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Re: (ET) ET test box



A motor will look most like a motor :-)

The motor then needs a mechanical load... you could probably come up with some sort of big heat-dissipating brake to do this.

Or make a simple passive dynamometer. Connect the output shaft of the compound wound motor to a PM motor, which will run as a generator. Connect the terminals of the PM motor to an electric load (resistors, inverter, etc). Vary the electric load on the PM motor to vary the mechanical load on the test motor. To be a true dynamometer, you'd have to add meters to measure the resulting rpm & torque but you may not care in this case.

Building your own controllers by chance? Collecting a box full of blown FETs is always fun...


Geof Thompson wrote:
Gentlemen
I have a Technical question. I would like to create a test (load) box replicate the load, of a ET motors so that I can benchtest controller etc. I have quite a few machine that I need to restore and repair. I am thinking for a PM motor a large resistor will work, but motors with field weakening is beyond my limited electrical design capacity. Any ideas would be welcomed along with suggested values of the components etc. To say this another way I am looking to make a test box with meters and resistors which will look like a motor to the Electrak controlers. Once I get this going I will be happy to share the design.



--
Jim Coate
*The Electric Tractor Store*
http://www.ElectricTractorStore.com

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