JPH06189484A - Motor - Google Patents

Abstract

PURPOSE:To realize a motor whose size can be miniaturized by a method wherein the large capacities of the winding parts of a yoke is maintained. CONSTITUTION:This coating films 42 are formed on the surfaces of the winding parts 40 and 41 of the yoke 30 of a stepping motor 10 in order to isolate armature windings 22 from the yoke 30 electrically. The yoke 30 is composed of yoke components 31-34 which have flange parts. Among the flange parts, some of them are brought into contact with each other. In the contact surfaces between such flange parts, resin feeding passages 35 are formed from the inner circumference side toward the outer circumference side of the yoke 30. When the yoke 30 is molded with resin, the resin is supplied from the inner circumference side to the outer circumference side through the resin feeding passages 35 and a terminal block 23 made of resin is formed simultaneously.

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 structure technology of its armature.

[0002]

2. Description of the Related Art A motor has an armature in which an armature winding is wound around a yoke, and a yoke used in a stepping motor or the like is, for example, a yoke forming member 51 shown in FIG.
It may consist of This yoke forming member 51
Is a plurality of tooth pieces 5 protruding at a right angle from the inner peripheral side of the collar portion 52.
3 and the yoke forming member 51 has a structure shown in FIGS.
As shown in FIG. 5, the yoke 50 is formed by connecting the tooth pieces 53 on one side so as to be positioned between the tooth pieces 53 on the other side. Here, the respective yoke forming members 51 are connected by the resin layer 54 on the inner peripheral side of the tooth piece 53 and the resin layer 55 on the outer peripheral side thereof (the resin portion is shaded). The resin layer 55 on the outer peripheral side of 53 is a tooth piece 53.
Also, when the armature winding 57 is wound around the winding winding portion 56 defined by the collar portion 52, it has a function of insulating the armature winding 57 and the yoke 50 from each other. Further, on the outer peripheral side of the yoke 50, when the yoke 50 is molded with the resin layers 54 and 55, a resin terminal block 59 is also formed at the same time, and the terminals 58 fixed to the terminal block 59 are used to make an electric machine. The ends of the child winding 57 are processed. In this way, the armature 60
After the formation of the armature 60, the armature 60 is housed in the motor case with the shaft 62 penetrating therethrough. Here, the magnet 61 is fixed to the shaft 62.

[0003]

However, in the conventional stepping motor, the resin layer 55 for ensuring the insulation between the yoke 50 and the armature winding 57 is formed simultaneously with the molding for the yoke 60. Since the wall thickness is large, there is a problem that the volume of the winding winding portion 57 is small and a large area of the armature winding 57 cannot be secured.

In view of the above problems, the object of the present invention is to
By improving the structure of the yoke and ensuring a large capacity of the winding winding portion thereof, it is possible to realize a motor advantageous for downsizing.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the means taken in a motor according to the present invention is a winding winding part formed in a yoke of an armature and around which an armature winding is wound. In the above, the insulating layer that insulates and separates the yoke from the armature winding is constituted by a coating layer formed on the surface of the winding winding portion.

Here, in the case where the yoke is a mold type in which a resin layer on the inner peripheral side is molded, forming the insulating layer with a coating layer means that when the yoke is resin-molded, its winding wire is wound. It is not necessary to form a resin layer on the turn portion, and the structure is such that resin cannot be supplied to the outer peripheral side of the yoke, so that it is not possible to simultaneously form a resin terminal block on the outer peripheral side of the collar portion during molding of the yoke. Therefore, in the present invention, for the purpose of forming a resin terminal block on the outer peripheral side of the flange portion of the yoke, the yoke has a plurality of yoke forming members having a flange portion that partitions and forms the winding winding portion. In the case where they are connected by the resin layer on the side, the contact surface of at least one of the flange portions of the flange portions of these yoke forming members that are in surface contact, from the inner peripheral side to the outer peripheral side. It is preferable that a resin supply passage is formed so as to be capable of supplying resin toward the outer peripheral side of the collar portion and a resin terminal block for fixing the terminal is formed.

[0007]

In the motor according to the present invention, the insulating layer formed on the surface of the winding winding portion of the yoke and insulatingly separating the yoke side and the armature winding is not the resin layer formed when the yoke is molded. However, the insulating layer can be formed thin because it is composed of the coating layer applied thereto. Therefore, the volume of the winding winding portion is increased, and the volume of the armature winding that can be wound on the winding winding portion is increased. Therefore, if the yoke has the same size, the output torque of the motor can be increased, while if the output torque is the same, the armature can be downsized, that is, the motor can be downsized.

