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This paper discusses the design of a brushless permanent magnet motor in which the performance requirement is dominated by breakout torque. It discusses the impact of a rotor position feedback error and how it affects the machine sizing in order to overcome breakout torque requirements. It is shown that the brushless AC drive is less sensitive to the position error compared with the brushless DC drive,...
This paper proposes a model of brushless dc motor drive considering behaviour of the motor during commutation and waveform of backemf, for dynamic simulation of Electromechanical Actuator (EMA) under MATLAB/Simulink environment. Ideally trapezoidal backemf is considered in simulations for BLDC motor, which gives a constant torque. Practically, torque ripple exist, mainly due to emf waveform imperfections,...
Direct torque control (DTC) can directly control the inverter states in order to reduce the torque error within the prefixed band limit. DTC of brushless dc drive with trapezoidal back-EMF is presented in this paper. Using the rotor flux vector position in alpha-beta axis stationary reference frame and torque error, the proper switching pattern can be selected to control the generated torque and reducing...
Based on the characteristics of transverse flux permanent magnet machine (TFPM), a novel multi-pole and multi-phase TFPM topology with assembled stator and concentrated flux rotor is presented in this paper. The associated electromagnetic fields of the prototype are investigated by means of three dimension equivalent magnetic network method (3DEMNM). It is shown the unique multi-phase structure of...
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