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- Study on Method of Direct Back EMF Detection for Position Sensorless Brushless DC Motor 无位置传感器无刷直流电机直接反电势检测方法的研究
- direct back EMF detection 直接反电势检测
- The constitute of harmonic back EMF is analysed, the position detection circuit and the microcomputer control system of step motor is designed. 分析了谐波反电势信号的构成，设计了相应的位置信号检测电路及步进电动机的微机控制系统。
- This paper presents the basic principle of sensorless brushless DC motor commutated by using the zero-crossing method of back EMF, and designs the detection circuit. 摘要分析了反电势过零检测法控制无位置传感器无刷直流电机的基本原理，设计了检测电路；
- Detecting back EMF is one of the most important methods for the detection of rotor position in square wave current drive BLDCM sensorless control. 方波电流驱动的BLDC电机无位置传感器控制检测转子位置的最重要方法是反电动势检测法。
- This article emphatically analyzes the basic principle of sensorless brushless DC motor commutated by using the zero-crossing method of back EMF, and designs the zero-crossing detection circuit. 摘要着重分析反电势过零检测法控制无位置传感器无刷直流电动机的基本原理；
- He was directed back home by his superior. 他被家长领回了家。
- The back EMF constant and torque constant are analyzed. The calculating formulas are gived. 分析了电机的反电势常数和力矩常数,并给出了计算公式;
- In hybrid stepper motor, the back EMF of stator winding is function of rotor position, continuous rotor position is obtained from thefunction. 就混合式步进电机而言，定子绕组的反电势是转子位置的函数，从而可以解算出连续的转子位置信息。
- The technique of back EMF induction in BLDC motor is analyzed, the "virtual neutral point" method and the technique of "3-step" start are introduced. 主要分析了反电动势感应方法，并阐述了虚拟中点法和三段式起动技术。
- But, rebinding will introduce blurring and reduce image resolution.Hence, we develop a BPF-type direct back projection algorithm. 本文提出了一种反投影滤波（BPF）形式的直接反投影重建方法，该方法不需要对投影数据重排，直接反投影滤波重建出最终的图像。
- zero crossing detection of back EMF 反电动势过零检测法
- On this base, the closed-loop control method of hybrid step motor using the harmonic back EMF is investigated, and the microcomputer control system of step motor is designed. 在此基础上研究了利用谐波反电势信号实现混合式步进电动机闭环控制的方法，设计了步进电动机的微机控制系统。
- The application of the technology of back EMF induction in BLDC are analyzed by introducing the IC ML4428.The calculation formulas of some important parameters are shown behind. 通过对ML4428的介绍，分析了反电势感应技术在无刷直流电机中的应用，并给出了其中一些重要参数的计算方法
- The zero crossing signal of the true phase back EMF can be directly obtained from the motor terminal voltage by properly choosing the PWM and switch control strategy. 该方法不需要引出电机中性点,通过选择PWM和导通控制策略,就能直接从电机端电压获得反电势过零点信号。
- It is discussed that the performance of servomotor is influenced by winding connect ion, back EMF, resistance, inductance and electrial time constant etc. 讨论了绕组连接方式、反电势以及电阻、电感和电气时间常数等参数对电机性能的影响;
- The occurrence of a change in direction back in the opposite direction. 朝相反方向回复的变化。
- The magnetic network model of hybrid step motor is established according to the air gap rate permeance method, and the expression ofthe harmonic back EMF is deduced. 利用气隙比磁导法建立了混合式步进电动机的磁网络模型，推导出谐波反电势的表达式。
- This new SMO can decrease the high frequency ripple of the back EMF (Induced Electromotive Force), has the advantage of no phase delay, and can simplify the structure of the SMO. 该滑模观测器能够减小估算反电势中的纹波，且不产生信号相位差，并较传统的滑模观测器结构简单。
- The modeling method for the current regulated Brushless DC(BLDC) motor is presented,which is based on the strategy of the piecewise linear curves used to generate the back EMF. 该方法在不影响稳定性的同时,使得控制系统的抗扰能力得到改善。
