JP2003070224A - Motor, pm type stepping motor, and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the strength of a terminal block seating part without deteriorating the characteristics of a motor. SOLUTION: This PM (permanent magnet) type stepping motor includes a magnet rotor in which a plurality of permanent magnets alternately polarized to different poles in the circumferential direction are arranged, a first magnet circuit and a second magnet circuit which are disposed on both sides of the magnet rotor. The terminal block seating part which supports a terminal for engaging a lead wire or the like of a coil wound around a bobbin with a collar of the bobbin extended, is formed so as to be integrated with the bobbin respectively in the first magnet circuit and the second magnet circuit. The terminal block seating part is displaced so as to protrude to an outer peripheral part of the motor. In this PM type stepping motor, the two terminal block seating parts which constitute the first magnet circuit and the second magnet circuit respectively are disposed so that respective longitudinal directions face each other, and resin is charged into between at least the two terminal block seating parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly, to a terminal pedestal portion for supporting a terminal for entwining a lead wire of a coil wound on the bobbin by extending a collar portion of the bobbin. The present invention relates to a motor which is formed integrally with a bobbin and in which the terminal pedestal portion is arranged so as to project to the outer peripheral portion of the motor.

[0002]

2. Description of the Related Art FIG. 9 is provided with a magnet rotor magnetized alternately on different poles in the circumferential direction, and a first coil and a second coil for exciting magnetic poles arranged on both sides of the magnet rotor. , Conventional PM (Permanent Ma)
FIG. 3 is a sectional view of a gnet) type stepping motor.

The first coil 105 is wound around a bobbin 106 and is arranged between the first outer magnetic pole 103 and the first inner magnetic pole 104. Similarly, the second coil 110
Is wound around the bobbin 111 and is disposed between the second outer magnetic pole 108 and the second inner magnetic pole 109. The magnet rotor 102 has a configuration in which a plurality of permanent magnets that are alternately magnetized in different poles (N pole / S pole) in the circumferential direction are arranged, and are fixed to the shaft 101 to form the bearing portion 10.
It is rotatably supported by 7,112.

The brim portions 106b and 111b on the opposite sides of the bobbins 106 and 111 are extended to the outside of the motor having a substantially cylindrical shape, and the terminal pedestals 106a and 11b.
1a is formed and these terminal pedestals 106a and 111a are formed.
Terminal portions (lead wires) of the first and second coils 105 and 110 are entwined with the terminals 113 and 114 fixed to the. The terminal pedestals 106a and 111a are arranged so as to project from the outer peripheral surface of the motor.

The PM type stepping motor having such a structure is used in a small AV device such as an autofocus mechanism of a digital camera or a video camera.

[0006]

However, in the above-mentioned conventional PM type stepping motor, the terminals 113 and 11 are used.
The terminal pedestals 106a and 111a holding the bobbin 4 are bobbins 106 and 11 on which the coils 105 and 110 are wound, respectively.
Although it is formed integrally with the bobbin 106, 111 by being connected to the first brim portion 106b, 111b, in order to improve the characteristics (output torque etc.) of the motor, the brim portion 10
It is necessary to thin 6b and 111b. The terminal pedestals 106a and 111a are arranged so as to project from the outer peripheral surface of the motor.

For this reason, the brim portions 106b and 111b become weak in strength, and there is a possibility that the terminal pedestal portions 106a and 111a may be damaged together with the brim portions 106b and 111b when an external force is applied to the terminal pedestal portions 106a and 111a. It was

To solve this problem, the brim portion 106
b, 111b may be thickened, but the brim portions 106b, 1b
If the thickness of 11b is increased, the motor characteristics are deteriorated as can be inferred from the above description.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to increase the strength of the terminal pedestal portion without degrading the characteristics of the motor.

[0010]

In order to solve the above problems, the present invention provides a terminal for supporting a terminal for extending a brim portion of a bobbin and for entwining a lead wire or the like of a coil wound around the bobbin. In a motor in which a pedestal portion is formed integrally with the bobbin and the terminal pedestal portion is arranged so as to project to the outer peripheral portion of the motor, a predetermined member is placed in contact with at least one side surface of the terminal pedestal portion. ing.

