A sensory circuit based on an infrared device is designed
and implemented for measuring the speed of DC motor, the
electrical structure is shown in Fig. 3. The primary side of
speed sensory circuit is driven by a constant current source,
therefore, there is an infrared light with constant intensity will
be injected into a reflecting plate which is installed on the
surface of the axis of DC motor. The distance between the
reflecting plate and the infrared device is always kept at
constant value. There is a tape with high reflectivity is attached
on the axis of DC motor. The action of tape, of course, will
follow the measured motor-axis rotation. Moreover, the
reflected light intensity which is received by the secondary side
of infrared device will be limited to be only affected by the
reflectivity of the reflecting plate.
A sensory circuit based on an infrared device is designedand implemented for measuring the speed of DC motor, theelectrical structure is shown in Fig. 3. The primary side ofspeed sensory circuit is driven by a constant current source,therefore, there is an infrared light with constant intensity willbe injected into a reflecting plate which is installed on thesurface of the axis of DC motor. The distance between thereflecting plate and the infrared device is always kept atconstant value. There is a tape with high reflectivity is attachedon the axis of DC motor. The action of tape, of course, willfollow the measured motor-axis rotation. Moreover, thereflected light intensity which is received by the secondary sideof infrared device will be limited to be only affected by thereflectivity of the reflecting plate.
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