Leopard 3665/2100kv

[tlandauer]

Looks like my gambling paid off, well sort of.
I received my two motors from this Chinese site which I thought I will go to dispute since I couldn't get hold of them.
Now the question: one of the motor is erratic when you turn by hand, it can be turned and has the normal cogging, but then it seems there is resistance building up, it is not the cogging that builds up, it is like a piece of cotton stuck inside, kind of sort-smooth resistance, or you can say an invisible hand is trying to grab the rotor .
I know on some BL system ( CC car BL system) when you turn off the juice, because the capacitiors in the ESC still have charge, you turn the wheels of the car and the motor is "held" by some invisible force, but I have not connected this motor to power, is this DOA?

[tlandauer]

Now both do the same thing, I think the rotor magnifies the stator steel slots and it is definitely the magnetic field strength that I am feeling. Strange that I have never felt that on their 40xx motors, for that matters any other motors. Only way to tell is to hook them up and take a plunge ( no punt intended).

[lenny]

Are any of the wire ends touching each other when you try to turn the motor ?
Because sometimes that will add to the normal resistance of the motor cogging.

[tlandauer]

Are any of the wire ends touching each other when you try to turn the motor ?
Because sometimes that will add to the normal resistance of the motor cogging.

Lenny, I checked, nothing is touching inside, I noticed that when I first took it out of the box, it spins relatively with ease, then the resistance builds up. The other motor then did the same, it is as if there was some charge.

[tlandauer]

Came back from work, so the motors have not been touched for a few hours, it's back to "normal", easy to spin. as if the magnetic charge has disappeared.
I understand this kind of post/observation can easily land myself on the "to be ignored" list!
But any educated enlightenment is greatly appreciated!

[tlandauer]

OK, before I get banned , I found out that if the wires ( the male banana plugs that the factory installed) are accidentally touching each other, it will "freeze up", why is that?
I understand that a brushed motor can be a "generator" if it is spinned by an outside power source, but I though BL motor does not produce any "juice" ?

[tlandauer]

OK, before I get banned , I found out that if the wires ( the male banana plugs that the factory installed) are accidentally touching each other, it will "freeze up", why is that?
I understand that a brushed motor can be a "generator" if it is spinned by an outside power source, but I though BL motor does not produce any "juice" ?

Never mind, high school physics came back: been in the music business for too long.
Brushed direct current motor and BL is the same, just opposite when it comes to the stator and rotor, I now realize if you contact the two wires on a brushed motor, exact same thing will happen only the friction /pressure of the brushes is too big that it is not noticeable when this happens. When the coil is charged, it magnetizes the stator in the BL and the rotor in the brushed motor!
Did i get it right?
The joke is on me, folks!