•  Housing which guides the magnetic field and acts as a magnetic return path.

•  A hollow cylinder, also called a basket, with copper coils wound in a self-supporting honeycomb or skewed pattern.

• The permanent magnet fits inside the basket and therefore sits inside the rotor. An air gap separates the magnet and the housing. The magnet produces the magnetic field.

•  Brushes and commutators are usually made of precious metals.

2.Advantages and Disadvantages of a Coreless Motor

•  The high efficiency is paired with a compact design that is lighter compared to many other motors on the market. Core-less motors typically have less current loss, making them more efficient overall than the types with iron cores.

•  Low draw current: It does not draw as much current as some other motors, so when powered by a battery, the battery will last longer.

•  Because the Core-less motor has a lighter rotor, it does not cause as much inertia as other motors, so acceleration and deceleration can be handled quickly.

•  No cogging，core-less motors do not create a misalignment of the rotor and stator magnetic circuit. This means that the motor can run very smoothly.

•  Safe and durable, since there is no iron core, there is less chance of arcing and sparking between the brushes and commutator as often happens in cored motors, there will not be much electromagnetic interference (EMI), and the hollow cup motor will have a longer service life.

•  Easy to control, users can easily control the motor and manage its speed.

•  Low noise level and quiet operation.

Disadvantage：

In a core-less electric motor there’s no heat sink for the winding, so to cool the machine down, your DC motor’s housing must have good thermal conductivity. This is especially important if your motor will often speed up and slow down in rapid succession.

3.The Many Applications of Core-less Motors

•  The healthcare industry

•  Robotics

•  Automation & Actuators

•  Laboratories

•  Office equipment