JP2012010466A - Rotating electrical machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating electrical machine which improves cooling performance.SOLUTION: A circular stator 5 and a groove 5b provided at an outer peripheral side of the stator 5 are shown in Figure 1. A coil housing part 2, which is fitted in the groove 5b and houses a coil 3, and a coil part 1, which is formed by a coil base 4 serving as a base on which the coil housing part 2 is placed, are shown in the groove 5a. Further, a rotating electrical machine is shown in the Figure 1. The rotating electrical machine has a supporting shaft 6 provided at a center portion of the stator 5, a rotor 7 rotatably attached to the supporting shaft 6 through a bearing 8, and a magnet attachment part 7b provided at the outer peripheral side of the rotor 7 and to which a permanent magnet positioned on both sides of the coil part 1 is attached.

Description

The present invention relates to a rotating electrical machine.

Currently, rotating electrical machines are used in devices that use various types of rotation. It is applied in a wide range of fields, from a motor for driving a vehicle to a small motor using rotation for linear motion. In these rotating electric machines, the current mainstream is an induction motor. It is widely used because it is inexpensive and robust. On the other hand, with the aim of miniaturization and high efficiency, recently, those using permanent magnets have been developed and applied to some products. To aim for further miniaturization and weight reduction, it is necessary to reduce the iron core that occupies more than half of the volume of the rotating electrical machine. Therefore, the development of iron core-less motors has been promoted recently.

  FIG. 16 is a cross-sectional view of a rotating electrical machine according to a conventional embodiment. A plurality of coil fixtures to which the coil 3 is attached are formed in a substantially circular shape, and are fixedly bonded to the coil base 4 formed in a substantially circular shape. The coil base 4 is fixed to a substantially circular mounting base 101 with a coil base mounting bolt 100. A cylindrical support shaft 6 is provided at the center of the mounting base 101, and a bearing 8 is provided at a part thereof. A circular rotating body 7 is provided via a bearing 8, and a permanent magnet 9 is provided on the rotating body 7 in a substantially circular shape with a certain gap with the coil 3 in the vicinity of the outer periphery thereof. With such a configuration, the rotating body 7 rotates and converts electrical energy into rotational energy. This configuration is an example, and there are various forms of ironless motors.

JP 2006-320109 A JP 2004-350427 A

However, the conventional rotating electrical machine described above has the following problems to be solved. The heat generated from the coil is conducted to the mounting base mainly by heat conduction, and is radiated from the surface of the mounting base to the atmosphere by natural convection. Therefore, it is important to reduce the thermal resistance from the coil to the mounting base. On the other hand, a resin material is used for the conventional coil mounting base to provide insulation. Since the resin material has a very high thermal resistance, the heat generated in the coil cannot be efficiently conducted. Further, the coil base and the mounting base are fixed not by bonding such as bolt fixing but by tightening. In the case of such a mounting method, there is a certain amount of contact near the bolt, and heat is conducted, but at a place away from the bolt, even though it seems to be in contact at first glance, there is actually an air layer. The heat resistance is large and it is difficult to transfer the heat of the coil to the mounting base.

This invention was made in order to solve said subject, The objective is to provide the cooling structure which can cool the heat which generate | occur | produced with the coil efficiently.

In order to solve the above, the rotating electrical machine according to the first embodiment of the present invention includes a circular stator, a groove portion provided with a groove on the outer peripheral side of the stator, and fitted into the groove portion to house the coil and the coil. A coil unit comprising a coil storage unit and a coil base that serves as a base on which the coil storage unit is installed, a support shaft provided at the center of the stator, and a rotation that is rotatably mounted from the support shaft via a bearing And a permanent magnet attachment portion that is provided on the outer peripheral side of the rotating body and attaches the permanent magnets located on both sides of the coil portion.

