SRF3744-5487-84-5-56-BC Kollmorgen
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The Kollmorgen SRF3744-5487-84-5-56-BC is part of the SR and SRF Permanent Magnet Motors series. It features a TEFC enclosure, a 56C frame size, and a SCR-rated duty type. The motor has a shaft diameter of 0.6250 inches, a shaft length of 1.875 inches, and operates at a rated speed of 1750 RPM.
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Product Description:
The SRF3744-5487-84-5-56-BC is a permanent-magnet DC motor manufactured by Kollmorgen for the SR and SRF Permanent Magnet Motors series. It is intended for automated machinery that requires a stable speed-torque profile under armature voltage supplied by a phase-controlled drive. In production cells, the motor’s magnetic circuit and lamination stack support repeatable motion without requiring elaborate feedback. Its totally enclosed, fan-cooled housing protects the windings from airborne oil and particulate contamination.
The motor is classified for SCR-rated duty, meaning its armature is designed for the pulsating DC produced by silicon-controlled rectifier converters. A TEFC enclosure keeps ambient air away from internal components and uses an external fan to remove surface heat, helping keep the continuous temperature rise within insulation limits. Mechanical dimensions follow the NEMA 56C face standard, allowing the frame to bolt directly to compatible close-coupled pumps or gear reducers without adapters. Under rated excitation, the armature reaches 1750 rpm, a common base speed suitable for processes operating from 60 Hz line power. Torque is transferred through a precision-turned shaft with a diameter of 0.6250 in, balancing torsional strength with low rotor inertia for rapid speed changes. The threaded mounting holes on the C-face use 3/8-16 UNC-2B threads that accept standard Grade 5 cap screws.
The flange has a bolt circle measuring 5.875 in, providing the required spacing for secure attachment to the driven equipment. A shaft key measuring 0.188 x 1.38 in provides positive engagement with a compatible coupling or driven component. The face includes a tapped pattern of 3/8-16 UNC-2B holes arranged around a locating pilot with a diameter of 4.500 in, helping maintain concentric alignment between the motor and load. Proper pilot engagement minimizes radial runout that could otherwise increase coupling wear or transmit unwanted vibration to connected machinery. A 1.875-inch shaft extension provides sufficient engagement length for couplings while leaving room for a shaft seal or tachometer collar when the application requires one.
