JPS6281956A - Brushless synchronous machine - Google Patents

Abstract

PURPOSE:To shorten overall length in the axial direction by scaling up a rotor of a main body in the radial direction, mounting the rotor to a common shaft while being supported by a rotor center having a U-shaped section and disposing an exciter into the internal space of the rotor center. CONSTITUTION:A stator 12 for a main body is fitted through an axial stator radially mounted inside a cylindrical frame 11, and a common shaft 16 to which a rotor 13 surrounded by the stator 12, a rotor 3 for an AC exciter 1, a rotary rectifier 4, a cooling fan 15, etc. are set up in common is supported rotatably to both end surfaces of the frame 11 through a bracket 17. The rotors 12, 13 have large radial size and small axial size. The rotor 13 is mounted supported by a rotor center 18 having a U-shaped section to the common shaft 16, and the exciter 1 is disposed in the internal space of the rotor center 18.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] Generators mounted on vehicles such as trucks have severe limitations on external dimensions. .

The present invention relates to a brushless synchronous machine in which the rotors, rotary rectifiers, cooling fans, etc. of the main body and AC exciter are arranged on a common shaft, and the total length in the axial direction can be shortened.

[Prior art and its problems]

=do 5: , + , -f El 111
11den 111! fl' group 1. = ノ+'
i Q lr/l 1. = =q= -to To ^, the rotor 2.3 of the main body and the AC exciter l, the rotary rectifier 4, the cooling fan 5, etc. were arranged side by side on the common shaft 6, so the total length in the axial direction was long. Not only that, but in order to reduce the deflection of the common shaft 6, it is necessary to increase the diameter, which has the disadvantage of being expensive.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide a brushless synchronous machine whose total length in the axial direction can be shortened.

[Key points of the invention]

In order to achieve the above object, the present invention has the rotor of the main body enlarged in the radial direction, supported and mounted on a common shaft by a rotor center having a U-shaped cross section, and an exciter installed in the inner space of the rotor center. It was designed so that the

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention, and the same parts as in FIG. 2 are denoted by the same reference numerals. In this figure, 1
．． A stator (field) 12 of the main body is attached to the bottom of the J-shaped frame 11 via axial stays 11a provided radially, and a rotor (armature) 1 is surrounded by the stator 12.
3. A common shaft 16 on which the rotor 3, rotary rectifier 4, cooling fan 15, etc. of the AC exciter 1 are mounted in a common housing is rotatably supported on both end faces of the frame 11 via brackets 17 and brackets not shown. ing. The stator 12 and rotor 13 have larger radial dimensions than those described in the conventional example, and therefore smaller axial dimensions. The rotor 13 is supported and attached to the common shaft 16 by a rotor center 18 having a U-shaped cross section, and
is arranged in the inner space of the rotor center 18. The stator 19 of this exciter 1 is supported on the inner surface of the above-mentioned gracula 17 via a plurality of axial support arms 20.
A rotary rectifying device 4 is provided inside. The cooling fan 15 is disposed on the opposite side of the rotor center 18 from the exciter 1, and is configured to suck air from the outer circumference of the stator 12 and discharge it in the radial direction.

The stator 12 and the rotor 13 are provided with radial air ducts 21 and 22 at appropriate positions in the axial direction so as to communicate with each other. A plurality of long holes 18b are provided in the circumferential direction to communicate with the air duct 4 and provide ventilation. A ventilable space is provided in the axial direction between the cylindrical portion 18a of the rotor center 18 and the outer periphery of the excitation Jdlt1. An intake port flb and an exhaust port IC are provided on the outer periphery of both ends of the frame 11, and a stator 12 is provided on the inner periphery on the exhaust port 11c side.
An annular air guide 23 surrounding the end face of the air guide is integrally attached. The bracket 17 has a two-part structure in the radial direction, and is removably connected to the two parts via an annular fixing plate 24 that commonly fixes the roots of a plurality of support arms 20. An intake port 25a is provided in the direction. The synchronous machine rotates, and the air intake ports 11b and 25 are opened by the fan action of the cooling fan 15 and the air duct 22.
Cooling air is sucked in from a and discharged from an exhaust port 11c. Part of the cooling air passes through the outer periphery of the stator 12 in the axial direction, and the other part passes through the outer periphery of the exciter 1, the long hole 18b of the rotor center 18, and the F-duct n121, and the cooling air passes through the stator 1.
2 and cools the inside of the synchronous machine. An annular space 2 is provided on the cooling fan 15 side of the rotor center 18 in order to reduce ventilation resistance at the intake section of the cooling fan 15.
6 is provided. The lead wire 27 of the rotor 13 is fixedly attached to the end face of the rotor center 18 with a clamp 28.
It is also connected to the rotary rectifying device 4 through an axial groove 16a provided on the outer periphery of the common shaft 16 across the cavity 26 for efficient cooling.

An annular end plate lid on the cooling fan 15 side of the frame 11
Annular flange 2 to which a bracket (not shown) is attached
9 is attached to the mouth, rotor 13 and cooling fan 15
has an outer diameter slightly smaller than the inner diameters of the flange 29, air guide 23, and stator 12.

Therefore, it is possible to remove the flange 29 from the end plate ld and disconnect the outer split bracket 25 and the fixing plate 24 of the support arm 20 by pulling it out to the fan 15 side.
1 and bracket 17, the bracket 17 will be reversed.
It can be pulled out to the side. Furthermore, the rotary rectifier 4
Since the outer diameter of the stator 19 of the exciter 1 is smaller than the inner diameter of the stator 19 of the exciter 1, by uncoupling the inner split bracket 30 and the inner bearing cover 31, the stator 19 of the exciter 1 can be moved together with the split bracket 30 into the rotating part. It can be removed in the axial direction).

According to the embodiment, the total axial length of the exciter 1, the stator 12, and the rotor 13 is reduced by the smaller axial dimensions, and the common shaft 16 is thereby shortened without increasing the diameter.
It is possible to increase the mechanical strength of the material and reduce its deflection.
Furthermore, assembly work can be performed easily.

〔Effect of the invention〕

According to this invention, in a brushless synchronous machine, the rotor of the main body is enlarged in the radial direction and supported and mounted on a common shaft by a rotor center having a U-shaped cross section, and an exciter is arranged in the inner space of the rotor center. The effect is that the mechanical strength of the common shaft can be increased without increasing the diameter.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of an embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view of a main part of a conventional example. 1... Exciter, 3.13... Rotor, 4... Rotating rectifier, 15... Cooling fan, 16... Common shaft,
18...Rotor center. Figure 1

Claims (1)

[Claims] 1) In a brushless synchronous machine in which the rotors of the main body and the AC exciter, rotary rectifier, cooling fan, etc. are arranged on a common shaft, the rotor of the main body is enlarged in the radial direction and the rotor of the main body is enlarged in the radial direction to form a U-shape on the common shaft. A brushless synchronous machine characterized in that the exciter is supported and mounted on a rotor center having a cross section, and the exciter is disposed in an inner space of the rotor center.