The higher the speed of the shaded pole motor, the higher the noise level of the fan. However, the specific amount of noise increase is affected by many factors, including the design and quality of the shaded pole motor and fan, as well as environmental conditions.

The exact amount of noise increase is difficult to determine because it depends on the complex interaction of many factors. Generally, when the speed of the shaded pole motor increases, the fan noise level may gradually increase, but the increase may be nonlinear. This is because fan noise is affected by multiple factors, including air flow noise, mechanical vibration noise, and electromagnetic noise.

The specific increase in noise level also depends on the design and manufacturing quality of the shaded pole motor and fan. Optimized design and manufacturing can reduce the increase in noise level. In addition, environmental conditions (such as the sound insulation performance of the oven) and usage (such as the food in the oven and the cooking process) will also affect the noise level.

In general, the higher the speed of the shaded pole motor, the fan noise level may increase, but the specific increase is affected by a combination of factors. In actual applications, in order to reduce noise, manufacturers usually take measures to optimize the design of the motor and fan, and consider sound insulation and noise reduction technologies to provide products with lower noise levels.