What Are The Advantages Of Hollow Cup Motors?

Micro ironless DC motors use ironless rotors, which have many advantages, such as smaller size and lighter weight than ordinary motors. Here is a brief introduction for you.

1) No torque hysteresis, ironless rotor has no hysteresis loss, reduce speed and torque fluctuation;

2) There is no radial force between the rotor and the stator. There is no radial magnetic force between the rotor and the stator in a DC motor without an iron core. The radial forces of the rotor and stator will make the rotor unstable Reducing the radial force can increase the stability of the rotor;

3) High power density. The power density of a hollow cup motor is the ratio of power output to weight (or volume). The ironless rotor is lighter than the ordinary iron-core rotor, and the eddy current and hysteresis produced by the iron-core rotor are eliminated, improving motor efficiency and ensuring the increase in torque of output and output power;

4) The utilization efficiency is high, the ironless rotor has no eddy current loss or hysteresis loss, and the resistance is very low, which reduces copper loss;

5) low starting torque, because there is no hysteresis loss, no gear effect, low starting torque, bearing load is the only obstacle;

6) The peak torque is high, the ratio between the peak torque and the continuous torque of the micromotor is too large, the torque constant will not change during the process of increasing the current to the peak value and the linear relationship between current and torque can make the motor produce more power. .High peak torque. After the ordinary iron-core DC motor reaches saturation, regardless of the increase in current, the torque will not increase and the original value will remain unchanged;

7) No cogging effect, the ordinary micro motor produces a cogging effect under the interaction between the slot and the magnet, and the ironless DC motor skillfully eliminates this effect, so that the cogging effect and torque lag phenomenon will not exist;

8) Smooth speed curve and low noise. There is no AC field in the micromotor, so there is no AC noise, noise produced by bearings and airflow, and vibration caused by non-sinusoidal currents; reduce torque and harmonic voltage;

9) Quick response. The inductance value of the micromotor is small, the current responds quickly to the voltage fluctuation, the moment of inertia of the rotor is small, and the response speed of torque and current is equal, so that the acceleration of the rotor is about twice that of the ordinary iron-core motor;

10) Good heat dissipation: There is airflow on the surface of the hollow cup rotor, which is better than the heat dissipation performance of the iron core rotor. The enameled wire of the iron-core rotor is embedded in the groove of the silicon steel sheet, the airflow on the surface of the coil is small, and the temperature rise is large. Under the same conditions of output power, the DC cup temperature rise hollow motor is lower.