# Naked Science Forum

## Non Life Sciences => Technology => Topic started by: investigator2100 on 12/10/2018 08:34:36

Title: How much efficiency will increase if a three layer magnetic circuit is used?
Post by: investigator2100 on 12/10/2018 08:34:36
One electromagnet and two permanent magnets are interacting with each other in an actual device.

When a rotating permanent magnet is installed on the electromagnet, efficiency of the actuator
jumps 60% higher using the same amount of input electricity.

A high qualified scientist and engineer says:
"The magnetic moment is defined as a vector relating the aligning torque on the object from an externally applied magnetic field to the field vector itself. The relationship is given by:
(Torque, in N.m) = (External Magnetic Field, in T) x (Magnetic Moment, in N.m/T))
In your case, Umer, you've moved from one external magnetic field strength (electromagnet) to a second (fixed PM), and then to a third (rotating PM). In each case, the strength of the external magnetic field has increased - or, with the rotating PM, the moment has potentially increased. This is where your "increased efficiency" is coming from. It's not really more efficient at all; you're actually putting more power into the system, and therefore getting more out.
I won't definitively say there is NO increase in efficiency - but it won't be near what you're claiming".

suppose I have correctly measured the efficiency and have found it 60% more than the ordinary circuit, what factor causes this extra efficiency?
Title: Re: How much efficiency will increase if a three layer magnetic circuit is used?
Post by: alancalverd on 12/10/2018 09:35:03
What is your definition of efficiency? It looks to me as though you are measuring linear pull. Rotating magnets are a clever but entirely conventional way of switching a strong pull at a short range with very little input torque.
Title: Re: How much efficiency will increase if a three layer magnetic circuit is used?
Post by: investigator2100 on 12/10/2018 10:11:18
What is your definition of efficiency? It looks to me as though you are measuring linear pull. Rotating magnets are a clever but entirely conventional way of switching a strong pull at a short range with very little input torque.

The  device is not working on  pull only. It is working on attraction and repulsion continuously. It is better if you examine the video. Link to the video is given in the attachment.