Product Description:

Pacific Scientific manufactures the Low Inertia PMDC Servomotors series, and the 55NM82-200-2 is part of the mid-sized range in that line. The motor is a brushed permanent-magnet DC unit used in industrial automation to convert armature current into proportional shaft torque for positioning tables, small conveyors, or actuator joints that must accelerate quickly and stop precisely. Its low-inertia design supports responsive motion in applications where rapid starts, reversals, and accurate stopping are important.

Under continuous duty, the armature can carry 23.2 A, producing a steady shaft output of 3.757 Nm. These values are achieved at a nominal terminal voltage of 48 VDC, which is compatible with many low-voltage servo amplifiers used on mobile or modular equipment. Intermittent demand is supported by a peak current of 55 A, and during those short bursts the motor can produce up to 13.2 Nm of torque to overcome static friction or accelerate loads. Low rotor inertia of 7.1e-5 kg·m² supports fast speed reversals because less energy is stored in the rotating mass. The armature circuit has a winding resistance of 0.65 Ω, and the torque constant provides a nearly linear relationship between commanded current and mechanical output.

Thermal and magnetic capacity are indicated by an overload factor of 3.5, meaning the motor can briefly supply several times its continuous torque when the drive applies proper time limits. At rated load, it delivers 614 W of mechanical power, which suits compact gearless axes that must remain below one kilowatt while operating from battery or other low-voltage DC buses. The back EMF slope of 17.73 V/krpm helps the drive estimate generated voltage as speed rises, supporting accurate control of commutation, regeneration, and high-speed operation.