WO2022124073A1 - ダイレクトドライブモータ - Google Patents
ダイレクトドライブモータ Download PDFInfo
- Publication number
- WO2022124073A1 WO2022124073A1 PCT/JP2021/042967 JP2021042967W WO2022124073A1 WO 2022124073 A1 WO2022124073 A1 WO 2022124073A1 JP 2021042967 W JP2021042967 W JP 2021042967W WO 2022124073 A1 WO2022124073 A1 WO 2022124073A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- main body
- output shaft
- drive motor
- direct drive
- end surface
- Prior art date
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- 230000002093 peripheral effect Effects 0.000 claims description 83
- 230000001105 regulatory effect Effects 0.000 claims description 33
- 238000005096 rolling process Methods 0.000 claims description 33
- 230000004323 axial length Effects 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/063—Fixing them on the shaft
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/067—Fixing them in a housing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/07—Fixing them on the shaft or housing with interposition of an element
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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
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
Definitions
- This disclosure relates to a direct drive motor.
- a direct drive motor is an electric motor that directly transmits the generated power to an object without going through a deceleration mechanism.
- the object include a table on which the work is placed, an arm for gripping the work, and the like.
- the direct drive motor of Patent Document 1 below includes an annular base fastened to a base by fasteners, a fixed shaft fitted to the inner peripheral surface of the base, a bearing fitted to the outer peripheral side of the fixed shaft, and a bearing. It includes a connecting member that fits on the outer peripheral side, an output shaft that fits on the connecting member, and a motor unit that applies torque to the output shaft.
- the fixed shaft is fixed to the base via the base. Further, the output shaft is supported by the fixed shaft via the connecting member. According to such a structure, the rigidity for supporting the fixed shaft and the output shaft may be low. Then, when the output shaft is rotated, the output shaft vibrates in the radial direction, that is, so-called runout is likely to occur.
- the present disclosure has been made in view of the above, and an object of the present disclosure is to provide a direct drive motor capable of suppressing runout of an output shaft.
- the direct drive motor includes a cylindrical fixed shaft, a bearing portion in which an inner ring fits on the outer peripheral surface of the fixed shaft, and an outer ring of the bearing portion.
- the cylindrical output shaft fitted to the peripheral surface, the first regulating member arranged in the first direction of the axial direction parallel to the axis of the output shaft with respect to the inner ring, and the first regulating member with respect to the outer ring. It includes a second regulating member arranged in one direction and a motor unit that applies torque to the output shaft.
- the fixed shaft extends from a cylindrical first main body to which the inner ring fits and a second direction opposite to the first direction from the first main body, and an end face of the inner ring in the second direction.
- a cylindrical first contact portion that abuts on the surface, a base contact portion that extends in the second direction from the first contact portion, and an end face in the second direction abuts on the base, and the base contact portion. It has a first female screw hole provided on the end surface of the second direction and into which a first fastener for fastening the base contact portion and the base is screwed.
- the output shaft has a cylindrical second main body to which the outer ring fits, and a tubular second body that is located in the second direction from the second main body and abuts on the end face of the outer ring in the second direction.
- Two abutting portions and a cylindrical mounting portion extending in the first direction from the outer peripheral portion of the second main body portion and having an end surface in the first direction protruding in the first direction from the second regulating member. It has a second female screw hole provided on the end surface of the mounting portion in the first direction and into which a second fastener for fastening the mounting portion and an object is screwed.
- the first restricting member is fastened to the end face of the first main body portion in the first direction and abuts on the end face of the inner ring in the first direction.
- the second regulating member is fastened to the end face of the second main body portion in the first direction and abuts on the end face of the outer ring in the first direction.
- the direct drive motor of the present disclosure there are no parts intervening between the base and the fixed shaft, parts intervening between the fixed shaft and the bearing portion, and parts intervening between the bearing portion and the output shaft. ..
- the fixed shaft is fastened to a first fastener that is screwed into the first female screw hole. Therefore, the fixed shaft is directly supported by the base.
- the inner ring is fitted to the first main body portion of the fixed shaft. Therefore, the bearing portion is directly supported by the fixed shaft.
- the output shaft has a second main body that fits into the outer ring of the bearing. Therefore, the output shaft is directly supported by the bearing portion. From the above, the rigidity to support the output shaft is high.
- the output shaft when the output shaft is rotated, the runout of the output shaft is suppressed.
- the output shaft may be eccentric with respect to the fixed shaft due to the influence of assembly tolerances, in other words, the workpiece may not be conveyed accurately. ..
- the only component interposed between the fixed shaft and the output shaft is the bearing portion. Therefore, the influence of the assembly tolerance is small, and the concentricity of the output shaft with respect to the fixed shaft is high. Therefore, the work can be conveyed with high accuracy.
- the bearing portion abuts on the first contact portion of the fixed shaft and is positioned in the axial direction.
