Machinedesign 5941 Pittmandgbi 05moto 1 0

Mini slotless, brushless motor

July 11, 2013
The BI-05 Series slotless brushless-dc motor is designed for use in precision equipment such as surgical and dental tools, medical instruments, and other health-care devices in which small component size is crucial.
The BI-05’s slotless motor design eliminates the magnetic cogging typically found in conventionally wound “slotted” brushless-dc motors. The stator teeth are eliminated by forming and encapsulating the entire stator winding along the inside surface of the back iron, resulting in zero detent torque, low inductance, and extremely fast response rates. The miniature motor is capable of no-load speeds up to 60,000 rpm and continuous-output torque up to 0.9 oz-in. (0.0064 Nm) and features shielded ball bearings and a tight roto- balancing spec. The motor is constructed of a combination of 17-4, 300, and 400-Series stainless steels. Its four-pole rotor is built using high-energy neodymium magnets, and an internal circuit board supports Hall-sensor feedback spaced at 120 electrical degrees.Pittman Motors, 343 Godshall Dr., Harleysville, PA 19438, (267) 933-2105, www.pittman-motors.com

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