Who this fits
For teams that know a catalog actuator is close electrically but not acceptable mechanically because cable path, hollow bore, length, or mounting geometry is wrong.
Custom actuator stacks built around frameless torque motors, hollow shafts, compact bearings, reducers, encoders, brakes, drivers, and cable pass-through constraints for humanoid joints that need high torque density without losing serviceable routing space.
This page should help a robotics buyer decide whether this product family belongs in the RFQ path and what evidence must be attached before a prototype or pilot order is credible.
For teams that know a catalog actuator is close electrically but not acceptable mechanically because cable path, hollow bore, length, or mounting geometry is wrong.
Hollow-bore usable space: Cable and bearing stack dependent
A frameless motor kit performs well on a bench but loses torque margin inside the robot shell
| Metric | Typical Range | Why It Matters |
|---|---|---|
| Hollow-bore usable space | Cable and bearing stack dependent | A nominal hollow shaft is not enough; the usable cable path must survive bearings, encoder, fasteners, strain relief, and assembly access. |
| Air-gap and encoder alignment | Assembly process dependent | Frameless motor performance depends on controlled rotor/stator geometry and stable encoder reference after assembly. |
| Continuous torque derating | Heat path and duty cycle dependent | High peak torque density is only useful if the housing, mounting surface, and duty cycle support the required continuous load. |
Product selection is only useful when it connects to a buyer-visible evidence path. These proof gates turn the page from a capability description into an RFQ checklist.
| Proof Gate | Evidence to Ask For |
|---|---|
| Drawing baseline | CAD package, controlled drawing revision, CTQ list, open trade-offs, NRE scope, and prototype/pilot responsibility. |
| RFQ evidence package | Buyer-side package with joint map, CAD/drawing baseline, torque-speed or force-stroke targets, validation request, pilot quantity, and report expectations. |
| Evidence library | Stage-by-stage map for CMM, FAI, actuator validation, electronics/FCT, traceability, NCR, packaging, and pilot release records. |
| Test plan checklist | Operating cycle, fixture boundary, torque-speed or force-stroke method, thermal-rise setup, backlash method, FCT, endurance, and report handoff. |
| Sample PO checklist | Drawing revision, CTQ acceptance limits, report deliverables, sample variants, buyer-supplied boundaries, change rules, packaging, and delivery records. |
| Manufacturing proof | FAI, CMM, datum checks, bearing fit, flange flatness, output runout, surface treatment, and outgoing reports. |
| Actuator validation | Torque-speed, thermal rise, backlash, noise, FCT, burn-in, traceability, nonconformance, and pilot release records. |
| BOM and sourcing control | Approved parts, restricted suppliers, substitutions, lead time, firmware boundary, harness, packaging, and second-source risk. |
A serious custom actuator inquiry should show how the selected product family moves from feasibility review into repeatable pilot manufacturing.
Review CAD, joint load, envelope, thermal boundary, cable path, and custom actuator architecture risk.
Build the first sample against defined torque-speed, fit, electrical, mechanical, and inspection assumptions.
Run thermal, backlash, noise, endurance, impact, metrology, and functional checks against the application duty cycle.
Freeze drawing/BOM revisions, evidence package, outgoing inspection, packaging, spare strategy, and repeat-build controls.
This form is prefilled with Frameless and Hollow Shaft Humanoid Actuators. Add CAD envelope, torque-speed target, duty cycle, validation needs, quantity, and schedule so the response can start with DFM questions instead of generic sample pricing.
Yes. Send OD, ID, axial length, mounting, cable routing, torque-speed, and electronics requirements so we can review whether to adapt an existing stack or create a new package.
It can overlap. QDD focuses on low reduction and backdrivability, while frameless and hollow-shaft work focuses on motor integration and cable-through packaging.
Inquiry Email
Include target torque/speed, quantity, and delivery location.
Application Engineer
+8618857971991
Talk directly about drawings, torque-speed targets, and RFQ data gaps.