Different starting methods of permanent magnet brushless DC motor are compared, a starting method of self-search best commutation point of permanent magnet brushless DC motor is put forward.
比较了永磁无刷直流电机的各种起动方法，分析它们的优缺点，提出了适合光伏水泵系统的自寻最佳切换点的永磁无刷直流电机起动方法；
To set up a sync point coincide with a natural commutation point in OTC products, and will be able to improve reliability and stability of the phase shifting trigger and output of the power source.
OTC有关产品把同步点设计在自然换相点上，使同步移相触发和电源输出更趋稳定可靠。
Taking the system of commutation as the breakthrough point, the article analyzes deeply the existed questions in reality so as to perfect our country's criminal activity legal regime.
以减刑制度为切入点，对减刑制度在实践中存在的问题进行深层分析，有助于完善我国的刑事法律制度。
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