JPH02231934A - Motor - Google Patents

Abstract

PURPOSE:To improve the accuracy by simultaneously die-casting a secondary conductor section to be arranged on a rotor coupled with a rotary shaft and a thrust stop section to be arranged on the rotor while facing with the rotary shaft, thereby eliminating post process. CONSTITUTION:A rod for forming a rotary shaft 16 is machined, through a tool (not shown), to have specific diameter and length then it is polished. A required number of magnetic steel plate 17a punched into specific shape are stack to form a rotor core 17, and the rotary shaft 16 is inserted. Then the rotary shaft 16 and the rotor core 17 are set in a die-cast mold (not shown) and die-cast material is poured therein, thus forming the secondary conductor section 18 and the thrust stop section 19 simultaneously, while at the same time the rotary shaft 16 is coupled with the rotor core 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a rotor in an electric motor.

[Conventional technology]

FIG. 5 is a sectional view showing a conventional electric motor disclosed in, for example, Japanese Unexamined Patent Publication No. 52-41805, and in the figure (1)
is a rotating shaft, {a is a rotor coupled to this rotating shaft, and a secondary conductor part (3) made of a die-cast material is formed on the outer periphery. (41 is a rotor connected to the rotor at both ends thereof This is a thrust stopper provided on the rotating shaft (1), and a groove is bored in the rotating shaft (1) and a stopper ring {(5) is fitted therein.(6) has one end in contact with this stopper ring. A collar (7) provided in contact with the rotating shaft {1}
) is a bearing provided on the rotating shaft (1) facing this collar, and (81 is a washer provided between this bearing and the collar {6}, for adjusting the thrust load).

A conventional electric motor is constructed as described above, and the thrust stopper (a) is able to withstand the thrust load caused by the rotation of the rotating shaft (1).
In particular, the washer (8) was used.

[Problem to be solved by the invention]

In the conventional electric motor as described above, a groove is provided on the rotating shaft (1) and a stopper ring (5), a collar (6), etc. are attached as a thrust stopper (4) for the rotating shaft (1).
Processes such as cutting and assembling the rotating shaft (1) require a lot of work time, and the above steps cause the rotating shaft (1) to run out and bend, resulting in poor dimensional accuracy.

This invention was made to solve the problem,
It is an object of the present invention to provide an electric motor having a rotating shaft with good dimensional accuracy and in which a thrust stopper on the rotating shaft can be easily created.

[Means to solve the problem]

The electric motor according to the present invention includes a rotating shaft, a rotor coupled to the rotating shaft by providing a secondary conductor, and a thrust stopper provided on the rotating shaft opposite to the rotor,
the rotor is wedged on the rotating shaft; the secondary conductor portion;
This simultaneously forms the thrust stopper and connects the rotor to the rotating shaft.

[Effect]

In this invention, the rotor is wedged on the rotating shaft, the secondary conductor part and the thrust stop part are formed, and the rotor and the rotating shaft are connected at the same time, so that the thrust stop part can be assembled on the secondary conductor part. Can be done at the same time as molding.

〔Example〕

FIG. 1 is a cross-sectional view of a quadrotrochanter section showing an embodiment of the present invention;
FIG. 2 is a sectional view of the electric motor, FIG. 3 is a sectional view of the rotor with the rotating shaft inserted, and FIG. 4 is a sectional view of the rotor wedged onto the rotating shaft. ) indicates the same or equivalent part as the above conventional example, and QO). <10a
) is a frame and bracket that form the outer casing of the electric motor (1l), (12) is a bearing holding part provided on this frame and bracket, and (13) is a stator installed inside the above frame 00), and a coil (14) is wound.

(15) is the frame (
The rotor part provided in the rotor part 101, (l6) is a rotating shaft constituting this rotor part, and (l7) is a rotating shaft with wedges (17b) formed at two places above and below by a caulking blade (17a). attached rotary fore, e.g. magnetic steel plate (17c)
are layered. (l8) is a secondary conductor part molded, for example, by die-casting material on this rotor, and (l9) is a thrust stop part molded integrally with this secondary conductor part, which rotates from the rotor (l7). A stop portion is formed at the tip of the stop portion with a machining gap (20) between the stop portion and the rotating shaft (16). (2l
) is a bearing provided in the bearing holding part (I2), and is made of, for example, a sintered oil-impregnated slag bearing.

