DC micromotors offer speeds up to 70,000 RPM for medical applications

August 31, 2012 // By Julien Happich
Pittman Motors' slotless brushless DC motors are aimed at medical applications, such as high-speed surgical tools, dental tools, medical instruments, and other small medical devices.

The slotless design eliminates magnetic cogging and the stator teeth are completely eliminated by forming and encapsulating the entire stator winding along the inside surface of the back iron. The result is zero detent torque, low inductance and fast response rates. The company's smallest high-performance motor is 9.53mm in diameter with a maximum speed of up to 70,000 RPM and a torque rating of up to 0.002Nm. Overall length is 50.8mm. The motor has a 2 pole permanent magnet rotor, a 3 phase stator and sensorless commutation.

Larger diameters in the high-performance line include 12.7, 20 and 28mm with maximum speeds up to 60,000 RPM and torque ratings from 0.006Nm to 0.105Nm. Each diameter has two available stack lengths. The motors are constructed using 4 pole rotors, 3 phase stators, and integral hall sensor feedback spaced for 120 electrical degrees. Standard features for the high-performance DC motor offering include shielded ball bearings, stainless steel construction and high-energy neodymium rotor magnets. Permanent magnet rotors are balanced for smooth and quiet operation at high speeds. Autoclavable versions are available in all motor sizes.

Visit Pittman at www.Pittman-Motors.com