Stationary plane based investigation of the behavior of PM BLDC drives

The paper investigates the behavior of permanent magnet (PM) brushless DC (BLDC) drives in the stationary plane. The vectors of the phase currents and back-emfs are first drawn under ideal square-wave current supply. Development of a constant torque from the motor is explicated with the help of the vector representation. Trajectories of the tips of the motor current and voltage vectors are then traced for various motor speeds taking into account the phase commutations. Torque developed by the motor and its ripple are determined from the vector tip trajectories. Theoretical findings are supported by simulation results obtained by using the data of a PM BLDC drive designed for the propulsion of electric vehicles.

[1]  Fumio Harashima,et al.  A new approach for minimum-torque-ripple maximum-efficiency control of BLDC motor , 2000, IEEE Trans. Ind. Electron..

[2]  M. Bertoluzzo,et al.  Brushless DC drive operation during phase commutation under various switching patterns , 2009, 2009 IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives.

[3]  M. Lajoie-Mazenc,et al.  Analysis of torque ripple due to phase commutation in brushless DC machines , 1990, Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting.

[4]  Salih Baris Ozturk,et al.  Direct Torque and Indirect Flux Control of Brushless DC Motor , 2011, IEEE/ASME Transactions on Mechatronics.

[5]  H. Toliyat,et al.  Sensorless direct torque and indirect flux control of brushless DC motor with non-sinusoidal back-EMF , 2008, 2008 34th Annual Conference of IEEE Industrial Electronics.

[6]  Giuseppe Buja,et al.  Development of Electric Propulsion Systems for Light Electric Vehicles , 2011, IEEE Transactions on Industrial Informatics.

[7]  Yong Liu,et al.  Commutation-Torque-Ripple Minimization in Direct-Torque-Controlled PM Brushless DC Drives , 2006, IEEE Transactions on Industry Applications.