JPS5814145B2 - Motor manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a motor, and an object thereof is to provide a method for manufacturing a motor that does not require adjustment and has little variation in characteristics.

FIG. 3 shows a Lave type step motor used as a conventional watch motor, and this conventional example has stators 2 and 3.
At least one of the semicircular notch holes 4a, 4b is eccentrically formed with respect to the other, and both the notch holes 4a, 4b are bored at opposite ends of the
The rotor 1 was rotatably arranged in a space 4 formed by the rotor 1, and a reversal pulse was applied to the excitation coil 5 to drive it.

At this time, the stators 2 and 3 are made eccentric with respect to the center of the rotor 1 to create a magnetic imbalance, thereby obtaining starting torque and determining the rotation direction.

Now, in such a conventional example, since the stators 2 and 3 are arranged eccentrically with respect to the outer shape of the rotor 1, when no current is flowing, the stators 2 and 3 are located at α° from the axis A-A' shown in the figure.
It comes to rest in an inclined position (static stability point).

In this state, when a current is applied to excite the stator 2 to the north pole and the stator 3 to the south pole, the motor will come to rest at a dynamic stable point tilted by (β - α) degrees from static stability.

In reality, the stator 2 is excited to the south pole and the stator 3 is excited to the north pole, and the repulsion between the stators 2, 3 and the rotor 1 is used to start the motor.

In the figure, 10 is a fixing pin, and 11 is a fixing screw.

FIG. 4 shows a curve of lot torque (holding force with the stators 2 and 3 when no current is flowing).

(It goes without saying that the same applies to 2-pole, 6-pole, or multi-pole).

Now, as shown in FIG. 4, the curve depicts a nearly sinusoidal wave, where the positive torque is the torque that acts on the rotor 1 in the positive rotation direction, and the negative torque is the torque that prevents the rotor 1 from rotating. In fact, if a current that can jump over the lock torque peak point P in the figure is applied, it will attenuate and stop around the dynamic stability point.

FIG. 5 shows the gap lock torque characteristics. As the gap between the opposite ends of the stators 2 and 3 becomes wider, the lock torque becomes smaller, and as the gap becomes narrower, the lock torque becomes larger, showing a mutually proportional relationship.

It is clear that the gap greatly affects the locking torque in this way.

FIG. 6 shows the gap-starting voltage characteristic; the wider the gap, the lower the starting voltage, and the narrower the gap, the higher the starting voltage.

In this conventional example, there is a problem in that the gap between the rotor 1 and the stators 2 and 3 greatly influences the motor characteristics.

In order to improve this drawback, a one-piece stator has been devised, but in order to increase the effective magnetic flux acting on the rotor, the width of the part of the two-piece stator that corresponds to the air gap must be made considerably smaller. There was a drawback that it was not possible.

Further, this width is about 0.05 to 0.1, which is a dimension that is difficult to process, and there is a drawback that variations in the dimension greatly affect the motor characteristics.

The present invention has been provided in view of the above-mentioned drawbacks, and will be described below with reference to one embodiment.

FIG. 2 shows the members of the stators 2 and 3 of one embodiment, in which a non-magnetic material 6 such as brass is arranged in the center, and electromagnetic iron plates, silicon steel plates, permalloy, etc. are placed on both sides of the non-magnetic material 6. It is formed by arranging soft magnetic bodies 7 and 8 and joining these non-magnetic bodies 6 and soft magnetic bodies 7 and 8 to each other by crimping or the like, and this member is shown in FIG. A non-magnetic material 6 is placed in the center and pressed to form the stators 2 and 3 as well as a cavity 4 consisting of a combination of semicircles that are eccentric to each other.

At this time, the width of the non-magnetic material 6 is set to a width corresponding to the air gap between the stators 2 and 3, and the radius of the non-magnetic material 6 is configured to such an extent that there is no problem in terms of the motor characteristics and the strength of the parts.

An iron plate 9 is inserted through the coil 5, and both ends of the iron plate 9 are fixed to both ends of the stators 2 and 3 by screws, spot welding, etc., thereby forming a motor block.

12 is a positioning pin hole, and 13 is a fixing screw hole.

As described above, the present invention involves integrally joining the stators to both sides of a non-magnetic material having a predetermined width corresponding to the air gap between the stators, and then rotatably disposing the rotor approximately in the center of this joint. Since it has a hollow space, it is possible to form a gap with a non-magnetic material instead of the air gap between the stators of a so-called Label type step motor. Since the width of the magnetic material can be set, it is possible to accurately obtain the gap spacing according to the desired characteristics, which prevents variations in motor characteristics due to variations in stator dimensions, and improves the relative relationship between stator and rotor. Once the positional relationship is determined, variations in motor characteristics are eliminated, and uniform characteristics can be easily obtained without adjustment by integrally joining the stator to both sides of the non-magnetic material.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted front view of one embodiment of the present invention, and FIG.
The figure is an enlarged perspective view of the stator member same as above, Fig. 3 is a front view of the conventional example, and Figs. However, 6 is a non-magnetic material.

Claims (1)

[Claims] 1. Stators are integrally joined to both sides of a non-magnetic material having a predetermined width corresponding to the air gap between the stators, and then a space is bored approximately in the center of this joint in which the rotor is rotatably placed. A method of manufacturing a motor consisting of