JPH03143239A - Salient-pole dynamo-electric machine - Google Patents

Abstract

PURPOSE:To fix a rotor winding firmly regardless of the dispersion in finishing of the rotor winding by providing a groove in axial direction at the surface of a yoke, and locking the outer side of a rotor winding with a coil bracket fixed with a bolt, and at the same time pressing the bottom of the rotor winding with an S-shaped plate spring also fixed with said bolt. CONSTITUTION:A reverse-trapezoid groove 3c is provided over the whole width of magnetic poles in the axial direction, at the surface of a yoke caught with the magnetic poles.Two pieces of S-shaped plate springs are provided each at the bottom of the groove 3c, and a nearly trapezoid pressing plate 4 of aluminum material is arranged at the top. The plate spring 7 is compressed with the bottom of the insulating plate of a magnetic field coil 1 and is fixed with a bolt 9 for fastening of a bracket 5, which is inserted from outside in the hole piercing from left to right and from top to bottom of the pressing plate 4 and the plate spring 7. Hereby, regardless of the dispersion in finishing of the magnetic field coil 1, without using an adding/subtracting plate, etc., right and left electromagnetic coil 1 can be retained almost uniformly and firmly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention particularly relates to a salient pole rotating electric machine in which a coil bracket is provided on a rotor winding.

(Prior Art) In FIG. 5 showing a vertical cross-sectional view of a rotor of a conventional salient pole type synchronous machine and FIG. 6 showing a right side view thereof, the magnetic pole 2 of the yoke 3 has an insulating plate 6 on the outer periphery. A field coil 1 equipped with a magnetic field coil 1 is inserted, and a pole head 8 whose outer side is arcuate is fixed to the upper surface of the magnetic pole 2 by a pole 1- (not shown).

Further, between adjacent field coils 1, two approximately trapezoidal coil brackets 5 are each attached to the yoke 3 with bolts 9, and when the bolts 9 are tightened, the sides of the field coil 1 are attached to the brackets 5. This prevents the field coil from being deformed by the component Q of the centrifugal force F shown in FIG. 5 due to the rotation of the rotor.

Furthermore, at each of the four corners of the yoke 3 sandwiched between adjacent magnetic poles 2,
Ventilation holes 12 are provided in the axial direction, and on both sides of each corner, as shown in FIG. 7 showing details of the LIE jr section in FIG. 5 and FIG. 8 showing a right side view of this FIG. , four parts 3b are formed in the axial direction, and in these four parts 3b, a support plate 11 of a spring material ~ provided on both sides of the adjustment plate 14 on the upper surface is attached to a plate 13 crimped with rivets 5.
is fixed by welding and is bent by the field coil l by tightening the pole head 8 inserted into the magnetic pole 2.

(Problem to be solved by the invention) However, in the salient pole type rotating electric machine configured in this way,
The number of stacked adjustment plates 14 must be changed depending on the finished state of the field coil, which is not only troublesome, but also increases the work time required for caulking with rivets 15 and welding of shim plates 13.

Furthermore, the inner fan IO provided on the left and right sides of the magnetic pole 2 shown in FIG.
The cooling air in the axial direction is difficult to flow through the four corners of the yoke 3 because the supporting plate 11 and the like are obstructing it, so that the temperature on the inside of the field coil 1 becomes higher than on the outside.

Therefore, it is conceivable to increase the air volume by making the inner fan 10 larger, but this would increase the windage loss and reduce the efficiency of the salient pole rotating electric machine.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to obtain a salient pole type rotating electric machine that is easy to assemble and can improve the cooling effect.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a salient pole type rotating electric machine in which a coil bracket is fixed with bolts between the rotor windings, in which the rotor windings are inserted. A groove is provided in the axial direction on the surface of the yoke sandwiched between the magnetic poles, and an S-shaped leaf spring is provided that engages the bolt that fixes the coil bracket 1~ in this groove and presses the lower surface of the rotor winding. As a result, even if the outer shape of the rotor coil varies, the rotor winding can be firmly fixed, and the salient pole rotating electrical machine is easy to assemble and can improve the cooling effect.

(Example) An actual example of a salient pole type rotating electrical machine of the present invention will be described below with reference to the drawings. However, parts that overlap with FIGS. 5 to 8 are omitted.