Here, in the case of the type in which the yoke is molded with the resin layer on the inner peripheral side, the insulating layer is constituted by a coating layer means that the inner peripheral side and the outer peripheral side of the yoke are not connected. Therefore, the resin terminal block cannot be formed on the outer peripheral side of the collar portion of the yoke. Therefore, in the present invention, the resin is supplied from the inner peripheral side toward the outer peripheral side to the contact surface of at least one of the flange portions of the flange portions of the yoke forming member forming the yoke that are in surface contact with each other. Since a possible resin supply passage is formed, when a plurality of yoke forming members are molded and integrated with the resin on the inner peripheral side, they are formed on the contact surface of the flange portion from the inner peripheral side of the yoke forming member. The resin is supplied to the outer peripheral side through the above-mentioned oil supply passage. Therefore, the resin terminal block can be formed at the same time when the yoke is resin-molded.

[0009]

Embodiments of the present invention will now be described with reference to the accompanying drawings.

FIG. 1 is a schematic sectional view schematically showing the structure of a main part of a stepping motor according to an embodiment of the present invention, FIG. 2 is a schematic perspective view schematically showing the structure of an armature, and FIG. It is a perspective view which shows the structure of the yoke formation member which comprises a yoke. 4A is a side view showing the arrangement of the yoke forming members in the yoke of the stepping motor, FIG.
(B) is a plan view showing a configuration of a resin supply passage formed in the flange portion.

In these figures, a stepping motor 10 of the present example has a first bearing 12 on the bottom surface 11a side of a motor case 11 and a second bearing 13 on the case open end side.
And a shaft 15 is supported by the bearings 12 and 13, and the shaft 15 has a magnet 1
4 is fixed. An armature 20 is arranged around the magnet 14, and an armature winding 22 is wound around a yoke 30 of the armature 20. An end portion 221 of the armature winding 22 has an end portion 221 of the yoke 30. It is connected to four terminals 24 made of a CP wire fixed to a resin-made terminal block 23 formed on the outer peripheral side.

Here, the yoke 30 is composed of four first to fourth yoke forming members 31, 3 as shown in FIG.
2, 33, 34, and any of the yoke forming members 31 to 34 has five tooth pieces 31 from the collar portions 310, 320, 330, 340 having a thickness of about 0.5 mm.
1, 321, 331, 341 are flanges 310, 320, 3
It projects at a right angle to 30, 340 at equal intervals. Further, cutouts 315, 325, 3 used for positioning and the like are provided on the outer peripheral edges of the flange portions 310, 320, 330, 340.
35 and 345 are formed respectively. Where the first
In the state in which the to fourth yoke forming members 31 to 34 form the yoke 30, as shown in FIG. 4A, the first to fourth yoke forming members 31 to 34 are first.
The yoke forming member 31 (outer yoke) and the second yoke forming member 32 (inner yoke) of
One side of 1, 321 is arranged in a nesting manner with a predetermined gap between the other side, while the third yoke forming member 33 (inner yoke) and the fourth yoke forming member 34 (outer yoke). Means that one side of each tooth piece 331, 341 is arranged in a nesting type with a predetermined gap between the other side, and in this state, a nylon resin containing 40% of glass, etc. Are connected by a resin layer 25 having a heat resistance of about 0.3 mm. Here, the flange portion 320 of the second yoke forming member 32 and the flange portion 330 of the third yoke forming member 33 are in a state where the contact surfaces 320a, 330a on the back side are in surface contact with each other.

The resin layer 25 serves as a support portion 25a which projects from the end surface of the yoke 30 and fixes the second bearing 13. In the stepping motor 10 of this embodiment, the armature 20 and the shaft 15 are separated from each other. It can be housed in the motor case 11 in an integrated state. Therefore, even if there is no end cap attached to the open end side of the motor case 11, the shaft 15 is in a state of being supported by the armature 20 side. Since the size of the gap between the magnet 20 and the magnet 14 can be easily set to a predetermined condition, the step accuracy is high.

