JPS6338695Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the improvement of the rotor of a rotating electric machine, and is particularly aimed at maintaining a good rotational balance of the rotor.

Figures 1 to 4 show conventional rotors. In the figures, 1 is a shaft, 2 is a rotor core fixed to the shaft 1, and this rotor core 2 is shown in Figure 4. The iron core 7 is constructed by stacking individual iron cores 7 like this one on top of the other. Reference numeral 3 designates end rings disposed at both end portions of the rotor core 2, on which end ring fans 4 and dowels 5 are provided. Reference numeral 6 denotes a balance weight, which is fixed by caulking the dowel 5 so that the rotor rotates while maintaining balance.

By the way, as shown in FIG. 4, the iron core 7 before being laminated and fixed to the shaft 1 has a plurality of slots 8 into which aluminum to be a conductor is cast, a hole 9 into which the shaft 1 is inserted, and a hole 9 into which the shaft 1 is inserted. A key groove 10 formed in a part of the punch hole 9 is provided.

The key grooves 10 are provided for the following reason: the cores 7 punched out one by one by a press can be stacked with the key grooves 10 as a guide, so that they will always be stacked in one direction with precision and will not become disjointed. The stacked cores 7 are then die-cast from aluminum as a conductor, and the rotor core is then shrunk-fitted and fixed to the shaft 1 to form the rotor.

Therefore, the keyway 10, which is necessary for stacking each core 7 with high precision, acts as a hindrance to the rotational balance after the rotor is constructed. As a countermeasure to balance this, a key is struck in the gap created between the keyway 10 and the shaft 1 to balance it, and a balance weight 6 is attached to the dowel 5 on the keyway 10 side.
Attach the dowel on the opposite side of the keyway 10.
As shown in a, the unbalance is corrected by removing it.

In this way, in the conventional rotor, it is necessary to attach the balance weights 6 to a large number of dowels 5, which makes the manufacturing process complicated.Moreover, when the rotation speed increases, the dowels 5 may break or the dowels may not be properly fixed to each other. There was a risk that the balance weight 6 would fly off.

This idea was made in order to eliminate the above-mentioned drawbacks of the conventional technology, and includes a keyway provided in the hole in the core, and a balance hole to balance the rotation at a position opposite to the hole in the core. It is an object of the present invention to provide a rotor that facilitates the work for correcting the balance and is free from the risk of the balance weight scattering due to breakage of the dowel or poor fixation with the dowel.

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 5, the same reference numerals as in FIG. 4 indicate the same or equivalent parts, and 11 is a balance hole provided in the iron core 7, which is provided at a substantially symmetrical position with respect to the keyway 10 via the shaft 1. ing.
When the rotor rotates, this balance hole 11 has the same rotational moment as the keyway 10, and functions to balance this rotation.

Note that the diameter of the balance hole ( ) can be easily set by considering the size of the keyway 10.

For this reason, the rotational balance of the iron core itself is maintained, and the balance is maintained considerably when the iron core 7 is laminated and fixed to the shaft 1 as shown in FIG.
Correcting the rotational balance by removing the balance weight 6 or attaching the balance weight 6 only requires fine adjustment.
This makes the adjustment work easier and prevents the dowel 5 from breaking and the balance weight 6 from flying off.

Further, if the keyway 10 and the balance hole 11 are used as guides when stacking the iron cores 7, the directional accuracy can be further improved. Furthermore, since the balance hole 11 is formed in the core by press punching, the manufacturing process does not become complicated.

As mentioned above, this idea provides a balance hole that balances the rotational moment with the keyway provided in the holed part of the core, and maintains the rotational balance of the core itself, making adjustments for balance correction possible. This has the effect of making the work easier and preventing breakage of dowels and scattering of balance weights, and the balance hole can be used as a guide hole when laminating the core.

[Brief explanation of drawings]

1 to 4 are for explaining the conventional device, respectively, in which FIG. 1 is a front sectional view showing the rotor, FIG. 2 is a partial view of the rotor showing the state of the dowels,
3 is a side view of the rotor, FIG. 4 is a side view of the rotor core, and FIG. 5 is a side view of the rotor core according to an embodiment of this invention. In the drawings, the same reference numerals indicate the same or equivalent parts; 1 is a shaft, 2 is a rotor core, 5 is a dowel, 6 is a balance weight, 7 is an iron core, 10 is a keyway, and 11 is a balance hole.

Claims (1)

[Scope of utility model registration request] In a rotor configured by fixing a rotating shaft and an iron core stacked on the rotating shaft, the iron core has a keyway for aligning the direction of the iron core,
A rotor for a rotating electrical machine, characterized in that a balance hole for equalizing rotational moments is formed substantially symmetrically with respect to the keyway via a rotation axis.