JP2023018722A - motor - Google Patents

Abstract

To provide a motor capable of significantly suppressing vibration and abnormal noise while rotating.SOLUTION: A motor includes: a rotatable shaft; a first rotating member fixed on one side in the axial direction of the shaft, a second rotating member fixed on the other side in the axial direction of the shaft; a motor magnet; a motor stator; and a housing storing the motor stator and having a motor fixing part for fixing the motor. A first radial-direction distance between the motor fixing part and a central axis is larger than a second radial-direction distance between a radial-direction outer end of the first rotating member and the central axis and is larger than a third radial-direction distance between the radial-direction outer end of the second rotating member and the central axis.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to motors.

A disk drive device disclosed in Patent Document 1 includes a turntable that is rotated by a motor. If the center of gravity of the rotor of the motor deviates from the rotation axis, vibration or abnormal noise may occur during rotation of the motor. Therefore, the motor of Patent Document 1 is provided with a balancer (steel balls) for correcting the unbalanced rotation.

JP 2014-203472 A

It is desired to further reduce vibrations and abnormal noises that occur when the motor rotates.

The present disclosure has been made in view of the above problems, and an object thereof is to provide a motor capable of further suppressing vibration and noise during rotation.

To achieve the above object, a motor according to one aspect includes a shaft extending in an axial direction of a central axis and rotatable in a direction around the central axis, and a shaft fixed to one side of the shaft in the axial direction. a second rotating member fixed to the other side of the shaft in the axial direction; a motor magnet disposed on the outer peripheral side of the shaft and rotatable together with the shaft; and the motor A non-rotatable motor stator including a motor coil disposed opposite to the outer circumference of a magnet, and a housing containing the motor stator and having a motor fixing portion for fixing the motor, wherein the motor fixing portion and the central axis is greater than a second radial distance between the radially outer end of the first rotating member and the central axis, and the radially outer end of the second rotating member and the central axis.

Thus, the motor of the present disclosure is a so-called inner rotor type motor in which the shaft positioned radially in the center rotates. That is, the housing is fixed to the attached body via the motor fixing portion, and the shaft radially inside the housing rotates with respect to the housing. The first rotating member and the second rotating member rotate with the shaft. Therefore, for example, when the first rotating member and the second rotating member rotate with the center of gravity of the first rotating member and the second rotating member shifted from the center axis, the center axis of the shaft rotates relative to the center axis when not rotating. This may cause the motor to vibrate or make abnormal noise.

Here, since the first radial distance is greater than the second radial distance and the third radial distance, the motor fixing portion is radially outward from the radial outer ends of the first rotating member and the second rotating member. To position. Therefore, even if whirling occurs in the shaft, compared to the case where the motor fixing portion is positioned radially inward of the radially outer ends of the first rotating member and the second rotating member, the housing is capable of resisting whirling. can be more firmly fixed to the attached body.

As described above, according to the present disclosure, a motor is provided that can further suppress vibration and noise during rotation.

As a desirable aspect, at least one of the first rotating member and the second rotating member is provided with a groove capable of accommodating a balancer. According to this, by housing the balancer in the concave groove, the center of gravity of the first rotating member or the second rotating member is brought closer to the central axis, so that vibration and abnormal noise during rotation of the motor can be further suppressed. .

As a desirable aspect, the concave groove is located at the radially outer end of the first rotating member or the second rotating member.

By providing the balancer as radially outward as possible, the amount of adjustment of the center of gravity of the first rotating member or the second rotating member is increased, and the amount of balance correction is also increased. Therefore, according to the present disclosure, vibration and noise during rotation can be further suppressed.

Preferably, the housing includes a first housing positioned on one side in the axial direction and a second housing positioned on the other side in the axial direction with respect to the first housing, The member is disposed on one side of the first housing in the axial direction, and the first housing includes an extension portion extending in the radial direction and a radially outer end of the extension portion that is bent to form the and a bent portion extending to the other side in the axial direction. and a first gap extending in the radial direction is provided between the extension portion and the plate-like portion, and a gap between the first flange and the bent portion is provided. A second gap extending in the axial direction is provided between them, and a labyrinth is formed at the intersection of the first gap and the second gap.

Thus, in the present disclosure, since the labyrinth is provided between the first housing and the first rotating member, the labyrinth can suppress the entry of foreign matter into the motor and the scattering of particles from the motor. .

Preferably, the extended portion of the first housing has a recess recessed toward the other side in the axial direction, the plate-like portion of the first rotating member protrudes toward the other side in the axial direction, and , a protrusion inserted into the recess, a gap is provided between the protrusion and the recess, and the gap forms a labyrinth.

Since this labyrinth is formed by the gaps between the concave portions and the convex portions, it has a more intricate structure and the so-called labyrinth effect is enhanced. Therefore, it is possible to further suppress the intrusion of foreign matter into the motor and the scattering of particles from the motor.

Preferably, the second rotating member is arranged on the other side in the axial direction of the second housing, and the second housing includes an extension portion extending in the radial direction and a diameter of the extension portion at the extension portion. The second rotating member includes a plate-like portion extending along the extending portion, and a plate-like portion extending radially outward of the plate-like portion. a second flange bent at an end and extending along the bent portion; a third gap extending in the radial direction is provided between the extended portion and the plate-like portion; A fourth gap extending in the axial direction is provided between the second flange and the bent portion, and a labyrinth is formed at the intersection of the third gap and the fourth gap.

As described above, in the present disclosure, since the labyrinth is provided between the second housing and the second rotating member, the labyrinth can suppress the entry of foreign matter into the motor and the scattering of particles from the motor. .

Preferably, the extended portion of the second housing has a recess recessed on one side in the axial direction, the plate-like portion of the second rotary member protrudes on the one side in the axial direction, and , a protrusion inserted into the recess, a gap is provided between the protrusion and the recess, and the gap forms a labyrinth.

