Product Description:

The STF3648-5268-61-56BC is a permanent-magnet DC motor from Pacific Scientific in the Permanent Magnet DC Motors series. It converts direct current into controlled rotary motion for conveyors, positioning tables, and material-handling axes that need stable speed under load. Because it is a permanent-magnet design, field strength remains fixed, which simplifies speed control with standard DC drives. The motor uses a NEMA 56C frame size, which supports installation on compatible mounting faces and reducers. Its enclosed design makes it suitable for industrial equipment where compact dimensions and sealed operation are important.

This model is designed for a rated armature supply of 180 VDC, and at that voltage it reaches a regulated shaft speed of 1750 RPM. Under continuous duty, it delivers 18.0 lb-in of torque while drawing 2.4 A, and the motor constant is 8.30 lb-in/A. This balance of torque and current supports steady operation in applications that need controlled output rather than aggressive short-cycle overloads. The armature resistance is 3.59 ohms, which helps limit current rise during startup and supports predictable thermal behavior. An armature inductance of 19.60 mH smooths current ripple, so the motor can operate with SCR or PWM speed controllers without excessive commutation sparking.

For short acceleration demands, the motor can accept a peak current of 37.0 A without exceeding its intended intermittent capability. The housing is sealed to IP65 and uses a totally enclosed non-ventilated enclosure, which helps keep out dust and water spray without external fans or filters. That sealed format also suits areas where airborne oil or fine particulates would be a concern for open-frame motors. Continuous mechanical output is rated at 1/2 HP, fitting small pump drives and indexing applications that need moderate power in a protected package. A body length of 11.80 in and a weight of 27 lb support use in compact drive assemblies where mounting space is limited.