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  • What is coreless DC motors?



  • Coreless DC motors belongs to DC permanent magnet servo and control motor, which can also be classified as micro special motor. The hollow cup motor has outstanding energy saving characteristics, sensitive and convenient control characteristics and stable operation characteristics, and the advanced technology is very obvious. As a high-efficiency energy conversion device, it represents the development direction of motor in many fields. DC Micro Motor, DC permanent magnet servo and control dc motor design .




    The structure of hollow cup motor breaks through the rotor structure of traditional motor, and adopts coreless rotor, coreless brushless motor, brushless coreless motor, coreless dc motors, also known as hollow cup rotor. This novel rotor structure completely eliminates the power loss caused by eddy current formed by iron core. Small Coreless Motor


    At the same time, its weight and moment of inertia are greatly reduced, so as to reduce the mechanical energy loss of the rotor itself. Due to the structural change of the rotor, the operating characteristics of the motor have been greatly improved. It not only has outstanding energy-saving characteristics, but also has the control and driving characteristics that can not be achieved by the iron core motor.




    Classification of hollow cup motor:


    The hollow cup motor is divided into two types: brush and brushless. The rotor of the brush hollow cup motor has no iron core, and the stator of the brushless hollow cup motor has no iron core.

  • A typical brushed DC motor consists of an outer stator, typically made of either a permanent magnet or electromagnetic windings, and an inner rotor made of iron laminations with coil windings. A segmented commutator and brushes control the sequence in which the rotor windings are energized, to produce continuous rotation.




  • Coreless DC motors do away with the laminated iron core in the rotor. Instead, the rotor windings are wound in a skewed, or honeycomb, fashion to form a self-supporting hollow cylinder or “basket.” Because there is no iron core to support the windings, they are often held together with epoxy. The stator is made of a rare earth magnets, such as Neodymium, AlNiCo (aluminum-nickel-cobalt), or SmCo (samarium-cobalt), and sits inside the coreless rotor.



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