Since this labyrinth is formed by the gaps between the concave portions and the convex portions, it has a more intricate structure and the so-called labyrinth effect is enhanced. Therefore, it is possible to further suppress the intrusion of foreign matter into the motor and the scattering of particles from the motor.

Advantageous Effects of Invention According to the present disclosure, a motor is provided that can further suppress vibration and noise during rotation.

FIG. 1 is a cross-sectional view schematically showing the overall configuration of the motor according to the first embodiment. FIG. 2 is a cross-sectional view enlarging a part of FIG. FIG. 3 is a cross-sectional view schematically showing the overall configuration of the motor according to the second embodiment. FIG. 4 is a sectional view enlarging a part of FIG. FIG. 5 is a cross-sectional view schematically showing the overall configuration of the motor according to the third embodiment. FIG. 6 is a sectional view enlarging a part of FIG.

A form (embodiment) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. In addition, the components described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the components described below can be combined as appropriate.

[First embodiment]
First, the first embodiment will be explained. FIG. 1 is a cross-sectional view schematically showing the overall configuration of the motor according to the first embodiment. FIG. 2 is a cross-sectional view enlarging a part of FIG. As shown in FIGS. 1 and 2, the motor 1 according to the first embodiment directly transmits rotational force to the rotor without intervening a speed reduction mechanism (for example, a speed reduction gear, a transmission belt, etc.), and rotates the rotor. can be rotated. In this embodiment, an inner rotor type motor 1 is applied.

The motor 1 includes a housing 2, a motor stator 3, a position detector 4, a position detector support member 5, a rotor 6, a shaft 7, a first rotating member 500, and a second rotating member 600. Prepare. The motor 1 has an annular shape centered on the central axis Ax. In the embodiment, one side of the central axis Ax in the axial direction is indicated as UP in the drawings. Also, the other side in the axial direction is indicated as LW in the drawings as the lower side. However, the motor 1 is not limited to a mode in which the central axis Ax is arranged along the vertical direction.

The housing 2 includes a lower housing (second housing) 21 and upper housings 22 and 23 . A housing portion 24 is provided inside the lower housing 21 , and a housing portion 25 is provided inside the upper housing 22 . The housing portion 24 houses the motor stator 3 . The position detector 4 is accommodated in the accommodating portion 25 . The housing 2 has an annular shape centered on the central axis Ax. Aluminum, for example, can be used as the material of the housing 2 . Aluminum enhances the heat dissipation of the housing 2 .

The lower housing 21 includes an extension portion 211 , an inner peripheral side plate 212 , a bent portion 214 and an outer peripheral side plate 213 . The extending portion 211 extends in a radial direction orthogonal to the central axis Ax. An inner peripheral side plate 212 that protrudes toward the upper side UP, which is one side in the axial direction, is provided at the inner peripheral side end of the extended portion 211 . A bent portion 214 that protrudes upward is provided at an end portion on the outer peripheral side of the extension portion 211 . The extended portion 211 and the outer peripheral side plate 213 are connected via a bent portion 214 . An outer peripheral side plate 213 is provided above the bent portion 214 . In other words, the extended portion 211 extends radially outward along the radial direction, is bent at the radially outer end of the extended portion 211, and the bent portion 214 extends upward (one side in the axial direction). ing. The axial height (vertical height) of the outer peripheral side plate 213 is higher than the axial height of the inner peripheral side plate 212 . Housing mounting holes (motor fixing portions) 124 and 125 are provided in the lower portion of the outer peripheral side plate 213 . The motor 1 can be attached to an attached body via housing attachment holes (motor fixing portions) 124 and 125 .

The upper housing (first housing) 22 includes an outer peripheral portion 221 , a bent portion 222 and an extended portion 223 . The upper housing (first housing) 22 is a lid-like member that covers the upper opening of the lower housing 21 . The outer peripheral end portion of the outer peripheral portion 221 is fitted into a recess 213 a in the upper portion of the outer peripheral side plate 213 of the lower housing 21 and fixed to the upper portion of the outer peripheral side plate 213 via the bolt 110 . The bent portion 222 extends upward from the inner peripheral side of the outer peripheral portion 221 . The extending portion 223 extends radially inward from the upper end portion of the bent portion 222, that is, in a direction approaching the central axis Ax. In other words, the extension portion 223 extends radially outward, bends at the radial outer end of the extension portion 223, and bends downward (the other side in the axial direction). extended.

The upper housing 23 has an inner peripheral portion 231 , a connecting portion 232 and an outer peripheral portion 233 . The inner peripheral portion 231 extends in the axial direction (vertical direction in FIG. 1). An inner peripheral end portion of the extended portion 223 of the upper housing 22 is fixed to the upper end of the inner peripheral portion 231 via a bolt 114 . A connecting portion 232 extends radially outward from the lower end of the inner peripheral portion 231 . An outer peripheral portion 233 extends from the radially outer end of the connecting portion 232 toward the other side in the axial direction (lower side LW in FIG. 1).

The shaft 7 extends in the axial direction (vertical direction in FIG. 1). The shaft 7 has a cylindrical portion 71 and a projecting portion 72 . The cylindrical portion 71 is a cylindrical member extending in the axial direction. A through hole 70 is provided inside the cylindrical portion 71 . The through hole 70 axially penetrates the cylindrical portion 71 . The cylindrical portion 71 has a small diameter portion 711 and a large diameter portion 712 . Since the outer diameter of the large diameter portion 712 is larger than the outer diameter of the small diameter portion 711, the upper surface of the large diameter portion 712 is exposed. A bolt hole 121 is provided in the upper end surface of the shaft 7 , and a bolt hole 123 is provided in the lower end surface of the shaft 7 . Female threads are formed on the inner peripheral surfaces of the bolt holes 121 and 123 , and the female threads mesh with the outer peripheral male threads of the bolts 115 and 116 .

A first rotating member 500 is attached to the upper surface 71 a of the cylindrical portion 71 . The first rotating member 500 has a cylindrical shape extending along the circumferential direction around the central axis Ax.

