Once you've chosen brushed motors, you can choose between graphite brushes and precious metal brushes. When to choose what?
- Well suited for high currents and peak currents
- Well suited for start-stop applications
- Larger motors (> approx. 10 W)
- Higher friction, higher no-load current
- Not suited for small currents
- Higher audible noise
- Higher electromagnetic emissions
- Higher costs
Precious metal brushes
- Well suited for smallest currents and voltages
- Well suited for continuous operation
- Smaller motors
- Low audible noise
- Very low friction
- Low electromagnetic interference
- Cost effective
- Not suited for high and peak currents
- Not suited for start-stop operation
Tattooing is typical a start-stop application, which make graphite brushes the best solution.
5 out of 6 rotary tattoo machines with maxon DC-motors have graphite brushes.
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