Product Description:

The 4N63-000-2 is a permanent-magnet DC servomotor manufactured by Pacific Scientific for the Low Inertia PMDC Servomotors series. In industrial automation it supplies tightly regulated rotation to indexing tables, miniature actuators, and light conveyors that demand fast settling times and repeatable torque. By combining a compact frame with neodymium magnet material and a very light armature, the motor changes speed quickly, letting motion controllers execute short, precise moves without overshoot.

Its electrical operating point is at 36 V, where the armature draws a rated 6.7 A to produce a continuous shaft output of 168 W. Under this condition the motor spins at 3250 rpm and develops 0.49 Nm of running torque, matching small-to-medium belt or gear reductions. During rapid acceleration the drive can supply a peak armature current of 46 A, permitting brief torque surges without exceeding the copper temperature rise associated with the 1.81 °C/W thermal path. Because the housing dissipates a continuous 72 W with no forced-air cooling, the unit can be mounted in compact enclosures without additional blowers, provided ambient temperatures remain within standard equipment limits. Terminal resistance of 0.89 Ω and a torque constant of 0.090 Nm/A help with matching amplifier selection for accurate current-mode control.

A rotor inertia of 6.3 × 10⁻⁶ kg·m² gives the servomotor a low mechanical time constant so it tracks command changes closely and minimizes energy stored in the load. The neodymium field produces a back electromotive force of 9.47 V/krpm, supplying predictable voltage feedback that assists regenerative braking algorithms. When the shaft is locked, the armature can hold 0.544 Nm continuously without thermal overload, which is useful for axes that dwell under load. Overall mass is 2.2 kg, allowing direct mounting on lightweight frames while still limiting vibration. Frequent start-stop duty cycles remain practical because the low inertia reduces stored energy and the motor maintains stable thermal behavior during repeated motion changes.