ZF has introduced a new high-speed electric drive system designed to make electric vehicles lighter, more compact and potentially more affordable. Called the High Revolution Drive, the innovative 3-in-1 system can reach speeds of up to 30,000 rpm while delivering the same power as conventional electric drives with a significantly smaller and lighter design.
The new technology could help automakers improve vehicle efficiency, reduce production costs and make better use of valuable space inside electric vehicles. ZF is targeting the high-volume passenger car market, with power outputs ranging from approximately 150 kW to 200 kW.
Unlike conventional electric motors, which typically operate at lower rotational speeds, ZF’s new system uses extremely high motor speeds combined with a specially developed two-stage transmission to deliver the torque required at the wheels.
How ZF’s 30,000-RPM Electric Drive Works
The main idea behind the High Revolution Drive is relatively straightforward. At the same power output, a faster-spinning electric motor requires less torque. Because the torque requirement is closely connected to the size of the rotor, increasing rotational speed allows engineers to develop a smaller and lighter electric motor.
However, the reduced motor torque must be converted into sufficient torque to drive the wheels. ZF achieves this through a two-stage spur gear transmission with an approximately 18:1 gear ratio.
The system integrates the electric motor, power electronics and transmission into a compact 3-in-1 package. The configuration presented by ZF delivers up to 200 kW of peak power and 3,500 Nm of peak torque at the wheels.
According to Thomas Meiser, Head of ZF’s E-Mobility Business Unit, the system relies on the coordinated development of all major components rather than optimizing individual parts independently.
This integrated approach is particularly important at rotational speeds of up to 30,000 rpm, where controlling heat, vibration, noise and mechanical stress becomes increasingly challenging.
Nearly 25% Smaller and Lighter Than Conventional Electric Drives
One of the most significant advantages of ZF’s High Revolution Drive is its reduced size and weight.
Compared with a comparable ZF SELECT electric drive operating at 18,000 rpm, the new system is nearly 25% smaller and almost 25% lighter.
The electric motor also requires approximately 50% less magnet material. This is an important development because permanent magnets often rely on rare-earth materials, which can expose automakers to supply-chain risks and fluctuating material costs.
Reducing magnet requirements could therefore help lower manufacturing expenses while making electric vehicle production less dependent on critical raw materials.
Despite its higher rotational speed and additional transmission requirements, ZF says the system achieves an efficiency of nearly 93%, comparable to the conventional SELECT drive used as a reference.
The lower overall weight could also contribute to improved electric vehicle range, although actual gains will depend on the vehicle’s design, battery capacity and driving conditions.
ZF Addresses Noise and Vibration Challenges
Operating an electric motor at 30,000 rpm creates engineering challenges that go beyond simply increasing rotational speed.
Higher speeds can amplify noise, vibration and mechanical stress, particularly within the transmission and its bearings. These issues are important for passenger vehicles, where quiet operation and long-term reliability are essential.
ZF says it has addressed these challenges by developing the electric motor, gearing, bearings and gear tooth geometry as one integrated system.
The company has drawn on its extensive experience in transmission and gear development to maintain low noise and vibration levels while ensuring durability.
According to ZF, 30,000 rpm represents the most attractive balance between technical performance and economic feasibility for the configuration currently presented.
Compatible With 400V and 800V Electric Vehicle Platforms
ZF is positioning the High Revolution Drive for mainstream electric vehicles rather than limiting it to expensive performance models.
The architecture is designed for power outputs of approximately 150 kW to 200 kW and can be adapted for different performance requirements.
It also supports both 400-volt and 800-volt electrical architectures, giving automakers greater flexibility when developing future electric vehicle platforms.
Another important advantage is that the new drive builds on ZF’s existing modular SELECT platform.
Instead of developing an entirely new electric drive system from scratch, the company can reuse established technologies and adapt the architecture to different customer requirements. This approach could reduce development time, keep costs more predictable and make it easier for automakers to integrate the technology into future vehicles.
ZF Targets Electric Vehicle Production by 2030
ZF is already in discussions with several automakers about the High Revolution Drive and is targeting production by 2030.
If the technology reaches mass production, it could provide automakers with another way to reduce electric vehicle weight, improve packaging efficiency and lower dependence on expensive magnet materials.
The nearly 25% reduction in size and weight is particularly interesting for manufacturers looking to improve vehicle efficiency without sacrificing power output.
However, the real impact will depend on production costs, long-term durability and how successfully the technology can be integrated into different vehicle platforms.
