Stepper Motor

Portescap has introduced hollow-shafted versions to its family of h3 stepper motors which allow wires or other media to be routed through the motor shaft.  h3 hollow shaft step motors are available in NEMA 17, 23 and 34 frame sizes (short, one and two stack lengths available in each frame size), with hollow shaft diameters of 4 mm in diameter, 7 mm in diameter and 11 mm in diameter, respectively.

According to the company, the 1.8-degree step motors' design enables them to deliver up to 30+% higher torque than traditional hybrid step motors. They also feature an aluminum housing for superior heat dissipation and lower power consumption, Neodymium iron boron magnets for optimized torque density, and a bearing retainer and o-ring to help reduce motor noise.  Larger bearings enable the motor to effectively handle higher side and radial loads. 
www.portescap.com