JPS6321413B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating field pole, and more particularly to a rotating field pole that includes a rotor rim having ventilation grooves for circulating cooling air in a radial direction, and has a magnetic pole attached to the outer periphery of the rotor rim.

As shown in FIG. 1, this type of rotating field pole generally has ventilation grooves 1 extending in the radial direction at predetermined intervals in the stacking direction, and dovetail grooves 2 extending in the axial direction on the outer periphery of the ventilation grooves 1. rotary rim with 3
and a magnetic pole 4 fixed to the outer periphery of this rotor rim 3.
The magnetic pole 4 is formed from a field core 5 fitted to the outer periphery of the rotor rim via the tab tail groove 2 of the rotor rim, and a field wire ring 6 wound around the field core 5. ing. In the figure, 7 is a wedge inserted into the fitting portion between the magnetic pole 4 and the tab tail groove 2.

In order to fit and fix the magnetic pole 4 to the rotor rim 3 with the rotating field pole configured in this way, as shown in FIGS. 2 and 3, in the process of fitting,
A predetermined gap _g2 is created between the bottom of the tabtail groove 2 and the bottom of the dovetail 2p of the field core 5 that fits into the tabtail groove 2, and the rotor rim is connected to the bottom of the field core 5. The magnetic pole 4 and the rotor rim 3 are arranged so as to be shifted in the axial direction so that a predetermined gap g ₁ is created between the magnetic pole 4 and the outer peripheral surface of the rotor rim 3. Next, while maintaining the predetermined gaps g ₁ and g ₂ , the magnetic pole 4 is inserted into the dovetail groove 2 of the rotor rim 3 from the axial end, and
When they are inserted to a predetermined position, they are aligned in a direction that reduces the gaps g ₁ and g ₂ , and then a wedge 7 is driven in to fix the magnetic pole 4 and rotor rim 3 .

By the way, since the joint surface a between the field core 5 and the rotor rim 3 after this fitting becomes a passage for magnetic flux, the field core 5 and the rotor rim 3 must be brought into close contact with each other. Therefore, as shown in FIGS. 2 and 3, if a support member 10 consisting of a support fitting 8 supporting the field wire ring and a tightening bolt 9 is interposed on the joint surface a, the flow of magnetic flux is prevented. Therefore, it is necessary to ensure that the support member 10 does not remain on this joint surface a, or to secure a sufficient joint surface a as a path for magnetic flux even with the support member 10 interposed. .

FIG. 4 is an example of a countermeasure against this problem, in which the supporting member is not removed from beginning to end. In other words, the field core 5
A notch 11 is provided at the joint surface with the rotor rim,
The support fitting 8 and the tightening bolt 9 of the support member 10 are provided in this notch 11. In this way, a joint surface b in which the field core 5 and the rotor rim 3 are in close contact with each other can be obtained. However, with this configuration, the provision of the notch 11 tends to reduce the area through which the magnetic flux passes.

Further, FIG. 5 shows another example of countermeasures. In this case, the height of the field wire ring 6 is made somewhat low, and a supporting member is attached to the space. In this way, the support member 10
Since the field core 5 and the rotor rim 3 are in close contact with each other, a joint surface c can be obtained. However, in this case, not only must the field wire ring 6 be made smaller, but also an unnecessary gap of length h is formed between the rotor rim 3 and the field wire ring 6, as shown in the figure. It will be done.

As these methods all had their own drawbacks, they were adopted in very limited models, and in general, the support fitting 8 and the tightening bolt 9 were used when carrying the magnetic pole 4 individually. When assembling the coil into the rotor rim 3, the supporting metal fittings were removed and a separately prepared tool was used to assemble the coil while keeping it from falling off the field core. Therefore, a large number of man-hours are required to assemble and remove the magnetic pole 4 into the rotor rim 3.

The present invention has been made in view of the above points,
The purpose is to provide a rotating field pole whose assembly with the rotor rim is easy.

That is, in the present invention, the support member is formed to have a thickness smaller than the gap formed between the bottom surface of the field core and the rotor rim surface, and a width smaller than the ventilation groove width. teeth,
In order to achieve the intended purpose, it is attached to the lower surface of the magnetic pole and to the part facing the ventilation groove when the magnetic pole is assembled into the rotor rim.

