针对四开关逆变器没有零电压控制矢量的特点，提出了回扫延时的概念。
In this method eight voltage controlling vectors are summarized, four vectors of which are selected to control a motor.
机械式电源开关不具备停电自锁和断电回零等功能，在一些特殊的安全要求较高的场所，使用这种开关也存在着一定的安全隐患。
As the mechanical switch has no function of automatic locking and returning to zero in power failure, there exists some potential danger when used in places where safety is called for.
机械式电源开关不具备停电自锁和断电回零等功能，在一些特殊的安全要求较高的场所，使用这种开关也存在着一定的安全隐患。
As the mechanical switch has no function of automatic locking and returning to zero in power failure, there exists some potential danger when used in places where safety is called for.
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