Product Description:

The EB-204-A-11 is an explosion-proof brushless servomotor built by Kollmorgen as part of the EB Explosion Proof Motors series. This model is intended for Class I hazardous locations where flammable gases may be present, and it provides closed-loop rotary motion for valves, mixers, and compact conveyor drives in industrial automation cells. Its flame-tight housing helps contain ignition sources inside the motor enclosure. The housing also allows direct mounting to certified gearheads used in hazardous environments.

During continuous operation, the motor delivers 4.88 N-m of torque while drawing 2.9 ARMS of line current. At a rated supply of 230 VRMS, the back electromotive force is 100.5 VRMS/KRPM, which shows the voltage generated as speed rises. A rotor inertia of 0.000173 kg·m² supports quick acceleration without placing excessive reflected load on the driven machine. The copper windings have 9.46 ohms of DC resistance and 133 mH of phase inductance, both of which affect current rise, heat generation, and drive response. Torque sensitivity is 1.66 N-m per ampere, so torque increases predictably as current increases. Under these operating conditions, the motor can transmit 1.16 horsepower to the connected load.

For short-term demand, the unit can produce a peak torque of 12.79 N-m when the controller supplies a peak line current of 8.1 ARMS. The motor has a thermal time constant of 20 min, which allows temporary overloads before steady-state temperature is reached. Its listed mass is 8.2 kg, which helps keep installation manageable inside enclosed hazardous-duty assemblies. Electrical insulation can tolerate line potential up to 250 VRMS, which matches drives that operate above the nominal supply value. At rated speed, the shaft can sustain 4.34 N-m of torque without exceeding the intended operating limit.