Quote:
Originally Posted by windtakers
Here's some rough data. (Obtained with help from Richard.)
We measured free amps for one CIM motor and one FP -9015 motor, as follows:
CIM at 12V: 3 Amperes free
CIM at 6V: 2 Amperes free
9015 at 12V: 1.1 Ampere free
9015 at 6V: 0.4 Ampere free
These tests should be repeated under better controlled conditions, with several motors, some run-in time for each motor, and better instruments. Our instruments were a 0-50 Ampere old-school Simpson ammeter and a Cen-Tech (Fluke 87 knock-off) DMM. Our power supply was a 12V DeWalt drill battery, controlled by the DeWalt drill electronic trigger circuit. Will try to post some pictures later.
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Thanks Blake! I understand the caveats you mentioned about test conditions and instrument accuracy, but assuming for the moment the data is sufficiently accurate:
- The data clearly does not follow the Machuchi Javascript applet model (no surprise there)
- The reduction in free current for the 9015 was a greater percentage than for the CIM (no surprise there either).
If you decide to take more data, an interesting test to run would be to reduce the voltage until the motor stops spinning and record that voltage and current.