Electronics > Beginners
Need advice on designing a stepper motor application that can be commercialized
IanB:
--- Quote from: Mechatrommer on July 15, 2018, 05:34:27 pm ---if you can control the power by PWM to the required speed, you'll get alot quieter motor and no gearbox required.
--- End quote ---
Depends on the PWM frequency. PWM will typically make motors buzz or whistle.
james_s:
It's certainly not hard to make the frequency high enough to be inaudible, especially with low power stuff where switching losses aren't so important.
Mechatrommer:
Well i mean smps actually to be more robust and less whining due to less volt ripple, and yes use freq hi enough.
engineheat:
--- Quote from: Mechatrommer on July 15, 2018, 05:34:27 pm ---
--- Quote from: engineheat on July 15, 2018, 04:59:20 pm ---My previous experience with DC motors tell me they are loud...
at that speed. To get it slow enough I need, I thought about using a gearbox which would add to the noise.
--- End quote ---
if you can control the power by PWM to the required speed, you'll get alot quieter motor and no gearbox required.
--- End quote ---
Is there a limit to how slow PWM can make a DC motor turn? For example, a motor that spins at 5000 rpm under light load, can you really make it spin at 50 rpm with PWM?
How will the load affect the rpm? I don't want the motor to spin at different speeds at different load. The stepper has the benefit in that its noise/speed is pretty much constant whether there is load or not.
Thanks
james_s:
You can make a motor spin at 0 RPM if you like, just applying torque to an object but not actually spinning it.
Speed will of course vary based on load, unless you have an encoder or other method of positional feedback. It's really hard to say without knowing more about the design you are working on.
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