# How to reduce the Back EMF in an electricity generator?

#### humptydumptyaac

Joined Nov 3, 2021
24
Hi, I'm new to most things physics.

I'm studying electricy generation and I'm wondering if there's a way to reduce the back EMF by at least 50%, ideally up to 90%.

I found this video on youtube (starts around 6:25):

It presents a certain design which supposedly reduces the back EMF.

But being a newbie and all - it's not clear to me exactly how it works, and I haven't heard him say by how much it reduces it.

What other thoughts do you have, perhaps using a different mechanism, on how to reduce the back EMF?

Thank you.

#### nsaspook

Joined Aug 27, 2009
13,418
It's all BS. There is nothing secret or novel here.

#### BobTPH

Joined Jun 5, 2013
9,129
Back EMF is priduced in a motor when driven by electric power. In a generator, the EMF is the power it is generating. The analog of back EMF in a generator is the mechanical resistance to spinning it, and it cannot be reduced, it must equal the power generated. This is basic physics.

Bob

#### humptydumptyaac

Joined Nov 3, 2021
24

#### humptydumptyaac

Joined Nov 3, 2021
24
Back EMF is priduced in a motor when driven by electric power. In a generator, the EMF is the power it is generating. The analog of back EMF in a generator is the mechanical resistance to spinning it, and it cannot be reduced, it must equal the power generated. This is basic physics.

Bob
Thank you, Bob

#### LowQCab

Joined Nov 6, 2012
4,196