Calculate and find back EMF of motor.

Thread Starter

Track99

Joined Jun 30, 2022
15
Hello my friends. I am in the middle of a toy boat project. I am trying to calculate the back EMF of the BLDC motor. I made a nice picture of the circuit here below.

I want to see how much the back EMF is?

I have the OScope on the circuit and my O-Scope is telling me that the back EMF is about 60% of the source voltage. Is this making sense to you?

1) Can you tell me how I can use a pencil and paper and find out the back EMF of this motor? ( I have a print out of the motor data sheet )
2) Can you tell me how I can use the O-Scope and find the back EMF of this motor?


( I read other google sites but nobody gives me a clear answer and procedure for this problem )
Thank u
Fawaz

This is how my test circuit is wired on my table right now.
Untitled Diagram (1).jpg
 
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