JPS59106858A - Brush wear detector - Google Patents

Abstract

PURPOSE:To maintain a brush without a large quantity of time by providing a transmitter which communicates a signal with a receiver when a brush reaches its wear limit. CONSTITUTION:A light signal is interrupted by a brush 1 in the state that a brush 1 is not worn, and a light is not communicated between a transmitter 7 and a receiver 8. When the brush 1 is worn, the interrupted state of the light signal is released, the light signal is communicated between the transmitter 7 and the receiver 8, an alarm unit such as a buzzer or a lamp is operated to discriminate that the brush 1 reaches the wear limit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brush wear detection device which is used in a rotating electric machine and has a brush holder that uses a constant pressure plate spring, for example.

Conventionally, devices of this type have been shown in Figures 1 to 3. In each of these figures, (1 nonipurasi, +2
1tI:LThis is a brush holder that presses this brush 1llk.As an example in the figure, a constant pressure leaf spring (3
) and a spring support (4) that supports this constant pressure leaf spring (3). (51 is a brush holder that holds the brush +11 and also holds the brush (2) a brush holder that fully supports the brush +11;
Reference numeral 61 indicates a commutator surface of a rotor (not shown).

Next, the operation will be explained. The commutator surface (6
) is pressed against the commutator surface (0) and the brush (1
), the current is extracted to the outside through a pigtail (not shown), or conversely, the current is taken in from the outside.

However, in the conventional device configured as described above, it is difficult to detect the state in which the brush (port) is worn beyond the wear limit, and therefore, daily inspections are required to prevent flashover accidents caused by transient separation of the brush +11. At times, it was necessary to measure the number of brushes on a large rotating electric machine using a scale or a caliper on the wear cover of B'x 7, brushes (11). Since there are 500 to 800 brushes, it takes a lot of time to maintain the brushes.Also, in some cases, flashover accidents due to transient wear of the brushes [11] may occur. This was developed in view of the shortcomings of conventional methods, and the present invention provides a brush wear detection device that electrically detects the wear state of brushes, thereby eliminating the need for a large amount of time for brush maintenance. .

An embodiment of the present invention will be described below with reference to FIGS. 4 to 6. In each of these figures, Il+ or 6
) is similar to the configuration of the conventional device described above.

(7) is the injury device installed in the brush holder (2), (8)
is a transmitter that is provided at a position corresponding to the wear limit of the brush fl+ of the brush holder (5), and exchanges, for example, an original signal with the receiver (7) when the brush il+ reaches the wear limit. be.

Next, the operation will be explained. As shown in Fig. 4, the brush +11 is not worn out, and in this state, the brush +11 is not worn! The optical signal is cut off and the receiver (7)
It can be determined that the brush +11 has not reached its wear limit since the original signal is not exchanged between the brush +11 and the transmitter (8).

Brush fl+ until brush il+ is worn out as shown in FIG.
When the optical signal is worn out, the cut-off state of the optical signal is released, and the original signal is exchanged between the receiver (7) and the transmitter (8).
For example, a notification device (not shown) such as a buzzer or a lamp is operated to determine that the brush il+ has reached its wear limit. Is this the wear limit for brush +11? It can be easily determined electrically, and there is no need to remove the brush from the brush holder (5) and measure the wear amount of the brush with a scale or caliper during daily inspections, as in the past. (1) Maintenance can be performed without requiring 1'dl' when the total amount of maintenance is large. Furthermore, there is no risk of financial problems such as flashover accidents due to transient wear of the brush il+.

In the above embodiment, the case where the receiver (7) and the transmitter (8) send and receive optical signals is described, but radio signals,
It is also conceivable to carry out all transfers of laser No. 46, etc.

In addition, although the above embodiment has been described in which the brush holder uses all the foot pressure plate springs, this invention can be applied to other brush holders that are fully equipped, and the same effects as in the above embodiment can be achieved. As explained above, when there is a receiver noise mark on the brush holder and the brush holder reaches the wear limit, signals are exchanged with the receiver. Since the metal film is removed, the state of wear on the J handle of the brush can be detected electrically, and maintenance of the brush can be carried out without having to completely install it for a long time.

[Brief explanation of the drawing]

1 and 2 are a front view and a plan view showing a conventional brush wear detection device, FIG. 3 is a front view showing a conventional brush wear limit state, and FIGS. 4 and 5 are an embodiment of the present invention. Brush wear detection device according to example front view and top view, No. 6
The figure is a front view showing the brush wear limit state of an embodiment of the present invention. In the figure, +i+rc brush, (2) brush holder,
(6) is a brush holder, (7) is a receiver, and (8) is a transmitter. In addition, the same reference numerals in the figures indicate the same text (Minister of Industry Sho 11). Agent: Tsuyoshi Kuzuno - Figure 1 Figure 3 Figure 4 Figure 6

Claims (1)

[Claims] [11] A brush holder for holding a brush, a brush holder for holding the brush, a receiver provided on the brush holder,
Brush wear characterized by comprising a transmitter provided in the brush holder at a position corresponding to the wear limit of the brush, and transmitting and receiving signals to and from the receiver when the brush reaches the wear limit. Detection device. (2) The brush wear detection device according to claim 1, characterized in that the transmitter and the receiver transmit and receive original signals.