| 摘要 |
PURPOSE:To facilitate the exchange of a brush providing remotely a displacement detector from an electromagnetic induction source by a sheave, thereby eliminating the influence of an electromagnetic induction. CONSTITUTION:An insulating rod 3 is contacted with a brush 1 which slidably moves with a commutator 2 of a rotary electric machine, and a sheave 4a is provided at the opposite side position to the brush 1. The rod 3 is interposed at a stationary plate 5, a sheave 4b is mounted, and a flexible steel wire 6 secured at one end to the point A of the plate 5 is engaged with all sheaves 4. A weight type displacement converter 7 is provided at the other end of the wire 6 to convert the position of the weight into an electric signal, compares by a discriminator 8 with a brush wear amount input in advance at the normal wear time to discriminate the presence or absence of the abnormal wear and to obtain the remaining operable time. Thus, the portion near an electromagnetic induction source is all in a mechanical type, and can be mounted remotely from the converter 7, thereby eliminating the electromagnetic induction. |
