JPS5923177B2 - Brushless rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brushless rotating electrical machine with an improved mounting structure for a rotating rectifier.

Conventional brushless rotating electric machines employ an excitation method in which the output of an AC exciter is rectified by a rectifier mounted on the shaft of the AC exciter via a rectifier support ring, and then supplied to a field winding.

FIG. 5 shows the configuration of a conventionally known brushless excitation device.

In FIG. 5, 1 is an AC exciter placed and fixed on a base 2, and this AC exciter 1 has a stator 1a, and this stator 1
The rotor 1b is provided with an air gap in the rotor 1b, and a bearing pedestal 1d rotatably supports one end of a shaft 1c of the rotor 1b.

Further, 3 is a rectifier support ring mounted on the shaft 1c on the opposite side to the bearing stand 1d side, and 4 is this rectifier support ring 3.
5 is a fan installed on the shaft 1c between the rectifier support ring 3 and the rotor 1b, and 6 is a ventilation passage formed in the stator 1a for the fan 5. 7 is the shaft of a synchronous machine which is the main machine of the exciter connected to the shaft 1c, and 8 is the exciter housing.

Note that the illustrated arrow indicates the flow direction of the cooling air.

However, in such a brushless rotating electric machine, each rectifier element 4 is attached to the rectifier support ring 3.

There is no problem with cooling the rectifying element itself because it is supported by the rectifying element 4, but there are Since strong centrifugal force acts on it, it must be able to withstand this force.

Furthermore, when each rectifier element 4 is attached to the rectifier support ring 3, it is difficult to arrange and configure how to balance and support each rectifier element 4 against strong centrifugal force, and a high level of technology is required. In connection with this, maintenance such as replacing the rectifier becomes difficult.

The present invention has been made to solve the above-mentioned problems, and its purpose is to attach a cassette-type rectifier, in which a rectifying element and accessory parts forming a multi-phase rectifying circuit are housed in a case, to the rotating shaft of a rotating electric machine. By inserting the rectifier into the center hole so that it can be inserted and removed without losing the cooling effect, it is possible to extremely reduce the centrifugal force applied to the rectifier, and it is highly safe and easy to maintain and inspect. The purpose of the present invention is to provide a brushless rotating electric machine that can easily perform the following operations.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 10 denotes a generator, and this generator 10 is composed of a stator 12 attached to a frame 11 and a rotor 14 attached to a rotating shaft 13.

Further, 20 is an AC exciter connected coaxially with the generator 10. Like the generator 10, this AC exciter 20 includes a stator 22 attached to a frame 21, and a rotor 24 attached to a rotating shaft 23. The output of this AC exciter 20 is rectified by a rectifier, which will be described later, and is supplied to a field winding provided on the rotor 14 of the generator 10.

As shown in FIGS. 2 and 3, the rotating shaft 23 of the AC exciter 20 is provided with a center hole 25, and a plurality of cooling holes 26 extending radially from the center hole 25 to the outside of the shaft. There are places set up.

An excitation terminal 27 on the generator side and an output terminal 28 on the AC exciter side are respectively attached to the inner peripheral surface of the center hole 25 of the rotating shaft 23.

On the other hand, 29 is a cassette type rectifier, and this rectifier 29 has rectifying elements 31 and fuses 32 corresponding to each of the three phases in a cylindrical body 30 having a diameter that can be inserted into the center hole 25 of the rotating shaft 23. A lid body 34 is provided at one opening of the cylindrical body 30, which sinks into the cylindrical body 30 when pressed against the elastic force of the spring 33, and a lid body 34 is provided at the other opening. A handle 36 is attached to a closure body 35 that closes the section.

A plurality of ventilation holes 37 of appropriate area are provided on the circumferential surface of the cylindrical body 30, passing through the inside and outside of the cylinder. Grooves 38 and 39 are formed on the circumferential surface of the cylindrical body 30.

, such a cassette-shaped rectifier 29 is inserted into the center hole 25 of the rotating shaft 23 by grasping the handle 36, and after the lid body 34 contacts the bottom of the center hole 25, it is further pressed against the elastic force of the spring 33. By twisting the terminals together, the output terminals 28 on the AC exciter side and the excitation terminals 27 on the generator side are slid into the trace grooves 39, 3B and fixed.

