JPS60156248A - Rotor of magnet rotary type motor - Google Patents

Abstract

PURPOSE:To reduce the size of a rotor by forming the rotor by spirally winding the outer periphery of a magnet with a string made of a continuous nonmagnetic material. CONSTITUTION:A continuous nonmagnetic string-shaped material 12 is spirally wound on the outer periphery of a magnet 3 of a rotor, between the material 12, the magnet 3 and the material 12 is secured by an impregnating adhesive 13 to form a rotor. Thus, an air gap distance between the magnet 3 and the stator can be reduced to decrease the magnet 3, thereby reducing the size and weight the rotor of a magnet rotary type motor.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to a magnet-rotating inner rotor type brushless D.
This is related to the rotor of the C motor.

Structure of the conventional example and its problems First, a conventional magnet rotating electric motor will be explained with reference to FIG. Magnets 3 are arranged and fixed to a rotating shaft 1 via a yoke 2 so as to form a plurality of poles in the axial direction, and a rotor is further provided around the outer circumference of which the magnets are reinforced and a resin-impregnated glass tape 4 is wound. A stator 6 around which a winding 5 is wound is provided with a gap around the outer periphery of the rotor. Reference numerals 7 and 8 are bearings, which support the rotating shafts 1 on both sides. Further, 9 is a motor case to which bearings 7 and 8 and the stator 6 are fixed. 10 is a magnetic pole detection sensor for detecting the rotational position of the rotor, and has a control circuit 11 for generating a rotating magnetic field in the stator 6 in response to this signal. Next, problems with the conventional example will be described.

First, FIG. 2 shows a cross-sectional view of a rotor of a conventional magnet-rotating electric motor. 1 to 4 are the same members as in FIG. 1, and their explanation will be omitted. The resin-impregnated glass tape 4 is wound for the purpose of reinforcing the magnet 3 in order to protect it from centrifugal force due to rotation, and both ends are overlapped and joined.
A joint portion 4a is formed. Therefore, it is inevitable that the thickness of the joint portion 4a is twice the thickness of the resin-impregnated glass tape 4 itself. When considering the gap distance between the rotor and stator, it goes without saying that the smaller the gap, the better the efficiency. However, once the joint 4a is formed, the gap between the rotor and the stator must necessarily be larger than the thickness of the joint (twice the thickness of the resin-impregnated glass tape).

If this joint portion 4a were not present, the gap distance would be more than half of the above. That is, the air gap can be made smaller, the air gap distance between the magnet 3 and the stator becomes smaller, and the magnet can be used more effectively.

This allows the magnetic flux density in the air gap to be high, and the surface area of the magnet facing the stator to be small. As a result, reducing the size of the magnet is useful for economy and miniaturization of the motor.

In addition, when winding a resin-impregnated glass tape around the rotor, it is necessary to wrap the resin-impregnated glass tape 4 for the length of the rotor and fix the joints before thermosetting the whole.However, At this time, a heating element such as a soldering iron must be used to apply a thinning tension that will cause the soldering iron to stick.
It is very difficult to uniformly fix a wide object as a whole, resulting in poor workability and variations in the winding force around the magnet, resulting in a lack of reliability.

OBJECT OF THE INVENTION The present invention solves the above problems and provides a cheaper, smaller,
The present invention provides a lightweight rotor for a magnet rotating electric motor.

Structure of the Invention The rotor of the magnet-rotating electric motor of the present invention includes a rotor in which magnets are arranged and fixed to a rotating shaft via a yoke so as to form a plurality of poles in the circumferential direction of the shaft, and an air gap exists on the outer periphery of the rotor. A stator with windings wound around it, a magnetic pole detection sensor for the above magnet, and this sensor. K: WEL? □Wow, 2 degrees,
□1 control circuit, the outer periphery of the magnet is spirally wound with one continuous string-like body made of a non-magnetic material, and the magnet and the string-like body are fixed with resin. It was constructed as follows.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to figures 3 and 4 of the cylinder. Components with the same numbers as in FIGS. 1 and 2 indicate the same configurations, and their explanations will be omitted. In the figure, 12 is a continuous string-like body made of a non-magnetic material spirally wound around the outer periphery of the magnet 3 fixed to the yoke 2, and 13 is, for example, a thermosetting or curing agent-added resin. The string-like body 12, the magnet 3, and the string-like bodies are fixed with an impregnated adhesive such as the like.

