JPH1169675A - Winding field type rotor of dynamoelectric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding field type rotor of a dynamoelectric machine whose field cores can be securely fixed to its cylindrical core and can endure a number of times of removal regardless of excellency from the viewpoints of working ease and economy because of an easy fixing structure and the easiness of a fixing work. SOLUTION: In order to fix field cores 7 to a cylindrical core 6 (in order to prohibit the relative displacements of field cores in an axial direction), a spacer 9 which has a diameter large enough to be brought into contact with the one side end surfaces of respective stator cores 7 is put onto a shaft 5 and held between the stepped part 51 and the cylindrical core 6 to fix the spacer 9 to the cylindrical core 6 and the shaft 5. A collar 10 having a diameter large enough to be brought into contact with the other side end surfaces of the respective field cores 7 is employed. As a result, the displacements of the respective field cores 7 in the axial direction are prohibited by the collar 10 and the spacer 9 and hence the field cores 7 are fixed to the shaft 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a winding field type rotor used for a winding field type rotating electric machine.

[0002]

2. Description of the Related Art In a conventional winding field type rotor of a rotating electric machine, a plurality of field pole cores composed of a laminated iron core are formed at equal intervals in a circumferential direction around an outer peripheral portion of a cylindrical core fitted to a shaft. The field coil is wound around the field pole core. To fix the cylindrical core and the shaft, a stepped part and a low
A method is often used in which a knurl is provided, a cylindrical core is pressed into a knurl, and abuts against a stepped portion.

[0003] To fix the field pole core to the outer peripheral portion of the cylindrical core, a dovetail portion formed at a radially inner end of the field pole core is inserted into a locking groove of the cylindrical core from the axial direction. A method of caulking both ends of the core in the axial direction with a locking groove is often used.

[0004]

However, in the above-mentioned conventional winding field type rotor, only two places of the number of field pole cores are required for fixing the field pole core and the outer peripheral portion of the cylindrical core. Caulking needs to be performed, so the amount of work is large, and the caulking may be insufficient due to abrasion of the punch, etc. However, there is a problem in that the amount of eccentricity of the center of gravity of the rotation becomes large, and the correction thereof becomes troublesome.

Instead of caulking, consider a non-caulking fixing structure in which a special fixing member having one end fixed to the end face of the cylindrical core and the other end fixed to the end face of the field pole core by press-fitting a pin or the like. Is also possible. However, such a fixing method requires an increase in the number of parts, an operation of fixing both the cylindrical core and the field pole core and this special fixing member one by one, and a hole in the cylindrical core and the field pole core. It requires extra work such as opening, which often causes various problems such as impairing the magnetic properties of the core, so it was not realistic to adopt a fixing method other than caulking to fix both cores .

Further, there is a possibility that the axial position of each field pole core is slightly varied due to caulking, which may affect the characteristics. Furthermore, when the field pole core is removed from the cylindrical core for the purpose of, for example, replacing a broken or burned field coil, and then caulked again after the coil is mounted, it is not easy to remove the field pole core. It was not easy to do the work.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a fixed structure and a fixed work that is easy. Therefore, the field pole core is securely fixed to the cylindrical core despite excellent workability and economy. It is an object of the present invention to provide a winding field type rotor for a rotating electric machine which can endure removal of a field pole core many times as much as possible.

[0008]

According to the first aspect of the present invention, in order to fix the cylindrical core to the shaft, a stepped portion and a knurl are provided on the shaft, and the cylindrical core is fixed to the knurl. Press-fit, abut against stepped part and fix. The stepped portion may be manufactured by shaping the shaft itself, or may be manufactured by fixing a special stepped portion forming member such as a ring to the shaft by press fitting or caulking, for example. Of course.

Each field pole core made of a laminated iron core is fixed to the outer peripheral portion of the cylindrical core at a predetermined circumferential interval so as not to be detached in the radial direction. This locking is performed, for example, by inserting a dovetail portion formed at a radially inner end of the field pole core into a locking groove of the cylindrical core from the axial direction. The present invention is characterized in that the following means are employed for fixing each field pole core to the cylindrical core (for prohibiting relative displacement in the axial direction). First, a spacer having a diameter sufficient to be in contact with one end surface of each field pole core is fitted to the shaft, and is interposed between the stepped portion and the cylindrical core, and the spacer is fixed to the cylindrical core and the shaft.

Next, a collar is fitted and fixed (for example, press-fitted) to the opposite side of the cylindrical core so as to restrain the axial displacement between the rotor and the bearing. This color has a diameter enough to be in contact with the other end face of each field pole core. As a result, axial displacement of each field pole core is inhibited by the collar and the spacer, and the field pole core is fixed to the shaft. The winding field rotor of this configuration has the following operational effects.

First, as compared with the conventional caulking, each field pole core can be fixed in a step of press-fitting the collar into the shaft, for example, so that the man-hour required for the caulking process, which is a skilled work, can be greatly reduced. Since only one spacer with a low number of parts is added, the cost is hardly increased, and the cost is reduced by the above-mentioned significant reduction in the number of steps.

Further, since the field pole cores 7 are aligned in the axial direction by the disk-shaped spacers, there is no change in characteristics due to variations in the axial position of each field pole core. Furthermore,
Unlike conventional caulking, there is no trouble in fixing due to insufficient caulking, or it is difficult to remove the field pole core from the cylindrical core due to excessive caulking, and it can be easily removed many times Becomes

According to the second aspect of the present invention, in the winding field type rotor of the rotating electric machine according to the first aspect, a spacer is further newly added between the collar and the cylindrical core, and the spacer is formed by the spacer. Prohibition of axial relative displacement of the field pole core with respect to the core. In this case, in addition to the function and effect of the above-described configuration, a collar having a simple shape such as a sleeve (cylindrical) shape instead of a flange shape can be used, and the production of the collar is facilitated. .

