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Encoder simple 1 channel to check ac motor stall

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sherazi

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HI!
i want to check any motor stalls while my motor is energized, motor is AC, i would like to use an encoder!
but i am not certain how to use it! i dont need any positioning or angle checking so only 1,0 encoder would work, how should i use it in my AVR, i have no interupt pin available, and i have to use it with polling ,

what i want is just to be sure that while my AC Power is On to the Motors , i would check if motor is rotating or it has been stalled

Plz guide me with the algo and the better encoder approach,

on idea that i just got is to check the encoder output at a certain pin 4-5 times at different location of the polling loop, if the reading is same as that of previous i add a counter, if its different the counter is reset, and whenever a counter value exceeds 20 , it means it is a stall!


any suggestions??
 

montech

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What encoder have you considered using? 1000 count per revolution? What processing scheme are you using?
 

klystron

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I will not use a shaft encoder that requires a coupling with the shaft and that is expensive.
Fit a target to the shaft and sense shaft rotation with an inductive proximity probe. Convert the frequency of the proximity probe pulses to a voltage. Use the presence of this voltage and the presence of the current signal in combination logic for interlocking
 

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