The first rotating member 500 includes an annular portion 510 , a plate-like portion 520 and a first flange 530 . The annular portion 510 has an upper surface 511 , a lower surface 512 , an inner peripheral surface 513 and an outer peripheral surface 514 . The upper surface 511 and the lower surface 512 overlap the upper surface 71a of the cylindrical portion 71 when viewed from above. A through hole 515 is provided in the annular portion 510 . The bolt 115 passes through the through hole 515 and meshes with the bolt hole 121 . Thereby, the first rotating member 500 is fastened to the upper surface 71 a of the cylindrical portion 71 . The inner peripheral surface 513 is flush with the inner peripheral surface 71 c of the cylindrical portion 71 . The inner peripheral surface 513 and the outer peripheral surface 514 are cylindrical surfaces extending along the circumferential direction around the central axis Ax. The lower surface 512 contacts the upper surface 71a. The annular portion 510 is provided with a mounting object mounting hole (mounting portion) 120 that is open on the upper side. A bolt can be engaged with the mounting object mounting hole 120, and the mounted object is mounted to the mounting object mounting hole 120 via the bolt. The mounted object is, for example, a polishing machine of a semiconductor manufacturing apparatus.

The plate-like portion 520 has an upper surface 521 , a lower surface 522 , an inner peripheral surface 523 and an outer peripheral surface 524 . The upper surface 521 is positioned below the upper surface 511 . A recessed groove 525 recessed downward (in the axial direction of the central axis Ax) is provided at the radially outer end of the upper surface 521 . A balancer 526 is accommodated in the concave groove 525 . The balancer 526 adjusts the center of gravity of the first rotating member 500 to correct the balance when the shaft 7 rotates. Balancer 526 is, for example, an epoxy resin. The inner peripheral surface 523 and the outer peripheral surface 524 are cylindrical surfaces extending along the circumferential direction around the central axis Ax. The inner peripheral surface 523 contacts the outer peripheral surface of the upper end portion of the small diameter portion 711 .

The first flange 530 extends downward from the radially outer end of the plate-like portion 520 . The first flange 530 has a cylindrical shape extending along the circumferential direction around the central axis Ax. First flange 530 has a lower surface 532 , an inner peripheral surface 533 and an outer peripheral surface 534 . The lower surface 532 is parallel to the upper surface 521 and the lower surface 522 of the plate-like portion 520 . The inner peripheral surface 533 of the first flange 530 is arranged to face the outer peripheral surface 222a of the bent portion 222 .

A first gap 540 is provided between the upper surface 223 a of the extended portion 223 of the upper housing 22 and the lower surface 522 of the plate-like portion 520 . A second gap 541 is provided between the outer peripheral surface 222 a of the bent portion 222 and the inner peripheral surface 533 of the first flange 530 . The first gap 540 and the second gap 541 communicate with each other through an intersection 542 . The first gap 540 extends radially, the second gap 541 extends axially, and a labyrinth 543 is formed at an intersection 542 .

A second rotating member 600 is attached to the lower surface 71 b of the cylindrical portion 71 . The second rotating member 600 has a cylindrical shape extending along the circumferential direction around the central axis Ax.

The second rotating member 600 includes an annular portion 610 , a plate-like portion 620 and a second flange 630 . The annular portion 610 has a lower surface 611 , an upper surface 612 , an inner peripheral surface 613 and an outer peripheral surface 614 . The lower surface 611 and the upper surface 612 overlap the lower surface 71b of the cylindrical portion 71 when viewed from below. A through hole 615 is provided in the annular portion 610 . The bolt 116 passes through the through hole 615 and meshes with the bolt hole 123 . Thereby, the second rotating member 600 is fastened to the lower surface 71 b of the cylindrical portion 71 . The inner peripheral surface 613 is flush with the inner peripheral surface 71 c of the cylindrical portion 71 . The inner peripheral surface 613 and the outer peripheral surface 614 are cylindrical surfaces extending along the circumferential direction around the central axis Ax. The upper surface 612 contacts the lower surface 71b. The annular portion 610 is provided with a mounting object mounting hole (mounting portion) 122 that is open at the bottom. A bolt can be engaged with the mounting object mounting hole 122, and the mounted object is mounted to the mounting object mounting hole 122 via the bolt.

The plate-like portion 620 has a lower surface 621 , an upper surface 622 , an inner peripheral surface 623 and an outer peripheral surface 624 . The lower surface 621 is positioned above the lower surface 611 . A radially inner end portion of the plate-like portion 620 is provided with a radially inner groove 525A. The recessed groove 525A opens on the outer peripheral surface 624 side. A balancer 526 is accommodated in the concave groove 525A. The balancer 526 adjusts the center of gravity of the second rotating member 600 to correct the balance when the shaft 7 rotates.

The recessed groove 525A provided in the second rotating member 600 may be replaced with the recessed groove 525 provided in the first rotating member 500. FIG. Further, the recessed groove 525 provided in the first rotating member 500 may be in the form of a recessed groove 525A provided in the second rotating member 600. FIG. Furthermore, the concave groove and the balancer may be provided on only one of the first rotating member 500 and the second rotating member 600 .

The inner peripheral surface 623 and the outer peripheral surface 624 are cylindrical surfaces extending along the circumferential direction around the central axis Ax. The inner peripheral surface 623 contacts the outer peripheral surface of the upper end portion of the small diameter portion 711 .
The second flange 630 extends upward from the radially outer end of the plate-like portion 620 . The second flange 630 has a cylindrical shape extending along the circumferential direction around the central axis Ax. The second flange 630 has an upper surface 632 , an inner peripheral surface 633 and an outer peripheral surface 634 . The upper surface 632 is parallel to the lower surface 621 and the upper surface 622 of the plate-like portion 620 . An inner peripheral surface 633 of the second flange 630 is arranged to face the outer peripheral surface 214 a of the bent portion 214 .

