JPS6255382B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a magnetic pole having a solid cylindrical magnetic pole body is fixed to a yoke ring by a thin body bolt inserted into the center thereof, and a nut of the thin body bolt is attached to the yoke ring. This relates to the salient pole rotor located on the inner periphery of the rotor. Such a rotating machine is covered by the German Federal Patent DE-
It is known from OS2605539.

Rotating machines with such cylindrical poles are particularly used in diesel generators which are at high speeds and are therefore exposed to high centrifugal forces. In the known cylindrical magnetic pole, only the pole body is formed solid, and a thin body bolt is inserted into a hole located at the center, and the bolt head is fitted into a hole provided in the surface of the pole body that contacts the pole piece. and is welded to the pole body there. The pole piece has a rectangular bottom surface corresponding to the stator laminated core so that the magnetic flux is uniformly distributed over the entire effective surface inside the air gap. The magnetic pole piece is constructed of laminated layers and is welded to the magnetic pole body via an end plate and a frame. The manufacture of this magnetic pole is expensive and must be carefully carried out to withstand centrifugal forces.

The purpose of this invention is to facilitate the manufacture of cylindrical magnetic poles.

This object is based on the present invention in a rotating machine of the above type, in which a magnetic pole piece is integrally formed with the magnetic pole body in a cylindrical shape, and when the magnetic pole piece is assembled, two opposing parts adjacent to the magnetic pole gap are formed. Each edge is provided with a chamfered portion that is inclined with respect to the magnetic pole center line and runs parallel to each other, and the head of the thin body bolt is fitted into a counterbore provided in the upper part of the magnetic pole piece. This is achieved by welding. The entire pole thus consists of one solid cylindrical member for the pole body and the pole piece. The outer surface and the center hole for inserting the thin barrel bolt can be easily manufactured by lathe finishing. The chamfers provided on the two opposing edges of the pole pieces approximate the shape of an air gap that gradually increases to provide a desirable pole gap from the viewpoint of magnetic flux distribution. The lack of cross-sectional area at the corners in the case of a cylindrical pole piece compared to a pole piece with a rectangular base can be compensated for by slightly increasing the excitation current accordingly.

The thin body bolt is welded by fitting its head into a counterbore hole provided on the top surface of the magnetic pole piece.
It can be inserted radially from the outside to the inside. Therefore, in addition to being easy to access and work with, the length of the thin body bolt can be made relatively long.

It is best to lathe the pole pieces so that they are concentric with the rotor shaft. This can be easily done after attaching the magnetic poles to the rotor. This operation is carried out in a single lathe after the yoke ring with the magnetic poles has been fitted onto the shaft, so that the air gap is very accurately maintained.

If it is desired that the air gap be precisely sinusoidal, the pole pieces can be machined using a milling machine or a profiler.

Furthermore, it is advantageous if the edges of the pole pieces perpendicular to the rotor axis are ground down in accordance with the length of the stator laminated core.

Next, the present invention will be explained in detail based on an illustrated embodiment.

FIG. 1 is an axial cross-sectional view of a cylindrical magnetic pole according to an embodiment of the present invention attached to a yoke ring, FIG. 2 is an axis-perpendicular cross-sectional view of the cylindrical magnetic pole shown in FIG. FIG. 3 is a plan view of the cylindrical magnetic pole shown in FIG.

1 to 3, a plurality of cylindrical shapes are arranged at uniform intervals on a flat mounting surface 2 on the circumference of a bell-shaped yoke ring 1 of a salient pole rotating machine, for example, a high-speed electric motor. A magnetic pole 3 is arranged. In this cylindrical magnetic pole 3, the magnetic pole piece 4 has a solid magnetic pole body 5.
It is made in one piece. Therefore, the object in question is a cylindrical solid member whose outer shape is produced by lathe finishing. This cylindrical magnetic pole 3 supports an excitation winding 6 used for excitation of the salient pole rotational speed.

In order to provide a portion of the pole piece 4 adjacent to the pole gap 7 with a desired gradually increasing air gap, the pole piece 4 has two opposing edges (see FIG. 2) each inclined and tilted with respect to the pole center line. It is provided with one chamfer 8 in each case running parallel to each other.

In order to fix the cylindrical magnetic pole 3 to the yoke ring 1, a circular hole 10 is provided through the magnetic pole piece 4 and the magnetic pole body 5.
A thin body bolt 9 inserted into a circular hole 11 of a yoke ring 1 connected thereto is used.

The inserted head 12 of the thin barrel bolt 9 is inserted into a counterbore 13 having the same diameter and is welded there to the pole piece 4 via a weld seam 14. Excitation winding 6 and thin body bolt 9 on cylindrical magnetic pole 3
After attaching the bolts 9 to the yoke ring 1,
insert the threaded part into the circular hole 11 of the yoke ring 1.
It protrudes beyond the inner periphery 15 of and is fixed there with a nut 16. As a result, the cylindrical magnetic pole 3 is mounted tightly on the mounting surface 2 of the yoke ring 1. Due to this close attachment, no air gap is created between the magnetic pole body 5 and the yoke ring 1, so the fixation of the magnetic pole remains unchanged. After fixing the cylindrical magnetic pole 3 to the yoke ring 1, the final machining of the upper surface of the magnetic pole piece 4 facing the air gap is completed by lathe-finishing it concentrically with the rotor axis as shown by the broken line 17 in FIG. It will be done. The weld seam 14 must therefore be deep enough so that a smooth surface is obtained for the transmission of the magnetic flux.

Depending on the length of the stator laminated core (not shown), the pole piece 4 of the cylindrical pole 3 can be provided with two cut-outs 18 perpendicular to the rotor axis.

[Brief explanation of the drawing]

FIG. 1 is an axial cross-sectional view of a cylindrical magnetic pole according to an embodiment of the present invention attached to a yoke ring, FIG. 2 is an axis-perpendicular cross-sectional view of the cylindrical magnetic pole of FIG. 1, and FIG. FIG. 3 is a plan view of the cylindrical magnetic pole of FIG. In the drawings, 1 is a yoke ring, 3 is the entire magnetic pole, 4 is a magnetic pole piece, 5 is a magnetic pole body, 7 is a magnetic pole gap,
8 is the chamfered part, 9 is the thin body bolt, 12 is the head, 1
3 is a counterbore hole, 14 is a welded joint, 15 is the inner circumference of the yoke ring, 16 is a nut, and 18 is a cut portion.

Claims (1)

[Scope of Claims] 1. A magnetic pole having a solid cylindrical magnetic pole body is fixed to a yoke ring by a thin body bolt inserted into the center, and the nut of this thin body bolt is attached to the inner periphery of the yoke ring. In a rotating machine having a salient pole rotor, a magnetic pole piece is integrally formed with the magnetic pole body in a cylindrical shape, and in an assembled state, the magnetic pole piece has two opposing edges adjacent to the magnetic pole gap. Each has a chamfered portion that is inclined with respect to the center line of the magnetic pole and runs parallel to each other, and the head of the thin body bolt is fitted into a countersunk hole provided on the upper surface of the magnetic pole piece and welded. A rotating machine having a salient pole rotor. 2. A rotating machine having a salient pole rotor according to claim 1, wherein the magnetic pole piece is lathe-finished to be concentric with the rotor axis. 3. In the rotating machine according to claim 1, the salient pole is characterized in that an edge of the magnetic pole piece perpendicular to the rotor axis is cut to correspond to the length of the stator laminated core. A rotating machine with a rotor.