| 1. | 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。 |
| 2. | In hybrid stepper motor , the back emf of stator winding is function of rotor position , continuous rotor position is obtained from the function
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。 |
| 3. | This system is designed to measure motor ’ s three important parameters including stator coil inductance , stalling torque and back emf . all of these test results are used as basis for product detect
设计这套测试系统用来检测电机定子绕组电感、堵转扭矩及反电动势等三个重要电机参数,把其结果作为检验产品质量的依据。 |
| 4. | In this paper , the influence of rotor - skewing on the machine performance , such as the unbalanced radial force , cogging torque and back emf , is analyzed , with two different prototypes being comparatively studied
分析了转子斜极对其不对称径向力、齿槽定位转矩和反电势等性能的影响，并用两种不同结构的电机进行对比研究。 |
| 5. | At the end of this paper , i put forward a new back emf sensing method which does n ' t require a virtual neutral point to realize the sensing for rotor flux position . it improves the performance of bldc motor at low speed and at high speed and broaden its range of timing
最后针对系统的不足，提出了另外一种不需要引出虚拟中点的反电势检测方法来实现对转子位置的检测，它能够提高电机低速和高速运行时的性能，拓宽直流无刷电机的调速范围。 |
| 6. | It elaborates on the 3 - step start technique . i adopt the method which permits the bldc motor to automatically search the best time to change its operation stage from a separately controlled synchronous one to a self controlled one using the back emf as the commutation signal . this method prevents the stepping out and stopping problems in the changing procedure of the motor
阐述了电机的三段式起动方法，在直流无刷电机由起动阶段外同步运行切换到反电势换向自同步运行的过程中采用了自寻最优点切换的方法，保证了电机在切换过程中不会发生失步和停转现象。 |
| 7. | The chip jk3ce that is one of micro - controllers in motorola 68hc08 family is used as control unit in this system . the zero crossing point of the back emf can be obtained by comparing the terminal voltage with the virtual neutral point , then using the software of the system can figure out the commutation period . the electronic commutation replaces the mechanical commutation in this way
本系统采用的控制芯片为motorola系列单片机中的jk3ce ，反电势过零点可以通过比较电机端电压和虚拟中点电压来得到，将过零点信号送往单片机捕捉端口后由系统软件来确定换相时刻，这样就可以由电子换向装置替代机械换相装置，有利于提高系统运行的可靠性，并降低了系统维护的费用。 |
