Mobile robot drive trains
tyred direct-drive hub motor with built-in driver and encoder — bolt-on wheel for small rovers and differential-drive robots.
Engineering inference
Waveshare
Waveshare DDSM400 Direct Drive Hub Motor
Waveshare DDSM400 direct-drive hub servo motor (outer-rotor brushless, FOC driver and encoder built in): 0.15 N·m rated at 100 rpm / 0.24 A, 0.3 N·m locked-rotor, 400 rpm no-load at 25.2 V, LIN bus, zero-backlash direct drive with tyre, Ø74.5 × 24.5 mm, 236 g.
DDSM400Development boardPrice$25.99www.waveshare.com · in stock
Buy at www.waveshare.com Overview
Motor essentials
Facts about the complete product. Unknown values remain open design questions.
- Rated voltage
- 25.2 V
- No-load speed
- 400 RPM
- Encoder
- 12-bit position sensing
A good fit for
Guidance to help you shortlist. The basis is shown for each recommendation.
No-load speed, rated performance and stall limits describe different operating points. A stall specification is not a continuous operating rating.
3D model & CAD
3D model & CAD files
Generated from the datasheet's dimensioned drawing and measured against it. Download the STEP to check fit in your own enclosure.
- Envelope (L × W × H)
- 74.5 × 74.5 × 24.5 mm
- Verification
- generated
- Envelope complete
- Yes
Torque & control
Torque, speed and control
What the joint can deliver and how the controller talks to it.
- Type
- DIRECT_DRIVE
- Rated / peak torque
- 0.15 / 0.3 N·m
- No-load speed
- 400 rpm
- Encoder
- 12-bit position sensing
- Control
- LIN
| Connector | Type |
|---|---|
| bus | 4-pin signal/power cable (LIN) |
Rated torque is continuous; peak torque is short-duration. Values with two figures (e.g. 24/48 V) are per supply voltage.
Specifications
Motor performance
No-load, rated-load and stall figures retain their separate test conditions.
- Rated voltage
- 25.2 V
- No-load speed
- 400 RPM
- Continuous rated torque
- 0.15 N·m
- Rated-load speed
- 100 RPM
- Rated current
- 0.24 A
Stall torque and current are not continuous ratings. Check the duty cycle and starting load when choosing the driver and power supply.
Thermal limits by level
Product operating conditions, chip ambient ratings, package case limits and junction maxima remain separate.
Motor body
- Product operating range
- -5 to 40 °C
Mechanical dimensions
Reported product dimensions may exclude protruding components. Unknown height does not establish a complete clearance envelope.
- Length
- 74.5 mm
- Width
- 74.5 mm
- Reported height / thickness
- 24.5 mm
Attached generated geometry is an approximate envelope. A generated outline does not establish an electrically verified PCB footprint.
Board connectors
| ID / type | Pins | Pitch | Notes |
|---|---|---|---|
| bus4-pin signal/power cable (LIN) | 4 | Unknown | — |
Complete structured record
Every available field, including details beyond the summaries. Null means the value has not been established.
Sourcing & files
Supplier offers
US / USD is the target market. Observed price and stock are separate from a delivery quote.
www.waveshare.com
US · USD
$25.99Minimum quantity unknown
- Observed stock
- in stock
- Checked
- Oct 2, 2026, 02:50 AM UTC
- Delivery estimate
- Not quoted
Observed within the last 24 hours. Confirm the current supplier quote.
Visit supplier (opens in a new tab)Delivery depends on quantity, postal code and shipping method. A dispatch statement such as “ship today” is not an arrival estimate.
Design files and references
Each source keeps its own verification status. Confirm the part revision and file contents before using it in a design.
Datasheet (opens in a new tab)
Manufacturer reference
Waveshare DDSM400 hub servo motor — product photo (opens in a new tab)
Manufacturer reference
main product image
STEP (generated from datasheet drawing) — link unavailable
Generated asset
cad_check passed
Generated envelope geometry may also exist for this record. It does not replace manufacturer CAD or a verified electrical land pattern.
Source evidence
Document provenance, retrieval dates and the field groups supported by each source.
Supports: spec.constraints.electrical.supply_voltage_max_v, spec.constraints.electrical.supply_voltage_min_v, spec.constraints.thermal.operating_temp_max_c, spec.constraints.thermal.operating_temp_min_c, spec.geometry.body_diameter_mm, spec.geometry.body_length_mm, spec.geometry.cad.bbox.height_mm, spec.geometry.cad.bbox.length_mm, spec.geometry.cad.bbox.width_mm, spec.geometry.cad.envelope_complete, spec.geometry.cad.mesh_path, spec.geometry.cad.step_path, spec.geometry.cad.verification, spec.geometry.dimensions.height_mm, spec.geometry.dimensions.length_mm, spec.geometry.dimensions.width_mm, spec.geometry.other.weight_g, spec.provides.actuator_type, spec.provides.control_interface, spec.provides.encoder, spec.provides.encoder_bits, spec.provides.features, spec.provides.integrated_driver, spec.provides.kt_nm_per_a, spec.provides.motor_type, spec.provides.no_load_speed_rpm, spec.provides.peak_torque_nm, spec.provides.rated_speed_rpm, spec.provides.rated_torque_nm, spec.usage.connectors, spec.usage.pinout, spec.usage.pinout_complete, spec.usage.requirements.other.peak_current_a, spec.usage.requirements.rated_current_a, spec.usage.requirements.rated_voltage_v
sha256 ac3c00a1505447374d4e9ce900b881581c499c3625a4ee571301f94f18e6e72e
Supports: offers
FAQ
Waveshare DDSM400 Direct Drive Hub Motor questions
What voltage powers the Waveshare DDSM400 Direct Drive Hub Motor?
Supply range 25.2–25.2 V.
How much does the Waveshare DDSM400 Direct Drive Hub Motor cost?
From $25.99 at www.waveshare.com. Prices are observed unit prices before tax and shipping.
What are the Waveshare DDSM400 Direct Drive Hub Motor dimensions?
74.5 × 74.5 × 24.5 mm. A STEP model is available for enclosure fit checks.
Where does this Waveshare DDSM400 Direct Drive Hub Motor data come from?
Every value in this record is traced to a source — 2 documents including the board and chip datasheets — with the page and table cited per value. Unknowns are left explicit, never guessed.