DC servo motor
FAULHABER BP4
Four-pole brushless DC servomotors built for maximum power density and dynamics in 22 and 32 mm diameters.
Key specifications
| Outer diameter | 22–32 mm |
|---|---|
| Rated torque (max) | 0.158 Nm |
| Speed (max) | 34,500 rpm |
| Power (max) | 152 W |
| Voltage | 12-48 V |
Summarised in our own words from Dr. Fritz Faulhaber GmbH & Co. KG's published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1
Notes on this data
Faulhaber lists 'torque up to' per series without saying whether it is continuous or peak; stored as torque_Nm_rated_max (converted from mNm). 2264 BP4: 59 mNm, 133 W, 34,500 rpm; 3274 BP4: 158 mNm, 152 W, 16,000 rpm.
Specify Motion is not affiliated with Dr. Fritz Faulhaber GmbH & Co. KG. FAULHABER and BP4 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 FAULHABER 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.
A single 110 mm, 1.2 kW, 48 VDC servo motor giving 4 Nm at 3000 rpm for higher-power low-voltage systems, paired with Kinco FD1 and OD drives.
| Published maximum | BP4 | SMH Series Low-Voltage DC Servo Motor … |
|---|---|---|
| Rated torque | 0.16 Nm | 4 Nm meets or exceeds |
| Speed | 34,500 rpm | — |
| Power | 152 W | 1,200 W meets or exceeds |
Leadshine low-voltage PMSM servo motors from a 25 mm 33 W unit up to a 130 mm 2 kW unit, wound for 24-60 V DC buses. Fully published data covers torque to 6.4 Nm rated / 16 Nm peak, 17-bit absolute or 2500 ppr incremental encoders and IP65. Designed for ELD2, 2ELD2 and ELD3 drives.
| Published maximum | BP4 | ELVM Series Low-Voltage DC Servo Motors |
|---|---|---|
| Rated torque | 0.16 Nm | 6.4 Nm meets or exceeds |
| Peak torque | — | 16 Nm |
| Speed | 34,500 rpm | 6,000 rpm |
| Power | 152 W | 2,000 W meets or exceeds |
Low-voltage brushless DC servo motors for 48 or 96 VDC systems, with a 12-slot/10-pole design, matched to the Kinco FD1X5 drive and aimed at robotics, CNC and automated lines.
| Published maximum | BP4 | SMK Series Low-Voltage DC Servo Motors |
|---|---|---|
| Rated torque | 0.16 Nm | — |
| Speed | 34,500 rpm | — |
| Power | 152 W | 5,000 W 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.
Other dc servo motor series
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