Motor Selection Help
Motor Selection Help
(OP)
Hi all,
I'm a mechanical engineer and my knowledge on electrical motors is limited so I'm asking for some help here. I need a motor to spin a shaft which will be geared to another shaft. I have the power needed, but I'm wondering if there is a difference in a 1750RPM motor or a 3500RPM motor for example.
a) Will there be any more/less power drawn to either motor?
b) Is there a noticeable lag from electrical input to mechanical output for either motor?
Any help on this matter would be greatly appreciated.
Thanks!
I'm a mechanical engineer and my knowledge on electrical motors is limited so I'm asking for some help here. I need a motor to spin a shaft which will be geared to another shaft. I have the power needed, but I'm wondering if there is a difference in a 1750RPM motor or a 3500RPM motor for example.
a) Will there be any more/less power drawn to either motor?
b) Is there a noticeable lag from electrical input to mechanical output for either motor?
Any help on this matter would be greatly appreciated.
Thanks!





RE: Motor Selection Help
Higher speed means:
Higher gear ratio to drive the load
More noise
Shorter bearing life
Magnified vibrations
-which require better shaft balancing
As to whether you will have less starting torque or less efficiency with the higher speed motor, only the manufacturer's data plate will tell you for sure, but on the whole, that's what I'd expect.
If you want a good introduction to selecting motor types, try looking for the "Cowern papers" on the Baldor website. The PDF is a compilation of application notes and data that any engineer should understand.
Steven Fahey, CET
RE: Motor Selection Help
For fixed speed application, we would consider that the motor reacts to the load rather than load reacting to the motor. Unless you have some unusual controls in mind?
It's not clear which motor gives higher gear ratio since we don't know the target speed of the load.
I agree it wouldn't hurt to peruse the Cowern papers for an overview of motor selection.
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(2B)+(2B)' ?
RE: Motor Selection Help
RE: Motor Selection Help
RE: Motor Selection Help
I appreciate all the help -- i plan on reading up on the Cowern Papers to hopefully make my motor knowledge more robust
RE: Motor Selection Help
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Motor Selection Help
TygerDawg
Blue Technik LLC
Virtuoso Robotics Engineering
www.bluetechnik.com