Abstract
The permanent magnet (PM) brushless DC (BLDC) machine has been widely used in various applications due to its high reliability and simplicity. In aerospace applications, the requirements of its dynamic acceleration characteristic and fault protection capability have further increased. This paper proposes an optimized inverter topology composed of a boost converter, two protective power switches, and a three-phase full bridge for the dynamic response improvement and fault protection capability enhancement of PM BLDC machines. The corresponding drive logic, control method, and protection strategy are designed to develop a drive system for an aeronautical fuel pump. The response performance is significantly improved in handling under-voltage and over-rated conditions by utilizing the boost converter during different processes, and the protection capability is enhanced to deal with over-voltage and over-current fault isolation. A boost converter-fed BLDC pump system prototype is built and tested. It is concluded that the simulation and experiment results verify the rationality and validity of the proposed method.
Highlights
Brushless DC (BLDC) machines have the starting characteristics of series-excited DC machines and the speed regulation features of shunt-excited DC machines [1]
This paper proposes a model-based optimized permanent magnet (PM) BLDC machine topology for dynamic response enhancement and fault protection improvement
Under the continuous current mode (CCM) condition, the boost converter-fed BLDC motor operates in two states and the state–space equations can be expressed as [21]
Summary
Brushless DC (BLDC) machines have the starting characteristics of series-excited DC machines and the speed regulation features of shunt-excited DC machines [1] They are commonly used in aerospace, industrial control, robotics, electrical vehicles, office automation, and domestic appliances for their simple construction, high output torque, efficiency and reliability [2]. The research in [19] concentrated on the design of a four-quadrant operation simulation model of a BLDC machine to reduce torque ripples, but the speed range expansion and fault protection were not examined. This paper proposes a model-based optimized permanent magnet (PM) BLDC machine topology for dynamic response enhancement and fault protection improvement. The topology is composed of a boost converter, two power switches for protection, and a three-phase full bridge inverter. A simulation model and experimental prototype are constructed and manufactured to validate the proposed topology and control method for an aeronautical fuel pump system
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