mechanical commutation meaning in English
机械换向
Examples
- Mechanical commutation ( graphite or precious metal brushes ) , highest efficiency , low inductance , low electromagnetic interference , multiple combination possibilities with gears , feedback devices and control electronics
机械换向器（石墨和金属电刷） ，高效率，小电感，电磁干扰小，能与多种齿轮箱，反馈设备和控制电子元件配合使用。 - The permanent magnet brushless dc motor is a dc motor using electronic commutation in place of mechanical commutation in fact , so it has excellent characteristics of dc motors , for example good start and timing performance . it simplifies the motor ' s structure and overcomes the friction disadvantages of ordinary dc motor because it does n ' t use mechanical commutation . it is extensively used in aviations , robots , digital machine tool and so on
永磁无刷直流电动机实际上是以电子换向代替机械换向的直流电动机，因而保持了直流电动机的优良特性，具有较好的起动和调速性能，又因它无需机械换向器使电机的结构简单，可以从根本上克服一般有刷直流电动机易于产生换向火花的弊病，在航天、机器人、数控机床等许多工业领域已得到广泛应用。 - 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。