Product code
- Current Page Value
- MPM-CORELESS-MICRO-PLANETARY-GEAR-MOTORS
- Buyer Use
- Page-level product family identifier used to keep RFQ, drawing, sample, and quote communication aligned.
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Coreless Micro Planetary Gear Motors
Low-inertia coreless micro motors paired with planetary gearheads for compact mechanisms that need smooth low-speed behavior, fast start/stop response, low cogging, and careful current control.
Target Buyer:For designers needing rapid response times and smooth rotation at low speeds, especially where a small brushed motor can still meet the life target more simply than a BLDC system.
OEM pricing, sample terms, freight, and lead time are confirmed by RFQ after drawings, quantity, destination, and validation scope are reviewed.
Commercial Availability
RFQ Terms for Coreless Micro Planetary Gear Motors
Unit pricing, sample terms, freight, and lead time are confirmed by RFQ after drawings, quantity, destination, annual volume, and validation scope are reviewed.
| Field | Current Page Value | Buyer Use |
|---|---|---|
| Product code | MPM-CORELESS-MICRO-PLANETARY-GEAR-MOTORS | Page-level product family identifier used to keep RFQ, drawing, sample, and quote communication aligned. |
| Commercial path | RFQ-based OEM quotation | No public checkout price is shown because winding, ratio, gear material, shaft, validation evidence, freight, and volume change the final unit cost. |
| Offer status | Platform-dependent availability | Standard micro planetary motor platforms are reviewed for custom sampling and production fit before quote confirmation. |
| Condition | New OEM components and assemblies | Samples and production lots are treated as new industrial components tied to the approved drawing revision and buyer file. |
| Valid from | August 5, 2026 | This page describes the current RFQ route; written quotations state their own price validity, incoterm, and lead-time assumptions. |
| Region | Worldwide RFQ support | Destination, compliance needs, packing notes, and shipping route are confirmed during quotation instead of embedded as a fixed retail shipping rate. |
| Quote currency | USD | Export quotations are usually discussed in USD unless a buyer requests another quotation currency. |
Commercial path
- Current Page Value
- RFQ-based OEM quotation
- Buyer Use
- No public checkout price is shown because winding, ratio, gear material, shaft, validation evidence, freight, and volume change the final unit cost.
Offer status
- Current Page Value
- Platform-dependent availability
- Buyer Use
- Standard micro planetary motor platforms are reviewed for custom sampling and production fit before quote confirmation.
Condition
- Current Page Value
- New OEM components and assemblies
- Buyer Use
- Samples and production lots are treated as new industrial components tied to the approved drawing revision and buyer file.
Valid from
- Current Page Value
- August 5, 2026
- Buyer Use
- This page describes the current RFQ route; written quotations state their own price validity, incoterm, and lead-time assumptions.
Region
- Current Page Value
- Worldwide RFQ support
- Buyer Use
- Destination, compliance needs, packing notes, and shipping route are confirmed during quotation instead of embedded as a fixed retail shipping rate.
Quote currency
- Current Page Value
- USD
- Buyer Use
- Export quotations are usually discussed in USD unless a buyer requests another quotation currency.
Capability Highlights
- Very low magnetic cogging
- High acceleration
- Extremely lightweight
Typical Applications
- Medical Handheld Instruments
- Precision Optics
- Miniature Pumps
Engineering Focus
- Heat dissipation
- Inertia matching
- Duty cycle optimization
- Brush and commutator loading under peak current
- Gearbox ratio selection around response time, not torque alone
OEM Buyer Decision Path
Qualify the Product Across Engineering, Procurement, and QA
Product selection usually fails when only one team reviews the motor. Use this path to connect mechanical fit, quote scope, validation evidence, and production handoff before sample approval.
| Buyer Role | Decision Check | Page Evidence | Next Step |
|---|---|---|---|
| Design Engineering | Envelope, output speed, continuous torque, stall condition, backlash/noise limit, shaft datum, and cable route. | Performance window, engineering focus, customization map, CAD/STEP request path, and material review. | Request CAD / STEP |
| Procurement | Prototype quantity, annual volume, destination, sample timing, quote scope, and approved supplier workflow. | RFQ checklist, email template, WhatsApp handoff, and quote caveat before sample pricing. | Send RFQ |
| Quality | Incoming CTQ, drawing revision, torque-speed test condition, noise/backlash method, and lot traceability expectation. | Risk controls, validation scope, buyer file package, and quality evidence review path. | Review Quality |
| OEM Program | NPI stage, frozen BOM fields, custom tooling boundary, packing rules, revision control, and production handoff. | OEM customization options, supplier workflow, export coordination, and related application routing. | OEM Workflow |
Design Engineering
- Decision Check
- Envelope, output speed, continuous torque, stall condition, backlash/noise limit, shaft datum, and cable route.
- Page Evidence
- Performance window, engineering focus, customization map, CAD/STEP request path, and material review.
- Next Step
- Request CAD / STEP
Procurement
- Decision Check
- Prototype quantity, annual volume, destination, sample timing, quote scope, and approved supplier workflow.
- Page Evidence
- RFQ checklist, email template, WhatsApp handoff, and quote caveat before sample pricing.
- Next Step
- Send RFQ
Quality
- Decision Check
- Incoming CTQ, drawing revision, torque-speed test condition, noise/backlash method, and lot traceability expectation.
- Page Evidence
- Risk controls, validation scope, buyer file package, and quality evidence review path.
- Next Step
- Review Quality
OEM Program
- Decision Check
- NPI stage, frozen BOM fields, custom tooling boundary, packing rules, revision control, and production handoff.
- Page Evidence
- OEM customization options, supplier workflow, export coordination, and related application routing.
- Next Step
- OEM Workflow
Key Evaluation Matrix
| Metric | Typical Range | Why It Matters |
|---|---|---|
| Rotor Inertia | Extremely Low | Supports fast start/stop response. |
| Cogging Behavior | Very low cogging torque | Supports smooth low-speed motion in pumps, optics, and handheld instruments. |
| Thermal Margin | Defined by continuous load and duty cycle | Coreless motors respond quickly but still need current limits under sustained load. |
Rotor Inertia
- Typical Range
- Extremely Low
- Why It Matters
- Supports fast start/stop response.
Cogging Behavior
- Typical Range
- Very low cogging torque
- Why It Matters
- Supports smooth low-speed motion in pumps, optics, and handheld instruments.
Thermal Margin
- Typical Range
- Defined by continuous load and duty cycle
- Why It Matters
- Coreless motors respond quickly but still need current limits under sustained load.
Ratio & Performance Window
Reference Performance Table by Frame and Ratio
These RFQ reference windows translate the planning ranges into an engineering shortlist. Final datasheet values are confirmed by winding, ratio, gear material, load, duty cycle, current limit, and test condition before sample approval.
