Investigating the effect of Hall effect sensor position error on BLDC motor torque

In a brushless DC (BLDC) motor control system, Hall effect sensors usually need to provide rotor position and speed information to control the motor position and speed. Hall effect sensors are prone to errors, errors that may occur due to defects in the electrical circuit of the sensors or improper installation of the sensor. Hall effect sensor position error is one of the most common errors caused by possible manufacturing tolerances during the installation process, even if this error does not immediately lead to system failure, it has a long-term effect on the overall performance of the engine. It can also affect torque ripple. In this article, a method for placing the Hall effect sensors at inappropriate angles in the motor driver is presented, so that the effect of the position error of one Hall effect sensor, two Hall effect sensors, and three Hall effect sensors on the torque of this motor can be investigated. In fact, in this review, all types of Hall sensor position errors are evaluated. The analysis is done through simulation in MATLAB and the results are confirmed by measuring the torque ripple coefficient.