JPH0654486A - Rotary electrical equipment - Google Patents

Abstract

PURPOSE:To provide a rotary electrical equipment wherein the abrasion of a brush can be controlled, the state of abrasion of the brush can be confirmed, and the brush can be replaced easily. CONSTITUTION:In this equipment, a coil 22 is formed around a rotor shaft 24 and power is supplied to a rotor 20 which is rotatably installed in a casing 12, to a plurality of brush terminals 26a, 26b and 26c which are installed on the rotor shaft 24 and which are connected to a winding end of the coil 22, and to the coil 22. In the rotary electrical equipment 10 which is provided with a plurality of brushes 36a, 36b and 36c which can be brought into contact with the brush terminals 26a, 26b and 26c respectively for taking out power from the coil 22, the brush terminals 26a, 26b and 26c are located through an insulating material and are formed in the shape of a bar and they are concentric. These brush terminals are inserted coaxially with the rotor shaft 24 into an installation hole which is made in the center of the rotor shaft 24 in the axis direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine, and more particularly to a rotor formed by forming a coil on a rotor shaft, and a rotor rotatably provided in a casing and a coil provided on the rotor shaft. The present invention relates to a rotating electric machine that includes a plurality of brush terminals connected to the wire ends and a plurality of brushes that can be brought into contact with each brush terminal in order to supply power to or extract power from a coil.

[0002]

2. Description of the Related Art A conventional rotary electric machine will be described with reference to FIG. A rotor 102 includes a rotor shaft 104 and a coil 106 fixed to the rotor shaft 104.
When the rotating electric machine 100 is used as a motor, power is supplied to the coil 106, or when the rotating electric machine 100 is used as the generator 100, ring-shaped brush terminals 108 and 110 for extracting electric power from the coil 106 are provided with rotor shafts 104. It is fitted and fixed to the outer circumference of. The brush terminals 108 and 110 are connected to the winding ends of the coil 106, respectively. Brushes 112 and 114 are fixed at predetermined positions in the casing 116. Brush 11
2, 114 are coils 106 via electric wires 118, 120
The brush terminals 108 and 110 can be brought into contact with each other in order to feed power to or take out power from the coil 106. When the rotating electric machine 100 is used as a motor, the electric wire 11
The power supplied via 8, 120 is applied to the brushes 112, 1
14 to the brush terminals 108, 110, the coil 1
It flows to 06. Then, the coil 106 is magnetized, the magnetic force balance with the stator magnet 122 is lost, and the rotor 1
02 rotates around the rotor shaft 104. On the other hand, when the rotating electric machine 100 is used as a generator, the rotor 102 is rotated about the rotor shaft 104 by an appropriate means. Then, the magnetic force of the stator magnet 122 causes the coil 10
Inductive power is generated at 6. This induced power is brush terminal 1
08, 110. Brush terminals 108, 110
The induction power supplied to the electric wires can be taken out from the electric wires 118 and 120 via the brushes 112 and 114.

[0003]

However, the conventional rotary electric machine 100 described above has the following problems. Since the brush terminals 108 and 110 are fixed to the outer circumference of the rotor shaft 104, the length of the outer circumference of the brush terminals 108 and 110 exceeds the circumference of the rotor shaft 104. Therefore,
There is a problem that the brushes 112 and 114, which are constantly in contact with the brush terminals 108 and 110 having a relatively long outer circumference, are significantly worn. If the wear is significant, the brushes 112, 114
It is uneconomical because the replacement frequency is high. Further, in the case of the conventional example shown in FIG. 2, the brushes 112 and 114 are the casing 11
Since it is located inside 6, it is not possible to accurately know the replacement time of the brushes 112 and 114 because the degree of wear cannot be visually recognized. Further, it is necessary to disassemble the brushes 112 and 114 even when the brushes 112 and 114 are replaced, which causes a problem that the work becomes complicated. Therefore, it is an object of the present invention to provide a rotating electric machine capable of suppressing the abrasion of the brush, confirming the abrasion state of the brush, and facilitating the replacement work of the brush.