Sectional drawing of the rotary electric machine based on the 1st Embodiment of this invention. The perspective view of the coil fixture based on the 1st Embodiment of this invention. The perspective view of the coil part based on the 1st Embodiment of this invention. The assembly explanatory drawing of the stator based on the 1st Embodiment of this invention. The A arrow directional view of the stator of FIG. 1 of this invention. The perspective view of the 1st coil part based on the 1st Embodiment of this invention. The perspective view of the 2nd coil part based on the 1st Embodiment of this invention. The 1st sectional view of the rotary electric machine based on a 2nd embodiment of the present invention. Second sectional view of the rotating electrical machine according to the second embodiment of the present invention. Sectional drawing of the rotary electric machine based on the 3rd Embodiment of this invention. The perspective view of the 3rd coil part based on the 3rd Embodiment of this invention. The perspective view of the 4th coil part based on the 3rd Embodiment of this invention. The modification example figure of the stator based on the 3rd Embodiment of this invention. The modification example figure of the coil part based on the 3rd Embodiment of this invention. The modification example figure of the rotary electric machine based on the 3rd Embodiment of this invention. Sectional drawing of the rotary electric machine based on a prior invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
A first embodiment of the present invention will be described with reference to the drawings.

(Constitution)
Hereinafter, the configuration of the present embodiment will be described. FIG. 1 shows the present embodiment composed of a coil portion 1, a coil fixture 2, a coil 3, a coil base 4, a stator 5, a mounting base 5a, a groove portion 5b, a support shaft 6, a rotating body 7, a bearing 8, and a permanent magnet 9. It is a general view of the rotary electric machine of a form. FIG. 2 is an enlarged view of the coil fixture 2 of FIG. FIG. 3 is an enlarged view in which the coil 3 is wound around the coil fixture 2 of FIG. FIG. 4 is an explanatory view of an attachment method for attaching the coil attachment 2 around which the coil of FIG. 3 is wound to the stator 5. FIG. 5 is a view of the coil attachment 2 around which the coil of FIG. 3 is wound by the method of FIG. 4 and viewed from above.

  As shown in FIGS. 2 and 3, the coil fixture 2 has a shape in which the central portions of the coil attachment plate 2 a and the coil attachment plate 2 b are connected by a coil attachment connecting portion 2 c which is a separate member, and accommodates the coil. It plays a role as a coil storage part. The coil 3 is wound around the coil attachment connecting portion 2c. The coil fixture 2 around which the coil 3 is wound is installed on the coil base 4 and is fixed with an adhesive or the like to constitute the coil portion 1.

As shown in FIG. 4, the coil portion 1 has a circular groove 5 b provided on the side of the mounting base 5 a that is one surface of a stator 5 of a circular plate, and grease is moderated, and the coil base 4 is inserted from above. It is installed by being fixed. As shown in FIG. 5, a plurality of coil portions 1 are embedded in the groove portion 5b of the stator 5 to form a circle. As shown in FIG. 1, a support shaft 6 is fixed to the center portion of the stator 5, and a circular rotating body is supported rotatably from the support shaft 6 via a bearing 8. 7. On the outer peripheral portion of the rotating body 7 and the surface on the stator 5 side, there are a magnet attachment portion 7a and a magnet attachment portion 7b for attaching a permanent magnet so as to sandwich the coil portion 1 attached to the stator 5.

(Function)
Hereinafter, the operation of the present embodiment will be described. When a current is passed through the coil 3, a magnetic field is generated around the coil 3. A magnetic field is also generated in the permanent magnet on the rotating body 7 side. A rotating magnetic field is generated by the magnetic field on the coil side and the magnetic field on the rotating body 7 side. The rotating body 7 starts rotating by the rotating magnetic field. Heat is generated in the coil 3 to allow current to flow. Coil heat generated in the coil 1 is thermally conducted to the coil base 4 via the coil fixture 2. Thereafter, the coil heat passes through the contact portions of the three surfaces where the coil base 8 and the groove portion 5b of the stator 5 are in contact, is conducted to the stator 5, and is radiated by natural convection from the stator 5 to the atmosphere. Further, the coil heat diffuses from the stator 5 in the other member and is radiated by natural convection from the other member. In this way, the heat generated in the coil 1 is dissipated.

(effect)
As described above, since the mounting base 7 and the coil base 8 have many contact surfaces, the thermal conductivity is improved, and the temperature rise of the coil 1 can be suppressed. Therefore, the cooling performance of the rotating electrical machine is improved. By improving the cooling performance, a higher current can be passed through the coil 1 and the output of the rotating electrical machine is also increased.
In addition, the coil base 4 can be inserted into the groove 5b to reduce the axial length, thereby reducing the size.

  Furthermore, by filling the mounting base 7 and the coil base 8 with a material having high thermal conductivity such as grease, the above effect can be further increased.

