JP2015192536A - Motor and armature for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration reduced/noise reduced motor and an armature for the motor.SOLUTION: The armature for the motor includes: a plurality of armature coils disposed at equal angle intervals and a rectifier part 20 provided on a rotary shaft adjacently to the armature coils. The rectifier part includes: an insulation core 21 fitted to a rotary shaft 11; a plurality of rectifier pieces 22 disposed at equal angle intervals in a peripheral direction along a circumferential surface of the insulation core; and a midpoint member 24 formed from an annular conductive material disposed outside the rectifier pieces via an annular insulation member 23. Each of the rectifier pieces includes a rectifier hook 22b which extends in parallel with the rotary shaft along a surface of the insulation core and protrudes outside from an outer edge of the rectifier piece. The midpoint member includes a plurality of midpoint hooks 24b extending in parallel with the rotary shaft along a surface of the insulation member and protruding outside at equal angle intervals in a peripheral direction. Winding terminals of the armature coils are electrically connected to the rectifier hooks or the midpoint hooks by spot welding respectively.

Description

  The present invention relates to a motor such as an in-vehicle motor, and more particularly to a structure of an armature thereof.

Conventionally, such a motor is configured as shown in, for example, a winding method of a Y-connection armature of a small motor according to Patent Document 1.
That is, the small motor shown in Patent Document 1 includes a rotor having three-pole coils arranged at equiangular intervals in the circumferential direction with respect to the rotation axis, and a two-pole arranged to surround the rotor. It consists of a field.

The rotor includes an iron core that is fitted into a rotating shaft, and the iron core is constituted by three armature poles that are arranged at equal angular intervals in the circumferential direction with respect to the central axis.
Each armature pole is divided by a slot formed in the iron core, and a coil is formed by winding a winding between the slots.

Furthermore, the rotor includes three commutators arranged at equal angular intervals in the circumferential direction adjacent to the iron core with respect to the rotation axis.
Each commutator is attached to the outer periphery of an insulating cylinder attached to the rotating shaft, and has a tongue on the outer peripheral portion.
Thereby, these tongues are arranged at equiangular intervals in the circumferential direction with respect to the rotation axis.

Further, the rotor includes an annular common terminal plate disposed outside each commutator via an insulating annular member.
The common terminal plate is formed of a flat plate, extends substantially perpendicular to the rotation axis, and includes three tangs arranged at equiangular intervals in the circumferential direction on the outer peripheral portion thereof.
Here, the tongue of each commutator and the tongue of the common terminal plate are configured to be alternately arranged at substantially equal angular intervals in the peripheral direction.

  And the coil formed in each armature pole is electrically connected by soldering to the tongue of the commutator and the tongue of the common terminal plate to which the winding terminals respectively correspond. As a result, a so-called Y-connection armature is formed.

According to the motor having such a configuration, power is supplied from the outside to each commutator and the common terminal plate, whereby a current flows through each coil and magnetism is generated.
As a result, the rotational driving force acts on the rotor due to the interaction between the magnetism generated in each coil and the magnetism of the surrounding field, and the rotor rotates.

Japanese Patent No. 2875030

By the way, in such motors, particularly in-vehicle motors, more specifically, for example, in-vehicle air conditioner control motors and mirror retracting motors, noise and vibration during operation are contrary to improvement in the quietness of the automobile. Therefore, it is required to reduce noise and vibration during operation.
However, in the motor having the above-described configuration, the winding terminal of each coil is soldered to the corresponding commutator and the tongue of the common terminal plate. For this reason, variations such as the soldering position and the solder amount occur, and the dynamic balance of the armature is lost. Therefore, when the armature rotates, the center of gravity shifts from the center of rotation, so that vibration and noise due to motor rotation occur. In addition, the time required for soldering is relatively long, and mass productivity is impaired.

On the other hand, it is possible to cope with low noise and low vibration by, for example, armature hexapole, field quadrupole, armature Δ connection, etc. The cost is greatly increased due to a significant increase in winding and assembly man-hours.
A method of spot welding the winding end of each coil to the tongue is also conceivable. However, since the common terminal plate is composed of a flat plate perpendicular to the rotation axis, the common terminal plate is made of an electrode for spot welding. It is difficult to chuck, and it is actually impossible to perform spot welding.

