Product Description:

The SR3640-8293-7-13-48BC is a direct-current rotary actuator built by Pacific Scientific and supplied within the Permanent Magnet DC Motors series. As a permanent-magnet unit, it converts electrical energy from a fixed-voltage source into adjustable shaft torque for conveyors, indexing tables, and other low-voltage industrial drives that require compact speed control. The frame size and shaft dimensions suit compact machine layouts and common SCR-controlled drive arrangements. The design is suited to low-voltage motion systems that need straightforward speed adjustment from SCR or PWM DC controllers.

At a nominal supply of 90 VDC, the motor delivers a shaft output of 1/2 HP while maintaining a base speed of 1750 RPM. That speed is produced under a Continuous Duty rating, meaning thermal equilibrium is sustained during uninterrupted operation. The motor uses a TENV enclosure, which helps keep airborne contaminants away from the internal windings, so external airflow is not needed in clean indoor environments. Output torque remains flat across the working range, enabling accurate tension control in web handling lines or metering pumps. The permanent-magnet DC topology permits linear speed-torque control from simple SCR regulators without field excitation overhead.

A rugged fused commutator resists flashover during current surges. The motor uses field-replaceable brushes, which simplify service because they can be changed without disassembling the endbell. Its magnetic circuit uses an anti-cogging magnet design, so torque ripple is reduced at low speed, and a polyester-impregnated armature helps protect the windings from moisture and centrifugal forces. The brush and commutator arrangement supports consistent current transfer during repeated starts, reversals, and load changes.