Advantages of coreless motor

1. High power density

Power density is the ratio of output power to weight or volume. The copper coil type motor is small in size and has good performance. Compared with the traditional coil, the induction coil of the copper coil method is lighter.

There is no need for winding and grooved silicon steel sheets, which eliminates the eddy current and hysteresis loss they generate; the eddy current loss of the copper coil method is small and easy to control, which improves the efficiency of the motor and ensures a higher output torque and output power.

2. High efficiency

The high efficiency of the motor lies in the fact that the copper coil method does not have the eddy current and hysteresis loss caused by the winding and the grooved silicon steel sheet; in addition, the resistance is small, which reduces the copper loss (I^2*R).

3. No torque lag

The copper coil method has no grooved silicon steel sheet, no hysteresis loss, and no cogging effect to reduce speed and torque fluctuations.

4. No cogging effect

The copper coil method has no slotted silicon steel sheet, which eliminates the cogging effect caused by the interaction between the slot and the magnet. The coil has a structure without an iron core. All steel parts either rotate together (for example, a brushless motor) or all stand still (For example, a brushed motor), the cogging effect and torque hysteresis are obviously absent.

5. Low starting torque

No hysteresis loss, no cogging effect, low starting torque. When starting, usually the bearing load is the only obstacle. In this way, the starting wind speed of the wind turbine can be very low.

6. There is no radial force between the rotor and the stator

Since there is no static silicon steel sheet, there is no radial magnetic force between the rotor and the stator. This is especially important in critical applications. Because the radial force between the rotor and the stator will cause the rotor to be unstable. Reducing the radial force will improve the stability of the rotor.

7. Smooth speed curve and low noise

There is no grooved silicon steel sheet, which reduces the harmonics of torque and voltage. At the same time, since there is no AC field in the motor, there is no noise generated by AC. Only the noise caused by the bearing and airflow and the vibration caused by the non-sinusoidal current.

8. High-speed brushless coil

In high-speed operation, low inductance is necessary. The small inductance makes the starting voltage low. By increasing the number of poles and reducing the thickness of the casing, the smaller inductance helps reduce the weight of the motor. At the same time, the power density is increased.

9. Quick response to brushed coil

The brushed motor of the copper coil type has a fast response to voltage fluctuations due to low induction. The rotational inertia of the rotor is small, and the torque is equivalent to the response speed of the current. Therefore, the rotor acceleration is twice that of a conventional motor.

10. High peak torque

The ratio of peak torque to continuous torque is very large, because when the current rises to the peak, the torque constant is constant. The linear relationship between current and torque enables the motor to produce a larger peak torque. In traditional motors, when the motor reaches saturation, no matter how much current is added, the motor torque will not increase.

11. Sine wave induces voltage

Due to the precise position of the coil, the voltage harmonics of the motor are low; and the structure of the copper plate coil in the air gap makes the induced voltage waveform smooth. Sine wave drive and controller can make the motor produce smooth torque. This feature is particularly useful for slow-moving objects (for example, microscopes, optical scanners, and robots) and precise position control, where smooth operation control is the key.

12. Good heat dissipation effect

There is air flow on the inner and outer surfaces of the copper plate coil, which is better than the heat dissipation of the slotted rotor coil. The traditional enameled wire is embedded in the groove of the silicon steel sheet, the airflow on the surface of the coil is small, the heat dissipation is poor, and the temperature rise is large. With the same output power, the temperature rise of the copper coil motor is small.