I would like to introduce the AEDM-5810-Z12 optical encoder to track a wheel attached to a SY20STH30-0604A stepper motor. I see the rotor length is 15mm, while the AEDM-5810-Z12 thickness is 18.3mm. How can I incorporate the AEDM-5810-Z12 into my design and still have rotor length left to operate the attached wheel? Is it possible to buy a longer rotor or possibly use the SY20STH30-0604A back shaft?



I will post the motor dimensions in my next post.

units=mm

>>2600809 (OP)

 

Define using the SY20STH30-0604A as a backshaft?



Buying a longer rotor could work more / make this easier maybe?

>>2600809 (OP)

Short answer: No. Long answer: pretty sure they don’t sell longer rotors for that motor, maybe there’s a similar type with longer shaft but i wouldn’t really count on it. You could extend the shaft with a coupler. A while ago I tried to move the rotor along the shaft but it doesn’t seem possible with these motors without breaking them, and even if you could move it back it would become too short on the front side for any normal application. If you can get the rotor off cleanly you could get a longer shaft machined probably but seems like a lot of work



Might I ask why you want an encoder on the stepper motor in the first place? It can hardly be more precise than counting steps. 



Also is the wheel directly connected to the stepper shaft? Because if it is you may want to reconsider (can break the stepper), if it is not, then you have a secondary shaft to put the encoder on right
