JPS62233046A - Core-insulating cap for skew type motor - Google Patents

Abstract

PURPOSE:To obtain a cap fitted on and insulated from the yoke of a core, by forming the cap with specified substance to set the thickness to come to a specified value or lese value. CONSTITUTION:Through both the end sections of a core l, a cap 5 made of resin is fitted. The cap 5 has a plurality of radial groove sections 6a, 6b......fitted on the yoke section of the core l. The cap 5 is integrally formed with polyamide, or the substance of polyanmide compounded with 5-20 wt% glass fiber, and the thickness is set to he l mm or less.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a method for insulating the windings of a motor core, in which a cap made of an insulating resin is inserted into the core to insulate the windings of a motor core. It is widely used in skew type motors that have no torque unevenness during rotation.

(Prior art) As the prior art related to the present invention, (1) Unexamined Japanese Patent Publication No. 47-2
There is a publication of No. 4501 "Insulation method for electrical equipment".

This method discloses a method for insulating the core of a motor by spraying or coating the surface of an object to be insulated with liquid resin such as epoxy resin or powdered mica. (2) A circular cap made of insulating resin and having a groove that fits into a radially formed yoke, which is a winding portion of the motor core, is fitted from both ends of the motor core. To explain this with reference to FIG. 6(A), A is a stacked standard type motor core, which has a core L, a throttle 3 for winding the motor shaft 21, and a winding part on the core. radial yoke 4a,
A large number of 4b... are arranged.

FIG. 2 shows a cap 5 made of phenol resin or melamine resin that fits into this laminated core.

The cap 5 has radiation grooves 6a, 6b, etc., which fit into the yokes 4a, 4b, etc., and the collar portion 7, which is inserted into and held by the motor shaft 2, is 1. It is physically formed. The cap 5 is inserted from both sides of the motor core A as shown at 8 to form an insulating section.

FIG. 6(b) is a cross-sectional view of a portion of the yoke with the cap inserted from both sides, where 4a shows the yoke and 6a shows a part of the cap.

(Problems to be Solved by the Invention) However, the method of insulating the motor core, the resin or powder coating method in (1), depends on the amount of mixed resin and powder to be sprayed, the concentration of liquid, and the amount of spraying. There is also the problem that it takes a lot of man-hours to control the drying temperature, drying time, etc. Furthermore, the method (2) of inserting resin caps from both sides of the motor core to insulate the core When the throttle is straight, it is possible to insert a resin cap with a wall thickness of 1 or more.However, in a skew type motor core where the core is laminated at an angle, the groove of the cap made of phenol resin or melamine resin is inserted into the core. Since the yoke of the cap is slanted, it is difficult to insert the cap, and there is a risk of the cap breaking if the cap is inserted forcefully.Furthermore, the cap is molded from resin so that the groove portion thereof has an inclination angle with respect to the center line. The problem is that it cannot be molded due to undercuts.

The present invention relates to the insulation of a skew-type motor core in which the motor core part has a sloped shape.Instead of spraying the material to be insulated, the present invention proposes a resin that can be insulated by fitting the groove of a cap made of insulating resin into the yoke of the core. The technical problem is to provide a cap made of aluminum.

[Structure of the invention]

(Means for solving the problems) The technical measures taken to solve the above problems are as follows. In other words, in a skew type motor in which cores are diagonally stacked, the resin cap, which has a large number of radial grooves that fit into the yoke portion of the core, is formed from both end surfaces of the stacked cores and is made of polyamide or polyamide with glass fiber. 5 to 20% by weight and molded into one piece, and the thickness of the resin cap is 11 cm or less, and this resin cap is fitted to the core to form the insulating part of the skew type motor core. It is.

(Operation) The technical means operates as follows. In other words, a resin cap made of polyamide resin or polyamide resin mixed with glass fiber has excellent heat resistance and a high heat deformation temperature, and is extremely flexible when the wall thickness is 1 mm or less, making it suitable for use on skew-type motor cores. It can be easily inserted into the throttle by pushing it forcefully by hand. In this case, strong press-fitting by a jig or cracking or cracking of the resin due to press-fitting will not occur at all. Glass fiber content is 5-20% by weight
is appropriate, and the resin wall thickness can be reduced to about 0.5 W.

(Example) Examples will be described below.

FIG. 1 shows a skew type motor core, in which 1 is a core made of a silicon steel plate, 2 is a motor shaft, and 3 is a throttle, which are formed in an inclined shape.

The resin cap 5 shown in FIG. 2 is molded from polyamide resin and has a wall thickness of 0.5 n+. In this case 20-5
Glass fibers having a length of 0 μm and 5 fins or less may be mixed in an amount of 5 to 20% by weight, and by blending glass fibers, the thickness can be further reduced. To explain the method of inserting the cap 5 into the motor core 1 with reference to FIG. 3, the cores are shifted and stacked in an inclined manner as shown in FIG. Insert caps 5a and 5b (indicated by chain lines) from both sides of the motor core. In this case, if the grooves 6a, 6b, . . . of the cap are aligned with the yoke direction of the core and the cap is firmly inserted, the cap will fit into the core. Third
Figure (c) shows a skew type core with caps inserted from both sides.

〔Effect of the invention〕

The present invention has the following effects. In other words, to insulate the winding part of the motor core, there is a method of inserting insulating paper into the slot part, which has a high dielectric strength and is used in small, high-power motors. However, the method of inserting the cap made of the flexible resin material of the present invention is extremely simple and has excellent electrical insulation, making it suitable for automobiles and other applications. It is also widely used in various OA equipment.

[Brief explanation of drawings]

Figure 1 is a plan view of the laminated core of the skew type motor, Figure 2 is an external perspective view of the core insulation cap, and Figure 3 is the
Figure 3 (A) is before assembly, Figure 3 (B) is during assembly, and Figure 3 (C) is an explanatory diagram of the process of assembling the cap shown in the figure to the core.
indicates the state of completion of assembly. FIG. 4 is an external perspective view of this example, FIG. 5 is a sectional view taken along line DD in FIG. 4, FIG. Figure 6 (
It is a CC sectional view of a).

Claims (1)

[Claims] For insulating the diagonally stacked cores of skew type motors, a resin cap is made of polyamide or polyamide with glass as the resin material, and has a large number of radial grooves that fit into the yoke part of the core on both end faces of the core. A cap for insulating the core of a skew type motor, which is molded in one piece with 4 to 20% by weight of fibers and has a wall thickness of 1 mm or less.