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Mini motors are compact DC servo motors built for applications where space is limited and motion control has to stay precise. The ironless rotor design removes iron core losses and cogging, which keeps the relationship between voltage, speed, current, and load close to linear. That linearity is what makes these motors predictable to control.
Electromate supplies maxon's mini motor range in two families: brushed and brushless. The difference between them comes down to how the motor is commutated, and that one difference changes speed ceiling, service life, and control complexity.
Brushed vs. Brushless Mini Motors: What Is the Difference?
Brushed mini motors use mechanical brushes and a commutator to switch current direction in the rotor windings. Brushless mini motors switch current electronically, using Hall sensors or a sensorless drive scheme. Removing the brushes removes the wear mechanism that limits brushed motor lifespan, and it opens up a much higher speed range. It also means a brushless motor needs a commutation-capable drive to run, where a brushed motor just needs DC voltage applied across two leads.
Attribute
Brushed Mini Motors
Brushless Mini Motors
Commutation
Mechanical, via brushes and commutator
Electronic, via Hall sensors or sensorless control
maxon product lines
A-max, RE, DC-max, DCX
EC, EC-max, EC-i, EC-4pole, EC-flat, ECX Speed, ECX Prime
Speed range
Lower ceiling, line-dependent
Up to 25,000 rpm standard EC line; up to 120,000 rpm on ECX Speed
Service life
Limited by brush wear
Longer, no brush wear component
Electromagnetic interference
Minimal, suits interference-sensitive electronics
Requires shielding consideration due to commutation electronics
Control requirement
Simple, DC voltage only
Requires a commutating drive/controller
Best fit
Cost-sensitive, intermittent duty, EMI-sensitive systems
Continuous duty, high speed, long service life
Brushed Mini Motors
The maxon A-max, RE, DC-max, and DCX series use an ironless rotor to keep inertia low, which gives them fast response and high acceleration. They run with minimal electromagnetic interference, which matters in applications with sensitive nearby electronics. Control is straightforward: apply DC voltage, get proportional speed. Typical applications include robotics, medical devices, portable electronics, and automotive systems where reliability and quick response matter more than raw speed.
The maxon EC family (EC, EC-max, EC-i, EC-4pole, EC-flat) and the ECX Speed and ECX Prime series replace brushes with electronic commutation. That removes the main wear point and extends service life, especially when paired with preloaded ball bearings. Ironless winding avoids cogging torque. Standard EC motors run up to 25,000 rpm; the ECX Speed line is built for up to 120,000 rpm. These motors fit continuous-duty, high-precision applications where a servo drive is already part of the system.
Precision motors with configurable power, high torque density, and minimal vibration. Customizable for optimized performance in demanding applications.
Choosing Between Brushed and Brushless Mini Motors
Choose brushed when cost is the main driver, duty cycle is intermittent, or the application needs simple voltage-based control near EMI-sensitive electronics.
Choose brushless when the application runs continuous duty, needs speeds above what brushed motors handle, or already has closed-loop servo control in place.
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