Posted by MarkB_MI on January 13, 2012 at 03:17:33 from (32.178.195.116):
In Reply to: Re: follow up posted by teddy52food on January 12, 2012 at 18:00:18:
How quickly you abandon your theory. It is said that a theory is never truly proven, as all it takes is one example where the theory fails to disprove it. Your theory is, paraphrased, "magnetic field strength is proportional to voltage and is not related to current". I simply tested one specific case: zero current, with non-zero voltage. Your theory fails.
To prove anything with your various tests, you need to simultaneously monitor current, voltage, speed and torque. current times voltage equals power in, speed times torque equals power out. I have no idea how you claim to have performed your test, but I seriously doubt it was instrumented in such a way that that you can prove your point. Did you maintain constant torque on the motor using a dynamometer? Did you record the current and voltage versus time using an oscilloscope?
The behavior of dc motors is very well understood. The no-load speed of a motor increases with voltage. The torque of a motor is proportion to the current through the motor. volts times current equals power in. torque times speed equals power out.
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