  In view of the above points, the present invention can improve the rotation balance and reduce the vibration and noise by spot welding the coil winding terminal of the armature with a simple configuration. An object of the present invention is to provide a motor and an armature for the motor.

  According to the first configuration of the present invention, the object is to provide a plurality of armature coils arranged at equiangular intervals with respect to the rotating shaft, and a commutator portion provided on the rotating shaft adjacent to the armature coil. And a commutator portion that is fitted on the rotating shaft, a plurality of commutator pieces that are arranged at equiangular intervals in the circumferential direction along the peripheral surface of the insulating core portion, and a rectifier A midpoint member made of an annular conductive material disposed on the outside of the child piece via an annular insulating member, and each commutator piece is parallel to the rotation axis along the surface of the insulating core. And a commutator hook that protrudes outward from the outer peripheral edge thereof, and the midpoint member extends parallel to the rotation axis along the surface of the insulating member and is equiangular in the circumferential direction. Armature coil winding end with multiple midpoint hooks projecting outward at intervals One is electrically connected to the corresponding commutator hook by spot welding, and the other of the winding terminals is electrically connected to the corresponding midpoint hook by spot welding. This is achieved by a motor armature.

According to the above configuration, since the winding terminal of the armature coil is electrically connected to the corresponding commutator hook and the midpoint hook by spot welding, compared with the case of connection by conventional soldering. As a result, the dynamic balance of the armature is improved, the generation of vibration and noise during the rotation of the armature is suppressed, the process time is shortened, and the mass productivity is improved.
Here, since the midpoint member extends along the surface of the insulating member in parallel with the rotation axis, the area of the midpoint member must be pressed from the periphery over a wide area when performing spot welding. Is possible. Therefore, energization from the electrode at the time of spot welding becomes sufficient, and spot welding is reliably performed.
Further, since the commutator piece extends in parallel to the rotation axis along the surface of the insulating core portion as in the conventional case, as in the case of the midpoint member, in the case of spot welding, a chuck also serving as an electrode However, spot welding is reliably performed by press-contacting in a wide area of the commutator piece.

The motor armature according to the present invention is preferably such that each commutator hook and each midpoint hook are curved in the radial direction with respect to the rotation axis, and correspond to the inside of the curved portion during spot welding. The winding terminal is clamped by being pressed from the outside in the radial direction in a state where the winding terminal is inserted.
According to this configuration, when the winding terminal is inserted inside the curved portion of the commutator hook or the midpoint hook, the curved portion is crushed in the radial direction when the electrode contacts from the radially outer side. The winding terminal is sandwiched, and the coating of the winding terminal is melted by energization from the electrode, and the winding terminal is fused and integrated with the commutator hook or the midpoint hook to be electrically connected. Become.

The motor armature according to the present invention is preferably characterized in that each commutator hook is engaged with an engaging portion provided in the insulating core portion so as not to move in the circumferential direction. To do.
In the motor armature according to the present invention, preferably, the midpoint hooks are engaged with the engaging portions provided on the insulating core portions so as not to move in the circumferential direction. .
According to these configurations, the commutator hook and the midpoint hook are locked with respect to the circumferential direction by the engaging portion even when the armature tries to rotate around the rotation shaft during spot welding or use after completion. Therefore, there will be no misalignment in the circumferential direction.

  According to the second configuration of the present invention, the object is to support the rotating shaft, the armature attached to the rotating shaft, the field arranged so as to surround the armature, and the rotating shaft rotatably. The motor is characterized in that the armature is any one of the armatures for motors described above.

  According to the above configuration, since the winding end of the armature coil is electrically connected to the commutator piece and the midpoint member by spot welding, the motor is compared with the case of connection by conventional soldering. Generation of vibration and noise during operation is suppressed.

  Thus, according to the present invention, with a simple configuration, spot welding is performed on the coil winding terminal of the armature, thereby improving the rotation balance and realizing low vibration and low noise. It is possible to provide a motor and an armature for the motor.

