SR3642-4822-2-7-56HC-CU Pacific Scientific
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The Pacific Scientific SR3642-4822-2-7-56HC-CU is part of their Permanent Magnet DC Motors series and features a NEMA 56C frame and a shaft diameter of 0.6250 inches. This motor delivers a continuous torque of 18.0 lb-in with a rated power of 0.5 HP and operates at a base speed of 1750 RPM. It is rated for 90 VDC and a continuous current of 4.7 Amps.
Internal Product Review
The SR3642-4822-2-7-56HC-CU is a Pacific Scientific permanent magnet DC motor designed for demanding industrial tasks. With a rated voltage of 90 VDC and a continuous torque of 18.0 lb-in, this motor delivers reliable performance in applications requiring steady output. The 56C NEMA frame and 0.5 HP rating make it a dependable choice for both new installations and replacements.
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Product Description:
The SR3642-4822-2-7-56HC-CU is a permanent-magnet DC motor manufactured by Pacific Scientific for the Permanent Magnet DC Motors series. It serves as a compact drive element that converts power from a regulated DC bus into rotary motion for conveyors, indexing mechanisms, and light machine tools that need stable torque at moderate speeds. The self-contained magnetic field eliminates the need for external excitation hardware, streamlining panel layouts and simplifying maintenance in automated equipment.
This motor is designed for a rated supply of 90 VDC, which is compatible with regenerative or SCR drives found in industrial panels. At that voltage, it provides 0.5 HP at a base speed of 1750 rpm, where the armature voltage equals the internal counter-electromotive force. The shaft can deliver a steady torque of 18.0 lb-in while drawing only 4.7 A of current, helping to keep the thermal rise moderate. For rapid acceleration or short overloads, the winding can accept up to 74.0 A, providing a broad dynamic range when used with current-limited drives and suitable fuses. A NEMA 56C face simplifies flange mounting to gearheads or pumps. The 0.625-inch shaft accepts keyed couplings without modification, allowing positive torque transfer to connected equipment.
Transient response is influenced by an armature inductance of 3.8 mH; this modest value lets current build quickly, reducing delays in closed-loop speed corrections. Copper losses are limited by an armature resistance of 0.9 Ω, which minimizes voltage drop and heat at the rated load. The electromagnetic design provides a torque constant of 4.2 lb-in/A, allowing control electronics to calculate output torque directly from the commanded current. The permanent-magnet field also maintains excitation without a separate field supply, reducing the number of electrical connections required at the motor. Its face-mounting arrangement supports direct alignment with compatible driven equipment, while the keyed shaft helps prevent slippage under changing loads.
