Direct current deadbeat predictive controller for bldc motor using single dc-link current sensor

Abstract EN

BLDC motors are characterized by electronic commutation, which is performed by using an electric three-phase inverter.

Thedirectcontrol system of the BLDC motor consists of double loops; including the inner-loop for current regulating and outer-loop for speed control.

The operation of the current controller requires feedback of motor currents; the conventional current controller uses two current sensors onthe ac side of the inverter to measure the currents of two phases, while the third current would be accordingly calculated.

These two sensors should have the same characteristics, to achieve balanced current measurements.

It should be noted that the sensitivity of these sensors changeswith time.

In thecase of one sensor fails, both of them must be replaced.

To overcome this problem, it is preferable to use one sensor instead of two.

The proposed control system is based on a deadbeat predictive controller, which is used to regulate the DC current of the BLDC motor.

Such a controller can be considered as digital controller mode, which has fast response, high precision and can be easily implemented with microprocessor.

The proposed control system has been simulated using Matlab software, and the system is tested at a different operating condition suchaslow speed and high Thedirectcontrol system of the BLDC motor consists of double loops; including the inner-loop for current regulating and outer-loop for speed control.

The operation of the current controller requires feedback of motor currents; the conventional current controller uses two current sensors onthe ac side of the inverter to measure the currents of two phases, while the third current would be accordingly calculated.

These two sensors should have the same characteristics, to achieve balanced current measurements.

It should be noted that the sensitivity of these sensors changeswith time.

In thecase of one sensor fails, both of them must be replaced.

To overcome this problem, it is preferable to use one sensor instead of two.

The proposed control system is based on a deadbeat predictive controller, which is used to regulate the DC current of the BLDC motor.

Such a controller can be considered as digital controller mode, which has fast response, high precision and can be easily implemented with microprocessor.

The proposed control system has been simulated using Matlab software, and the system is tested at a different operating condition suchaslow speed and high speed.