Further, according to the present invention, a magnet rotor in which a plurality of permanent magnets magnetized alternately at different poles in the circumferential direction are arranged, and a first rotor arranged on both sides of the magnet rotor.
Magnetic circuit section and second magnetic circuit section, and the first magnetic circuit section and the second magnetic circuit section respectively have leads of coils wound around the bobbin by extending the brim section of the bobbin. A PM (Permanent) in which a terminal pedestal portion that supports terminals for entanglement of wires and the like is integrally formed with the bobbin and the terminal pedestal portion is arranged so as to project to the outer peripheral portion of the motor.
In the (Magnet) type stepping motor, the two terminal pedestals that respectively configure the first magnetic circuit unit and the second magnetic circuit unit are arranged so that their longitudinal directions face each other, and at least the two terminals are arranged. Resin is filled between the pedestals.

Further, according to the present invention, a magnet rotor in which a plurality of permanent magnets magnetized alternately at different poles in the circumferential direction are arranged, and a first rotor arranged on both sides of the magnet rotor.
Magnetic circuit section and second magnetic circuit section, and the first magnetic circuit section and the second magnetic circuit section respectively have leads of coils wound around the bobbin by extending the brim section of the bobbin. A terminal pedestal portion that supports terminals for entanglement of wires and the like is integrally formed with the bobbin, and the terminal pedestal portion is arranged so as to project to the outer peripheral portion of the motor. The two terminal pedestals forming the two magnetic circuit portions are arranged so that their longitudinal directions face each other, and PM (Permanent Magnet) type stepping in which resin is filled between at least the two terminal pedestals. A method of manufacturing a motor, wherein the first magnetic circuit unit and the second magnetic circuit unit are manufactured as two modules having the same configuration divided in a form including the filled resin, respectively. One The divided resin is joined by assembling the module of (1) with the magnet rotor.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 is an exploded perspective view of a PM type stepping motor to which the present invention is applied.

In FIG. 1, the first magnetic circuit portion 1 and the second magnetic circuit portion 1
Bearings 5 and 6 are press-fitted into the magnetic circuit unit 2. These bearings 5 and 6 rotatably axially support a magnet (magnet rotor) 3 fixed to a rotor shaft 4. The magnet 3 is composed of a plurality of magnets finely divided in the circumferential direction, and the plurality of magnets are alternately magnetized to different poles (N pole / S pole).

First magnetic circuit section 1 and second magnetic circuit section 2
Are fixed to the bearings 5, 6 by a method such as adhesion, ultrasonic welding, laser welding, or the like that does not hinder the rotation of the rotor shaft 4 and the magnet 3 inside. It should be noted that even if the first magnetic circuit unit 1 and the second magnetic circuit unit 2 are made into a common module, there is no hindrance to the motor performance. It is desirable that the two magnetic circuit units 2 be a common module.

FIG. 2 is a sectional view showing a module (common module) of the first magnetic circuit unit 1 or the second magnetic circuit unit 2 shown in FIG. The coil 12 is wound around a bobbin 13, and its lead wire 12a is entangled with a terminal 14 that is driven into a terminal pedestal portion 13b that extends the collar portion 13a of the bobbin 13 and projects outward from the motor outer periphery. There is. The outer magnetic pole portion 10 and the inner magnetic pole portion 11 include a coil 12
Are connected with a bobbin 13 wound around.

The resin portion 15 covers the outer peripheral portion of the circle connecting the inner peripheral portion of the outer magnetic pole portion 10 facing the magnet 3 and is further filled in contact with the terminal pedestal portion 13b for connecting the coil 12 to the outside. To be done. That is, at least
A resin portion 15 is filled in a portion between the terminal pedestal portion 106a and the terminal pedestal portion 111a shown in FIG. 9 as a conventional example, and the terminal pedestal portion 106a and the terminal pedestal portion 111a are filled.
The height (thickness) of the resin portion 15 between the terminal pedestal portion 10 and
The heights of 6a and 111a match.

However, as shown in FIG. 1, the resin portion 15 is actually divided into two as a constituent element of each module of the first magnetic circuit portion 1 and the second magnetic circuit portion 2. Manufactured by assembling these modules,
The resin portion 15 divided into two is joined.

In FIG. 1, the resin portion 15 is filled only in the portion of the terminal pedestal portion 13b, but actually, as shown in FIG. 2, it covers the outer peripheral portion. However,
As described above, it is of course possible to fill only the portion of the terminal pedestal portion 13b with the resin portion 15 and not cover the other outer peripheral portion with the resin portion 15.

