entire length in the direction in which the axis extends (ie, the front-rear direction). Further, the contact portion of the inner wall surface 5 with the stator 21 of the motor 2 that is fitted into the interior may or may not be formed by the stepped portion 51. That is, the front and rear portions of the contact portion and the contact portion may be on the same plane extending in the front-rear direction.
  • the range in which the stress relaxation grooves 7 are formed does not have to cover the entire length in the front-rear direction of the portion where the contact portion is located.
  • the specific member attached to the attachment portion made of the flesh portion 8 is not limited to the detector cover 13.
  • the protrusion 83 has an arbitrary configuration and does not need to be provided on the motor frame 3.
  • T2 ⁇ Tave ⁇ 0.25 is satisfied with respect to the thickness t of the central portion of the portion in contact with the stator 21 fitted inside in the direction in which the shaft center 20 extends.
  • T2 ⁇ Tave ⁇ 0.25 is satisfied at least with respect to the thickness t of any portion in the direction in which the shaft center 20 extends, which is in contact with the stator 21 that is fitted inside. It's okay. Further, it is more preferable that T2 ⁇ Tave ⁇ 0.25 is satisfied for the thickness t of all parts over the entire length of the part in contact with the stator 21 fitted inside in the direction in which the shaft center 20 extends. .
  • the range that satisfies T2 ⁇ Tave ⁇ 0.25 does not have to be the thickness t of all portions in the direction in which the axis 20 extends.
  • the motor frame 3 of the first aspect includes the cylindrical main body 30 that penetrates in the direction in which the axis 20 of the rotating shaft 23 of the motor 2 that is fitted into the interior extends.
  • the cylindrical main body 30 has four outer wall surfaces 4, an inner wall surface 5, and four connecting portions 6.
  • the four outer wall surfaces 4 are arranged so as to surround the rotation axis 23 and each has a planar shape along the rotation axis 23.
  • the inner wall surface 5 surrounds the rotating shaft 23 and has a cylindrical inner surface shape along the rotating shaft 23.
  • the four connecting portions 6 are located at each of the four boundaries between adjacent outer wall surfaces 4 among the four outer wall surfaces 4.
  • Each of the four connecting portions 6 has a stress relaxation groove 7 recessed toward the axis 20 at the boundary between both adjacent outer wall surfaces 4 .
  • At least one connecting portion 6 has a stress relaxation groove 7 in a part along the direction in which the shaft center 20 extends, and has a stress relaxation groove 7 in another part along the direction in which the shaft center 20 extends. It has a flesh part 8 that is not.
  • the stress distribution applied to the stator 21 is made uniform, the shape of the stator 21 approaches a perfect circle, and the motor 2 This makes it easier to reduce the cogging torque that occurs. Further, since the flesh portion 8 is formed, it becomes easier to attach the cylindrical main body 30 to an external member.
  • At least one connecting part 6 has a mounting part, which is made of a flesh part 8 and to which a specific member is attached, at one end in the direction in which the axis 20 extends.
  • At least one connecting portion 6 further includes a protrusion 83 extending from the attachment portion toward the other end in the direction in which the axis 20 extends.
  • the projection 83 can provide a space necessary for arranging the member above the through hole 33.
  • the fourth aspect can be realized in combination with any one of the first to third aspects.
  • the thickness of the cylindrical body 30 in the inner and outer directions perpendicular to the direction in which the axis 20 extends is defined as the wall thickness
  • the minimum wall thickness of the portion having the stress relief groove 7 and the stress relief groove 7 are The minimum wall thickness of the part without is the same.
  • non-uniformity in the inner diameter of the stator core 21 is more easily alleviated.
  • the fifth aspect can be realized in combination with any one of the first to fourth aspects.
  • the inner wall surface 5 has a contact portion with the stator 21 of the motor 2 fitted therein in part or all of the direction in which the shaft center 20 extends.
  • the four connecting portions 6 have stress relaxation grooves 7 over the entire length of the portion where the contact portions are located in the direction in which the axis 20 extends.
  • non-uniformity in the inner diameter of the stator 21 is more easily alleviated.
  • the sixth aspect can be realized in combination with any one of the first to fifth aspects.
  • the cylinder in the inner and outer direction orthogonal to the direction in which the shaft center 20 extends.
  • the thickness of the shaped main body 30 is assumed to be wall thickness t (mm).
  • the angle of an arbitrary point of the cylindrical body 30 from the reference line around the axis 20 when viewed from the direction in which the axis 20 extends is defined as an angle ⁇ (rad).
  • ⁇ rad
  • T2 which is the coefficient of the quadratic term when the thickness function is expanded into a Fourier series, satisfies T2 ⁇ Tave ⁇ 0.25. Fulfill.
  • the stress applied to the stator 21 is made uniform so that the shape of the stator 21 approaches a perfect circle, making it easier to reduce the cogging torque generated in the motor 2.
  • the seventh aspect can be realized in combination with any one of the first to sixth aspects.
  • the cylindrical main body 30 has a through hole 33 formed in a portion corresponding to the outer wall surface 4, which penetrates in the inner and outer directions perpendicular to the direction in which the axis 20 extends.
  • the wiring to the motor 2 fitted inside the cylindrical body 30 can be passed from the outside of the cylindrical body 30.
  • the eighth aspect can be realized in combination with any one of the first to seventh aspects.
  • the motor device 1 includes the motor frame 3 of any one of the first to seventh aspects, and the motor 2 fitted into the cylindrical body 30 of the motor frame 3.
  • the stress applied to the stator 21 is made uniform, the shape of the stator 21 approaches a perfect circle, and the stress generated in the motor 2 is reduced. This makes it easier to reduce cogging torque. Further, since the flesh portion 8 is formed, it becomes easier to attach the cylindrical main body 30 to an external member.
  • the motor frame and motor device of the present disclosure are easy to attach to external members, and are easy to suppress the effects of non-uniformity in the circumferential direction. Therefore, the performance of the motor frame and motor device can be improved. In this way, the motor frame and motor device of the present disclosure are industrially useful.
  • Motor device 10 Reference line 2 Motor 20 Axial center 23 Rotating shaft 3 Motor frame 30 Cylindrical body 33 Through hole 4 Outer wall surface 41 First outer wall surface 42 Second outer wall surface 43 Third outer wall surface 44 Fourth outer wall surface 5 Inner wall surface 6 Connection part 61 First connection part 62 Second connection part 63 Third connection part 64 Fourth connection part 7 Stress relaxation groove 8 Flesh part 81 First flesh part 82 Second flesh part 83 Projection part 121 Position detector 122 Seal