A third gap 640 is provided between the lower surface 211 a of the extended portion 211 of the lower housing 21 and the upper surface 622 of the plate-like portion 620 . A fourth gap 641 is provided between the outer peripheral surface 214 a of the bent portion 214 and the inner peripheral surface 633 of the second flange 630 . The third gap 640 and the fourth gap 641 communicate with each other through an intersection 642 . The third gap 640 extends radially, the fourth gap 641 extends axially, and a labyrinth 643 is formed at an intersection 642 .

The protruding portion 72 is an annular member that protrudes radially outward from the outer peripheral surface of the cylindrical portion 71 . A concave groove 73 is provided on the upper surface of the projecting portion 72 . The concave groove 73 extends in the circumferential direction. The groove 73 has a rectangular cross section including the central axis Ax. A balancer 74 is accommodated in the concave groove 73 . The balancer 74 adjusts the balance when the shaft 7 rotates. The balancer 74 is, for example, epoxy resin. A motor magnet 61 of the rotor 6 is fixed to the outer peripheral side of the projecting portion 72 . The motor magnet 61 is fixed to the protrusion 72, for example, by gluing. The motor magnet 61 has an annular shape centered on the central axis Ax.

Here, as shown in FIG. 2, the radial distance between the housing mounting holes 124 and 125 and the central axis Ax is defined as a first radial distance L1. In FIG. 2, the first radial distance L1 is the distance along the radial direction from the radial center of the housing mounting hole 124 to the central axis Ax. is also the first radial distance L1. Further, the distance along the radial direction between the outer peripheral surface 524 (outer end in the radial direction) of the plate-like portion 520 of the first rotating member 500 and the central axis Ax is defined as a second radial distance L2. The distance in the radial direction between the outer peripheral surface 624 (the radially outer end) of the shaped portion 620 and the central axis Ax is defined as a third radial distance L3. Then, the first radial distance L1 is greater than the second radial distance L2 and the third radial distance L3.

Bearing 100 is a deep groove ball bearing having inner ring 101 , outer ring 103 and rolling elements 102 . The inner ring 101 and the outer ring 103 are relatively rotatable via spherical rolling elements 102 . In this embodiment, bearings 100 are provided on the upper and lower sides, respectively. The inner ring 101 of the upper bearing 100 is placed on the upper surface of the large diameter portion 712 . An annular spacer 45 and a wave washer 44 are sandwiched between the upper surface of the outer ring 103 and the inner peripheral portion 231 of the upper housing 23 and the lower surface of the connecting portion 232 . The wave washer 44 is shrunk by a compressive load in the axial direction (vertical direction) and is preloaded, so that the outer ring 103 is fixed in the axial direction by the pressurization (elastic force) of the wave washer 44 . be. Thereby, the upper bearing 100 supports the axial central portion of the shaft 7 rotatably with respect to the upper housing 23 . The inner ring 101 of the lower bearing 100 is fixed to the outer circumference of the shaft 7 , and the outer ring 103 is fixed to the extended portion 211 and the inner peripheral side plate 212 . Therefore, the lower bearing 100 rotatably supports the other axial end of the shaft 7 (lower LW end) with respect to the lower end of the lower housing 21 .

The position detector support member 5 radially extends from the cylindrical portion 71 of the shaft 7 to the vicinity of the outer peripheral portion 221 of the upper housing 22 . The position detector support member 5 is made of a non-magnetic material, and aluminum or stainless steel, for example, can be used as the non-magnetic material. Further, the position detector support member 5 has an annular shape centered on the central axis Ax, and is arranged so as to cover the upper opening of the lower housing 21 . The position detector support member 5 has a shape in which two L-shaped members are connected in a cross section including the central axis Ax. Specifically, the position detector support member 5 has a first portion 51 , a second portion 52 , a third portion 53 , and a fourth portion 54 . The first portion 51 extends radially outward. The first portion 51 is fixed to the upper portion of the projecting portion 72 via bolts 113 . Since the protruding portion 72 is provided with the recessed groove 73 , the upper side UP of the recessed groove 73 is sealed by the first portion 51 . The second portion 52 extends from the radial outer end of the first portion 51 toward one axial side (upper side UP). The third portion 53 extends radially outward from one axial end (upper UP end) of the second portion 52 . The fourth portion 54 extends from the radial outer end of the third portion 53 toward one axial side (upper side UP). The fourth portion 54 is arranged close to the inner peripheral surface of the outer peripheral portion 221 of the upper housing 22 . The fourth portion 54 is arranged to face the inner peripheral surface of the outer peripheral portion 221 .

The position detector 4 is also called a rotation sensor and detects the rotation state (for example, rotation angle) of the motor 1 . Various specifications can be applied to the position detector, but the position detector 4 of the first embodiment will be described as an example of a radial gap type resolver. By the position detector 4, it is possible to accurately rotate a mounted object such as various works attached to the shaft 7 by a predetermined angle and position it at a target position with high accuracy. The position detector 4 includes a resolver stator (detection stator) 41 and a resolver rotor (detection rotor) 42 . The resolver stator 41 and the resolver rotor 42 have an annular shape centered on the central axis Ax. The resolver stator 41 is fixed to the upper surface of the connecting portion 232 of the upper housing 23 via bolts 112 . The resolver stator 41 has a winding portion 411 . The resolver rotor 42 is placed on the upper surface of the third portion 53 of the position detector support member 5 via the spacer 43 . The resolver rotor 42 is arranged close to the inner peripheral surface of the fourth portion 54 of the position detector support member 5 . The resolver rotor 42 is mounted on the spacer 43 and fixed to the third portion 53 via the bolt 111 . The resolver rotor 42 is arranged radially outside the motor magnet 61 . The resolver stator 41 and the resolver rotor 42 have substantially the same position in the axial direction (vertical direction), and are arranged to face each other in the radial direction.

