JP7222732B2 - motor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor in which one end of a rotating shaft supported by bearings is biased by a biasing member toward the other end of the rotating shaft in the axial direction of the rotating shaft.

Conventionally, there is a stepping motor disclosed in Patent Document 1, for example, as this type of motor.

A bearing in this stepping motor has a cylindrical portion and a flange portion. The outer peripheral surface of the cylindrical portion fits into a through hole formed in the end surface of the case, and the flange portion contacts the inner surface of the end surface of the case. An annular groove is formed in the outer peripheral surface of the cylindrical portion that protrudes from the end surface portion to the outside of the case. The bearing is held in the case by clamping the end surface of the case between the stopper engaging with the groove and the flange. The stopper has an elastic piece that contacts one end of the rotor shaft supported by the bearing and presses the one end toward the other end. Therefore, the stopper has a function of holding the bearing in the case and a function of biasing means for biasing the rotor shaft toward the other end in the axial direction.

Japanese Patent Application Laid-Open No. 2005-304111

However, in the above-described conventional motor, the stopper is attached to the bearing by engaging with an annular groove formed on the outer peripheral surface of the bearing, so that the stopper rotates around the bearing. Generally, due to the dimensional tolerance of each part, the elastic piece (44) abuts obliquely on one end of the rotor shaft (11). force the rotor shaft in the radial direction as well. Such biasing of the stop prevents rattling of the rotor shaft in the direction of the motor axis as the rotor shaft rotates. However, when the stopper rotates around the bearing, the elastic piece that abuts one end of the rotor shaft also rotates, changing the direction of the biasing force in the radial direction perpendicular to the axial direction. Therefore, in the conventional motor described above, when the direction of the biasing force exerted by the stopper in the radial direction changes, the motor characteristics are affected and changed.

The present invention was made to solve such problems,
A rotor provided with a permanent magnet on the outer circumference of a rotating shaft, a stator arranged on the outer circumference side of the rotor, a bearing that rotatably supports the rotating shaft, a bearing holding member that holds the bearing, and a rotor supported by the bearing A motor comprising a biasing member that biases one end of the shaft toward the other end of the rotating shaft in the axial direction of the rotating shaft,
The urging member is attached to a side surface of the bearing holding member by a bearing, and the bearing holding member is provided with a rotation restricting portion that regulates rotation of the urging member on a side surface around the urging member. .

According to this configuration, even if the biasing member tries to rotate on the side surface of the bearing holding member, the rotation of the biasing member is restricted by the rotation restricting portion provided around the biasing member on the side surface of the bearing holding member. be. Therefore, the biasing member obliquely abuts on one end of the rotary shaft, and the direction of the biasing force in the direction crossing the axial direction of the rotary shaft does not change when the biasing member rotates as in the conventional art. . Therefore, the motor characteristics are not changed by changing the direction of the biasing force of the biasing member in the direction intersecting with the axial direction of the rotating shaft as in the conventional art, and the motor characteristics are kept constant. be able to

Further, according to the present invention, the biasing member has a notch portion fitted to the outer periphery of the bearing formed in the end plate portion that abuts on the bearing holding member, and the notch portion is fitted to the outer periphery of the bearing. The relative position with respect to the bearing in the width direction of the end plate portion sandwiching is defined,
The rotation restricting portion is provided on the side surface of the bearing holding member with a predetermined gap between it and the outer circumference of the end plate portion in the width direction.

When the notched portion of the end plate portion is fitted to the outer periphery of the bearing and the biasing member is attached to the bearing, the mounting position of the biasing member to the bearing in the plane direction of the side surface of the bearing holding member depends on the dimensional tolerance of each part. changes in the width direction of the end plate portion. However, according to this configuration, the rotation restricting portion is provided on the side surface of the bearing holding member with a predetermined gap from the outer periphery in the width direction of the end plate portion. Therefore, when the biasing member is attached to the bearing, even if the mounting position of the biasing member relative to the bearing changes in the width direction of the end plate portion, the biasing member will not collide with the rotation restricting portion. Instead, the notch is guided along the outer circumference of the bearing to define the relative position of the end plate with respect to the bearing in the width direction.

Further, according to the present invention, the rotation restricting portion is provided on the side surface of the bearing holding member along a direction in which the notch portion is guided from a predetermined direction in the surface direction of the side surface of the bearing holding member to the outer periphery of the bearing,
The notched portion of the biasing member is fitted to the outer periphery of the bearing from the predetermined direction, thereby defining the relative position of the end plate portion with respect to the bearing in the width direction,
The bearing holding member is provided with an obstructing portion on the side surface thereof for preventing the cutout portion from being fitted to the outer circumference of the bearing from a direction opposite to the predetermined direction.

