Quote:
Originally Posted by NiHaoMike
Use an encoder wheel with a wider gap or cog in one spot. That's how most crankshaft sensors are designed. I don't think exact position is that critical for induction motors, only switched reluctance or synchronous AC. (In the case of switched reluctance, the motor itself can be used as a position sensor by measuring inductance.)
The ABS sensors (as well as camshaft and crankshaft sensors) I have seen are actually inductive. The sensor circuit applies a high frequency AC signal to the sensor and uses it as part of a voltage divider. The inductance varies depending on whether the sensing coil is over a cog or gap, which changes the impedance and the voltage division ratio.
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Hey thanks! Is that how all the ABS sensors work? I just assumed it was laser because there is a little "window" like area, and it quit being stupid every time I cleaned the dirt from the sensor housing in that area.
It just made sense, I guess.
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