JPS5886840A - Fixing method for coil of rotor or stator of rotary electric machine - Google Patents

Abstract

PURPOSE:To omit a troublesome finishing process by attaching powdered epoxy resin to the rotor or the stator, the coil thereof is conducted and heated, blowing off the epoxy resin of sections except the coil and melting and curing the epoxy resin. CONSTITUTION:The coil of the stator S is conducted and heated so that the coil reaches approximately 80 deg.C and other sections 25-30 deg.C, the stator S is entered into a vessel 9 in which the powdered epoxy resin 11 is placed onto a filter 10, and air is blown in from a lower port 9a, thus attaching the powdered epoxy resin 11 to the whole stator S. Here, the powdered epoxy resin adhering on the coil of the stator S is brought to a state that solidly adheres because of the high temperature of the coil, but other sections are brought to states that powder simply adheres. Powdered epoxy resin adhering on sections except the coil is blown off by means of air spray-up devices 13, 14 while the stator S is turned by means of a revolution supporter 12, and lastly the epoxy resin adhering on the coil is melted and cured. The same applies to the rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fixing a rotor or stator coil of a rotating electric machine.

The rotor or stator coil of a rotating electric machine made of enamelled wire has low mechanical strength, so it is reinforced by, for example, impregnating the space between each wire with epoxy resin and curing it.

However, with this method, the epoxy resin is also adhered to and hardened on the inner periphery of the rotor core (this is true in the case of I4 machines with an internal rotation history, and on the outer periphery in the case of external rotation types). This has the disadvantage that it requires a process to remove it by cutting or polishing, which requires unnecessary labor. The same applies to the stator.

In view of this point, the present invention has developed an 80cc coil by electrically heating a coil.
When the rotor or stator is moved back and forth, the rotor or stator is placed in a powder layer of epoxy resin, and the epoxy resin adheres to it to form a gel or a state close to it. The epoxy resin is blown away by an air stream, and then the rotor or stator is heated in a heating furnace to harden the epoxy resin.

An example of implementing the present invention will be described below with reference to the drawings. Figure 1 shows a stator 8, in which 1 is a yoke, 2 is an iron core, and 3 is a coil made of several enamelled wires bundled and wound around the iron core 2 (for example, 7 wires with a diameter of 0.6 mm). ), 4 is a holder for holding the leader line, 3a, 3
a' is a brush, and 3b is a terminal.

FIG. 2 shows a rotor R', in which 5 is a shaft, 6 is a nine-layer core fixed to the shaft 5, 7 is a coil, and 8 is a commutator.

Next, an example of the fixing method of the present invention will be explained with reference to FIGS. 3 to 5.

(First step) Figure 3 shows the case of a stator, and the brush 31.3 is energized by 3a.
, 3a' and 3b. For example, in 5 seconds for 300 people, coil 3 becomes 80 cc, but other parts are at 25 to 30°C.

Figure 3 (c), (Q is for rotor R and commutator 8
The electrode P is brought into contact with the coil, and the coil is electrically heated while being rotated at a rotation rate of 15 times per minute. K to obtain a uniform temperature rise
It is preferable to arrange the electrodes P as shown in FIG. In this case, for example, the coil reaches 80 cCK at 300 A for 20 seconds, and the temperature of the laminated core is 35 to 40°C.

The above-mentioned 80 oc is a temperature suitable for the next epoxy resin adhesion and spraying, since the temperature rise in other parts is small if the coil is at this level.

(Second step) As shown in FIG. 4, the powdered epoxy resin 11 is placed on the filter 10 built in the container 9, and air is introduced through the opening 9a at the bottom to form the powdered epoxy resin 11 into a powder layer. Place about 10 pieces of stator S or rotor R in this. In this step, the powdered epoxy resin adheres to the entire stator or rotor, but the temperature of the coil portion is around 80 cc, so the powder is firmly stuck and not completely dissolved. Other parts are simply covered in powder. Note that the second step may be performed simultaneously with the first step.

(Third Step) As shown in FIG. 5, while the stator S is rotated by the rotating support 12, the epoxy resin powder adhering to the inner and outer peripheries is blown off by air blowing devices 13 and 14. In this case, the air pressure may be weak.

As shown in FIG. 5(c), the rotor R is supported on the pedestal 15 and rotated, while air is similarly blown using the air blower sealer [16] to blow off the epoxy resin powder.

(Fourth step) Next, in a heating furnace (not shown), the
Heat at cC for about 30 minutes to melt and harden the epoxy resin attached to the coil.

According to the present invention, by adding the step of energizing and heating the coil, there is a practical advantage that the troublesome finishing steps such as cutting and polishing in the conventional method can be omitted.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a cutaway front view of the stator, FIG. 2 is a front view of the rotor, and FIG. 3 (6).
, (c), 0 is an explanatory diagram of the first step, FIG. 4 is an explanatory diagram of the second step, and FIG. 5 (c) is an explanatory diagram of the third step. The symbols in the drawings indicate the following members, respectively. S: Stator R: Rotor E: Power supply P: Electrode 1: Yoke 2: Core 3: Coil 4: Holder 5 = Shaft 6: Laminated core 7: Coil 8:
Commutator 9: Container 10: Builta 11: Epoxy resin 12: Rotation support 1
3: Air blowing device 14: Air blowing device 15
: cradle 16 : Air blowing device patent applicant Mitsuba 1 Machinery Co., Ltd. Fig. 1 2M Fig. 2 Fig. 3

Claims (1)

[Claims] 1. A first step in which the coils of the rotor or stator are energized and heated, and then a second step in which the rotor or stator is placed in a powdered SO epoxy resin and the epoxy resin is attached. Yang and
Next, remove the powdered epoxy resin from the parts other than the coil by air)
Rotation of a rotating electric machine characterized by combining a third step of blowing away and a fourth step of heating the cape or stator and melting and hardening the epoxy resin attached to the coil portion. How to fix child or stator coils. 2. Method 3 for fixing a rotor or stator coil of a rotating electric machine according to claim 1, characterized in that the first step and the second step are performed simultaneously. A method for fixing a rotor or stator coil of a machine according to claim 1 or 2, characterized in that the temperature of the coil heated by electricity in the step is 80±5oc.