According to this configuration, the urging member is guided by the rotation restricting portion provided along the predetermined direction on the side surface of the bearing holding member, so that the cutout portion is pushed from the outer circumference of the bearing from the predetermined direction. fit in. However, in the urging member, the obstruction provided on the side surface of the bearing holding member prevents the notch from fitting into the outer periphery of the bearing from the direction opposite to the predetermined direction. Therefore, the orientation of attachment of the biasing member to the bearing is restricted to a certain orientation. Therefore, the state in which the biasing member obliquely contacts one end of the rotating shaft does not change depending on the mounting direction of the biasing member with respect to the bearing, and the biasing member in the direction intersecting the axial direction of the rotating shaft does not change. The direction of the biasing force is always kept constant. Therefore, the motor characteristics do not change depending on the mounting orientation of the biasing member with respect to the bearing.

Further, in the present invention, the biasing member is attached to the side surface of the bearing holding member by the bearing, with the end plate portion that abuts on the bearing holding member being sandwiched between the bearing holding member and a step provided on the bearing. characterized by

In this configuration, the mounting position of the urging member in the rotation axis direction changes within the range of only the dimensional tolerance of the step provided in the bearing. Therefore, according to this configuration, the mounting position of the biasing member in the direction of the rotating shaft has less room to change than in the conventional art, and the variation in the biasing force exerted by the biasing member on the rotating shaft is less than in the conventional art. suppressed by Therefore, the motor characteristics can be kept stable and constant compared to the conventional art.

Further, according to the present invention, the bearing is formed of a large-diameter cylindrical portion and a small-diameter cylindrical portion. The large-diameter cylindrical portion sandwiches the end plate portion between the step and the bearing holding member by crushing the end portion of the large-diameter cylindrical portion to a diameter larger than that of the hole.

According to this configuration, the bearing can be manufactured only by processing using a mold that moves in its axial direction, that is, without cutting. Therefore, the manufacturing cost of the motor can be reduced.

Moreover, the present invention is characterized in that the bearing holding member is formed from a plate-like member fixed to the side surface of the stator.

According to this configuration, the bearing holding member can be manufactured easily. Therefore, the manufacturing cost of the motor can be reduced also by this configuration.

According to the present invention, it is possible to provide a motor that maintains constant motor characteristics without changing the direction of the biasing force of the biasing member in the direction that intersects the axial direction of the rotating shaft.

1 is an external perspective view of a stepping motor according to one embodiment of the present invention; FIG. (a) is a front view of the stepping motor shown in FIG. 1, and (b) is a plan view. (a) is a side view of the stepping motor shown in FIG. 1, and (b) is a sectional view. It is a partially expanded sectional view of the sectional view shown in FIG.3(b).

Next, a mode for carrying out the present invention when the motor according to the present invention is applied to a stepping motor will be described.

In the following description, of the direction of the motor axis L, which is the axial direction of the rotating shaft 2, the side where the rotating shaft 2 protrudes from the stator 5 is defined as the output side L1, and the rotating shaft 2 protrudes from the stator 5. The side opposite to the side will be described as the anti-output side L2. The output side L1 is the side from which the rotational output of the rotary shaft 2 is extracted.

(overall structure)
FIG. 1 is an external perspective view of a stepping motor 1 according to one embodiment of the present invention. 2(a) is a front view of the stepping motor 1, FIG. 2(b) is a plan view, FIG. 3(a) is a side view, and FIG. 3(b) is a sectional view.

The stepping motor 1 is used, for example, to drive an optical head in an optical disc drive device for DVDs, Blu-ray discs, etc., or to drive a mirror in a HUD (head-up display) that reflects information on a mirror and displays it on the front window of a car. , and as shown in FIG. there is

(Stator configuration)
The stator 5 is configured in a cylindrical shape, and the rotor 4 is arranged coaxially with the stator 5 with the motor axis L as the center in the radial direction inside the stator 5 . The stator 5 is configured by stacking a first stator set 51 and a second stator set 52 in the motor axis L direction. The first stator set 51 includes a coil 6a wound around the cylindrical body of the first bobbin 7a, and an outer stator core 8a and an inner stator core 9a arranged on both sides of the coil 6a in the motor axis L direction. consists of The second stator set 52 includes a coil 6b wound around the cylindrical body of the second bobbin 7b, and an outer stator core 8b and an inner stator core 9b arranged on both sides of the coil 6b in the direction of the motor axis L. consists of

The outer stator core 8a, the inner stator core 9a, and the outer stator core 8b, the inner stator core 9b are each made of a magnetic material. The first stator set 51 and the second stator set 52 are surrounded by the outer stator cores 8a and 8b by welding the abutting portions of the outer stator cores 8a and 8b, which also serve as cases. are fixed together.

