Custom Electric Motors Engineered for Your Application
Scalable, stackable custom electric motor technology, built around your application for long-lasting, efficient, and reliable operation.
Up to
50%
weight reduction!
Up to
96%
efficiency!
Up to
20 years
lifetime!
Up to
IP67
protection!
Stop comparing datasheets,
-define your own specifications!
We design ultra light, compact, reliable electric motors for your application.
Why Axial Flux
An axial flux motor moves magnetic flux along the rotation axis, through a flat, disc-shaped air gap, instead of around the outside of a cylinder like a conventional radial flux motor. Rotor and stator sit face to face as thin discs rather than as a long shaft wrapped in windings. See the full axial flux vs radial flux comparison for the complete picture.
That geometry changes the torque equation: an axial flux disc produces torque that scales with the cube of its diameter, not the square, so material at the outer edge does more work per gram. It's also what makes a coreless, ironless stator possible, since there's no cylinder wall to wind, only a flat disc to print or pot. Together, these choices are why Turncircles motors reach up to 50% less weight at the same torque and power density.
Diameter, stack count, and stator type are parameters you set for your own application. See how a custom electric motor gets designed around your exact torque, speed, and voltage requirements.
Scalable in diameter
The motor's parametric design allows scaling up to provide more torque at higher efficiency, and lets the motor adapt quickly to new application requirements.
Stackable as the power need
The stackable feature which allows a number of motors to be stacked together in a series. With each stack, you will quickly add up power and torque to the electric motor.
Input electric motor power need
| Power output (POut) | 350W | |
| Torque (T) | 1.55Nm | |
| Scale | Outer diameter 125mm |
|
| Stack | Number of Stacks 1 |
|
| Model | AF24PM-S1-125 | |
Our Electric Motor Technology
Electric motors improve by getting smaller, lighter, and more powerful. Turncircles focuses on exactly those three gains when advancing its motor technology.
Turncircles designs electric motors with a higher Power-to-Weight ratio than competing designs. Companies in the Aviation and Space industry can integrate our technology into their electric motor propelled products to reduce weight and increase power. These features can translate into improving flight times for UAV/Pseudo-Satellite manufacturers operating on earth or for reducing costs to launch motor-operated electronic devices into space by saving weight.
Electric Motor Technical Specifications
Turncircles motor design differentiates itself from other motor manufacturers by not using standard windings and any iron for the stators but rather using alternative concepts for providing the magnetic flux for producing motion.
Our electric motors deliver a nominal speed of up to 6.000 RPM and a nominal torque of up to 100 Nm (multi stack). They operate across a voltage range of up to 370 VDC, so they adapt to different power sources.
They withstand extreme temperatures, from -40°C to +60°C, and reach IP classifications up to IP67 against dust and moisture. Their efficiency reaches up to 96%, and lifespan reaches up to 20 years.
These specifications apply across the full range of custom motor configurations.
Key specifications:
- Nominal speed up to 6000RPM
- Nominal Torque up to 24Nm per stack
- Voltage up to 370VDC
- Temperature from -40C to +60C
- IP Classification up to IP67
- Up to 96% efficiency
- Up to 20 years lifetime
Turncircles motor design is scalable with short development lead times because it is based on a parametric motor model that is also stackable. The motor design is also simplistic, making it easy to assemble and repair. It is reliable with less potential failure modes than conventional electric motors.
The ultra light permanent magnet brushless DC electric motor technology is an axial flux motor available in in- and out-runner configurations and provides higher torque at lesser weight. It can be tailored to meet the exact specification between 60mm to 406mm in diameter, and the electric motor can be stacked to meet the power requirement up to 56kW.
Frequently Asked Questions
What is a BLDC electric motor?
A brushless DC (BLDC) motor uses permanent magnets on the rotor and electronically commutated windings on the stator, with no brushes to wear out. Turncircles builds axial flux BLDC motors, where flux crosses a flat, disc-shaped air gap rather than a cylindrical one. See the axial flux vs radial flux comparison for how that changes torque and weight.
What size motors can I configure?
The configurator covers outer diameters from 60mm to 406mm and output up to 56kW, reached by stacking multiple rotor-stator pairs rather than building one larger motor. Torque and power density depend on which basis you're comparing, so the configurator shows continuous and peak figures for every size.
How long does a custom design take?
Every motor comes from the same parametric model, so the configurator produces a design and a quote directly from your target torque, speed, and voltage, with no separate engineering study needed to get started. Once you're happy with your design, assembly takes as little as 20 working days. Designs built with rare-earth magnets may need a little longer, up to about 50 days, to allow for international customs clearance on those materials. Read more about what "custom" means at Turncircles.
Is the configurator free to use?
Yes. Creating an account and configuring a motor costs nothing; you only pay when you order. Build your motor to see pricing for your own specification.
Who builds Turncircles motors?
Turncircles is a small team of engineers with more than 60 years of combined experience in electric machines, mechanical design, and manufacturing. Meet the team below, or get in touch directly with a question about your application.
About the Team
The team is made up of former classmates and colleagues from around the globe, all passionate about engineering ideas into reality. Collectively, there are more than 60 years of engineering experience behind Turncircles.
Dr. Erik Nordlund holds a PhD in electrical machines and drives and leads electrical design. Marius Blumenberg leads mechanical design. John Naim handles business strategy, and Kaan Ozgen leads operations.
Hi, I'm Kaan, your point of entry into customizing the most efficient electric motor for your application. Get in touch and tell me what you're building.