Decision in brief
Match the assembly boundary
Include the motor, transmission, feedback, drive and test work on both sides. An integrated product and a frameless kit cover different deliverables.
Let the quotes set the crossover
A lower unit quote can be offset by qualification and rework. No verified country-wide savings rate is available in this review.
See the illustrative calculationRetain control of sensitive interfaces
Limit disclosures and require revision records. Local assembly is a possible disclosure boundary, not a guarantee against copying.
Compare the same deliverable
Here, “local” means a machining and assembly route near the buyer; it does not imply domestic origin for every component. China suppliers can offer catalog modules, custom assemblies or parts. These are different scopes, so the RFQ must name the deliverable.
Swipe the table sideways to compare all columns.
| Boundary | Integrated supplier route | Local machining + assembly route |
|---|---|---|
| Hardware | List included motor, reducer, bearings, encoder, drive, cables and any brake; confirm omissions. | Quote housings and shafts plus purchased components. Name the party responsible for assembly. |
| Engineering | Check fit, cooling, firmware access and permitted modifications against the exact catalog revision. | Budget tolerance stack-up, component selection, fixtures, assembly and controller commissioning. |
| Acceptance | Require module tests and then qualify it in your mounting and load cycle. | Qualify the assembled joint; dimensional inspection alone does not show loaded performance. |
| Delivery | Request stock/build status, transport terms and an accepted-sample milestone. | Include the longest component lead time, assembly capacity and any retest loop. |
| Decision boundary | Consider when the documented module meets the specification and supplier terms are acceptable. | Consider when geometry is still changing and your team or integrator can own the complete joint. |
1. Freeze the requirement
Duty cycle, load path and interfaces
2. Quote both routes
Same complete-joint boundary
3. Qualify samples
Same fixtures and acceptance limits
4. Release a pilot
Revision control and return terms
Verified facts, useful limits and unknowns
Sources were checked on 2026-09-21. Manufacturer documentation supports the named product or service only. It is not independent proof of reliability or a representative market survey.
Swipe the table sideways to compare all columns.
| Evidence | Verified public statement | Limit for the sourcing decision |
|---|---|---|
| AK80-9 V3.0 KV100 | 9:1 planetary reduction; 9 Nm rated and 22 Nm peak torque; integrated motor, drive and encoder. | Vendor ratings. Confirm cooling, duty cycle, peak duration and revision before applying them to a humanoid joint. |
| Frameless motor boundary | Rotor and stator are supplied without housing, bearings, shaft or feedback device. | A motor-kit or CNC-part price omits part of the complete-joint cost. |
| Machining capability | Eligible parts advertised in as fast as one day. | Best-case service claim; not a promise for custom actuator assembly or delivered qualification samples. |
| Trade-secret measures | Confidentiality agreements and measures restricting access help maintain secrecy. | No guarantee against independent development, reverse engineering or a particular contractual dispute. |
| Matched cost and lifetime comparison | Unknown: no equivalent China/local quotations or matched endurance results in this review. | Do not infer savings percentages, country-level quality rankings or failure rates. Collect the missing evidence in the RFQ and pilot. |
Actuator total cost comparison: a worked example
Illustrative USD scenario — not market prices or a supplier quote
For one joint design and one release period, let Q be the number of accepted joints. F is one-time engineering, tooling and qualification cost. v is the variable cost per accepted joint, including hardware, assembly, inbound freight, nonrecoverable duties/taxes, inspection and an explicit rework/service allowance. Use the same scope and currency on both routes.
Total cost = F + Q × v
Cost per accepted joint = F / Q + v
Swipe the table sideways to compare all columns.
| Input or result | Integrated supplier route | Local assembly route |
|---|---|---|
| Assumed F | $9,000 | $3,000 |
| Assumed v | $640 / accepted joint | $740 / accepted joint |
| Q = 20 | $21,800 total; $1,090 / joint | $17,800 total; $890 / joint |
| Q = 100 | $73,000 total; $730 / joint | $77,000 total; $770 / joint |
| Q = 500 | $329,000 total; $658 / joint | $373,000 total; $746 / joint |
Base-case crossover: 60 joints
($9,000 − $3,000) / ($740 − $640) = 60. At 60 accepted joints both totals are $47,400. Under these assumptions only, the supplier route becomes cheaper above 60 joints.
Sensitivity: extra $80 per supplier joint
If transport, inspection and service increase supplier v to $720, the crossover rises to 300 joints. At $740 or above, its higher fixed cost is never recovered within this linear model.
Replace every assumption with dated quotations. Model each quantity tier separately when prices, tooling or capacity change. Financing, exchange-rate changes and deployment downtime are excluded from this simple example; add them separately if material. Specify the destination and delivery terms before assigning import costs; no tariff rate is assumed here.
