JPH06217498A - Stator for motor and manufacture thereof - Google Patents

Abstract

PURPOSE:To allow downsizing of stator and thereby downsizing of motor by reducing the connecting space at an end of a coil on the side of central part. CONSTITUTION:Three stator cores 5 are arranged annularly on the base 3 of a stator 7 and a coil 6 is applied to the outer peripheral part of each stator core 5. The stator core 5 is made of a conductive and magnetic material, e.g. iron, and has an end part on the side of central part connected electrically with the stator core 5. The base 3 is also made of iron and connected electrically with each stator core 5. Since the stator core 5 is used as a terminal on the side of central part, connection thereat is facilitated and the connecting space is reduced resulting in downsizing of the stator 7 and the motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of a motor which can be miniaturized and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, in an axial gap type motor, for example, a plurality of coils formed by winding a copper wire are attached to a printed wiring board by adhesion or the like, and the central side and outer peripheral side of the coils are mounted. Both terminals are soldered to the wiring pattern of the printed wiring board to form a stator, and a rotor provided with a permanent magnet and a rotating shaft is attached to the stator via a bearing so that the permanent magnet faces the coil. There is a configuration in which it is rotatably arranged.

[0003]

By the way, in a motor of this type, when it is attempted to miniaturize it, it is difficult to solder the end of the coil and the printed wiring board, particularly the end of the coil on the central side. It became difficult to secure a space for soldering the winding start end portion, which was one obstacle in miniaturizing the motor.

Therefore, one of the objects of the present invention is to provide a motor stator which can reduce the connection space of the end portion of the coil on the central portion side, and accordingly can reduce the size of the stator and hence the size of the motor. In particular, another object of the present invention is to provide a stator manufacturing method suitable for manufacturing such a stator.

[0005]

According to a first aspect of the present invention, in a stator of a motor having a plurality of coils each wound around a stator core, the stator core is formed of a conductive magnetic material, It is characterized in that the ends on the central side of each coil are electrically connected to the stator core.

In the stator of the motor according to claim 1, it is preferable that each stator core to which the coil is connected is electrically connected to a base made of a magnetic material having conductivity (invention of claim 2).

According to a third aspect of the present invention, as a method for manufacturing a motor stator, a conductive plate coated with an insulating adhesive is wound in a cylindrical shape and the adhesive is cured to produce a wound plate body. A plurality of coils are manufactured by cutting so as to traverse the winding plate body, and the plurality of coils are fitted to the outer peripheral portion of a stator core having a columnar shape made of a magnetic material having conductivity, and It is characterized in that the winding start end is electrically connected to the stator core.

According to a fourth aspect of the present invention, as a method for manufacturing a motor stator, a conductive plate coated with an insulating adhesive is wound in a tubular shape and the adhesive is cured to produce a wound plate body. A plurality of winding plate bodies are arranged in an annular shape, these are molded with an insulating resin, and the molded product is cut so as to traverse each of the winding plate bodies to manufacture a coil molded body having a plurality of coils. Then, each coil of this coil molded body was fitted to the outer peripheral portion of the columnar stator core made of a magnetic material having conductivity, and the winding start end portion of each coil was electrically connected to the stator core. However, it has a feature.

According to a fifth aspect of the present invention, as a method of manufacturing a motor stator, one end of a conductive plate is electrically connected to a columnar stator core made of a magnetic material having conductivity, and the conductive plate is made of an insulating material. It is wound around the outer periphery of the stator core via an adhesive, and the adhesive is cured to produce a wound plate body,
A plurality of coils are manufactured by cutting so as to traverse this winding plate body, and the plurality of coils are annularly arranged on a magnetic base having conductivity, and the stator core of each coil is used as a base. It is characterized by being electrically connected to.

According to a sixth aspect of the present invention, as a method of manufacturing a motor stator, one end of a conductive plate is electrically connected to a columnar stator core made of a magnetic material having conductivity, and the conductive plate is made of an insulating material. It is wound around the outer periphery of the stator core via an adhesive, and the adhesive is cured to produce a wound plate body,
A plurality of the winding plate bodies are arranged in a ring shape, and these are molded with an insulating resin, and the molded product is cut so as to traverse each of the winding plate bodies to form a coil molded body having a plurality of coils. It is characterized in that it is manufactured, and this coil molded body is arranged on a base made of a magnetic material having conductivity, and each stator core is electrically connected to the base.

[0011]

According to the invention of claim 1, since the stator core is used as the terminal on the central portion side of the coil, the connection of the end portion on the central portion side of the coil is facilitated and the connection space can be reduced. As a result, it is possible to cope with the miniaturization of the stator and hence the miniaturization of the motor.

