The disadvantages of the Brushless DC Motor over the AC motors are:
higher maintenance (due to brushes)
more expensive
In addition to the above the Brushless DC Motors have the same advantages over AC motors but they also have more advantages over Brushed DC Motors
lower maintenance (no brushes)
even higher starting torque ( Due to rare earth magnets)
even higher efficiency (over 90%) on sub fractional motors
even more compact design
better heat dissipation
lower noise
Baldor’s family of BSM25C and BSM33C brushless motors provide designers with benefits of brushless motors, which include higher torque and more power in smaller packages, reduced maintenance, and quieter operation. These motors are available from stock, with standard NEMA face/foot mount, ranging from .25 to 3 HP (0.18 – 2.2Kw).
The new BMC series controls require no programming, but provide a tight speed regulation better than 0.5% and use the industry standard input command (+/- 10Vdc) or optional pot input for speed control. The control uses standard 115/208/230 Vac and is available from stock.
The combination of BSM motor and BMC control is adjustable to cover a wide speed range to 7,000 rpm, provide adjustable acceleration time from 0.1 – 30 seconds. The combination comes in a fully protected package including motor overload, short circuit and electronic inrush protection.
