JP3285060B2 - Rotor of high-speed motor and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for a high-speed motor such as a servomotor used in a state where high-speed rotation or forward / reverse rotation is intense, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, in a rotor of a high-speed motor that rotates at a rotation speed of 6000 rpm or more, it is necessary to prevent a magnet provided on the rotor from being scattered or damaged by centrifugal force during high-speed rotation. Therefore, for example, FIG.
As shown in the figure, the ring-shaped integral magnet 1 or the magnet 1 obtained by equally dividing the ring-shaped magnet in the circumferential direction is positioned by the stepped portion 21 of the motor shaft 2 and adhered to the outer peripheral surface of the motor shaft 2. Further, a protection ring 3 made of a non-magnetic material is fitted in a state in which an adhesive is applied to the outer periphery of the magnet 1, and the space between the magnet 1 and the protection ring 3 is fixed by bonding. Further, instead of covering the outer circumference of the magnet 1 with the protective ring 3, a glass yarn is wound, and the glass yarn is impregnated with a resin and cured to process the outer diameter of the glass yarn.

[0003]

However, in the prior art in which the protective ring is put on the outer periphery of the magnet, the protective ring needs to be thinly machined in order to keep the gap between the rotor and the stator small, which requires much labor. In addition, the magnet and the motor shaft are bonded twice and the protective ring and the magnet are bonded twice, so that it takes a long time to cure the adhesive, and much time is required for the bonding process. Also, in the method of winding a glass yarn around the outer periphery of a magnet and curing with a resin, it takes a long time to cure the resin, and it is necessary to perform outer diameter processing to remove a cause of vibration, which increases a manufacturing period. There were drawbacks. SUMMARY OF THE INVENTION An object of the present invention is to provide a rotor for a high-speed motor and a method for manufacturing the same, which can reduce the number of bonding steps and the working time.

[0004]

In order to solve the above-mentioned problems, the present invention provides a rotor shaft having a stepped portion for positioning a magnet, and a ring fixed to the outer periphery of the rotor shaft by contacting the stepped portion. And axially connected
In a rotor of a high-speed motor provided with a continuous magnet and a protection ring made of a non-magnetic material fitted to the outer periphery of the magnet, a side having substantially the same height as the thickness of the magnet and not contacting the magnet. A stepped portion having an inclined surface is provided on the rotor shaft ,
On one end face side, a slope corresponding to the slope of the stepped part is provided.
Protection ring, adhesion of without using an adhesive and cover the outer peripheral surface of the inclined surface of the stepped portion magnet having
It is intended to be. Further, in a method for manufacturing a rotor of a high-speed motor comprising a ring-shaped magnet fixed to the outer periphery of the rotor shaft by contacting the stepped portion and a protection ring made of a non-magnetic material fitted to the outer periphery of the magnet, A stepped portion having substantially the same height as the thickness of the magnet on the rotor shaft and having an inclined surface on a side not in contact with the magnet is formed, and an opening at one end of the protection ring is formed with the stepped portion. The magnet is fixed to the rotor shaft with the magnet in contact with the stepped portion, and the protection ring is fixed to the stepped portion. And, after covering the outer periphery of the magnet, the outer periphery of the protection ring is drawn with a die and the protection ring is brought into close contact with the magnet. It is a method of manufacture.

[0005]

