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ZWO AM5 Harmonic drive

 


 compare with a few others


 Motors:

Drive – Harmonic drive + Synchronous belt (Reduction ratio: 300:1)

Reducer specification (RA) – NEMA 17 (Reduction ratio: 100:1) 
ZWO-17-100-C1-TTT

Reducer specification (DEC) – NEMA14 (Reduction ratio: 100:1)

Periodic error – ＜±20”

PE duration – 432s

Drive (RA) – Harmonic NEMA17 stepper motor + Brake
17D4401-19BK Bipolar

Drive (DEC) – Harmonic NEMA14 stepper motor
14M3404 Bipolar

They mentioned that 900mm focal length is probably the maximum practical for this mount 

Btw, The Alt Az base and adjustment knobs has so much resemblance to Rainbow 's RST135

zwo

hpn

faq , 

on periodic error and others

Rainbow comments on periodic error, even incorporation of an encoder, will not remove those irregular periodic error from strain wave spline gear 

Teardown 


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