Ten advantages of coreless motors

Hollow cup motor is a very widely used drive micro-motor, a combination of many advantages, today to introduce you to the top ten advantages of hollow cup motor

1. High power density: The power density of a hollow cup micro motor is measured as a ratio of output power to weight or volume. Coreless rotors are lighter than conventional iron core rotors because they do not produce eddy currents or hysteresis losses. This increases the efficiency of the micromotor and ensures higher output torque and power.

2. No torque hysteresis: With no hysteresis losses, coreless rotors reduce speed and torque fluctuations.

3. No cogging effect: The coreless DC motor eliminates cogging effect, i.e., there is no torque hysteresis or cogging effect, which can occur in ordinary micromotors due to the interaction between the slot and the magnet.

4. Low starting torque: Since there is no hysteresis loss or slot effect, starting torque is extremely low and bearing load is usually the only hindrance.

5. No radial force between rotor and stator in micromotors: In DC motors without core rotors, there is no radial magnetic force between the rotor and stator. This characteristic can lead to rotor instability in some applications, so reducing this characteristic can increase rotor stability.

6. Smooth speed profile and low noise: Since there is no iron core rotor in a micro motor, the harmonics of torque and voltage are reduced. Only noise from vibrations caused by bearings, airflow and non-sinusoidal currents can be heard.

7. High speed coils: The inductance value parameter of the micromotor is critical for high speed operation, as low values result in low starting voltage. By increasing the number of poles and reducing the thickness of the housing, inductance tables can help micromotors reduce weight while increasing their power density.

8. Fast response: Because the inductance value of a micromotor is low, the current responds quickly to voltage changes, the rotor has a low rotational inertia, and the torque and current response times are comparable. As a result, the acceleration of the rotor is approximately twice that of a standard iron core motor.

9. High peak torque: The ratio of peak torque and continuous torque of micro motor is large because the torque constant is constant during the rise of current to peak, and the linear relationship between current and torque enables micro motor to produce large peak torque. (b) After the ordinary iron core DC motor reaches saturation, the torque of the DC motor will not increase again, no matter the current is increased again.

10. Good heat dissipation: there is air flow 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 silicon steel sheet groove, and there is less airflow on the surface of the coil, so the temperature rise is larger, and the temperature rise of the hollow cup DC motor is smaller under the same power output conditions.

These are the ten advantages of the coreless motor, more information about the Vshida micro motor welcome to consult at any time