China bldc motor manufacturers, brushless DC motor control of the key is the current and magnetic field direction should be consistent, if not, the same current will be a included Angle cosine discount, that is, the power factor reduced, part of the energy as heat consumed in the windings of the motor.To achieve this, a sinusoidal modulation pulse width control can be used (provided that the inverse potential characteristics of the motor are also sinusoidal).Also, considering the parasitic inductance of the winding, it is possible to get a little ahead of the curve in the drive waveform, and of course it is quite complex to implement these software.Brushless DC motor not only maintains the good dynamic and static speed regulation characteristics of traditional DC motor, but also has simple structure, easy operation and easy control.Its application from the initial military industry, to aerospace, medical, information, home appliances and industrial automation rapidly developed.
In terms of structure, the stator winding of brushless DC motor is used as the armature, and the excitation winding is replaced by permanent magnet material.According to the current waveform flowing into the armature winding, the BRUShless DC motor can be divided into square wave DIRECT current motor (BLDCM) and sinusoidal wave direct current motor (PMSM). BLDCM replaces the mechanical phase commutation of the original DC motor with electronic phase commutation. The permanent magnet is used as the rotor, which saves the brush.PMSM uses permanent magnet to replace the excitation windings in the rotor of synchronous motors, eliminating the need for excitation windings, slip rings and brushes.Under the same conditions, it is relatively easy for the drive circuit to obtain square waves, and the control is simple. Therefore, BLDCM is more widely used than PMSM
