More power
MOTORS
Smaller & Lighter
Coolshaft™
Rare Earth Magnets
Reinvent the Motor
Cheaper
Reinvent the Motor
Motor Power Density
cost reduction
The Unified Excitation Synchronous Motor (UESM) is Cooled Motors’ proprietary magnetless motor technology, developed to push the limits of electric drive performance. It introduces a new approach to electric machine innovation, combining multilayer system-level innovations across electromagnetics, excitation, and control.
UESM eliminates rare-earth permanent magnets while avoiding the need for additional external power electronics. It is designed to operate with standard off-the-shelf three-phase inverters (two-level, three-leg inverter).
By rethinking how excitation is generated and controlled within the motor, UESM is designed to deliver superior torque, power density and efficiency. The rotor topology is also engineered for superior mechanical and thermal capabilities, supporting higher peripheral speeds and enabling more compact, high-performance electric drive systems.
A New Class of Magnetless Motor built on our breakthrough Unified Excitation Synchronous Motor (UESM) topology.
We’ve engineered the first drop-in, magnet-free motor that removes every historical barrier to adoption, allowing OEMs to replace their PM motors with magnetless without the need for any changes to platform, or power electronics and without performance or efficiency compromises.
UESM combines advanced integrated excitation, next-gen rotor winding, breakthrough control and advanced cooling to deliver PM-class (and beyond) performance with zero rare-earths and no platform changes.
Magnet-free, without compromise.
Neodymium rare-earth magnets deliver unparalleled power density, efficiency, and controllability. Replacing a rare-earth magnet machine with magnet-free counterpart while maintain the same wide range performance, weight, size, and efficiency is a true challenge.
The Wound-Field Synchronous Motor (WFSM, also known as the Externally Excited Synchronous Motor (EESM), has been widely considered the only the only topology capable of delivering the continuous-power range, high torque, and high efficiency required for passenger EVs and heavy-duty applications. However, the EESMs being developed for release in the next few years have complex/large/expensive oil cooling systems, can’t match the performance of PM motors and require specialist power electronics. Our breakthrough UESM topology eliminates these issues, heralding the way for the replacement of rare-earth permanent magnet motors.
The Wound-Field Synchronous Motor (WFSM, also known as the Externally Excited Synchronous Motor (EESM), has been widely considered the only the only topology capable of delivering the continuous-power range, high torque, and high efficiency required for passenger EVs and heavy-duty applications. However, EESM being developed for release in the next few years have complex/large/expensive oil cooling systems, can’t match the performance of PM motors and require specialist power electronics. Our breakthrough UESM topology and UniSync™ motor eliminates these issues, heralding the way for the replacement of rare-earth permanent magnet motors.
The 4 main Magnetless topologies vs Neodymium & UESM
• Rare-earth free – Eliminates reliance on China, allows localisation and enhances resource efficiency and resilience.
• Controllable excitation – flexible output – The ability to control the motor’s magnetic field by adjusting the current in the rotor’s field windings is a key advantage. This provides flexible control over torque, speed, and power factor. Hence achieving high peak torque and wide continuous power.
• High efficiency – matching PMSM peak and WLTP efficiencies.
• High continuous power over wide speed range
A steady continuous power can be achieved over a speed range extending from the base speed to the maximum speeds.
UESMs are the only magnet-free motors that can match/Exceed PM performance, making it the natural successor to rare-earth machines. We focus on continuous power because that’s what really limits EV performance, efficiency, and cost.
The most common in EVs due to their power density, efficiency and easy to manufacture.
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This is a step change towards supply chain resilience with copper and electric steel only.
You can now eliminate magnets without having to make performance or complexity sacrifices. UESM is a drop-in replacement for PM Motors.
UESM doesn’t just perform better than any other Magnetless Motors. It solves all of the adoption barriers.
Same tech across different applications.
Parts scalable and applicable across different applications.
Conventional Power Electronics, same size and weight, replaces PM motors.
No need for retooling. Compatible with standard manufacturing proceses
UESM technologies go beyond traction motors in passenger electric vehicles, UESM is ideal for any electric machine which requires compact continuous power.
Rare-Earth magnet-free motor without performance compromise, reduced costs motors
Transition to Magnetless fitting existing engine bay constraints – hybrid without platform redesign
Performance, without magnets.
Magnetless motors – Material Security – dual application
PM+ Performance in a magnetless package. Reducing costs, emission and speed to market.
Fully sealed magnetless motors for maximum performance, compactness and reduced costs.
Utilise our ESSG technologies to increase the performance of wind Turbnines while eliminating magnets.
with our magnetless EESM, we unlock:
& a clear path toward next-generation, magnet-free electric motors
