Motors for mobility Compact drives for steering, traction and chassis systems

Mobility applications place high demands on performance, weight, installation space, and reliability. Whether electric traction drive, autonomous steering system, or active suspension: motors must deliver high torque in a small space, respond dynamically, and operate reliably even under changing load conditions.

TQ-RoboDrive offers torque-strong frameless motors for mobility that can be integrated directly into the mechanical structure of an application. Different diameters, installation lengths, and winding configurations make it possible to tailor the motor specifically to torque, speed, supply voltage, and installation space. This makes the ILM and ILM-E series suitable for compact and high-performance electric drive solution in various mobility applications.

Which motors are suitable for mobility applications?

Frameless servo motors are particularly suitable for demanding mobility applications. Since the stator and rotor are integrated directly into the customer’s design without their own motor housing, compact drive units can be developed and motor, gearbox, bearing arrangement, sensors, and mechanics can be precisely matched to one another.

Two ILM and two ILM-E motors from TQ-RoboDrive side by side

TQ-RoboDrive offers two scalable motor platforms for this purpose with the ILM and ILM-E series. The ILM series is particularly suitable for applications with high requirements for performance, precision, thermal resilience, and custom design. The ILM-E series is an attractive lightweight and cost-optimized solution, especially for scalable applications and higher production volumes. 

Which series and size is exactly suitable depends on the specific application. A steering drive has different requirements for torque, speed, and dynamics than a drive system or an active suspension.

What are the most important characteristics of motors for mobility?

Maximum torque density

White icon of an arrow inside a circle with a screw on a blue background

In vehicles, electric drives often have only limited installation space available. At the same time, high forces and torques must be generated. High torque density enables high-performance drives in compact dimensions while also supporting a weight-optimized design.
Particularly in steering drives, traction drives, and active suspensions, the ratio of available torque, weight, and installation space is crucial for the design of the overall system.

Scalable portfolio

White icon of a chart on a blue background

Mobility platforms place different demands on the motor depending on vehicle class, axle, and function. A scalable motor portfolio makes it possible to cover different performance levels on a common technological basis. TQ-RoboDrive offers ILM and ILM-E motors with different diameters, overall lengths, and winding configurations. This enables torque, speed, voltage, and installation space to be precisely matched to the respective application.

Long service life and low maintenance requirements

White icon of a crossed-out wrench on a blue background

Drives in mobility applications are often subjected to recurring load changes and long operating times. Long service life and low maintenance requirements are therefore important prerequisites for reliable operation. Frameless servo motors are brushless and do not require mechanically commutated brushes. Depending on the drive concept, the number of mechanical transmission elements can also be reduced. The service life of the overall system is also determined by factors such as bearings, gearbox, thermal behavior, lubrication, and load profile.

Finding the right motor for your mobility application

From highly dynamic steering drives to efficient traction drives and active suspension systems: the right motor solution emerges from the interplay of torque, speed, installation space, weight, thermal performance, gearbox, and control.
Together with you, we select the right ILM or ILM-E motor and tailor size, winding configuration, and integration to the requirements profile of your application. 

Request a free Design Check

 

Which TQ motors do we recommend for which mobility application?

Steering drives and autonomous steering systems

Picture of a black-and-yellow electric race car on the racetrack

Electric steering drives must convert steering movements quickly, precisely, and reproducibly. Especially in autonomous vehicles, the response time and controllability of the drive directly affect the quality of vehicle guidance.

In steer-by-wire (SbW), no permanent mechanical connection between the steering wheel and the steered wheels is required. Steering wheel movement is captured by sensors and transmitted electronically. An electric actuator sets the desired steering angle at the front axle, while another actuator at the steering wheel generates the desired steering or road feedback for the driver.

Torque-dense frameless motor are particularly interesting for these applications because they can be integrated directly into the existing mechanics. This makes it possible to achieve high torque, fast dynamic response, and precise torque control with minimal installation space and weight. This is especially relevant for compact steering actuators and precise steering feedback.

For scalable applications and larger quantities, the ILM-E series can be an economical solution. For particularly high requirements in terms of precision, dynamics, or custom design, the ILM series is more likely to be the right choice.

Electric drive systems

Black-and-blue electric race car, viewed from the side

In electric drive systems, high efficiency, low weight, and high torque density are particularly important. The motor must provide the required drive torque while making the most efficient possible use of the available energy.

The frameless design makes it possible to integrate the motor closely into the existing vehicle structure and the respective drive concept. Size, winding, and gear ratio can be tailored to the application's speed, torque, and operating voltage.

