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DC motors are widely used in micro drive systems for automation, consumer electronics, and robotics, thanks to their simple structure and easy control. In this article, SGMADA introduces the three most common types: brushed DC motors, BLDC inner rotor motors、 そして BLDC outrtunner motor.
01｜（Brushed DC Motor）
Brushed DC motors are among the most commonly used micro motors on the market. The 36mm DC-555 series showcased here features a mature design and simple two-lead control.
However, the internal carbon brush, responsible for commutation, wears over time and may produce sparks, limiting the motor’s lifespan to several hundred to around a thousand hours. This makes it unsuitable for medical or explosion-proof applications.
02｜（Brushless DC Motor – Inner Rotor）
To address the limited lifespan caused by carbon brush wear, we recommend switching to brushless DC motors. For example, SGMADA’s BL3657 series features electronic commutation, replacing traditional carbon brushes and offering significant advantages:
- Longer lifespan — typically over 10,000 hours
- Higher efficiency — improved energy conversion
- Spark-free operation — safer and more reliable
Structurally, BLDC motors include an additional control terminal for connection to a dedicated driver or control board. They are ideal for industrial and household applications that demand long service life そして low maintenance.
03｜（Brushless DC Motor – Outer Rotor）
Unlike inner rotor motors, outer rotor motors have the rotor integrated into the housing, with magnets attached to the rotating shell. This “stator-inside, rotor-outside” design offers two key benefits:
- Flatter profile, ideal for space-constrained installations
- Higher output torque, thanks to greater rotational inertia
These motors are widely used in ice makers, power tools, and other applications requiring コンパクトサイズ そして strong starting torque. As a rapidly growing segment of brushless motors, they are increasingly favored in modern designs.
Conclusion: How to choose a suitable micro DC motor?
In addition to the three DC motors introduced today, micro motors also include:
Servo motor
Stepper motor
AC induction motor
AC Shaded pole motor, etc.
When choosing a motor, you should choose it based on comprehensive factors such as the use environment, control requirements, cost, and life. SGMADA is committed to providing customers with micro drive solutions of various specifications and supporting customized services.
