JPH04334949A - Brush wear detector, brush wear indicator and rectifier protecting device - Google Patents

Abstract

PURPOSE:To effectively detect wear of a brush at a suitable time, to easily recognize the wear of the brush and to prevent an increase in damage of a commutator due to the wear of the brush. CONSTITUTION:An insulating plate 5 is provided on the side of a brush holder 21, moving elements 8A (8B, 8C) passing through the plate 5 and the holder 21 are provided, movable side contacts 6A (6B, 6C) are respectively provided at the elements 8A (8B, 8C), and stationary side contacts 9A (9B, 9C) are provided at the plate 5. Signal lamps 11A (11B, 11C) connected to the stationary side contacts are provided at an indicator 2. Further, a time limit relay 12 connected to the contact 9C of a rectifier 14 side and a protective circuit 3 containing a relay 13 are provided to effectively detect wear of a brush at a suitable time, the wear is easily recognized, and an increase in damage of a commutator due to the wear can be prevented.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to rotating electric machines, and more particularly to a brush wear detection device, a brush wear display device, and a commutator protection device.

0003

[Prior Art] Conventionally, in rotating electric machines equipped with brushes, in order to prevent damage to the commutator surface due to excessive wear of the brushes, when the wear of the brushes reaches a permissible limit, the brush pressing springs become ineffective. Visual detection methods are used, such as placing marks on brushes and pigtails.

0004

However, in this brush wear detection method, in order to check the degree of wear of the brushes, it is necessary to frequently stop and check the rotating electric machine. This confirmation work is done by removing the inspection lid and visually inspecting it, and if it is close to the allowable limit, it is replaced, but it must be done within the limited maintenance inspection time, so there is no chance of accidentally damaging the brush when removing it. Not only is there a risk that the contact surface with the commutator surface may hit unevenly or the brush is inserted in the wrong direction, but if inspection is delayed due to neglect or forgetfulness, the commutator may become damaged. There is also a risk that the damage will progress and the repair range will increase, making maintenance time even longer.

[0005] Therefore, an object of the first invention is to obtain a brush wear detection device that can detect brush wear accurately and at an appropriate time, and a second object of the invention is to provide a brush wear detection device that can detect brush wear accurately and at an appropriate time. A third object of the invention is to obtain a brush wear display device that can be easily recognized by personnel.
To obtain a commutator protection device capable of preventing damage to a commutator even if maintenance and inspection are forgotten. [Structure of the invention]

[0006]

[Means for Solving the Problems] The first invention is a brush wear detection device that is attached to a brush holder and detects brush wear, in which an insulating plate is provided on the side surface of the brush holder and is fixed to the insulating plate. Brush wear detection characterized by providing a contact, a moving element having one side that penetrates the side surface of the brush holder and an insulating plate, the tip of which is pressed against the side surface of the brush, and the contact portion of the other side facing the fixed contact. It is a device.

A second aspect of the present invention is a brush wear display device comprising the brush wear detection device and a display section connected to the brush wear detection device.

Furthermore, a third aspect of the present invention is a commutator protection device comprising the brush wear display device and a protection circuit connected to the brush wear display device and operated in a time-limited manner.

[0009]

[Operation] As the brush wear progresses and the head of the brush passes the tip of the slider that presses the side of the brush, the slider moves toward the brush and comes into contact with the other side of the slider. contact the fixed contact. A display unit, one end of which is connected to this fixed contact, displays the progress of brush wear using a signal input via this stator, and a signal indicating the progress of brush wear is input via the display unit. The protection circuit stops the rotating electric machine depending on the degree of brush wear.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the brush wear detection device, brush wear display device, and commutator protection device of the present invention will be described below with reference to the drawings. Fig. 1 is a diagram showing a brush wear detection device, a brush wear display device, and a commutator protection device, and Fig. 2 is a diagram showing a brush wear detection device, a brush wear display device, and a commutator protection device.
FIG. 3 is a right side view of FIG. 2. FIG.

As shown in FIGS. 1 to 3, three through holes 4 are provided in the upper and lower sides of the brush holder 21 attached to the side surface of the brush holder support 22. A rectangular insulating plate 5 is attached. This insulating plate 5 is provided with a through hole 5a having the same diameter as the through hole 4 at a position that coincides with the through hole 4 provided in the brush holder 21, and these through holes 4 and 5a have a substantially L shape. The movers 8A, 8B, and 8C made of phosphor copper rods are inserted in order from the top, and the left ends of the movers 8A, 8B, and 8C are hemispherical. A tension spring 7 is attached between the right end of these movers 8A, 8B, 8C and the insulating plate 5 in FIG.
The brush holder 21 is pressed against the side surface of the brush 23 inside the brush holder 21 by the restoring force.

