Product Description:

The 4VM82-000-6 is a permanent-magnet DC servomotor produced by Pacific Scientific for the Low Inertia PMDC Servomotors series. Using a light rotor and concentrated field, this motor supplies quick acceleration for positioning stages, pick-and-place heads, and other index-cycle axes in industrial automation. It converts armature current from a matched drive into rotary motion, while its low inertia minimizes settling time and improves loop bandwidth.

At rated speed, the armature generates a back electromotive force of 16.63 V/kRPM; the drive must therefore supply voltage above this counter-voltage to maintain current under load. The torque constant of 13.0 oz-in/A links armature current directly to output torque, allowing the controller to predict load response. For rapid indexing, the coil can accept up to 44 A of pulse current, supporting brief overloads without demagnetization. Dynamic behavior is aided by the rotor inertia of 6.1 × 10^-5 kg·m², which lets the shaft accelerate and decelerate quickly with modest control effort. Copper resistance at 25 °C is 0.45 Ω; this baseline governs I²R heating during continuous duty and guides current-limit settings.

Thermal rise changes the circuit impedance to 0.77 Ω at 155 °C, so drive algorithms can adjust the current reference to keep torque linear during extended operation. Breakaway motion is aided by the low static friction of 0.012 N·m, reducing dither requirements in closed-loop position control. The motor has a high-torque winding with extra turns per coil to maximize force at low speed without enlarging the frame. With a mass of 1.7 kg, the motor is easy to mount on small actuators, and the metric face pattern aligns with ISO gearheads and slide tables. The low friction supports smooth initial movement when the commanded position changes by a small amount. Its compact mass also limits the structural load placed on moving assemblies, while the face pattern supports direct mechanical alignment with compatible equipment.