- the output shaft is positioned in the axial direction with the second contact portion abutting on the bearing portion. Therefore, regarding the axial positioning of the output shaft with respect to the fixed shaft, the only component interposed between the fixed shaft and the output shaft is the bearing portion. Therefore, the influence of the assembly tolerance is small, and the position (height) of the object fixed to the output shaft can be set to the desired position (height). For this reason, the work can be conveyed with high accuracy.
- the first regulating member and the second regulating member are in contact with the inner ring or the outer ring. Therefore, it is suppressed that the output shaft moves in the axial direction and the position of the object changes.
- the motor unit has a rotor fitted to the outer peripheral surface of the output shaft and a stator surrounding the outer peripheral side of the rotor.
- a stator support portion extending radially outward from the base contact portion to support the stator is fastened to the outer peripheral side of the base contact portion.
- the stator may vibrate due to the magnetic attraction and magnetic repulsion generated between it and the rotor. Further, when the fixed shaft supports the stator, the vibration of the stator is transmitted to the fixed shaft, and the output shaft may be shaken.
- the stator is supported by a stator support portion fastened to a fixed shaft. Therefore, when the stator vibrates, it is absorbed by the stator support portion, and it is difficult for the vibration to be transmitted to the fixed shaft. Therefore, it is possible to avoid the occurrence of vibration in the output shaft due to the vibration of the stator.
- the inner shape and the outer shape of the second main body portion have a circular shape centered on the shaft.
- the outer peripheral surface of the output shaft may be milled.
- internal stress is generated in the rotating shaft, and the inner peripheral surface of the rotating shaft is distorted.
- the inner peripheral surface of the rotating shaft becomes non-circular, the tightening force on the outer ring due to fitting is not uniform in the circumferential direction of the outer ring, which causes runout in the output shaft.
- the inner shape and the outer shape of the second main body portion have a circular shape. Therefore, the tightening force on the outer ring due to the fitting acts uniformly in the circumferential direction of the outer ring. Therefore, when the output shaft is rotated, the runout of the output shaft is suppressed.
- the inner shape and the outer shape of the first main body portion have a circular shape centered on the shaft.
- the tightening force on the inner ring due to the fitting of the first main body portion acts uniformly in the circumferential direction of the inner ring. Therefore, the runout of the bearing portion with respect to the fixed shaft is suppressed. Further, the runout of the output shaft supported by the bearing portion is also suppressed.
- the first female screw hole is arranged radially inside the rolling surface of the inner ring.
- the second female screw hole is arranged radially outside the rolling surface of the outer ring.
- the fixed shaft When the first fastener is screwed into the first female screw hole, the fixed shaft is deformed so that the hole diameter of the first female screw hole becomes large. If the first female screw hole overlaps the rolling surface of the inner ring in the axial direction, the rolling surface of the inner ring is distorted and the rolling element does not rotate smoothly.
- the first female screw hole of the present disclosure is arranged and separated in the radial direction from the rolling surface of the inner ring. Therefore, the rolling surface of the inner ring is not easily deformed.
- the second female screw hole is separated from the rolling surface of the outer ring. Therefore, the rolling surface of the outer ring is not easily deformed. From the above, the rolling element smoothly rolls on the rolling surface, and the output shaft smoothly rotates.
- the runout of the output shaft is suppressed when the output shaft is rotated, and the work can be stably conveyed.
- FIG. 1 is a cross-sectional view schematically showing an example of the overall configuration of the direct drive motor of the first embodiment.
- FIG. 2 is an enlarged cross-sectional view of a part of the direct drive motor of FIG.
- FIG. 3 is a bottom view of the direct drive motor of the first embodiment as viewed from the second direction.
- FIG. 4 is a plan view of the direct drive motor of the first embodiment as viewed from the first direction.
- FIG. 1 is a cross-sectional view schematically showing an example of the overall configuration of the direct drive motor of the first embodiment.
- FIG. 2 is an enlarged cross-sectional view of a part of the direct drive motor of FIG.
- FIG. 3 is a bottom view of the direct drive motor of the first embodiment as viewed from the second direction.
- FIG. 4 is a plan view of the direct drive motor of the first embodiment as viewed from the first direction.
- the direct drive motor 100 of the first embodiment is an electric motor that generates power for conveying a work (not shown).
- the base 110 is arranged on one side of the shaft AX of the output shaft 3.
- the direct drive motor 100 is fixed to the base 110.
- the table 120 is arranged on the other side of the shaft AX of the output shaft 3.
- the table 120 is attached to the direct drive motor 100. and.
- the direct drive motor 100 rotates the table 120 around the shaft AX and conveys a work (not shown) placed on the table 120.
- the direct drive motor 100 of the embodiment gives an example in which the table 120 is attached as an object
- the direct drive motor of the present disclosure is not limited to this.
- the direct drive motor of the present disclosure may be used as a servomotor used as a drive source for driving an arm.
