JPH0591684A - Hysteresis motor - Google Patents

Abstract

PURPOSE:To constitute a hysteresis motor of permanent magnets having various characteristics. CONSTITUTION:A rotor core 11 is split into a neutral part 11a and a pole part 11b and a permanent magnet 14 is incorporated between them. Opposing area of the neutral part 11a and the pole part 11b is selected optimally according to the characteristics of the permanent magnet 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hysteresis motor which can use a large number of types of permanent magnets to obtain a large output.

[0002]

2. Description of the Related Art Hysteresis motors are motors that start by themselves and are capable of synchronous rotation. A cylindrical semi-hard magnetic material (a permanent magnet having a relatively small holding force H _C ) is generally used for the rotor of the hysteresis motor.

FIG. 4 shows an example of a conventional hysteresis motor, in which a coil 2 is arranged on an armature 1 and a rotor 3 is arranged.
Has a structure in which a rotor core 5 in which ferromagnetic materials such as iron plates are laminated is attached to the shaft 4, and a permanent magnet 6 is arranged on the surface of the rotor core 5.

As shown by extracting the permanent magnet 6 of the rotor in FIG. 5, the magnetic flux density B is determined by the surface area of the permanent magnet 6.
The strength H of the magnetic field is determined by the thickness of the permanent magnet 6.

[0005]

Recently, the development of permanent magnets has been brisk, and various types of permanent magnets with good performance have been commercialized one after another. That is, various permanent magnets having different characteristics have been developed as shown by the BH characteristics in FIG.

However, in the conventional hysteresis motor, since the permanent magnet 6 is cylindrical, only a magnet having specific properties can be used to obtain the magnetic flux density B and the magnetic field strength H required for the motor. It was Therefore, even if there is a permanent magnet with good performance, it was not possible to construct a hysteresis motor using this.

The present invention has been made in view of the above prior art, and an object of the present invention is to provide a hysteresis motor which can employ a permanent magnet having good performance and can obtain a high output.

[0008]

The structure of the present invention for solving the above problems is a hysteresis motor in which a rotor is formed by combining a rotor core and a permanent magnet, and the rotor core is provided with a neutral portion fixed to a shaft. It is characterized in that it is divided into a plurality of pole portions arranged on the outer peripheral side of the neutral portion and arranged in the circumferential direction, and a permanent magnet is arranged between the neutral portion and the pole portion.

[0009]

The magnetic flux density on the surface of the permanent magnet can be adjusted by adjusting the area where the neutral portion and the pole portion, which divide the rotor core, face each other. Therefore, even if a permanent magnet having various characteristics is used, the above area can be adjusted to obtain an optimum magnetic flux density, and a hysteresis motor can be configured.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows a rotor 10 of a hysteresis motor according to an embodiment of the present invention. The rotor core 11 of the rotor 10 is formed by stacking iron plates, and is divided into a neutral portion 11a and a plurality of pole portions 11b. The neutral part 11a is
It is fixed to the shaft 12 and has a star-shaped cross section, in other words, a spur gear shape. Multiple poles 11b
Are arranged side by side in the circumferential direction on the outer peripheral side of the neutral portion 11a, and have a shape that just fits into the concave portion of the outer peripheral surface of the neutral portion 11a. A gap 13 is formed between the pole portions 11b. Further, the neutral portion 11a and the pole portion 1
The permanent magnet 14 is built in between 1b. The optimum number of poles 11b is adopted according to the number of poles of the armature.

The area where the neutral portion 11a and the pole portion 11b face each other, that is, the area where the permanent magnet 14 is incorporated, depends on the performance of the adopted permanent magnet 14 and the characteristics required for the motor.
The optimum one can be adopted. For example, neutral part 1
The area can be changed by changing the protrusion amount of 1a.

Further, as shown in FIG. 2, if the number of poles is the same and the number of protrusions of the neutral portion 11a is increased, the above area is increased. By changing the area in which the permanent magnet 14 is incorporated in this way, the magnetic flux density on the magnet surface can be adjusted even with the same magnet.

Therefore, even if a permanent magnet, which has not been used in the past, is adopted, an optimum magnetic flux density can be obtained by operating the hysteresis motor by designing to optimize the above area. At this time, by using the strong permanent magnet 14, the output of the hysteresis motor can be tripled from the conventional one.

The number of slits and the number of magnets may be any combination, and as shown in FIG.
Six permanent magnets 14 may be provided between 3 and 13.

[0015]

As described above in detail with reference to the embodiments, according to the present invention, the rotor core is divided into the neutral portion and the pole portion, and the permanent magnet is incorporated between the neutral portion and the pole portion. Thus, the area in which the permanent magnet is incorporated can be designed according to the performance of the permanent magnet, so that the permanent magnet having various characteristics can be used.

Since various kinds of permanent magnets can be used as described above, a hysteresis motor having a large output can be obtained by adopting a strong permanent magnet.

Further, the opposing shapes of the neutral portion and the pole portion are
Since the most efficient shape can be obtained depending on the magnet, the magnet's ability (energy product) can be fully utilized.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an embodiment of the present invention.

FIG. 3 is a configuration diagram showing another embodiment of the present invention.

FIG. 4 is a configuration diagram showing a conventional hysteresis motor.

FIG. 5 is a perspective view showing a conventional permanent magnet.

FIG. 6 is a characteristic diagram showing hysteresis characteristics of various magnets.

[Explanation of symbols]

 10 rotor 11 rotor core 11a neutral part 11b pole part 12 shaft 13 slit part 14 permanent magnet

Claims (1)

[Claims] 1. A hysteresis motor in which a rotor is constructed by combining a rotor core and a permanent magnet, wherein the rotor core is arranged in a neutral portion fixed to a shaft, and is arranged on an outer peripheral side of the neutral portion, and arranged in a circumferential direction. A hysteresis motor characterized in that it is divided into a plurality of pole parts and a permanent magnet is arranged between the neutral part and the pole parts.