Active suspension systems and driving dynamics systems

Close-up of the undercarriage of a red electric race car

Active suspensions place particularly high demands on dynamics and controllability. The motor must be able to build up forces within a short time and respond precisely to changing driving situations.

In addition to high torque density, a high motor constant, low rotor mass inertia, and dynamic response are particularly relevant here. Different sizes and winding configurations make it possible to tailor the motor specifically to force requirements, speed, and the available supply voltage.

Success stories from mobility

Group photo of the Starkstrom Augsburg Racing Team with a race car in the center

StarkStrom Augsburg: frameless motor for autonomous steering

The Formula Student team StarkStrom Augsburg uses TQ motors in the autonomous steering system of its race cars. The frameless motor enables a compact and lightweight design and precisely converts steering movements in driverless operation. In 2023, the team achieved first place in the Driverless category at Formula Student East. 

Discover the StarkStrom Augsburg success story

Group photo of the TU Fast Team with an electric race car

TUfast Eco Team: efficient motors for a world record vehicle

The TUfast Eco Team at the Technical University of Munich develops vehicles with the lowest possible energy consumption. TQ motors are used in the drive system as well as in the autonomous steering system. With its energy-optimized vehicle, the team achieved a world record of 2,573.79 kilometers on a single battery charge. 

Discover the TUfast Eco Team success story

Group photo of the KA Racing Team at a racetrack

KA-RaceIng: ILM-E for the autonomous steering drive

The Formula Student team KA-RaceIng at the Karlsruhe Institute of Technology uses an ILM-E70×10 frameless motor in the autonomous steering system. In combination with a Harmonic Drive gearbox, the motor enables a compact, lightweight, and dynamic steering unit. In the 2025 season, the vehicle achieved, among other results, second place in the Driverless Cup at Formula Student Germany. 

Discover the KA-RaceIng success story

Group photo of Team High Voltage with an electric race car in the foreground

High-Voltage Motorsports: torque motor for an active suspension system

High-Voltage Motorsports developed a fully active electromechanical suspension for its Formula Student race car. A TQ motor plays a central role in the suspension. Key factors included high torque density, low rotor inertia, and the ability to tailor the motor to the system’s specific requirements. The concept was recognized with the Innovation Award at Formula Student Spain in 2022.

Discover the High-Voltage Motorsports success story

FAQs about motors for mobility

Which motors are suitable for mobility applications?

For demanding mobility applications, compact and torque-strong frameless servomotors are particularly well suited. They can be directly integrated into the mechanical structure and matched to the respective function together with gearbox, bearing arrangement, and sensor technology. Typical applications include electric steering actuators, drive actuators, and active suspensions. TQ-RoboDrive offers ILM and ILM-E motors with different diameters, installation lengths, and winding configurations.

Why are frameless motors suitable for electric steering drives?

Frameless motors are suitable for electric steering drives because they combine high torque density with compact integration and precise controllability. The stator and rotor can be directly integrated into the mechanical structure of the steering unit. This makes it possible to achieve high torque, rapid dynamic response, and precise torque control with a small installation space and low weight. These properties are particularly relevant for compact steering actuators and steering feedback in steer-by-wire systems.

What is steer-by-wire and what role does the electric motor play?

In steer-by-wire (SbW), no permanent mechanical connection between the steering wheel and the steered wheels is required. Sensors detect the movement of the steering wheel and transmit it electronically. An electric actuator sets the desired steering angle at the front axle. Another actuator on the steering wheel generates the desired steering or road feedback for the driver. For both functions, fast response and precise torque control are especially important.

What requirements apply to motors in autonomous steering systems?

Motors for autonomous steering systems must convert steering commands quickly, precisely, and reproducibly. What is especially important are high torque density, dynamic response, low rotor inertia, and precise controllability. The direct integration of a frameless motor helps enable compact and lightweight steering drives. For scalable applications and larger production volumes, the ILM-E series can be a cost-effective solution. For particularly high requirements in precision, dynamics, or custom design, the ILM series is more likely to be the right choice.

What advantages do frameless motors offer as electric traction systems?

Frameless motors enable high torque density and direct adaptation of the motor to the vehicle design. By varying diameters, overall lengths, and winding configurations, the motor design can be matched to torque, speed, operating voltage, and available installation space. For energy-optimized vehicles, motor efficiency and weight are also crucial.

Which motors are suitable for active suspensions?

Servomotors with high torque density, low mass inertia, and dynamic response are suitable for active suspensions. They must be able to build up forces quickly and precisely and respond to changing driving conditions. Depending on the force, speed, and installation space requirements, different ILM or ILM-E sizes with suitable winding configurations can be used. High-Voltage Motorsports, for example, uses a TQ motor in a fully active electromechanical suspension.

-1