On the other hand, a fixed side contact 9 is provided on the surface of the insulating plate 5.
A, 9B, 9C are installed in order from the top, and the mover 8A
, 8B, 8C have fixed side contacts 9A, 9B, 9C.
Movable side contacts 6A, 6B, and 6C are attached to positions facing each other. The contact gaps between these fixed side contacts 8A, 8B, 8C and movable side contacts 6A, 6B, 6C are
The apex of the left hemisphere of A, 8B, 8C is the brush holder 2
It is set so that it comes into contact when it protrudes 0.5 to 1 mm from the inner surface of 1 (that is, the contact gap is about 0.75 mm). Furthermore, the distance from the commutator piece 14 to the through hole 4 into which the mover 8C is inserted is such that when the effective remaining length of the brush 23 is 3 mm, the movable contact 6C is connected to the fixed contact 9.
It is set to touch C.

Among these fixed side contacts 9A, 9B, 9C, one side of the lead wire 10A is attached to the fixed side contact 9A, and one side of the lead wire 10B is attached to the fixed side contact 9B.
C is connected to one side of the lead wire 10C, respectively. On the other hand, a signal light 11A with a resistor with a green globe is attached to the terminal box 18 of the rotating electric machine via an insulator (not shown), a signal light 11B with a resistor with an orange globe and a resistor with a red globe are attached to the terminal box 18 of the rotating electric machine. An attached signal light 11C is attached to form a display section 2.

Among these signal lamps, the other side of the lead wire 10A is connected to the external connection terminal of the resistor of the signal lamp 11A, the other side of the lead wire 10B is connected to the external connection terminal of the resistor of the signal lamp 11B, and the other side of the lead wire 10B is connected to the external connection terminal of the resistor of the signal lamp 11C. The other side of the lead wire 10C is connected to the external connection terminal of each of the signal lights 10A, 10B, and 10C, and the connection terminal on the other side of these signal lights 10A, 10B, and 10C is connected to the ground terminal of the rotating electric machine.

Next, one side of a lead wire 15 is connected to the connection point with the resistor of the signal light 11C, and the other side of this lead wire 15 is connected to the time limit of the protection circuit 3 provided in the central control unit 17, whose details are omitted. connected to the relay 12, this time-limited relay 1
The contact signal No. 2 is connected to a relay 13 connected to an emergency stop circuit of the rotating electric machine, and the time limit relay 12 is set to operate 1000 hours after the operation signal is input.

Now, in the brush wear detection section 1, display section 2, and protection circuit 3 configured as described above, the head of the brush 23 is damaged when the movable element 8A is inserted due to wear of the brush 23 during operation of the rotating electric machine. After passing through the center of the through hole 4, the movable element 8A is moved by the tension spring 7, projects inside the brush holder 21, and the movable contact 6A contacts the fixed contact 9A. Then, the signal light 11A lights up to indicate that the brush 23 has progressed to wear but does not need to be replaced.

Furthermore, when the wear of the brush 23 progresses and the head of the brush 23 passes the center of the through hole 4 into which the slider 8B is inserted, the slider 8B is pulled by the tension spring 7 and moves toward the movable side. The contact 6B contacts the fixed side contact 9B, and the signal light 11
B lights up to indicate that the replacement date for the brush 23 is approaching and that it is better to replace it on the next maintenance inspection date. From then on,
If you forget to replace the brush 23 and the wear of the brush 23 progresses, if the remaining usable length of the brush 23 is 3 mm, the movable contact 6C will move to the fixed contact 9 due to the movement of the mover 8C.
C, the signal light 11C lights up, indicating that the maintenance worker can prevent damage to the commutator 14 by stopping the rotating electrical machine within 1000 hours of operation of the rotating electrical machine. In addition, even if the rotating electrical machine is operated as it is, the operation of the relay 13 and the time-limited relay 12 will cause the
Since the rotating electric machine is stopped after 000 hours, damage to the commutator pieces 14 can also be prevented.

