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DC fan permanent magnet motor has excellent controllability advantages

Time：2022-03-09Views：0

The DC fan supplier Chengda Electronics specializes in the production and sales of various types of motors such as DC fans and cooling fans. Before purchasing, we must first have a certain understanding of the demand products such as DC fans. As far as the editor knows: DC fans mostly use DC brushless motors, and brushless DC motors are greatly simplified in structure because the collector rings and brushes for excitation are omitted. At the same time, not only the manufacturability of the motor is improved, but also the mechanical reliability of the motor operation is greatly enhanced and the service life is increased.

The working principle of the DC fan and its advantages and characteristics: At the same time, the air gap magnetic density can be greatly improved, and the motor index can be optimally designed. The direct effect is that the motor volume is reduced and the weight is reduced. Not only that, it also has very excellent control performance compared with other motors. This is because: First, due to the high performance of the permanent magnet material, the torque constant, torque inertia ratio, power density, etc. of the motor are greatly improved. Through reasonable design, the indicators such as moment of inertia, electrical and mechanical time constants can be greatly reduced, and the main indicators of servo control performance have been greatly improved.

Second, the design of the modern permanent magnet magnetic circuit has been perfected, and the coercive force of the permanent magnet material is high, so the anti-armature reaction of the permanent magnet motor and its anti-demagnetization ability are greatly enhanced, and the control parameters of the motor vary with the external environment. The influence of disturbance is greatly reduced. Third, because the permanent magnets replace the electric excitation, the design of the excitation winding and the excitation magnetic field is reduced, thus reducing the excitation magnetic flux, the excitation winding inductance, the excitation current and many other parameters, thereby directly reducing the controllable variables or parameters. Combining the above factors, it can be said that the permanent magnet motor has excellent controllability.

At present, many large-capacity fans have adopted the frequency conversion speed regulation method to adjust the air volume. This type of frequency converter mainly relies on imports and is expensive. At present, fans with power levels below 1kw, especially fans of household air conditioners, have been driven by permanent magnet brushless DC motors, and the speed and air volume adjustment method is adopted. Fans in the power range of 1~10kw have a huge amount of consumption. They are basically driven by induction motors, and the air volume is adjusted by adjusting the opening of the tuyere. For fans in this power range, the use of permanent magnet brushless DC motor drive to replace the original induction motor drive has great advantages.

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DC fan permanent magnet motor has excellent controllability advantages