JPS6028230B2 - Hysteresis motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hysteresis motor used as a drive source for watches and the like.

BACKGROUND ART A hysteresis motor has been known as one type of motor used as a drive source for watches and the like.

This hysteresis motor has a magnetic characteristic of a hysteresis ring press-fitted into its rotor, that is, a coercive force Hc.
The performance of the motor is influenced by the residual magnetism Br and the residual magnetism Br. The performance of a motor is determined primarily by its starting characteristics and synchronization characteristics, but the coercive force Hc has the most acute effect on these starting characteristics, and the coercive force Hc is small in terms of starting characteristics. However, for the synchronization characteristics, it is desirable that the coercive force Hc be larger. Furthermore, although the residual magnetism Br is not as strong as the coercive force Hc, it is related to the starting characteristics and the synchronization characteristics, and a larger one is usually desirable. Furthermore, the area of the hysteresis loop of the hysteresis ring is also required to be large. In the related field, the materials that are practically used as hysteresis rings for hysteresis motors are relatively limited, such as Fe-Mm-based, Fe-Cr-based, Fe-Ni-based, and Cr-Vicalloy-based alloys. It was used in the form of a single magnetic material. These materials are then heat treated to adjust the hysteresis loop to be as desirable as possible. This heat treatment changes the hysteresis loop as follows. In FIG. 4, a material exhibiting hysteresis loop a at a certain tempering temperature changes to exhibit hysteresis loop b when the tempering temperature is lowered,
Moreover, when the tempering temperature is made higher than that, the material changes so as to show a hysteresis loop c. Therefore, in situations where there are limited materials that can actually be used as a hysteresis ring, if the adjustment method using heat treatment as described above is used, the coercive force Hc will decrease if the residual magnetism Pr is increased, and it is difficult to increase the coercive force Hc. In this case, the actual situation is that it is difficult to make both the coercive force Hc and the residual magnetism Br desirable, such as the residual magnetic peak r being insufficient. For this reason, among the starting characteristics and synchronizing characteristics that determine motor performance, the synchronous characteristics are more important, and conventionally, the magnetic characteristics of the hysteresis ring were sacrificed to some extent to the starting characteristics. However, it was decided that synchronization characteristics were given top priority. For this reason, the conventional hysteresis mode had a disadvantage of poor starting characteristics. Therefore, an object of the present invention is to improve the starting characteristics of a hysteresis motor without impairing the synchronization characteristics.

Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, 1 is a support plate, and a stator 2 is disposed on this support slope.

This stator 2 includes an iron core 3 fixed perpendicularly to a support plate 1;
It consists of a stator plate 4, a corner ring 5, and an excitation coil 7 wound around a bobbin 6. The stator plate 4 is formed by bending stator magnetic poles 4a around the outer periphery of the coil 7. A rotor shaft 8 rotatably passes through the center of the iron core 3.

A bowl-shaped member 9 is made of a non-magnetic material, rotates together with the rotor shaft 8, and covers the stator 2.

10 is a pinion provided on the lower shaft 8, and the rotation of this pinion is controlled by a deceleration gear (not shown) disposed between the support plates 1 and 11.

) is transmitted to the gear 12 and output pinion 13.
By the way, the hysteresis motor according to the present invention is characterized by a hysteresis ring 14 attached to a portion of the non-magnetic member 9 facing the stator magnetic pole 4a.

That is, this hysteresis ring 14 is made of two hysteresis materials 143"1 having different magnetic properties as shown in the second diagram.
4b joined to each other in a laminated state and molded into a ring shape. Therefore, the hysteresis material and manufacturing method used for the hysteresis ring 14 will be explained.

Hysteresis materials include Fe-Mn alloy, Cr-V
Icalloy type alloys, Fe-Ni type alloys, and alloys of the same type with different compositions are used in appropriate combinations. Then, by hot or cold rolling, two adhesive layers are formed as shown in the second figure. After that, the temperature is 550 to 60℃ in a salt grade, vacuum, or inert gas atmosphere.
Temper by holding at 00q C for 1 to 3 hours. The following table summarizes the measured values obtained by changing the hysteresis material and heat treatment conditions. FIG. 3 is a magnetic characteristic diagram of the hysteresis ring 14 of this example, and in this figure, curve A is the hysteresis curve of the hysteresis ring 14 obtained in Example 1 in the above table.

Curve B is the hysteresis curve of the hysteresis material 14b consisting of 5% by weight of Mn, 4% by weight of Cu, and the remainder Fe, and curve C is the hysteresis curve of the hysteresis material 14b consisting of 5% by weight of Mn, 4% by weight of Cu, and the remainder of F.
It is a hysteresis curve of a single hysteresis material 14a made of e. In other words, curve A is the hysteresis material 14a, 14b having different magnetic properties from curve B and curve C.
The concavity of curve A appears because the coercive force Hc of the two is discontinuous at the joint surface. As can be seen from FIG. 3, the hysteresis material 14b with the magnetic properties of curve B has a small coercive force Hc, and the hysteresis material 14b with the magnetic properties of curve C has a small coercive force Hc.
a has a large coercive force Hc. Curve A has a concavity in the second and fourth quadrants of FIG. is being increased. This makes it possible to improve the start-up characteristics without substantially impairing the synchronization characteristics. As shown in the table above, the starting torque and synchronizing torque of the hysteresis motor according to the present invention are as shown in the table above.
60 oersted, residual magnetism Br about 5000-600
0 Gauss), the starting torque is approximately 0.3 g-Cm, and the synchronizing torque is approximately 2. Compared to thigh-Cm, the starting torque has improved about 4 to 5 times.

Also, the synchronous torque is slightly lower than the conventional one,
This is a value that poses no problem in use. In the above example, the two sheets of hysteresis material were joined in a layered manner by rolling, but the invention is not limited to this.
Bonding may also be performed using a predetermined heat-treated adhesive or the like.

As described above, in the present invention, by using a hysteresis ring in which at least two layers of hysteresis materials having different magnetic properties are laminated, the starting characteristics can be significantly improved without impairing the synchronization characteristics.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted longitudinal sectional view of a hysteresis motor according to an embodiment of the present invention, Fig. 2 is an enlarged longitudinal sectional view of a hysteresis ring, Fig. 3 is its magnetic characteristic diagram, and Fig. 4 is a conventional hysteresis motor. It is a magnetic characteristic diagram of a ring. 4a...Stator magnetic pole, 9...Nonmagnetic member, 14...Hysteresis ring, 14a, 14b...Hysteresis material. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A rotor that is rotationally driven in cooperation with stator magnetic poles is composed of a non-magnetic member and a hysteresis ring attached to a surface of the non-magnetic member facing the stator magnetic pole, and the hysteresis ring has different hysteresis loops. Two hysteresis materials are laminated in two layers, and one hysteresis material has a coercive force higher than that of the other hysteresis material and a remanence smaller than that of the other hysteresis material. A hysteresis motor comprising: