JP2573842B2 - Method of manufacturing motor rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing a motor rotor characterized by a core insulation treatment.

<Prior art> Conventionally, motor rotors, especially armature parts, have been manufactured by coating a known core such as an electrostatic cloud method or a flow immersion method on a core having a plurality of slots and coaxially mounted on a rotating shaft. After coating with a synthetic resin such as epoxy resin by the method, the coil wire is wound around the core teeth of the core so as to pass through the slot, the end of the coil wire is engaged with the commutator by fusing, etc., and the coil is further slotted. The slot is filled with an epoxy resin or the like so as to be held inside.

In such a manufacturing method, in the process of powder coating the core before winding the coil wire into the core teeth with a synthetic resin such as an epoxy resin, the core is heated and the resin is uniformly spread over the entire surface of the core. A method of cutting the outer peripheral surface of the core after applying the coating, and a method of masking the outer peripheral surface of the core in advance, heating the core to apply the resin coating, and then removing the mask are common.

However, in these methods, a sharp edge portion is apt to be generated at the edge of the core tooth where the coating is interrupted, and the coil wire is easily damaged during the subsequent handling of the coil winding and the like, and the epoxy resin film is used. It is conceivable that chipping occurs.

JP-B-48-5161 discloses that the outer peripheral surface of a core is masked, a resin coating is applied to a heated core, the mask is removed, the core is reheated, and a relatively thin resin coating is applied again to the surface of the core including the outer peripheral surface. There is disclosed a method of manufacturing a motor rotor that prevents the above-mentioned sharp edges of the core teeth from being applied to the whole. However, in this method, there is a problem that the resin coating by masking must be performed twice on the core, so that the number of man-hours is increased and the management items of the process are increased, so that the manufacture of the motor rotor becomes complicated.

<Problems to be Solved by the Invention> In view of the problems of the prior art as described above, a main object of the present invention is to simplify the insulating process of the core without causing chipping in the resin coating of the core. Another object of the present invention is to provide a method of manufacturing a motor rotor in which a core wound coil is not damaged.

<Means for Solving the Problems> According to the present invention, such an object is to be mounted coaxially on a rotating shaft and to pass through the slots of the core divided in the circumferential direction by a plurality of slots. A method of manufacturing a motor rotor for winding a coil around the core as described above, wherein a step of resin coating a core surface including an edge portion of the core teeth of the core, a step of winding the coil, And a step of cutting and removing the resin coated on the outer peripheral surface of the core in this order. This is achieved by providing a method for manufacturing a motor rotor.

<Operation> In this way, the resin covers the core teeth especially at the edges during winding, which prevents chipping of the resin coating on the core and damage to the coil, and increases man-hours and management items Nothing to do.

<Embodiment> Hereinafter, the accompanying drawings of a preferred embodiment of the present invention will be described in detail.

FIG. 1 shows a motor rotor to which a manufacturing method according to the present invention is applied. A sleeve 2 made of an insulating material is fitted in an intermediate portion of the rotating shaft 1, and an armature 3 and a commutator 4 are fixed on the outer periphery of the rotating shaft 1 so as to be spaced apart from each other in the axial direction and coaxial with each other. The armature 3 has a core 5 formed by laminating a number of thin plates, and the core 5 has eight core teeth 7 which are circumferentially divided by eight slots 6 extending in the axial direction. The armature 3 has a plurality of coils 8 wound around a core tooth 7 so as to pass through the slots 6.
have. The commutator 4 has eight segments 9 divided so as to be insulated from each other along the circumferential direction and a tongue 10 provided on each segment. The lead wire 11 of the coil 8 is connected to these tongues 9.

The main steps in the process of manufacturing the motor rotor shown in FIG. 1 will be described with reference to the block diagram shown in FIG.

First, the core 5 is coaxially fixed to the outer periphery of the sleeve 2 fitted on the rotating shaft 1. Then, in step 21, the epoxy resin powder is dissolved and fixed on the entire surface including the outer peripheral surface, the edge portion, and the inside of the slot 6 by a known powder coating method such as an electrostatic cloud method or a fluid immersion method. Coating. As a result, as shown in FIG. 3, the cured film 31 of the epoxy resin is applied to the entire surface of the core tooth 7 including the outer peripheral surface 7a. At this time, the sharp edge portion 7b as the edge portion of the coat 7 and the resin film on the inner surface of the slot 6 are controlled to have a required thickness, but the thickness of the outer peripheral surface 7a does not need to be specially controlled.

In step 22, the coil 8 is wound around the core tooth 7 so as to pass through the slot 6, and is engaged with the tongue 10. At this time, since the resin coating is not interrupted from the edge 7b of the core tooth 7 to the outer peripheral surface 7a and is formed relatively smoothly, the coil wire may be damaged or the edge 7b may be damaged.
No chipping occurs in the cured epoxy resin film 31.

In step 23, the entire core 11 is coated with an epoxy resin 32 so that the slot 6 is filled with resin and the coil 8 is held.

Finally, in step 24, the outer peripheral surface of the armature 3 thus formed is cut by lathing or the like to remove the epoxy resin adhered to the outer peripheral surface (FIG. 4). Here, the cutting operation of the epoxy resin film adhered to the outer peripheral surface of the core by the resin coating in the step 21 and the step 23 is performed as follows.
Since it is performed in degrees, the man-hour does not increase.

It is needless to say that the present invention is not limited to the above-described embodiment, and various applications are possible. For example, in this embodiment,
Although an epoxy resin is used for coating the core and for holding the coil, other synthetic resins may be used. Further, in this embodiment, resin coating is performed to hold the coil in step 23, but a coil stay made of a plate-shaped member may be provided.

<Effects of the Invention> As described above, according to the present invention, in the manufacture of the motor rotor, the resin coating and the coil wire on the edge of the core steeth are not damaged during winding, so that the reliability of the motor is reduced. The effect is extremely large because the number of man-hours and process control items are not increased.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a motor rotor to which a manufacturing method according to the present invention is applied. FIG. 2 is a block diagram schematically showing a method for manufacturing a motor rotor according to the present invention. 3 and 4 are cross-sectional views of the motor rotor for explaining the manufacturing method according to the present invention. DESCRIPTION OF SYMBOLS 1 ... Rotating shaft, 2 ... Sleeve 3 ... Armature, 4 ... Commutator 5 ... Core, 6 ... Slot 7 ... Core teeth, 7a ... Outer peripheral surface 7b ... Edge, 8 ... Coil 9: Segment, 10: Tongue 11: Lead wire, 21 to 24: Steps 31, 32: Epoxy resin

Claims (1)

(57) [Claims] 1. A method of manufacturing a motor rotor, wherein a coil is wound around a core coaxially mounted on a rotating shaft and passed through the slots of a core divided in a circumferential direction by a plurality of slots. A step of coating the core surface including an edge portion of the core teeth of the core with a resin; a step of winding the coil; and a step of cutting and removing the resin coated on the outer peripheral surface of the core. And in this order, the method for manufacturing a motor rotor.