JPH025674Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rotor for a stepping motor, and particularly to a rotor for a stepping motor having a stator with pole teeth.

[Background of the idea]

In a conventional stepping motor, as shown in FIGS. 1a and 1b, a plurality of magnetic poles 1-1 to 1-8 are installed radially in a stator core 1, and a plurality of magnetic poles 1-1 to 1-8 are installed at the tip of each of the magnetic poles. is provided with pole teeth 1-10, and stator windings 2-1 to 2-8 are wound around each magnetic pole.

Further, pole teeth 6-10 are arranged on the outer periphery of the rotor 6, and the pole teeth 6-10 and the pole teeth 1-10 of the stator are arranged opposite to each other with a gap in between, and the rotor shaft 5 is arranged at the end. It is rotatably supported by a bearing 4 provided on a bracket 3.

Fig. 2 is a developed view explaining the operation of the stepping motor shown in Figs. The pole teeth 1-10 of the stator poles are provided with the same pitch as the rotor pole teeth 6-10, and for each different pole group, in this example pole 1 for poles 1-1 and 1-2. The positions of the -3 and 1-4 pole teeth are shifted by 1/4 pitch,
In Fig. 2, each equal group of magnetic poles, that is, magnetic pole 1-
Windings 2-1 and 2- wound around windings 1 and 1-2, respectively
2 are energized at the same time, and windings 2-3 and 2-4 wound around magnetic poles 1-3 and 1-4, respectively, are energized at the same time.

FIG. 2 shows that the windings 2-1 and 2-2 are energized so that the pole teeth 1-10 of the magnetic poles 1-1 and 1-2 and the pole teeth 6-10 of the rotor are aligned, and the windings 2-1 and 2-2 are energized. 3 and 2-4 are not energized, and the pole teeth 1-10 of magnetic poles 1-3 and 1-4 and the pole teeth 6-10 of the rotor are in a stationary state facing each other at positions shifted by 1/4 pitch. It shows.

Next, to move the rotor 6 in the right direction,
The windings 2-1 and 2-2 are de-energized, and the windings 2-3 and 2-4 are energized. As a result, magnetic poles 1-3 and 1-4
The pole teeth of the rotor facing the pole teeth of the rotor are attracted and rotated in the right direction, and the pole teeth of the rotor are facing the magnetic pole 1.
It stands still in alignment with the pole teeth -3 and 1-4. The rotation angle of the rotor at this time is 1/4 pitch, which is the initial deviation angle.

However, the operation of the rotor does not immediately reach a new position advanced by 1/4 pitch by switching the energized windings, but rather moves back and forth around the new position advanced by 1/4 pitch as shown in Figure 3a. Normally, it oscillates and finally comes to rest at the 1/4P position while performing damped oscillations in which the amplitude of vibration gradually decreases.

Therefore, in a stepping motor, the rotor rotates while vibrating every time the energized windings are switched, and the rotor's vibration period may vary depending on the switching timing of the energized windings. This causes a problem in that the vibration amplitude exceeds a predetermined step angle and the step does not move accurately, leading to a step-out state and stopping.

[Purpose of invention]

The object of the present invention is to suppress vibrations in the operation of the rotor of a stepping motor as described above and to prevent step-out.

[Summary of the idea]

The rotor of the stepping motor of the present invention includes a stator comprising a magnetic pole having a plurality of pole teeth and a winding, and a stator having pole teeth on its outer periphery that are opposed to the pole teeth of the stator through a gap. In a stepping motor comprising a rotor equipped with a rotor, conductors reaching both ends of the rotor are provided in valleys formed between pole teeth of the rotor, and The present invention is characterized in that conductor portions for electrically connecting the ends of the conductor are provided on both end faces.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIGS. 4a and 4b, pole teeth 6 are provided on the outer periphery of the rotor 6 so as to extend in the axial direction.
-10, a plurality of conductors 7 reaching both ends of the rotor are provided along the valleys formed between them, and ring-shaped conductors 8, 8 are provided at both ends of the rotor along the valleys. It is electrically connected to the ends of a plurality of conductors 7 provided along the same line.

[Effect of idea]

Since the rotor of the stepping motor of the present invention has the above-described configuration, a ring-shaped conductive circuit is formed around each of the plurality of pole teeth 6-10 by the conductor 7 and the ring-shaped conductor 8. . When the rotor shown in FIGS. 4a and 4b equipped with such a ring-shaped conductive circuit is combined with the stator of the stepping motor shown in FIGS. 1a and 1b, the next winding of the stator is excited and rotates. When the child's pole teeth are attracted and start rotating, the magnetic flux passing through the pole teeth changes, causing current to flow through the ring-shaped conductive circuit provided in the pole teeth, which acts to slow down the rotor's motion. However, as shown in FIG. 3b, the rotor's over-rotation is suppressed, vibrations are reduced, and the rotor stabilizes at its new position within a short period of time. As a result, vibration and noise, which are problems in the operation of the stepping motor, are reduced, the time required to reach a stable point is shortened, and response characteristics are improved.

As shown in FIGS. 5a and 5b, the present invention has a permanent magnet 9 between the rotor magnetic poles 6-1 and 6-2 having pole teeth.
It can be similarly applied to a permanent magnet type rotor that is integrally fixed with the rotor in between.

Further, the conductor 7 provided in the valley of the pole tooth and the ring-shaped conductor 8 provided at the pole tip can be formed by integrally casting aluminum or an alloy such as zinc by die casting. The portion can also be formed from a conductive paint made of metal powder and synthetic resin.

[Brief explanation of the drawing]

Figures 1a and b are longitudinal front and side views of a conventional stepping motor, Figure 2 is a developed view for explaining its operation, and Figures 3a and b are illustrations of vibration states of the conventional and inventive rotors. , FIGS. 4a and 4b are a vertical front view and a side view of the rotor of the present invention, and FIGS. 5a and 5b are a vertical front view and a side view of another embodiment of the rotor of the present invention. 1...Stator iron core, 1-1 to 1-8...Magnetic pole,
1-10, 6-10...Polar teeth, 2-1 to 2-8...
...Winding, 3...End bracket, 4...Bearing,
5...Rotor shaft, 6...Rotor, 7, 8...Conductor, 9...Permanent magnet.

Claims (1)

[Claims for Utility Model Registration] (1) A stator comprising a magnetic pole with a plurality of pole teeth and a winding, and a stator having pole teeth on its outer periphery that are opposed to the pole teeth of the stator through a gap. In a stepping motor comprising a rotor equipped with a rotor, conductors reaching both ends of the rotor are provided in valleys formed between pole teeth of the rotor, and A rotor for a stepping motor, characterized in that conductor portions are provided on both end faces to electrically connect the ends of the conductor. (2) The stepping motor rotor according to claim 1, wherein the conductors provided at the valleys of the rotor pole teeth and at the end faces of the rotor are made of a metal material. (3) The stepping motor rotor according to claim 1, wherein the conductors provided on the troughs of the rotor pole teeth and the end faces of the rotor are made of conductive paint.