[0004]

In order to solve the above problems, the present invention has the following constitution. That is, while forming a coil on a rotor shaft, the rotor is rotatably provided in a casing, a plurality of brush terminals provided on the rotor shaft and connected to winding end portions of the coil, In a rotary electric machine comprising a plurality of brushes capable of contacting each of the brush terminals in order to feed power to the coil or extract power from the coil, the plurality of brush terminals are formed in a concentric rod shape with insulating means interposed therebetween. In addition, it is characterized in that it is fitted coaxially with the rotor shaft into an attachment hole formed in the center of the rotor shaft in the axial direction. In particular, the plurality of concentric rod-shaped brush terminals are fitted into one end surface side of the rotor shaft, and the brush terminals located inside are exposed to the outside of the adjacent brush terminals outside. Alternatively, the brush terminals may be located outside the casing, and the plurality of brushes may be located outside the casing.

[0005]

[Operation] The operation will be described. Multiple brush terminals
The brush terminals are formed into concentric rods through insulating means and are fitted coaxially with the rotor shaft into a mounting hole formed in the center of the rotor shaft in the axial direction. It can be made shorter than the length of the outer circumference of the shaft.
Further, when the brush terminals are located outside the casing and the plurality of brushes are also located outside the casing, the brushes can be directly viewed and exchanged without removing the casing.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. In FIG. 1, reference numeral 12 is a casing, which is made of a magnetic material (for example, iron). For example, the casing 12 is formed into a single cylindrical body by combining a pair of semi-cylindrical casing components. Through holes 14 and 16 are provided at the centers of both end surfaces of the casing 12. Reference numeral 18 denotes a stator magnet, which is the casing 12
2N (N is a natural number) are provided on the inner peripheral surface of the. The stator magnets 18 are arranged side by side in the circumferential direction alternately with N and S poles.

Reference numeral 20 denotes a rotor, which comprises a coil 22 and a rotor shaft 24 which is inserted along the axis of the coil 22. The rotor 20 is housed in the casing 12, and both ends of the rotor shaft 24 are rotatably supported by bearings 26 arranged in the casing 12. The left end portion of the rotor shaft 24 projects outward from the through hole 14 and the left end surface is exposed. The coil 22 is formed by winding a conductive wire, and 2N (N is a natural number) magnetic pole portions (not shown) are formed in the circumferential direction. The 2N magnetic pole portions face the plurality of stator magnets 18.

Reference numerals 26a, 26b and 26c are brush terminals, which are made of a conductive material (eg, copper). The rod-shaped brush terminal 26a and the cylindrical brush terminals 26b and 26c
Are formed in a concentric rod shape with an insulating film (not shown) in between. The brush terminals 26a, 26b, and 26c have mounting holes 28 formed in the center of the rotor shaft 24 in the axial direction.
Is fitted and fixed coaxially with the rotor shaft 24. An insulating layer 30 is formed between the brush terminals 26a, 26c and the rotor shaft 24 in order to electrically insulate them from each other. The left ends of the brush terminals 26a, 26b, 26c project from the left end surface of the rotor shaft 24 and are located outside the casing. Further, the brush terminal 26
At the left end of each of a, 26b, and 26c, the brush terminal 26a projects most, and the outer brush terminal 26c projects least. That is, the brush terminals located inside are exposed to the outside from the adjacent brush terminals outside.

Each brush terminal 26a, 26b, 26c is electrically connected to the coil 22 winding through a conductive wire 32. The conductive wire 32 is connected via a radial hole 34 that connects the outer periphery of the rotor shaft 24 and the mounting hole 28. By passing through the radial holes 34, the conductive wire 32 does not entangle with the outer circumference of the rotor shaft 24 even when the rotor 20 rotates. 36a, 36b, 36c are brushes, for example, carbon brushes are used. Brushes 36a, 36
b and 36c are attached to the outside of the casing 12. The brushes 36a, 36b, 36c are arranged at positions capable of contacting the corresponding brush terminals 26a, 26b, 26c in order to supply power to the coil 22 or extract power from the coil 22.

When the rotary electric machine 10 thus constructed is used as a motor, the electric power supplied through the electric wire 38 is supplied from the brushes 36a, 36b, 36c to the brush terminal 26.
a, 26b, 26c, and flows to the coil 22. Then, the coil 22 is magnetized, the magnetic force balance with the stator magnet 18 is lost, and the rotor 20 rotates about the rotor shaft 24. On the other hand, when the rotating electric machine 10 is used as a generator, the rotor 20 is rotated about the rotor shaft 24 by an appropriate means. Then, an induction power is generated in the coil 22 by the magnetic force of the stator magnet 18. This induced power is supplied to the brush terminals 26a, 26b, 26c.
The induction power supplied to the brush terminals 26a, 26b, 26c can be taken out from the electric wire 38 via the brushes 36a, 36b, 36c.

