SD-B3.031.030-04.004 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SD-B3.031.030-04.004 is a brushless servo motor from the SD Magnet Motors series, featuring a flange size of 116 mm and a shaft measuring 19 by 40 mm. It uses a ferrite magnet and operates at a nominal speed of 3000 rpm, providing a holding torque of 4.0 Nm. This model comes with a disk brake and a built-in ROD 426.014 encoder with a resolution of 2500 pulses per revolution.
Internal Product Review
The SD-B3.031.030-04.004 is a brushless servo motor with basic equipment and a disk brake. Nominal speed of 3000 rpm and torque at standstill of 3.1 Nm support responsive motion control and stable servo performance. Built-in encoder resolution of 2500 pulses/rev adds accurate position feedback, making the unit an excellent fit for precise automation axes.
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Product Description:
The SD-B3.031.030-04.004 is a brushless servo motor manufactured by Bosch Rexroth Indramat for the SD Magnet Motors series. Designed as an integral drive element, this unit converts electrical energy into precisely controlled mechanical rotation, allowing automated machinery to position loads, follow velocity profiles, or sustain synchronized motion with the drive controller. In assembly lines, pick-and-place equipment, and compact handling axes, the motor’s electronic commutation, permanent-magnet rotor, and integrated feedback enable closed-loop operation without the mechanical wear associated with brush-type designs. This operating principle supports accurate starts, stops, and repeatable motion in machines that require responsive axis control.
Its square mounting interface follows a 116 mm flange pattern, so the housing bolts directly to gearboxes or frames without adapter plates. Once energized, the rotor can generate 3.1 Nm of torque at standstill, providing useful holding torque for indexing tables during dwell periods. Under continuous operation, the motor reaches a rated velocity of 3000 rpm, giving a balance between speed range and thermal limits for medium-inertia loads. The rotor uses Ferrite magnets, a material choice that reduces rare-earth content while maintaining the magnetic flux needed for servo performance. Mechanical coupling is provided by a shaft that measures Ø19 × 40 mm, supporting standard keyed hubs or clamp collars. This combination of mounting, torque, speed, and shaft dimensions makes the motor suitable for compact drive trains that need stable torque delivery and controlled acceleration.
For emergency stops and vertical axes, a spring-applied brake supplies 4.0 Nm of holding torque, clamping the shaft whenever power is removed. Position feedback is delivered by an optical encoder that provides 2500 pulses/rev, allowing drives to resolve motion down to fractions of a degree. The motor is supplied as Basic equipment with disk brake, so no external brake module is required for brake-equipped installations. The Built-in encoder ROD 426.014 special version includes a factory-aligned sensor that simplifies setup with Rexroth controllers. Together, the brake and encoder support controlled stopping, position retention, and accurate motion correction during normal machine operation.
