I am using a DC 24v scrapped photocopier motor for a table fan.
To save energy, it's ON for 2 seconds and OFF for 3 seconds using MCU.
The fan keeps rotating during the power off state.
Is this a good practice?
DC Motor control
dcdc motormotor
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Best Answer
What Joe said - a faster time constant would be better, motors fail more quickly if they are speeding up & slowing down like that (we used to get major fan bearing failures on kit which had temperature-switched fans compared with stuff that just ran the fans all the time).
You may also find when it's spinning freely it's generating back-emf which could be feeding back into your circuit, so be aware of that.