real success demands more than shrinking hardware— it requires careful consideration of motor selection, uncompromised manufacturing precision and the support of custom design solutions.
and other advanced thermal management features.
Chris Handcock, design lead at drive system supplier Electro Mechanical Systems,
automatically deliver output as larger ones. To meet the same standards, engineers must carefully consider factors like torque output, power density, loadhandling capability and energy efficiency. Smaller motors tend to have lower torque, meaning that designers may need to compensate with gearing, high-performance materials or alternative motor types.
Here, selecting the correct micro motor technology becomes critical. For example, coreless DC motors may suit applications where dynamic response and low inertia matter, such as medical or robotic systems. On the other hand, brushless DC motors, like those from FAULHABER, may provide a better balance of efficiency, lifespan and power-to-weight ratio for aerospace applications.
Although they offer precise control, stepper motors can be less efficient and more challenging to integrate at very small scales. In each case, motor type, winding geometry, magnet strength, gearheads, feedback systems and controls must be tuned to ensure performance without exceeding the constraints imposed by size.
Achieving precision through custom design
Another engineering challenge that presents with miniaturisation is thermal management. As motors get smaller, they lose surface area relative to the amount of heat they generate. High power density in a compact space can lead to heat accumulation, which can degrade performance, reduce efficiency and damage components.
To mitigate this, designers must address heat as an integral part of the design process rather than as an afterthought. Solutions could include optimising magnetic materials, improving insulation, designing housings or airflow paths to aid heat dissipation, or embedding thermal sensors. In some cases, compact systems might incorporate heat-spreading housings, micro-cooling channels
Addressing these considerations at the start of a concept is essential, as thermal limitations can dictate the performance envelope of a miniature motor. This is where precision manufacturing becomes crucial. Off-the-shelf motors and gear systems are often unable to meet the tight spatial, mechanical and performance constraints associated with tiny applications.
For bespoke solutions, consider selecting a partner such as EMS, which provides a comprehensive custom design and manufacturing service, from its UK based facility.
Miniaturisation is reshaping engineering, but consequently driving new expectations for performance, efficiency and design across every sector. Small, lightweight components now unlock capabilities that once seemed impossible. But real success demands more than shrinking hardware— it requires careful consideration of motor selection, uncompromised manufacturing precision and the support of custom design solutions.
To learn more about the custom design service provided by EMS, visit the website or get in touch with a member of the team.
For further information, please visit www. ems-limited. co. uk
Issue 81 PECM 49