The motor stator 3 has a stator core (iron core) 31 and a motor coil 32 . The stator core 31 is configured, for example, by stacking a plurality of thin plates such as one annular electromagnetic steel plate or cold-rolled steel plate formed by punching in the axial direction. A motor coil 32 is wound around the stator core 31 . The stator core 31 and the motor magnet 61 have substantially the same axial position. The stator core 31 is arranged to face the motor magnet 61 in the radial direction. The resolver rotor 42 is arranged so as to overlap the motor coil 32 when viewed from the axial direction. The position detector 4 is arranged on one side of the motor coil 32 in the axial direction. The axial distance between the center of the motor magnet 61 in the axial direction (vertical direction) and the center of the plate-like portion 620 of the second rotating member 600 in the axial direction (vertical direction) is direction) and the center of the plate-like portion 520 of the first rotating member 500 in the axial direction (vertical direction). In other words, the second rotating member 600 is provided closer to the motor magnet 61 in the axial direction than the first rotating member 500 is.

As described above, the rotating parts in the motor 1 are the shaft 7 , the rotor 6 including the motor magnet 61 , the position detector supporting member 5 , the resolver rotor 42 , the first rotating member 500 and the second rotating member 600 . Non-rotatable parts of the motor 1 are the housing 2 , the motor stator 3 including the motor coil 32 , and the resolver stator 41 . The rotating portion of the motor 1 is rotatable via two upper and lower bearings 100 with respect to the non-rotatable portion.

As described above, the motor 1 according to the first embodiment includes the shaft 7 extending in the axial direction of the central axis Ax and rotatable in the direction around the central axis Ax, and the upper side of the shaft 7 (upper side (axis A first rotating member 500 fixed to one side in the direction )) and provided with a mounting object mounting hole (mounting portion) 120 for mounting a mounted object, and fixed to the lower side (the other side in the axial direction) of the shaft 7 a second rotating member 600 provided with a mounted object mounting hole (mounting portion) 122 for mounting a mounted object; a motor magnet 61 arranged on the outer peripheral side of the shaft 7 and rotatable together with the shaft 7; A non-rotatable motor stator 3 including a motor coil 32 arranged opposite to the outer circumference of the motor magnet 61, and a housing mounting hole (motor fixing portion) 124 for housing the motor stator 3 and fixing the motor 1. , 125, and the first radial distance L1 between the housing mounting holes (motor fixing portions) 124, 125 and the central axis Ax is equal to the radial outer end of the first rotary member 500 and the central axis Ax and greater than the third radial distance L3 between the radial outer end of the second rotating member 600 and the central axis Ax.

Thus, the motor 1 of the present embodiment is a so-called inner rotor type motor in which the shaft 7 on the radial center side rotates. That is, the housing 2 is fixed to the mounting body through the housing mounting holes (motor fixing portions) 124 and 125, and the shaft 7 located radially inside the housing 2 rotates. The first rotating member 500 and the second rotating member 600 rotate together with the shaft 7 . Therefore, for example, when the first rotating member 500 and the second rotating member 600 rotate with the center of gravity of the first rotating member 500 and the second rotating member 600 shifted from the central axis, the central axis Ax of the shaft 7 does not rotate. Inclination with respect to the central axis Ax of time, so-called whirling, may occur, and this whirling may cause the motor 1 to vibrate or make abnormal noise.

Here, since the first radial distance L1 is greater than the second radial distance L2 and the third radial distance L3, the housing mounting holes (motor fixing portions) 124 and 125 are aligned with the first rotary member 500 and the second radial distance L3. It is located radially outside the radially outer end of the rotating member 600 . Therefore, compared to the case where the housing mounting holes (motor fixing portions) 124 and 125 are positioned radially inward of the radially outer ends of the first rotating member 500 and the second rotating member 600, the shaft 7 whirles more. Even if it occurs, the housing 2 can be more firmly fixed to the mounting object against the whirling.

As described above, according to the present embodiment, the motor 1 is provided that can further suppress vibration and noise during rotation.

The first rotating member 500 and the second rotating member 600 are provided with concave grooves 525 and 525A in which the balancer 526 can be accommodated. According to this, by housing the balancer 526 in the concave grooves 525 and 525A, it is possible to further suppress vibration and abnormal noise of the motor 1 during rotation.

The grooves 525 and 525A are located at the radially outer end of the first rotating member 500 or the second rotating member 600. As shown in FIG. If the balancer 526 is provided as radially outward as possible, the amount of adjustment of the center of gravity of the motor 1 as a whole becomes large, that is, the amount of balance correction becomes large. Therefore, according to this, it is possible to further suppress vibration and abnormal noise during rotation.

The housing 2 includes an upper housing (first housing) 22 positioned on the upper side (one side in the axial direction) and a lower housing positioned below the upper housing (first housing) 22 (the other side in the axial direction). (second housing) 21, the first rotary member 500 is arranged above (on one side in the axial direction) an upper housing (first housing) 22, and the upper housing (first housing) 22 is The first rotary member 500 has an extension portion 223 extending in the radial direction and a bent portion 222 that is bent at the radially outer end of the extension portion 223 and extends downward (the other side in the axial direction). , a plate-like portion 520 extending along the extending portion 223 , and a first flange 530 bent at the radially outer end of the plate-like portion 520 and extending along the bent portion 222 , and the extending portion 223 and A radially extending first gap 540 is provided between the plate-like portion 520 and an axially extending second gap 541 is provided between the first flange 530 and the bent portion 222 . A labyrinth 543 is formed at an intersection 542 between the gap 540 and the second gap 541 .

As described above, in this embodiment, since the labyrinth 543 is provided between the upper housing (first housing) 22 and the first rotating member 500 , the labyrinth 543 prevents foreign matter from entering the motor 1 and prevents the inside of the motor 1 from entering. It is possible to suppress particle scattering from.