Each of the outer stator cores 8a, 8b has a plurality of pole teeth projecting toward each other in the direction of the motor axis L. As shown in FIG. In addition, each of the inner stator cores 9a and 9b has a plurality of pole teeth that protrude away from each other in the motor axis L direction. On the inner peripheral surface of the cylindrical body of the first bobbin 7a, a plurality of pole teeth of the outer stator core 8a and the inner stator core 9a are arranged in the circumferential direction, and the coil 6a wound around the bobbin 7a rotates around these pole teeth. go around. A plurality of pole teeth of the outer stator core 8b and the inner stator core 9b are arranged in the circumferential direction on the inner peripheral surface of the cylindrical body of the second bobbin 7b, and the coil 6b wound around the bobbin 7b is arranged between these pole teeth. orbit around.

In this embodiment, the first bobbin 7a and the second bobbin 7b are made of a resin insulating member, and have flanges on both sides of the cylindrical body. Terminal blocks 7a1 and 7b1 are formed integrally with the flange portions of the first bobbin 7a and the second bobbin 7b. Two terminal pins 10 are press-fitted and fixed to each of the terminal blocks 7a1 and 7b1. Each terminal pin 10 is wrapped around the ends of the coils 6a and 6b at the start and end of the wire. These terminal blocks 7a1 and 7b1 are formed at the same angular position on the bobbins 7a and 7b, and overlap each other when viewed from the direction of the motor axis L. It protrudes outside the stator cores 8a and 8b.

(Rotor configuration)
The rotating shaft 2 of the rotor 4 extends in the direction of the motor axis L and is made of a metal material such as stainless steel or brass. A spiral groove (not shown) is formed on the outer peripheral surface of the rotating shaft 2 on the side (output side L1) protruding from the stator 5 . A substantially cylindrical permanent magnet 3 is fixed around the rotating shaft 2 with an adhesive at a position near the output side L2 of the rotating shaft 2 . The rotating shaft 2 constitutes a rotation-linear conversion mechanism together with a rack (not shown). The permanent magnet 3 is a bonded magnet in which magnet particles are mixed in a binder made of a polymer material.

The permanent magnet 3 has a shape composed of a pair of large-diameter portions 3a and 3b located on both sides in the direction of the motor axis L and a small-diameter portion 3c in the center thereof. The outer peripheral surface of one large-diameter portion 3a faces the pole teeth of the outer stator core 8a and the inner stator core 9a of the first stator set 51 with a predetermined gap therebetween. The outer peripheral surface of the other large-diameter portion 3b is radially inside the outer stator core 8b and the inner stator core 9b of the second stator set 52 and faces the pole teeth thereof with a predetermined gap therebetween.

(Bearing structure)
The connecting plate portion 21a of the plate 21 is fixed by welding or the like to the end surface of the outer stator core 8a constituting the first stator set 51 on the output side L1. Plate 21 is made of metal. As shown in FIG. 1, an output-side L1 bearing mechanism that rotatably supports the output-side L1 end of the rotating shaft 2 is formed in the tip-side bent portion 21b of the plate 21 . On the other hand, a disc-shaped end plate 31 is fixed by welding or the like to the end face of the outer stator core 8b constituting the second stator set 52 on the counter-output side L2. The end plate 31 is used to hold a bearing mechanism on the non-output side L2 that rotatably supports the end of the rotating shaft 2 on the non-output side L2.

In the bearing mechanism on the anti-output side L2, a bearing 32 is provided in a hole 31a formed in the center of the end plate 31. As shown in FIG. The end plate 31 constitutes a bearing holding member that holds the bearing 32, and is formed of a plate-like member fixed to the side surface of the outer stator core 8b on the counter-output side L2. The bearing 32 rotatably supports the end of the rotary shaft 2 on the counter-output side L2 coaxially with the rotor 5 . The end of the rotating shaft 2 on the counter-output side L2 is supported by a bearing 32 and is configured to be movable in the direction of the motor axis L. As shown in FIG.

