This paper presents a novel sensorless startup strategy for a 315-kW high-speed magnetic suspension brushless dc (BLDC) motor with small inductance and nonideal back electromotive force (EMF). Two key strategies on the sensorless startup strategy of the BLDC motor are presented: First, small current startup strategy for the high-speed BLDC motor with small inductance; and second, self-adaption control strategy to compensate the commutation error for the BLDC motor with nonideal back EMF in the startup stage. A hybrid pulsewidth modulation strategy based on the load torque is proposed to limit the startup current. An optimal motor startup curve based on the system parameters is presented, and a self-adaption control strategy is proposed to solve the synchronous switching problem. The effectiveness and feasibility of the proposed method is verified by a series of experiments on the 315 kW, 20 000 r/min magnetic suspension blower platform.

中文翻译：

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具有小电感和非理想反电动势的 315 kW 高速无刷直流电机的无传感器启动策略


本文提出了一种新型无传感器启动策略，适用于具有小电感和非理想反电动势 (EMF) 的 315 kW 高速磁悬浮无刷直流 (BLDC) 电机。提出了BLDC电机无传感器启动策略的两个关键策略：一是小电感高速BLDC电机的小电流启动策略；其次，采用自适应控制策略来补偿非理想反电动势的 BLDC 电机在启动阶段的换相误差。提出了一种基于负载扭矩的混合脉宽调制策略来限制启动电流。提出了基于系统参数的最优电机启动曲线，并提出了自适应控制策略来解决同步切换问题。通过在315 kW、20 000 r/min磁悬浮鼓风机平台上的一系列实验验证了该方法的有效性和可行性。