Abstract
In order to accurately evaluate the performance of a traction machine/drive system, it is necessary to have an accurate excitation source which considers current harmonics. In this paper, four machine/drive systems with different excitation sources have been modeled, simulated, and studied to evaluate the effects on permanent magnet synchronous machines (PMSMs) from different perspectives. In Model I, the excitation is an ideal sinusoidal current source with no harmonics. Model II is excited by an ideal sinusoidal voltage source regardless of the pulse width modification’s (PWM’s) influence. Model III takes into account the influence of current harmonics under space vector pulse width modulation (SVPWM) control. Model IV is based on the equivalent circuit extraction (ECE) model (a look-up table motor model). We simulate these four models and study the characteristics of the excitation sources, based on the observations of current harmonics, torque, electromagnetic force, computation time, and efficiency. Experiments are also conducted to show that Model III allows the most precise study of the considered system. Model IV is a good substitution, providing similar results with a shorter running time.
Highlights
With the advantages of high efficiency and high torque density, permanent-magnet synchronous motor drive systems are widely adopted in many fields, such as in household electric appliances, industrial robots, electric transportation, etc. [1,2,3]
Model III takes into account the influence of current harmonics under space vector pulse width modulation (SVPWM) control, providing more details of the excitation sources
Model IV is constructed by retaining the co-simulation configuration as in Model III, but only replacing the permanent magnet synchronous machines (PMSMs) FEA model with the equivalent circuit extraction (ECE) model, so the parameter settings in the co-simulation configuration remain unchanged
Summary
With the advantages of high efficiency and high torque density, permanent-magnet synchronous motor drive systems are widely adopted in many fields, such as in household electric appliances, industrial robots, electric transportation, etc. [1,2,3]. Current harmonics of the excitation sources must be included to increase the accuracy of the model of the motor drive system. The above two methods both include current harmonics in the excitation sources, which highly increases the accuracy of the excitation model It is very interesting and necessary to thoroughly study their excitation characteristics in a motor drive system model. The results from this research provide references for model selection based on different applications, and provide strong evidence and an innovative perspective for further research of NVH characteristics of the motor drive system, which directly reflect the comfort levels and battery performances of EVs. The remainder of this paper is organized as follows.
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