It is a schematic side view which shows the structure of one Embodiment of the motor by this invention. FIG. 2A is an enlarged cross-sectional view and FIG. 2B is an enlarged front view showing a main part configuration of an armature in the motor of FIG. 1. It is (A) enlarged side view, (B) enlarged front view, and (C) XX expanded sectional view which shows the structure of the insulation core part which comprises the commutator part in the armature of FIG. (A) Enlarged side view, (B) Enlarged sectional view, (C) Enlarged view, and (D) Attached state to the insulating core portion showing the configuration of the commutator piece constituting the commutator portion in the armature of FIG. It is an enlarged front view which shows. It is (A) enlarged front view and (B) sectional drawing which show the structure of the insulating member which comprises the commutator part in the armature of FIG. 3A is an enlarged front view showing a configuration of a midpoint member constituting a commutator portion in the armature of FIG. 2, FIG. 3B is an enlarged front view, and FIG. 3C is an enlarged front view in a state where a commutator hook is developed. . FIGS. 3A and 3B are process diagrams sequentially illustrating an assembly process of a commutator portion in the armature of FIG. 2, in which FIG. 3A is a state in which a commutator piece is incorporated in an insulating core portion, and FIG. The assembled state, and (C) shows a state in which a midpoint member is assembled around the insulating member. FIG. 3 is an enlarged cross-sectional view showing spot welding of a commutator portion in the armature of FIG. 2, wherein (A) is a step of spot welding a coil winding terminal to a commutator hook, and (B) is a coil winding terminal to a midpoint hook. Shows a step of spot welding. FIG. 3A is a connection diagram illustrating a connection state between a commutator portion and each coil winding in the armature of FIG. 2, and FIG. 3B is a development view illustrating a connection state between each coil and a commutator hook and a midpoint hook. It is an expanded sectional view which shows the state after the connection of the coil | winding terminal of the commutator part in the armature of FIG. It is an enlarged front view which shows the state after the connection of the coil | winding terminal of the commutator part in the armature of FIG.

Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.
In FIG. 1, a motor 10 supports a rotating shaft 11, an armature 12 attached to the rotating shaft 11, a field 13 disposed so as to surround the armature 12, and the rotating shaft 11 rotatably. The rotary shaft 11 and the armature 12 are accommodated in a casing 16.

  The rotating shaft 11 extends through the armature 12, and both ends thereof are rotatably supported by bearings 14 and 15, respectively.

In the casing 16, the armature 12 includes an iron core 12a fixed to the rotating shaft 11, and a plurality (three in the illustrated case) of armature coils 12b in which coil windings are wound around the iron core. ing.
The armature coils 12b are arranged at equiangular intervals with respect to the iron core 12a having a three-pole configuration.

The armature 12 includes a commutator portion 20 that is attached to the rotating shaft 11 adjacent to the iron core 12a.
The commutator portion 20 is configured as a so-called slip ring as will be described later, and a pair of brushes 17 and 18 attached to the casing 16 side are pressed against a surface extending in the circumferential direction of the commutator portion 20. Has been.
Here, the brush 17 is connected to the positive side of the driving power source, and the brush 18 is connected to the negative side of the driving power source.

The field 13 is fixed in the casing 16 so as to surround the armature 12 from the outside in the radial direction with respect to the center of the rotating shaft 11.
In the case of illustration, the field magnet 13 is composed of a pair of magnets arranged vertically within the casing 16.

  The above configuration is substantially the same as that of the conventional motor. However, in the motor 10 according to the present invention, the configuration of the armature 12, particularly the commutator portion 20 is different as shown below.

  That is, as shown in FIG. 2, the commutator 20 includes an insulating core 21 fitted on the rotating shaft 11, a commutator piece 22 disposed on the outer periphery of the insulating core 21, and a commutator piece 22. The insulating member 23 is mounted on the outer side, and the midpoint member 24 is disposed on the outer side of the insulating member 23.

The insulating core portion 21 is made of an insulating material. As shown in FIG. 3, the insulating core portion 21 includes a cylindrical portion 21a on one side (right side of the drawing) and an enlarged portion 21b adjacent to the cylindrical portion 21a. I have.
The enlarged portion 21b includes an engagement recess 21c for receiving the hook portion 22b of the commutator piece 22 disposed on the cylindrical portion 21a and an engagement hole for receiving the end of the commutator piece 22, as will be described later. 21d.
In the illustrated case, the engagement recess 21c and the engagement hole 21d are provided at three positions at equal angular intervals on the outer periphery of the enlarged portion 21b in accordance with the number of commutator pieces 22.
In addition, the outer periphery of the enlarged portion 21b is provided with a flat portion 21e for allowing the commutator hook 22b of the commutator piece 22 and the midpoint hook 24b of the midpoint member 24 to come into contact from the outside in the radial direction.

