Reading motor power

[Autorama]

Here is a little tool made for reading motor power following Ohm’s law: P=V*I.

Motor to be tested (#1) is powered and connected to motor #2. Motor number #2 acts as a dynamo. Motor #3 is a simple charge.

All my voltage and ampere reading are done on motors #2/#3.

The dynamo and the charge never change, this should produce consistent results.

The alligator clips connected to motors #2 and #3 are used to close the circuit for voltage and amperage readings. Voltage readings need to be done in parallel and amperage readings are done in series.

Reading Voltage:

Reading Amperage:

The example above would result in: Power= 4.1118*58.782(ma); Power= 241.699mW. Since the test was conducted at 4 volts, multiply the results by 3 for motor power at 12 volts = 725.099 mWatts.

Here are some more results:

Slot.it Orange #1: 711.90 mW
Slot.it Orange #2: 740.46 mW
Slot.it Orange #3: 722.04 mW
Slot.it White: 725.10 mW
Rewind #1: 1,117.86 mW

Attachments:

1. 

   dyno1.jpg
   

2. 

   dyno2.jpg
   

3. 

   2011-03-15 21.29.02.jpg
   

4. 

   2011-03-15 22.41.02.jpg
   

5. 

   2011-03-15 21.29.34.jpg
   

6. 

   2011-03-15 22.40.43.jpg
   

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