直流无刷电机PWM仿真分析报告.docVIP

直流无刷电机的PWM仿真分析 MotorSolve BLDC模块的一个突出特点是动态仿真能力，包括使用理想电源或PWM驱动电路的分析。本例中，展示了PWM驱动电路下对直流无刷电机的仿真分析。 Simulating Pulse Width Modulation with a Brushless DC Motor MotorSolve BLDC contains an extensive list of post-processing options that allow the user to analyze models using finite element, analytical and hybrid approaches. One of MotorSolve BLDCs salient features is its dynamical simulation capabilities. These include simulation options using an ideal driver (transient analysis) and that using PWM drive circuits. In this gallery, some examples of simulations using the PWM drive are presented. The figure shown here is an example of a wye-connected 3 phase drive circuit used in such simulations. PWM capabilities of MotorSolve BLDC include delta connected circuits and sinusoidal and six-step drive types. Also, switching losses are taken into account in the simulations. METHODS and RESULTS 4-POLE 12-SLOT MOTOR with PHASE A WINDING Consider a 4 pole 12 slot motor with phase A winding, as shown on the figure to the left. The examples presented below are for this model. LINE CURRENTS for the THREE PHASES PWM simulations are performed easily in MotorSolve BLDC. The user simply inputs the operating parameters, elects to perform a PWM Analysis, selects the solution entities of interest and MotorSolve BLDC automatically generates the results with-a-click. Consider the following settings applied to the model shown above: PWM 3-phase bridge simulation, six-step drive type, wye connected windings operating at 1000 rpm. The line currents for the three phases with these settings are shown on the figure to the left. The spikes seen in the various phases represent current switchings. INSTANTANEOUS BACK EMF on PHASE A at VARIOUS ROTOR SPEEDS A number of interesting results are available to the designer from the PWM simulations including torque, back emf, line and winding voltages, power input and output, flux linkage, etc. The user may generate instantaneous, time-averaged as well as harmo