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The direct current fan is the blower which can convert the DC electric energy to the mechanical energy by inputting the DC power and making the DC motor rotate to drive the fan impeller to rotate. The biggest feature of DC blower is the DC motor.
At present, DC fans use brushless DC motor, brushless DC motor because the excitation of the use of the collector ring and brush, the structure is greatly simplified. At the same time, it not only improves the process of the motor, but also increases the mechanical reliability and life of the motor.
At the same time, air gap magnetic density can be greatly improved, the motor indicators can achieve the best design, its direct effect is the motor volume reduction, weight reduction. Not only that, but also has excellent control performance over other motors. This is because: firstly, due to the high performance of permanent magnet material, the torque constant, torque inertia ratio and power density of the motor are greatly improved. Through reasonable design and can make the moment of inertia, electrical and mechanical time constants and other indicators greatly reduced, as the main indicators of servo control performance has been greatly improved. Second, the design of modern permanent magnet magnetic circuit is perfect, plus the coercivity of permanent magnet material is high, so the armature reaction of permanent magnet motor and the ability of resisting demagnetization are greatly strengthened, and the control parameter of motor is greatly reduced with the influence of external disturbance. Thirdly, because the permanent magnet replaces the electric excitation, the design of excitation winding and excitation magnetic field is reduced, so many parameters such as excitation flux, excitation winding inductor and excitation current are reduced, and controllable variable or parameter can be reduced directly. The above factors can be said that the permanent magnet motor has excellent controllability.