Use the sample RFQ package to collect comparable quotesWhat a sample must demonstrate
The following is a proposed acceptance checklist, not a certification standard. Set limits from the robot requirements before testing; leave a gate open if the evidence is missing.
Swipe the table sideways to compare all columns.
| Gate | Evidence to request or measure | Hold the decision when… |
|---|---|---|
| Thermal and torque-speed | Load cycle, bus voltage, speed, peak duration, mounting/cooling, ambient and winding or case temperature. | Only a peak number or an unloaded demonstration is available. |
| Mechanical behavior | Output bearing loads, runout, torsional stiffness and lost motion under a defined reversal load; measure before/after cycling. | The method, fixture or load boundary differs between candidates. |
| Control integration | Protocol document, connector pinout, firmware revision, command/feedback timing, homing and communication-loss response. | A shared bus name is the only evidence of host compatibility. |
| Traceability and endurance | Serial and revision-linked records, test duration/cycles, load spectrum, lubrication, failure criteria and observed drift. | Life is claimed without the conditions and results behind it. |
| Pilot delivery and service | First-article approval, inspection plan, change notification, replacement route and written lead-time milestones. | A substitution or manufacturing revision can be shipped without review. |
Build the measurement plan with the actuator test-plan checklist and backlash acceptance method.
Method, scope and limits
How the recommendation is derived
First normalize the assembly boundary using the component documentation. Then compare quotations and qualification evidence for the same requirement. The decision rules, cost assumptions and workflow are editorial engineering synthesis, not observed averages.
When this report is insufficient
Public sources here do not establish supplier capacity, your negotiated price, delivery date or field life. Specialized safety, regulated-use and export requirements need a project-specific review. No vendor is approved by this report.
Commercial context: Magatom Dynamics Co., Ltd. publishes Custom Humanoid Actuator (CHA) and accepts sourcing inquiries. Named third-party examples establish technical scope; they are not a supplier ranking or an independent audit.
Review policy: recheck this report every six months, or sooner when a cited product revision or source changes. For component selection, use the humanoid actuator selection guide and the brushless motor versus torque motor comparison.
Three ways to use the comparison
Hypothetical planning scenarios, not customer case studies or measured savings.
Changing joint geometry during R&D
- Premise:
- The mounting envelope and load path are still changing; a local integrator is available.
- Process:
- Quote local housings and purchased components alongside a stocked module with an adapter. Compare total time to the next loaded test.
- Decision outcome:
- Choose the route that supports the next experiment with acceptable rework. Low quantity alone does not rule out an imported catalog module.
Frozen design entering a pilot
- Premise:
- The joint specification is stable, but repeat-order quality is not yet demonstrated.
- Process:
- Qualify sample modules against the local build, use matched cost boundaries, and approve a pilot with serial-linked reports.
- Decision outcome:
- Release the supplier route only if qualification and cost/lead-time objectives are met. A lower invoice price alone does not close the decision.
Proprietary mechanism with catalog subcomponents
- Premise:
- A novel linkage or control method is sensitive while the motor or reducer can be purchased.
- Process:
- Split the required drawings by supplier, source catalog components where suitable, and integrate locally with controlled access.
- Decision outcome:
- A hybrid route may reduce disclosure while retaining design flexibility. It adds interface and assembly responsibility; include those costs.
Risks, triggers and safeguards
Swipe the table sideways to compare all columns.
| Risk | Trigger / consequence | Practical safeguard |
|---|---|---|
| Supplier lock-in | A module revision changes geometry, firmware behavior or availability. | Keep an interface-control document and revision-change terms. Requalify substitutes mechanically, thermally and electrically. |
| Integration underestimated | A local parts budget omits drive tuning, bearing fits or assembly fixtures. | Assign a joint-level integration owner and quote the complete acceptance process. |
| Confidentiality exposure | Full CAD or firmware is shared with parties that do not need it. | Use scoped disclosures, access records and reviewed contracts. WIPO explains the limits; neither country nor assembly location guarantees protection. |
| Delivery or field replacement delay | A failed batch, customs delay or distant return process interrupts deployment. | Obtain written milestones and replacement terms; size spares from failure/replenishment assumptions and update after the pilot. |
| Scaling or quality drift | A larger order changes processes, components or inspection coverage. | Approve the manufacturing revision and pilot evidence before release; review capacity and quality records for either route. |
Questions buyers need answered
Cost and ordering
How much cheaper is a Chinese actuator supplier?
There is no matched quote dataset here that establishes a country-wide saving. Compare accepted, integrated joints at the same quantity and duty cycle. The worked example below the evidence table illustrates the calculation; its inputs are assumptions, not prices.
Does a CNC quotation cover a functioning actuator?
Only if its scope explicitly includes the other components, assembly, electronics, firmware commissioning and acceptance tests. A housing or shaft quotation alone cannot be compared with a complete module.
What quantity makes outsourcing worthwhile?
