JP2005287112A - Motor core, rotator for motor and stator employing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor core having high insulation performance in which eddy current loss of a motor can be reduced, electrical characteristics can be enhanced, and the thickness, size and weight can be reduced, and to provide a rotator for motor and a stator employing it. <P>SOLUTION: On the surface of a resin film, a film of a magnetic body or an insulating material mixed or not mixed with a magnetic body is provided, and a multilayer film formed by laying a plurality of the insulation films or a sheet of single layer film is punched or etched into the shape of motor core. When the insulating material not mixed with the magnetic body is provided in the core, insulation is enhanced by arranging a magnetic body film between the insulation films laid in layer. The resin film is composed of resin produced by mixing one kind or more of insulating resin, e.g. flexible epoxy resin, polyimide resin, polyamide resin, fluororesin, peak resin, and the like. The rotor for motor is provided with winding around the core and fixed with a rotary shaft. The stator for motor is provided with winding around the core. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a core, a rotor, and a stator for a small motor used in, for example, a mobile phone and a hard disk of a personal computer.

  Conventionally, cores for various motors such as induction motors and DC motors are formed by laminating thin metal plates such as silicon steel in order to reduce iron loss. In addition, a winding is wound around the core to form a rotor and an armature, and these are incorporated to form a motor.

However, conventional motor cores formed by laminating metal plates and rotors and stators using the same have the following problems.
(1) Since it is made of metal, it is inferior in insulation, eddy current loss occurs, and the motor operation efficiency is poor.
(2) The vibration of the core is generated by the natural vibration of the metal, which adversely affects the rotation of the motor. When used for a long period of time, the core of the motor may be displaced and the motor may be damaged.
(3) The core for the motor, and the rotor and stator using it were large and heavy.
(4) During operation of the motor, the motor core may heat up, and the entire motor may become hot, which may adversely affect the motor and surrounding parts.

  The present invention relates to a motor core that has almost no eddy current loss or natural vibration, can be thinned, reduced in size, reduced in weight, and generates less heat, and a motor rotor and stator using the same.

  The motor core of the present application is a laminated film or a single sheet in which a surface of a resin film is provided with a magnetic material or an insulating material mixed with a magnetic material or a film of an insulating material not mixed with a magnetic material, and a plurality of the insulating films are laminated. Is formed into the shape of a motor core by punching or etching. In the case where the core is provided with a film of an insulating material that does not contain a magnetic material, the magnetic film is disposed between the laminated insulating films to enhance the insulation. The resin film was made of a resin obtained by mixing one or more insulating resins such as a flexible epoxy resin, a polyimide resin, a polyamide resin, a fluororesin, and a peak resin.

  In the motor rotor of the present invention, a winding is provided on the motor core and a rotating shaft is attached. The motor stator according to the present invention is such that a winding is provided on the motor core.

The motor core of the present application has the following effects.
(1) Since the surface of the resin film is made of an insulating film with a magnetic material or an insulating material film with or without magnetic material mixed in, the insulation performance is high, the eddy current loss of the motor can be reduced, and the electrical characteristics can be reduced. Can be improved.
(2) Since the resin film is used, the motor core can be made thin, small and light. For this reason, the rotor and stator for motors using them, and the motor combining them can be reduced in thickness, size and weight.
(3) Since a resin film is used, it is difficult to generate heat and there is no adverse effect on the motor and surrounding parts.
(4) Since a resin film is used, there is less natural vibration than a metal core, less vibration is generated in the core, and it is difficult to adversely affect the motor.
(5) By selecting the number of laminated insulating films, it is possible to obtain a core, rotor, and stator having a thickness suitable for the application.

  When using an insulating film provided with an insulating film that does not contain magnetic material, the magnetic film or film is placed between the insulating films to be laminated. Can do.

Since the resin film is made of a resin obtained by mixing one kind or two or more kinds of insulating resins such as a flexible epoxy resin, a polyimide resin, a polyamide resin, a fluororesin, and a peak resin, in addition to the above effects, There is also an effect like this.
(1) These resins not only have high insulation properties, but also high heat resistance, low electrical loss, and excellent impact resistance and high voltage resistance. Not only is it improved, but the service life of the motor core and motor is also increased.

Since the rotor and stator of the present application are formed by winding a winding around the motor core, the following effects are obtained.
(1) Insulation performance is high, eddy current loss can be reduced, and electrical characteristics can be improved.
(2) A smaller, thinner and lighter weight than conventional rotors and stators can be realized.
(3) In the case of a rotor, the natural vibration is reduced, misalignment is less likely to occur, and the motor is less likely to be adversely affected.
(4) A sufficient magnetic field can be generated, and the operating efficiency of the motor is improved.
(5) It has high insulating properties and not only improves electrical characteristics, but also extends its useful life.

(Embodiment 1)
One example of an embodiment of a motor core of the present invention and a motor rotor and stator using the same will be described in detail with reference to the drawings. A motor core 1a shown in FIG. 1 (a) is a rotor core for a motor, and is formed into a star shape by punching or etching a laminated film 3 in which a plurality of insulating films 2 are laminated as shown in FIG. is there. A motor core 1b shown in FIG. 1B is a stator core for a motor, and is formed by punching or etching a laminated film 3 in which a plurality of insulating films 2 are laminated as shown in FIG. 2 into a donut shape. is there.

  The insulating film 2 is obtained by providing an insulating film on the surface of a resin film. The insulating film is formed of a highly insulating resin such as glass epoxy. The thickness of the insulating film is preferably several nm to several tens of nm, but can be any thickness. The resin film is made of a resin obtained by mixing any one or two or more functional resins such as an insulating resin such as a flexible epoxy resin, a polyimide resin, a polyamide resin, a fluororesin, and a peak resin. In addition, the resin film is not limited to an insulating resin, and an arbitrary resin film such as a normal resin film having no insulating property such as polyester can be used. The thickness of the insulating film 2 is preferably about 5 μm to 0.5 mm, but can be any thickness.

