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Time：2022-03-17Views：0
The application of cooling fans has been very common in life. What is the variable step motor? Is there a close connection with the cooling fan? Let's take a look at it together: Variable frequency motors have the characteristics of DC motors, but use AC motors. motor structure. That is to say, although the external access is DC, the DC-AC transformer control technology is purchased, and the motor body works completely according to the principle of AC. Therefore, the variable frequency motor is also called "self-controlled variable frequency synchronous motor", and the motor has a speed N that depends on the set frequency F of the controller.
The drive circuit of the variable frequency motor consists of two parts: the main circuit and the control circuit. Now these two parts have been integrated into the same chip, so that only one device can be used to realize all the control functions of the variable frequency motor, which simplifies the circuit structure. With the increasing emphasis on energy saving and noise suppression in the industry, many industrial products tend to use brushless motors, which puts forward higher requirements for motor microcontrollers. As a new generation of motor control DSP chips, the cost-effective TMS320C240 is very suitable for accomplishing this. Task.
The three-phase star connection of the DC cooling fan has a frequency conversion motor control circuit, and the DC power supply supplies power to the three windings of the motor in a time-sharing manner through a three-phase frequency conversion circuit composed of MOS tubes. At each moment, only one of the three pairs of windings has electricity passing through it to generate a magnetic field, then stop supplying power to this pair of windings, and supply power to the other adjacent pair of windings, so that the magnetic field axis in the stator rotates 120 degrees in space. °, the rotor rotates 120° following the magnetic field of the stator under the action of the magnetic force. When the voltage is applied to A+B-, A+C-, B+C-, B+A-, C+A-, C+B- in turn, a rotating magnetic field is formed in the stator, so the motor rotates continuously.
Cooling fan experts know that as long as we disassemble the motor of the DC cooling fan, we can see that the DC cooling fan uses a variable frequency motor, which can be identified from the location of the coil. The frequency conversion motor control circuit board and the control chip will integrate the DSP function and the driving device, which simplifies the circuit structure. By programming the control chip, the motor speed can be changed. More knowledge and information related to cooling fans can be found in Chengda Electronics. If necessary, welcome to inquire and purchase.
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