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A Comprehensive Guide to Speed Control Methods for DC Fan Manufacturers

Category:

Industry Trends

Release time:

2019-12-11

The editor thinks that, DC fan Currently, there are two methods for adjusting the speed of a fan: one involves regulating the external voltage applied to the fan, and the other involves controlling the speed of the DC fan’s internal logic control circuit. Each of these speed-control methods has its own advantages and disadvantages, which are summarized below:
1. Voltage Regulation of DC Fan External Terminals: This type of speed regulation was widely used in the earliest speed-control schemes. The primary reason it enables speed adjustment is the broad voltage adaptability range of DC fans. This range is exceptionally wide—DC fans can operate normally even at as low as 50% of their rated voltage—and the terminal voltage directly determines the fan speed. Consequently, most early speed adjustments were carried out in this manner. At the same time, this speed-control method is simple and cost-effective.
II. The internal logic control circuit of a DC fan, used for speed regulation: A speed-control signal is applied to the DC fan to achieve speed adjustment. The speed-control signal can be a PWM signal, a Vsp signal, an adjustable resistor, or a temperature-controlled resistor, among others. This speed-regulation method is one of the most advanced speed-control techniques available.
III. Comparison of the Advantages and Disadvantages of Two Speed Regulation Methods:
1. Advantages of terminal voltage speed control: The circuit is simple—speed control can be achieved simply by adjusting the terminal voltage; it offers excellent speed regulation performance and low cost.
2. Disadvantages of terminal voltage speed control: The speed regulation range is limited. The adjustment range of the terminal voltage must ensure that the DC fan can operate normally (typically within 50% of its rated value). This method cannot meet the requirements for speed regulation.
3. The internal logic-based speed control method for DC fans has the advantage of a wide speed regulation range—allowing the speed to be adjusted from 0 up to the DC fan’s maximum speed—while ensuring that the fan’s normal operation at the minimum speed remains unaffected.
4. Disadvantages of internal logic-based speed control in DC fans: The circuit structure is complex and the cost is high. Typically, the interface circuit is designed as a whole in conjunction with the customer’s circuitry.
4. Types of speed-control signals for internal logic control of DC fans: The input signals for speed control mainly include PWM signals, VSP (analog signal) speed-control signals, adjustable resistors, and temperature-controlled resistors. The specific input signal to be selected should be determined based on the signals provided by the customer’s control system.
Shenzhen Jiangshan Lai Electronic Technology Co., Ltd. is a professional manufacturer specializing in the R&D, manufacturing, sales, and service of brushless DC motors, DC cooling fans, brushless DC fans, DC stand fans, boosted cooling fans, miniature cooling fans, DC cooling fans, DC blowers, and custom-standard fans for small and medium-sized enterprises. We are a wholesale manufacturer and supplier of DC fans. Our products enjoy strong sales in Guangdong, Shenzhen, Guangzhou, Dongguan, Fujian, Zhejiang, Jiangsu, and other regions.
 

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