Housed direct-drive motor
Baumüller DST2 high-torque motors
Housed synchronous high-torque motors for direct drive in five sizes (135 to 400), nominal torque up to 18,600 Nm and peak up to 31,600 Nm, up to 530 kW, water- or oil-cooled, IP54.
Key specifications
| Ingress protection | IP54 |
|---|---|
| Rated torque (max) | 18,600 Nm |
| Peak torque (max) | 31,600 Nm |
| Speed (max) | 2,000 rpm |
| Power (max) | 530,000 W |
| Sizes | 135, 200, 260, 315, 400 |
| Cooling | water or oil |
Summarised in our own words from Baumüller Nürnberg GmbH (family-run Baumüller Group)'s published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1 · Source 2
Notes on this data
Sizes 315 and 400 have Lloyd's Register certification for shipbuilding (2015 milestone).
Specify Motion is not affiliated with Baumüller Nürnberg GmbH (family-run Baumüller Group). Baumüller and DST2 high-torque motors are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Alternatives that meet or exceed these figures
Engineers often come to us with a Baumüller part number and leave with an alternative that is easier to source, quicker to deliver or a better fit for the machine. These 3 series from our supply network are the closest match on published figures.
Housed iron-core direct drive motors with larger through-holes than ADR-A, 110-220 mm frames, optical encoder feedback.
| Published maximum | DST2 high-torque motors | ADR-B |
|---|---|---|
| Peak torque | 31,600 Nm | — |
| Speed | 2,000 rpm | 2,000 rpm meets or exceeds |
Housed iron-core direct drive rotary motors with bearings and optical encoder, 110-360 mm frames, up to about 1 kNm peak at 600 VDC.
| Published maximum | DST2 high-torque motors | ADR-A |
|---|---|---|
| Continuous torque | — | 407.2 Nm |
| Peak torque | 31,600 Nm | 1,017.9 Nm |
| Speed | 2,000 rpm | 2,000 rpm meets or exceeds |
Low-profile housed iron-core direct drive motors with large centre holes and incremental encoders, 80-400 mm frames.
| Published maximum | DST2 high-torque motors | AXD |
|---|---|---|
| Continuous torque | — | 250.6 Nm |
| Peak torque | 31,600 Nm | 648.9 Nm |
| Speed | 2,000 rpm | 3,000 rpm meets or exceeds |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
What a housed direct-drive motor is
A housed direct-drive motor is a high-pole-count permanent-magnet torque motor supplied in a complete housing with its own bearings, typically a precision cross-roller or similar bearing, and a high-resolution encoder. The load bolts directly onto the rotor face or shaft, with no gearbox or belt between motor and load. Many designs have a large hollow centre. They are run by a servo drive and provide high torque at low speed with very high stiffness and accuracy.
When engineers choose a housed direct-drive motor
Choose a housed direct-drive motor for rotary tables, indexers and turntables that need high accuracy, fast indexing and no backlash, without the integration effort of a frameless motor. It is ready to mount. The trade-offs are cost and size: direct drive needs a large motor for high torque, and the bearing and encoder are set by the range. Where torque needs are high and accuracy moderate, a servo with a precision gearbox may be cheaper.
How to specify the Baumüller DST2 high-torque motors
Send these with your enquiry and an engineer can confirm the right DST2 high-torque motors variant or an equivalent:
- Continuous and peak torque (Nm)
- Speed (rpm)
- Load inertia and moment load (kgm², Nm)
- Axial and radial load capacity (N)
- Encoder type and resolution
- Through-hole diameter (mm)
- Bus voltage and drive compatibility
Common mistakes to avoid
- Ignoring moment loads from offset tooling
- Mismatching encoder interface and drive
- Overlooking thermal effects on accuracy
- Expecting high torque without a large frame
Baumüller DST2 high-torque motors: frequently asked questions
What is the Baumüller DST2 high-torque motors?
Housed synchronous high-torque motors for direct drive in five sizes (135 to 400), nominal torque up to 18,600 Nm and peak up to 31,600 Nm, up to 530 kW, water- or oil-cooled, IP54. Published series figures include rated torque 18,600 Nm, peak torque 31,600 Nm, speed 2,000 rpm, power 530,000 W. It is made by Baumüller Nürnberg GmbH (family-run Baumüller Group); Specify Motion can help source it or propose an equivalent.
Who makes the Baumüller DST2 high-torque motors?
The Baumüller DST2 high-torque motors is made by Baumüller (Baumüller Nürnberg GmbH (family-run Baumüller Group)) and is listed here for engineers comparing options. Specify Motion is not affiliated with Baumüller Nürnberg GmbH (family-run Baumüller Group); brand names are used only to identify the product.
What is the rated torque of the Baumüller DST2 high-torque motors?
The published series maximum rated torque is 18,600 Nm. Individual models and sizes in the DST2 high-torque motors range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Baumüller DST2 high-torque motors?
Yes. On published figures, Akribis Systems ADR-B and Akribis Systems ADR-A are the closest match from our supply network. An engineer confirms the fit against your application before recommending anything.
When should I choose a direct-drive rotary table instead of a geared one?
Choose direct drive when you need high accuracy, fast settling, no backlash and low maintenance, especially for indexing and inspection. Choose a geared solution where torque requirements are high and cost must be controlled. Direct-drive motors are larger for the same torque.
Do housed direct-drive motors need a brake?
Not always. Horizontal tables often hold position under servo control. Vertical axes, unbalanced loads or safety requirements may need a brake or clamp. The machine's risk assessment determines whether a holding brake or clamp is required, and brake or clamp options vary between ranges, so confirm availability early in the design.
Further reading: How to select a frameless torque motor · Frameless and torque motors
Other housed direct-drive motor series
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