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Joined: 25 November 2014
Location: New Zealand
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Posts: 289
Posted: 12 January 2018 at 7:26pm | IP Logged Quote DaveP68

Have been asked a few times how I can validate my claims of F&P stators "correctly load matched" being able to operate with an efficiency of >84%.

Now have just the tool to make an accurate input power measurements of any F&P stator setup.

Use an inline digital torque meter that I picked up from the local hardware store for $70 NZD.

Here is a photo of a 12.2 Nm reading I took last night.

Calculation for the measuring the input power of an F&P stator is;

Power = Torque x RPM divided by 9.5493

Power in Watts
Torque in Nm

Example test run at 600 RPM with torque reading 12.2 Nm.

Input power to stator came to 767 W with an output power of 661 W.

Divide the output power by input power and we get 86% efficiency. I know that 600 RPM doesn't represent a practical operating RPM for most Wind turbines described on this website. Just an illustration of what can be done.

An F&P stator can be >70% above 110 RPM and rise to >80% above 180 RPM. These high efficiencies can only be achieved using a "Load Adaptive Impedance Matching" form of MPPT system.

Have only had this inline digital torque meter for one day so might be able to find some further efficiency gains with some small tweaks here and there.

There are realities if you do not accept, will lead to frustration because you will be spending time on wrong assumptions and the results cannot follow! The Dunning Kruger Effect :)

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