Product Description:

The 45VM60-020-4 low-inertia permanent-magnet DC servomotor is produced by Pacific Scientific for the Low Inertia PMDC Servomotors series. Within motion axes that demand quick acceleration and fine velocity regulation, this motor converts 30-volt direct-current supply energy into controlled rotary movement. It is intended for closed-loop industrial automation tasks such as pick-and-place heads or small positioning tables where fast start-stop behavior and repeatable torque delivery are essential.

At its rated operating point the unit accepts a supply of 30 VDC and draws a continuous armature current of 6.8 A. Under these electrical conditions the shaft reaches 3250 RPM while producing a load torque of 55 oz-in. Such performance is helped by an electrical time constant of 0.11 ms, indicating how quickly current in the 100 µH armature inductance can build in reaction to drive commands. The motor’s copper and iron losses translate into 62 W of power dissipation that must be removed through the housing, so drive designers allocate cooling air or conduction paths to keep winding temperatures within limits.

Dynamic behavior on load changes is further defined by a mechanical time constant of 0.6 ms, allowing the rotor to settle in fewer than one millisecond after a step input. For transient overloads the design supports a continuous stall capability of 60 oz-in, giving extra holding torque during static positioning without exceeding thermal limits. The rated output power of 132 W establishes how much mechanical energy can be delivered over time, while a thermal resistance of 1.61 °C/W quantifies the temperature rise per watt that the enclosure experiences. Together these parameters guide engineers in sizing amplifiers, airflow, and duty cycles so the servomotor remains within safe thermal margins during rapid cyclical service.