High efficiency of transformer is an important task of electric distribution equipment energy-saving.
变压器高效率化是变配电设备节能的重要课题。
Electric bicycle with energy feed back by the use of DSP and permanent magnet synchronous motor (PMSM) has good foreground because of its energy-saving and high energy efficiency.
DSP控制同步电机并能实现能量回馈的电动助力车，由于其可以实现可逆能量的控制，具有节能高效的特点，有很好的发展前景。
Electric supply of filament adopts constant voltage device, which has high voltage stabilizing accuracy, long life and distinct energy-saving efficiency.
灯丝供电采用恒压器，稳压精度高，寿命长，节能显著。E。
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