4VM81-220-6 by Pacific Scientific

The Pacific Scientific 4VM81-220-6 is a high-performance unit in the Low Inertia PMDC Servomotors series, engineered for precise motion control in industrial automation. It features a Rated Torque of 0.56 Nm and a Rated Speed of 3100 RPM, delivering rapid response and consistent performance under demanding conditions. With a Rated Voltage of 30 Volts, this servomotor is designed for straightforward integration into systems requiring stable DC power inputs and accurate speed regulation.

In detailed technical terms, the 4VM81-220-6 offers a Torque Constant of 0.041 Nm/Amp and a Back Emf Constant of 4.29 V/kRPM, ensuring predictable linear behavior between electrical input and mechanical output. The Electrical Time Constant of 0.13 ms and Mechanical Time Constant of 1.7 ms underline its ability to respond quickly to control signals, while the Rotor Inductance of 110 microhenries and Viscous Damping Coefficient of 0.005 Nm/kRPM contribute to smooth operation across the speed range. Maximum pulse currents reach 46 Amps, supported by a continuous stall torque rating of 0.586 Nm and a continuous power dissipation capability of 275 Watts for reliable duty-cycle performance.

Beyond core metrics, this servomotor’s thermal characteristics—highlighted by a Thermal Resistance of 0.47 °C/W—ensure efficient heat management during extended runs. The Rated Current of 15.2 Amps and Rated Power Output of 181 Watts balance power delivery with energy efficiency, minimizing heat buildup in compact installations. Compatibility with standard DC drives and controllers, combined with rugged internal damping and low inertia design, makes the 4VM81-220-6 exceptionally durable in industrial environments. Certified to industry norms for PMDC servomotors, it offers low maintenance and long service life, ultimately reducing downtime and boosting productivity in automation applications.