- the direct drive motor of the present disclosure may be used for inspection equipment, machine tools, semiconductor manufacturing equipment, and the like.
- the direct drive motor 100 includes a fixed shaft 1, a bearing portion 2, an output shaft 3, a first regulating member 4, a second regulating member 5, a first cover member 6, a stator support member 7, and a motor portion. 8 and a second cover member 9 are provided.
- the direction parallel to the axis AX is referred to as an axial direction.
- the direction in which the table 120 is arranged when viewed from the direct drive motor 100 is referred to as the first direction A1.
- the direction in which the base 110 is arranged when viewed from the direct drive motor 100 is called the second direction A2.
- the fixed shaft 1 is a cylindrical part whose center extends in the axial direction. As shown in FIG. 2, the fixed shaft 1 has a first main body portion 10 in which the inner rings 25 and 26 of the bearing portion 2 are fitted on the outer peripheral surface, and a first main body portion 10 extending from the first main body portion 10 in the second direction A2. A contact portion 11, a base contact portion 12 extending from the first contact portion 11 in the second direction A2, and a protruding portion 13 protruding from the first main body portion 10 in the first direction are provided. That is, the fixed shaft 1 is a component in which the first main body portion 10, the first contact portion 11, the base contact portion 12, and the projecting portion 13 are integrally formed. In addition, in FIG. 2, an auxiliary line (dashed-dotted line) is provided in order to clarify each part of the first main body portion 10, the first contact portion 11, the base contact portion 12, and the protrusion portion 13. I'm pulling.
- the first main body portion 10 has a cylindrical shape centered on the axis AX. That is, when viewed from the axis AX direction, the outer peripheral surface 10a and the inner peripheral surface 10b of the first main body portion 10 have a circular shape centered on the axis AX (see FIG. 3).
- the axial length of the first main body portion 10 is the same as the axial length of the bearing portion 2.
- a plurality of female screw holes 10d arranged at equal intervals in the circumferential direction are provided on the end surface 10c of the first main body portion 10 in the first direction A1.
- the thickness of the first main body portion 10 from the outer peripheral surface 10a to the inner peripheral surface 10b is T1 (see FIG. 1).
- the outer diameter of the first contact portion 11 is larger than the outer diameter of the first main body portion 10. That is, the first contact portion 11 projects radially outward from the outer peripheral surface 10a of the first main body portion 10.
- the end surface 11a of the first direction A1 of the first contact portion 11 is in contact with the end surface 26a of the inner ring 26 of the bearing portion 2 in the second direction A2.
- the base contact portion 12 has a large diameter portion 14 having an outer diameter larger than the outer diameter of the first contact portion 11, and a second direction A2 from the end surface 14a of the second direction A2 of the large diameter portion 14. It is provided with a protrusion 15 protruding from the surface.
- a hole 14c is provided on the end surface 14a of the large diameter portion 14 in the second direction A2.
- the protrusion 15 forms an annular shape when viewed from the axial direction.
- the end surface 15a of the protrusion 15 in the second direction A2 is a flat surface.
- the end surface 15a of the protrusion 15 in the second direction A2 is in contact with the surface (mounting surface) of the base 110 facing the first direction A1.
- a first female screw hole 15b is provided on the end surface 15a of the protrusion 15 in the second direction A2.
- a plurality of first female screw holes 15b are provided at equal intervals in the circumferential direction (see FIG. 3).
- a first fastener 201 penetrating the base 110 is screwed into the first female screw hole 15b.
- the protrusion 15 base contact portion 12
- the fixed shaft 1 is fixed to the base 110.
- end surface 15a of the second direction A2 of the protrusion 15 is located in the second direction A2 from the first cover 6 and the stator support member 7. That is, the 6 from the first cover and the stator support member 7 do not abut on the base 110.
- the protruding portion 13 protrudes from the inner peripheral side of the end surface 10c of the first direction A1 of the first main body portion 10 in the first direction A1.
- the outer peripheral surface of the protrusion 13 has a circular shape when viewed from the axial direction.
- the bearing portion 2 includes a first bearing 21 and a second bearing 22 arranged in the second direction A2 with respect to the first bearing 21.
- the first bearing 21 and the second bearing 22 are back-combined angular contact ball bearings.
- the first bearing includes an outer ring 23, an inner ring 25, and a plurality of rolling elements 27 arranged between the outer ring 23 and the inner ring 25.
- the second bearing includes an outer ring 24, an inner ring 26, and a plurality of rolling elements 28 arranged between the outer ring 24 and the inner ring 26.
- the rolling surfaces of the inner rings 25 and 26 are located radially outside the first female screw hole 15b of the fixed shaft 1 (see the virtual line L in FIG. 2).
- the first female screw hole 15b of the fixed shaft 1 is located radially inside the rolling surfaces of the inner rings 25 and 26. That is, the first female screw hole 15b and the rolling surfaces of the inner rings 25 and 26 do not overlap in the axial direction.
