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[gotoluc]

Hi Luc

A test well done,but there is one vital part missing from it,and that is--what was the benchmark for the motor(prime mover) in standard trim ,driving the generator with the 5 ohm load at 1500 RPM ?.

This is something you need to know,so as you know whether you are going north or south,as far as efficiency from that of the motor running in standard!off the shelf! trim,driving the same load at the same RPM.

Just a thought.

Brad

Yes Brad, you're right!... I did think of doing that test and the motor is more efficient by 1.5 watt running with the 4 brushes and magnet poles as it was designed. I thought it may be the case. So unfortunately it is still inconclusive if there's any gain.


I started tests on a modified 2 pole PM treadmill motor. So I should have a much closer replication then the 4 pole motor I just tried to see what happens.
I'll share in a few days. You'll probably beat me to it if you're working on it this weekend.


Thanks and looking   forward to see what you come up with.


Luc

[tinman]

Yes Brad, you're right!... I did think of doing that test and the motor is more efficient by 1.5 watt running with the 4 brushes and magnet poles as it was designed. I thought it may be the case. So unfortunately it is still inconclusive if there's any gain.


I started tests on a modified 2 pole PM treadmill motor. So I should have a much closer replication then the 4 pole motor I just tried to see what happens.
I'll share in a few days. You'll probably beat me to it if you're working on it this weekend.


Thanks and looking   forward to see what you come up with.


Luc

Well there you go  ,a new discovery just made.
We can now do what PW and other EE guys said could not be done.

Luc
When you get your two pole setup done,let me know--i need to show you this-->your going to love this  . You may have seen it already,but just skipped right passed it.
I to am using a motor from a tread mill,so we should be on a close to even playing field here.

This--this will change the way we look at what is happening inside the motor,as far as power go's.


Brad

[gotoluc]

Well there you go  ,a new discovery just made.
We can now do what PW and other EE guys said could not be done.

Luc
When you get your two pole setup done,let me know--i need to show you this-->your going to love this  . You may have seen it already,but just skipped right passed it.
I to am using a motor from a tread mill,so we should be on a close to even playing field here.

This--this will change the way we look at what is happening inside the motor,as far as power go's.


Brad

Sounds good Brad


However, maybe you miss understood that the motor uses 1.5 watts less in the standard 4 pole configuration then in the 3 bush configuration with all in and out power calculation.
So possibly the 3 brush idea may not work on a 4 pole/brush motor, which is the reason I moved to a 2 pole/brush motor as they used.


We'll see what comes of it.


Luc

[tinman]

Sounds good Brad


However, maybe you miss understood that the motor uses 1.5 watts less in the standard 4 pole configuration then in the 3 bush configuration with all in and out power calculation.
So possibly the 3 brush idea may not work on a 4 pole/brush motor, which is the reason I moved to a 2 pole/brush motor as they used.


We'll see what comes of it.


Luc

Nothing to do with P/in P/out as such Luc-->we now have a way to see the supply voltage(as we already know),the actual BackEMF voltage(never before seen),and the actual voltage the motor is running on(never before seen),which is the supply voltage minus the BackEMF voltage
We now have a way to watch all three voltage valuse using nothing more than DMMs or a scope.
We can now see how these values change in real time, when a load is applied to the motor.
No more guessing--it's now all in plain sight.

Here is an example.
The motor is being supplied with say 20 volts at X amount of current.
As we start to place a  load on the motor,we can now watch in real time the actual voltage within the motor that the motor is running on,and the BackEMF induced voltage change as the load is increased.

So here is what i did to confirm this.
First i measured the resistance across the motor before hand.
I then place 20 volts across the motor from the PSU.
The backEMF induced value read say 17.6 volts,and the actual voltage across the motor(the actual voltage the motor is running on is only 2.4 volts. The total equals the supplied 20 volts.
Confirmation is by way of ohms law,where the 2.4/5 ohms exactly equals the current draw of 480mA.
No matter what the load,the actual voltage(the supply minus the induced BackEMF voltage) divided by the resistance of the motor windings,always equals the input current--in every test i have done.

So,regardless of the outcome,we can now visually watch the induced BackEMF voltage,and actual voltage across the motor winding,as we are testing the DUT.
This will be very helpful when making modifications and testing for more efficient motors.
All we need to do now,is increase the induced BackEMF voltage as much as we can,and reduce the actual running voltage across the motor.

Very glad you decided to do this replication Luc.


Brad

[lancaIV]

Later for trial : http://www.solenoidcity.com/solenoid/manual/minimizingenergy/minimizingenergy.htm