The commutator piece 22 is made of a conductive material, and is curved in a cylindrical shape arranged along the surface of the cylindrical portion 21a of the insulating core portion 21 as shown in FIGS. And a commutator hook 22b that rises slightly from the inner side to the outer side in the radial direction from one end (the left end in FIG. 4A) of the main body portion 22a.
That is, one end of the main body 22a has an extension 22c that extends slightly to the left beyond the rising position of the commutator hook 22b.
The commutator hook 22b is formed to be bent so that the intermediate portion protrudes to one side.

After the commutator piece 22 having such a shape is formed as shown in the developed view of FIG. 4C, the main body portion 22a is curved into a cylindrical surface, and the commutator hook 22b is bent outward in the radial direction. And bent so as to protrude further toward one side.
Then, as shown in FIG. 4D, the three commutator pieces 22 form gaps at equal angular intervals with respect to the circumferential direction with respect to the surface of the cylindrical portion 21a of the insulating core portion 21. Arranged. At this time, the commutator hook 22b of each commutator piece 22 engages with the engaging recess 21c of the insulating core portion 21 and contacts the flat portion 21e, and the extension portion 22c of each commutator piece 22 has the insulating core portion. 21 is fitted into the engagement hole 21d.

  As shown in FIG. 5, the insulating member 23 includes a hollow cylindrical main body 23 a that is short in the axial direction, and a protrusion 23 b that extends outward from one end of the main body 23 a. In the protrusion 23b, engagement recesses 23c for receiving the midpoint hooks 24b of the midpoint member 24 are formed at three positions at equal angular intervals around the projection 23b.

The midpoint member 24 is made of a conductive material, and as shown in FIG. 6, a hollow cylindrical main body 24a disposed along the outer peripheral surface of the main body 23a of the insulating member 23, and a main body 24a. And a midpoint hook 24b that rises radially outward from one end (the left end in FIG. 4B).
Like the commutator hook 22b described above, the midpoint hook 24b is formed to bend so that the intermediate portion protrudes to one side.

  As shown in the developed view of FIG. 6C, the midpoint member 24 having such a shape is bent so that each midpoint hook 24b rises substantially vertically from the main body 24a, and then each midpoint hook 24b. Is bent so as to protrude toward one side.

The insulating core portion 21, the commutator piece 22, the insulating member 23, and the midpoint member 24 are assembled as shown in FIG.
That is, as shown in FIG. 7A, first, three commutator pieces 22 are arranged at equiangular intervals around the cylindrical portion 21a of the insulating core portion 21. At this time, the main body portion 22a of each commutator piece 22 is in close contact with the cylindrical portion 21a of the insulating core portion 21, the extension portion 22c is fitted into the engagement hole 21d of the insulating core portion 21, and the commutator hook 22b. Engages with the engaging recess 21c provided in the enlarged portion 21b of the insulating core 21 and abuts on the flat portion 21e.
In addition, when using the angle position with respect to the rotating shaft 11 of the field magnet 13 and the brushes 17 and 18 arrange | positioned for (DELTA) connection as it is, a neutral point (namely, the most efficient position in both rotation directions of CW and CCW). Therefore, it is desirable to shift the mounting position of the commutator piece 22 by 30 degrees.

Subsequently, as shown in FIG. 7B, the insulating member 23 is fitted on the cylindrical portion 21 a of the insulating core portion 21 from the main body portion 22 a of each commutator piece 22. At this time, the insulating member 23 is in contact with the rising portion of the commutator hook 22 b of each commutator piece 22 in the axial direction adjacent to the enlarged portion 21 b of the insulating core portion 21.
Thereby, each commutator piece 22 is fixedly held to the insulating core portion 21 by the insulating member 23.

Finally, as shown in FIG. 7C, the midpoint member 24 is fitted on the outer peripheral surface of the insulating member 23. At this time, each midpoint hook 24b of the midpoint member 24 engages with an engagement recess 21c provided in the enlarged portion 21b of the insulating core portion 21 and abuts on the flat portion 21e.
In this way, the commutator 20 is assembled.
Here, in the commutator portion 20, each commutator hook 22b and each midpoint hook 24b are open toward the right in FIG. 7C, and can easily receive the winding terminal. ing.

