This paper proposes an extended-flux model with core-loss resistance of SynRMs （synchronous reluctance motors） and precise torque estimation without core-loss measurement and position encoder. The proposed torque es...This paper proposes an extended-flux model with core-loss resistance of SynRMs （synchronous reluctance motors） and precise torque estimation without core-loss measurement and position encoder. The proposed torque estimation is useful for precise MTPA （maximum torque per ampere） control of position sensorless controlled SynRMs, which is achieved with the assistance of active and reactive powers.展开更多
For permanent magnet synchronous machines(PMSMs),accurate machine model is critical for high performance maximum torque per ampere(MTPA)control.However,as motor speed increases,the nonlinearity such as core loss effec...For permanent magnet synchronous machines(PMSMs),accurate machine model is critical for high performance maximum torque per ampere(MTPA)control.However,as motor speed increases,the nonlinearity such as core loss effect will affect the accuracy of machine model and thus the performance of online MTPA control.This paper firstly investigates the performance of the model based MTPA control under different motor speeds through modeling,simulation and experiments,which indicates that the accuracy of MTPA control is greatly reduced especially under high-speeds due to machine nonlinearity.Hence,this paper proposes an efficient nonlinearity compensation model based on polynomial fitting to model and compensate the MTPA error as motor speed increases.Considering both core loss and magnetic saturation effects,the compensation model is a nonlinear polynomial of speed and stator current.To obtain the fitting data,a derivative modeling method is proposed to compute the actual and detected MTPA angles under different speeds,in which the derivative model of torque to current ratio is fitted and the MTPA angle is obtained by setting the derivative model to zero.The proposed compensation model is both computation effective and easy to use for MTPA control,as it computes the compensation term that can be directly combined to other model-based methods.The proposed model is evaluated with experiments and comparisons on a test motor to show the performance improvement.展开更多
永磁同步电机具有较高的效率和功率密度,在电动汽车驱动系统中广泛应用。电机的d、q轴电感是设计控制系统的重要参数,但重载情况下受磁饱和及交叉饱和影响严重。传统控制技术忽略磁饱和效应,导致转矩控制的精确性不足。采用有限元法分...永磁同步电机具有较高的效率和功率密度,在电动汽车驱动系统中广泛应用。电机的d、q轴电感是设计控制系统的重要参数,但重载情况下受磁饱和及交叉饱和影响严重。传统控制技术忽略磁饱和效应,导致转矩控制的精确性不足。采用有限元法分析电机负载时的磁饱和情况,计算考虑磁饱和及交叉饱和的d、q轴电感参数。以此为基础,拟合d、q轴电感和电流关系。设计计及磁饱和的最大转矩电流比MTPA(maximum torque per ampere)控制,使d、q轴参考电流计算中使用的电感随电机电流变化。通过对比,证明计及磁饱和的MTPA控制能够实现输出转矩的精确控制,提高永磁同步电机的动态响应性能。展开更多
针对采用矢量控制方法的内置式永磁同步电机(IPMSM)存在解耦复杂、附加优化目标难以融入系统控制等问题,提出了一种基于最大转矩电流比(MTPA)的IPMSM转矩预测控制方法。在推导MTPA控制原理的基础上,分析了转矩预测的控制机理及性能指标...针对采用矢量控制方法的内置式永磁同步电机(IPMSM)存在解耦复杂、附加优化目标难以融入系统控制等问题,提出了一种基于最大转矩电流比(MTPA)的IPMSM转矩预测控制方法。在推导MTPA控制原理的基础上,分析了转矩预测的控制机理及性能指标函数。22 k W试验样机的仿真与试验结果表明,系统稳态及全局加减负载条件下调速性能良好、转矩动态响应迅速。该方法在重载条件下定子电流利用率显著提高,满足电动车辆驱动控制系统的性能和效率指标要求。展开更多
文摘This paper proposes an extended-flux model with core-loss resistance of SynRMs （synchronous reluctance motors） and precise torque estimation without core-loss measurement and position encoder. The proposed torque estimation is useful for precise MTPA （maximum torque per ampere） control of position sensorless controlled SynRMs, which is achieved with the assistance of active and reactive powers.
基金supported by in part by the National Natural Science Foundation of China(62473387,52105079,62103455)the Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)(SML2023SP241)。
文摘For permanent magnet synchronous machines(PMSMs),accurate machine model is critical for high performance maximum torque per ampere(MTPA)control.However,as motor speed increases,the nonlinearity such as core loss effect will affect the accuracy of machine model and thus the performance of online MTPA control.This paper firstly investigates the performance of the model based MTPA control under different motor speeds through modeling,simulation and experiments,which indicates that the accuracy of MTPA control is greatly reduced especially under high-speeds due to machine nonlinearity.Hence,this paper proposes an efficient nonlinearity compensation model based on polynomial fitting to model and compensate the MTPA error as motor speed increases.Considering both core loss and magnetic saturation effects,the compensation model is a nonlinear polynomial of speed and stator current.To obtain the fitting data,a derivative modeling method is proposed to compute the actual and detected MTPA angles under different speeds,in which the derivative model of torque to current ratio is fitted and the MTPA angle is obtained by setting the derivative model to zero.The proposed compensation model is both computation effective and easy to use for MTPA control,as it computes the compensation term that can be directly combined to other model-based methods.The proposed model is evaluated with experiments and comparisons on a test motor to show the performance improvement.
文摘永磁同步电机具有较高的效率和功率密度,在电动汽车驱动系统中广泛应用。电机的d、q轴电感是设计控制系统的重要参数,但重载情况下受磁饱和及交叉饱和影响严重。传统控制技术忽略磁饱和效应,导致转矩控制的精确性不足。采用有限元法分析电机负载时的磁饱和情况,计算考虑磁饱和及交叉饱和的d、q轴电感参数。以此为基础,拟合d、q轴电感和电流关系。设计计及磁饱和的最大转矩电流比MTPA(maximum torque per ampere)控制,使d、q轴参考电流计算中使用的电感随电机电流变化。通过对比,证明计及磁饱和的MTPA控制能够实现输出转矩的精确控制,提高永磁同步电机的动态响应性能。
文摘针对采用矢量控制方法的内置式永磁同步电机(IPMSM)存在解耦复杂、附加优化目标难以融入系统控制等问题,提出了一种基于最大转矩电流比(MTPA)的IPMSM转矩预测控制方法。在推导MTPA控制原理的基础上,分析了转矩预测的控制机理及性能指标函数。22 k W试验样机的仿真与试验结果表明,系统稳态及全局加减负载条件下调速性能良好、转矩动态响应迅速。该方法在重载条件下定子电流利用率显著提高,满足电动车辆驱动控制系统的性能和效率指标要求。
