Running motor by itself: bad? - HeliFreak
Fun, Learning, Friendship and Mutual Respect START  HERE


Unregistered
Go Back   HeliFreak > R/C Electronics Support > Electric Motors, Gearing, Speed Controls, Gyros, Receivers, and Other Electronics Discussion


Electric Motors, Gearing, Speed Controls, Gyros, Receivers, and Other Electronics Discussion Electric Motors, Gearing, Speed Controls, Gyros, Receivers and Other Electronics Discussion


Reply
 
LinkBack Thread Tools Display Modes
Old 06-19-2012, 09:48 AM   #1 (permalink)
Registered Users
 
Posts: 486
 

Join Date: Dec 2010
Location: Pacifica, CA
Default Running motor by itself: bad?

So I'm building my first TRex 450, and I have a newb question: is it bad to spool up the motor, mounted in the heli, but with either no blades attached, or without even the main gear in place? Does it hurt the motor at all to run it with so little (or no) load against it?

I'm not saying I need to do this frequently: I just wanted to make sure the throttle was actually responding to stick input. Just wanted to make sure I didn't harm the motor doing it.
__________________
Blade NanoCPx
Walkera V120D02s
T-Rex 450 Pro V2 (iKon FBL, Castle Ice Lite 50)
DX8
FFF_Ferret is offline        Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 06-19-2012, 09:55 AM   #2 (permalink)
Registered Users
 

Join Date: Aug 2010
Location: Chicago 'burbs
Default

This seems to be another "urban" legend that running a motor unloaded is bad for it.

As long as you are using the same voltage pack that it was designed to be used with, everything will be fine. After all, if you are running a 100% throttle curve, the motor rpm is probably around 80% of that unloaded rpm.

Now with that being said, the motor is making some heat, just the no-load current times the pack voltage. In a normal flying heli there will be some airflow from the rotor wash for cooling purposes. So don't run it for a really long time without some airflow over the motor (although an out runner shell is constantly rotating which provides some cooling and airflow in the motor).
ahahn is offline        Reply With Quote Quick reply to this message
Old 06-19-2012, 10:13 AM   #3 (permalink)
Registered Users
 
Posts: 486
Thread Starter Thread Starter
 

Join Date: Dec 2010
Location: Pacifica, CA
Default

Thanks, that's exactly what I wanted to know.

Makes sense about the heat. I didn't run it long enough to even get warm. But it's good to know this isn't intrinsically bad for the motor.
__________________
Blade NanoCPx
Walkera V120D02s
T-Rex 450 Pro V2 (iKon FBL, Castle Ice Lite 50)
DX8
FFF_Ferret is offline        Reply With Quote Quick reply to this message
Old 06-19-2012, 07:48 PM   #4 (permalink)
Registered Users
 

Join Date: Apr 2011
Location: Australia
Default

Heat wont be an issue, the motor has its own fan (even the scorps but less effective) rotor wash for a motor is practically nothing as you are so close to the hub.

Just keep in mind if you are using a governor, it may not peform very well without the inertia of the drive train so the esc may hesitate or RPM may oscillate. Wont hurt anything but it can be a bit weird.
__________________
-DX8
-MSH MiniProtos Stretched, SK720, DS95/DS95i, Hyp 4S 25C 2500mAh
-MSH Protos Stretched, Brain, Hyp DS16/BLS251, 6S 3000mAh
-Goblin 500, HC3SX, Hyp DH16/MKS980BL, Scorp 4015-1100
desertstalker is offline        Reply With Quote Quick reply to this message
Reply




Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the HeliFreak forums, you must first register.
Please enter your desired user name, your REAL and WORKING email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself. Use a real email address or you will not be granted access to the site. Thank you.
Email Address:
Location
Where do you live? ie: Country, State, City or General Geographic Location please.
Name and Lastname
Enter name and last name here. (This information is not shown to the general public. Optional)
Helicopter #1
Enter Helicopter #1 type and equipment.
Insurance
Please select your insurance company (Optional)
Helicopter #2
Enter Helicopter #2 type and equipment.
Helicopter #3
Enter Helicopter #3 type and equipment.
Helicopter #4
Enter Helicopter #4 type and equipment.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On




Copyright © Website Acquisitions Inc. All rights reserved.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
 

SEO by vBSEO 3.6.1