Product Description:

The 55NM82-004-5 is a servo motor supplied by Pacific Scientific and assigned to the Low Inertia PMDC Servomotors series. It is engineered for closed-loop motion control where quick response and consistent torque are needed on automated assembly lines, electronic component insertion stations, and similar equipment. By combining a compact rotor with low mechanical inertia, the unit minimizes overshoot during start-stop duty cycles and simplifies mechanical design when coupled directly to lead screws, timing belts, or lightweight load wheels. This design approach also favors reduced settling times in precision indexing applications.

The feedback subsystem relies on an incremental optical encoder whose flutter is limited to 1.0% peak-to-peak under rated speed, keeping positional variance inside typical servo bandwidths. A miniature code wheel contributes just 0.00001 oz-in-s² of additional inertia, preserving the motor’s rapid acceleration profile. The encoder electronics draw 5 Vdc ±5% @ 150 mA, allowing direct connection to most digital drives without auxiliary supplies. An integrated LED serves as the illumination source for the photodetectors, providing long service life and stable pulse amplitude. Rotor flux is established by Alnico V-7 magnets, a material choice that maintains residual magnetism over wide temperature swings and eliminates the need for rare-earth elements in this frame size. Rated current and voltage are factory assigned to match each unit’s individual winding resistance and torque constant.

The motor is identified by the drive as a PMDC servomotor, and its position feedback stream is generated by a square dual-channel encoder with no zero index, enabling quadrature decoding while omitting an absolute home pulse. Cooling requirements remain minimal because the housing uses no forced-air cooling. Speed monitoring through a tachogenerator is unnecessary because an analog tachometer is not attached.