Product Description:

The PWM5330-5711-45B is a direct-current treadmill drive motor produced by Pacific Scientific and supplied under the PWM Brushed Treadmill Motors series. In automated fitness equipment and other variable-speed conveyors, it converts a fixed DC bus into controlled mechanical rotation, allowing the control system to regulate belt velocity and loading precisely. Its brushed design is suited to applications that need stable speed control during repeated starts, stops, and load changes.

This model is energized from a nominal 220 VDC source, so drive electronics must deliver that bus level for rated operation. Under full mechanical load, the armature draws 17.1 A, a figure that affects conductor sizing and thermal design inside the enclosure. At that electrical point, the motor outputs 4 HP, providing sufficient torque for user weight and incline changes on commercial treadmills. Shaft motion stabilizes at 3400 RPM, a speed that pairs with common pulley ratios to reach typical belt surface velocities. The commutator incorporates 56 copper bars, giving many electrical switching intervals per revolution; this reduces brush arcing and smooths current transition between armature coils.

The armature laminations contain 28 slots, and that slot pitch works with the bar count to minimize torque ripple while keeping winding resistance low. Core geometry further shapes performance: a stack diameter of 3.68 in establishes the magnetic air-gap path, while a stack length of 3.66 in sets the axial flux volume that limits continuous torque before saturation. These dimensions support heat dissipation and power density during extended operation. Finally, the build quality expected from Pacific Scientific supports consistent commutation and brush life throughout repeated acceleration, deceleration, and load variations in industrial motion profiles.