Low Inertia PMDC servomotors are permanent-magnet DC servo motors built for very fast incremental motion, combining low rotor inertia with high pulse-torque capability to deliver rapid acceleration, precise start/stop sequences, and tight speed regulation.
Their basket-style hollow-rotor construction eliminates rotating iron and uses a very small air gap, which helps produce a high torque-to-inertia ratio and very short electrical and mechanical time constants. The series is designed to tolerate short-duration overloads with pulse torque up to about seven times rated torque, and performance can be extended with forced-air cooling for higher continuous capability in demanding duty cycles. Feedback options support closed-loop servo control using analog tachometers with multiple voltage constants and optical encoder choices with line counts from roughly 50 to 2500 lines, including single/dual channel outputs, sine or square wave formats, and optional index. The motors use a brushed commutation system with long-life, field-replaceable brushes and are available with flexible mounting and shaft options so they can be matched to applications that need very responsive positioning and repeatable speed control.
