Mechanics and Construction > Mechanics and Construction

fast/accurate linear motion on a budget

<< < (2/2)

MrPrezident:
Why a brushed motor instead of brushless?  Is it because they are cheaper?  I'll take a look at shaft encoders.  I understand the concept, but am not familiar with how to use them.  Would that give me the ability to accurately control position, velocity, and acceleration?

jwatte:
Brushed motors are cheaper, and easier to control, than brushless. You can typically find a brushed motor with gearbox and encoder all built in. Pololu has some nice ones: http://www.pololu.com/catalog/product/1442
Put a small pinion on the motor shaft, and a timing belt, and drive it with a PWM controller and read the sensor. There are controllers that can do both of those functions for you; Pololu JRK; Roboclaw; and a bunch of others.
The one additional thing you need is an end stop, so you know where "zero" is.

Pogertt:
Here is how this was acomplished:

http://dce.fel.cvut.cz/juggler/

EddieAutomated:
Try our discounted linear actuators section. You might find what you are looking for there. You'll certainly be able to find something with the precision and speed needed for a project like that.

Cheers,

Matt Edwards
ActuatorZone.com

Navigation

[0] Message Index

[*] Previous page