Not using brushes, of a motor that does not use physical contacts for the commutator.(adjective)
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Use "brushless" in a sentence
"The synchronous type requires a direct current (DC) exitation, either from an external source (e.g. battery) or from an integrated exitation system, the latter of which are known as brushless, self-exitating generators."
"Such machines are therefore called brushless alternators."
"New motor technologies, generally known as brushless DC motors, or BLDCs, are slightly more expensive than equivalent induction motors, but rising volumes would help close this gap."