The biasing member 33 includes a rectangular end plate portion 33a that abuts against the surface of the end plate 31 on the non-output side L2, and a plate spring portion 33b that is bent from one side of the end plate portion 33a toward the non-output side L2. have. The end plate portion 33a is formed with a semicircular notch portion 33e fitted to the outer periphery of the bearing 32, and both sides of the end plate portion 33a sandwiching the notch portion 33e are cut and raised toward the counter-output side L2. A folded portion 33c is formed. A pair of retaining portions 33d (see FIG. 2A) projecting toward the inner diameter of the circle are formed on both sides of the cutout portion 33e on the open side of the semicircular cutout portion 33e. When the urging member 33 is about to be removed from the outer circumference of the bearing 32, the retaining portion 33d hits the outer circumference of the bearing 32 and generates a force countering the removing force. In the urging member 33, the cutout portion 33e is fitted to the outer periphery of the bearing 32, so that the relative position of the end plate portion 33a sandwiching the cutout portion 33e with respect to the bearing 32 in the width direction is defined. is mounted by bearings 32 on the

As shown in a partially enlarged view in FIG. 4, the bearing 32 is formed of a large-diameter cylindrical portion 32a and a small-diameter cylindrical portion 32b. A step 32c is formed in an annular shape. The biasing member 33 has a small-diameter cylindrical portion 32b press-fitted into a hole 31a provided in the center of the end plate 31, so that the large-diameter cylindrical portion 32a moves the end plate portion 33a between the step 32c and the end plate 31. sandwiched. The end plate portion 33a of the biasing member 33 is formed between the step 32c and the end plate 31 by squeezing the end portion of the small-diameter cylindrical portion 32b projecting from the hole 31a to a diameter larger than that of the hole 31a by caulking or the like. You may comprise so that it may pinch. In this way, the biasing member 33 is held between the end plate 31 and the step 32c provided on the bearing 32 at the end plate portion 33a that abuts on the end plate 31. installed.

In addition, the end face of the leaf spring portion 33b on the output side L1 is in contact with the tip of the end portion of the rotation shaft 2 on the counter-output side L2, and the rotation shaft 2 moves toward the output side L1 due to the elasticity of the leaf spring portion 33b. is biased toward As shown in FIG. 4, the plate spring portion 33b is slightly inclined toward the non-output side L2 due to the dimensional tolerance of each part, and abuts on the tip of the end of the rotary shaft 2 on the non-output side L2. Therefore, the leaf spring portion 33b urges one end of the rotating shaft 2 supported by the bearing 32 in the direction of the motor axis L toward the other end of the rotating shaft 2 in the direction A. One end of the rotating shaft 2 is also urged in a direction B orthogonal to .

The bearing mechanism on the output side L1 is also constructed in the same manner as the bearing mechanism on the counter-output side L2. That is, as shown in FIG. 1, the tip-end bent portion 21b of the plate 21 holds the bearing 35 on the output side L1. In this embodiment, the bearing 35 is made of resin and supports the end of the rotary shaft 2 on the output side L1 coaxially with the rotor 5 so as to be rotatable. The end of the rotating shaft 2 on the output side L1 is rotatably supported by a bearing 35 and restricted from moving toward the output side L1. Therefore, the rotary shaft 2 is biased by the plate spring portion 33b so that the end of the output side L1 abuts the bearing member 35, so that when the rotary shaft 2 rotates, the motor of the rotary shaft 2 Shaking in the direction of the axis L is prevented.

(Rotation restriction structure of biasing member)
The end plate 31 is provided with a rotation restricting portion 31 b that restricts the rotation of the biasing member 33 on the side surface around the biasing member 33 . In the present embodiment, the rotation restricting portion 31b guides the notch portion 33e of the end plate portion 33a from a predetermined direction C (see FIG. 2A) in the surface direction of the side surface of the end plate 31 toward the outer periphery of the bearing 32. A pair of parallelepiped-shaped end plates 31 are provided on the side surface of the end plate 31 along the . Each of these rotation restricting portions 31b is provided on the side surface of the end plate 31 with a predetermined gap s between it and the outer circumference of the end plate portion 33a in the width direction. The notch 33e of the end plate portion 33a of the urging member 33 is fitted to the outer periphery of the bearing 32 from the predetermined direction C, so that the relative position of the end plate portion 33a with respect to the bearing 32 in the width direction is defined. Further, the end plate 31 has an obstacle portion 31c which prevents the notch portion 33e of the end plate portion 33a from being fitted to the outer periphery of the bearing 32 from the direction D opposite to the predetermined direction C. is provided so as to protrude from the side surface of the The obstructing portion 31c only needs to prevent the notch portion 33e of the end plate portion 33a from being fitted to the outer periphery of the bearing 32 from the direction D opposite to the predetermined direction C, and is limited to the shape and formation position shown in the figure. not to be

