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Brushless DC Rotor Position Question

by benjaminbailes
Tags: brushless, position, rotor
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benjaminbailes
#1
Jan31-13, 08:56 PM
P: 4
Hi. I am curious about ways to sense the position of a rotor in a BLDC motor. I am familiar with hall sensors and back emf but am wondering if there are other ways to find the position of a rotor maybe more accurately.

I had an idea about using a laser and a photoresistor around the circumference of the stator that would use the varied resistance to give a voltage reading to a microcontroller that could be used to find the position. Maybe I'm way off with that one I can see some problems like heat from the motor messing with the resistance. If anyone could give me some suggestions on what's out there I would appreciate it.
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I_am_learning
#2
Feb4-13, 12:17 PM
I_am_learning's Avatar
P: 669
They are called rotary encoders.
http://en.m.wikipedia.org/wiki/Rotary_encoder#section_5
benjaminbailes
#3
Feb4-13, 09:19 PM
P: 4
Quote Quote by I_am_learning View Post
Thanks for the tip

Turst
#4
Feb4-13, 10:56 PM
P: 1
Brushless DC Rotor Position Question

Resolvers are also useful for absolute position.


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