In the above embodiment, the display section 2 was explained as an example of a signal light with a glove, but it is a light emitting diode and displays characters such as green: not needed to be replaced, orange: ready for replacement, red: need to be replaced, etc. It may be displayed as , and furthermore, relay 13
A bell or a buzzer may be activated along with the operation. The display division of the signal light may be two divisions instead of three, or it may be one division. Furthermore, in the above embodiment, the effective remaining usable length of the brush 23 when the movable contact 6C of the movable element 8C contacts the fixed contact 9C is 3 mm, but the operating rate of the rotating electric machine, the material of the brush, It may be changed depending on the maintenance frequency, etc. Further, the display section 2 does not need to be a terminal box of the rotating electric machine, and may be provided in the central control device 17.

In this way, the mover attached to the brush holder operates sequentially depending on the degree of wear of the brush, and the information is displayed on the display section of the terminal box of the rotating electric machine. This not only eliminates the need for regular maintenance inspections such as investigating the marks placed on brushes and pigtails to detect the wear limit of brushes, as well as visual monitoring of the amount of wear, but also eliminates the need for inspection lids that occur during inspection work. This eliminates the need to attach and detach the brush from the brush holder, and prevents damage to the brush due to attachment and detachment from the brush holder, poor contact with the commutator surface,
Problems such as incorrect attachment can be solved. Furthermore, it is possible to reduce the number of maintenance personnel and maintenance time required to perform the above-mentioned work. Furthermore, if you forget to replace the product even after the set time has elapsed after the alarm display occurs, the time-limited relay in the protection circuit will operate, and the relay built into the protection circuit will operate to stop the rotating electrical machine. Damage to the commutator surface due to forgetting the replacement work can be prevented, and the life of the rotating electric machine can be extended.

[0020]

As described above, according to the first invention, in the brush wear detection device that is attached to a brush holder and detects brush wear, an insulating plate is provided on the side surface of the brush holder and is fixed to the insulating plate. By providing a contact point, and providing a mover with one side penetrating the side surface of the brush holder and the insulating plate, the tip of which is pressed against the side surface of the brush, and the contact portion of the other side opposed to the fixed contact, it is possible to Since the degree of wear of the brush is detected during the life of the brush, it is possible to obtain a brush wear detection device that can accurately and timely detect the wear of the brush.

Further, according to the second invention, by providing a display section that displays the signal detected by the brush wear detection device, the brush wear can be detected without the need for maintenance personnel to remove the inspection lid or the like for inspection. Since the degree can be checked accurately and at the right time,
It is possible to obtain a brush wear display device that allows the wear degree of the brush to be easily known.

Furthermore, according to the third invention, by providing a protection circuit in which the signal detected by the brush wear detection device is inputted via a time relay, it is possible to prevent the brush wear from exceeding the allowable limit due to the maintenance personnel's negligence. Since the rotating electric machine can be stopped even if it exceeds the limit, it is possible to obtain a commutator protection device that can prevent damage to the commutator and long-term operation stoppage of the rotating electric machine.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of a brush wear detection device of a first invention, a brush wear display device of a second invention, and a commutator protection device of a third invention.

FIG. 2 is a side view of the brush wear detection device of the first invention.

FIG. 3 is a right side view of FIG. 2.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Wear detection part, 2... Display part, 3... Protection circuit, 4... Through hole, 5... Insulating plate, 6A, 6B, 6C... Movable side contact, 7...
Tension spring, 8A, 8B, 8C... Mover, 9A, 9B,
9C...Fixed side contact, 10A, 10B, 10C...Lead wire, 11A, 11B, 11C...Signal lamp, 12...Time-limited relay, 13...Relay, 14...Commutator.

Claims (3)

[Claims] 1. A brush wear detection device that is attached to a brush holder and detects wear of the brush, wherein an insulating plate is provided on a side surface of the brush holder, a fixed contact is provided on the insulating plate, and one side is connected to the brush holder. A brush wear detection device characterized in that a mover is provided that penetrates a side surface of the brush and the insulating plate, a tip thereof is pressed against the side surface of the brush, and a contact portion on the other side faces the fixed contact. 2. A brush wear display device comprising the brush wear detection device according to claim 1 and a display section connected to the brush wear detection device. 3. A commutator protection device comprising the brush wear indicator according to claim 2 and a protection circuit connected to the brush wear indicator and operated in a time-limited manner.