Therefore, the input/output terminals of the rectifier circuit including the rectifying element 31 and the fuse 32 are electrically connected to the output terminal 28 and the excitation terminal 27.

FIG. 4 shows a circuit connection in which the output of the AC exciter 20 is rectified by a cassette rectifier 29 consisting of a rectifying element 31 and a fuse 32 and supplied to the excitation terminal 27 of the generator 10.

In this way, in the present invention, the cassette-type rectifier 29 containing the rectifier elements 31 and fuses 32 corresponding to each phase of the three-phase AC is inserted and fixed in the center hole 25 provided in the rotating shaft 23 of the AC exciter 20. By doing so, the centrifugal force applied to the rectifier 29 during rotation can be extremely reduced, safety is high, and maintenance and inspection are facilitated.

Furthermore, the rotating shaft 23 is provided with a radial ventilation hole 26, and the rectifier 29 itself is also provided with a ventilation hole with an appropriate area, so that cooling of the rectifier 29 and the inside of the rectifier can be effectively performed. can.

Furthermore, by fitting the output terminal 28 of the AC exciter 20 and the excitation terminal 27 of the generator 10 into the grooves 39 and 38, they are connected to the input and output terminals of the rectifier 29, so that the connection between both terminals is possible. Contact resistance is low, and current characteristics in this part can be improved.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without changing the gist thereof.

As described above, according to the present invention, the cooling effect of the cassette rectifier, in which the rectifying elements forming a multi-phase rectifying circuit and accessory parts are housed in the case, is placed in the center hole provided in the rotating shaft of the rotating electrical machine. Since the brushless rotating electric machine is inserted removably without being exposed to the brush, the influence of centrifugal force can be reduced as much as possible, and a brushless rotating electrical machine can be provided which is highly safe and easy to perform maintenance and inspection.

[Brief Description of the Drawings] Fig. 1 is a half-sectional view showing a schematic configuration of an embodiment of a brushless rotating electric machine according to the present invention, and Fig. 2 shows a rotating shaft and a center hole of the rotating shaft inserted in the same embodiment. 3 is a sectional view showing the configuration of the cassette rectifier shown in FIG. 2, and FIG. 4 is a sectional view of the rotating shaft and cassette rectifier shown in FIG. A circuit connection diagram between a cassette rectifier and its input/output terminals in the embodiment, and FIG. 5 is a longitudinal sectional view showing the configuration of a conventional brushless excitation device. 10... Generator, 20... AC exciter, 23... Rotating shaft, 25... Center hole,
26... Cooling hole, 27... Excitation terminal,
28...Output terminal, 29...Cassette rectifier, 30...Cylindrical body, 31...
Rectifying element, 32... Fuse, 33...
・Spring, 34... Lid body, 35...
- Closure body, 36...handle, 37...ventilation opening, 38, 39...profile groove.

Claims (1)

[Claims] 1 In a brushless rotating electric machine equipped with a rotating rectifier,
The rectifier elements and accessories corresponding to each phase are connected in a specified manner to form a multi-phase rectifier circuit, and installed inside the case, and a plurality of ventilation holes are provided on the circumference of the case, penetrating the inside and outside. A cassette-type rectifier is formed by providing a groove at a predetermined location on the outer circumferential surface of the case and connecting the input/output terminals of the rectifier circuit to this groove portion. The configuration is such that it can be inserted,
The rotary shaft is provided with a plurality of ventilation holes extending from the outer peripheral surface of the shaft into the center hole, and an AC input terminal and a DC input terminal are provided on the inner peripheral surface of the center hole at locations corresponding to the input/output terminals of the rectifier circuit. Attach the output terminal and turn the cassette-shaped rectifier inserted into the center hole, so that the AC input terminal and the DC output terminal fit into the groove, and are connected to the input/output terminal of the rectifier circuit and fixed. A brushless rotating electric machine characterized by a smooth structure.