Abstract
This paper is focused in the development of a parallel control loop of the angular velocity and torque for Brushless Direct Current (BLDC) motors. This parallel loop is proposed as an improvement for the performance of those cascaded solutions commonly reported in the body of literature of the field. Performance is improved by reducing the steady state error of the speed considerably when compared with the typical cascaded loop solution under a commanded change of torque. In addition, the steady state response of the parallel loop is reached in a shorter time. Simulations were designed to carry out a comparison between both methodologies. The results of these simulations consider only changes in the set point for speed or torque and are reported here. The control signal was applied to a simulated driver using a switching method known as Direct Torque Control of 2 and 3 phases (DTC-2+3P). These preliminary results show that the parallel control loop outperforms the cascaded control of BLDC motors.
Highlights
Brushless Direct Current (BLDC) motors are currently one of the most used motors in the industry, covering several applications
BLDC motors stand out for two fundamental characteristics: the first one is that the magnetic field of the rotor is generated through permanent magnets, allowing a considerable reduction in heating due to losses of Joule effect, as well as allowing the reduction of its size without the risk of failure; the second one is that the commutation of the stator windings is done electronically, using power transistors, which allows elimination of the disadvantages of the mechanical commutation, reducing the maintenance cycles, as well as the elimination of the losses and of the electromagnetic interference generated by the commutation
The simulated power driver was based on the Direct Torque Control (DTC)-2+3P commutation configuration, which is an improved commutation technique over the DTC-2P and DTC-3P configurations
Summary
Brushless Direct Current (BLDC) motors are currently one of the most used motors in the industry, covering several applications. BLDC motors stand out for two fundamental characteristics: the first one is that the magnetic field of the rotor is generated through permanent magnets, allowing a considerable reduction in heating due to losses of Joule effect, as well as allowing the reduction of its size without the risk of failure; the second one is that the commutation of the stator windings is done electronically, using power transistors, which allows elimination of the disadvantages of the mechanical commutation, reducing the maintenance cycles, as well as the elimination of the losses and of the electromagnetic interference generated by the commutation. In order to improve BLDC performance, four areas of research are currently being pursued: improvement on manufacturing materials, power electronic drivers, feedback sensors, and control techniques. The main purpose of this work was centered on the study of control techniques for simultaneous control of speed and torque. Simultaneous control of motor speed and torque are required in a variety of applications
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