Abstract
The dynamic characteristics such as speed and torque as well as voltages and currents of pwm brushless DC motor inverter are analyzed with a MATLAB model. The contribution of external load torque and friction torque is monitored. The switching function technique is adopted for the current control of the embedded three phase inverter that drives the brushless DC motor. In switching functions the power conversions circuits can be modeled according to their functions rather than circuit topologies. Therefore, it can achieve simplification of the overall power conversion functions. The trapezoidal type (back emf) is used in the model as it has lower switching loss compared with sinusoidal type (back emf). Results show reliable time analysis for speed, torque, phase and line voltages and currents and the effect of current commutation is clearly observed.
Reference10 articles.
1. - J. R. Hendershot and T. J. E. Miller, Design of Brushless Permanent-Magnet Motor, Oxford: Oxford Science, 1994.
2. - J. P. Johnson and M. Ehsani, “Review of sensorless methods for brushless DC,” Proc. of the IEEE Industry Application Society Annual Meeting IAS’99, pp. 143–150, 1999.
3. - S. K. Safi, P. P. Acarnley, and A. G. Jack, “Analysis and simulation of the high-speed torque performance of brushless DC motor drives,” Proc. of the IEE, vol. 142, 1995.
4. - B. K. Lee and M. Ehsani, “A simplified functional model for 3-phase voltage-source inverter using switching function concept,” IEEE Trans. on Industrial Electronics, vol. 48, no. 2, pp. 309–321, April 2001.
5. - B.K. Lee and M. Ehsani, Advanced Simulation Model for Brushless DC Motor Drives, Electric Power Components and Systems *$, 841–868, 2003.