(Actions and effects of the embodiment)
According to the stepping motor 1 of the present embodiment, even if the biasing member 33 tries to rotate on the side surface of the end plate 31, the rotation restricting portion provided around the biasing member 33 on the side surface of the end plate 31 The rotation of the biasing member 33 is restricted by 31b. Therefore, the leaf spring portion 33b of the biasing member 33 obliquely contacts one end of the rotary shaft 2, and the biasing force of the biasing member 33 in the direction B intersecting the axial direction of the motor axis L is It does not change by rotating the biasing member 33 as in the conventional art. Therefore, unlike the conventional art, the motor characteristics of the stepping motor 1 do not change due to the change in the direction B of the biasing force of the biasing member 33 in the direction intersecting the axial direction of the motor axis L. The motor characteristics of the stepping motor 1 are kept constant.

Moreover, when the notch 33e of the end plate portion 33a is fitted to the outer periphery of the bearing 32 and the biasing member 33 is attached to the bearing 32, the biasing member 33 is The mounting position changes in the width direction of the end plate portion 33a depending on the dimensional tolerance of each part. However, according to the stepping motor 1 according to the present embodiment, the rotation restricting portion 31b is provided on the side surface of the end plate 31 with a predetermined gap s between it and the outer circumference of the end plate portion 33a in the width direction. there is Therefore, when the biasing member 33 is attached to the bearing 32, even if the mounting position of the biasing member 33 with respect to the bearing 32 changes in the width direction of the end plate portion 33a, the biasing member 33 is The cutout portion 33e is guided to the outer periphery of the bearing 32 without colliding with the rotation restricting portion 31b, and the position of the end plate portion 33a relative to the bearing 32 in the width direction is defined.

Further, according to the stepping motor 1 according to the present embodiment, the biasing member 33 is guided to the rotation restricting portion 31b provided along the predetermined direction C on the side surface of the end plate 31 in the planar direction of the side surface of the end plate 31. The notch portion 33e is fitted to the outer circumference of the bearing 32 from the predetermined direction C. As shown in FIG. However, the urging member 33 is prevented from fitting the notch 33e to the outer periphery of the bearing 32 from the direction D opposite to the predetermined direction C by the obstacle 31c provided on the side surface of the end plate 31 . Therefore, the orientation of attachment of the biasing member 33 to the bearing 32 is restricted to a certain orientation. Therefore, the state shown in FIG. 4 in which the biasing member 33 abuts obliquely on one end of the rotary shaft 2 does not change depending on the mounting direction of the biasing member 33 with respect to the bearing 32, and intersects the motor axis L in the axial direction. The direction B of the urging force by the urging member 33 in the direction to pull is always kept constant. Therefore, the motor characteristics of the stepping motor 1 do not change depending on the mounting orientation of the biasing member 33 with respect to the bearing 32 .

Further, in the conventional motor disclosed in Patent Document 1, the mounting position in the axial direction of the rotor shaft of the stopper corresponding to the biasing member 33 is the formation position in the axial direction of the rotor shaft into which the stopper is fitted. It varies within the range of the sum of the dimensional tolerances of the groove width and the thickness of the end surface of the case. On the other hand, in the stepping motor 1 according to the present embodiment, the mounting position of the biasing member 33 in the direction of the motor axis L is such that the end plate portion 33a is pushed by the step 32c and comes into contact with the end plate 31 once. Therefore, it changes within the range of the dimensional tolerance of the height of the step 32c provided in the bearing 32. Therefore, according to the stepping motor 1 of the present embodiment, the mounting position of the biasing member 33 in the direction of the motor axis L has less room to change than in the conventional art, and the biasing member 33 acts on the rotating shaft 2. Fluctuations in the biasing force are suppressed compared to the conventional art. Therefore, the motor characteristics of the stepping motor 1 can be kept more stable and constant than in the prior art.

In addition, in the conventional motor disclosed in Patent Document 1, manufacturing of the bearing requires sintering using a mold that is moved in the axial direction, and cutting for forming grooves on the outer circumference of the bearing. be. However, according to the stepping motor 1 according to the present embodiment, the bearing 32 can be manufactured only by sintering using a mold that moves in its axial direction, that is, without cutting. Therefore, the manufacturing cost of the stepping motor 1 can be reduced.