Next, the assembly work of the armature 12 using such a commutator 20 will be described.
The iron core 12a and the commutator portion 20 constituting the armature 12 are mounted on the rotary shaft 11 in advance, and the coil winding 12c is wound around the iron core 12a, so that three armature coils are provided. 12b, and winding ends of the coil windings 12c of the armature coils 12b are disposed in the commutator hook 22b and the midpoint hook 24b, respectively.

From this state, as shown in FIG. 8A, first, a chuck 31 serving as an electrode having a known configuration approaches from one side (right side of the drawing) and proceeds to the region of the cylindrical portion 21a of the insulating core portion 21. By closing, the main body portion 22a of the commutator piece 22 is chucked from the periphery by the chuck 31.
At this time, since the main body portion 22a of the commutator piece 22 extends in the axial direction, the contact area of the chuck 31 with respect to the main body portion 22a of the commutator piece 22 is large. Will come into contact with each other.

Subsequently, the electrode 32 for spot welding approaches the region of the enlarged portion 21c of the insulating core portion 21 from three directions at equiangular intervals perpendicular to the rotating shaft 11, and the commutator hooks 22b of the respective commutator pieces 22 are connected. Each commutator hook 22b is crushed inward in the radial direction by abutting on the tip and further pressing. Thereby, the winding terminal of the armature coil 12b arrange | positioned in each commutator hook 22b is clamped in the said commutator hook 22b.
Thereafter, energization is performed between the chuck 31 and the electrode 32 at a predetermined voltage and a predetermined current, so that the insulation coating of the winding terminal sandwiched in each commutator hook 22b is dissolved and each commutator hook 22b is It is melted by the energizing current, and the conductor portion of the winding end and the commutator hook 22b are spot welded and electrically connected.

Next, as shown in FIG. 8B, the chuck 31 serving as an electrode approaches from one side (right side of the drawing), proceeds to the region of the insulating member 23, and is closed. The main body 24a of the member 24 is chucked from the periphery.
At this time, since the main body portion 24a of the midpoint member 24 extends in the axial direction, the contact area of the chuck 31 with respect to the main body portion 24a of the midpoint member 24 is large. Will come into contact with each other.

Subsequently, the spot welding electrode 32 approaches the region of the enlarged portion 21c of the insulating core portion 21 from three directions at equiangular intervals perpendicular to the rotation shaft 11, and the tip of each midpoint hook 24b of the midpoint member 24 The middle point hooks 24b are crushed inward in the radial direction by abutting and further pressing. Thereby, the winding terminal of the armature coil 12b arranged in each midpoint hook 24b is clamped in the midpoint hook 24b.
Thereafter, energization is performed between the chuck 31 and the electrode 32 at a predetermined voltage and a predetermined current, so that the insulation coating of the winding terminal held in each midpoint hook 24b is dissolved and the midpoint hook 24b is It is melted by the energizing current, and the conductor portion of the winding terminal and the midpoint hook 24b are spot welded and electrically connected.
Here, since the chuck 31 is in contact with the main body 24a of the midpoint member 24 over a wide area, spot welding is reliably performed.

In addition, the connection of each armature coil 12b of the armature 12 is performed as shown in FIG.
That is, as shown in FIG. 9A, among the winding terminals of each armature coil 12b, one winding terminal is connected to one midpoint member 24, so that this midpoint member 24 is interposed. Are connected to each other and are so-called Y-connected.
On the other hand, the other winding terminal of each armature coil 12 b is connected to the corresponding commutator piece 22, and these commutator pieces 22 are equiangularly spaced from the center of the rotating shaft 11. By being arranged, power is supplied in contact with the brushes 17 and 18 sequentially at the time of rotation.

