| 摘要 |
An apparatus for monitoring and warning of an undesirable velocity condition in a rotating shaft includes a magnetic reed switch having on and off domains oriented with respect to an actuation magnet which is displaced on an outward radial path with respect to the shaft by centrifugal force, such that the actuation magnet can pass from within an on domain to within an off domain and vice versa, thereby switching the reed switch on and off according to the speed of rotation of the shaft. The reed switch is connected electrically to a warning light or buzzer or control circuit. An alternative embodiment employs a ferromagnetic shield variously interposed between the actuation magnet and the reed switch in response to centrifugal force.
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