- the output shaft 3 is a cylindrical part.
- the output shaft 3 has a cylindrical second main body portion 30 that fits into the outer rings 23 and 24, a second contact portion 31 that extends from the second main body portion 30 in the second direction A2, and a second main body portion 30.
- a cylindrical mounting portion 32 extending from the outer peripheral portion of the above in the first direction A1 is provided. That is, the output shaft 3 is a cylindrical part.
- the output shaft 3 is a component in which a second main body portion 30, a second contact portion 31, and a cylindrical mounting portion 32 are integrally formed.
- the second main body portion 30 has a cylindrical shape centered on the shaft AX. That is, when viewed from the axial direction, the outer peripheral surface 30a and the inner peripheral surface 30b of the second main body portion 30 form a circular shape centered on the axis AX (see FIG. 4). As shown in FIG. 2, the axial length of the second main body portion 30 is the same as the axial length of the bearing portion 2.
- a plurality of female screw holes 30d arranged at equal intervals in the circumferential direction are provided on the end surface 30c of the first direction A1 of the second main body portion 30.
- the outer peripheral surface 30a of the second main body portion 30 is provided with an annular projecting portion 30e that projects radially outward from the end of the first direction A1.
- the protrusion 30e is positioned in the axial direction of the rotor 81.
- the thickness of the second main body portion 30 from the outer peripheral surface 30a to the inner peripheral surface 30b is T2 (see FIG. 1).
- the inner diameter of the second contact portion 31 is smaller than the inner diameter of the second main body portion 30. That is, the second contact portion 31 projects radially inward from the inner peripheral surface 30b of the second main body portion 30.
- the end surface 31a of the first direction A1 of the second contact portion 31 is in contact with the end surface 24a of the outer ring 24 in the second direction A2.
- the mounting portion 32 has an annular shape when viewed from the axial direction.
- the end surface 32a of the mounting portion 32 in the first direction A1 is a contact surface that abuts on the table 120.
- the mounting portion 32 protrudes from the second regulating member 5 in the first direction A1. That is, the end surface 32a of the first direction A1 of the mounting portion 32 is located in the first direction A1 with respect to the second regulating member 5.
- the end surface 32a of the mounting portion 32 is a flat surface.
- the end surface 32a of the mounting portion 32 is provided with a second female screw hole 32b into which the second fastener 202 is screwed.
- a plurality of second female screw holes 32b are provided at equal intervals in the circumferential direction. Further, the second female screw hole 32b is arranged radially outside the rolling surface of the outer rings 23 and 24, and does not overlap with the outer rings 23 and 24 in the axial direction.
- the table 120 is brought into contact with the end surface 32a of the mounting portion 32 from the first direction A1.
- the second fastener 202 penetrating the table 120 is screwed into the second female screw hole 32b.
- the table 120 is fixed to the output shaft 3.
- the first regulating member 4 is an annular part.
- the first regulating member 4 is arranged in the first direction A1 of the inner ring 25 and the first main body portion 10.
- the first regulating member 4 is fastened to the fastener 203.
- the first regulating member 4 is in contact with the end surface 25a of the inner ring 25 in the first direction A1.
- the bearing portion 2 is restricted from moving in the first direction A1 with respect to the fixed shaft 1.
- the inner diameter of the first regulating member 4 is the same as the outer diameter of the protruding portion 13. That is, the entire circumference of the inner peripheral surface 4a of the first regulating member 4 is in contact with the outer peripheral surface of the protruding portion 13. This prevents the first regulating member 4 from moving in the radial direction and the first regulating member 4 coming into contact with the second regulating member 5.
- the second restricting member 5 includes a fastened portion 50 fastened to the fastener 204, a covering portion 51 extending radially inward from the fastened portion 50, and an inner peripheral end of the covering portion 51.
- a cylindrical portion 53 extending from the second direction A2 is provided.
- the fastened portion 50 is arranged in the first direction A1 of the outer ring 23 and the second main body portion 30.
- the fastened portion 50 is fastened to the fastener 204.
- the fastened portion 50 is in contact with the end surface 23a of the outer ring 23 in the first direction A1.
- the output shaft 3 is restricted from moving in the first direction A1 with respect to the bearing portion 2.
- the outer diameter of the fastened portion 50 is the same as the inner diameter of the mounting portion 32. That is, the entire circumference of the outer peripheral surface 50a of the fastened portion 50 is in contact with the inner peripheral surface of the mounting portion 32. As a result, it is avoided that the second regulating member 5 moves in the radial direction and the fastened portion 50 comes into contact with the first regulating member 4.
- the covering portion 51 extends radially inward from the fastened portion 50.
- the radial inner end of the covering portion 51 is located radially inside the inner peripheral surface 10b of the first main body portion 10.
