Adam Powrózek

An analysis of properties of the BLDC motor for unmanned aerial vehicle hybrid drive

The paper presents an analysis of a brushless dc motor (BLDC) design solution to be used in the hybrid drive for an unmanned aerial vehicle (UAV), where the designed machine can be operated as the combustion engine starter, generator, and motor. Solutions with external rotor are preferred due to necessity of minimization of the machine weight. Relatively low value of the supply voltage requires that parallel connections within each of the motor phases should be adopted. When selecting optimum pole-arcs of permanent magnets, the relevant analysis concerns not only their influence on the generated cogging torque, electromagnetic torque, and induced voltage, but also circulating currents resulting from the assumed configuration of stator windings. Waveforms of currents, voltages, and the electromagnetic torque are determined for a selected motor working point. Finally, conclusions concerning the analyzed motor are presented.

An analysis of operation of brushless DC machine used in unmanned aerial vehicle hybrid drive

This paper presents results of a study concerning operating modes of brushless DC machine (BLDCM) used in the hybrid drive designed for unmanned aerial vehicle (UAV). A mathematical model of the machine and a simulation model of the whole drive system are proposed. Structure of the parallel hybrid drive system is discussed. Results of simulations are presented for three different operation modes provided for the machine in the UAV drive system, i.e. engine starting, motoring operation with regulated airscrew speed, and generating operation. Finally, preliminary results of laboratory tests are presented.

A two-phase switched reluctance motor with asymmetrical rotor for a high-speed drive

The paper presents results of simulations and laboratory tests of a switched reluctance motor (SRM) designated to a high-speed drive. As the solution, a two-phase 4/2 motor has been proposed with asymmetric magnetic circuit of the rotor. The asymmetry was introduced intentionally in order to obtain the possibility to start the motor from any rotor position. Starting the motor from various initial rotor positions was tested in laboratory conditions. Further, the influence of control parameters on performance of the motor was analyzed.

A two-phase switched reluctance motor with reduced stator pole-arc

The paper presents analysis of a 4/2 switched reluctance motor design solution with reduced stator pole-arc. The analyzed model is designed to be used in a high-speed (45,000 rpm) drive. The stator pole-arc value change was accompanied by asymmetric structure of rotor magnetic circuit to allow start the motor from any rotor position. Static characteristics of the designed motor have been determined. Based on a field/circuit model, waveforms of currents, voltages, and the electromagnetic torque were determined. Exemplary torque characteristics, current and voltage waveforms were determined in laboratory conditions. Finally, conclusions concerning the designed machine with reduced stator pole-arc were presented.

Research of influence of open-winding faults on properties of brushless permanent magnets motor

Abstract The paper presents an analysis of influence of selected fault states on properties of brushless DC motor with permanent magnets. The subject of study was a BLDC motor designed by the authors for unmanned aerial vehicle hybrid drive. Four parallel branches per each phase were provided in the discussed 3-phase motor. After open-winding fault in single or few parallel branches, a further operation of the motor can be continued. Waveforms of currents, voltages and electromagnetic torque were determined in discussed fault states based on the developed mathematical and simulation models. Laboratory test results concerning an influence of open-windings faults in parallel branches on properties of BLDC motor were presented.

An analysis of influence of open-winding faults on properties of brushless DC motor with permanent magnets

The paper presents an analysis of influence of selected fault states on properties of brushless DC motor with permanent magnets. The subject of study was BLDC motor designed by the authors for unmanned aerial vehicle hybrid drive. Four parallel branches per each phase were provided in the discussed 3-phase motor. After open-winding fault in single or few parallel branches, a further operation of the motor can be continued. Waveforms of currents, voltages and electromagnetic torque were determined in discussed fault states based on the developed mathematical and simulation models. Laboratory test results concerning an influence of open-windings faults in parallel branches on properties of BLDC motor were presented.