The resin portion 15 which is divided into two parts,
When the respective modules of the first magnetic circuit unit 1 and the second magnetic circuit unit 2 are assembled, the convex portions 15a and the concave portions 15b are formed, and the convex portions 15a formed on the resin portion 15 on one of the modules are formed. The concave portion 15b is fitted into the concave portion 15b and the convex portion 15a formed in the resin portion 15 on the other module, so that the respective modules are prevented from rotating in a relatively positioned state.

The convex portion 15a and the concave portion 15b are formed in the resin portion 15 on each module, respectively, in order to make the first magnetic circuit portion 1 and the second magnetic circuit portion 2 into a common module. . In other words, if only the convex portion is formed in the resin portion 15 on each module on one side and only the concave portion is formed on the resin portion 15 on the other module, the first magnetic circuit portion 1 and the second magnetic circuit portion 1 are formed. This is because 2 cannot be a common module.

By thus filling the resin portion 15 between the two terminal pedestal portions 13b, the terminal pedestal portion 13b can be formed.
It is possible to prevent the terminal pedestal portion 13b from being destroyed by stress or the like when soldering the flexible printed circuit board or the lead wire of the coil 12 to the terminal 14 as a result.

Further, if the adhesion strength between the terminal pedestal portion 13b and the resin portion 15, that is, the strength of the terminal pedestal portion 13b is sufficiently large, the brim portion 13a of the bobbin 13 is made thinner than the conventional one to improve the motor characteristics. It is also possible.

In the first embodiment, as shown in FIG. 1, the two terminal pedestals 13b are in contact with the resin portion 15 only at the surfaces (side surfaces) facing each other. Has become.

Thus, only the surfaces of the two terminal pedestals 13b facing each other contact the resin portion 15, respectively, and the surfaces adjacent to the surfaces of the two terminal pedestals 13b facing each other (terminal pedestal). The reason why the resin portion 15 is not enclosed up to the circumferential surface of the portion 13b) is as follows.

That is, the two terminal pedestals 13b are arranged in such a direction that the wall thickness is thin in the motor axial direction (the direction in which the resin portion 15 is filled) and easily falls down, and the circumferential direction is thick and difficult to fall down. In other words, in other words, the two terminal pedestals 13b are arranged so that their side surfaces in the longitudinal direction face each other in the direction orthogonal to the rotor shaft 4, and thus the two terminal pedestals 13b are arranged. The strength of 13b is considered to be sufficient for the above-mentioned one-sided contact, and is intended to improve the productivity without causing the multi-sided contact.

[Second Embodiment] FIG. 3 is a cross-sectional view of the module of the PM type stepping motor according to the second embodiment.

In the second embodiment, as shown in FIG. 3, the convex portion 1 is formed on the contact surface of the terminal pedestal portion 13b with the resin portion 15.
3c is formed. In the second embodiment, the first
Similar to the above embodiment, the two terminal pedestals 13b are in contact with the resin portion 15 only on one side surface, respectively.

Thus, the resin portion 15 of the terminal pedestal portion 13 is
By forming the protrusion 13 on the contact surface with the terminal pedestal portion 13b and the resin portion 15, the contact strength between the terminal pedestal portion 13b and the resin portion 15 is improved.
It is possible to reliably prevent the terminal pedestal portion 13b from being broken due to stress or the like when soldering the flexible printed circuit board or the lead wire of the coil 12 to the connector 4.

If the adhesion strength between the terminal pedestal portion 13b and the resin portion 15, that is, the strength of the terminal pedestal portion 13b is sufficiently large, the brim portion 13a of the bobbin 13 is made thinner than in the conventional case, thereby improving the motor characteristics. It is also possible.

[Third Embodiment] FIG. 4 is a sectional view of the module of the PM type stepping motor according to the third embodiment.

In the third embodiment, as shown in FIG. 4, the concave portion 1 is formed on the contact surface of the terminal pedestal portion 13b with the resin portion 15.
3d is formed. In addition, in the third embodiment, as in the first and second embodiments, the two terminal pedestals 13b are provided.
Are in contact with the resin portion 15 only on one side surface.

Thus, the resin portion 15 of the terminal pedestal portion 13 is
By forming the recess 13d on the contact surface with the terminal pedestal portion 13b and the resin portion 15, the contact area between the terminal pedestal portion 13b and the resin portion 15 is improved, and thus the flexible printed on the terminal 14. The terminal pedestal portion 13 is subjected to stress or the like when soldering the lead wires of the board or the coil 12.
It is possible to surely prevent b from being destroyed.