  Conventionally, in order to fix the coil portion 1 to the mounting base 5a of the stator 5, a plurality of the coil portions 1 are fitted in a circular frame in advance, the shape is fixed, removed and then attached to the mounting base again. That work process was necessary. In the present embodiment, since the coil portion 1 can be directly attached and fixed to the groove portion 5b of the stator 5, a fixing frame for fixing the coil portion 1 or an insulating agent for maintaining the shape of the fixing frame of the coil. Etc. are no longer necessary. Therefore, the manufacturing method is simplified, and the use of an insulating material is eliminated, so that the thermal resistance between the stator 5 and the coil portion 1 can be reduced.

  As a modification of the coil fixture 2, FIG. 6 shows an L-shaped coil fixture 10, and FIG. 7 shows a T-shaped coil fixture 11. In the coil fixture 10 of FIG. 6, the coil base 4 shown in FIG. 2 is integrated with the coil fixture 2, and a plate for connecting the coil base 4 and the end of the coil fixture 2 is provided. It has a removed shape and serves as a coil storage portion for storing the coil 3. By configuring in this manner, the coil 3 can be formed by winding the coil 3 into a single circular shape and fitting the coil 3 into the coil fixture 10. Moreover, the coil fixture 11 of FIG. 7 is comprised by the coil attachment board 2a and the coil attachment coupling part 2c which were shown in FIG. By configuring in this way, the coil fixture 11 can be configured by winding the coil 3 alone in a circular shape and fitting the coil 3 into the coil fixture 11. In addition, it plays a role as a coil storage portion for storing the coil 3. Therefore, in the coil fixtures 10 and 11, it is not necessary to wind the coil 3 around the coil attachment connecting portion 2 c, so that the work process becomes easy.

(Second Embodiment)
A second embodiment according to the present invention will be described in detail with reference to the drawings. FIG. 8 is a first cross-sectional view of a rotating electrical machine based on the second embodiment of the present invention. FIG. 9 is a second cross-sectional view of the rotating electrical machine based on the second embodiment of the present invention. In addition, about the thing which has the same structure as FIG. 1 thru | or 7, the same code | symbol is attached | subjected and description is abbreviate | omitted.

In the present embodiment, unlike the first embodiment, the groove portion 5 b of the stator 5 has a crimping portion 12 and a crimping portion 13. This will be described in detail.

  As shown in FIG. 8, the crimping | compression-bonding part 20 is given to the groove part 5b. Before the crimping part 20 is installed in the groove part 5b, the coil part 1 formed in a circular shape is warmed and installed in the groove part 5b with the metal of the coil part 1 expanded. After installation, the coil part 1 is cooled and the metal of the coil part 1 is contracted, so that the contact pressure of the surface where the inner peripheral side of the coil part 1 and the groove part 5b are in contact with each other becomes very high. The crimping part 20 which is a surface with a high contact pressure also has a high heat traditional rate, and can efficiently cool the heat generated in the coil part 1.

Moreover, when installing the coil part 1 in the stator 5, as shown in FIG. 9, the inner peripheral side surface of the coil part 1 is inclined, and the inner peripheral side surface of the coil part 1 is formed on the inner peripheral side surface of the groove part 5b. By providing an inclination corresponding to the inclination provided on the side, a higher contact pressure is applied by performing shrink fitting on the crimping portion 13 which is a connection portion between the coil portion 1 and the stator 5. Since heat conductivity increases, it is possible to radiate heat generated in the coil portion 1 more efficiently.

(Third embodiment)
A third embodiment according to the present invention will be described in detail with reference to the drawings. FIG. 10 is a cross-sectional view of a rotating electrical machine based on the third embodiment of the present invention. FIG. 11 is a perspective view of the first coil portion based on the third embodiment of the present invention. FIG. 12 is a perspective view of the second coil unit according to the third embodiment of the present invention. In addition, about the thing which has the same structure as FIG. 1 thru | or 9, the same code | symbol is attached | subjected and description is abbreviate | omitted.

This embodiment is different from the first embodiment in the shape in which the coil base 4 of the coil portion 1 is deleted. This will be described in detail.

(Constitution)
The coil unit 30 is configured by winding the coil 3 around the coil fixture 2. As shown in FIG. 10, the coil part 30 is installed in the groove part 5b which made heavy weight etc. grease.