The housing 2 includes an upper housing (first housing) 22 positioned on the upper side (one side in the axial direction) and a lower housing positioned below the upper housing (first housing) 22 (the other side in the axial direction). (second housing) 21, the second rotating member 600 is arranged below (the other side in the axial direction) the lower housing (second housing) 21, and the lower housing (second housing) 21 is , and a bent portion 214 bent at the radially outer end of the extended portion 211 and extending upward (one side in the axial direction). , a plate-like portion 620 extending along the extending portion 211 , and a second flange 630 bent at the radially outer end of the plate-like portion 620 and extending along the bent portion 214 . A radially extending third gap 640 is provided between the plate-like portion 620 and an axially extending fourth gap 641 is provided between the second flange 630 and the bent portion 214 . A labyrinth 643 is formed at an intersection 642 between the gap 640 and the fourth gap 641 .

As described above, in this embodiment, since the labyrinth 643 is provided between the lower housing (second housing) 21 and the second rotating member 600, the labyrinth 643 prevents foreign matter from entering the motor 1 and prevents the motor 1 from being damaged. Particle scattering from the inside can be suppressed.

Also, the first rotating member 500 is attached to the upper portion of the shaft 7 from above (one side in the axial direction) and then fastened with bolts 115 . The second rotating member 600 is attached to the lower portion of the shaft 7 from below (the other side in the axial direction) and then fastened with bolts 116 . In this manner, the first rotating member 500 and the second rotating member 600 are attached to the shaft 7 from the axial direction, and therefore are easy to assemble.
Balance adjustment is performed using the balancer 526 on the first rotating member 500 , and balance adjustment is performed using the balancer 526 on the second rotating member 600 . As described above, in the present embodiment, two-sided correction balance adjustment is performed on one side and the other side of the shaft 7 in the axial direction, so that vibration and abnormal noise during rotation of the motor 1 can be further suppressed. .

[Second embodiment]
Next, a second embodiment will be described with a focus on the first rotating member and the second rotating member. FIG. 3 is a cross-sectional view schematically showing the overall configuration of the motor according to the second embodiment. FIG. 4 is a sectional view enlarging a part of FIG.

A first rotating member 500A and a second rotating member 600A according to the second embodiment have a first flange 530 and a second flange 630 that differ from the first rotating member 500 and the second rotating member 600 according to the first embodiment. The difference is that there is no Details will be described below.

As shown in FIGS. 3 and 4, the first rotating member 500A according to the second embodiment is attached to the upper surface 71a of the cylindrical portion 71. As shown in FIGS. The first rotating member 500A has a cylindrical shape extending along the circumferential direction around the central axis Ax.

The first rotating member 500A includes an annular portion 510 and a plate-like portion 520A.

The plate-like portion 520A has an upper surface 521A, a lower surface 522A, an inner peripheral surface 523A, and an outer peripheral surface 524A. The upper surface 521A is positioned below the upper surface 511 . A recessed groove 525 recessed downward (in the axial direction of the central axis Ax) is provided at the radially outer end of the plate-like portion 520A. A balancer 526 is accommodated in the concave groove 525 . The inner peripheral surface 523A and the outer peripheral surface 524A are cylindrical surfaces extending along the circumferential direction around the central axis Ax. The inner peripheral surface 523A contacts the outer peripheral surface of the upper end portion of the small diameter portion 711 .

Here, a first gap 540 is provided between the upper surface 223a of the extended portion 223 of the upper housing 22 and the lower surface 522A of the plate-like portion 520A.

A second rotating member 600A is attached to the lower surface 71b of the cylindrical portion 71 . The second rotating member 600A has a cylindrical shape extending along the circumferential direction around the central axis Ax.

The second rotating member 600A includes an annular portion 610 and a plate-like portion 620A.

The plate-like portion 620A has a lower surface 621A, an upper surface 622A, an inner peripheral surface 623A, and an outer peripheral surface 624A. 621 A of lower surfaces are located above the lower surface 611. As shown in FIG. A radially inner groove 525A is provided at the radially outer end of the plate-like portion 620A. The concave groove 525A opens on the side of the outer peripheral surface 624A. A balancer 526 is accommodated in the concave groove 525A. The balancer 526 adjusts the balance when the shaft 7 rotates. Balancer 526 is, for example, an epoxy resin.

The recessed groove 525A provided in the second rotating member 600A may be replaced with the recessed groove 525 provided in the first rotating member 500A. Further, the recessed groove 525 provided in the first rotating member 500A may be in the form of a recessed groove 525A provided in the second rotating member 600A.

The inner peripheral surface 623A and the outer peripheral surface 624A are cylindrical surfaces extending along the circumferential direction around the central axis Ax. 623 A of internal peripheral surfaces contact|abut the outer peripheral surface of the upper end part of the small diameter part 711. As shown in FIG.

Here, a third gap 640 is provided between the lower surface 211a of the extended portion 211 of the lower housing 21 and the upper surface 622A of the plate-like portion 620A.

Here, as shown in FIG. 4, the radial distance between the housing mounting holes 124 and 125 and the central axis Ax is defined as a first radial distance L1. In FIG. 4, the first radial distance L1 is the distance along the radial direction from the radial center of the housing mounting hole 124 to the central axis Ax. is also the first radial distance L1. Further, the distance along the radial direction between the outer peripheral surface 524A (radial outer end) of the plate-like portion 520A of the first rotating member 500A and the central axis Ax is defined as a second radial distance L2, and the plate portion of the second rotating member 600A The distance in the radial direction between the outer peripheral surface 624A (the radially outer end) of the shaped portion 620 and the central axis Ax is defined as a third radial distance L3. Then, the first radial distance L1 is greater than the second radial distance L2 and the third radial distance L3.

As described above, the motor 1A according to the second embodiment can also obtain the same effect as the motor 1 according to the first embodiment. Since the first rotating member 500A and the second rotating member 600A do not have the first flange 530 and the second flange 630 in comparison with the first rotating member 500 and the second rotating member 600, the weight and size of the motor 1A are reduced. can be further reduced.

[Third embodiment]
Next, the third embodiment will be described with a focus on the first rotating member and the second rotating member. FIG. 5 is a cross-sectional view schematically showing the overall configuration of the motor according to the third embodiment. FIG. 6 is a sectional view enlarging a part of FIG.