Further, if the adhesion strength between the terminal pedestal portion 13b and the resin portion 15, that is, the strength of the terminal pedestal portion 13b is sufficiently large, the brim portion 13a of the bobbin 13 is made thinner than in the conventional case to improve the motor characteristics. It is also possible.

[Fourth Embodiment] FIG. 5 is a sectional view of the module of the PM type stepping motor according to the fourth embodiment.

In the fourth embodiment, similar to the first embodiment, the surfaces of the two terminal pedestals 13b facing each other are filled with the resin portion 15, and further, the surfaces opposite to the facing surfaces are filled. The surface is also formed by contacting the resin portion 15. That is, in the fourth embodiment, the two terminal pedestals 13b are in contact with the resin portion 15 on the two surfaces, respectively.

As described above, the surfaces of the two terminal pedestal portions 13b facing each other are filled with the resin portion 15, and the resin portion 15 is also formed in contact with the surface opposite to the facing surface. It is possible to prevent the two terminal pedestals 13b from falling toward the facing surface and the opposite surface.

If the adhesion strength between the terminal pedestal portion 13b and the resin portion 15, that is, the strength of the terminal pedestal portion 13b is sufficiently large, the brim portion 13a of the bobbin 13 is made thinner than in the conventional case to improve the motor characteristics. It is also possible.

[Fifth Embodiment] FIG. 6 is a plan view of a PM type stepping motor according to a fifth embodiment of the present invention, and is a plan view of the PM stepping motor as viewed from above the terminal pedestal portion 13b in the assembled state. .

In the fifth embodiment, as shown in FIG. 6, between the two terminal pedestals 13b, the terminal pedestals 1 are provided.
3b, that is, two surfaces adjacent to the opposite surfaces of the two terminal pedestals 13b (the terminal pedestals 13b).
The resin portion 15 is filled so as to surround up to (the surface in the circumferential direction). That is, in the fifth embodiment, the two terminal pedestals 13b are in contact with the resin portion 15 on three surfaces, respectively.

In this way, the resin portion 15 is filled between the two terminal pedestals 13b so as to surround the surfaces on both sides of the terminal pedestals 13b, and the two terminal pedestals 13b are respectively resin-coated with three surfaces. By contacting the part 15, 1
Since the contact area becomes wider than the case of contacting with one or two surfaces and the adhesion strength between each terminal pedestal portion 13b and the resin portion 15 is improved, as in the fourth embodiment, the two terminal pedestal portions 13b have the same contact strength. It is possible to prevent the two terminal pedestals 13b from falling toward the facing surface and the opposite surface without contacting the resin portion 15 with the opposite surface in addition to the facing surfaces. .

Further, if the adhesion strength between the terminal pedestal portion 13b and the resin portion 15, that is, the strength of the terminal pedestal portion 13b is sufficiently large, the brim portion 13a of the bobbin 13 is made thinner than in the conventional case to improve the motor characteristics. It is also possible.

[Sixth Embodiment] FIG. 7 is a plan view of a PM type stepping motor according to a sixth embodiment, and is a plan view of the PM stepping motor as viewed from above the terminal pedestal portion 13b in the assembled state. .

In the sixth embodiment, as shown in FIG. 7, as in the fifth embodiment, two terminal pedestals 13b are provided.
In between, the resin portion 15 is filled so as to surround the both side surfaces of the terminal pedestal portions 13b, and the two terminal pedestal portions 13b are configured to contact the resin portion 15 on three surfaces, respectively. The convex portions 13e are formed on both sides of each terminal pedestal portion 13b.

By thus forming the protrusions 13e on both sides of each terminal pedestal 13b, it is possible to prevent the two terminal pedestals 13b from falling down toward the facing surface and the opposite surface. This can be prevented more reliably than in the fifth embodiment.

Further, if the adhesion strength between the terminal pedestal portion 13b and the resin portion 15, that is, the strength of the terminal pedestal portion 13b is sufficiently large, the brim portion 13a of the bobbin 13 is made thinner than the conventional one to improve the motor characteristics. It is also possible.

Needless to say, even if convex portions are formed on both side surfaces of the two terminal pedestal portions 13b instead of the convex portions 13e, the same effect as that of the sixth embodiment can be obtained.

