The exact rotor position is required while a brushless DC motor (BLDCM) is under commutation and control. Howere, posi2 tion sensors have some fatal defects.

无刷直流电机的换相和控制都需要准确的转子位置信息，然而安装转子位置传感器有其难以克服的缺点。

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The exact rotor position is required while a permanent magnet brushless servo motor (PMBSM) is under commutation and control. Howere, position sensors have some fatal defects.

永磁无刷伺服电机的换相和控制都需要准确的转子位置信息，然而位置传感器有其难以克服的缺点。

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Now, under the terms of Obama's commutation announced by the White House Tuesday, Manning is set to be freed on May 17 of this year, rather than in 2045.

现在，根据白宫周二宣布的奥巴马的减刑令，曼宁将于今年5月17日，而不是2045年获释。

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Moving on to small private pensions, you may be able to take relatively small pension savings wholly in cash under an arrangement known as "trivial commutation".

BBC: Pension planning: When to take a cash lump sum