JPH01264550A - Manufacture of rotor for rotary electric machine - Google Patents

Abstract

PURPOSE:To obtain a rotor having high reliability by providing a plurality of slots extending axially on the outer periphery of a rotor shaft and a ringlike slots at both ends of the slots, disposing a rotor bar and an end ring in the slots, then covering the shaft with a can to vacuum-seal it, and applying high temperature and high pressure in inert gas. CONSTITUTION:A plurality of slots 3 extending axially and ringlike slots 4 at both ends of the slots 3 are provided on the outer periphery of a rotor shaft 1, A rotor bar 2 is disposed in the slot 3 provided axially, and end rings 5 are disposed in the ringlike slots 4 at both ends of the bar 2. After they are enclosed by a can 6, it is pressurized (for 1-2hours) by high temperature (e.g., 800-950 deg.C) and high pressure (e.g., 500-1000kgf/cm<2>) atmosphere, the shaft 1, the bar 2 and the ring 5 solid-adhere together with the can 6 to be integrated.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a method of manufacturing a rotor for a rotating electric machine.

(Prior Art) In general, rotary electric machines based on various principles have been manufactured and used, and the most common and frequently used one is an induction motor. The rotor of this induction motor has grooves,
In many cases, aluminum rows 1 to 2 bars passing through the grooves and end rings disposed at both ends of the laminated core are simultaneously die-cast using a die-casting machine.

The rotor manufactured in this manner requires a die-casting mold, so unless it is mass-produced, there will be no loss of 1-merit.

Therefore, it is not suitable for special products that are produced in small quantities. Also, there are some things that cannot be designed that way. For example, when it comes to small-capacity, ultra-high-speed rotating electric machines such as 15OW-200000R7M, the end rings and laminated cores may break during rotation, and the bearings must be air bearings, magnetic bearings, etc. The diameter must be a round bar with no difference in diameter from the rotor outer diameter. Therefore, the rotor is formed by directly digging grooves for the rotor bar and grooves for the end ring in the shaft material, hammering in copper bars, fitting the end ring, and soldering with silver.

(Problem to be Solved by the Invention) However, even the rotor of the induction motor manufactured as described above cannot withstand extremely high speed rotation. That is, the machining accuracy is unstable due to hammering and fitting, and silver brazing is not reliable at such high speed rotation, and it takes a lot of man-hours.

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a method for manufacturing a rotor for a rotating electrical machine that is suitable for extremely high speed rotation, is robust, and can shorten the manufacturing time.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a plurality of grooves extending on the outer periphery of the rotor shaft and ring-shaped grooves circumscribing both ends of the grooves are provided. Then, the rotor bar is divided into a plurality of end rings embedded in the ring-shaped groove in the axial groove, the outer periphery of the rotor shaft is covered with a vacuum-sealed can, and further exposed to a high temperature and high pressure atmosphere. Pressure is applied to the shaft,
A rotor for a rotating electrical machine is manufactured by a method of solid phase joining and integrating a row 1 helper and an end ring.

(Function) In the rotor of a rotating electrical machine manufactured in this way, the rotor bar and the rings are solid-state bonded to each other in a high temperature and high pressure atmosphere on the rotor shaft. It is possible to obtain a rotor that is robust and highly reliable even at ultra-super high speed rotation.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is an external view of a rotor according to an embodiment of the present invention, and FIG.
Figures 3 and 3 are model diagrams showing the manufacturing process,
2 is a cross-sectional view taken along line Y--Y in FIG. 3, and FIG. 3 is a vertical cross-sectional view taken along line XX in FIG. 2. Rotor shaft (
On the outer periphery of 1), there are multiple grooves ■ extending in the axial direction and this groove (3
) are provided with link-shaped grooves O) at both ends, and rows 1 to rubar (■) are arranged in the groove () provided in the axial direction. −
After arranging ring 0 and covering them with can 0,
High temperature (e.g. 800-950°C) and high pressure (e.g. 5
Pressure is applied (1 to 2 hours) in an atmosphere of 00 to 100,100 O/d), and the rotor shaft (1), the rotor bar (2), and the lower ring (c) are solid-phase joined to the can 0 and integrated.・ By manufacturing the rotor in this way, each member is solid-phase welded, integrated, and tightly adhered to each other, resulting in a rotor that is robust and highly reliable against high-speed rotational motion, and improves mechanical balance and electrical Improves physical characteristics.

It should be noted that the present invention is not limited to the above-described embodiment; for example, if relatively strength is not required, the can may be shaved off. Further, the outer peripheral portion of the rotor shaft may be a laminated iron core. Furthermore, the same effects as in the second embodiment can be obtained regardless of the shape of the stomach, whether it is a rectangular cross section as shown, a square cross section, or a horizontal cross section.

[Effects of the Invention] As explained above, according to the present invention, a plurality of grooves extending in the axial direction are provided on the outer periphery of the rotor shaft, and ring-shaped grooves are provided at both ends of the grooves. After installing the roller 1~rubar and end ring in the groove, cover the rotor shaft with a can, vacuum seal it, and apply high temperature and pressure in an inert gas chamber.
．． Since each member is solid phase bonded and integrated, it is possible to manufacture a highly reliable rotor of a rotating electrical machine that is robust, has good mechanical resistance, and has good electrical characteristics.・

[Brief explanation of the drawing]

FIG. 1 is an external view of a rotor according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view for explaining the manufacturing process of the rotor shown in FIG. 1, and FIG. 3 is a vertical cross-sectional view for explaining the manufacturing process of the rotor shown in FIG. 1. 1... Rotor shaft 2... Rotor bar 3.4
... Mizo 5 ... Endring 6 ... Can's agent Patent attorney Nori Chika Kensuke ・ ・ Same S disciple Ken Marupa

Claims (1)

[Claims] A plurality of grooves extending in the axial direction and a ring-shaped groove circumscribing both ends of the grooves are provided on the outer circumference of the rotor shaft, and a rotor bar is placed in the groove provided in the axial direction, and an end is placed in the ring-shaped groove. After burying the ring, the outer periphery of the rotor shaft is covered with a vacuum-sealed can, which is then pressurized in a high-temperature, high-pressure atmosphere to solid-phase bond and integrate the shaft, rotor bar, and end ring. A method for manufacturing a rotor for a rotating electrical machine, characterized by: