What kind of motor is a coreless motor

As we all know, in the classification of micromotors, there are DC motors, brushed motors, brushless motors, etc. The hollow cup is a special existence, which kind of motor does it belong to?

Some people say that the brushless hollow cup motor is a DC motor, a brush motor, and some people say that it is a brushless motor, a synchronous motor, etc. There are different opinions, so what type of motor is a hollow cup motor?

The following is a brief explanation of Vistar Micromotor. In fact, the hollow cup is a kind of DC permanent magnet motor. It can be brushed or brushless. Compared with ordinary DC motors, it only lacks the iron core. Other structures are not much different from ordinary DC motors.

Structure of hollow cup DC motor

The hollow cup motor is not like other DC motors. It has no iron core and no iron loss, so its efficiency is higher than that of ordinary micro DC motors. Its coil is the rotor, which has a small moment of inertia and is easy to control. The iron core and the coil of the rotor can only be made very thin, otherwise the magnetic flux will be lost, so the power of the hollow cup motor is not large, and the large hollow cup motor can only achieve a few hundred watts.

And the weight of the hollow cup motor is very light (less than 10 grams), like a miniature quadcopter, it is driven by four hollow cup motors to drive the propeller to fly. After a voltage of 3.8V, the load speed is about 3000, and the torque is 5N. The hollow cup motor with the parameter cm can drive the aircraft to fly. This parameter is for reference only.