The present invention will be described below based on illustrated embodiments. An embodiment of the present invention is shown in FIGS. 6-9. Note that parts that are the same as those in the prior art are designated by the same reference numerals, and therefore their explanations will be omitted. In this embodiment, the support member 10a has a thickness that falls within a predetermined gap _g1 formed between the field core 5 and the rotor rim 3 when the magnetic pole 4 is fitted from the end of the rotor rim 3, and The support member is formed to have a width that fits into the ventilation groove 1 provided in the rotor rim, and furthermore, this support member is formed on the lower surface of the magnetic pole and faces the ventilation groove of the rotor rim when the magnetic pole is assembled into the rotor rim. It is installed in the position where it is located. That is, the support member 10a attached to the lower surface of the magnetic pole 4
In the process of moving and fitting into the rotor rim 3 in the axial direction (see Fig. 10), the magnetic pole ₄ moves within the gap g1 formed between the field core 5 and the rotor rim 3. When the magnetic pole 4 is at the specified position in the axial direction, move it toward the rotor rim 3 (see Figure 9).
In this case, it will enter the ventilation groove 1. By doing this, the magnetic pole 4 can be inserted into the rotor rim 3 without any problem even with the support member 10a attached, and when the magnetic pole 4 is fixed at a predetermined position, the rotor rim 3 can be inserted as it is without removing the support member 10a. It can be built into and fixed. The fact that the support member 10a enters the ventilation groove 1 in this way (see FIGS. 7 and 8) means that a close contact surface d is obtained between the field core 5 and the rotor rim 3, and the necessary A path for magnetic flux can be secured. Note that the support member 10a is formed of a support metal fitting, a tightening bolt, or the like.

As described above, the present invention provides that the support member has a thickness smaller than the gap formed between the field core and the rotor rim when the magnetic poles are fitted into the rotor rim, and a width smaller than the ventilation groove width. In addition, this member is attached to the lower surface of the magnetic pole and to the part facing the ventilation groove when the magnetic pole is assembled into the rotor rim.
The magnetic poles can now be assembled and fixed in the rotor rim with the support member attached, ensuring a sufficient magnetic flux path and making it easy to assemble the magnetic poles to the rotor rim, making it easy to assemble the magnetic poles and rotor rim. Field poles can be obtained.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional rotating field pole, Figure 2 is a front view of the conventional rotating field pole when the magnetic pole is assembled, Figure 3 is a side view of Figure 2, and Figure 4 is a conventional rotating field pole. FIG. 5 is a front view of the main part of a rotating field pole showing how the support member is attached to another example of the rotating field pole; FIG. FIG. 6 is a front view of the main part of the rotating field pole of an embodiment of the rotating field pole of the present invention, FIG. 7 is a side view of FIG. 6, and FIG. 8 is the rotating field pole of the present invention. FIG. 9 is an enlarged view of the vicinity of the wedge in one embodiment, and FIG. 9 is an enlarged view showing the state when the field core is assembled. 1... Ventilation groove, 2... Dovetail groove, 3... Rotor rim, 4... Magnetic pole, 5... Field iron core, 6...
Field wire ring, 10a... support member.

Claims (1)

[Claims] 1 A rotor rim having ventilation grooves extending in the radial direction at predetermined intervals in the stacking direction, and a dovetail groove extending in the axial direction on the outer periphery, and a rotor rim that is fitted and fixed to the outer periphery of the rotor rim through the tabtail groove. A rotating field pole comprising a magnetic pole, the magnetic pole having a field core, a field wire ring wound around the field core, and a support member holding the field wire ring on the field core. wherein the support member has a thickness that fits within a gap formed between the bottom surface of the field core and the surface of the rotor rim when the magnetic pole is fitted to the rotor rim, and fits within the ventilation groove. The support member is formed to have a width, and the supporting member is attached to the bottom part of the magnetic pole and to the part facing the ventilation groove of the rotor rim when the magnetic pole is assembled into the rotor rim. Rotating field poles.