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DC Brushless Motor Monitor 1   --  June 26, 2011

The circuit below was requested by a person needing a way to keep track of the number of hours a 24v DC brushless motor was in operation.  The circuit taps into a bit of the power going into the motor using a bridge rectifier and filter capacitor.  The voltage produced feeds the input of a small solid state relay.  The output of the relay routes AC power to an hour meter, every time the brushless motor is turned on.  This same circuit could be used with other DC motors with some simple modifications.

Click on Drawing Below to view PDF version of Schematic

DC Brushless Motor Monitor designed by David Johnson, P.E.

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