• Q1: Cooling fan brushless motor or brush motor which is less noise
  • A:

    Today we are going to discuss the problem is the heat dissipation fan in the brushless motor and brush motor which noise is less.

    Brushless motors are less noisy than brushless motors. Brushless motors operate by controlling electromagnetic fields electronically, eliminating the need to use traditional brushes and commutators, thereby reducing mechanical friction and vibration, and thus reducing the possibility of noise generation. Therefore, for cooling fans, brushless motors have the advantage of less noise than brushless motors.

    During the operation of the brush motor, due to the friction between the carbon brush and the commutator, it will produce a large noise. This noise not only affects the user experience, but can be a problem in some environments where quiet is required.

  • Q2: What is special about DC motors
  • A:

    1.High efficiency: DC motor has less energy loss in the energy conversion process and higher energy conversion efficiency.

    2. The DC motor is reversible, that is, the rotation direction of the motor can be changed by changing the direction of the current.

    3.Good speed regulation: DC motor has good speed regulation performance. The precise speed control of DC motor can be realized by changing the parameters of power supply voltage, current and magnetic field intensity.

    Our company not only produces electric dc motor, but also produces various types of fans such as exhaust fans, you can choose.

  • Q3: Which is noisier, oil bearing or ball-bearing cooling fan?
  • A:

    Ball-bearing cooling fans provide better stability and reliability at high speeds and therefore may produce lower noise levels in some cases.

    Oil bearing fans usually use grease lubricated bearings, which reduce friction and noise. However, after a long period of use, oil lubrication may gradually consume or degrade, resulting in a gradual increase in fan noise.

    In general, the  ball-bearing cooling fan may produce a lower noise level when it is continuously operated at high speed, but the specific noise difference should also consider other factors, such as the design and quality of the fan. At the time of purchase, it is recommended to refer to the technical specifications provided by the manufacturer or user evaluation to choose a low noise cooling fan suitable for your needs.

  • Q4: The role of diodes and triodes
  • A:

    The diodes and transistors in the cooling fan are circuit components used to control and regulate the fan, and their roles are as follows:

    Diode: A diode is an electronic component. In the circuit of the cooling fan, the diode is usually used in the bridge rectifier circuit. When the AC signal is input, the diode converts it into a DC signal for use by the DC fan. By using diodes for rectification, you can ensure that the fan motor will work properly and that the power transfer is more efficient.

    Triode: A triode is a commonly used semiconductor device. In cooling fans, triodes are usually used to control the speed of the fan or to regulate the voltage of the fan. By changing the working state of the transistor, the speed of the fan can be adjusted, so as to control the air volume and noise level of the fan.

    All in all, the diodes and transistors in the cooling fan play a key role in the circuit. The diode is used to rectify the current and ensure the normal operation of the fan and motor; The triode is used to control the fan speed, regulate the voltage and provide protection, so as to achieve the control and safe operation of the fan.

  • Q5: Function classification of DC cooling fan
  • A:

    The common functions of DC fans are as follows:

    PWM function: PWM is actually to control the output voltage or current of the circuit by changing the pulse width, so as to achieve the speed control of the motor.

    FG speed measurement function: The function of this function is mainly to output a square wave signal from the inside of the fan, and the frequency of the signal represents the speed of the fan, that is to say, the speed of the fan can be read by reading the FG signal.

    RD function: By monitoring the level of RD signal to determine whether the fan is running normally or the lock state.

    TC temperature control: Monitors the ambient temperature of the fan through the thermistor. Adjust the fan speed according to the temperature.

    We can make the fans of these four functions according to the needs of customers. Guangdong Chungfo Electronic Technology Co., Ltd specializes in the production of DC/AC/EC fans, cross-flow fans, motors, wire & cable for more than 20 years, through CE, UL, CUL, TUV, SGS, RoHS and other certifications. Welcome major fan buyers to come to consult and understand.

  • Q6: What is PWM technology for DC fans?
  • A:

    PWM refers to Pulse Width Modulation, an electronic control technique in which a PWM signal periodically outputs a voltage for a specific period of time, known as a duty cycle, usually expressed as a percentage.

    In fact, PWM is actually to control the output voltage or current of the circuit by changing the pulse width, so as to achieve the speed control of the motor.

    Dc fan to achieve PWM control, there are three steps, the first is the design of the control circuit, then the generation of PWM signal, and finally the output of PWM signal.

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