FIG. 1 is a partial longitudinal sectional view of the salient pole type rotating electric machine of the present invention, and FIG.
The drawings are a detailed view of the section A and -A in FIG. 1, FIG. 3 is a detailed view of the "B" section in FIG. 2, and FIG. 4 is a CG sectional view of FIG.

In Figures 1 to 4, an inverted trapezoidal groove 3c is provided on the surface of the yoke 3 sandwiched between the magnetic poles 2 in the axial direction over the entire width of the magnetic pole 2, and an S-shaped groove 3c is provided at the bottom of the groove 3c. 2 leaf springs 7 each
A holding plate 4 made of aluminum and having a substantially trapezoidal upper surface is placed on the upper surface of the leaf spring 7, and as shown in FIG. The plate spring 7 is compressed by the plate 6, and as shown in FIG.
The holes 1 to 9 for tightening pass through the hole.

In the salient pole rotating electric machine configured in this way, the S-shaped leaf spring 7 is made thinner, soft but strong by increasing its length in the axial direction as shown in Figure 4. Because it can be used as a spring, it is possible to hold the left and right field coils 1 almost uniformly and strongly without using adjustment plates, regardless of variations in the finish on the field coils. The groove portion 3c in which the leaf spring 7 of the shape is provided is connected to the inner fan 10.
It serves as a ventilation passage through which cooling air in the axial direction passes with small pressure loss, and sends a large amount of cooling air from the groove 3c toward the outer stator core radial duct (not shown), as shown by the arrow 10a in FIG. As a result, the lower part of the field coil 1, which is particularly hot, can be efficiently cooled.

Furthermore, during assembly, there is no welding or caulking work, and the bolt 9 that tightens the coil bracket 5 is simply passed through the leaf spring 7, so the work is easy and the time is significantly shortened.
Since the number of parts is also reduced, a reliable salient pole rotating electric machine can be achieved.

In addition, in the above embodiment, the leaf spring 7 and the coil bracket 5
etc., although two are provided in each groove portion 3c, the number may be increased depending on the length of the field coil, and the length of the leaf spring 7 and the number of times of bending may also be changed.

Furthermore, the holding plate 4 is omitted, and the two end faces of the leaf spring 7 are oriented diagonally in the free state, and the ends are slightly horizontal so that the upper ends of the leaf spring 7 directly hold the left and right field coils. You may also do so.

Furthermore, although the leaf spring 7 is provided with a hole 7a through which the pole l-9 passes, the length of the leaf spring 7 may be changed depending on the number of leaf springs 7 installed in the groove 3c and the design conditions required for the leaf spring 7. The length between the inner sides of the pair of poles 1-9 in FIG. 4 may be omitted, and the plate spring 7 may be locked between one corner of the groove portion 3C and the inner side of the bolt 9.

〔Effect of the invention〕

As described above, according to the present invention, in a salient pole type rotating electric machine in which a coil bracket is fixed with bolts between the rotor windings, the shaft is attached to the surface of the yoke sandwiched between the magnetic poles in which the rotor windings are inserted. By providing a groove in the direction, and providing an S-shaped leaf spring in this groove that is engaged with a bolt that fixes the coil bracket and presses the lower surface of the rotor winding, it is possible to eliminate variations in the finish of the rotor winding. It is possible to obtain a salient pole type rotating electric machine in which the rotor winding can be firmly fixed, easy to assemble, and capable of improving the cooling effect.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical cross-sectional view showing one embodiment of a salient pole type rotating electric machine of the present invention, FIG. 2 is a detailed cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a section "B" in FIG. 2. Detailed view, FIG. 4 is a sectional view taken along the line C-C in FIG. 3, FIG. 5 is a partial vertical sectional view showing an example of a conventional salient pole rotating electric machine, and FIG. 6 is a sectional view taken along the line DD in FIG. 5. , Fig. 7 is a detailed view of the ll E II part in Fig. 5, and Fig. 8 is a right side view of Fig. 7. 1... Field coil 3... Yoke C ・Groove section... Coil bracket 7. Leaf spring 1.0... Inner door (8733)

Claims (1)

[Scope of Claims] In a salient pole rotating electric machine in which a coil bracket is fixed with bolts between rotor windings, an axial direction is provided on the surface of a yoke sandwiched between magnetic poles into which the rotor windings are inserted. A salient pole type rotating electric machine, characterized in that a groove is provided in the groove, and an S-shaped leaf spring is provided in the groove to be engaged with the bolt and press the rotor winding against a pole head attached to the magnetic pole.