| Frame / OD | Rated Voltage | Ratio Range | No-load RPM | Rated-load RPM | Continuous Output Torque | Stall Torque | Efficiency | Application Fit |
|---|---|---|---|---|---|---|---|---|
| 6mm coreless planetary | 3-6V coreless DC | 5:1-700:1 | Up to 2500 RPM at 6V motor reference | Set by light-load speed and response target | 5-480 g.cm reference window | Approx. 10.8 mN.m reference; current limit required | Best in lower-stage, light-load configurations | Endoscope, micro UAV, miniature servo |
| 10/12mm coreless planetary | 3-12V coreless DC | 5:1-1000:1 | Low-inertia motor platform; RFQ speed required | Matched to response time and heat margin | 100 g.cm-1.5 kg.cm gearbox window | Thermal and brush-current review required | Ratio and duty cycle dependent | Optical focus, pumps, handheld instruments |
| 16mm coreless precision option | 6-24V coreless DC | 4:1-1500:1 | Specified from response-time requirement | Confirmed by loaded acceleration profile | 0.5-5.5 Nm gearbox window; thermal check | Avoid long stall; protect winding and brushes | Best when ratio and inertia are kept moderate | Precision optics, compact pumps, lab devices |
6mm coreless planetary
- Rated Voltage
- 3-6V coreless DC
- Ratio Range
- 5:1-700:1
- No-load RPM
- Up to 2500 RPM at 6V motor reference
- Rated-load RPM
- Set by light-load speed and response target
- Continuous Output Torque
- 5-480 g.cm reference window
- Stall Torque
- Approx. 10.8 mN.m reference; current limit required
- Efficiency
- Best in lower-stage, light-load configurations
- Application Fit
- Endoscope, micro UAV, miniature servo
10/12mm coreless planetary
- Rated Voltage
- 3-12V coreless DC
- Ratio Range
- 5:1-1000:1
- No-load RPM
- Low-inertia motor platform; RFQ speed required
- Rated-load RPM
- Matched to response time and heat margin
- Continuous Output Torque
- 100 g.cm-1.5 kg.cm gearbox window
- Stall Torque
- Thermal and brush-current review required
- Efficiency
- Ratio and duty cycle dependent
- Application Fit
- Optical focus, pumps, handheld instruments
16mm coreless precision option
- Rated Voltage
- 6-24V coreless DC
- Ratio Range
- 4:1-1500:1
- No-load RPM
- Specified from response-time requirement
- Rated-load RPM
- Confirmed by loaded acceleration profile
- Continuous Output Torque
- 0.5-5.5 Nm gearbox window; thermal check
- Stall Torque
- Avoid long stall; protect winding and brushes
- Efficiency
- Best when ratio and inertia are kept moderate
- Application Fit
- Precision optics, compact pumps, lab devices
Sample Acceptance Plan
Turn Product Selection Into Pass/Fail Checks
Before a motor family becomes a sample order, sales engineering converts the RFQ into acceptance checks for engineering, procurement, and quality. These checks keep CAD/STEP release, prototype approval, and repeat production tied to the same specification baseline.
| Workstream | Buyer Question | Evidence to Prepare | Pass Signal |
|---|---|---|---|
| Low-inertia response | Does the coreless motor actually improve start-stop response in the final mechanism? | Target acceleration, load inertia, gearbox ratio, controller profile, and acceptable overshoot. | Start, stop, and reversal response meet the target without unstable control behavior. |
| Current and thermal limit | Will peak current and repeated acceleration avoid brush and winding stress? | Peak current, continuous current, duty cycle, ambient temperature, stall behavior, and controller limit. | Current peaks stay controlled and temperature rise remains acceptable during repeated cycles. |
| Gear material and noise | Can the gearbox preserve smooth motion without adding unacceptable noise or inertia? | Noise target, ratio, material preference, output torque, enclosure condition, and grease requirement. | The chosen gear stack keeps smooth low-speed motion and passes noise review in the device context. |
| Brush life validation | Does the sample life expectation match the load and current profile? | Cycle count, run time per cycle, load curve, current limit, and expected service interval. | Brush wear, speed drift, and current drift remain inside the buyer acceptance plan. |
Low-inertia response
- Buyer Question
- Does the coreless motor actually improve start-stop response in the final mechanism?
- Evidence to Prepare
- Target acceleration, load inertia, gearbox ratio, controller profile, and acceptable overshoot.
- Pass Signal
- Start, stop, and reversal response meet the target without unstable control behavior.
Current and thermal limit
- Buyer Question
- Will peak current and repeated acceleration avoid brush and winding stress?
- Evidence to Prepare
- Peak current, continuous current, duty cycle, ambient temperature, stall behavior, and controller limit.
- Pass Signal
- Current peaks stay controlled and temperature rise remains acceptable during repeated cycles.
Gear material and noise
- Buyer Question
- Can the gearbox preserve smooth motion without adding unacceptable noise or inertia?
- Evidence to Prepare
- Noise target, ratio, material preference, output torque, enclosure condition, and grease requirement.
