摘要
针对无刷直流电动机弱磁高速运行时损耗大的问题,研究最小损耗电流控制。通过分析基于瞬时无功功率的无刷直流电动机弱磁控制理论,计算d-q轴电枢反应电感,提出一种考虑铁损的电机Γ型近似等效电路,结合状态方程,推导出满足电磁损耗最小的励磁电流表达式。仿真和实验结果表明,在整个弱磁运行区间内,最小损耗电流控制能够降低电机电磁损耗,提高电机运行效率,扩大电机恒功率调速范围。
A loss minimization current control was presented for rise in loss of brushless DC motors（BLDCMs） under high-speed and flux-weakening operation.Through analyzing flux-weakening control theory of BLDCMs based on instantaneous reactive power and computing d-axis and q-axis armature reaction inductances,a Γ-styled equivalent approximate circuit of motor was proposed in this paper.Combining with state equations,magnetizing current expressions meeting the minimum of electromagnetic loss were derived.Simulation and experimental results show that minimum current control decreases the total electromagnetic losses,enhances operating efficiency and enlarges the constant-power speed regulation range of BLDCMs in the entire flux-weakening operation region.
出处
《微特电机》
北大核心
2010年第9期39-42,共4页
Small & Special Electrical Machines
关键词
无刷直流电动机
效率优化
电磁损耗
弱磁
brushless DC motor
efficiency optimization
electromagnetic loss
flux-weakening
