| 摘要 |
Provided is a switch (20) suitable for use in a brush wear monitoring recording circuit that provides switching by capacitive means. The switch comprises a stationary part and a moving part. The stationary part comprises a switch plate (21) with a face (23) while the moving part comprises a capacitive flag (13) mounted on a brush (2) wherein the capacitive flag (13) comprises a capacitive plate (17) with a face (18) fixed on a brush hook (16). The switch plates (17, 21) and the faces (18,23) thereof are configured and arranged such that brush wear changes the state of the switch by the capacitance of the switch (20) increasing as the brush wear moves the faces (18,23) of the places (17,21) so that they face each other.
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