JPH0440930B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a rotor for a rotating electric machine, in which a rotor core is fitted and held in a rotor spider formed by welding and fixing to a hollow intermediate shaft portion of a rotating shaft. .

[Conventional technology]

For relatively large rotors such as DC motors, shrink fitting was used to secure the rotor spider holding the rotor core to the rotating shaft.

A conventional rotor of this type is shown in a front view and a side sectional view in FIGS. 3 and 4.
1 is a rotating shaft, 2 is a rotor spider, and is constructed as follows. 3 is a pair of bosses on both sides; 4 is a disk-shaped support plate welded to each boss 3;
Reference numeral 5 designates a plurality of coupling members axially spanning the outer peripheries of these support plates 4 and fixed by welding, and dovetails 5a are provided on the outer peripheries. 6 is both support plates 4
A plurality of reinforcing plates 7 are welded and fixed in between, and 7 is a connecting body welded and fixed between both bosses 3.

The rotor spider 2 configured as described above is
A rotor core 8 is held on each coupling member 5 by dovetail coupling means. A pair of clampers 9 clamp the rotor core 8.

As described above, the rotor spider 2 holding the rotor core 8 is fixed to the rotating shaft 1 by shrink fit, and the torque transmission between the two is by the interference caused by the shrink fit. . The number of bosses 3 and support plates 4 is determined depending on the magnitude of torque and the length of the rotor core.

Rotor core 8 and rotor coil (not shown)
The cooling air is cooled by passing cooling air through ventilation holes 4a provided in the support plate 4 and through radial ventilation ducts (not shown) provided between the iron cores 8.

[Problem that the invention seeks to solve]

In the conventional rotor as described above, torque is transmitted through the support plate 4, and the ventilation holes 4a cannot be made very large, which is not preferable in terms of ventilation cooling. Also,
The rotor spider 2 is fixed to the rotating shaft 1 by shrink fitting, and in the case of high-torque and high-speed machines, it is necessary to provide a large tightening margin, which increases the stress on the boss 3 and causes problems in terms of strength. There was a problem that the deflection became large and the strength was insufficient.

Furthermore, the rotary shaft 1 is an integral solid shaft, which poses problems such as increased weight.

This invention was made to solve these problems, and it improves the cooling effect, provides high torque,
The aim is to obtain a rotor for rotating electric machines that can handle high speeds and has reduced weight.

[Means for solving problems]

In the rotor according to the present invention, a rotating shaft is formed by integrally joining a shaft divided into three into one end side shaft part, a hollow intermediate shaft part, and the other end side shaft part, and this intermediate shaft part has an outer circumference. A plurality of support plates are arranged axially and radially and fixed by welding, a cylindrical support ring is welded and fixed to the outer periphery of these support plates, and a cylindrical support ring is arranged axially and radially to the outer circumference of the support ring. A rotor spider is constructed by welding and fixing a plurality of connecting members in the circumferential direction,
A rotor core is fitted and held in the outer periphery of these coupling members. The cylindrical support ring is provided with a plurality of radial ventilation holes.

[Effect]

In this invention, the hollow intermediate shaft portion is also used as a spider boss, and a rotating shaft is configured by connecting one end side shaft portion and the other end side shaft portion to this hollow intermediate shaft portion, and the rotor spider is heated. Connected without a fit. A large space is created in the circumferential direction between each support plate, increasing the amount of ventilation. The coupling member is firmly fixed and supported by the cylindrical support ring, and can withstand high torque and high speed.