- Pass Signal
- The chosen gear stack keeps smooth low-speed motion and passes noise review in the device context.
Brush life validation
- Buyer Question
- Does the sample life expectation match the load and current profile?
- Evidence to Prepare
- Cycle count, run time per cycle, load curve, current limit, and expected service interval.
- Pass Signal
- Brush wear, speed drift, and current drift remain inside the buyer acceptance plan.
Selection-Ready Product Data
Build the Ratio Table Before Sample Approval
Public diameter pages are only the starting point. For RFQ review, sales engineering confirms rated voltage, no-load RPM, rated-load RPM, continuous output torque, stall torque, current, efficiency, and gear ratio against your mechanism before releasing drawings or sample pricing.
| Performance Field | Buyer Input | How It Shapes the Quote |
|---|---|---|
| Rated voltage and current limit | 3V, 6V, 12V, 24V, or buyer-defined driver limit | Selects the winding, thermal margin, stall-current boundary, and battery or adapter fit. |
| No-load speed and loaded output speed | Motor RPM, target output RPM, and acceptable speed tolerance | Narrows the gear ratio and keeps the prototype inside the required actuation time. |
| Continuous output torque and stall torque | Working torque, peak load, jam condition, and stall duration | Checks gear material, shaft support, carrier strength, and safety margin before sampling. |
| Gear ratio and efficiency target | Known ratio, output RPM target, or torque-speed curve from the mechanism | Builds the ratio table used to compare speed, torque, current, efficiency, and heat rise. |
| Duty cycle and life target | On/off sequence, cycles per day, lifetime cycles, ambient temperature | Defines grease, gear stack, winding temperature, brush life, and sample validation scope. |
| Noise and backlash limit | dB limit, measurement distance, arcmin or degree target, load fixture | Separates POM, hybrid, metal, and low-backlash options before the CAD exchange. |
Rated voltage and current limit
- Buyer Input
- 3V, 6V, 12V, 24V, or buyer-defined driver limit
- How It Shapes the Quote
- Selects the winding, thermal margin, stall-current boundary, and battery or adapter fit.
No-load speed and loaded output speed
- Buyer Input
- Motor RPM, target output RPM, and acceptable speed tolerance
- How It Shapes the Quote
- Narrows the gear ratio and keeps the prototype inside the required actuation time.
Continuous output torque and stall torque
- Buyer Input
- Working torque, peak load, jam condition, and stall duration
- How It Shapes the Quote
- Checks gear material, shaft support, carrier strength, and safety margin before sampling.
Gear ratio and efficiency target
- Buyer Input
- Known ratio, output RPM target, or torque-speed curve from the mechanism
- How It Shapes the Quote
- Builds the ratio table used to compare speed, torque, current, efficiency, and heat rise.
Duty cycle and life target
- Buyer Input
- On/off sequence, cycles per day, lifetime cycles, ambient temperature
- How It Shapes the Quote
- Defines grease, gear stack, winding temperature, brush life, and sample validation scope.
Noise and backlash limit
- Buyer Input
- dB limit, measurement distance, arcmin or degree target, load fixture
- How It Shapes the Quote
- Separates POM, hybrid, metal, and low-backlash options before the CAD exchange.
Customization Options
Match the Motor to the Mechanical Boundary
The useful custom scope is normally around the shaft, gearbox stack, feedback, cable exit, connector, and buyer file package. These options should be fixed before tooling, CAD exchange, or pilot builds.