- the covering portion 51 covers the first direction A1 between the fastened portion 50 and the first regulating member 4, the first regulating member 4, and the protruding portion 13. As a result, even if the lubricating oil leaks from the bearing portion 2 between the fastened portion 50 and the first regulating member 4, the lubricating oil does not flow out beyond the covering portion 51 toward the first direction A1.
- the outer peripheral surface 52a of the cylindrical portion 52 faces the inner peripheral surface 1a of the fixed shaft 1.
- the outer peripheral surface 52a of the cylindrical portion 52 and the inner peripheral surface 1a of the fixed shaft 1 are separated in the radial direction. Therefore, an annular space S capable of accommodating a sensor or the like is provided between the cylindrical portion 52 and the fixed shaft 1.
- the first cover member 6 is a component that is arranged on the inner peripheral side of the protrusion 15 and closes the second direction A2 of the annular space S.
- the first cover member 6 is a flat plate-shaped component having an annular shape centered on the shaft AX and having a thin axial thickness.
- the outer peripheral portion of the first cover member 6 is overlapped with the end surface 14a of the large diameter portion 14.
- the outer peripheral portion of the first cover member 6 is fastened to the fastener 205 screwed into the outer peripheral female screw hole 14b. As a result, the first cover member 6 is supported by the fixed shaft 1.
- the stator support member 7 is a component arranged on the outer peripheral side of the protrusion 15.
- the stator support member 7 has a ring-shaped ring portion 70 and a cylindrical stator mounting portion 71 projecting from the outer peripheral portion of the ring portion 70 in the first direction A1.
- the inner peripheral portion of the ring portion 70 is overlapped with the end surface 14a of the large diameter portion 14.
- the inner peripheral portion of the ring portion 70 is fastened to the fastener 206 screwed into the inner peripheral female screw hole 14c.
- the stator support member 7 is supported by the fixed shaft 1.
- the stator mounting portion 71 is provided with a plurality of female screw holes 72 in the circumferential direction on the end surface of the first direction A1.
- the thickness of the stator mounting portion 71 from the outer peripheral surface to the inner peripheral surface is T3 (see FIG. 1). Further, the thickness of the ring portion 70 in the axial direction is T4 (see FIG. 1).
- the motor unit 8 has a stator 80 and a rotor 81.
- the rotor 81 includes an annular core fitted on the outer peripheral surface of the second main body 30 of the output shaft 3, and a plurality of permanent magnets (not shown) embedded in the core and arranged at equal intervals in the circumferential direction.
- the stator 80 includes a cylindrical holder 82, a plurality of cores 83 arranged at equal intervals in the circumferential direction along the inner peripheral surface of the holder 82, a bobbin 84 supported by each core 83, and a bobbin 84.
- a coil 85 in which a wire is wound multiple times is provided.
- the holder 82 is arranged in the first direction A1 of the stator mounting portion 71.
- the holder 82 is provided with a plurality of holes 82a penetrating in the axial direction. Then, the shaft portion of the fastener 207 penetrates the hole portion 82a of the holder 82 and is screwed into the female screw hole 72 of the stator mounting portion 71 (see the figure on the left side of the shaft AX in FIG. 1). As a result, the stator 80 is supported by the stator support member 7.
- the female screw holes 72 of the stator mounting portion 71 and the plurality of hole portions 82a of the holder 82 are partially for the fastener 208 for fastening the second cover member 9 (more than the shaft AX in FIG. 1). See the figure on the right).
- the second cover member 9 is an annular part.
- the cross-sectional shape of the second cover member 9 cut outward in the radial direction from the shaft AX has a substantially L-shape that covers the first direction A1 of the stator 80 and the outer peripheral side of the stator 80.
- the second cover member 9 is fastened to the fastener 208 and is supported by the stator support member 7. Further, a spacer 90 is interposed between the second cover member 9 and the holder 82.
- the direct drive motor 100 of the first embodiment a component interposed between the base 110 and the fixed shaft 1, a component interposed between the fixed shaft 1 and the bearing portion 2, and a component between the bearing portion 2 and the output shaft 3 There are no intervening parts. That is, the protrusion 15 (base contact portion 12) of the fixed shaft 1 and the base 110 are fastened by the first fastener 201. The protrusion 15 (base contact portion 12) of the fixed shaft 1 is in contact with the base 110. Therefore, the fixed shaft 1 is directly supported by the base 110. Further, in the bearing portion 2, the inner rings 25 and 26 are fitted to the first main body portion 10 of the fixed shaft 1.
- the bearing portion 2 is directly supported by the fixed shaft 1. Further, in the output shaft 3, the outer rings 23 and 24 of the bearing portion 2 are fitted to the second main body portion 30. Therefore, the output shaft 3 is directly supported by the bearing portion 2. From the above, the rigidity that supports the output shaft 3 is high. Therefore, when the output shaft 3 is rotated, the runout of the output shaft 3 is suppressed. Further, the table 120 is fastened to the output shaft 3 by the second fastener 202. Therefore, the output shaft 3 directly supports the table 120. From the above, the rigidity that supports the table 120 is high. Therefore, when the direct drive motor 100 is driven, the runout of the table 120 is suppressed.
