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
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
werner2k is offline  
Old 03-13-2007, 07:07 PM
Lawn Dart
Cyberwollf's Avatar
Join Date: Mar 2007
Location: Ruston, LA
Posts: 70

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
New Member
Thread Starter
Join Date: Jan 2007
Posts: 4

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
jperch's Avatar
Join Date: Jul 2005
Location: Round Rock, Texas
Posts: 35

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.

jperch is offline  
Related Topics
Thread Starter
Last Post
Delta & Flying Wings
11-17-2007 05:49 PM
11-10-2007 03:24 AM
Airplanes - Electric For Sale & WTB
03-21-2007 01:35 AM
Power Systems
03-19-2007 05:17 PM
WRX Dave
Power Systems
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