In the rotary electric machine 10 of the present embodiment, the brush terminals 26a, 26b, 26c are formed into concentric rods with insulating films interposed therebetween, and the rotor shaft 24
Since it is fitted and fixed coaxially with the rotor shaft 24 in a mounting hole 28 formed at the center of the brush terminals 26a, 26
The outer peripheral lengths of b and 26c can be made shorter than the outer peripheral length of the rotor shaft 24. Therefore, the contact amount (contact distance) of the brushes 36a, 36b, 36c that are in constant contact can be suppressed, the wear amount of the brushes 36a, 36b, 36c can be suppressed, and the replacement frequency of the brushes 36a, 36b, 36c can be reduced. It can be lowered and is economical. Further, the brush terminals 26a, 26b, 26c and the brushes 36a, 36b, 3
Since 6c is located outside the casing 12, the brushes 36a, 36b, 36c can be directly visually recognized, and the wear state can be immediately grasped. Further, the brush terminals 26a, 26b, 26c and the brushes 36a, 36
Even when replacing b and 36c, the casing 12
Can be done without removing.

In this embodiment, the brush terminals 26a, 2
6b, 26c and the brushes 36a, 36b, 36c are positioned outside the casing 12, but when the diameter of the rotor shaft 24 is large, the concentric brush terminals 26a, 26b, 26 are formed.
In c, it is not always necessary that the brush terminals located inside are exposed to the outside of the adjacent brush terminals outside. The end faces of the plurality of brush terminals may be flush with each other as long as the brushes can contact the brush terminals without short-circuiting. Further, the mounting positions of the plurality of brush terminals may be provided not in the end surface of the rotor shaft but in the middle of the rotor shaft. Further, the brush or the like may be provided in the casing unless the labor of replacing the brush or the like is taken into consideration. Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. .

[0013]

When the rotating electric machine according to the present invention is used, the brush terminals are formed in the shape of concentric rods with the insulating means interposed therebetween, and the brush terminals are coaxial with the rotor shaft to the mounting hole formed at the center of the rotor shaft. The outer peripheral length of the brush terminal can be made shorter than the outer peripheral length of the rotor shaft. Therefore, the contact amount (contact distance) of the brush that is constantly in contact can be suppressed, the amount of abrasion of the brush can be suppressed, and the replacement frequency of the brush can be reduced, which is economical. Further, since the brush terminal and the brush are located outside the casing, the brush can be directly visually recognized and the wear state can be immediately grasped. Furthermore, since the brush terminal and the brush can be exchanged without removing the casing as in the conventional case, the workability can be improved and the like.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a rotating electric machine according to the present invention.

FIG. 2 is a cross-sectional view of a conventional rotating electric machine.

[Explanation of symbols]

 10 Rotating Electric Machine 12 Casing 20 Rotor 22 Coil 24 Rotor Shaft 26a, 26b, 26c Brush Terminal 28 Mounting Hole 36a, 36b, 36c Brush

Claims (3)

[Claims] 1. A rotor formed by forming a coil on a rotor shaft and rotatably provided in a casing, and a plurality of brush terminals provided on the rotor shaft and connected to winding end portions of the coil. And a plurality of brushes capable of contacting each of the brush terminals in order to feed power to the coil or to extract power from the coil, wherein the plurality of brush terminals are concentric rod-shaped via insulating means. The rotating electric machine, which is formed on the center of the rotor shaft and is fitted coaxially with the rotor shaft in a mounting hole formed in the center of the rotor shaft in the axial direction. 2. The plurality of concentric rod-shaped brush terminals are fitted into one end face side of the rotor shaft, and the brush terminals located inside are exposed to the outside of the adjacent outer brush terminals. The rotating electrical machine according to claim 1, wherein: 3. The rotating electric machine according to claim 2, wherein the brush terminals are located outside the casing, and the plurality of brushes are also located outside the casing.