In the yoke 30 having such a structure,
Collar portion 310 and tooth piece 31 of the first yoke forming member 31
1 and the collar portion 320 and the tooth piece 321 of the second yoke forming member 32 define and form the first winding winding portion 40 around which the armature winding 22 is wound, and the third yoke forming member. By the collar portion 330 and the tooth piece 331 of 33 and the collar portion 340 and the tooth piece 341 of the fourth yoke forming member 34,
The second winding winding portion 41 around which the armature winding 22 is wound is defined. Further, of the first to fourth yoke forming members 31 to 34, the second yoke forming member 32 and the third yoke forming member 31
Flat portions 323 and 333 are formed on the outer peripheral sides of the respective collar portions 320 and 330 of the yoke forming member 33 of FIG. 1. When the flat portions 323 and 333 are aligned with each other, the second yoke forming member 32 and the second yoke forming member 32 are aligned. 3 is connected to the yoke forming member 33, and by utilizing these flat portions 323 and 333, the resin terminal block 23 is formed.

In the armature 20 having such a structure, the armature winding 22 is a bare copper wire, while the first to fourth yoke forming members 31 to 34 are all made of soft iron.
In order to wind the armature winding 22 around the first winding winding portion 40 and the second winding winding portion 41 of the yoke 30, it is necessary to secure insulation between them. In order to ensure this insulating property, conventionally, when the first to fourth four yoke forming members 31 to 34 are molded with a resin layer, the resin layer is also formed on the surface of the winding winding portion. However, in the stepping motor 10 of this example, a thin coating layer 42, for example, a thin coating layer 42, which is baked after the fluorine-based resin or the like is sprayed on the surfaces of the first and second winding winding portions 40 and 41, is used. About 3
By forming a coating layer 42 having a thickness of 0 to 50 μm and using this coating layer 42 as an insulating layer that insulates the yoke 30 and the armature winding 22, the first and second winding winding portions 4 are formed.
By securing 0 and 41 large, the area of the armature winding 22 is increased.

When the yoke 30 having such a structure is adopted, it is not necessary to form a resin layer on the surfaces of the first and second winding winding portions 40 and 41, and the resin is supplied to the outer peripheral side of the yoke 30. This makes it impossible to simultaneously form the terminal block 23 when the first to fourth four yoke forming members 31 to 34 are molded with the resin layer 25. Here, although there is a method of providing the terminal block in a separate step, the number of manufacturing steps is increased and the cost is increased. Therefore, in the yoke 30 of this example, as shown in FIG. 3, two groove-shaped resin supply passages 324 are provided on the side of the contact surface 320a of the flange portion 320 of the second yoke forming member 32.
On the other hand, two groove-shaped resin supply passages 334 are also formed on the contact surface 330a side of the collar portion 330 of the third yoke forming member 33, as shown in FIG. 4 (b). To
Second yoke forming member 32 and third yoke forming member 33
Are connected in such a manner that the contact surfaces 320a, 330a of the collar portions 320, 330 are in surface contact with each other, the resin supply passage 324
And the resin supply passage 334 overlap each other to form two resin supply passages 35 having an opening cross section of about 0.3 to 0.4 mm square. Therefore, since the inner peripheral side and the outer peripheral side of the yoke 30 are in a state of being connected to each other through the resin supply passage 35, the first to fourth yoke forming members 31 to 34 are arranged on the inner peripheral side as described later. When molded with the resin layer 25, the resin supplied to the inner peripheral side of the yoke 30 is guided to the outer peripheral side via the resin supply passage 35 to form the terminal block 23.

The stepping motor 10 having such a configuration
Of these, a method of manufacturing the armature 20 will be described with reference to FIGS. 5 and 6.

FIG. 5 is a process sectional view schematically showing a step of molding the yoke of the stepping motor, FIG. 6 (a).
6A and 6B are explanatory views showing a state in which a coating layer is formed after molding a yoke of a stepping motor and a state in which an armature winding is wound, and FIG. 6B is a schematic sectional view thereof.

First, of the first to fourth yoke forming members 31 to 34 shown in FIG. 3, as shown in FIGS. 4A and 4B, a first yoke forming member 31 and a second yoke forming member 31. The forming member 32 is arranged in a nesting type in which one side of each of the tooth pieces 311 and 321 has a predetermined gap between the other side, while the third yoke forming member 33 and the fourth yoke forming member 34 are arranged. Are arranged in a nesting type in which one side of each of the tooth pieces 331 and 341 has a predetermined gap between the other side, and the second yoke forming member 32 and the third yoke forming member 33 are arranged. The contact surfaces 320a, 330a of the flanges 320, 330 are fixed by a predetermined jig in a state where they are in surface contact with each other.

