1.导语
这些年，跟着变频器本身功用的不断完善，交流调速技术有了长足的跋涉。怎么在不一样使用条件下充分开发变频器本身功用、有用的降低设备的改形本钱已成为一个主要疑问。与通常的控制方法比照，使用变频器直流制动功用结束交流拖动系统精确泊车的计划计划省去了价值宝贵的变频器专用制动单元／制动电阻，有用降低了设备改形本钱，工作安稳可靠、控制精度高。
2.VVVF能耗制动的理论分析
通用变频器供给的制动方法主要有：能耗制动、再生制动、整流回馈等。在转动惯量较大的工况条件下，变频器厂家所主张选用的通常方法是外接制动电阻和制动单元的再生制动方法，某些情况下可以协作选用直流制动。这一计划思路底子为大多数目内用户所接受，并在实践使用中获得了较好的作用。但该计划需其他收购变频器厂家供给的专用制动单元／制动电阻，无形中增大了改形本钱。
所谓“直流制动”，通常指当变频器的输出频率靠近为零，电机的转速降低到必定数值时，变频器改向异步电动机定子绕组中通入直流，构成间断磁场，此时电动机处于能耗制动情况，转动着的转子切开该间断磁场而发作制动转矩，使电动机活络间断。在电动机制动进程中，因为变频器输出频率逐渐降低，则定子绕组内的同步磁场转速低于转子转速，电动机处于再生制动进程，此时旋转系统存储的动能转换成电能热损耗的方法消耗于异步电动机的转子回路中，为避免电动机减速进程中所构成的再生发电制动以及直流制动进程中的能量回馈，构成变频器和电机的损坏，需串入专用制动单元／制动电阻。

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