The first rotating member 500B and the second rotating member 600B according to the second embodiment are different from the first rotating member 500 and the second rotating member 600 according to the first embodiment in that the protrusions 545 and 645 are provided. differ. Details will be described below.

A first rotating member 500B is attached to the upper surface 71a of the cylindrical portion 71 . The first rotating member 500B has a cylindrical shape extending along the circumferential direction around the central axis Ax.

The first rotating member 500B includes an annular portion 510, a plate-like portion 520B, and a first flange 530. As shown in FIG.

The plate-like portion 520B has an upper surface 521B, a lower surface 522B, an inner peripheral surface 523B, and an outer peripheral surface 524B. The upper surface 521B is positioned below the upper surface 511 . A recessed groove 525 recessed downward (in the axial direction of the central axis Ax) is provided at the radially outer end of the upper surface 521B. A balancer 526 is accommodated in the concave groove 525 . The inner peripheral surface 523B and the outer peripheral surface 524B are cylindrical surfaces extending along the circumferential direction around the central axis Ax. The inner peripheral surface 523</b>B contacts the outer peripheral surface of the upper end portion of the small diameter portion 711 .

A protrusion 545 protruding downward is provided on the lower surface 522B. The convex portion 545 has a rectangular shape in a cross section including the central axis Ax. The convex portion 545 is an annular body extending along the circumferential direction around the central axis Ax. The extended portion 223 of the upper housing 22 is provided with a concave portion 546 that is recessed downward. The recessed portion 546 is formed by recessing the upper surface 223a of the extension portion 223 downward. The recess 546 has a rectangular cross section including the central axis Ax. The protrusion 545 is inserted into the recess 546 . A gap is formed between the protrusion 545 and the recess 546 when the protrusion 545 is inserted into the recess 546 . A gap between the convex portion 545 and the concave portion 546 forms a labyrinth 544 .

A labyrinth may be formed by providing a concave portion in the plate-like portion 520B, providing a convex portion in the extended portion 223, and inserting the convex portion into the concave portion.

The first flange 530 extends downward from the radially outer end of the plate-like portion 520B. Also, a labyrinth 543 is formed at the intersection 542 .

A second rotating member 600B is attached to the lower surface 71b of the cylindrical portion 71 . The second rotating member 600B has a cylindrical shape extending along the circumferential direction around the central axis Ax.

The second rotating member 600B includes an annular portion 610, a plate-like portion 620B, and a second flange 630. As shown in FIG.

The plate-like portion 620B has a lower surface 621B, an upper surface 622B, an inner peripheral surface 623B, and an outer peripheral surface 624B. The bottom surface 621B is positioned above the bottom surface 611 . A radially inner groove 525A is provided at the radially outer end of the plate-like portion 620B. The concave groove 525A opens on the side of the outer peripheral surface 624B. A balancer 526 is accommodated in the concave groove 525A.

The recessed groove 525A provided in the second rotating member 600B may be replaced with the recessed groove 525 provided in the first rotating member 500B. Further, the recessed groove 525 provided on the first rotating member 500B may be in the form of a recessed groove 525A provided on the second rotating member 600B.
The inner peripheral surface 623B and the outer peripheral surface 624B are cylindrical surfaces extending along the circumferential direction around the central axis Ax. The inner peripheral surface 623B contacts the outer peripheral surface of the upper end portion of the small diameter portion 711 .

A convex portion 645 that protrudes upward is provided on the upper surface 622B. The convex portion 645 has a rectangular shape in a cross section including the central axis Ax. The convex portion 645 is an annular body extending along the circumferential direction around the central axis Ax. The extended portion 211 of the lower housing 21 is provided with a concave portion 646 that is recessed upward. The recessed portion 646 is formed by recessing the lower surface 211a of the extended portion 211 upward. The recess 646 has a rectangular cross section including the central axis Ax. A protrusion 645 is inserted into the recess 646 . A gap is formed between the protrusion 645 and the recess 646 when the protrusion 645 is inserted into the recess 646 . A gap between the convex portion 645 and the concave portion 646 forms a labyrinth 644 .

A labyrinth may be formed by providing a concave portion in the plate-like portion 620B, providing a convex portion in the extension portion 211, and inserting the convex portion into the concave portion.

The second flange 630 extends upward from the radially outer end of the plate-like portion 620B. Also, a labyrinth 643 is formed at the intersection 642 .

Here, as shown in FIG. 6, the radial distance between the housing mounting holes 124 and 125 and the central axis Ax is defined as a first radial distance L1. In FIG. 6, the first radial distance L1 is the distance along the radial direction from the radial center of the housing mounting hole 124 to the central axis Ax. is also the first radial distance L1. Further, the distance along the radial direction between the outer peripheral surface 524B (radial outer end) of the plate-like portion 520B of the first rotating member 500B and the central axis Ax is defined as a second radial distance L2. A distance along the radial direction between the outer peripheral surface 624B (diameter direction outer end) of the shaped portion 620 and the central axis Ax is defined as a third radial distance L3. Then, the first radial distance L1 is greater than the second radial distance L2 and the third radial distance L3.

As described above, in the motor 1B according to the third embodiment, the extending portion 223 of the upper housing (first housing) 22 has the concave portion 546 that is concave downward (the other side in the axial direction). The plate-like portion 520 of the rotating member 500 has a convex portion 545 that protrudes downward (the other side in the axial direction) and is inserted into the concave portion 546 . A gap is provided and a labyrinth 544 is formed by the gap.
Since the labyrinth 544 is formed by the gap between the concave portion 546 and the convex portion 545, it has a more complicated structure and the so-called labyrinth effect is enhanced. Therefore, it is possible to further suppress the entry of foreign matter into the motor 1B and the scattering of particles from the inside of the motor 1B.

