Electronics > Projects, Designs, and Technical Stuff
Less noisy alternative to servo. Muscle / nitinol wire?
RoGeorge:
A stepper motor does not produces any noise if driven with sinusoidal current. Most of the cheap stepper drivers does not produces sinusoidal currents, thus the stepper is humming/buzzing. Texas Instruments has a few motor driver chips very good at producing clean sinusoidal waveforms.
However, servos are usually driven by DC motors, and gears are noisy, unless special gear profiles and special materials are used.
beanflying:
Things to bear in mind from the OP when he added it.
--- Quote ---since in the project im working i need a lot of servos, around 100 or even more
--- End quote ---
Cost and complexity are a factor. As a simple PWM from most micros will drive a commercial servo it makes more sense over a stepper unless you want to spin custom boards.
artag:
Another common 'linear stepper' mechanism is https://www.ebay.co.uk/itm/401829445368
Anybody know what these are used for ? they seem very widely available.
RoGeorge:
Looks like the mechanism used to move the magnetic heads in floppy disks. The force was rather small, much smaller than in a small servo like SG9.
mikerj:
Someone has made an RC style servo that uses Nitinol wire. It's faster than I thought it would be.
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