The main methods to improve the efficiency of shaded-pole gearbox motors are:

1. Optimize motor design:

- Select high-performance motor materials, such as high-magnetic permeability silicon steel sheets, high-performance permanent magnet materials, etc.

- Rationally design the motor geometry, optimize the magnetic circuit structure, and reduce iron loss.

- Optimize the stator winding design to reduce copper loss.

2. Improve the manufacturing process:

- Improve the material processing accuracy and assembly accuracy, and reduce mechanical loss.

- Use advanced manufacturing processes, such as precision injection molding, die casting, etc.

3. Optimize the motor control system:

- Use high-performance power electronic equipment, such as IGBT, thyristor, etc.

- Optimize the motor drive control strategy, such as vector control, sensorless control, etc.

- Use advanced speed regulation technology, such as PWM variable frequency speed regulation.

4. Strengthen motor maintenance:

- Regularly check the wear of various motor components and replace worn parts in time.

- Keep the motor operating environment clean to reduce the entry of impurities such as dust.

- Perform necessary maintenance and repairs on the motor to ensure its stable performance.

In short, the energy conversion efficiency of the shaded-pole gearbox motor can be continuously improved by taking into account the motor body design, manufacturing process, control system, maintenance and other aspects.