According to the second aspect of the invention, since each stator core to which the ends of the coils are connected is connected to the common base, the external connection can be performed through the base, and the connection can be made. Work becomes easier.

According to the third aspect of the invention, the coil can be easily manufactured, and moreover, the winding start end of the coil and the stator core can be easily electrically connected.

According to the invention of claim 4, since a plurality of coils can be manufactured at the same time, mass productivity is excellent, and since a plurality of coils can be handled as one body, they can be assembled. It will be easy.

According to the fifth aspect of the invention, since the winding start end of the coil is connected to the stator core in advance when manufacturing the coil, the winding start end of the coil and the stator core can be easily connected. Further, the plurality of coils may be arranged on the base together with the stator core.

According to the invention of claim 6, since a plurality of coils having a stator core can be manufactured at the same time, the mass productivity is excellent, and the plurality of coils can be handled as one body. Therefore, it is easy to assemble.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, in FIG. 1, a thrust bearing body 1 has a circular shape, and a concave thrust bearing portion 2 having a V-shaped cross section is formed in a central portion. A magnetic material having conductivity, for example, an iron base 3 is fixed to the upper surface of the thrust bearing body 1 by adhesion or the like.

The base 3 has a circular shape corresponding to the thrust bearing body 1, and a cylindrical sleeve bearing 4 is fixed to the central portion corresponding to the thrust bearing portion 2. On the upper surface of the base 3, three magnetic cores having conductivity, for example, three stator cores 5 made of the same iron as the base 3 and having a short columnar shape are arranged in an annular shape. Each stator core 5 is adhesively fixed to the upper surface of the base 3 with, for example, a conductive adhesive (not shown), and is electrically connected to the base 3.

A coil 6 is wound around the outer periphery of each stator core 5. The coil 6 is formed by winding a large number of times while maintaining insulation in each layer in a state where one end of a conductive plate made of, for example, copper foil is electrically connected to the outer peripheral portion of the stator core 5. An insulating layer (not shown) is provided on the upper surface of the base 3 to ensure insulation with the end surface of the coil 6 on the base 3 side.

Here, the thrust bearing body 1, the base 3, the sleeve bearing 4, the three stator cores 5, and the three coils 6 constitute a stator 7 of the motor. In addition,
The base 3 having a common potential with the end of each coil 6 on the center side
Then, the ends (terminals) on the outer peripheral side of each coil 6 are connected to a drive circuit (not shown).

With respect to the stator 7, the rotor 8 includes a rotor yoke 9 having a circular shape, a rotary shaft 10 fixed to a central portion of the rotor yoke 9, and an annular permanent magnet fixed to a lower surface of the rotor yoke 9. The rotary shaft 10 is rotatably supported by the thrust bearing portion 2 in a state in which the rotary shaft 10 is rotatably inserted in the sleeve bearing 4. The permanent magnet 11 is magnetized to have two poles in the plane and faces the coil 6 with a predetermined gap.

In the above configuration, the rotor 8 is rotated by the magnetic field generated in each coil 6 and the magnetic field of the permanent magnet 11 of the rotor 8 based on the control of the energization of the three coils 6 by the drive circuit. At this time, the base 3 which is the common potential of each coil 6 is shared with the ground of the coil power supply, so that the motor becomes a three-phase half-wave drive, and by insulating the base 3 from the power supply, the three-phase It becomes a full wave drive motor.

According to the first embodiment described above, the end of the coil 6 on the center side is electrically connected to the stator core 5, and the stator core 5 is used as a terminal on the center side of the coil 6. Therefore, the end of the coil 6 on the center side, that is, the winding start end can be easily connected and the connection space can be reduced. As a result, the winding diameter of the coil 6 can be reduced, the stator 7 can be downsized and the motor can be downsized easily, and a highly reliable small motor can be manufactured.

Further, since the coil 6 is small, it has the stator core 5 made of a magnetic material in the central portion thereof, so that the magnetic flux generated in the coil 6 is increased and the torque of the motor can be improved. Further, conventionally, it is necessary to electrically insulate the stator core and the coil, and it is necessary to perform insulation treatment on the stator core, but in the present embodiment, there is an advantage that the insulation treatment of the stator core 5 is unnecessary.

Further, since the respective stator cores 5 to which the ends of the coils 6 are connected are connected to the common base 3, the connection with the outside can be performed through the base 3, and the connection work is further improved. It has the advantage of being easy.

