JP3758589B2 - Rotor structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotor structure, and more particularly to a novel structure for holding a segment magnet in an arc shape by a claw portion formed between each arc portion on the outer periphery of the rotor portion and preventing the segment magnet from falling off due to corrosive gas or the like. Regarding improvement.
[0002]
[Prior art]
Conventionally, the structure shown in FIGS. 3 and 4 has been employed as this type of rotor structure.
That is, each arc portion 4 formed on the outer peripheral portion 3 of the rotor portion 2 held by the rotating shaft 1 is provided with a segment magnet 5 having an arc shape in a ring shape via the adhesive 6.
A glass yarn 7 is formed on the outer periphery of each segment magnet 5 to prevent the segment magnet 5 from falling off.
[0003]
[Problems to be solved by the invention]
Since the conventional rotor structure is configured as described above, the following problems exist.
That is, a motor using this type of rotor is used as, for example, a canned motor such as a vacuum pump, but the atmosphere in which this motor is used is hydrogen, fluorine, other processed materials, etc. Further, the glass yarn may be corroded by contact with these gases and the like, and the segment magnet may be peeled off from the rotor portion, which has been a fatal defect as a motor.
[0004]
The present invention has been made in order to solve the above-described problems, and in particular, a rotor in which an arc-shaped segment magnet is prevented from falling off by a claw portion formed between arc portions on the outer periphery of the rotor portion. The purpose is to provide a structure.
[0005]
[Means for Solving the Problems]
The rotor structure according to the present invention has a claw portion between a plurality of arc portions formed on the outer peripheral portion of the rotor portion in order to fix a plurality of segment magnets on the outer periphery of the rotor portion provided on the rotating shaft, In the rotor structure in which the arc-shaped segment magnets are mounted on the arc portions between the claw portions , the claw portions have a Y-shape with a V-groove in a cross-sectional shape, and are connected to both ends thereof. Each segment magnet is locked on both sides by each locking piece, and the radius of the arc of the arc portion and the arc of the inner surface of each segment magnet is smaller than the overall radius of the rotor portion. This is the configuration.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a rotor structure according to the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
In FIG. 1, reference numeral 1 denotes a rotating shaft having a rotor portion 2, and each arc portion 4 formed on the outer peripheral portion 3 of the rotor portion 2 is provided with a segment magnet 5 having an arc shape and an adhesive 6. It is arranged in a ring shape through (the adhesive 6 may not be used in some cases). The radius of the arc of each arc portion 4 and the arc of the inner surface of each segment magnet 5 is configured to be smaller than the radius of the entire rotor portion 2.
[0007]
A claw portion 10 is formed between the plurality of arc portions 4 at a predetermined angular interval on the outer peripheral portion 3 of the rotor portion 2, and each claw portion 10 has a Y-shaped cross section having a V groove 10 </ b> A. consists of a shape forming a shape, the claw portion 10 has a locking piece 10a on both sides thereof.
[0008]
Both sides of the segment magnet 5 mounted on the outer peripheral portion 3 via the adhesive 6 are locked to the locking piece 10a, and when the rotor portion 2 rotates at high speed, the adhesive 6 is temporarily placed in the external atmosphere. Even when corroded by gas or the like, it is possible to prevent the claw portions 10 from being separated from the rotor portion 2 by the locking action.
[0009]
【The invention's effect】
Since the rotor structure according to the present invention is configured as described above, the following effects can be obtained.
That is, since each segment magnet in an arc shape is locked by each locking piece of the claw portion formed between each arc portion of the outer peripheral portion of the rotor portion, each segment magnet can be detached even at high speed rotation. Further, it is not necessary to form a glass yarn or the like that has been conventionally used.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a rotor structure according to the present invention.
FIG. 2 is an enlarged view showing a main part of FIG. 1;
FIG. 3 is a cross-sectional view showing a conventional rotor structure.
4 is a cross-sectional view showing a state in which a glass yarn is wound around the outer periphery of the rotor structure of FIG. 3;
[Explanation of symbols]
1 Rotating shaft 2 Rotor part 3 Outer part
4 Arc part 5 Segment magnet 6 Adhesive 10 Claw part
10a locking piece
10A V groove

Claims (1)

A plurality of arc portions formed on the outer peripheral portion (3) of the rotor portion (2) in order to fix the plurality of segment magnets (5) to the outer periphery of the rotor portion (2) provided on the rotating shaft (1) (4) has a pawl portion (10) between, in a rotor structure attached to arcuate the segment magnets (5) the on each arc portion (4) between the respective claw portions (10),
The claw portion (10) has a Y-shape with a V- shaped groove (10A) in cross-sectional shape, and has locking pieces (10a) at both ends thereof , and both sides of each segment magnet (5) are the locked by each locking piece (10a), the arc and the arc of the radius of the inner surface of each segment magnet (5) of the arc portion (4) is a smaller than the entire radius of the rotor part (2) A rotor structure characterized by that.

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