JPH0323820Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention provides a round hole with a key groove in the axial direction from the end face of the rotating shaft, and also provides a relief hole for groove machining in the radial direction at the tip of the key groove. The present invention relates to a rotor for a rotating electric machine that is improved so that the rotational balance can be corrected with a simple structure.

[Conventional technology]

In the rotor of a rotating electrical machine in which a round hole with a key groove in the axial direction is provided from the end face of the rotating shaft so that the shaft to be coupled is inserted and fixed, the tip of the key groove 1 is generally inserted into the rotor as shown in Figures 3 and 4. Escape hole 2 for groove machining on the part
are provided in the radial direction, and the rotational unbalance due to the escape hole 2 is corrected by providing a hole 6 on the end face of the shorting ring 5 provided on the outer periphery of the end face of the squirrel cage rotor 4 fitted on the rotating shaft 3, on the outer periphery of the rotating shaft 3, etc. I processed it as appropriate to correct the rotational balance.

[Problem to be solved by the invention] For this reason, the number of holes 6 increases, and not only does it take time and effort to process the holes 6, but also the pumping action of the holes 2 makes it difficult to stir the liquid, especially when operating in a highly viscous liquid. There was a problem that losses increased and the efficiency of the submerged rotating electrical machine decreased.

This invention, in order to eliminate the above problems,
To provide a rotor for a rotating electrical machine that allows the rotational balance to be corrected with little effort without increasing stirring loss during operation.

[Means to solve the problem]

In order to achieve the above object, this invention forms a relief hole for groove machining at the tip of the key groove so as to penetrate to the outer peripheral surface on the opposite side.

[Effect]

By doing this, the relief holes for groove machining become vertically symmetrical, so that the rotational imbalance conventionally caused by the relief holes for groove machining is completely eliminated. A slight rotational unbalance left by the key groove can be corrected by a balance correction hole while connected to the load machine, so the correction hole can be omitted or a small number of correction holes can be used.

[Embodiment] FIGS. 1 and 2 show an embodiment of this invention, and the same parts as in FIGS. 3 and 4 are denoted by the same reference numerals. In these figures, a round hole 11 with a key groove is provided in the axial direction from the end surface of the rotating shaft 3, and a relief hole 32 for groove machining is formed at the tip of the key groove 1 to penetrate to the outer peripheral surface on the opposite side of the rotating shaft 3. I'm trying to correct the rotational balance. In addition, in order to correct the rotational balance including the rotational imbalance due to the clearance between the key and the coupled shaft (not shown), a hole 6 may be formed on the end face of the short-circuit ring 5 of the rotor 4 or on the outer periphery of the rotating shaft 3 as necessary. Process and fine-tune.

According to the embodiment described above, there is almost no need to machine the hole 6, and the relief hole 12 can be machined in advance in the rotating shaft 3, so that a simple structure can be achieved.

[Effect of idea]

According to this invention, in a rotor of a rotating electric machine, a round hole with a key groove is provided in the axial direction from the end face of the rotating shaft, and a relief hole for groove machining is provided in the radial direction at the tip of the key groove. The rotational balance can be corrected by penetrating the hole to the outer peripheral surface on the opposite side, so even when used as a submerged electric motor, the rotational balance can be corrected with less effort without increasing stirring loss during operation. You can get the effect that you can.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main part of an embodiment of this invention, Figure 2
The drawings are a side view of FIG. 1, FIG. 3 is a sectional view of a main part of the conventional example, and FIG. 4 is a side view of FIG. 3. 1...Key groove, 2...Rotating shaft, 4...Rotor, 11...Round hole, 32...Escape hole.

Claims (1)

[Scope of utility model registration request] In a rotor of a rotating electric machine, in which a round hole with a key groove is provided in the axial direction from the end face of the rotating shaft, and a relief hole for groove machining is provided in the radial direction at the tip of the key groove, the relief hole is provided on the outer peripheral surface on the opposite side of the rotor. A rotor for a rotating electric machine, characterized in that the rotor is formed by penetrating the rotor up to the point.