[Seventh Embodiment] FIG. 8 is a plan view of a PM type stepping motor according to a seventh embodiment, and is a plan view of the PM stepping motor seen from above the terminal pedestal portion 13b in the assembled state. .

In the seventh embodiment, as shown in FIG. 8, the resin portion 15 is formed so as to surround the two terminal pedestal portions 13b. That is, in the seventh embodiment, the two terminal pedestals 13b are in contact with the resin portion 15 on the four side surfaces, respectively.

By thus forming the resin portion 15 so as to surround the periphery of the two terminal pedestals 13b, it is possible to prevent the two terminal pedestals 13b from falling toward the facing surface and the opposite surface. It can be prevented more reliably than in the fifth embodiment.

Further, if the adhesion strength between the terminal pedestal portion 13b and the resin portion 15, that is, the strength of the terminal pedestal portion 13b is sufficiently large, the brim portion 13a of the bobbin 13 is made thinner than the conventional one to improve the motor characteristics. It is also possible.

[Application Modifications] The present invention is not limited to the above-described embodiments, and for example, in the fourth, fifth and seventh embodiments, the resin portion 15 of each terminal pedestal portion 13b is also used.
The above-described respective embodiments may be appropriately combined with each other by providing a concave portion or a convex portion on the contact surface with.

It is also possible to further form a groove or the like on the peripheral surface of the concave portion or the convex portion of each terminal pedestal portion 13b so as to more firmly enhance the adhesion strength between each terminal pedestal portion 13b and the resin portion 15. is there. It is also possible to use another member instead of the resin.

Further, a terminal pedestal portion is formed integrally with the bobbin, the terminal pedestal portion being formed integrally with the bobbin by extending the collar portion of the bobbin to entangle the lead wire of the coil wound around the bobbin. Can be applied to any type of motor as long as the motor is arranged so as to project from the outer peripheral portion of the motor.

Further, the number of terminal pedestals is not limited to two, and the invention can be applied to various motors having one or three or more terminal pedestals.

Further, the terminal pedestal portion can also be applied to various motors arranged such that the longitudinal direction thereof is parallel to the motor rotation axis. However, in this case, it is not so important to fill the space between the plurality of terminal pedestals with resin or the like, but it is important to bring the resin or the like into contact with the side surfaces in the longitudinal direction.

Further, the height (thickness) of the resin portion does not necessarily have to match the height of the terminal pedestal portion, and may be lower (thinner) than the terminal pedestal portion.

[0059]

As described above, according to the present invention,
The strength of the terminal pedestal can be increased without degrading the characteristics of the motor, and the terminal pedestal can be destroyed due to stress when soldering the coil lead wire to the terminal provided on the terminal pedestal. Can be prevented.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a step PM type stepping motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a common module of a step PM type stepping motor according to the first embodiment of the present invention.

FIG. 3 is a sectional view showing a common module of a step PM type stepping motor according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing a common module of a step PM type stepping motor according to a third embodiment of the present invention.

FIG. 5 is a sectional view showing a common module of a step PM type stepping motor according to a fourth embodiment of the present invention.

FIG. 6 is a plan view of a step PM type stepping motor according to a fifth embodiment of the present invention.

FIG. 7 is a plan view of a step PM type stepping motor according to a sixth embodiment of the present invention.

FIG. 8 is a plan view of a step PM type stepping motor according to a seventh embodiment of the present invention.

FIG. 9 is a cross-sectional view of a conventional step PM type stepping motor.

[Explanation of symbols]

1: First magnetic circuit unit 2: Second magnetic circuit section 3: Magnet (magnet rotor) 4: Rotor shaft 5,6: Bearing 10: Outer magnetic pole part 11: inner magnetic pole 12: coil 13: Bobbin 13b: Terminal pedestal 13c, 13d: convex portion 13d: recess 14: Terminal 15: Resin part

Claims (21)

