The reluctance motor operates synchronously at a speed which is determined by the supply frequency and the number of poles for which the stator is wound.

磁阻电动机以某一速率同步动转，该速率是由电源频率和定子绕制的极数决定的。

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The reluctance motor operates synchronously at a speed which is determined by the supply frequency and the number of poles for which the stator is wound.

磁阻电动机以某一速率同步动转，该速率是由电源频率和定子绕制的级数决定的。

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Approaching the filter circuit from the frequency perspective will force you to consider issues such as the filter bandwidth design and order (number of poles).

从频率的角度设计滤波器电路，必须考虑诸如滤波器带宽设计和阶数(极点的数量)之类的问题。

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The company said a number of electricity poles had been brought down, some by falling trees.

BBC: Mold on Saturday

Soon a number of young Poles set up their own operations, travelling around Europe and to the US in order to learn from those who had recently taken the same steps.

BBC: Krakow brews a beer scene of its own

The arrival of so many Poles in the UK has led to a number of initiatives such as Wales' first Polish support centre, which opened in Llanelli last year.

BBC: NEWS | UK | Wales | Mid Wales | Polish minister could boost flock