JPH0753396Y2 - Rotating machine rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a rotor of a rotary electric machine having an improved ventilation duct section.

[Conventional technology]

As is well known in the art, in a rotor of a rotating machine such as a DC machine, a ventilation duct for cooling is formed in an armature core. FIG. 3 and FIG. 4 show a conventional example of such a rotor. That is, as the ventilation duct, the axial duct 3 is provided in the axial direction of the armature core 1, and the radial duct 4 is provided in the direction perpendicular to the axial direction of the armature core 1. The axial duct 3 and the radial duct 4 communicate with each other. The axial duct 3 is composed of ventilation holes 3a provided in the iron core 1. Further, the radial duct 4 is provided for each stack thickness of a predetermined number of iron cores, and in order to secure a constant interval, a large number of rod-shaped duct pieces 6 radially arranged on the outer peripheral side of the end surface of the iron core 1.
It is composed of. Further, an annular spacing ring 5 is arranged so that the annular portion 1a between the ventilation hole 3a constituting the axial duct 3 and the outer circumference of the rotary shaft 2 is arranged so as not to be deformed by the pressing force from the side surface. The spacing ring 5 and the duct piece 6 are attached to the end surface of the iron core 1 by spot welding or the like. Further, like the rotor of the rotary electric machine described in Japanese Utility Model Laid-Open No. 1-131250, a plurality of ducts extending radially from the inner peripheral side to the outer peripheral side of the laminated core at regular intervals along the lamination direction of the laminated core. In the rotor in which the pieces are arranged, a plurality of ventilation holes extending in the stratification direction on the inner peripheral side of the laminated core are formed at equal intervals along the circumferential direction, the duct piece, than the ventilation holes There is a rotor of a rotary electric machine, characterized in that an annular portion on the outer peripheral side and an inner peripheral side between adjacent ventilation holes are divided with a gap provided therebetween.

[Problems to be solved by the device]

However, conventionally, the spacing ring 5 has an asymmetrical shape having the convex curved portion 5a for covering the key 7 for fixing the armature core 1 and the rotating shaft 2. For this reason, a bending process or the like is required for manufacturing, which requires a lot of work, and the cost becomes higher. In addition, there is a problem that the balance of the rotor becomes poor and smoothness of the rotating action is impaired.

Further, as in the rotor of the rotary electric machine described in Japanese Utility Model Laid-Open No. 1-131250, a plurality of duct pieces are arranged in the pillar portion between the ventilation holes provided on the inner peripheral side of the armature core. The friction between the rotary shaft and the laminated core is small because it is fitted to the rotary shaft only at the part. Therefore, it is not suitable for an electric motor that requires a large capacity or high torque. Further, as in the rotor shown in FIG. 2 which shows another embodiment, in the case where an annular strip portion is provided between the outer circumference of the rotary shaft and the ventilation hole, the duct piece is arranged in the column portion. In addition, the annular portion between the pillars is deformed and it becomes difficult to keep the distance constant, and the distance between the radial ducts is narrowed near the rotating shaft, reducing the cooling effect, or rotating the shaft. Looseness occurs in the fitting of the iron core. A large capacity DC motor with a rotor diameter of over 300 mm has a large effect. In general, the width of the pillar is 20 to 30 mm even for a relatively large capacity DC motor with a capacity of about 300 Kw, and it is not possible to fix multiple duct pieces with a plate thickness of 3 to 6 mm to this pillar by welding. Have difficulty.

The present invention has been made in view of the above circumstances, and the rotor of a rotary electric machine is well balanced, the smoothness of the rotating action can be improved, the manufacturing is easy, and the cost can be reduced. It is intended to provide.

[Means for Solving the Problems]

The present invention relates to an axial duct axially formed in an armature core so as to surround a rotary shaft, and the axial duct formed in a direction perpendicular to the axial direction for each predetermined axial core thickness of the armature core. In a rotor of a rotary electric machine having a radial duct communicating with, the radial duct is an annular portion between the outer circumference of the rotary shaft and the ventilation hole of the axial duct, the end face of the iron core surrounding the rotary shaft. And a plurality of rod-shaped members that are symmetrically arranged, and duct pieces that are radially arranged on the outer peripheral side of the end surface of the iron core.

[Action]

According to the present invention, since a plurality of rod-shaped members are symmetrically arranged around the rotary shaft by avoiding the key in the annular portion between the outer circumference of the rotary shaft and the ventilation hole forming the axial duct, spot welding is performed. The rotor is well-balanced, the manufacturing is easy, and the number of manufacturing steps of the rotor can be reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

This embodiment is for a rotor of a DC machine, and a ventilation duct for cooling includes a plurality of axial ducts 13 axially bored in the armature iron core 11 so as to surround the rotary shaft 12, and an armature iron core. The radial duct 14 is formed in a direction perpendicular to the axial direction at a predetermined core thickness of 11 in the axial direction, and the radial duct 14 and the axial duct 13 communicate with each other. The radial duct 14 is a plurality of spot-welded spots on the end face of the iron core in an arrangement surrounding the rotary shaft by avoiding the key 17 in the annular portion 11a between the outer circumference of the rotary shaft 12 and the ventilation holes 13a forming the axial duct 13. The rod-shaped member (15) and a plurality of rod-shaped duct pieces (16) radially arranged and spot-welded on the outer peripheral side of the end surface of the iron core.

The rod-shaped members 15 having, for example, an I-shaped cross section and the same length are arranged around the rotary shaft 12 at four equal intervals.
Any number may be used as long as it is balanced as a rotor. Further, it is obvious that the rod-shaped member 15 and the duct piece 16 may be the same.

According to this structure, the rod-shaped member 15 and the duct piece 16 are made by cutting, for example, an I-shaped or flat plate member and spot-welded to the end surface of the iron core. Can be realized. Moreover, since the rod-shaped members 15 are symmetrically arranged so as to surround the rotating shaft 12, the rotor is well balanced.

[Effect of device]

As described above, according to the present invention, in the annular portion between the outer circumference of the rotary shaft and the ventilation hole of the axial duct, a plurality of rod-shaped members symmetrically arranged around the rotary shaft and the outer peripheral side of the iron core are provided. Since the radial duct is configured by the duct pieces radially arranged in the, the rotor configuration is simple and easy to manufacture, the cost is reduced, and the rotor is well balanced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part of an embodiment of a rotor of a rotary electric machine according to the present invention, FIG. 2 is a cross-sectional view of an essential part of the AA line of FIG. 1, and FIG. A cross-sectional view of the main part, FIG.
It is a BB line principal part sectional drawing of a figure. 11 ... Armature core, 11a ... Annular part, 12 ... Rotation axis, 1
3 …… Axial duct, 14 …… Radial duct, 15…
… Rod-shaped member, 16… Duct piece.

Claims (1)

[Scope of utility model registration request] 1. An axial duct axially formed in an armature core so as to surround a rotary shaft, and the axial duct formed in a direction perpendicular to the axial direction for each predetermined axial core product thickness of the armature core. In a rotor of a rotary electric machine having a radial duct communicating with a duct, the radial duct is an annular portion between an outer circumference of the rotary shaft and a ventilation hole of the axial duct, and the iron core surrounds the rotary shaft. A rotor for a rotating electric machine, comprising: a plurality of rod-shaped members symmetrically arranged on an end face; and duct pieces radially arranged on an outer peripheral side of the end face of the iron core.