[Claims] 1. A terminal pedestal portion, which is formed integrally with the bobbin, for supporting a terminal for extending a brim portion of the bobbin and for entwining a lead wire of a coil wound around the bobbin, and the terminal pedestal portion. In the motor arranged so as to protrude from the outer peripheral portion of the motor, a predetermined member is arranged in contact with at least one side surface of the terminal pedestal portion. 2. The motor according to claim 1, wherein the predetermined member is made of resin. 3. The predetermined member covers the outer peripheral surface of the motor, and a thickness of a portion in contact with the terminal pedestal portion is increased. motor. 4. The predetermined member covers an outer peripheral surface of the motor, and a thickness of a portion in contact with the terminal pedestal portion is the same as an upper surface of the terminal pedestal portion. The motor according to any one of claims 1 to 3, which is characterized. 5. The motor according to claim 1, wherein the terminal pedestal portion has a convex portion formed on a contact surface with the predetermined member. 6. The motor according to claim 1, wherein the terminal pedestal portion has a recess formed on a contact surface with the predetermined member. 7. The predetermined member is 2 of the terminal pedestal portion.
It is in contact with one side surface.
The motor according to any one of 1. 8. The predetermined member is 3 of the terminal pedestal portion.
It is in contact with one side surface.
The motor according to any one of 1. 9. The predetermined member is 4 of the terminal pedestal portion.
It is in contact with one side surface.
The motor according to any one of 1. 10. The terminal pedestal portion is provided in plurality, and a predetermined member is arranged in contact with at least one side surface of the plurality of terminal pedestal portions. Motor. 11. The motor is a PM (Permane).
The motor according to any one of claims 1 to 10, which is a stepping motor of the nt Magnet type. 12. A magnet rotor in which a plurality of permanent magnets, which are magnetized alternately at different poles in the circumferential direction, are arranged, and a first magnetic circuit unit and a second magnetic circuit arranged on both sides of the magnet rotor. Each of the first magnetic circuit section and the second magnetic circuit section has a terminal for tying a lead wire of a coil wound around the bobbin by extending the brim section of the bobbin. A supporting terminal pedestal is integrally formed with the bobbin, and the terminal pedestal is arranged in a shape protruding from the outer peripheral portion of the motor.
In the t) type stepping motor, the two terminal pedestals forming the first magnetic circuit section and the second magnetic circuit section are arranged so that their longitudinal directions face each other, and at least the two terminals are arranged. A PM type stepping motor characterized by being filled with resin between pedestals. 13. The PM according to claim 12, wherein the resin covers an outer peripheral surface of the PM type stepping motor, and a thickness of a portion in contact with the terminal pedestal portion is increased. Type stepping motor. 14. The predetermined member covers an outer peripheral surface of the PM type stepping motor, and a thickness of a portion in contact with the terminal pedestal portion is the same as an upper surface of the terminal pedestal portion. Claim 12 or 1 characterized by the fact that
PM type stepping motor according to item 3. 15. The terminal pedestal portion has a convex portion formed on a contact surface with the resin.
15. A PM type stepping motor according to any one of 14 to 14. 16. The terminal pedestal portion has a recess formed in a contact surface with the resin.
15. A PM type stepping motor according to any one of 14 to 14. 17. The resin according to claim 12, wherein the resin is in contact with side surfaces of the terminal pedestal portion facing each other and a side surface opposite to the facing side surfaces. PM type stepping motor. 18. The resin according to claim 12, wherein the resin is in contact with side surfaces of the terminal pedestal portion facing each other and two side surfaces adjacent to the side surfaces. PM type stepping motor. 19. The resin is in contact with four side surfaces of the terminal pedestal portion, according to any one of claims 12 to 16.
PM type stepping motor motor according to any one of 1. 20. A magnet rotor in which a plurality of permanent magnets, which are magnetized alternately at different poles in the circumferential direction, are arranged, and a first magnetic circuit unit and a second magnetic circuit arranged on both sides of the magnet rotor. Each of the first magnetic circuit section and the second magnetic circuit section has a terminal for tying a lead wire of a coil wound around the bobbin by extending the brim section of the bobbin. A supporting terminal pedestal portion is formed integrally with the bobbin, and the terminal pedestal portion is arranged so as to project to an outer peripheral portion of the motor, and constitutes the first magnetic circuit portion and the second magnetic circuit portion, respectively. The two terminal pedestals are arranged such that their longitudinal directions face each other, and at least the two
PM (Per) filled with resin between the two terminal pedestals
(manent Magnet) type stepping motor, wherein the first magnetic circuit unit and the second magnetic circuit unit are divided into two modules each having the same configuration and containing the filled resin. By manufacturing and assembling the two modules together with the magnet rotor,
A method for manufacturing a PM type stepping motor, which comprises joining the divided resins. 21. The convex portion and the concave portion are formed on the joint surface of the divided resin.
A method of manufacturing a PM type stepping motor according to item 1.