JPS63299730A - Rotor of rotary electric machine - Google Patents

Abstract

PURPOSE:To improve the cooling property of a coil section by forming a vent passage along the edge face of a core of a section surrounded by the edge face of a rotor core and the inside of a semicircular rotor coil. CONSTITUTION:A guide plate 19 in which holes 18 to become vent passages are radially formed from the center of a rotor is disposed between the innermost side of a semicircular coil 11a and the axial end face of a rotor core 9. Cutouts 21 are formed as inlet/outlet at a core retainer 12 and a core 9 of the inlet/ output of the passage 18 (holes 18). Since a cylindrical rotor 1 formed in this manner is cooled at the interior of the resin section of the coil 11a by cooling air 5, the cooling property of this section is improved to obtain substantially similar temperature rising performance to the other section of a rotor coil 11.

Description

[Detailed description of the invention] [Object of the invention 1 (Industrial application field) The present invention relates to ventilation cooling of a rotor of a rotating electric machine.

(Prior Art) The structure of a rotor of a conventional rotating electric machine will be explained based on drawings.

FIG. 11 is a cross-sectional view of the general structure of a conventional rotating electrical machine. 0 The rotor 1 is supported by a bearing 3°3 fitted in the frame 2 and rotates. 9 The rotor 1 and stator 4 generate heat during operation. The temperature rise caused by this is achieved by drawing cooling air 5 into the machine by a fan 8 installed on the rotor shaft, passing this air through the gap 6 between the rotor 1 and stator 4 and the air hole 7 in the iron core, and discharging the heat to the outside. It is cooled down. FIG. 12 is an enlarged detailed view showing the sideways of the cylindrical rotor 1, with the coils 11 (
The semicircular coils 11a at both end portions of the coil 11, in which the coils 11 (FIG. 14) are accommodated and protrude from the core end face across the slots, are located outside the core holder 12. is surrounded by a coil presser 13 and a binding wire 14. Generally, this part is filled with a resin 15 and integrated to maintain insulation, mechanical strength, and heat transfer.

The heat generated by the coil 11 during operation is transferred through the iron core, and is cooled by the cooling air 5 that passes through the gap 6 between the rotor 1 and stator 4 and the air holes 7, thereby preventing the temperature of the coil 11 from rising. .

(Problem to be solved by the invention) However, in this type of cylindrical rotor, the semicircular coil lla that protrudes outside the iron core is only thermally transferred and dissipated through the filled resin, and moreover, the overall Since it is compacted, its surface area is small, so heat dissipation is small, and it is less likely to be cooled than other parts. Therefore, in order to meet the recent needs for smaller size and larger capacity, it is necessary to suppress the temperature rise in this part.The present invention thus improves the cooling performance of the coil part outside the core of the cylindrical rotor. It is an attempt to reform the .

[Structure 1 of the invention (Means for solving the problem) In FIG. A ventilation passage 18 is configured, which communicates with the iron core air hole 7 and whose tip opens to the outside of the stator iron core.

(Function) Cooling air is introduced from the air holes 7 into the ventilation passage 18, thereby increasing the amount of heat dissipation from the semicircular coil and reducing its temperature rise.

(Example) FIG. 1 shows an embodiment of the present invention.

Since the rotor coils 11 are arranged according to the magnetic poles,
The ventilation passages to be provided will also have the same number of poles and the same arrangement as the magnetic poles.

Here, the case of four poles will be explained.

A guide plate 19 (FIG. 4) in which holes 18 serving as ventilation passages are provided radially from the rotor center is arranged between the innermost part of the semicircular coil 11a and the axial end surface of the rotor core 9. A notch is provided in each of the core holder 12 and the core 9, which correspond to the entrance and exit of the ventilation passage 18 (hole 18), as an entrance and exit.

These notches are provided with an opening 17 in the radial direction in the case of the core holder 12, and in the case of the core 9, which is a stack of punched plates 20 (FIG. 2). iron core 9
The outlet is formed by providing cutouts 21 (FIG. 6) in only the number of punched plates at both ends corresponding to the diameter of the ventilation path (the size of the hole 18). In this way, the ventilation passage 18
is configured such that the cooling air 5 flows through the air holes as shown by the arrows in the figure.
Passes through the ventilation path and the outer periphery of the iron core.

7, 8, and 10 show other embodiments of the present invention. In FIG. 7, the guide plate 19 in FIG. 4 is divided and provided only for each ventilation passage 18. It is a figure of the division|segmentation guide plate in case. The one shown in FIG. 8 has one or more punched plates 20a having the cutouts 21 shown in FIG. The punched plate 20b between the holes is provided with air holes ya as shown in FIG.
ventilation.

FIG. 10 shows a structure in which the cooling air 5 shown in FIG. 1 is allowed to flow through the air hole 7a to the leeward side.

[Effect of the invention] In the cylindrical rotor configured in this way, the cooling air cools the inside of the resin part of the cylindrical coil, so the cooling performance of this part is improved and is almost the same as other parts of the rotor coil. The temperature rise performance is obtained, and the coil part

[Brief explanation of the drawing]

FIG. 1 is a detailed sectional view of a cylindrical rotor according to the present invention;
The figure is a view in the direction of the ■ arrow in Figure 1, Figure 3 is a punched plate of the rotor,
The figure is a front view of the guide plate for the ventilation passage according to the present invention, FIG. 5 is a sectional view taken along the line V-V in FIG. 4, FIG. 8 is a front view of a guide plate according to another embodiment of the present invention, and FIG. 8 is a front view of a guide plate according to another embodiment of the present invention.
9 is a front view of the punched plate in FIG. 8, FIG. 10 is a diagram equivalent to FIG. 1 of still another embodiment of the present invention, and FIG. 11 is a schematic sectional view of a conventional rotating electrical machine. Fig. 12 is an enlarged detailed view of the main part of Fig. 11, Fig. 13 is a view in the direction of arrow A in Fig. 12, and Fig. 14
The figure is an enlarged perspective view of the main part of FIG. 13. 1... Cylindrical rotor 4... Stator 5... Cooling air 6... Gap, 7... Air hole 9... Iron core 1
0... Slot 11... Coil 11A... Semicircular coil 15... Resin 18... Ventilation path (hole) 1
9... Guide plate 20... Cutout board 21... Notch.

Claims (1)

[Claims] In a rotating electric machine having a cylindrical rotor, in which cooling air is cooled through air holes provided in the stator and rotor core, and a gap between the stator and rotor, the end face of the rotor core and the inside of the semicircular rotor coil are A rotor for a rotating electric machine, characterized in that a ventilation passage is provided along the core end face of a portion surrounded by , with one end opening toward the rotor center side and the other end opening toward the rotor outer periphery.