Custom frameless torque motors, hollow shaft BLDC servo motors, micro servo motors, and encoder-ready motor kits for robot axes with tight size and thermal constraints.
| Metric | Typical Range | Why It Matters |
|---|---|---|
| Motor geometry | Frameless, housed, hollow shaft, pancake, micro | Geometry determines assembly method, bearing support, and available copper volume. |
| Torque-speed target | Defined by axis duty cycle | A motor selected only by peak torque often fails continuous heat-rise requirements. |
| Encoder interface | Magnetic, optical, inductive, resolver-ready | Feedback accuracy and mechanical datum control are central to servo stability. |
| Situation | Recommended Path | Evidence to Confirm |
|---|---|---|
| The joint has a fixed diameter, height, or hollow bore | Use a frameless, hollow-shaft, pancake, or housed custom motor based on the bearing and assembly plan | OD, stack length, bore, shaft, bearing datum, fastener access, cable exit, and cooling path drawings |
| Low-speed smoothness matters more than headline peak torque | Prioritize winding, slot/pole choice, cogging control, rotor balance, and encoder datum accuracy | Cogging target, current ripple target, encoder type, balance grade, noise limit, and low-speed test method |
| The drive or battery platform is already fixed | Wind the motor around the available voltage, current, back-EMF, inductance, and drive-loop constraints | Phase resistance, inductance, KV/back-EMF, continuous current, peak current duration, and controller rating |
Quoted after drawings, torque-speed targets, electronics scope, validation requirements, and annual volume assumptions are reviewed.
Quote validity, lead time, and sample schedule are confirmed on each proposal after material availability and capacity checks.
Start with an RFQ package; commercial terms follow engineering review, prototype scope, pilot-lot gates, and production readiness evidence.
| Checkpoint | Method | Pass Evidence |
|---|---|---|
| Electromagnetic parameter check | Measure resistance, inductance, KV/back-EMF, torque constant, no-load current, and insulation condition | Motor parameter sheet tied to serial number, winding revision, and controller limits |
| Thermal duty-cycle check | Test the real load cycle with housing temperature, winding temperature, current, speed, and ambient logged | Temperature-rise curve and derating recommendation for the buyer envelope |
| Mechanical repeatability check | Inspect bore, shaft, flange, bearing datum, cable exit, rotor balance, and encoder mounting interface | Dimensional inspection record and assembly notes for pilot-build release |
Supplier Evidence
For product selection pages, the first engineering review should turn the RFQ into testable assumptions, not just a price request.
Motor, drive, actuator, firmware, harness, fixture, and test responsibility are separated before quotation.
Open items such as torque-speed data, duty cycle, envelope, protocol, encoder, and target launch country are flagged early.
Prototype checks are tied to load profile, thermal rise, backlash, noise, current limit, and end-of-line pass criteria.
Tooling, fixture, pilot lot, annual forecast, packaging, documentation, and delivery assumptions are made explicit.
| Evidence Group | What to Attach | Buyer Value |
|---|---|---|
| Motion and thermal | Torque-speed target, current limit, duty cycle, temperature path, and derating assumption. | Separates continuous-duty capability from peak torque claims before sample approval. |
| Interface control | STEP or drawing revision, flange, bore, cable exit, connector, encoder, and protocol map. | Keeps motor, drive, harness, and firmware assumptions aligned before tooling. |
| Validation record | EVT, DVT, PVT gate criteria, EOL checklist, burn-in profile, and serial or lot traceability. | Gives engineering and procurement a common pass/fail basis for pilot lots. |
| Commercial path | Prototype quantity, pilot build target, annual forecast, delivery country, and packing notes. | Improves quote precision and avoids late shipping or documentation surprises. |
Use these templates before sending a Custom Servo Motors inquiry so torque-speed data, drawings, thermal assumptions, and sample acceptance evidence arrive in one package.
CSV
A field-by-field checklist for torque-speed-duty targets, drawings, protocol, sample quantity, acceptance tests, and open decisions.
Use before the first supplier email so engineering, sourcing, and procurement are aligned on required inputs.
CSV
A starting validation matrix for torque, current, heat rise, backlash, encoder zero, communication, burn-in, and outgoing inspection.
Use when samples are being scoped and the buyer needs pass/fail evidence before pilot approval.
CSV
A compact worksheet for comparing ambient, housing, winding, duty cycle, current limit, and sealed-joint thermal margin.
Use when peak torque looks acceptable but continuous-duty heat rise is still the main project risk.
Yes. Send the available diameter, axial height, shaft or hollow bore, mounting holes, torque-speed curve, and thermal limits.
Yes. We can review phase resistance, inductance, back EMF, encoder output, current limit, and control loop requirements together.
Inquiry Email
Include drawings, torque/speed, protocol, and prototype quantity.