(Function)
Hereinafter, the operation of the present embodiment will be described. In order to generate a rotating magnetic field, a current is passed through the coil 3. When a current is passed through the coil 3, heat is generated from the coil 3. Coil heat generated in the coil 3 is conducted from the coil 1 to the stator 5. Thereafter, the coil heat repeatedly conducts heat from the stator 5 to other members and radiates heat to the atmosphere or radiates heat from the stator 5 to the atmosphere. The heat generated in the coil 1 by such natural convection is dissipated.

(effect)
As described above, the thermal conductivity is improved by bringing the coil portion 30 and the groove portion 5b into contact with each other.

By improving the thermal conductivity, the cooling performance of the rotating electrical machine is improved.

  11 and 12 show modifications of the coil unit 30. A coil fixture 31 of the coil unit 30 shown in FIG. 11 has a U-shape and serves as a coil storage unit that stores the coil 3. A coil attachment 32 of the coil portion 30 shown in FIG. 12 is surrounded by four surfaces, has a hollow chimney shape, and serves as a coil storage portion for storing the coil 3.

By configuring in this manner, the coil 3 can be formed by winding the coil 3 into a single circular shape and fitting the coil 3 into the coil fixture 10. Therefore, the work process becomes easy.

FIG. 13 shows a configuration of a stator integrated coil mounting portion 33 in which the coil mounting tool 2 is integrated with the stator 5. With such a configuration, it is not necessary to insert and fix the coil portion 1 in the groove portion 5b, and the coil 3 wound alone is installed in the integrated coil fixture 2. Therefore, the work process is simplified.

FIG. 14 shows a configuration in which a coil fixture 34 made of an insulating material is disposed between the wound coils 3 and installed on the mounting base 5a. With this configuration, it is easy to install the coil portion 30d including the coil 3 and the coil attachment 34 on the attachment base 5a.

FIG. 15 shows a configuration in which a plurality of radiating fins 35 are attached to the outer surface of the rotating body 7. With such a configuration, the heated air including the coil heat in the rotating electrical machine is promoted to be radiated to the outside. Therefore, the cooling performance of the entire rotating electrical machine is improved.

DESCRIPTION OF SYMBOLS 1 Coil part 1a Coil part 1b Coil part 2 Coil mounting tool 3 Coil 4 Coil base 5 Stator 5a Groove part 6 Supporting shaft 7 Rotor 7a Magnet mounting part 7b Magnet mounting part 8 Bearing 9 Permanent magnet 10 Coil mounting tool 11 Coil mounting tool 20 Crimp part 21 Crimp part 30 Coil part 30a Coil part 30b Coil part 31 Coil attachment 32 Coil attachment 33 Stator integrated coil attachment part 34 Coil attachment 35 Radiation fin

Claims (8)

A circular stator,
A groove portion provided with a groove on the outer peripheral side of the stator;
A coil part that is fitted in the groove part, and is composed of a coil, a coil storage part that stores the coil, and a coil base that serves as a base on which the coil storage part is installed;
A support shaft provided at the center of the stator;
A rotating body rotatably mounted from the support shaft via a bearing;
A magnet mounting portion that is provided on the outer peripheral side of the rotating body and attaches permanent magnets located on both sides of the coil portion;
Rotating electric machine having The rotating electrical machine according to claim 1, wherein the coil housing part has a rectangular parallelepiped cylinder and a coil can be inserted between the hollows. The rotating electrical machine according to claim 1, wherein the coil housing portion has a rectangular parallelepiped cylinder shape, and a coil can be inserted between the hollows in which one surface of the rectangular parallelepiped is cut out. The rotating electrical machine according to claim 1, wherein the coil housing portion has a rectangular parallelepiped shape, and a coil can be inserted between the hollows in which two surfaces of the rectangular parallelepiped are cut out. The rotating electrical machine according to claim 1, wherein the coil storage portion is provided with a protrusion at the center of a wide surface of a rectangular parallelepiped, and the protrusion is wound with a coil. The rotating electrical machine according to claim 1, wherein the coil housing portion is configured by a coil, a coil attachment for winding the coil, and a coil base on which the coil is installed. The rotating electrical machine according to claim 1, wherein the coil housing portion is constituted by a coil and a coil attachment for winding the coil.   6. The coil storage portion according to claim 1, wherein an inner peripheral side of the coil storage portion is inclined, and an inner peripheral side of the groove portion has an inclination equivalent to that of the coil base having the inclination. The rotating electrical machine described in 1.

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