Abstract
This paper presents a simple digital control applied to a low inductance 5 kW/48 V three-phase brushless DC motor. Controlling the VSI as a full-bridge converter allowed the use of unipolar switching strategy, increasing the output equivalent frequency up to 100 kHz. The aforementioned strategy has made it possible to control the three-phase currents using a single deadbeat controller without a back-EMF feed-forward compensation. Stability analysis is performed to show that the proposed current control presents good transient response under reasonable parametric variations, as well as zero steady-state error. Precise regulation with no overshoot was obtained using an IP controller to regulate the motor speed. Experimental results are presented to validate the theoretical analysis and to compare with a conventional PI compensator and a predictive controller.
Highlights
Owing to its advantages as high efficiency, long lifetime, low noise and good speed-torque characteristics, Brush less DC motors (BLDC) holds a great share in applications such as household equipment, industries, aerospace and automotive [1]. In relation to the latter category, when BLDC motors are used to drive electric vehicles (EV), they present a good technical superiority when compared with DC, induction and switched reluctance motors [1], [2]
This paper has presented a simple digital control applied to a low inductance 5 kW/48 V three-phase brushless DC motor
Controlling the voltage source inverter (VSI) as a full-bridge converter allowed the use of unipolar switching strategy, increasing the output equivalent frequency up to 100 kHz
Summary
Owing to its advantages as high efficiency, long lifetime, low noise and good speed-torque characteristics, Brush less DC motors (BLDC) holds a great share in applications such as household equipment, industries, aerospace and automotive [1]. Based on the previous analysis this paper proposes a deadbeat current controller to achieve the highest bandwidth ensuring precise tracking over a wide range of the motor speed. The contributions of this paper are the following: i) The design of an effective, with reduced number of loops, digital control of a variable-speed low inductance BLDC motor drive. A deadbeat current controller with integral action taking into account only the computational delay is used to this end This controller ensures robustness under model mismatches without the need of driver’s parameters knowledge. Iii) The design of digital integral-proportional (IP) controller to regulate the motor speed guaranteeing a good transient behavior without overshoot. In this way, this work is organized as follows.
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