Bosch Rexroth CS351E-D
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The Bosch Rexroth MDD071B-N-030-N2M-095GL0 is a permanent-magnet digital AC servo motor for dynamic feed, positioning and handling axes in established Indramat drive systems. This exact version carries material number R911249788 and belongs to frame size MDD071 with motor length B. Its rated speed is 3,000 min⁻¹. With natural convection, the Bosch Rexroth project planning manual specifies 4.4 Nm continuous standstill torque and 7.3 A continuous current; with surface cooling, 6.6 Nm is documented. The theoretical maximum torque is 13.6 Nm and the maximum current is 32.8 A. Further data for controller and axis sizing include a rotor moment of inertia of 8.9 × 10⁻⁴ kgm², a torque constant of 0.60 Nm/A, 1.60 Ω winding resistance and 9.4 mH winding inductance. The thermal time constant without surface cooling is 45 minutes; motor mass without holding brake and blower is 8.8 kg. The N2M feature identifies digital servo feedback with an integrated multiturn absolute encoder. This encoder supplies position and motor data to the matching digital drive controller and supports reproducible axis assignment after power-up. This version has a plain shaft and no holding brake. IP65 protection and insulation class F support operation in industrial machinery environments. The permissible ambient temperature range is 0 to +45 °C; −20 to +80 °C is specified for storage and transport. For replacement, the complete type code, material number, rated speed, feedback version, centering diameter, shaft, connector orientation and brake version must match the installed axis exactly. Similar MDD071B variants with a different speed, encoder, keyed shaft or holding brake are not automatically interchangeable. Precise matching reduces commissioning risks and supports targeted spare-parts supply for legacy Rexroth and Indramat machines.
| Manufacturer | Bosch Rexroth |
|---|---|
| Product series | MDD Digital AC Servo Motors |
| Manufacturer / order / identification number | MDD071B-N-030-N2M-095GL0 |
| Material number | R911249788 |
| Device type | Permanent-magnet digital AC servo motor |
| Rated speed | 3,000 min⁻¹ |
| Continuous standstill torque | 4.4 Nm with natural convection |
| Continuous standstill current | 7.3 A with natural convection |
| Theoretical maximum torque | 13.6 Nm |
| Maximum current | 32.8 A |
| Rotor moment of inertia | 8.9 × 10⁻⁴ kgm² |
| Torque constant at 20 °C | 0.60 Nm/A |
| Winding resistance at 20 °C | 1.60 Ω |
| Winding inductance | 9.4 mH |
| Thermal time constant | 45 min without surface cooling |
| Motor mass | 8.8 kg without holding brake and blower |
| Degree of protection | IP65 |
| Feedback | Digital servo feedback with integrated multiturn absolute encoder |
| Output shaft | Plain shaft |
| Holding brake | Without |
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At 3,000 min⁻¹, the naturally convected motor reaches 4.4 Nm continuous standstill torque and 7.3 A continuous current; 13.6 Nm theoretical maximum torque and 32.8 A maximum current are documented.
The complete type code, material number R911249788, rated speed, multiturn feedback, centering, shaft, connector orientation and the version without a holding brake must match the installed axis exactly.
Yes, we provide a 14-day functional guarantee for used items. This means the component must be operational when received.
Please note that the guarantee only applies when the warranty seal is undamaged.
If a defect occurs within 14 calendar days, please contact us in writing. Subject to availability, we will provide a replacement or refund the full purchase price after return.
Further details are provided in the terms and conditions supplied with your quotation.
We generally dispatch immediately - in many cases on the same working day. For particularly urgent requirements or machine downtime, we find a suitable solution as quickly as possible and provide a specific delivery window on request.
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As a rule, we offer purchase on account for all customers. In individual cases, such as new customers or particularly high-value components, we may agree advance payment. This decision is made individually and communicated transparently.
Because we sell exclusively to business customers (B2B), there is no general right of return and no consumer right of withdrawal.
Please note that returns of functioning goods are generally excluded. In justified exceptional cases, we can assess an individual solution, but this is not the standard procedure.
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Yes, we also purchase automation components, such as frequency inverters, PLC assemblies, panels, servo motors and CPUs. Components from Siemens, Lenze, Schneider Electric, Control Techniques or Heidenhain are especially sought after, and other brands are also possible.
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