Brushless DC motors are the technology of choice for applications operating at higher speeds. However two different motor architectures can present a selection conundrum, says Madhavan Ramanujam and Cyril Baud. The last decade has seen a growing acceptance of brushless DC motors as an alternative to brushed DC motors for applications requiring combinations of high speed (above 12,000 rpm) and long operating life. There are trade-offs, of course: Coreless brush commutated motors offer simple control and free from cogging, while the complexity of construction of brushless DC motors mean the cost is higher.
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