Next, as schematically shown in FIG.
Or, the fourth yoke forming members 31 to 34 are accommodated in the hollow inside of the mold 36 in a state of being connected to each other. Here, in FIG. 5, the mold 36 and the first to fourth yoke forming members 31 to 31 are formed.
The space between and 34 is indicated by hatching, and the resin is supplied to this hatched area. That is, a gate 361 for supplying resin is provided on the inner peripheral side of the yoke 30, and the resin (indicated by an arrow A) supplied from the gate 361 is provided on the inner peripheral side of the yoke 30 as shown in FIGS.
The first to fourth yoke forming members 31 to 34 are filled with the resin layer 25 shown in (a) and (b) so as to be formed, and the second and third yoke forming members 3 are formed.
The two resin supply passages 35 formed between the collar portions 320 and 330 of the reference numerals 2, 33 are supplied to the outer peripheral side along the arrow B, and are shown in FIGS. 1, 2 and 6 (a), (b). The terminal block 23 shown in FIG. As a result, in the yoke 30 molded by the resin layer 25, the tooth pieces 311 and 32 of the first to fourth yoke forming members 31 to 34 are formed.
1, 331, 341 are fixed by the resin layer 25 in the hatched area in FIG. 6A while keeping a predetermined gap, and the rotation angle of the stepping motor 10 is set accurately. On the other hand, the collar portions 310, 320, 330, 3
The space defined by 40 becomes the first and second winding winding portions 40 and 41.

Next, as shown by dotted lines in FIGS. 6A and 6B, the first and second winding winding portions 4 of the yoke 30.
Fluorine resin, etc. is thinly and uniformly sprayed only on the surface of 0, 41 and then baked and solidified to a thickness of about 30.
A coating layer 42 having a thickness of 50 μm is formed.

The armature winding 22 is then wound around the first and second winding winding portions 40 and 41 of the yoke 30 as shown by the alternate long and short dash line in FIGS. 6 (a) and 6 (b). Then, the end portion 221 is wound around the terminal 24 fixed to the terminal block 23 for processing. As a result, the armature 20 shown in FIG. 2 is formed.

After that, as shown in FIG. 1, the yoke 3
Shaft 15 with magnet 14 fixed inside 0
The armature 20 is housed in the motor case 11 in a state of penetrating.

As described above, in the stepping motor 10 of this example, the yoke 30 and the armature winding 22 are provided in the first and second winding winding portions 40 and 41 of the yoke 30.
The insulating layer that insulates and separates is composed of a thin coating layer 42 applied to the surface of the insulating layer.
In the first embodiment, the volumes of the first and second winding winding portions 40 and 41 are expanded by about 1.5 times as compared with the conventional one, and the wire of the armature winding 22 that can be wound therein. The amount of product is greatly increased. Therefore, if the yoke 30 has the same size, the output torque of the stepping motor 10 can be increased, while if the output torque is the same, the armature 20 can be downsized.
That is, the stepping motor 10 can be downsized.

When the insulating layer is formed of the coating layer 42, the resin cannot be supplied to the first and second winding winding portions 40 and 41 of the yoke 30 when the yoke 30 is resin-molded. Although it is not possible to simultaneously form the terminal block 23 at the time of molding, in the stepping motor 10 of this example, the flange portions 310, 320, 330, 340 of the first to fourth yoke forming members 31 to 34 constituting the yoke 30 are formed.
The resin supply passages 324 and 334 (resin supply passages 35) are provided on the contact surfaces of the flange portions 320 and 330 that are in surface contact with each other. Therefore, when molding the yoke 30, the inner peripheral side of the yoke 30 is formed. The resin can be supplied to the outer peripheral side via the resin supply passage 35. Therefore, there is no problem in forming the resin layer 25 and the terminal block 23 at the same time, and only one resin molding step is required.

