Common Rotor Shaft Materials
Common Rotor Shaft Materials
(OP)
What are common rotor shaft materials used in hybrid stepping motors?
Pete
Pete
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Common Rotor Shaft Materials
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RE: Common Rotor Shaft Materials
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RE: Common Rotor Shaft Materials
Pete
RE: Common Rotor Shaft Materials
RE: Common Rotor Shaft Materials
Why might 303 stainless steel be used in a motor design? What are the advantages (besides the obvious corrosion resistance)? What are the disadvantages?
Pete
RE: Common Rotor Shaft Materials
Cons, at least from a repair standpoint, include:
Hard to take a deep cut while machining without changing properties, high initial cost as compared to some other products, welding problems due to changes in characteristics and the fear of hexavalent chromium by the welders. The material also reacts differently than non stainless materials when heat straightening which can cause miscalculations and excess repair times.
RE: Common Rotor Shaft Materials
Pete
RE: Common Rotor Shaft Materials
Using 303 stainless would be the equivalent of air as far as the magnetic flux lines are concerned. This low permeability path means the magnets have to work harder.
This isn't to say that 303 stainless or some other non-ferromagnetic material couldn't be used, it would just be much less efficient from a magnetic standpoint.
RE: Common Rotor Shaft Materials
An old Parker Compumotor catalog states, "Because the shaft of the motor passes through the center of the permanent magnet, a non-magnetic material must be used in order to avoid a magnetic short-circuit. Stepper shafts are therefore made of stainless steel, and this should be borne in mind when handling the motor. Small-diameter motors are particularly vulnerable if they are dropped on the shaft end, as this will invariably bend the shaft."
Curt Wilson
Delta Tau Data Systems
RE: Common Rotor Shaft Materials
Thanks for the input. What you are saying may be fortifying the impression I was under (see my 2nd post).
Pete