- stator 80 may vibrate due to the magnetic attraction force and the magnetic repulsion force generated between the stator 80 and the rotor 81. If the fixed shaft 1 directly supports the stator 80, the vibration of the stator 80 may be transmitted to the fixed shaft 1 and the output shaft 3 may be shaken. However, the stator 80 of the first embodiment is indirectly supported by the fixed shaft 1 via the stator support member 7. Therefore, the vibration of the stator 80 is absorbed by the stator support member 7 and is difficult to be transmitted to the fixed shaft 1. From the above, it is suppressed that the output shaft 3 is shaken due to the vibration of the stator 80.
- the outer peripheral surface of the output shaft 3 may be cut by milling or the like so that the cross section has a D shape.
- internal stress is generated in the output shaft 3, and the inner peripheral surface of the output shaft 3 is distorted.
- the tightening force of the fitting of the output shaft 3 is not uniform in the circumferential direction and causes runout.
- the outer peripheral surface 30a and the inner peripheral surface 30b of the second main body portion 30 of the first embodiment have a circular shape when viewed from the axial direction.
- the outer peripheral surface 30a of the second main body 30 is not milled or the like, and the tightening force of the inner peripheral surface 30b of the second main body 30 acts uniformly in the circumferential direction. Therefore, when the output shaft 3 is rotated, the runout of the output shaft 3 is suppressed.
- the outer peripheral surface 10a and the inner peripheral surface 10b of the first main body portion 10 of the first embodiment have a circular shape when viewed from the axial direction. Therefore, the first main body portion 10 is not milled or otherwise processed, and no internal stress is applied.
- the tightening force of the outer peripheral surface 10a of the first main body portion 10 acts uniformly in the circumferential direction. Therefore, the runout of the bearing portion 2 with respect to the fixed shaft 1 is suppressed, and by extension, the runout of the output shaft 3 supported by the bearing portion 2 is suppressed.
- the only component interposed between the fixed shaft 1 and the output shaft 3 is the bearing portion 2. If the number of parts interposed between the fixed shaft 1 and the output shaft 3 increases, the output shaft 3 may be eccentric with respect to the fixed shaft 1 due to the influence of the assembly tolerance. That is, according to the direct drive motor 100 of the first embodiment, the influence of the assembly tolerance is small, and the concentricity of the output shaft 3 with respect to the fixed shaft 1 is high. Therefore, the work can be conveyed with high accuracy.
- the bearing portion 2 abuts on the end surface 11a of the first contact portion 11 of the fixed shaft 1 and is positioned in the axial direction.
- the output shaft 3 is positioned in the axial direction when the end surface 31a of the second contact portion 31 abuts on the bearing portion 2. Therefore, regarding the axial positioning of the output shaft 3 with respect to the fixed shaft 1, the bearing portion 2 is the only component interposed between the fixed shaft 1 and the output shaft 3. Therefore, the influence of assembly tolerance is small. Therefore, the end surface 32a of the mounting portion 32 of the output shaft 3 is at a desired position (height), and the work can be conveyed with high accuracy. Further, no other parts are interposed between the base 110 and the fixed shaft 1, and between the output shaft 3 and the table 120. For this reason as well, the influence of the assembly tolerance is small, and the work can be conveyed with high accuracy.
- the hole diameter of the female screw hole is deformed to be large. If the first female screw hole 15b overlaps the rolling surface of the inner rings 25 and 26 in the axial direction, the first female screw hole 15b and the inner rings 25 and 26 are relatively close to each other. Therefore, when the first fastener 201 is screwed into the first female screw hole 15b, the rolling surfaces of the inner rings 25 and 26 may be distorted, and the rolling elements 27 and 28 may not rotate smoothly.
- the first female screw hole 15b of the fixed shaft 1 of the first embodiment is arranged and separated in the radial direction from the rolling surface of the inner rings 25 and 26. Therefore, the rolling surfaces of the inner rings 25 and 26 are not deformed.
- the second female screw hole 32b is arranged radially outside the rolling surface of the outer rings 23 and 24, and is separated from the rolling surface of the inner rings 25 and 26. Therefore, the rolling surfaces of the inner rings 25 and 26 are not deformed. From the above, the rolling elements 27 and 28 roll smoothly, and the output shaft 3 smoothly rotates.
