This equipment adopts a thyristor excitation DC generator-motor set with a field weakening regulation device working in step with loading.

该设备采用可控硅励磁直流发电机——直流电动机系统，具有取决于负载的弱磁调节装置。因此操作起来极为方便。

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The torque characteristics, power characteristic and field weakening characteristic of the SPM motor have been analyzed in details by the phasor method.

采用永磁同步电机d、q坐标系下的相量分析法，研究不同弱磁率对电机功率特性、转矩特性和弱磁特性的影响。

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In the field weakening region, the torque capacity decreases with the increasing frequency, torque output capacity depends largely on the field-weakening control strategy.

在弱磁区，转矩能力随着频率的增加而减小，电机转矩输出能力很大程度上取决于弱磁控制策略。

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The Earth's core is important because it generates the planet's electromagnetic field - which seems to be weakening.

BBC: Planet Earth

Moreover, there is (controversial) evidence of a long-term weakening trend in the magnetic field strength of sunspots.

FORBES: To The Horror Of Global Warming Alarmists, Global Cooling Is Here