〔Example〕

1 and 2 are a front sectional view and a side sectional view showing an embodiment of a rotor according to the present invention. In the figure, 11 is a rotating shaft, and one end side shaft part 1
It is divided into three parts: 2, a hollow intermediate shaft part 14, and the other end side shaft part 13. 15 is a rotor spider, which is constructed as follows. Reference numeral 16 denotes a plurality of support plates arranged radially at equal intervals around the outer periphery of the intermediate shaft portion 14 which also serves as a boss, and fixed by welding in the axial direction, and provided with ventilation holes 16a. 17 is each support plate 1
A cylindrical support ring is welded and fixed to the outer periphery of the support ring 5, and a plurality of ventilation holes 17a are radially bored therein. 18
Dovetails 18a are a plurality of coupling members welded to the outer periphery of the support ring 17 in the axial direction and at equal intervals in the circumferential direction. 19, 20, and 21 are welded and fixed to the tip side of each support plate 16 and the root side of the other adjacent support plate 16, respectively, between the inner circumference side of the support ring 17 and the outer circumference side of the intermediate shaft portion 14. The structure is made up of a truss structure with multiple reinforcing plates to provide high torsional rigidity.

The rotor core 8 is fitted into the tab tail 18a of each coupling member 18 of the rotor spider 15 configured as described above, and the rotor core 8 is coupled and held, and the clampers 9 are applied and tightened at both ends.

One end side shaft part 12 and one end side shaft part 13 are tightened and connected with bolts 22 to the intermediate shaft part 14 of the rotor spider 15 holding the rotor core 8, and the rotating shaft 1
This means that the rotor spider 15 is attached to the rotor spider 1.

The support ring 17 has a cylindrical shape, and each coupling member 18 is fixed to it, and can withstand large centrifugal force.
Each support plate 16 and each reinforcing rod 19 to 2 are attached to the intermediate shaft portion 14.
A support ring 17 is fixed by welding through the support ring 1, and can handle high torque and high speed.

In the above embodiment, the coupling member 18 is provided with a dovetail 18a, and the rotor core 8 is provided with a dovetail groove for coupling, but the coupling member may be provided with a dovetail groove and the rotor core may be provided with a dovetail.

Further, in the above embodiment, the rotor has a horizontal axis, but the present invention can also be applied to a rotor with a vertical axis.

〔Effect of the invention〕

As described above, according to the present invention, a cylindrical support ring is welded and fixed to the outer periphery of a hollow intermediate shaft of which the rotating shaft is divided into three, via a plurality of support plates arranged axially and radially, A rotor spider is formed by welding and fixing a plurality of coupling members in the axial direction and circumferential direction to the outer circumference of this support ring, and the rotor core is coupled and held to these coupling members, so that the rotor spider It is connected to the rotating shaft without shrink fitting, can handle high torque and high speed, and improves the ventilation cooling effect.

[Brief explanation of drawings]

1 and 2 are a front sectional view and a side sectional view showing an embodiment of a rotor of a rotating electric machine according to the present invention, and FIGS. 3 and 4 are a front view and a side sectional view of a conventional rotor. be. 8... Rotor core, 11... Rotating shaft, 12...
One end shaft portion, 13...Other end shaft portion, 14...Hollow intermediate shaft portion, 15...Rotor spider, 16...Support plate, 17...Cylindrical support ring, 17a...Ventilation hole, 18 ...Connection member, 19-21...Reinforcement rod.
Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A rotating shaft that is integrally formed by combining one end-side shaft portion, a hollow intermediate shaft portion, and the other end-side shaft portion that are divided into three parts, and a rotating shaft that is arranged radially at equal intervals around the outer periphery of the intermediate shaft portion, and A plurality of support plates are welded and fixed in the axial direction, and a plurality of support plates are welded and fixed to the tips of these support plates.
A cylindrical support ring in which a plurality of ventilation holes are drilled in the radial direction, and a truss in the circumferential direction is welded to each of the support plates, extending between the support ring side and the outer peripheral side of the intermediate shaft. The rotor includes a rotor spider composed of a plurality of fixed reinforcing rods and a plurality of coupling members axially welded and fixed to the outer periphery of the support ring and arranged at equal intervals in the circumferential direction. A rotor for a rotating electric machine, wherein a rotor core is coupled and held to each of the coupling members of a spider, and the one end shaft portion and the other end shaft portion are coupled to the intermediate shaft portion.