DECISION / 01
Separate three load stories
A vehicle acceleration event, a marine cruise point and a machine’s repeated low-speed pull create different thermal histories. Send a time series or representative cycle for your own project.
APPLICATION ENGINEERING / OEM & R&D
Axial flux motors for EV, marine & off-highway projects.
Fit the motor to the load cycle and the installation. Scope a compact drive around torque, speed, cooling, shaft loads and the environment it will actually operate in.
Component, assembly or custom motor scope · Reviewed 20 October 2026
START WITH THE CONSTRAINTS
A thin motor still needs room for a working drive.
An axial package can help when available length is limited, but cable bends, coolant fittings, bearings, couplings and service access also occupy space. Specify the complete installation envelope and load cycle before selecting a motor architecture or requesting a price.
DECISION / 02
Match the electrical system
Provide minimum and maximum bus voltage, inverter current definitions, speed range and regenerative operation. Agree winding, feedback and temperature-sensor compatibility together.
DECISION / 03
Define the environment
Distinguish freshwater, salt spray, immersion, dust and washdown. Specify sealing, materials, cooling-loop separation and validation conditions rather than assuming a generic IP label covers every exposure.
REQUIREMENT → EVIDENCE
Turn an application into a reviewable scope.
Use this proposed review matrix to identify what is known, what needs a test and who can approve the result. Acceptance limits are agreed for your project.
| Application | Requirement to resolve | Evidence to request |
|---|---|---|
| EV / performance vehicle | Acceleration, sustained grade or track duty; gearing and regenerative envelope | Torque–speed–time test points with bus, current and temperature conditions |
| Marine propulsion | Propeller torque curve, sustained cruise and manoeuvring / reverse duty | Continuous-duty thermal record and thrust / coupling load review |
| Off-highway / mobile machinery | Repeated launch, low-speed high torque, stalls and idle recovery | Representative cycle, protective limits and restart conditions |
| Package and shaft | Axial length, diameter, mounts, coupling and external bearing arrangement | Controlled interface drawing, load assumptions and service clearances |
| Cooling loop | Fluid, inlet temperature, flow, available pressure and heat-rejection capacity | Thermal acceptance at defined boundary; leak and pressure checks if commissioned |
| Environment | Actual water, salt, dust, vibration and corrosion exposure | Agreed test method, acceptance criteria and post-test inspection |
Start a marine brief from the shaft point
For an assumed 20 kW shaft-output target at 2,000 rpm, T = 9,550 × 20 / 2,000 = 95.5 Nm. This is one operating point. A propeller curve, reverse manoeuvre and continuous cooling boundary are still needed.
The example is an input conversion, not a 20 kW product offer. It does not calculate electrical input, hull performance, endurance or thermal capability.
SUPPLY AND INTEGRATION
Agree who owns each interface.
| Interface | Motor work package | System integration work package |
|---|---|---|
| Electrical / controls | Agreed winding data, feedback and temperature-sensor interfaces | Inverter selection, tuning, torque commands, interlocks and regeneration limits |
| Mechanical / thrust | Mounting and shaft interfaces; only the loads explicitly accepted | Gearbox, propeller or wheel loads, coupling and external bearing design |
| Thermal / environmental | Defined cooling connections, materials and commissioned verification | Heat exchanger, pumps, filtration, hull / chassis installation and exposure specification |
| Vehicle or vessel release | Quoted sample and inspection deliverables | Installation validation and applicable vehicle / vessel approval decisions |
REVIEW / 01
Load-cycle review
Selected operating points, peak duration, repetition and hot-start conditions.
REVIEW / 02
Interface freeze
Revisioned electrical, shaft, mount, cooling and environmental requirements.
REVIEW / 03
Prototype acceptance
Agreed bench evidence, exceptions and remaining integration tests before system release.
No vehicle approval, marine class approval, ingress rating or corrosion qualification is stated. Controllers and system commissioning are included only when explicitly named in the agreed work package.
Review air-gap and inspection planningFIRST CONVERSATION / NON-CONFIDENTIAL
Prepare your engineering brief.
- Application and supplied scope: complete motor, frameless assembly or components.
- DC voltage window, torque–speed duty and peak duration / repetition.
- Inverter, feedback, regeneration and protection requirements.
- Envelope, shaft / coupling loads and cooling-loop boundary.
- Exposure conditions, inspection needs, sample / annual quantity and schedule.
From requirements to a scoped review
Your inquiry opens the requirements discussion. We first identify missing inputs and the requested deliverables; feasibility, price, schedule and verification work need a project-specific agreement.
The contact form carries this application and source page. Request an NDA before sharing proprietary drawings. It records requirements and does not upload CAD or execute an agreement.
Discuss your drive requirements Download the application worksheetChoose the next engineering work package.
48 V / 96 V development program
Review current, battery window and winding requirements.
Review 48 v / 96 v development programHigh-voltage propulsion program
Review bus, insulation, cooling and controls integration.
Review high-voltage propulsion programPrecision housing scope
Define bearing seats, sealing interfaces and inspection datums.
Review precision housing scopeApplication procurement questions.
Can I buy a listed 20 kW or 100 kW motor immediately?
These pages organize custom development inquiries rather than released stock models. Send duty, bus voltage, envelope, cooling and quantity to establish feasibility, scope and a project-specific quotation.
Does the quote include a controller?
Only if controller supply, compatibility review and commissioning are explicitly included. Name the proposed inverter, current limits, feedback and control interfaces in the brief.
Can a motor drive a propeller directly?
Evaluate the propeller torque–speed curve, thrust and moment loads, shaft support and intended speed range. A suitable electromagnetic operating point does not by itself establish a complete direct-drive installation.
Does liquid cooling make the motor suitable for seawater?
No such suitability follows from the cooling method. Specify the fluid circuit, materials, salt exposure, sealing and required evidence. Direct seawater circulation must be reviewed explicitly rather than assumed.
Can a 48 V and a high-voltage program use the same winding?
Do not assume so. Bus range, speed, current, insulation and inverter limits must be evaluated for the proposed winding and duty. The two program pages provide separate input checklists.
How do we get a meaningful price?
Provide a non-confidential operating brief, scope, quantities and acceptance needs first. Separate prototype engineering, tooling, sample inspection and recurring units in the quotation request; any schedule and price remain subject to review.
Source context and review boundary
Reviewed by the YokelessMotor editorial team on 20 October 2026. Tables, examples and responsibility splits are our proposed planning tools. External sources provide context, not evidence of our tested hardware or certification.
- EMRAX installation manual v1.7
Sections 3.2–3.6 illustrate model-specific shaft, winding, output and cooling interfaces. Its limits are manufacturer-specific, not claims for YokelessMotor.
- YASA axial flux technology
Manufacturer context for compact axial packaging and its direct-oil-cooling approach. YASA performance claims and cooling design are not transferred to our projects.