Deeply technical guide to selecting the perfect axial flux motor. We break down power density, thermal management, and application-specific needs for Marine, EV, and Aviation.
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Deeply technical guide to selecting the perfect axial flux motor. We break down power density, thermal management, and application-specific needs for Marine, EV, and Aviation.
Choosing an electric motor used to be simple: you looked at the horsepower and the RPM, and you bought a heavy iron cylinder. But in the era of high-performance electrification, "off-the-shelf" often means "under-optimized."
Whether you are designing a VTOL aircraft, a high-speed electric boat, or a hypercar, the transition to cutting-edge axial flux technology offers advantages that traditional radial motors simply cannot match. However, not all axial flux motors are created equal.
This guide will walk you through the critical technical criteria you need to evaluate to pick the right motor for your specific application.
The first question isn't "how much power?" but "where does it fit?"
Axial flux motors are famous for their thin, disc-like profile (often called pancake motors). If your design is axially constrained—such as fitting a motor between an engine and transmission, or inside a wheel hub—this geometry is essential.
This is the most common trap for buyers. Many manufacturers market their motors based on Peak Power (what the motor can do for 10 seconds before overheating). However, your application likely needs sustained performance.
When comparing datasheets—like in our technical analysis of Beyond Motors vs. Emrax—pay close attention to the Continuous torque and power ratings. A superior cooling system (like Beyond Motors' water-cooling channels) will allow a motor to run closer to its peak numbers for longer durations.
A motor that works in a clean, dry lab might fail in the middle of the ocean. Your buying decision must account for environmental resilience.
Saltwater, humidity, and constant high-load drag define this sector. You need high torque at lower RPMs to drive propellers efficiently.
Here, the focus is on the drive cycle—efficiency across a wide range of speeds (stop-and-go vs. highway).
What if your power requirements change halfway through the design process? Or what if you have a "Sport" version and a "Standard" version of your vehicle?
Standard radial motors usually require a complete redesign to get more power. However, a key feature to look for in axial flux motors is stackability.
Choosing a stackable architecture effectively "future-proofs" your drivetrain, allowing you to scale power output without re-engineering your chassis or mounting brackets.
High power density generates heat in a small space. How the motor sheds that heat determines its lifespan.
Ensure your vehicle or vessel has the plumbing infrastructure to support a liquid-cooled motor. The trade-off in complexity is worth the massive gain in continuous power density.
Before contacting a manufacturer, have these five data points ready:
Still not sure which model fits? Check out our Configurator to play with the specs, or read our detailed technical comparisons to see how our motors stack up against the competition.