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the winding field type rotor for a rotating electric machine according to the present invention will be described with reference to the following examples. (Embodiment 1) FIG. 1 is an axial sectional view of a vehicular generator using a winding field type rotor of a rotating electric machine of this embodiment, and FIG. 2 is an exploded perspective view of the winding field type rotor. Shown in

In this generator, as shown in FIG. 1, a winding field type rotor 1 includes a front housing 2 having one end opened,
It is housed together with the stator 4 in a housing comprising a rear frame 3 for closing the opening. The winding field type rotor 1 has a shaft 5, a cylindrical core 6, six field pole cores 7, a field coil 8, a spacer 9, a collar 10, a holding member 11, a fastening bolt 12, and a coil cover 13. The shaft 5 is rotatably supported on the front housing 2 and the rear frame 3 by bearings 14 and 15. A brush 16 supplies power to the field coil 8 through the slip ring 17. The shaft 5 has a stepped portion 51 adjacent to the bearing 15.

A total of six locking grooves 61 are formed in the outer peripheral surface of the cylindrical core 6 in the axial direction, and after the stepped field coils 8 are wound around the respective field pole cores 7, A dovetail portion 71 formed at the base of the magnetic pole core 7 is axially fitted into the locking groove 61, and each field pole core 7 is locked to the cylindrical core 6 so as not to be detached in the radial direction. Thereafter, a pressing member 11 is mounted so as to press the radially inner portion 81 of the stepped field coil 8 radially inward between the respective field pole cores 7, and furthermore, the pressing member 11 is formed into a cylindrical shape by tightening bolts 12. By fastening to the core 6, the field coil 8 is
To form a core assembly.

Next, the assembly of the above-mentioned winding field type rotor 1 will be described. First, the spacer 9 is fitted to the shaft 5, then the cylindrical core 6 of the core assembly is spline-fitted, and then the collar 10 is press-fitted to complete the wound field type rotor 1. . The bearing 14 is accommodated in a bearing hole of the front housing 2 and the shaft 5 of the winding field type rotor 1 assembled therein is fitted thereinto, and the assembling is completed.

Next, the features of this embodiment will be described.
Disc-shaped concave portions 62 are formed on both end surfaces of the cylindrical core 6, and the annular plate portion of the flange-shaped collar 10 and the annular plate-shaped spacer 9 are fitted into these concave portions 62. Both end surfaces of each field pole core 7 are arranged at the same axial position as the bottom of the concave portion 62 of the cylindrical core 6, and the annular plate portion and the spacer 9 of the flange-shaped collar 10 are
The diameter is larger than the bottom of the locking groove 61 of the cylindrical core 6. For this reason, the spacer 9 and the collar 10 prohibit the axial displacement of the rotor 1, and press the dovetails 71 of the respective field pole cores 7 locked in the locking grooves 61 so as to compress them in their axial directions. Prohibits displacement. (Embodiment 2) Another embodiment of a vehicular generator using a winding field type rotor of a rotating electric machine of this embodiment will be described with reference to FIG.

In this embodiment, a sleeve (cylindrical) collar 10a and a second spacer 9a are employed in place of the flange-shaped collar 10 in the first embodiment. The same operation and effect as described can be achieved, and the spacers 9 and 9a have the same shape, so that the structure of the collar 10 can be simplified and inexpensive.

[Brief description of the drawings]

FIG. 1 is an axial cross-sectional view of a generator employing a winding field type rotor according to a first embodiment.

FIG. 2 is an exploded perspective view of the winding field type rotor 1 shown in FIG.

FIG. 3 is an axial cross-sectional view of a generator employing the winding field type rotor of the second embodiment.

[Explanation of symbols]

 1: winding field type rotor 4: stator 5: shaft 6: cylindrical core 7: field pole core 8: field coil 9: spacer 10: collar 51: stepped portion of shaft 5 61: cylindrical core 6 Lock groove

Claims (2)

[Claims] A shaft having a stepped portion, a tubular core fitted and fixed to the shaft, and fitted to the shaft at a position opposite to the stepped portion across the tubular core. A plurality of collars which are fixed to prevent axial displacement of the rotor, and which are formed of laminated iron cores and which are fixed to the outer peripheral portion of the cylindrical core at predetermined circumferential intervals so as not to be detached in the radial direction. A winding field type rotor of a rotating electrical machine including a magnetic pole core and a field coil wound around the field pole core, wherein the magnetic field core is positioned between the stepped portion and the cylindrical core and fitted to the shaft. A winding field type rotor for a rotating electric machine, further comprising a spacer to be attached, wherein the collar and the spacer have a diameter sufficient to restrict axial displacement of the field pole core. 2. A shaft having a stepped portion, a tubular core fitted and fixed to the shaft, and fitted to the shaft at a position opposite to the stepped portion across the tubular core. A plurality of collars which are fixed to prevent axial displacement of the rotor and a laminated iron core and which are fixed to the outer peripheral portion of the cylindrical core at a predetermined circumferential interval so as to be incapable of being detached in the radial direction. In a winding field type rotor of a rotating electric machine including a magnetic pole core and a field coil wound around the field pole core, the winding between the stepped portion and the cylindrical core, and between the collar and the cylindrical shape A spacer that is fitted to the shaft and positioned between the core and the core to restrict displacement of the field pole core toward the stepped portion, wherein both spacers are disposed on the collar side of the field pole core. Characterized by having a diameter sufficient to limit displacement to Electric motor winding field type rotor.