| Custom Area | Common Options | RFQ Signal |
|---|---|---|
| Output shaft and mounting | D-cut, flat, threaded, cross-drilled, keyway, custom length, flange, bearing support. | Attach shaft datum, mating part drawing, radial/axial load direction, and installation sequence. |
| Gear material and backlash | POM, MIM, machined metal, hybrid stages, grease selection, low-backlash build review. | State torque peaks, reversing frequency, noise target, temperature, and life requirement. |
| Feedback and control | Encoder, Hall signal, EMI suppression, pinout, driver match, current-limit review. | Share CPR, signal voltage, controller type, cable route, connector drawing, and EOL test needs. |
| Cable, connector, and assembly | Lead wire length, connector model, cable exit, strain relief, bracket, harness, module assembly. | Include enclosure envelope, bend radius, pull-force concern, label rules, and packing notes. |
| Compliance and buyer file | RoHS/REACH file, material note, drawing revision, sample test report, lot traceability. | Confirm destination, regulated-market expectations, incoming inspection plan, and annual volume. |
Output shaft and mounting
- Common Options
- D-cut, flat, threaded, cross-drilled, keyway, custom length, flange, bearing support.
- RFQ Signal
- Attach shaft datum, mating part drawing, radial/axial load direction, and installation sequence.
Gear material and backlash
- Common Options
- POM, MIM, machined metal, hybrid stages, grease selection, low-backlash build review.
- RFQ Signal
- State torque peaks, reversing frequency, noise target, temperature, and life requirement.
Feedback and control
- Common Options
- Encoder, Hall signal, EMI suppression, pinout, driver match, current-limit review.
- RFQ Signal
- Share CPR, signal voltage, controller type, cable route, connector drawing, and EOL test needs.
Cable, connector, and assembly
- Common Options
- Lead wire length, connector model, cable exit, strain relief, bracket, harness, module assembly.
- RFQ Signal
- Include enclosure envelope, bend radius, pull-force concern, label rules, and packing notes.
Compliance and buyer file
- Common Options
- RoHS/REACH file, material note, drawing revision, sample test report, lot traceability.
- RFQ Signal
- Confirm destination, regulated-market expectations, incoming inspection plan, and annual volume.
Evidence Pack Before Sampling
Evidence Pack to Request Before Sampling
These files are normally reviewed by request rather than downloaded instantly. Confirm the scope early so drawings, sample data, quality records, and production notes match the same motor revision.
| Evidence Item | What to Request | Why It Matters | Route |
|---|---|---|---|
| CAD / STEP baseline | Outer diameter, length, shaft geometry, flange datum, connector clearance, and mating-part constraints. | Prevents a mechanically suitable motor from failing because of envelope, shaft, or mounting mismatch. | CAD request |
| Torque-speed-current window | Rated voltage, no-load speed, rated-load speed, continuous torque, stall torque, current limit, and duty cycle. | Separates reference catalog windows from the sample value set that purchasing and engineering can approve. | RFQ template |
| Inspection and test evidence | Dimensional CTQ, gear ratio check, no-load current, load test, noise/backlash method, and final inspection record. | Lets the buyer define what must be proven before incoming inspection, pilot build, or supplier approval. | Quality review |
| Gear material and backlash route | POM, hybrid, or metal stage choice, grease condition, reversing motion, temperature, shock load, and noise target. | Aligns durability, acoustic behavior, backlash, cost, and life expectation before the sample BOM is frozen. | Material guide |
| OEM handoff package | Drawing revision, cable/connector rules, label and packing notes, destination, compliance file needs, and annual volume. | Turns a selected sample into a production-ready supplier package with fewer revision loops. | OEM workflow |
CAD / STEP baseline
- What to Request
- Outer diameter, length, shaft geometry, flange datum, connector clearance, and mating-part constraints.
- Why It Matters
- Prevents a mechanically suitable motor from failing because of envelope, shaft, or mounting mismatch.
- Route
- CAD request
Torque-speed-current window
- What to Request
- Rated voltage, no-load speed, rated-load speed, continuous torque, stall torque, current limit, and duty cycle.
- Why It Matters
- Separates reference catalog windows from the sample value set that purchasing and engineering can approve.
- Route
- RFQ template
Inspection and test evidence
- What to Request
- Dimensional CTQ, gear ratio check, no-load current, load test, noise/backlash method, and final inspection record.
- Why It Matters
- Lets the buyer define what must be proven before incoming inspection, pilot build, or supplier approval.
