JPS6026501Y2 - rotor of rotating electric machine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotor for a rotating electrical machine with an improved ventilation cooling structure.

Conventionally, a rotor of a rotating electrical machine in which a balance weight mounting plate is interposed between laminated cores stacked in the axial direction has been constructed as shown in FIGS. 1 and 2.

In these Figures 1 and 2, 1 is a shaft, 2 is a spider welded to this shaft 1 or cut out from the shaft 1, and 3 is a spider that is laminated in the axial direction and fitted and fixed to this spider 2. A laminated iron core made of thin plate, 4 is this laminated iron core 3
5 is a balance weight mounting plate interposed between the laminated cores 3, □6 is a balance weight inserted into the outer periphery of the balance weight mounting plate 5, and 7 is a clamper for positioning and fixing the laminated core 3. A duct piece 8 is provided on the outer periphery of the laminated core 3, and is fixed to the surface by spot welding and forms a horizontal ventilation passage 7a in the radial direction of the laminated core 3 by being sandwiched between the laminated cores 3. The rotor winding is fitted into the groove, 9 is a short circuit ring soldered to both ends of the rotor winding 8, and 10 is cooling air.

Next, the operation of such a conventional rotor will be explained.

That is, the rotor induces a current in the rotor winding 8,
Alternatively, by supplying it, electric power or electric power is generated outside the rotating electric machine.

Therefore, heat is generated from the rotor winding 8 due to resistance loss, and furthermore, heat due to iron loss is generated from the laminated iron core 3 in the dielectric machine.

For this reason, the rotor is cooled by flowing a refrigerant inside.

In this case, air is used as the refrigerant in rotating electric machines up to several hundred KW class, and as shown in FIG. Then, it exits in the radial direction of the laminated core 3 through the concave ventilation passage 7a formed by the duct piece 7, thereby cooling the rotor.

The balance weight mounting plate 5 is provided between the laminated cores 3 in a large-capacity, high-speed rotating electric machine, and the balance weight 6 is attached to an appropriate location on the outer periphery of the plate to adjust the balance of the rotor.

However, in such a conventional rotor, as described above, the duct piece 7 forming the ventilation passage 7a for cooling is
is fixed to the laminated iron core 3 by welding, so in the case of a rotor of a large-capacity, high-speed rotating electrical machine, the duct piece 7 is fixed to the laminated core 3 by welding.
A large centrifugal force is applied to the duct piece 7, and an excessive force acts on the laminated iron core 3 to which the duct piece 7 is fixed, which is dangerous in terms of strength.

This invention was made in order to eliminate the above-mentioned drawbacks, and the purpose is to provide a rotor for a rotating electrical machine that has improved strength and safety by forming a ventilation path for cooling air on the balance weight mounting plate. With the goal.

An embodiment of this invention will be described below with reference to FIGS. 3 and 4.

FIG. 3 is a sectional view showing an embodiment of the rotor of a rotating electric machine according to this invention, and FIG. 4 is a sectional view taken along the line IV-rV in FIG. 10
are similar to FIGS. 1 and 2, respectively.

11 is a balance weight mounting plate interposed between the laminated iron cores 3; 12 is formed by welding or cutting out from the balance weight mounting plate 11 on the surface of the balance weight mounting plate 11, and has grooves in the radial direction of the balance weight mounting plate 11; This is a duct piece that forms a ventilation passage 13.

That is, in such a rotor, when the rotor rotates, centrifugal force is applied to all the constituent members, and thus also to the duct piece 12, toward the outer circumferential side in the radial direction.

This centrifugal force on the duct piece 12 is
Acts on the board to which it is attached.

In a conventional rotor, this plate is a laminated core 3. More specifically, since the laminated core 3 is made of thin steel plates, the centrifugal force applied to the duct piece 7 (see Figures 1 and 2) greatly increases the stress in the thin steel plates. The balance weight mounting plate 11, which has a large thickness, receives the centrifugal force applied to the duct piece 12.

Since this balance weight mounting plate 11 is made of several dozen of the above-mentioned thin steel plates, the influence of the centrifugal force of the duct piece 12 on the mounting plate (balance weight mounting plate 11) is extremely small, and its strength is almost negligible. It can be ignored.

Further, in the above embodiment, a case has been described in which this invention is applied to an induction machine, but it goes without saying that it can also be applied to a synchronous machine, and the same effects as in the above embodiment can be achieved in this case as well.

As described above, according to this invention, since the ventilation passage 13 for cooling air is formed in the balance weight mounting plate 11, safety in terms of strength is improved, and the rotor of a large-capacity, high-speed rotating electrical machine can be moved further away. It has the effect of being similar.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a rotor of a conventional rotating electrical machine, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a sectional view showing an embodiment of the rotor of a rotating electrical machine according to this invention. , FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. DESCRIPTION OF SYMBOLS 1... Shaft, 3... Laminated iron core, 11... Balance weight mounting plate, 12... Duct piece, 13... Ventilation duct. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a rotor of a rotating electric machine in which a balance weight mounting plate is interposed between laminated cores stacked in the axial direction, the balance weight can be fixed by forming a duct piece projecting on the surface of the balance weight mounting plate in the direction in which the axis of rotation extends. A rotor for a rotating electric machine, characterized in that a ventilation passage is formed in the radial direction of a mounting plate.