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
PCT/JP2023/019211 2022-05-31 2023-05-23 モータフレーム及びモータ装置 Ceased WO2023234127A1 (ja)

Priority Applications (4)

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JP2024524773A JPWO2023234127A1 (https=) 2022-05-31 2023-05-23
US18/867,470 US20260018959A1 (en) 2022-05-31 2023-05-23 Motor frame and motor device
EP23815886.9A EP4535624A4 (en) 2022-05-31 2023-05-23 ENGINE CASING AND ENGINE DEVICE
CN202380042552.6A CN119256474A (zh) 2022-05-31 2023-05-23 马达框架和马达装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-089251 2022-05-31
JP2022089251 2022-05-31

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WO2023234127A1 true WO2023234127A1 (ja) 2023-12-07

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US (1) US20260018959A1 (https=)
EP (1) EP4535624A4 (https=)
JP (1) JPWO2023234127A1 (https=)
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WO (1) WO2023234127A1 (https=)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005080416A (ja) * 2003-09-01 2005-03-24 Mitsubishi Electric Corp 回転電機
JP2005269803A (ja) 2004-03-19 2005-09-29 Mitsubishi Electric Corp 永久磁石型モータ
JP2005304150A (ja) * 2004-04-09 2005-10-27 Mitsubishi Electric Corp 回転電機
JP2008228515A (ja) * 2007-03-15 2008-09-25 Mitsubishi Electric Corp 回転電機
JP2014107988A (ja) * 2012-11-28 2014-06-09 Mitsubishi Electric Corp ブラシレスモータ
JP2017184317A (ja) * 2016-03-28 2017-10-05 Ntn株式会社 電動アクチュエータ
JP2018082552A (ja) * 2016-11-16 2018-05-24 日本電産サンキョー株式会社 モータ

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5438383B2 (ja) * 2008-09-29 2014-03-12 山洋電気株式会社 モールドモータ
CN207853717U (zh) * 2017-12-20 2018-09-11 大连日牵电机有限公司 一种用于城际列车的单轴承交流异步牵引电机

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005080416A (ja) * 2003-09-01 2005-03-24 Mitsubishi Electric Corp 回転電機
JP2005269803A (ja) 2004-03-19 2005-09-29 Mitsubishi Electric Corp 永久磁石型モータ
JP2005304150A (ja) * 2004-04-09 2005-10-27 Mitsubishi Electric Corp 回転電機
JP2008228515A (ja) * 2007-03-15 2008-09-25 Mitsubishi Electric Corp 回転電機
JP2014107988A (ja) * 2012-11-28 2014-06-09 Mitsubishi Electric Corp ブラシレスモータ
JP2017184317A (ja) * 2016-03-28 2017-10-05 Ntn株式会社 電動アクチュエータ
JP2018082552A (ja) * 2016-11-16 2018-05-24 日本電産サンキョー株式会社 モータ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4535624A4

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EP4535624A1 (en) 2025-04-09
US20260018959A1 (en) 2026-01-15
EP4535624A4 (en) 2025-10-08
CN119256474A (zh) 2025-01-03

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