In the electric motor configured as described above, the assembly is performed by processing the material for the rotating shaft (16) by a processing machine (not shown) to adjust the shaft diameter.
After processing the shaft length, shaft end, etc. into a predetermined shape, it is polished. On the other hand, a magnetic steel plate (1
7c) are stacked to a predetermined size to form a rotor (17). Then, the rotor (17) is inserted into the rotating shaft (l6), and is temporarily fixed to the rotating shaft (l6) by being wedged in two places with caulking blades (17a) at a predetermined position.
The secondary conductor part (l8) and the thrust stopper part (l9) are mounted on a die-casting mold (not shown) provided so that they can be molded together at the same time, and are molded with die-casting material into the shape shown in Fig. 1. At the same time, the rotation shaft (16) and the rotor (17) are coupled together. Further, while holding the rotating shaft (16), the thrust stopper (19) is cut to a predetermined size by a cutting machine (not shown) using the machining gap (20) without damaging the rotating shaft (16). Further, the rotating shaft (l6) is inserted through the bearing (2l) provided in the bearing holding part (l2) and the stator (13) in the frame (101), and the bracket <10a) is screwed to the frame QOI. In this way, the rotor (l7
), the thrust stopper (l9) can be formed and connected to the rotating shaft (l6) at the same time as the secondary conductor part (l8) of the ), etc., is no longer required, and the production time is reduced.
Labor costs are reduced. In addition, machining and press fitting of the rotor (l7) to the rotating shaft (16) are eliminated, and the rotating shaft (l6)
The bending and wobbling of the rotor (17) are eliminated, and the rotating shaft (16) is held and the rotor (17) is cut by cutting the outer periphery of the rotor (17).
) The vibration of the outer periphery is eliminated, and the accuracy of the rotor portion (15) is improved. Since the rotor (l7) is wedged onto the rotating shaft (l6) by the caulking blade (17a), it is no longer necessary to set the positions of the rotating shaft (l6) and rotor (l7) in the die-casting mold, and the work becomes easier. Furthermore, by cutting the thrust stop portion (19) to a predetermined size, the die-casting mold is unified, making the mold versatile, and eliminating the need for mold replacement, which shortens the working time.

〔Effect of the invention〕

As explained above, the present invention includes a rotating shaft, a rotor coupled to the rotating shaft by providing a secondary conductor, and a thrust stopper provided on the rotating shaft facing the quadrotor. By wedgely attaching the rotor to the rotation shaft, forming the secondary conductor portion, the thrust stop portion 1 to the stop portion, and connecting the rotor to the rotation shaft at the same time, the thrust stop portion is attached to the rotation shaft during post-processing. There is no need to provide a rotor as a rotor, and the bending and wobbling of the rotary shaft that occur in subsequent processes can be eliminated, and the precision of the rotary shaft and rotor can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rotor section showing an embodiment of the present invention;
Fig. 2 is a sectional view of the electric motor, Fig. 3 is a sectional view of the rotor with the rotating shaft inserted, Fig. 4 is a sectional view of the rotor wedged onto the rotating shaft, and Fig. 5 is the conventional motor. FIG. 2 is a cross-sectional view showing the rotating part of the motor. In addition, the same reference numerals in each figure indicate the same or equivalent parts.
16) is a rotating shaft, <<17>> is a rotor, (18) is a secondary conductor part, and (!9) is a thrust stop part.

Claims (1)

[Claims] A rotating shaft, a rotor coupled to the rotating shaft by providing a secondary conductor part, and a thrust stop part provided on the rotating shaft facing the rotor, the rotor is connected to the rotating shaft. An electric motor characterized in that the secondary conductor portion and the thrust stop portion are formed and the rotor and the rotating shaft are connected at the same time.