3 and 4 show a second embodiment of the present invention. This second embodiment differs from the above-mentioned first embodiment in the following points. That is, in the first embodiment,
The coil 6 is formed by winding a conductive plate around the outer peripheral portion of the stator core 5, but in the second embodiment, the conductive plate is wound in advance in a short cylindrical shape to form the coil 6, and the short cylindrical coil is formed. 6 is fitted to the outer peripheral portion of the stator core 5, and the winding start end of the coil 6 is electrically connected to the outer peripheral portion of the stator core 5.

At this time, the coil 6 may be manufactured by the method shown in FIG. That is, an insulative adhesive (not shown) is applied to one side or both sides of a long conductive plate 12 having a width dimension several times that of the coil 6, and the conductive plate 12 is wound into a cylindrical shape. Then, the winding plate 13 is manufactured by curing the adhesive. After that, the winding plate body 13 is cut so as to traverse the winding plate body 13 with a width corresponding to the width dimension of the coil 6 as shown by a dotted line a in FIG.
The coil 6 is manufactured.

According to the second embodiment as described above, a plurality of coils 6 can be manufactured from one winding plate body 13, so that the coils 6 can be easily manufactured, and the coils 6 can be mounted on the stator core 5. Since these can be electrically connected to each other by fitting to, the winding start end of the coil 6 and the stator core 5 can be easily electrically connected.

5 and 6 show a third embodiment of the present invention. The third embodiment differs from the first and second embodiments in the following points. That is, three winding plate bodies 13 in the second embodiment are annularly arranged in a molding die (not shown), and these are molded with the insulating resin 14 to produce a cylindrical molded product 15 shown in FIG. To do. Thereafter, this molded product 15 is cut so as to traverse each winding plate body 13 with a width corresponding to the width dimension of the coil 6, as shown by the dotted line B in FIG. The coil molded body 16 provided with is manufactured.

Then, each coil 6 of this coil molded body 16 is fitted to the outer peripheral portion of the stator core 5 on the base 3, and the winding start end portion of each coil 6 is electrically connected to the stator core 5 to form a coil. The molded body 16 is placed on the base 3.

According to the third embodiment, since the three coils 6 can be manufactured at the same time, the mass productivity is excellent, and the three coils 6 can be handled as one body. Therefore, there is an advantage that it is easy to assemble.

7 and 8 show a fourth embodiment of the present invention. The fourth embodiment is different from the first to third embodiments described above in the following points. That is, one end of the conductive plate 12 coated with an insulating adhesive on one side or both sides is electrically connected to an outer peripheral portion of a conductive magnetic body, for example, a cylindrical core 17 made of iron. The conductive plate 12 is wound around the outer periphery of the winding core 17, and the adhesive is cured to produce the wound plate body 18. After this, the rolled plate 18
7 is cut so as to traverse the winding plate body 18 with a width corresponding to the width dimension of the coil 6, as shown by the dotted line C in FIG. 6 is manufactured.

The three coils 6 thus manufactured are arranged in an annular shape on the base 3, and each stator core 5 is attached to the base 3.
To be electrically connected to.

According to the fourth embodiment, when the coil 6 is manufactured, the winding start end portion of the coil 6 is connected to the winding core 17 which is the stator core 5 in advance. Can be easily connected to the stator core 5. Also, 3
The individual coils 6 can be arranged on the base 3 together with the stator core 5.

9 and 10 show the fifth embodiment of the present invention. The fifth embodiment differs from the above-described first to fourth embodiments in the following points. That is, three winding plate bodies 18 in the fourth embodiment are annularly arranged in a molding die (not shown), and these are molded with the insulating resin 14 to form a cylindrical molded article 1 shown in FIG.
Produce 9. Thereafter, this molded product 19 is cut so as to traverse each winding plate body 18 with a width corresponding to the width dimension of the coil 6, as shown by a dotted line D in FIG. A coil molded body 20 having 5 and 3 coils 6 is produced.

Then, the coil molded body 20 is used as a base 3
The stator cores 5 are arranged on the upper side and electrically connected to the base 3.

According to the fifth embodiment, since the three coils 6 each having the stator core 5 can be manufactured at the same time, the mass productivity is excellent, and the three stator cores and the coils 6 are provided. Since it can be handled as an integral body, there is an advantage that it is easy to assemble.

In each of the above embodiments, the permanent magnet 1
Although the number of magnetic poles of 1 is 2 poles and the number of coils 6 is 3, the number of magnetic poles of the permanent magnet 11 is 2n poles (where n is an integer of 1 or more), and the coil 6 if the rotor 8 can rotate. Is 3
It may be more than one. Further, the present invention is not limited to the axial gap type but can be applied to a radial gap type motor.

