MDC9.30B/SSA-1/S031 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MDC9.30B/SSA-1/S031 is part of the MDC DC Motors series and offers a continuous torque of 27 Newton-meters with a max speed of 1300 rpm. It has an armature current of 33 Amps and a torque constant of 1.14 Newton-meters per Amp. The brake holds 20 Newton-meters at 24 VDC, and peak pulse current reaches 250 Amps.
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Product Description:
Bosch Rexroth Indramat builds the MDC9.30B/SSA-1/S031 as part of the MDC DC Motors series. This DC motor supplies controlled torque to conveyors and positioning modules that require precise speed regulation from a DC source. Integrated tacho feedback provides a linear 33 V/kRPM signal for speed loops, while an electromagnetic holding brake secures the shaft when the drive is disabled. This arrangement allows the controller to monitor speed continuously and apply stable correction when the load changes. These features make the motor suitable for vertically oriented axes or indexing tables that require quick stopping and reliable static holding.
The motor delivers a continuous torque of 27 N·m at its rated armature current of 33 A. A torque constant of 1.14 N·m/A links output torque directly to current command values, which supports current-mode drive tuning. That relationship helps the drive convert current demand into predictable shaft output. Maximum rated speed is 1300 rpm, and the drive electronics may supply up to 250 A in short pulses for acceleration or shock-load recovery. Armature resistance is 0.195 Ω and armature inductance is 1.20 mH, which results in a 6.15 ms electrical time constant that governs current rise. The 8.5 ms mechanical time constant reflects rotor acceleration behavior, while a back-EMF constant of 119.4 V/1000 rpm indicates generated voltage during motoring or regeneration.
An integral holding brake supplies 20 N·m of static torque and is energized with 24 VDC through a winding that measures 38 Ω. The drive system must limit the armature circuit to the motor’s 230 V peak rating to avoid commutator flashover. Rotor inertia is kept to 0.057 kg·m², supporting low-speed stability with responsive starts and stops. Because the brake is separate from the armature circuit, the shaft can remain locked after drive power is removed. This helps the motor hold position at rest without relying only on drive-produced torque.
