You can't play trumpet or sax inside the giant magnet that is an MRI machine.
在MRI机器的大型磁场中无法吹奏小号或萨克斯管。
The flux due to permanent magnet is the main part of gap flux, the rest flux is produced by the winding coil, which play a part of regulation.
永磁体产生的磁场是气隙磁场的主要部分，另一部分是由辅助励磁绕组的电流来激励产生，起调节磁场的作用。
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