Goedendag
"Some of us may have run across a brushless motor that has questionable operation, perhaps after overheating it, or after crash damage. It may even have come from a swap shop. The question is "Do you want to connect it to an ESC" and risk possible damage to the ESC? ..."
Several simple test methods:
http://www.wattflyer.com/forums/showthread.php?t=35216
&
http://www.rcgroups.com/forums/showthread.php?t=240993
Vriendelijke groeten Ron van Sommeren
• brushless motor building tips & tricks
• diy brushless motor discussion group
• Drive Calculator download & discussion group