The extended portion 211 of the lower housing (second housing) 21 has a concave portion 646 that is recessed upward (one side in the axial direction), and the plate-like portion 620 of the second rotating member 600 extends upward (one side in the axial direction). ) and is inserted into the recess 646 , a gap is provided between the protrusion 645 and the recess 646 , and the gap forms a labyrinth 644 .

Thus, in this embodiment, the labyrinth 644 formed by the gap between the concave portion 646 and the convex portion 645 has a more intricate structure, and the so-called labyrinth effect is enhanced. Therefore, it is possible to further suppress the entry of foreign matter into the motor 1B and the scattering of particles from the inside of the motor 1B.

1, 1A, 1B Motor 2 Housing 3 Motor Stator 4 Position Detector 5 Position Detector Support Member 6 Rotor 7 Shaft 21 Lower Housing (Second Housing)
22 Upper housing (first housing)
23 upper housings 24, 25 accommodating portion 31 stator core (iron core)
32 motor coil 41 resolver stator (detection stator)
42 resolver rotor (rotor for detection)
43 Spacer 44 Wave washer (Wave washer)
45 Spacer 51 First portion 52 Second portion 53 Third portion 54 Fourth portion 61 Motor magnet 70 Through hole 71 Cylindrical portion 71a Upper surface 71b Lower surface 71c Inner peripheral surface 72 Protruding portion 73 Groove 74 Balancer 100 Bearing 101 Inner ring 102 Rolling element 103 Outer rings 110, 111, 112, 113, 114, 115, 116 Bolts 120, 122 Mounting hole (mounting portion)
121, 123 bolt holes 124, 125 housing mounting holes (motor fixing portion)
211 Extended portion 211a Lower surface 212 Inner peripheral side plate 213 Outer peripheral side plate 213a Recess 214 Bent portion 214a Outer peripheral surface 221 Outer peripheral portion 222 Bent portion 222a Outer peripheral surface 223 Extended portion 223a Upper surface 231 Inner peripheral portion 232 Connecting portion 233 Outer peripheral portion 411 Winding portion 500, 500A, 500B First rotating member 510 Annular portion 511 Upper surface 512 Lower surface 513 Inner peripheral surface 514 Outer peripheral surface 515 Through holes 520, 520A, 520B Plate-like portions 521, 521A, 521B Upper surfaces 522, 522A, 522B Lower surfaces 523, 523A , 523B inner peripheral surface 524, 524A, 524B outer peripheral surface 525, 525A concave groove 526 balancer 530 first flange 532 lower surface 533 inner peripheral surface 534 outer peripheral surface 540 first gap 541 second gap 542 intersecting portion 543 labyrinth 544 labyrinth 545 convex portion 546 recesses 600, 600A, 600B second rotating member 610 annular portion 611 lower surface 612 upper surface 613 inner peripheral surface 614 outer peripheral surface 615 through hole 620 plate-like portion 621 lower surface 622 upper surface 623 inner peripheral surface 624 outer peripheral surface 630 second flange 632 upper surface 633 inner peripheral surface 634 outer peripheral surface 640 third gap 641 fourth gap 642 intersecting portion 643 labyrinth 644 labyrinth 645 convex portion 646 concave portion 711 small diameter portion 712 large diameter portion Ax central axis

Claims (7)

a shaft extending in the axial direction of a central axis and rotatable in a direction around the central axis;
a first rotating member fixed to one side of the shaft in the axial direction;
a second rotating member fixed to the other side of the shaft in the axial direction;
a motor magnet disposed on the outer peripheral side of the shaft and rotatable together with the shaft;
a non-rotatable motor stator including a motor coil arranged opposite to the outer peripheral side of the motor magnet;
a housing containing the motor stator and having a motor fixing portion for fixing the motor;
A first radial distance between the motor fixing portion and the central axis is
greater than a second radial distance between the radially outer end of the first rotating member and the central axis and greater than a third radial distance between the radially outer end of the second rotating member and the central axis big,
motor. At least one of the first rotating member and the second rotating member is provided with a concave groove capable of accommodating a balancer.
A motor according to claim 1. The concave groove is located at a radially outer end of the first rotating member or the second rotating member,
A motor according to claim 2. The housing includes a first housing positioned on one side in the axial direction and a second housing positioned on the other side in the axial direction with respect to the first housing, and the first rotating member arranged on one side in the axial direction of the first housing,
The first housing has an extension portion extending in the radial direction, and a bent portion that is bent at a radially outer end of the extension portion and extends to the other side in the axial direction,
The first rotating member has a plate-like portion extending along the extended portion, and a first flange bent at a radially outer end of the plate-like portion and extending along the bent portion,
A first gap extending in the radial direction is provided between the extension portion and the plate-like portion,
A second gap extending in the axial direction is provided between the first flange and the bent portion,
a labyrinth is formed at the intersection of the first gap and the second gap;
A motor according to any one of claims 1 to 3. the extending portion of the first housing has a recess recessed on the other side in the axial direction,
the plate-like portion of the first rotating member has a convex portion that protrudes to the other side in the axial direction and is inserted into the concave portion;
A gap is provided between these protrusions and recesses, and the gap forms a labyrinth.
A motor according to claim 4. The second rotating member is arranged on the other side in the axial direction of the second housing,
The second housing has an extension portion extending in the radial direction, and a bent portion that is bent at a radially outer end of the extension portion and extends to one side in the axial direction,
The second rotating member has a plate-like portion extending along the extended portion, and a second flange bent at a radially outer end of the plate-like portion and extending along the bent portion,
A third gap extending in the radial direction is provided between the extension portion and the plate-like portion,
A fourth gap extending in the axial direction is provided between the second flange and the bent portion,
a labyrinth is formed at the intersection of the third gap and the fourth gap;
A motor according to claim 4 or 5. the extending portion of the second housing has a recess recessed on one side in the axial direction,
the plate-like portion of the second rotating member has a convex portion that protrudes to one side in the axial direction and is inserted into the concave portion;
A gap is provided between these protrusions and recesses, and the gap forms a labyrinth.
A motor according to claim 6.

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