Product Description:

The SR3640-773-48C is a permanent-magnet DC motor manufactured by Pacific Scientific for the Permanent Magnet DC Motors series. It is suited for speed-regulated conveyors, feeders, and other low-inertia axes that need smooth torque during starts, stops, and slow indexing. The motor uses an enclosed housing, so it can be mounted close to airborne dust or shavings without depending on open ventilation. This layout also helps the unit fit industrial automation cells where exposed cooling paths are undesirable and space around the motor is limited. It is intended for applications that need predictable speed control rather than intermittent burst operation.

At its rated operating point, the motor accepts 90 VDC from an SCR drive and draws 3.1 A of armature current. Under those conditions, it delivers 1/3 HP while turning at 900 rpm, giving a stable operating point for moderate-duty motion tasks. The motor has a TENV enclosure, and its control characteristics are matched to the chopped output of standard silicon-controlled rectifier speed controllers. The armature windings are polyester-impregnated to resist moisture and vibration, and the fused commutator helps reduce brush arcing during rapid reversals or frequent speed changes. That behavior supports smooth response from common DC speed control packages.

The motor uses sealed ball bearings that retain lubricant for the life of the unit, which reduces routine maintenance needs in continuous service. Its brushes are field-replaceable, so service can be completed without removing the wiring from the motor terminals. A gasketed conduit box protects the terminations against coolant splash and helps keep connections enclosed during operation. An anti-cog magnet geometry helps keep torque ripple low at crawl speeds, which is useful when a conveyor must index precisely or hold a steady slow feed rate. The bearing and brush arrangement also helps simplify long-term upkeep in machines that run frequent daily cycles.