CUSTOM MOTOR DEVELOPMENT / OEM & R&D
Up to 800 V DC / 50–200 kW inquiry targets
Review a compact propulsion package around continuous shaft output, the actual DC voltage window and the available cooling loop. Define motor, inverter and integration responsibilities before turning a target power into a prototype specification.
THE PROGRAM STARTS HERE
01
Document maximum DC voltage, inverter switching conditions, cable length, winding-to-frame requirements, grounding and the environment. Agree insulation test methods and limits for the specific assembly rather than copying a generic voltage label.
02
Compare jacket, stator-contact or direct-fluid concepts against the heat path, coolant compatibility, pressure drop, sealing and maintenance requirements. Oil and water-based loops have different electrical and material interfaces.
03
Include thrust, gyroscopic and maneuver loads, overspeed conditions, shaft coupling and rotor containment responsibilities. An electromagnetic design is one part of the mechanical release.
INPUTS / INTERFACES / OWNERSHIP
These are the decisions to scope before a quotation. Feasibility, engineering deliverables, sample cost, tooling and recurring production terms follow the agreed requirements.
| Interface | Customer inputs | Acceptance boundary |
|---|---|---|
| Bus & inverter | Minimum / nominal / maximum DC voltage; drive and switching data | Back-EMF, field-weakening assumptions, current and speed limits |
| Insulation | Operating environment, grounding, cable and insulation requirements | Agreed resistance / withstand methods and any partial-discharge investigation |
| Thermal | Output cycle, coolant type, inlet temperature, flow and pressure | Stabilized continuous output, peak duration and measured temperatures |
| Rotor mechanics | Maximum operating / transient speed, thrust and radial loads | Retention, balancing, clearance and agreed overspeed evidence |
| Controls | Inverter, resolver / encoder, communications and fault strategy | Signal compatibility, commissioning and fault-response responsibilities |
| Program release | Application, market, validation owner and evidence package | Prototype acceptance distinct from vehicle, marine or flight approval |
WORKED EXAMPLE / ASSUMED INPUTS
For an illustrative 100 kW shaft operating point, torque is about 318 Nm at 3,000 rpm, or about 159 Nm at 6,000 rpm. Both points have the same mechanical power and very different design implications.
T (Nm) = 9550 × P_shaft (kW) / n (rpm)
This is a rounded unit conversion, not an available torque–speed curve. Continuous output also needs the heat rejection, winding limits and test conditions. The two points are not asserted to lie on one motor envelope.
APPLICATION-SPECIFIC DUTY
Review the full traction cycle, gearing, regeneration, inverter mapping and hot restart. Compare packaged drive mass and cooling auxiliaries alongside motor-only numbers.
Sustained duty, shaft loads, coolant fouling, corrosion and maintenance access can dominate. Identify the integrator and any vessel-specific acceptance requirements.
Provide altitude and ambient envelopes, thrust loads, mission duty and cooling-fault scenarios. No airworthiness, redundancy or flight-use approval is implied by an engineering discussion.
AGREE ACCEPTANCE BEFORE SAMPLES
START WITH A NON-CONFIDENTIAL BRIEF
Send the requirements and quantities first. Request an NDA before sharing detailed proprietary CAD. The review defines feasibility, deliverables and responsibilities before pricing or timing is confirmed.
Use the inquiry form, or contact us directly with your duty cycle, package, cooling and quantity requirements.
ENGINEERING & PROCUREMENT
No released model is represented here. Up to 800 V and 50–200 kW describe the inquiry envelope. A specific operating point, continuous output and insulation design require feasibility review and agreed verification.
No direct replacement or parameter equivalence is claimed. Share the actual mounting, electrical, cooling and duty requirements for an independent design review. YokelessMotor is not affiliated with YASA or Mercedes-Benz.
Choose through a system thermal and materials review. Heat path, fluid compatibility, sealing, pumping, contamination and service requirements matter. No cooling method guarantees a particular continuous rating by itself.
No such certification is stated. Define the applicable program requirements, qualification evidence and responsible approval parties before commissioning hardware for a regulated application.
No. Peak duration, starting temperature, recovery time, coolant conditions and torque–speed duty are required. Continuous output must be tied to a defined thermal test rather than a fixed fraction of peak.
Yes. Specify the stator, rotor or housing deliverable and the interfaces you retain. Component inspection and the final propulsion-system release are separate acceptance activities.
