What are the components and uses of motor drivers? The following is a brief introduction by blue nine.
The BLDCM manufacturer's BLDCM consists of the motor body and the driver, which is a typical mechatronic product. The stator winding of motor is mostly made of three-phase symmetrical star connection, which is very similar to three-phase asynchronous motor. In order to detect the polarity of the motor rotor, a position sensor is installed in the motor. The driver consists of power electronic device and integrated circuit.
Its functions are: to receive the start, stop and brake signals of the motor to control the start, stop and brake of the motor; to receive the position sensor signals and the forward and reverse signals to control the on-off of each power tube of the inverter bridge to generate continuous torque; to receive the speed command and speed feedback signals to control and adjust the speed; to provide protection and display, etc.
DC brushless motor has fast response, large starting torque, and the performance of providing rated torque from zero speed to rated speed. However, the advantages of DC motor are its disadvantages. Because DC motor needs to produce constant torque performance under rated load, the armature magnetic field and rotor magnetic field must be maintained at 90 ° constantly, which requires carbon brush and commutator.
The carbon brush and commutator will produce sparks and carbon powder when the motor is rotating, which will not only cause damage to the components, but also limit the use occasions. There is no carbon brush and commutator in AC motor, which is maintenance free, robust and widely used. However, to achieve the performance equivalent to that of DC motor, complex control technology must be used. Nowadays, with the rapid development of semiconductor, the switching frequency of power components is much faster and the performance of drive motor is improved.
The speed of microprocessor is also faster and faster. It can realize the control of AC motor in a rotating two axis rectangular coordinate system, and properly control the current component of AC motor in two axes, so as to achieve similar DC motor control and have the same performance as DC motor.