As is clear from the figure, in the rotor of the magnet-rotating electric motor of the present invention having the above-described structure, the outer periphery of the magnet 3 is continuously wound in a spiral shape with a single string-like member 12. , a joint (FIG. 2, 4a) as in the conventional example does not occur. Therefore, the air gap distance between the magnet 3 and the stator 6 can be reduced.

In addition, in terms of strength, since the string-like body 12, the magnet 3, and the string-like bodies are fixed with the impregnated adhesive 13, they are reinforced with a piece of resin-impregnated glass tape with a wide width (corresponding to the length of the rotor). This is similar to the above, and sufficient strength can be obtained.

Furthermore, the magnet 3 is stronger than when wrapped with resin-impregnated glass tape.
It becomes easy to wrap tightly. That is, in the present invention, since the rotor magnet 3 is wound with one continuous string-like body 12, it is easy to apply a uniform tensile force to the string by fixing the ends and winding the string one after another. It can be applied to the shaped body 12, and the other end can be easily fixed while applying a tensile force. Note that the rotor both ends 14 of the string-like body 12
．． 14, by providing bar-shaped protrusions parallel to the axis 1 on both ends 14 of the yoke part, or notches, etc. on both ends 14 of the magnet 3.
It can be fixed to this or by any other suitable method. The O-shaped body 12 may also be made of resin-impregnated glass fiber, and in this case, the resin impregnated into the string-like body 12 may be semi-cured and the string-like body may have adhesive strength. With such adhesive strength, there is no need to consider the method of fixing at both ends described above. Since it has shrinkage properties when hardened, it also has the effect of further strengthening the winding force of the string-like body to the magnet.

DETAILED DESCRIPTION OF THE INVENTION The present invention involves spirally winding the outer periphery of a rotor magnet with a continuous string-like body made of a non-magnetic material, and bonding the string-like body and the magnet with an impregnated adhesive. Since the rotor is formed by fixing the string-like bodies, the gap distance between the magnet and the stator can be reduced. Therefore, it is possible to reduce the size of the magnet, and it is possible to provide an economical, small and lightweight rotor for a magnet-rotating electric motor, and it is also possible to improve productivity and reliability, which is very useful industrially.

[Brief explanation of drawings]

Figure 1 is a sectional view showing an example of a conventional magnet rotating electric motor.
Figure 2 is a cross-sectional view of the rotor of the magnet-rotating electric motor;
The figure is an external view showing one embodiment of the rotor of the magnet rotating electric motor of the present invention, and FIG. 4 is a cross-sectional view of the rotor. 1...Axis, 2...Yoke, 3...
...Magnet, 12...String-shaped body, 13...
Impregnated adhesive. Name of agent: Patent attorney Toshio Nakao and one other person Figure 1 Figure 2 Figure 3 Figure 41! l! ,9

Claims (2)

[Claims] (1) A rotor in which magnets are arranged and fixed on a rotating shaft via a yoke so as to form multiple poles in the circumferential direction of the shaft, and a suhuta located on the outer periphery of this rotor with a gap in between and around which a winding wire is wound; It has a magnetic pole detection sensor of the magnet, and a control circuit that generates a rotating magnetic field in the stator in response to a signal from the sensor, and the outer periphery of the magnet is surrounded by a continuous string-like body made of a non-magnetic material. A rotor for a magnet-rotating electric motor that is wound in a spiral pattern and fixed to a magnet, a string-like body, and the string-like bodies using an impregnated adhesive system. (2) A rotor for a magnet-rotating electric motor according to claim 1, wherein the outer periphery of the magnet is spirally wound with a continuous string-like body made of resin-impregnated glass fiber.