Calculate the crossover using your fixed qualification costs and variable cost per accepted joint. If the supplier has both higher fixed and higher variable cost, increasing quantity does not create a cost crossover. MOQ is a separate quoted constraint.
Can I buy samples before a production commitment?
Request separate sample, pilot and repeat-order terms for the exact model. Confirm MOQ, tooling ownership, cancellation conditions and revision availability in writing; this report does not establish universal MOQ ranges.
Engineering and delivery
Do all integrated actuators support EtherCAT or CAN-FD?
No general compatibility claim is supported by the reviewed evidence. The cited AK80-9 V3.0 page describes CAN wiring; that alone does not establish CAN-FD, EtherCAT or your host compatibility. Obtain the exact protocol and firmware revision, then bench-test commands and fault recovery.
Can peak torque be used as continuous joint torque?
Do not treat the labels as interchangeable. Ask for the permitted peak duration, repetition, speed, cooling and temperature limits, and test the intended duty cycle. A catalog peak value alone cannot qualify a loaded humanoid joint.
Is local machining always faster?
Compare time to an accepted assembly. Local parts may be quick while a motor, bearing or drive is on a long lead time; a stocked imported module may also be faster. Obtain dated component, integration, transport and retest milestones for both routes.
How should I compare reliability?
Use the same loads, speeds, mounting, thermal conditions and acceptance measurements for both candidates. Request test methods and revision-linked records. This review has no matched endurance dataset supporting a country or brand ranking.
IP and continuity
Does keeping final assembly local protect all my IP?
No. Identify which drawings, firmware and process details each party needs. Limit access and keep disclosure records. Local assembly and catalog hardware can reduce what you share, but do not eliminate exposure.
Is an NDA or NNN agreement enough?
Use contract terms alongside technical access controls and supplier due diligence. WIPO describes confidentiality measures, not a guarantee for a particular jurisdiction. Have qualified counsel review the parties, governing law, permitted use and available remedies before transferring sensitive material.
Can I switch suppliers using the same bolt pattern?
Matching holes is only one condition. Check load ratings, output location, cable routing, encoder reference, communication, controller tuning and thermal behavior. Budget for requalification before treating another actuator as interchangeable.
How many spare actuators should I stock?
Set the buffer from observed failures, replenishment time and the downtime your deployment can tolerate. Before field data exists, document an explicit planning assumption and revisit it after the pilot; no universal spare percentage is established here.
Send an RFQ that both routes can answer
- Engineering: attach the joint envelope, load cases, torque-speed duty cycle, thermal boundary, bus voltage, interfaces and acceptance limits.
- Sourcing: request itemized sample/pilot/repeat quantities in joints, included components, one-time costs, quote expiry, destination and delivery terms.
- Quality: request revision-linked sample reports, inspection coverage, change notification and return/replacement terms.
- Decision owner: compare complete accepted-joint costs, list unresolved evidence and approve the next sample or pilot gate.
Inquiry Email
Include target torque/speed, quantity, and delivery location.
Application Engineer
+8618857971991
Talk directly about drawings, torque-speed targets, and RFQ data gaps.
Sources and review date
All four sources were accessed on . Undated live pages are identified by access date; the CubeMars reference is specifically V3.0 KV100. Recheck revisions and terms at quotation. Tier 1 means a primary source, not independent validation of a vendor claim.
- CubeMars AK80-9 V3.0 KV100 product specification (opens in a new tab)
Tier 1 · manufacturer specification · Accessed 2026-09-21
Documents a motor, planetary gearbox, driver and encoder in one module; lists 9:1 reduction, 9 Nm rated torque, 22 Nm peak torque and CAN wiring.
Limit: One named revision, not a market benchmark. Confirm the connector pinout: the description specifies power/CAN wiring, while the CAN-connector table entry is blank. Operating life and application-specific continuous performance remain unverified.
- Kollmorgen: Frameless Motors (opens in a new tab)
Tier 1 · manufacturer documentation · Accessed 2026-09-21
Defines the frameless kit as stator and rotor, without housing, bearings, shaft, feedback device or brake.
Limit: Establishes the component boundary; does not price a locally assembled joint or rank supplier countries.
- Protolabs: Online CNC Machining Service (opens in a new tab)
Tier 1 · service-provider capability · Accessed 2026-09-21
Advertises eligible machined parts in as fast as one day and distinguishes milling, turning and expanded production capabilities.
Limit: A best-case parts capability, subject to quote and geometry; not a complete actuator, shipment-to-destination or local-industry lead-time guarantee.
- WIPO: How to Protect Trade Secrets? (opens in a new tab)
Tier 1 · intergovernmental guidance · Accessed 2026-09-21
Discusses confidentiality agreements and access controls as measures for protecting confidential information.
Limit: Trade-secret protection has limits, including independent development and reverse engineering. The page does not establish enforceability of a particular cross-border contract.