What is a coreless motor in the first place? A thorough explanation in the video #DrivingPrinciple

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basic information

A coreless motor is a type of DC motor (both brushed and brushless) that has no iron core in the rotor. In the case of a brushed DC motor, it has a structure where a cup-shaped coil (rotor) is housed inside the housing, with a cylindrical permanent magnet (stator) inside it. Unlike a conventional motor where the rotor is wound with coils around an iron core, the rotor consists only of coils without an iron core, hence it is called "coreless." *It is sometimes referred to as a slotless motor as well. Since there is no iron core, the rotor is lightweight and has a small moment of inertia (low inertia), which results in excellent responsiveness and acceleration. The absence of an iron core also leads to low inductance and very little electrical noise. Additionally, because the rotor itself does not cause changes in magnetic flux, it is cogging-free, resulting in less vibration and noise, and it excels in controllability. It is compact, highly efficient, and is currently one of the most notable technologies. Like cored motors, coreless motors can also be either brushed or brushless.

Price information

Prices vary from low to high, but generally range from a few thousand yen to tens of thousands of yen. Naturally, the price decreases as the quantity increases. Products with brushes are not that expensive, but brushless ones are generally in the higher price range.

Price range

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Applications/Examples of results

Mobile phones, smartphones, medical devices, precision instruments, military equipment, aerospace, passenger aircraft seat reclining, model trains, FA equipment, AV equipment, cameras, communication devices, measuring instruments, and many others.