JPS6223532B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotor, and more particularly to a rotor whose unbalance can be easily adjusted.

Generally, a rotor is composed of an iron core, a coil, and a commutator, and if there is an imbalance in the iron core, adjustment is performed using component forces, as shown in FIG.

However, as shown in Figure 1A, if the unbalanced position is in the space between cores 1, the component forces F ₁ and F ₂ are divided into the core and adjusted at two points, as shown in Figure 1B. However, it is time consuming and has poor accuracy.

Another method is to adjust the balance by casting the core and windings as they are in a cylindrical shape with a thermosetting synthetic resin or other insulating material filling the space in the core. There is.
According to this method, the coil is affected by heat when it is filled with thermosetting resin. In addition, since the weight is large, the start-up characteristics are poor, and mechanical loss is also large.

The present invention has been proposed to improve the above-mentioned drawbacks.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows an embodiment of the present invention. In the figure, 1 is an iron core, this iron core is fixed to a shaft 2, and a coil 3 is wound around the iron core. 4
indicates a commutator. 5 is an unbalance compensation ring (hereinafter referred to as ring) made of a non-magnetic material;
A protrusion 6 is formed on the inner surface of this ring so that it can be inserted into a space between each phase of the iron core 1.

3A and 3B show exploded perspective views of the rotor of the present invention, in which a groove 7 for fitting a ring 5 is formed on the outer periphery of the iron core 1 on a plane perpendicular to the axis of the rotor. Further, the ring 5 is provided with a slit 8 in a part of its circumferential surface for fitting into the iron core.

Generally, the balance of a relatively long cylindrical body in the axial direction is often adjusted on two surfaces, so in the present invention, two grooves 7 are also formed in the iron temple. A non-magnetic ring 5 with a slit 8 and an inner diameter smaller than the groove diameter of the iron core 1 is fitted into the rotor after winding, as shown in Fig. B, and the slit is closed and tightened as shown in Fig. C. Fix it. As shown in Figure 2,
When the non-magnetic ring 5 is attached to the iron core, the outer diameter is made to match the outer diameter of the rotor, and the ring 5 is attached so that the protrusion 6 of the ring 5 fits into the space 9 between the iron cores. . Note that the thickness of this protruding portion is formed to be thick so as not to form a hole even when the balance is adjusted using a beam of light as will be described later.
For balance adjustment, the rotor can be easily balanced by applying the rotor to a balancing machine, detecting an unbalanced portion, and removing a portion of the periphery of the ring using, for example, a laser beam.

Note that when a portion of the periphery of the ring is removed using a laser beam or the like, it is preferable to remove a portion of the periphery corresponding to the protruding portion of the ring, since this can prevent holes from being formed in the ring due to the action of the laser beam.

FIG. 4 shows another embodiment of the present invention, in which iron plates 1a having a small outer diameter are fixed to both end surfaces of the iron core 1 as shown in FIG. Then, a non-magnetic ring 5 having the same outer diameter as the iron core 1 and without slits is attached to the iron plate 1a by welding or the like.
Figure A shows the inserted state.

As described above, the present invention includes an unbalance compensating ring made of a non-magnetic material, formed in a ring shape, and having a plurality of protrusions toward the center of the ring. For,
The center of the ring is aligned with the axis of the rotor, the ring body is arranged on a plane perpendicular to the axis of the rotor, and the protrusion of the ring is located at a location corresponding to the recess of the iron core. In addition, if an unbalanced part of the rotor is found due to the attachment, the balance can be easily adjusted by cutting a part of the ring with a laser beam or the like.

[Brief explanation of the drawing]

Fig. 1 A, B is an explanatory diagram of the unbalance adjustment method, Fig. 2 is a perspective view of the rotor of the present invention, Fig. 3 A, B, and C is an exploded perspective view, and Fig. 4 A, B, and C are exploded perspective views. An exploded perspective view of another embodiment is shown. 1... Iron core, 2... Shaft, 3... Coil, 4...
Commutator, 5...Ring, 6...Protrusion, 7...
Groove, 8...Slit, 9...Empty space.

Claims (1)

[Claims] 1. A rotor that has an iron core fixed around an axis, a coil wound around the iron core, and a commutator attached, which is made of non-magnetic material, is formed into a ring shape, and has a rotor that is oriented toward the center of the ring. Once, an unbalance compensation ring having a plurality of protrusions was placed with respect to the iron core of the rotor, so that the center of the ring coincided with the axis of the rotor, and the ring body was perpendicular to the axis of the rotor. A rotor, characterized in that the rotor is disposed on a surface, and is mounted such that the protrusion of the ring is located at a location corresponding to the recess of the iron core.