Product Description:

The MDC 3.30 B/SSA-0/S037 is a separately excited DC motor produced by Bosch Rexroth Indramat within the MDC DC Motors series. The unit converts electrical energy into rotary motion for conveyor sections, extruders, and other motion axes that demand steady speed under variable load. In an automation system, it works with a regulated DC drive that supervises current and speed feedback. Its construction favors compact installations where ventilation fans are undesirable.

At its rated operating point, the motor delivers a continuous shaft torque of 26 Nm while carrying 33 A of armature current. That relationship follows from a torque constant of 0.80 Nm/A, so nearly linear torque scaling is available for current-mode control. Resistive losses are governed by an armature resistance of 0.15 Ω, and current slew is limited by a winding inductance of 0.50 mH. The same electromagnetic design gives it a back electromotive force constant of 0.80 V·s/rad, which indicates the voltage required for a given speed. An internal tachogenerator supplies 0.317 V·s/rad over a 60 Ω load, allowing closed-loop velocity regulation without an external encoder. A totally enclosed non-ventilated housing keeps contaminants out and eliminates airflow paths that could disturb clean production areas.

The motor has an electrical time constant of 3.3 ms, so armature current can reach its commanded value quickly. Its mechanical time constant is 13.9 ms, reflecting rotor inertia during speed changes. For short acceleration bursts, the winding can withstand 300 A of pulse current, and commutation insulation tolerates up to 170 V when higher speed commands are required. A thermal time constant of 220 minutes means temperature rises gradually, allowing short cyclic overloads before steady-state limits are reached.