Product Description:

Pacific Scientific manufactures the SR3642-4822-56BC-CU permanent-magnet direct-current motor as part of its Permanent Magnet DC Motors series. In automated machinery, the unit supplies stable shaft power from a DC drive, supporting precise speed control and bidirectional motion for conveyors, packaging tables, and light process equipment. The self-contained field magnets eliminate the need for external excitation, which reduces wiring complexity and helps keep the installation compact. This layout also supports predictable torque response in applications that need steady low-speed regulation and repeatable acceleration.

The motor uses a 56C face-mount frame and a totally enclosed non-ventilated housing, allowing installation in dusty indoor locations without forced airflow. Under continuous duty, it draws 4.7 A from a 90 VDC supply and produces a steady shaft output of 18.0 lb-in. That torque is delivered at 1750 RPM, which suits common DC drive operating points in material-handling equipment. With a torque constant of 4.2 lb-in/A, armature current remains closely related to output torque, which helps the drive maintain consistent response during load changes. The armature resistance of 0.9 Ω helps limit steady-state losses, and the overall motor length of 12.10 in keeps the assembly within standard C-face enclosure depths.

The motor can accept a peak armature demand of 74.0 A for short acceleration periods without demagnetizing the field. This surge supports as much as 1/2 HP of mechanical output during startup and other brief high-load events. Electrical transients are moderated by an armature inductance of 3.8 mH, which helps keep current ripple within the operating range of standard DC controllers. For mounting purposes, the laminated steel frame and rotor bring the total mass to 27 lb, so the supporting structure must hold that static load while preserving shaft alignment with the driven equipment. The enclosed housing and direct-current design make the motor suitable for machines that need reliable speed regulation in a compact package.