Product Description:

Pacific Scientific manufactures the 2VM61-020-2 as part of its Low Inertia PMDC Servomotors series. This permanent-magnet DC motor is intended for compact industrial axes where tight speed regulation and rapid acceleration are required. Its low rotor inertia lets motion controllers command frequent velocity changes with minimal overshoot, making the motor suitable for electronic assembly stations, small conveyors, and other light-duty positioning tasks. That operating profile is common in benchtop automation and small transfer mechanisms where quick starts and stops matter more than high continuous torque.

The motor is designed for a supply of 24 V and draws a continuous armature current of 3.8 A while delivering a rated shaft speed of 4475 rpm. At that operating point, it produces 0.113 Nm of torque and a mechanical output of 47 W. A torque constant of 0.033 Nm/A links current to torque generation, and a back-EMF constant of 3.4 V/1000 rpm indicates the generated voltage as speed rises. The 1.59 Ω resistance at 25 °C limits steady-state current, while a rotor inductance of 0.265 mH shapes the armature's electrical response. These electrical constants help the drive respond predictably as load and speed change through the usable range. With a no-load speed of 6450 rpm, the motor provides reserve speed above the rated point for closed-loop control.

The motor allows a maximum pulse current of 19 A for short transients, producing up to 0.63 Nm of peak torque during rapid indexing or breakaway events. The armature can safely reach 9000 rpm, and its electrical time constant is only 0.17 ms, so current settles very quickly after a new command. A 5.0 ms mechanical time constant and a rotor inertia of 3.3 × 10⁻⁶ kg·m² support fast acceleration while keeping reflected load on the transmission low. These transient limits are useful when the axis must overcome static friction at startup or reverse direction over short travel distances.