Hollow cup motors(Micro coreless motor), also known as coreless motors, are a type of electric motor commonly used in small-scale applications such as in model aircraft, drones, and small robots. They offer several distinctive features and advantages:

1. **Coreless Design**: Unlike traditional motors that have a metal core around which coils are wound, hollow cup motors have a coreless design. This reduces their overall weight and inertia, making them suitable for applications where weight and responsiveness are critical factors.

2. **High Efficiency**: Due to their coreless construction, these motors have lower inertia and can achieve higher efficiency compared to cored motors. This efficiency translates into longer battery life in battery-powered devices.

3. **Smooth Operation**: Hollow cup motors typically exhibit smoother operation due to reduced cogging torque (the fluctuating torque caused by the interaction between the rotor and stator magnetic fields in cored motors).

4. **High Power Density**: Despite their small size, hollow cup motors can deliver relatively high power output. This makes them ideal for applications requiring high power density in compact designs.

5. **Low Noise and Vibration**: The absence of a metal core and reduced cogging torque contribute to quieter operation and lower vibration levels compared to traditional cored motors.