According to the above-mentioned means, the protective ring is brought into close contact with the outer periphery of the magnet by mechanical drawing, so that it is not necessary to fix the magnet and the protective ring by bonding, and a long working time required for bonding is not required. . In addition, since there is no gap between the magnet and the protection ring for the adhesive or the like to enter, the occurrence of vibration due to imbalance can be suppressed.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a side sectional view showing a rotor formed according to an embodiment of the present invention, FIG. 2 is a side sectional view of a material of a protection ring, and FIGS. 3 and 4 are side sectional views showing manufacturing steps. In the figure, when the magnet 1 is fixed to the rotor shaft 2,
First, a stepped portion 21 for determining a mounting position of the magnet 1 is provided on the rotor shaft 2. The height H of the stepped portion 21 is formed so as to be substantially the same as the thickness T of the magnet 1, and the end surface 21 a of the stepped portion 21 on the side contacting the magnet 1 is formed perpendicular to the rotor shaft 2. An inclined surface 21b that is inclined from the outer periphery of the stepped portion 21 is provided on the side of the stepped portion 21 that does not contact the magnet 1. The inner diameter of the protection ring 3 made of a non-magnetic material is slightly larger than the outer diameter of the magnet 1, and one end face of the thin ring shown in FIG. 2A is used as shown in FIG. Side, the inside diameter of one opening 31 is made smaller than the outside diameter of the other opening 32 and the stepped portion 21, and the inclined portion 33 is formed.
To form The inside of the inclined portion 33 is the inclined surface 2 of the stepped portion 21.
1b. Next, an adhesive is applied to the outer circumference of the rotor shaft 2 or the inner circumference of the magnet 1, and the magnet 1 is closely attached to the stepped portion 21 and fitted to the outer circumference of the rotor shaft 2, and the magnet 1 is bonded to the rotor shaft 2. I do. It is apparent that the magnet 1 can be adhered to the outer periphery of the rotor shaft 2 similarly, whether it is an integral magnet or a magnet divided in the circumferential direction. In this state, FIG.
As shown in (1), the protection ring 3 is put over the opening 32 to cover the outer periphery of the magnet 1 together with the stepped portion 21 of the rotor shaft 2. Next, a die 4 having an inner diameter that is about twice as large as the thickness t of the protection ring 3 than the outer diameter of the magnet 1.
Is prepared and pressed into the die 4 in the direction of the arrow by a press machine or the like in a state where the rotor shaft 2 to which the magnet 1 is fixed is inserted into the protective ring 3. As a result, as shown in FIGS. 4 and 5, the outer circumference of the protection ring 3 is drawn (ironed) to plastically deform the protection ring 3, and as shown in FIG.
As shown in the figure, the protection ring 3 is brought into close contact with the outer periphery of the magnet 1.

[0007]

As described above, according to the present invention, the protective ring over the outer periphery of the magnet is wrung by a die, and the protective ring is brought into close contact with the outer periphery of the magnet. The process can be omitted, and the production period can be greatly reduced. In addition, since there is no gap between the magnet and the protective ring for an adhesive or the like to enter, it is possible to suppress the occurrence of vibration due to imbalance, to provide a method for manufacturing a high-speed motor rotor with low cost and stable quality. effective.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a rotor according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a protective ring material according to an embodiment of the present invention.

FIG. 3 is a side sectional view showing a state in the middle of a manufacturing process according to the embodiment of the present invention.

FIG. 4 is a side sectional view showing a state in the middle of a manufacturing process according to the embodiment of the present invention.

FIG. 5 is a plan sectional view taken along the line AA of FIG. 4;

FIG. 6 is a side sectional view showing a conventional rotor.

[Explanation of symbols]

1 magnet, 2 rotor shaft, 21 stepped part,
21b inclined surface, 3 protection ring, 31, 32 opening,
33 ramp, 4 dice,

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 1/27 H02K 15/03

Claims (2)

(57) [Claims] 1. A rotor shaft having a stepped portion for positioning a magnet , and a ring-shaped and axially connected to the outer periphery of the rotor shaft in contact with the stepped portion and fixed.
A rotor of a high-speed motor including a continuous magnet and a protection ring made of a non-magnetic material fitted to the outer periphery of the magnet, the rotor having a height substantially equal to the thickness of the magnet and not contacting the magnet. before the stepped portion having an inclined surface on
On the rotor shaft and with one end face
Protective ring having a slope corresponding to the slope of the step
On the inclined surface of the stepped portion and the outer peripheral surface of the magnet .
A rotor for a high-speed motor, wherein the rotor is brought into close contact without using an adhesive . 2. Manufacture of a rotor for a high-speed motor including a ring-shaped magnet fixed to the outer periphery of a rotor shaft in contact with a stepped portion and a protection ring made of a nonmagnetic material fitted to the outer periphery of the magnet. In the method, a stepped portion having substantially the same height as the thickness of the magnet on the rotor shaft and having an inclined surface on a side not in contact with the magnet is formed, and an opening at one end side of the protection ring is formed. While making the outer diameter of the stepped portion smaller, an inclined portion following the opening is formed, and the magnet is fixed to the rotor shaft in a state of being in contact with the stepped portion by bonding, and the protective ring is fixed to the rotor shaft. After covering the stepped portion and the outer periphery of the magnet, the outer periphery of the protection ring is drawn with a die to bring the protection ring into close contact with the magnet. Method for producing a high-speed motor rotor to.