Product Description:

The 61VM82-220-5 is a permanent-magnet DC servomotor manufactured by Pacific Scientific as part of the Low Inertia PMDC Servomotors series. It is designed for closed-loop motion axes in assembly cells, inspection tables, and small gantries. The motor converts bus voltage into proportional shaft torque, supporting fast reversals and tight following-error limits thanks to its minimized rotor mass.

At its nominal operating point, the motor accepts a supply of 48 V and draws 7.0 A, delivering a shaft speed of 2100 rpm and a continuous torque of 1.08 Nm. These values correspond to 237 W of mechanical output, so the device matches fractional-horsepower gearboxes and timing pulleys. The armature winding has an inductance of 0.50 mH, letting current rise quickly when a drive applies a step voltage, while the torque constant of 0.164 Nm/A links commanded current to produced torque for controller tuning. With a terminal resistance of 1.23 Ω at 25 °C and 1.67 Ω at 155 °C, copper heating effects remain predictable. The thermal resistance of 1.3 K/W relates winding losses to temperature rise under continuous duty, and the rotor inertia of 26.9 × 10⁻⁶ kg·m² keeps acceleration times short.

For transient moves, the motor tolerates a peak shaft velocity of 4000 rpm, and drives may inject up to 40 A for pulse intervals to generate 6.56 Nm of starting torque. These overload capabilities help the shaft reach its no-load speed of 2700 rpm rapidly while maintaining control stability. During free running, the generated back electromotive force scales at 16.26 V/1000 rpm, assisting drive designers in setting commutation voltage margins and regeneration limits. Heat buildup remains manageable because the winding dissipates heat through the thermal path, allowing continuous duty cycles without exceeding insulation limits.