- the radial thickness T1 of the first main body portion 10, the radial thickness T2 of the second main body portion 20, the axial thickness T3 of the ring portion 70, and the radial thickness T4 of the stator mounting portion 71 are thicknesses. In descending order of, T1> T2> T4> T3. Further, the radial thickness T1 of the first main body portion 10 is larger than the radial length (thickness) of the bearing portion 2. Therefore, the rigidity of the first main body portion 10 is improved. Therefore, the rigidity for supporting the output shaft 3 is high, and the runout of the output shaft 3 is suppressed.
- the first fastener 201 and the like are screwed to the fixed shaft 1 having the first main body portion 10, the deformation of the fixed shaft 1 is suppressed.
- the radial thickness T2 of the second main body portion 20 is larger than the radial length (thickness) of the bearing portion 2. Therefore, although the fastener 204 or the like is screwed into the output shaft 3 having the second main body portion 30, the deformation of the output shaft 3 is suppressed.
- the second main body portion 30 is larger than the thickness T3 of the ring portion 70 and the thickness T4 of the stator mounting portion 71, respectively.
- the cylindrical fixed shaft 1, the bearing portion 2 in which the inner rings 25 and 26 are fitted to the outer peripheral surface of the fixed shaft 1, and the outer rings 23 and 24 of the bearing portion 2 are inside.
- a second regulating member 5 arranged in the first direction A1 and a motor unit 8 for applying a torque to the output shaft 3 are provided with respect to the 23 and 24.
- the fixed shaft 1 extends from the first main body portion 10 having a cylindrical shape fitted to the inner rings 25 and 26 and the second main body portion 10 to the second direction A2 opposite to the first direction A1 and extends in the second direction of the inner ring 26.
- a cylindrical first contact portion 11 that abuts on the end surface 26a of A2, and a base contact portion that extends from the first contact portion 11 in the second direction A2 and the end surface 15a of the second direction A2 abuts on the base 110.
- a first female screw hole 15b provided on the end surface 15a of the second direction A2 of the base contact portion 12 and into which the first fastener 201 for fastening the base contact portion 12 and the base 110 is screwed. Have.
- the output shaft 3 is located in the second main body portion 30 having a cylindrical shape fitted to the outer rings 23 and 24, and in the second direction A2 from the second main body portion 30, and abuts on the end surface 24a of the outer ring 24 in the second direction A2.
- the cylindrical second contact portion 31 and the outer peripheral portion of the second main body portion 30 extend in the first direction A1, and the end surface 32a of the first direction A1 protrudes in the first direction A1 from the second regulating member 5.
- a second fastener 202 which is provided on the cylindrical mounting portion 32 and the end surface 32a of the mounting portion 32 in the first direction A1 and for fastening the mounting portion 32 and the object (table 120), is screwed. It has a female screw hole 32b.
- the first regulating member 4 is fastened to the end surface 10c of the first direction A1 of the first main body portion 10 and abuts on the end surface 25a of the inner ring 25 in the first direction A1.
- the second regulating member 5 is fastened to the end surface 30c of the first direction A1 of the second main body portion 30 and abuts on the end surface 23a of the outer ring 23 in the first direction A1.
- the rigidity for supporting the output shaft 3 is high, and the runout of the output shaft 3 can be suppressed.
- the only component interposed between the fixed shaft 1 and the output shaft 3 is the bearing portion 2, which is less affected by the assembly tolerance. Therefore, the concentricity of the output shaft 3 with respect to the fixed shaft 1 is high. Further, the end surface 32a of the mounting portion 32 of the output shaft 3 is at a desired position (height). Therefore, the work can be conveyed with high accuracy.
- the motor unit 8 of the direct drive motor 100 of the first embodiment has a rotor 81 fitted to the outer peripheral surface of the output shaft 3 and a stator 80 surrounding the outer peripheral side of the rotor 81.
- a stator support member 7 extending radially outward from the base contact portion 12 to support the stator 80 is fastened to the outer peripheral side of the base contact portion 12.
- the inner shape and the outer shape of the second main body portion 30 have a circular shape centered on the shaft AX.
- the tightening force of the inner peripheral surface 30b of the second main body portion 30 with respect to the bearing portion 2 acts uniformly in the circumferential direction. Therefore, the runout of the output shaft 3 can be suppressed.
- the inner shape and the outer shape of the first main body portion 10 have a circular shape centered on the shaft AX.
- the tightening force of the outer peripheral surface 10a of the first main body portion 10 with respect to the bearing portion 2 acts uniformly in the circumferential direction. Therefore, the runout of the output shaft 3 can be suppressed.
- the first female screw hole 15b is arranged radially inside the rolling surfaces of the inner rings 25 and 26.
- the second female screw hole 32b is arranged radially outside the rolling surface of the outer rings 23 and 24.
