A cooling fan permanent magnet motor has excellent controllability
the working principle of a cooling fan and its advantages and features: air gap flux density can be greatly improved at the same time, the motor index which can realize the best design, the direct effect is smaller motor, reduction in weight. Not only that, compared with other motor, but also has very good control performance. This is because: first, due to the high performance of permanent magnet motor constant torque, torque to inertia ratio and greatly improve the power density, etc. Through the reasonable design and make the moment of inertia, electrical and mechanical time constant index is greatly reduced, as the main indicator of servo control performance has improved a lot.
second, modern permanent magnet magnetic circuit design has been more perfect, plus high coercive force of permanent magnet material, thus an armature reaction of permanent magnet motor and have also strengthened the ability of resistance to demagnetization, motor control parameters with the external disturbance affects greatly reduced. Third, because of permanent magnets to replace the electric excitation, reduced the exciting winding and the design of the excitation magnetic field, and thus reduce the excitation flux, exciting winding inductance, excitation current, and many other parameters, thereby directly reducing the controllable variables or parameters. Comprehensive above factors permanent magnet motor has excellent controllability, so to speak.
at present it has a lot of big capacity regulating fan air volume using frequency control of motor speed, this kind of frequency converter mainly rely on import, the price expensive. Currently under 1 kw power rating of the fan, especially household air-conditioning fan for permanent magnet brushless dc motor drive, and make use of speed adjustment ways. A great consumption of 1 ~ 10 kw power range of the fan, basic use induction motor drive, and USES the adjusting way of the opening of the tuyere air volume adjustment. For the power within the scope of the fan, driven by permanent magnet brushless dc motor instead of induction motor drive has great superiority.
this is about the related principle of the cooling fan has its advantage characteristics. A cooling fan is used in many industry equipments, there are more information related to the cooling fan is in chi electronics, please continue to pay attention. Tong chi is your professional procurement business, welcome to inquire.