Steorn's Patented Measuring Device & SKDB

[gravityblock]

I suspect this project will not allow to measure the torque.
This system does not use a clutch or a torquemeter.
In this case we can measure the torque only during acceleration knowing the moments of inertia of rotating mass.

see
http://en.wikipedia.org/wiki/Dynamometer

You only need to calculate the moment of inertia by hand if you're not using a circular flywheel.  If you're using a circular flywheel, then you enter in the outer and inner dimensions, and the density or mass (you don't need to know both, only need to know one or the other) and the software will do all of the other calculations.

This system is good to calculate the torque provide by the magnetic interactions during acceleration.  It is not meant to measure the operating torque when it is under load, as you suggested.  In addition it calculates the RPM, and will give you the Torque and Power VS RPM Curves.  The motors effieciency at it's peak RPM can be calculated by:  Efficiency = Max Power From Graph / (Volts * Amps).

A simple system like this would allow one to know the optimal distance between the dual rotor magnets and the toroid core along with the optimal strength for the magnets, etc.  It's better than doing it totally blind.  Steorn is measuring the torque during the magnetic interactions for a reason, because it's important to know for optimal performance.  A member of Steorn's SKDB is using this, for his replications.

I'm sorry it doesn't meet your standards or expectations.  I think it will be able to do the task at hand, which is measuring the torque during the magnetic interactions during acceleration, and in the end, this is the purpose of doing these measurements.

GB

[wings]

You only need to calculate the moment of inertia by hand if you're not using a circular flywheel.  If you're using a circular flywheel, then you enter in the outer and inner dimensions, and the density or mass (you don't need to know both, only need to know one or the other) and the software will do all of the other calculations.

This system is good to calculate the torque provide by the magnetic interactions during acceleration.  It is not meant to measure the operating torque when it is under load, as you suggested.  In addition it calculates the RPM, and will give you the Torque and Power VS RPM Curves.  The motors effieciency at it's peak RPM can be calculated by:  Efficiency = Max Power From Graph / (Volts * Amps).

A simple system like this would allow one to know the optimal distance between the dual rotor magnets and the toroid core along with the optimal strength for the magnets, etc.  It's better than doing it totally blind.  Steorn is measuring the torque during the magnetic interactions for a reason, because it's important to know for optimal performance.  A member of Steorn's SKDB is using this, for his replications.

I'm sorry it doesn't meet your standards or expectations.  I think it will be able to do the task at hand, which is measuring the torque during the magnetic interactions during acceleration, and in the end, this is the purpose of doing these measurements.

GB

I like these free projects
My standards are used, open source, simple.

I apologize if my comment may be hard but English is not my language

[gravityblock]

I like these free projects
My standards are used, open source, simple.

I apologize if my comment may be hard but English is not my language

No offense taken.  I agree, it may not be the best solution, but it does keep the costs down in the experiments.  It may be a good indicator for the optimal parameters and helpful in the fine tuning of the system.  I plan on testing this idea.  I'll be happy if it just gives me accurate RPM readings, but it should give good data on the torque during acceleration also.  It could always be used in future projects that is unrelated to this topic.

You keep up the good work.  I do enjoy reading your posts.  I had a bad day here and I shouldn't bring it to the forum.

GB

[gravityblock]

Steorn has opened their SKDB Lite to the public. https://kdb.steorn.com/index.jspa

GB

[verpies]

Is that why nobody is communicating here?
Anyway the SKDB Lite is useless because a secret and MANDATORY "Discount Code" is needed to sign up for it.