动态边端效应下直线感应电机最小损耗控制

Loss Minimization Control Strategy Based on Dynamic End Effect Loss Model of Linear Induction Motor

针对当前直线电机应用中提升效率的需求和其效率优化策略中损耗模型准确性和复杂度难以取舍的问题,对直线感应电机提出了一种考虑动态边端效应和漏感影响,同时复杂度适中的新型最小损耗策略。通过计算最优磁链,重新平衡d-q轴电流。文章首先基于改进的双三相直线感应电机数学模型推导出一种新型稳态损耗模型,并由此模型设计出完整的最小损耗控制策略。对于3 kW短初级六相直线感应电机,仿真验证此策略较传统策略,在0.2p.u.轻载、5m/s时减少约250W(48%)损耗,同时推力波动显著减小。最后全面对比了各种工况下此处新策略的损耗降低效果。

To better balance the accuracy and complexity of the loss model in loss minimization strategy of linear motor.A simple and accurate loss-model-based LMC strategy was presented for a six-phase linear induction motor(LIM)that considered the effects of leakage inductance and dynamic end effect.Firstly,an improved steady-state loss-model based on the mathematical model of six-phase linear motor considering dynamic end effect was proposed,according to which the complete LMC strategy was designed.This strategy achieved the minimum loss by calculating the optimal flux and rebalancing the d-q axis current.For simulation object,a 3 kW short primary bilateral six-phase linear induction motor,compared with the traditional FOC strategy,approximate 250 W(48%)loss reduction can achieve and thrust ripple are significantly reduced under the light load condition of 0.2 p.u.,5 m/s.Moreover,the significant efficiency improvement under various operating conditions were verified.