【作者】 袁晓玲；

【导师】 沈祖诒； 王宏华；

【作者基本信息】 河海大学 ， 电力系统及其自动化， 2004， 博士

【摘要】 本论文的研究工作是结合国家自然科学基金资助项目“开关磁阻电动机非线性振动理论及控制策略研究(59977005)”进行的。 论文提出了开关磁阻电动机电感对转子位置角的非线性模型，基于此模型从时域和频域研究了开关磁阻电动机在角度位置控制和电压PWM控制方式下，控制参数对其振动特性的影响。时域研究表明，角度位置控制方式下，开通角对电流和电磁力的影响大于关断角的作用；电压PWM控制方式下，斩波频率和转速的增大、占空比的减小使电流有效值和平均电磁力减小，降低了电机的振动和噪声；频域研究表明，角度位置控制方式和电压PWM控制方式下，控制参数的微调可以引起电流和电磁力频谱的变化，因此可以方便地调节控制参数以避开定子固有频率，避免谐振引起的振动和噪声。 论文对两步换相法应用于电压PWM控制方式的电压斩波期间进行了研究，结果表明采用此方法可以有效地减小电流和电磁力的波动。开关磁阻电动机的运行控制参数多，论文分析研究了斩波频率和转速的协调控制，结果表明，斩波频率和转速的比值确定，其电流和电磁力相对值是相等的，实际应用中可首先确定电流和电磁力波动情况最小时对应的斩波频率与转速的比值，调速时相应地调整斩波频率，以达到降低振动和噪声的目的。 论文提出了开关磁阻电动机电感对电流和转子位置角的非线性模型，基于此模型推导了非线性电流和电磁力的解析计算公式；对非线性电流解析解进行了简化计算，根据误差分析，指出了简化解的适用条件。 论文建立了开关磁阻电动机调速系统的非线性动态仿真模型，基于此模型研究了基于转矩观测器法的转矩脉动抑制，对控制系统中的转速环采用自适应模糊PID控制器进行控制，仿真结果表明转矩脉动抑制效果良好。更多还原

【Abstract】 This dissertation is devoted to " Research on theory and control strategy of nonlinear vibration in switched reluctance motor ", which is supported by the National Natural Science Fund(59977005).A nonlinear function of inductance against rotor position is constructed. Based on the model, the effect of controlled parameters of SRM in APC and voltage-PWM on vibration is studied in time domain and frequency domain respectively. Research in time domain indicates that the effect of turn-on angular on phase current , shearing force and radial force is more significant than that of turn-off angular in APC and that if chopping frequency and speed is increased and duty is reduced in voltage-PWM, then phase current, shearing force and radial force are reduced, resulting in the reduction of vibration and acoustic noise. Research in frequency domain indicates that in APC and voltage-PWM, little modulation of controlled parameter can modify the spectrum of phase current, shearing force and radial force. So the spectrum can be modified to avoid the harmonic with inherent frequency of stator conveniently.Two-steps commutation in course of voltage-PWM is studied in the dissertation. The conclusion is that vibration of phase current, shearing force and radial force are reduced by use the two-steps commutation. Assorted control of controlled parameter are researched. The conclusion is that if quotient of chopping frequency and speed is confirmed, the shape of phase current, shearing force and radial force are identical. So in practical use, chopping frequency can be modified according with the speed.Nonlinear model of inductance against rotor position and phase current is constructed. Based on the model, formulae of nonlinear phase current, shearing force and radial force are calculated. Simplify the nonlinear phase current formula is done and the condition of using the simplified formula is studied according to the error analyses.Dynamic nonlinear simulation model of switched reluctance drives is constructed. Based on the model, torque ripple minimization based on torque observation is studied. Adaptive fuzzy PID is adopted in the closed speed loop in the model. Theconclusion is that the effect of torque ripple minimization is significant.更多还原