Product Description:

The SR3642-4822-7-56BC-CU is a permanent-magnet DC motor manufactured by Pacific Scientific as part of the Permanent Magnet DC Motors series. Designed as a compact 56C-frame prime mover, the unit converts 90-volt direct current into steady shaft rotation for conveyors, web-handling equipment, and other automated machinery. Its totally enclosed non-ventilated housing helps keep airborne debris away from the windings, while the keyed shaft and 5.875-inch bolt circle support direct coupling to gearboxes or pump heads in tightly packed control cabinets.

The motor operates from a nominal supply of 90 VDC, a common bus voltage for industrial rectifier drives, and it turns at a rated speed of 1750 RPM, matching standard pulley and gearbox selections. During continuous duty, the armature draws 4.7 A to produce a steady output torque of 18.0 lb-in. These operating values keep thermal loading within the dissipation capability of the enclosed housing without external airflow. The electromagnetic design yields a torque constant of 4.2 lb-in/A, so each additional ampere produces proportional torque for precise current-loop control, while the 3.8 mH inductance smooths commutation and the 0.188 × 1.38-inch key helps prevent slip between the shaft and the driven element.

For intermittent overloads, the armature can accept a momentary surge of 74.0 A, allowing the machine to overcome breakaway friction without requiring a larger drive. At rated conditions, the motor delivers 1/2 HP of mechanical power, and its 4.5000-inch pilot diameter supports accurate centering during installation. The low winding resistance of 0.9 Ω limits I²R losses and helps control temperature rise during continuous operation, while the 12.10-inch overall length supports heat spread along the laminations. A sealed TENV enclosure supports installation in dusty packaging cells without external ventilation.