In the stepping motor 10 of this embodiment, as shown in FIG. 5, the tooth pieces 310 and 32 of the first to fourth yoke forming members 31 to 34 are molded during resin molding.
Since the outside of 0, 330, 340 is in contact with the mold 36, the tooth pieces 310, 320, 330, 340 are not deformed by the molding pressure and the like during the injection and molding of the resin, and Pieces 310, 320, 33
The size of the gap set between 0 and 340 does not change. Therefore, since the yoke 30 in which the tooth pieces 310, 320, 330, 340 are accurately arranged can be formed, the performance such as the step accuracy of the stepping motor 10 is improved.

As a material for forming the coating layer, an inorganic coating layer may be adopted regardless of the organic coating layer as long as it has insulation and heat resistance. Here, as the coating layer, for example, one used as a solid coating lubricant or the like can be used. Further, the motor provided with the yoke having the above structure is not limited to the PM stepping motor, but can be applied to, for example, a synchronous motor.

[0028]

As described above, in the motor according to the present invention, the insulating layer formed on the surface of the winding winding portion of the yoke and insulatingly separating the yoke and the armature winding is coated on the surface. It is characterized in that it is composed of a coating layer. Therefore, according to the present invention, the thickness of the insulating layer can be reduced, so that the volume of the winding winding portion is increased, and the linear product of the armature winding that can be wound therein is increased. Therefore, if the yoke has the same size, the output torque of the stepping motor can be increased, while if the output torque is the same, the motor can be downsized.

Here, even when the insulating layer is formed of a coating layer, the resin supply passage is formed in the flange portion of the yoke forming member forming the yoke, so that when the yoke is resin-molded, the inner periphery of the yoke is formed. Since the resin can be supplied to the outer peripheral side from the side through the resin supply passage, the resin terminal block can be simultaneously formed on the outer peripheral side of the yoke.

[Brief description of drawings]

FIG. 1 is a schematic sectional view schematically showing a structure of a main part of a stepping motor according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view schematically showing a structure of an armature of the stepping motor shown in FIG.

3 is a perspective view showing a structure of a yoke forming member which constitutes a yoke of the stepping motor shown in FIG.

4A is a side view showing the arrangement of yoke forming members in the yoke of the stepping motor shown in FIG.
(B) is a plan view showing a configuration of a resin supply passage formed in the flange portion.

5A to 5C are process cross-sectional views when molding the yoke of the stepping motor shown in FIG.

6A is an explanatory view showing a state in which a coating film is formed and a state in which an armature winding is wound after molding the yoke of the stepping motor shown in FIG. 1, and FIG. 6B is a schematic diagram thereof. FIG.

FIG. 7 is a perspective view showing a structure of a yoke forming member that constitutes a yoke of a conventional stepping motor.

8A is a partial sectional view showing the structure of an armature of a conventional stepping motor, and FIG. 8B is a sectional view thereof.

[Explanation of symbols]

 10 ... Stepping motor 14, 61 ... Magnet 15, 62 ... Shaft 20, 60 ... Armature 22, 57 ... Armature winding 23, 59 ... Terminal block 24, 58. ..Terminals 25, 54 ... Resin layers 30, 50 ... Yoke 31 ... First yoke forming member 32 ... Second yoke forming member 33 ... Third yoke forming member 34. ..Fourth yoke forming member 35, 324, 334 ... Resin supply passage 36 ... Mold 40 ... First winding winding portion 41 ... Second winding winding portion 42 ... Coating layer (insulating layer) 51 ... Yoke forming member 52, 310, 320, 330, 340 ... Collar portion 53, 311, 321, 331, 341 ... Tooth piece 55 ... Resin Layer (insulating layer) 56 ... Winding winding part 323, 333 ... Flat part 20a, 330a ··· contact surface

Claims (2)

[Claims] 1. A winding winding portion formed on a yoke of an armature and wound with an armature winding, wherein an insulating layer for insulating and separating the yoke and the armature winding is the winding winding. A motor characterized by being a coating layer formed on the surface of the turning portion. 2. The yoke according to claim 1, wherein a plurality of yoke forming members each having a flange portion partitioning and forming the winding winding portion are connected by an inner peripheral resin layer. The yoke forming member includes a yoke forming member in which the flange portions are in surface contact with each other, and the contact surface of the flange portion of at least one of the yoke forming members faces from the inner peripheral side toward the outer peripheral side. Formed so that resin can be supplied,
A motor characterized in that a resin supply passage for forming a resin terminal block for fixing terminals is formed on the outer peripheral side of the flange portion.