Specialist motor selection
Three specialist motor architectures, separated clearly by commutation method, dynamic performance and the control system required.
Choose by engineering priority
Start with the operating characteristic that matters most. Each route leads to a focused technical page with its own product range and configuration options.
Smooth, quiet brushless motion
Electronically commutated, slot-free motor platforms for smooth torque, low acoustic noise and long-life precision motion.
Very low rotor inertia
Coreless brushless construction combines rapid dynamic response with electronic commutation for demanding servo and continuous-duty applications.
Simple, responsive DC control
Ironless armature motors with graphite-brush commutation for compact equipment requiring low inertia, linear output and straightforward DC control.
At-a-glance selection
The three routes remain separate so visitors can identify the correct technology without working through a large combined product table.
Strongest fitQuiet, low-cogging continuous motion
Control routeElectronic controller
Strongest fitFastest response with long brushless life
Control routeElectronic controller and feedback as required
Strongest fitCompact response with simple DC control
Control routeDC supply or PWM controller
Technical data presentation
Standard frame platforms are configured around the required speed–torque operating point. Final rated values are confirmed against motor length, winding, thermal conditions and duty cycle.
| Motor technology | Frame range | Voltage | Speed rating | Torque rating | Control route |
|---|---|---|---|---|---|
| Graphite brush coreless | 16 · 22 · 26 · 32 mm | 12 or 24 VDC | Application-matched | Application-matched | DC or PWM |
| Slotless brushless | 16–32 mm platforms | 12 or 24 VDC | Application-matched | Application-matched | Electronic commutation |
Rating basis: Published values are indicative selection data. Unless otherwise agreed, speed and torque may vary by ±10%. Continuous, peak, stall and no-load values remain separately identified in the final approved specification.
Internal technical benchmark
Published FAULHABER and Portescap data has been checked against motor volume and the relationship between speed, torque and mechanical power. These figures are reference envelopes for comparing equivalent SDT diameter, length, voltage, thermal mounting and duty.
| Technology | Reference size | Published speed | Torque capability | Continuous output | Power density |
|---|---|---|---|---|---|
| Graphite brush | 26 × 42–68 mm | 7,000–10,000 rpm | 31.3–71.2 mNm | 22.5–73.4 W | 0.75–2.03 W/cm³ |
| Graphite brush | 32 × 42–72 mm | 6,000–7,000 rpm | 41.6–125 mNm | 25.3–77.8 W | 0.75–1.34 W/cm³ |
| Slotless BLDC | 16 × 36–52 mm | 40,000–73,000 rpm | 7.5–16.1 mNm | 27.5–66 W | 3.54–6.31 W/cm³ |
| Slotless BLDC | 22 × 35–60 mm | 38,000–60,000 rpm | 14.3–50.5 mNm | 56–180 W | 4.21–7.89 W/cm³ |
| Slotless BLDC | 30 × 64–90 mm* | 25,000–30,000 rpm | 137–225 mNm | 187–244 W | 3.84–4.13 W/cm³ |
Maximum speed, maximum torque and maximum power are separate operating limits and must not be treated as simultaneous. An SDT platform is classed as equivalent only when its verified result is within ±10% under comparable conditions.
*30 mm is the nearest published cylindrical competitor platform for checking the proposed 32 mm SDT range.
Established platforms · application-specific performance
The 16, 22, 26 and 32 mm frame sizes are established miniature-motor platforms with well-understood operating envelopes. SDT uses these recognised industry products as engineering benchmarks, then configures the winding, magnetic circuit, commutation, bearings, thermal design, feedback and control around the customer's actual duty.
This enables graphite-brush coreless and slotless brushless solutions to target the required torque, speed, power density, efficiency, service life and control performance—without implying that frame diameter alone determines the final rating.
Application duty, envelope, voltage and control requirements agreed.
The motor architecture and preliminary performance data are reviewed.
Winding, interfaces, feedback and drive configuration are engineered.
Samples and validation results are checked against the agreed duty.
Final drawings and production specifications are approved for release.
Customer approval remains visible throughout. Requirements, preliminary data, drawings, samples, validation results and final production specifications are reviewed at defined stages before the product advances.
Application-led selection
Share the speed, torque, duty, envelope, life and control requirements and SDT will identify the suitable motor and drive architecture.
