Product Description:

The MKE118B-058-CP0-KUN is a servo motor built by Bosch Rexroth Indramat for the MKE Synchronous Motors series. It is intended for closed-loop motion in potentially explosive areas where flammable atmospheres may be present in process plants. The motor integrates an optical multi-turn absolute Hiperface encoder with M1 and 128 increments, so the drive controller retains shaft position after power cycling. This feedback arrangement supports accurate restart behavior and stable position monitoring during repeated operating cycles.

At a 60 K winding temperature rise, the unit supplies a continuous standstill torque of 28.0 Nm and sustains that output with a continuous current of 28.4 A. When rapid acceleration is required, the drive can draw up to 127.6 A RMS, producing a peak torque of 102.0 Nm. Rotor inertia of 0.01940 kg m² helps moderate speed changes in coupled loads, while a discharge capacitance of 10.3 nF helps limit voltage spikes at the terminals. A torque constant of 1.15 Nm/A and a voltage constant of 70 V per 1000 rpm indicate the current and back-EMF relationships that the inverter must follow. The motor reaches a top speed of 4500 rpm, and winding code 058 has a resistance of 2.20 Ω at 20 °C with an inductance of 0.170 mH.

Thermal operation is permitted at ambient temperatures from 0 to +40 °C, and the windings use Class 155 F insulation to withstand internal heat. The housing meets UL/CSA standards and includes a terminal box on the top side, allowing conductors to be routed upward. A shaft seal helps keep lubricant inside while resisting dust ingress, and the output shaft uses a DIN 6885 keyway for keyed couplings. The motor is supplied without a holding brake, and its mass of 45.0 kg contributes to a solid mechanical presence in fixed installations. Measured sound pressure at full load is 61.1 dB(A).