| 摘要 |
In a device for detecting the speed of a moving member, at least one magnet is coupled to the moving member and has magnetic poles of alternately opposite polarities spaced apart on the magnet in the direction of movement of the latter with the moving member, a generator is associated with the magnet to provide an alternating voltage having its peak magnitude and phase determined by the speed and direction, respectively, of the movement of the magnet, a transformer is excited by a signal, as from an oscillator, and is responsive to magnetic flux from the magnet for producing intermittent control signals at intervals determined by the speed of the magnet movement, and such control signals control a circuit by which the above alternating voltage is sampled at the occurrences of the control signals and a D.C. output voltage is provided corresponding, in its magnitude and polarity, to the speed and direction, respectively, of the magnet movement.
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