The airflow, static pressure, and noise levels of bracket cooling fans are key concerns for users. In most cases, increasing airflow also leads to higher noise levels. Additionally, environmental temperatures fluctuate with the seasons. Higher airflow is needed in summer to meet cooling demands, while lower airflow is sufficient in winter. So, how can we find a balance between performance and noise, and achieve effective speed adjustment? To address this, many fan manufacturers have developed speed-adjustable cooling fans that dynamically adjust the fan speed according to actual usage needs, significantly reducing noise and power consumption. Below are several common methods for adjusting the speed of cooling fans.
Adjusting Supply Voltage for Speed Control
By adjusting the supply voltage, the fan speed can be directly controlled. When the voltage is reduced, the motor speed slows down, resulting in a lower fan speed. This method is simple and effective but may lead to motor instability or reduced efficiency. It is suitable for applications where speed precision is not critical.
Adding a Resistor in the Circuit to Lower Voltage
Inserting an appropriate resistor in the fan's circuit can effectively lower the supply voltage, achieving speed control. This method is cost-effective but generates additional power consumption and may cause poor heat dissipation. It is suitable for smaller fans with lower power requirements.
Automatic Speed Control via Temperature Sensing
Using temperature control, the fan speed can automatically adjust based on real-time temperature changes. For example, when the environment heats up, the fan speed increases to enhance cooling; when the temperature decreases, the fan speed slows down to reduce noise and power consumption. This function typically requires integration of a temperature control module during fan design, making it ideal for equipment that runs continuously and is sensitive to temperature fluctuations.
Application of PWM Speed Control Technology
PWM (Pulse Width Modulation) speed control is an advanced method for regulating fan speed. Through a dedicated PWM control circuit, the fan speed is linearly adjusted based on the duty cycle of the control signal. This method is efficient, precise, and can be used with FG (Frequency Generator) signal feedback to achieve higher speed control accuracy. PWM-controlled fans typically feature a four-wire design, allowing them to be easily adapted to different device requirements.
Additionally, Anpu Electric incorporates this technology into its products through a self-developed PWM signal generator and advanced production equipment, ensuring stable and precise speed control performance.
Advantages of Ruiapple Electric
With 25 years of industry experience, Ruiapple Electric guarantees the reliability and stability of every cooling fan through continuous investment in research and development, as well as equipment upgrades. The company has introduced high-end testing equipment, including high-temperature aging devices, constant temperature and humidity chambers, salt spray test machines, anechoic chambers, and PWM signal generators. This comprehensive testing approach ensures that every stage of fan development and production is covered, offering users a more stable and efficient cooling solution while showcasing Ruiapple Electric’s industry leadership.
Through various speed control methods, users can choose the most suitable solution based on their actual needs. Anpu Electric, always customer-oriented, provides high-quality cooling fans for a wide range of applications, meeting the ever-changing market demands.