Further, according to the stepping motor 1 according to the present embodiment, the end plate 31 is formed from a disk-shaped plate-like member, so that the end plate 31 can be manufactured easily. Therefore, the manufacturing cost of the stepping motor 1 can be reduced also by this configuration.

(Modification)
In this embodiment, the case where the bearing holding member holding the bearing 32 is the end plate 31 separate from the outer stator 8b has been described. However, the bearing holding member is not limited to this. For example, a cup-shaped case that also functions as a stator is used as the bearing holding member, and a hole corresponding to the hole 31a is formed in the cup-shaped case so that the bearing 32 may be configured to be fixed in this hole.

Although the present invention is applied to the stepping motor in the above embodiment, the present invention may be applied to motors other than the stepping motor.

DESCRIPTION OF SYMBOLS 1... Stepping motor 2... Rotating shaft 3... Permanent magnet 3a, 3b... Large diameter part 3c... Small diameter part 4... Rotor 5... Stator 51... First stator group 52... Second stator group, 6a, 6b... coil, 7a, 7b... bobbin, 7a1, 7b1... terminal block, 8a, 8b... outer stator core, 9a, 9b... inner stator core, 10... terminal pin, 21... plate, 21a... connecting plate portion, 21b... Tip side bent portion 31 End plate (bearing holding member) 31a Hole 31b Rotation restricting portion 31c Obstruction portion 32, 35 Bearing 32a Large diameter cylindrical portion 32b Small diameter cylindrical portion 33 Biasing member 33a End plate portion 33b Plate spring portion 33c Return portion 33d Retaining portion 33e Notch portion s Gap C Predetermined direction D Opposite to C the direction of

Claims (6)

A rotor provided with a permanent magnet on the outer circumference of a rotating shaft, a stator arranged on the outer circumference side of the rotor, a bearing rotatably supporting the rotating shaft, a bearing holding member holding the bearing, and the bearing A motor comprising a biasing member that biases one end of the supported rotating shaft toward the other end of the rotating shaft in the axial direction of the rotating shaft,
the biasing member is attached to a side surface of the bearing holding member by the bearing;
The bearing holding member is provided with a rotation restricting portion that restricts rotation of the biasing member on the side surface around the biasing member,
The urging member has a cutout portion that fits on the outer circumference of the bearing. A relative position with respect to the bearing in the width direction of the end plate portion sandwiching is defined,
The motor according to claim 1, wherein the rotation restricting portion is provided on the side surface with a predetermined gap from the outer circumference of the end plate portion in the width direction. A rotor provided with a permanent magnet on the outer circumference of a rotating shaft, a stator arranged on the outer circumference side of the rotor, a bearing rotatably supporting the rotating shaft, a bearing holding member holding the bearing, and the bearing A motor comprising a biasing member that biases one end of the supported rotating shaft toward the other end of the rotating shaft in the axial direction of the rotating shaft,
the biasing member is attached to a side surface of the bearing holding member by the bearing;
The bearing holding member is provided with a rotation restricting portion that restricts rotation of the biasing member on the side surface around the biasing member,
The biasing member is attached to a side surface of the bearing holding member by the bearing, with an end plate portion that abuts against the bearing holding member being sandwiched between a step provided on the bearing and the bearing holding member. A motor characterized by: The rotation restricting portion is provided on the side surface along a direction in which the cutout portion is guided from a predetermined direction in the surface direction of the side surface to the outer circumference of the bearing,
The notched portion of the biasing member is fitted to the outer periphery of the bearing from the predetermined direction, thereby defining a relative position of the end plate portion with respect to the bearing in the width direction,
2. The motor according to claim 1 , wherein the bearing holding member is provided with an obstructing portion on the side surface that prevents the cutout portion from being fitted to the outer circumference of the bearing from a direction opposite to the predetermined direction. . The biasing member is attached to a side surface of the bearing holding member by the bearing, with an end plate portion that abuts against the bearing holding member being sandwiched between a step provided on the bearing and the bearing holding member. 4. The motor according to claim 1 or 3, characterized by: The bearing is formed of a large-diameter cylindrical portion and a small-diameter cylindrical portion. 5. The motor according to claim 4, wherein the large-diameter cylindrical portion sandwiches the end plate portion between the step and the bearing holding member by crushing the end portion to a diameter larger than that of the hole. . 6. The motor according to any one of claims 1 to 5, wherein the bearing holding member is formed of a plate member fixed to a side surface of the stator.

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