- Route
- Quality review
Gear material and backlash route
- What to Request
- POM, hybrid, or metal stage choice, grease condition, reversing motion, temperature, shock load, and noise target.
- Why It Matters
- Aligns durability, acoustic behavior, backlash, cost, and life expectation before the sample BOM is frozen.
- Route
- Material guide
OEM handoff package
- What to Request
- Drawing revision, cable/connector rules, label and packing notes, destination, compliance file needs, and annual volume.
- Why It Matters
- Turns a selected sample into a production-ready supplier package with fewer revision loops.
- Route
- OEM workflow
Gear Material Review
Confirm POM, Hybrid, or Metal Stages Before Prototype Approval
Use the material guide to align noise, torque density, stall load, wear, grease, and backlash expectations before the sample BOM is frozen.
CAD / STEP Request
Request Outline Drawings Before You Freeze the Mechanical Design
Share the mating envelope and target duty data so sales engineering can confirm whether an existing outline drawing, STEP/IGES file, or custom shaft and flange proposal is suitable for your project.
1
Installation envelope, mounting pattern, shaft interface, and cable exit.
2
Voltage, loaded speed, torque, gear ratio, duty cycle, noise, and backlash limits.
3
Preferred CAD format, drawing revision, prototype quantity, destination, and compliance notes.
Fields engineering checks before sharing a model
- Product fit
- Diameter, gearbox length, motor family, shaft style, flange pattern, and cable or connector exit.
- Performance target
- Voltage, loaded speed, continuous torque, peak or stall torque, ratio, duty cycle, life, noise, and backlash.
- Mechanical interface
- Mating drawing revision, installation clearance, radial or axial load, tolerance priority, and assembly sequence.
- Release package
- 2D outline, STEP/IGES envelope, custom shaft/flange review, datasheet values, and quality evidence scope.
Useful before CAD freeze
CAD files are shared by project fit and revision status. For custom shafts, flanges, cable routing, or gearbox interfaces, attach the mating drawing so the first CAD exchange uses the correct mechanical boundary.
RFQ Checklist
- Target response time
- Maximum ambient temperature
- Continuous vs peak torque
- Voltage range, current limit, and allowed stall event duration
- Duty cycle, life target, and acceptable brush wear evidence
- Required ratio, output speed, and feedback option
Risk Controls
- Overheating under load: Ensure continuous torque does not exceed thermal limits without an iron core.
- Brush wear from excessive current: We review peak current, duty cycle, and stall events before choosing winding and gear ratio.
- Gearbox inertia masks the coreless benefit: Frame size, ratio, and gear material are selected around response time rather than torque alone.
- Peak acceleration demand overheats the winding: Acceleration profile, controller current limit, duty cycle, and thermal path are checked before selecting winding and ratio.
Product Gallery
Buyer FAQ
Do coreless motors have longer lifespans?
Yes, when operated within rated limits, the lack of iron core reduces bearing wear and brush arcing.
When should we choose coreless instead of BLDC?
Choose coreless for compact, smooth, fast-response duty. Choose BLDC when continuous life, high duty cycle, or electronic commutation is the main requirement.
Can encoder feedback be added?
Yes. Magnetic or Hall feedback can be reviewed when space, voltage, pulse count, and connector limits are included in the RFQ.
When is coreless not the best choice?
Avoid coreless when the product needs very long continuous life, frequent stalls, or high thermal margin; BLDC may be the better architecture.
Related Resources
Product Qualification Review
Ready for a Product-Specific OEM Review?
Send the target size, voltage, torque, speed, ratio, quantity, drawing status, and validation concerns. Sales engineering can then confirm whether this product family is the right starting point or whether another frame, gear material, or OEM assembly route is safer.
WhatsApp: WhatsApp Engineering Support. Email: [email protected].
Inquiry Email
Include OD/length, voltage, torque, loaded speed, ratio, drawings, quantity, and destination.
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WhatsApp Engineering Support
Fast channel for clarifying specs, drawings, and sample timing.