JPS6211182Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a ventilation cooling device for a salient pole rotor of a rotating electric machine such as a synchronous machine.

A conventional ventilation cooling device for a salient pole rotor of a synchronous machine is shown in FIGS. 1 and 2 as a vertical sectional view and a partial plan sectional view. The figure shows the vertical shaft type, where 1 is the rotating shaft, 2 is the rotor spider,
3 is a rim to which this rotor spider is firmly fixed, forming a yoke of the rotor. Reference numeral 4 denotes a plurality of radial ventilation ducts provided on this rim, and the tightening bolts 7 of the rim 3 are connected to the spacing ring 6 of the duct piece 5 having an L-shaped cross section.
By penetrating through the rim 3, a duct piece 5 is fixed between each layer of the rim 3 to form a ventilation interval.
8 is a nut for tightening the tightening bolt 7. Reference numeral 9 denotes a plurality of salient pole-shaped magnetic pole cores made of laminated thin steel plates, which are tightened by tightening bolts 10 and fixed to the outer periphery of the rim 3. 11 is a field coil fitted in the magnetic pole core 9, and 12 is a fan attached to the rim 3.

In the above-mentioned conventional device, when the rotor rotates, cooling air is passed by the fan 12 in the direction of arrow A, cooling the end of the field coil 11, and part of it flows between adjacent field coils 11 in the direction of arrow B. The other part of the cooling air passes through the end of the stator coil (not shown) as shown by arrow C and is cooled. Further, the cooling air that has entered the inner diameter side of the rotor spider 2 passes through the ventilation duct 4 as shown by arrow D, and flows between adjacent field coils 11 as shown by arrow E to be cooled.
The cooling air passing between the field coils 11 is subjected to the fan action of the salient poles, passes through the air gap G, and passes through the stator ventilation duct to cool the stator coils and stator core (both not shown).

For ventilation cooling of rotating electric machines, it is desirable to cool and dissipate the generated heat with the minimum necessary air volume; if the air volume is too large, wind loss will increase, and if it is small, the temperature rise will be excessive. At present, it is difficult to match the design value of air volume with the value actually measured in actual tests, and this difficulty is especially great for large machines. Therefore,
In the conventional salient pole rotor described above, a sufficient number of duct pieces 5 are fixed to the ventilation duct 4 of the rim 3 in order to give priority to reducing the temperature rise, thereby providing a sufficient amount of air volume. Therefore, in an actual test, when the amount of air passing through the salient pole portion was too large, the number of duct pieces 5 could not be reduced, and the amount of air became excessive, reducing the efficiency of the rotating electric machine. Particularly in large machines, the circumferential speed of the rotor is high, resulting in large windage losses, and the resulting reduction in efficiency has been a problem.

This idea allows multiple duct pieces to be inserted and removed in the radial direction in the circumferential direction into the ventilation duct part of the rim, and by adjusting the number of duct pieces installed, the air volume can be easily adjusted and optimized. It is an object of the present invention to provide a ventilation cooling device for a salient pole rotor that has a large air volume and improved efficiency.

3 and 4 are a longitudinal cross-sectional view and a partial plan cross-sectional view showing a ventilation cooling device for a salient pole rotor according to an embodiment of the invention;
is the same as the conventional device described above. Reference numeral 20 denotes a rim into which the rotor spider 2 is fixedly inserted, and a large number of insertion grooves 20a, each corresponding to a pair in the radial direction, are provided radially in the circumferential direction on both inner walls of the ventilation duct 4. Reference numeral 21 denotes a duct member which is inserted from the inner circumferential side into the pair of insertion grooves 20a on both sides, and has the same function as the conventional duct piece 5 described above. It is attached to the inner circumferential surface of 20 by bolts 23, and is detachable.

In the device of the above embodiment, the cooling air that enters the inner diameter side of the rotor spider 2 due to the rotation of the rotor passes through the ventilation duct 4 as shown by arrow D, and is pressurized by the fan action of the duct member 21. It flows through the space between adjacent field coils 11 as shown by arrow E. Further, the circulation of cooling air by the fan 12 is the same as in the conventional device described above.

In this way, most of the cooling air flows through the ventilation duct 4 of the rim 20, and the air volume in this portion is increased or decreased depending on the number of duct members 21. The duct member 21 can be easily attached and detached from the inner circumferential side of the rim 20, and if the temperature rise in the straight portions of the field coil 11 and stator coil is too small in the actual test, the duct member 21 in the 4 parts of the ventilation duct is excessively large. The air volume can be reduced by removing the number. Moreover, if the temperature rise is excessive, the duct member 21 can be inserted into the insertion groove 20a into which the duct member 21 is not inserted, thereby increasing the air volume.

In this way, a large number of duct members 21 can be easily attached and detached, and an appropriate number of duct members 21 can be removed within the allowable temperature rise range to reduce the air volume and windage loss.

As described above, according to this invention, a plurality of duct members are radially inserted into the ventilation duct part of the rim and detachably attached, making it easy to determine the number of duct members for the required air volume in actual tests. can be adjusted to enable more efficient operation.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing a conventional ventilation cooling device for a salient pole rotor, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a salient pole rotor according to an embodiment of this invention. Vertical cross-sectional view showing the ventilation cooling device for the child, No. 4
The figure is a sectional view taken along the - line in FIG. 3. 4...Ventilation duct, 9...Magnetic pole iron core, 11...
Field coil, 20... rim, 20a... insertion groove, 21... duct member. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] a rotor spider fixed to a rotating shaft; a rim to which the rotor spider is fixed so that torque from the rotating shaft is transmitted; and a rim that serves as a yoke for the rotor and is provided with a radial ventilation duct; a plurality of field cores equipped with field coils and attached to the outer periphery of the rim; a pair of insertion grooves on both sides provided radially at multiple locations on both corresponding inner walls of the ventilation duct portion of the rim; The rim is inserted into the insertion groove for each pair from the inner circumferential side, the lower mounting part is received in contact with the inner circumferential surface of the rim, and is attached with a bolt, and the fan action is performed by the rotation of the rotor. A ventilation cooling device for a salient pole rotor, which is equipped with a plurality of duct members and allows the amount of cooling air to be adjusted to an appropriate amount by adjusting the number of duct members installed.