  As shown in FIG. 3, the insulating film can be formed by a dip coating process in which resin films 21 are sequentially immersed in a plurality of liquid tanks 20. In each liquid tank 20, various liquids necessary for forming an insulating film, such as an insulating material solution, a reaction liquid, and a cleaning liquid, are provided in a predetermined order. The insulating film is not limited to the dip coating process, and can be formed by any method such as plating with an insulating material, or spraying or applying an insulating material. Further, the insulating film of the insulating film 2 may be mixed with a magnetic material such as iron oxide, chromium oxide, cobalt, ferrite, or other materials, and coated on the insulating resin film 21 at the same time as the insulating film is formed. Is possible.

  As shown in FIG. 2, the laminated film 3 is a member formed by laminating a plurality of the insulating films 2. However, the number of laminated insulating films 2 is not limited to the number (10) shown in the figure, and can be increased or decreased as compared with the case of FIG. In addition, the magnetic material and other materials are not coated on the resin film 21 as described above, but are formed into a film or a film, and each of the laminated layers is formed as shown in FIG. It can also be arranged between the insulating films 2 (see 4 in the figure). However, the magnetic film (film) 4 can also be formed by spreading or applying magnetic powder between the insulating films 2. Each laminated insulating film 2 and magnetic film (film) 4 are fixed by any fixing means such as fusion, bonding with an adhesive or the like, or fixing with an insulating stopper. The total thickness of the laminated film 3 is desirably several tens of μm to several mm, but is not limited thereto, and can be an arbitrary thickness. The thickness of the magnetic film (film) 4 can also be set to an arbitrary thickness.

  As shown in FIG. 1A, a motor core 1a, which is a rotor core for a motor, is formed by forming the laminated film 3 into a star shape. In the motor core 1a shown in the figure, a shaft hole 6 is opened at the center of a disk-shaped core body 5, and the outer periphery of the core body 5 extends in the radial direction of the core body 5 and is wound with a winding. Three possible protrusions 7 are formed. The motor core 1a of the present invention is formed by punching the laminated film 3 into a star shape as shown in FIG. 1A by a press machine or the like, or removing unnecessary portions from the laminated film 3 chemically or electrochemically. It is removed by etching into a star shape as shown in FIG. As the etching, any method such as dry etching using a gas, wet etching using a chemical solution, or sputter etching using energy particles can be used.

  As shown in FIG. 1B, a motor core 1b, which is a stator core for a motor, is formed by forming the laminated film 3 into a donut shape. In the motor core 1b shown in the figure, a rotor hole 9 is opened at the center of a ring-shaped core body 8, and the inner periphery of the rotor hole 9 of the core body 8 is directed toward the center of the core body 8. Four protrusions 10 that can be wound and wound with windings are formed. Similarly to the motor core 1a, the motor core 1b of the present invention is formed by punching or etching the laminated film 3 into a donut shape as shown in FIG.

  The motor rotor of the present invention has a coil formed by winding a winding around the projection 7 of the motor core 1a shown in FIG. 1 (a). The shaft hole 6 is provided with a rotating shaft, and a bearing, a commutator, etc. The other parts are provided.

  The motor stator of the present invention is formed by winding a coil around the protrusion 10 of the motor core 1b shown in FIG. 2 (b) to form a coil, and housing the motor core 1b in a case. is there.

  The motor using the motor rotor and the stator according to the present invention is formed by inserting the rotor including the motor core 1a into the rotor hole 9 of the stator including the motor core 1b. . In this case, it is desirable to use a fluid bearing as the motor bearing, but any bearing can be used.

(Other embodiments)
The motor core of the present invention can also be formed by a single layer film provided with only one sheet without laminating the films.

  The shape of the motor core of the present invention is not limited to that shown in FIGS. 1 (a) and 1 (b), and can be any shape as long as it can be used as a rotor or stator core. Therefore, the number of protrusions is not limited to the above-mentioned number.

  The motor core and the motor rotor and stator using the motor core according to the present invention are not limited to small motors used for mobile phones, personal computer hard disks, etc., but are used for automobiles, large machine tools, and the like. This can also be applied to other motors.

(A) is a top view which shows an example of embodiment of the core for motors of this invention. (B) is a top view which shows another example of embodiment of the core for motors of this invention. The front sectional view of the lamination film for formation of the core for motors of the present invention. Explanatory drawing which shows the mode of the process of the resin film used as the material of the core for motors of this invention.

Explanation of symbols

1a Motor core (for rotor)
1b Motor core (for stator)
2 Insulating film 3 Laminated film 4 Magnetic film or film

Claims (5)

  On the surface of the resin film, a magnetic material or an insulating material mixed with a magnetic material or a film of an insulating material not mixed with a magnetic material is provided, and a laminated film or a single layer film in which a plurality of the insulating films are laminated is punched or A motor core characterized by being formed into the shape of a motor core by etching.   2. The motor core according to claim 1, wherein when an insulating film provided with an insulating material film not mixed with a magnetic material is laminated, the magnetic material film and the film are arranged between the insulating films. core.   3. The motor core according to claim 1, wherein the resin film is a mixture of one or more insulating resins such as a flexible epoxy resin, a polyimide resin, a polyamide resin, a fluororesin, and a peak resin. Motor core characterized by being made of resin.   A motor rotor, wherein a winding is wound around the motor core according to any one of claims 1 to 3, and a rotary shaft is attached. A stator for a motor, wherein a winding is provided on the motor core according to any one of claims 1 to 3.

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