[0039]

According to the stator of the motor of the first aspect, since the stator core is used as the terminal on the central portion side of the coil, the connection of the end portion on the central portion side of the coil becomes easy. At the same time, the connection space can be reduced, and accordingly, the miniaturization of the stator and the miniaturization of the motor can be coped with, and the torque of the motor can be improved.

According to the stator of the motor of the second aspect, since each stator core to which the ends of the coils are connected is connected to a common base, the external connection can be performed via the base. The connection work can be further facilitated.

According to the method of manufacturing the motor stator of the third aspect, the coil can be easily manufactured, and the winding start end portion of the coil and the stator core can be easily electrically connected.

According to the method of manufacturing a motor stator as set forth in claim 4, since a plurality of coils can be manufactured at the same time, mass productivity is excellent, and the plurality of coils are handled as an integral body. Since it can be assembled, it can be easily assembled.

According to the motor stator manufacturing method of the fifth aspect, when the coil is manufactured, the winding start end of the coil is connected to the stator core in advance. Therefore, the winding start end of the coil and the stator core are connected to each other. Easy to connect. Also,
The plurality of coils may be arranged on the base together with the stator core.

According to the method of manufacturing a stator of a motor of claim 6, since a plurality of coils having a stator core can be manufactured at the same time, mass productivity is excellent, and a plurality of coils can be manufactured. Since it can be handled as an integrated body, it can be easily assembled.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a motor according to a first embodiment of the present invention.

FIG. 2 is a plan view of a stator

FIG. 3 is an exploded perspective view of essential parts showing a second embodiment of the present invention.

FIG. 4 is a perspective view of a winding plate body.

FIG. 5 is a perspective view of a molded product showing a third embodiment of the present invention.

FIG. 6 is an exploded perspective view of a main part.

FIG. 7 is a perspective view of a winding plate body showing a fourth embodiment of the present invention.

FIG. 8 is an exploded perspective view of essential parts.

FIG. 9 is a perspective view of a molded product showing a fifth embodiment of the present invention.

FIG. 10 is an exploded perspective view of essential parts.

[Explanation of symbols]

3 is a base, 5 is a stator core, 6 is a coil, 7 is a stator, 8 is a rotor, 12 is a conductive plate, 13 is a winding plate body, 14
Is an insulating resin, 15 is a molded product, 16 is a coil molded product, 17 is a winding core, 18 is a winding plate member, 19 is a molded product, and 20 is a coil molded product.

Claims (6)

[Claims] 1. A stator of a motor comprising a plurality of coils each wound around a stator core, wherein the stator core is formed of a magnetic material having conductivity, and the ends of the respective coils on the central side are A motor stator characterized by being electrically connected to a stator core. 2. Each stator core to which a coil is connected,
The motor stator according to claim 1, wherein the stator is electrically connected to a base made of a magnetic material having electrical conductivity. 3. A conductive plate coated with an insulating adhesive is wound in a tubular shape, the adhesive is cured to produce a wound plate body, and the wound plate body is cut so as to traverse the wound plate body. Coil was manufactured, and the plurality of coils were fitted to the outer peripheral portion of the columnar stator core made of a conductive magnetic material, and the winding start end of the coil was electrically connected to the stator core. And a method for manufacturing a stator of a motor. 4. A conductive plate coated with an insulating adhesive is wound in a tubular shape, and the adhesive is cured to produce a wound plate body. Molded with an insulating resin, the molded product is cut so as to traverse each of the winding plate bodies to manufacture a coil molded body having a plurality of coils, and each coil of the coil molded body is electrically conductive. And a winding start end of each coil is electrically connected to the stator core while being fitted to the outer peripheral portion of a magnetic core having a columnar shape. 5. A conductive plate is electrically connected at one end to a columnar stator core made of a magnetic material having conductivity, and the conductive plate is wound around an outer peripheral portion of the stator core via an insulating adhesive. The adhesive is cured to produce a winding plate body, and a plurality of coils are produced by cutting the winding plate body so as to traverse the winding plate body. The plurality of coils are made of a conductive magnetic material. A stator manufacturing method for a motor, characterized in that the stator cores of the coils are electrically connected to the base while being arranged annularly on the base. 6. One end of a conductive plate is electrically connected to a columnar stator core made of a magnetic material having conductivity, and the conductive plate is wound around an outer peripheral portion of the stator core via an insulating adhesive. Then, the adhesive is cured to produce a winding plate body, a plurality of winding plate bodies are arranged in an annular shape, and these are molded with an insulating resin, and the molded product is made to traverse each of the winding plate bodies. A coil molded body having a plurality of coils was cut by cutting into pieces, and the coil molded body was placed on a base made of a magnetic material having conductivity, and each stator core was electrically connected to the base. A method of manufacturing a motor stator, which is characterized.