Motor with amorphous steel stator achieves ‘leading’ 98.2% efficiency

10 March 2026  

Horse Powertrain says that its amorphous motor could cut fuel consumption by 1%

A London-headquartered developer of low-emission powertrains has announced an electric motor that uses thin sheets of amorphous (non-crystalline) steel alloy for its stator, resulting in “industry-leading” efficiency levels of 98.2%. Horse Powertrain – which is 45% owned by Renault Group, 45% by the Chinese car-maker Geely, and 10% by Aramco – says that amorphous motor, aimed at hybrid transmission systems, will cut vehicle fuel consumption by 1%.

Amorphous steel is characterised by its high conductivity, durability, strength and magnetic permeability. Exploiting these properties, Horse Powertrain has reduced the thickness of the steel layers that make up a motor stator to just 0.025mm – one tenth the thickness of the steel laminations used in traditional motors.

Using the highly conductive material, the motor’s stator losses are said to be half those of comparable conventional motors, allowing it to achieve a claimed efficiency of 98.2%, while outputting its maximum power of 140kW at 360Nm.

Horse Powertrain calculates that hybrid electric vehicles using the amorphous motor in their powertrains will see a 1% reduction in fuel and power consumption compared to those using existing motor designs, helping car-makers deliver a new generation of low-emission vehicles.

“The Amorphous Motor is an ideal tool to power a new generation of high-efficiency range extended EVs, hybrids, and plug-in hybrids, ensuring these technologies continue to play a substantial role in automotive’s decarbonisation journey,” says Horse Powertrain’s deputy chief technology officer, Ingo Scholten.

Horse Powertrain develops hybrid and combustion powertrains including engines, transmissions, power electronics and integrated hybrid platforms. It consists of two divisions – Aurobay Technologies and Horse Technologies – and has 17 manufacturing plants, five R&D centres, and 19,000 employees, located around the world. The company has 20 customers, including some of the world’s leading car-makers.

Horse Powertrain:  LinkedIn