Here, as shown in the developed view of FIG. 9B, each armature coil 12b is wound with, for example, the armature coil 12b2 on the left side after the armature coil 12b1 that is second from the right is wound. Further, the left armature coil 12b3 is wound, so that one coil winding is wound around the iron core 12a sequentially.
At that time, as shown by an arrow A, the coil winding at the beginning of winding is tangled by both the commutator hook 22b of the commutator piece 22 and the midpoint hook 24b of the midpoint member 24 which are adjacent to each other, When the child coil 12b1 is wound, the next armature coil 12b2 is wound after being wound on the commutator hook 22b of the next commutator piece 22 and the middle point member 24 and the middle point hook 24b. The commutator hook 22b of the next commutator piece 22 and the midpoint member 24 and the midpoint hook 24b are entangled again. Finally, the armature coil 12b3 is wound. As shown, the coil winding is overlapped with both the commutator hook 22 b of the commutator piece 22 and the midpoint hook 24 b of the midpoint member 24 so as to overlap the coil winding at the beginning of winding.
In FIG. 9B, for easy understanding, the armature coils 12b3 arranged on both the left and right sides show the same one armature coil.

Thus, at the beginning and end of winding of the coil winding, as shown in FIG. 10A, the two coil windings 12c are connected to the commutator hook 22b by one commutator hook 22b and a midpoint hook 24b. And it is clamped by the midpoint hook 24b. (In FIG. 10A, the midpoint hook 24b is illustrated.)
In contrast, in the other commutator hook 22b and the midpoint hook 24b, only one coil winding 12c is sandwiched between the commutator hook 22b and the midpoint hook 24b. (Similarly, FIG. 10B shows the midpoint hook 24b.)

Here, as shown in FIG. 9B, the coil winding 12 c tangled to both the commutator hook 22 b of the commutator piece 22 and the midpoint hook 24 b of the midpoint member 24 is connected to the commutator piece 22. Since the midpoint member 24 is short-circuited, it is necessary to separate it.
Therefore, as shown in FIG. 11, the coil windings 12c between the commutator hooks 22 of the commutator pieces 22 adjacent to each other and the midpoint hooks 24 of the midpoint members 24 are respectively along the cutting line C. Disconnected.

The present invention can be implemented in various forms without departing from the spirit of the present invention.
For example, in the above-described embodiment, the three-pole armature 12 is provided for the two-pole field 13, but the invention is not limited thereto, and for example, a six-pole armature may be provided. .

DESCRIPTION OF SYMBOLS 10 Motor 11 Rotating shaft 12 Armature 13 Field magnet 14, 15 Bearing 16 Casing 17, 18 Brush 20 Commutator part 21 Insulating core part 22 Commutator piece 22b Commutator hook 23 Insulating member 24 Midpoint member 24b Midpoint hook 31 Electrode Combined chuck 32 Spot welding electrode

Claims (5)

A plurality of armature coils arranged at equiangular intervals with respect to the rotation axis, and a commutator portion provided on the rotation axis adjacent to the armature coil,
The commutator part is an insulating core part fitted on a rotating shaft, a plurality of commutator pieces arranged at equiangular intervals in the circumferential direction along the peripheral surface of the insulating core part, and the commutator piece A midpoint member made of an annular conductive material disposed on the outer side of the annular insulating member,
Each of the commutator pieces extends in parallel with the rotation axis along the surface of the insulating core part, and includes a commutator hook that protrudes outward from the outer peripheral edge thereof, respectively.
The midpoint member includes a plurality of midpoint hooks that extend parallel to the rotation axis along the surface of the insulating member and project outward at equal angular intervals in the circumferential direction.
One of the winding terminals of the armature coil is electrically connected to the corresponding commutator hook by spot welding, and the other of the winding terminals is connected to the corresponding midpoint hook by spot welding. An armature for a motor, which is electrically connected.   Each of the commutator hooks and each of the midpoint hooks are curved in the radial direction with respect to the rotation axis, and in the spot welding, the radial ends with the corresponding winding terminals inserted inside the curved portion The armature for a motor according to claim 1, wherein the winding terminal is clamped by being pressed from the outside.   2. The motor electrical machine according to claim 1, wherein each of the commutator hooks is engaged with an engaging portion provided on the insulating core portion so as not to move in a circumferential direction. Child.   3. The motor according to claim 1, wherein the midpoint hook is engaged with an engaging portion provided on the insulating core portion so as not to move in a circumferential direction. 4. Armature. A rotating shaft; an armature attached to the rotating shaft; a field disposed so as to surround the armature; and a bearing that rotatably supports the rotating shaft;
The motor according to claim 1, wherein the armature is the motor armature according to claim 1.

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