rpm-based controller for variable-pitch prop - WattFlyer RC Electric Flight Forums - Discuss radio control eflight

Electronic Builders Workshop Discuss how to build motors, ESC's, chargers, mixers, etc here

rpm-based controller for variable-pitch prop

Old 01-24-2007, 04:56 PM
  #1  
werner2k
New Member
Thread Starter
 
Join Date: Jan 2007
Posts: 4
Thumbs down rpm-based controller for variable-pitch prop

Hello from Vienna (that one in Austria!). Does somebody know of a nice circuit-diagramm for a feedback-controller, which allows me to feather my variable-pitch prop when reaching a certain rpm value after engaging the electronic brake?
The project (a Grob G109 motorglider) uses a Cyclon 90 brushless motor, a JETI-BECless controller and a 10SLipo-Powerpak.
The variable-pitch-prop can be feathered using a standard-servo from the receiver, but I would like to automate it based on the actual rpm's.
For a sensor either a Hal-senssor or optical one is possible, and I have a solution for counting the sensor's pulses and calculation the rpm's - I just dont want to go all the way to an on-board micro-computer (going back to PIC-programming would be a last ditch-solution) - any suggestions are greatly
appreciated!
werner2k is offline  
Old 03-13-2007, 07:07 PM
  #2  
Cyberwollf
Lawn Dart
 
Cyberwollf's Avatar
 
Join Date: Mar 2007
Location: Ruston, LA
Posts: 70
Default

any progress?

are the sensors's pulses counted analog or digitaly. maybe some ADCs and comparators.
Cyberwollf is offline  
Old 03-14-2007, 09:53 AM
  #3  
werner2k
New Member
Thread Starter
 
Join Date: Jan 2007
Posts: 4
Default

Yes there is progress - I decided to go for the microprozessor-solution, but spawned the pic-processor and decided to use an atmel-chip with the arduino-opensource development environment (thats a free high-level-language, programming-boards at around half the price of pic ones, etc.)
got the development package from italy just this week. the sensor-hw will be an optical one (no magnets on the axle).
werner2k is offline  
Old 05-01-2007, 04:28 PM
  #4  
jperch
Member
 
jperch's Avatar
 
Join Date: Jul 2005
Location: Round Rock, Texas
Posts: 35
Default

If you are already using a brushless controller, you can sense the RPM from teh signals being sent to the motor. You don't need and extra optical or hall effect sensor. Eagle Tree now makes a sensor that electrically conntects to the wires going to the motor and can record motor RPM.

Joe
jperch is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
visalia31
Delta & Flying Wings
4
11-17-2007 05:49 PM
visalia31
Combat
0
11-10-2007 03:24 AM
donjiskra
Airplanes - Electric For Sale & WTB
6
03-21-2007 01:35 AM
donjiskra
Power Systems
0
03-19-2007 05:17 PM
WRX Dave
Power Systems
3
12-04-2006 03:35 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Quick Reply: rpm-based controller for variable-pitch prop


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

Page generated in 0.08517 seconds with 15 queries