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The coreless motor uses an iron-core rotor, and its performance far exceeds that of traditional motors. It has fast response speed, good control characteristics and servo performance. Coreless motors are usually smaller in size, with a diameter of no more than 50mm, and can also be classified as micro motors.

Features of coreless motors:
Coreless motors have the characteristics of high energy conversion efficiency, fast response speed, drag characteristics and high energy density. Its energy conversion efficiency generally exceeds 70%, and some products can reach more than 90%, while the conversion efficiency of traditional motors is usually less than 70%. Coreless motors have fast response speed and small mechanical time constant, generally within 28 milliseconds, and some products can even be less than 10 milliseconds. Coreless motors operate stably and reliably, with small speed fluctuations and easy control, usually within 2%. Coreless motors have high energy density. Compared with traditional iron core motors of the same power, the weight of coreless motors can be reduced by 1/3 to 1/2, and the volume can be reduced by 1/3 to 1/2.

Coreless motor classification:
Coreless motors are divided into two types: brushed and brushless. The rotor of brushed coreless motors has no iron core, and the stator of brushless coreless motors has no iron core. Brush motors use mechanical commutation, and the brushes can be metal brushes and graphite carbon brushes respectively, which suffer physical losses, so the motor life is limited, but there is no eddy current loss; brushless motors use electronic commutation, which eliminates the loss of brushes and electric current. Sparks interfere with electronic equipment, but there are turbine losses and increased costs. Brushed coreless motors are suitable for industries that require high product sensitivity and reliability. Brushless coreless motors are suitable for applications that require long-term continuous operation and have high control or reliability requirements.