Shaded pole motors are usually equipped with a single fan blade, but in some cases, multiple fan blades may be required. The following are some situations where shaded pole motors may need to be equipped with multiple fan blades:

1. High heat dissipation requirements: If the heat dissipation requirements of the motor are particularly high, the air volume of a single fan blade may not meet the requirements. In this case, increasing the number of fan blades can increase the air volume and improve the heat dissipation effect.

2. Space joint system: Some application scenarios may have space limitations and cannot use fan blades of different sizes. In order to increase the air volume without changing the size of the fan blades, you can consider increasing the number of fan blades.

3. Noise control: In some applications with high noise requirements, using multiple fan blades can reduce the speed of each fan blade and reduce the noise generated by the fan blades, thereby reducing the overall noise level.

4. Special working conditions requirements: Some special working conditions or specific applications may require higher air volume or better airflow distribution. In this case, increasing the number of fan blades can provide better wind flow characteristics.

It should be noted that increasing the number of fan blades will also increase the load and power consumption of the motor. Therefore, when considering increasing the number of fan blades, higher air volume or better airflow distribution is also required. In this case, increasing the number of blades can provide better wind flow characteristics.

In summary, the need for shaded-pole motors to be equipped with multiple blades usually involves heat dissipation requirements, space limitations, noise control, and special operating conditions. Whether multiple blades are needed should be determined based on specific application requirements and motor design requirements.