- the bearing portion 2 includes two bearings, but may be composed of one or three or more bearings.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Motor Or Generator Frames (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
Description
1 固定軸
2 軸受部
3 出力軸
4 第1規制部材
5 第2規制部材
6 第1カバー部材
7 ステータ支持部材
8 モータ部
9 第2カバー部材
10 第1本体部
11 第1当接部
12 土台当接部
13 突出部
14 大径部
15 突起部
15b 第1雌ねじ穴
30 第2本体部
31 第2当接部
32 取付部
32b 第2雌ねじ穴
110 土台
120 テーブル
Claims (5)
- 筒状の固定軸と、
内輪が前記固定軸の外周面に嵌合する軸受部と、
前記軸受部の外輪が内周面に嵌合する筒状の出力軸と、
前記内輪に対し、前記出力軸の軸と平行な軸方向のうち第1方向に配置される第1規制部材と、
前記外輪に対し、前記第1方向に配置される第2規制部材と、
前記出力軸にトルクを付与するモータ部と、
を備え、
前記固定軸は、
前記内輪が嵌合する筒状の第1本体部と、
前記第1本体部から前記第1方向と反対の第2方向に延出し、かつ前記内輪の前記第2方向の端面に当接する筒状の第1当接部と、
前記第1当接部から前記第2方向に延出し、前記第2方向の端面が土台と当接する土台当接部と、
前記土台当接部の前記第2方向の端面に設けられ、前記土台当接部と前記土台とを締結するための第1締結具が螺合する第1雌ねじ穴と、
を有し、
前記出力軸は、
前記外輪が嵌合する筒状の第2本体部と、
前記第2本体部から前記第2方向に位置し、前記外輪の前記第2方向の端面に当接する筒状の第2当接部と、
前記第2本体部の外周部から前記第1方向に延出し、前記第1方向の端面が前記第2規制部材よりも前記第1方向に突出する筒状の取付部と、
前記取付部の前記第1方向の端面に設けられ、前記取付部と対象物とを締結するための第2締結具が螺合する第2雌ねじ穴と、
を有し、
前記第1規制部材は、前記第1本体部の前記第1方向の端面に締結され、かつ前記内輪の前記第1方向の端面に当接し、
前記第2規制部材は、前記第2本体部の前記第1方向の端面に締結され、かつ前記外輪の前記第1方向の端面に当接する
ダイレクトドライブモータ。 - 前記モータ部は、
前記出力軸の外周面に嵌合するロータと、
前記ロータの外周側を囲むステータと、
を有し、
前記土台当接部の外周側には、前記土台当接部から径方向外側に延びて前記ステータを支持するステータ支持部が締結される
請求項1に記載のダイレクトドライブモータ。 - 前記出力軸の内形及び外形は、前記軸を中心とする円形状を成している
請求項1又は請求項2に記載のダイレクトドライブモータ。 - 前記固定軸の内形及び外形は、前記軸を中心とする円形状を成している
請求項1から請求項3のいずれか1項に記載のダイレクトドライブモータ。 - 前記第1雌ねじ穴は、前記内輪の転動面よりも径方向内側に配置され、
前記第2雌ねじ穴は、前記外輪の転動面よりも径方向外側に配置される
請求項1から請求項4のいずれか1項に記載のダイレクトドライブモータ。
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JP2022568168A JPWO2022124073A1 (ja) | 2020-12-07 | 2021-11-24 | |
CN202180081045.4A CN116547461A (zh) | 2020-12-07 | 2021-11-24 | 直接驱动马达 |
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JP2020-202703 | 2020-12-07 |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000217298A (ja) * | 1999-01-20 | 2000-08-04 | Nsk Ltd | スピンドルモ―タとこのスピンドルモ―タを組み込んだハ―ドディスクドライブ装置 |
JP2002125345A (ja) * | 2000-10-13 | 2002-04-26 | Nsk Ltd | 小型精密モータ |
JP2002343015A (ja) * | 2001-05-15 | 2002-11-29 | Nsk Ltd | ディスクドライブ装置 |
JP2003299299A (ja) * | 2002-04-02 | 2003-10-17 | Nsk Ltd | ダイレクトドライブモータのロータ支持構造 |
-
2021
- 2021-11-24 WO PCT/JP2021/042967 patent/WO2022124073A1/ja active Application Filing
- 2021-11-24 CN CN202180081045.4A patent/CN116547461A/zh active Pending
- 2021-11-24 JP JP2022568168A patent/JPWO2022124073A1/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000217298A (ja) * | 1999-01-20 | 2000-08-04 | Nsk Ltd | スピンドルモ―タとこのスピンドルモ―タを組み込んだハ―ドディスクドライブ装置 |
JP2002125345A (ja) * | 2000-10-13 | 2002-04-26 | Nsk Ltd | 小型精密モータ |
JP2002343015A (ja) * | 2001-05-15 | 2002-11-29 | Nsk Ltd | ディスクドライブ装置 |
JP2003299299A (ja) * | 2002-04-02 | 2003-10-17 | Nsk Ltd | ダイレクトドライブモータのロータ支持構造 |
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CN116547461A (zh) | 2023-08-04 |
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