What are the advantages of hollow cup motors compared to ordinary DC motors.
The structure of the hollow cup motor breaks through the rotor structure of traditional motors and adopts a coreless rotor, also known as a hollow cup rotor. This new rotor structure completely eliminates the power loss caused by eddy currents formed by the iron core. So what are the advantages of hollow cup motors compared to ordinary DC motors?
1. High power density
Power density is the ratio of output power to weight or volume. Copper coil motor has a small volume and good performance. Compared with traditional coils, the induction coil of copper plate coil mode is lighter. No need to wrap or slot silicon steel sheets, eliminating the eddy currents and hysteresis losses they generate; The eddy current loss in the copper coil mode is very small and easy to control, which improves the efficiency of the motor and ensures higher output torque and power.
2. Efficient
The efficiency of the motor lies in the absence of eddy current and hysteresis losses caused by winding and slotting silicon steel sheets in the copper plate coil method. In addition, the resistance is small, reducing copper loss.
3. No torque hysteresis
Copper coil mode without slot silicon steel sheet, no hysteresis loss, no cogging effect to reduce speed and torque fluctuations.
4. No slot effect
The copper coil is made of seamless silicon steel sheets, eliminating the slot effect caused by the interaction between slots and magnets. A coil is a structure without an iron core. All steel components either rotate together (such as brushed motors) or remain stationary (such as brushless motors). The slot effect and torque hysteresis phenomenon are clearly absent.
5. There is no radial force between the rotor and stator
Because there is no stationary ferrite core, the axial magnetic field between the motor rotor and stator cannot be found. This is particularly important in critical applications. Due to the axial force between the motor rotor and stator, the motor rotor may become unstable. Reducing axial force will improve the reliability of the motor rotor.
6. Smooth speed curve and low noise
The ferrite core without slots reduces the harmonics of torque and operating voltage. Because no AC field can be found inside the motor, there is no noise caused by AC. Only noise caused by rolling bearings and cyclones, and vibration caused by non sinusoidal waveforms.
7. Good heat dissipation effect
Copper coin electromagnetic coils often have gas flow on the inner and outer surfaces, which is better than the heat pipe heat dissipation of slotted motor rotor electromagnetic coils. The traditional wrapped wire is embedded in the slot of the ferrite core, and there is very little cyclone on the surface of the electromagnetic coil, resulting in poor heat dissipation of the heat pipe and high temperature. For the same power, the temperature of the copper coin electromagnetic coil method motor is lower.
