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Originally Posted by tickspe15
To my understanding the reason for using a tachometer over an encoder is that encoders sense position and a tachometer returns velocity in the form of voltage.
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The output of a tach is indeed a voltage proportional to speed.
Absolute encoders sense position, but the raw output of
incremental encoders (like the US Digital E4P) is temporally-spaced voltage pulses which can be decoded into position or velocity.
Quote:
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The idea is that you can have faster and more accurate feedback from motors where you only care about speed not position.
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Dollar-for-dollar, it depends on the application and what decoding capabilities are already in the controller you are using