无级调速无刷直流风机盘管
brushless DC motor fan coil unit
无极速度图
poleless velocity diagram
无极速度图法
non-polar velocity figure method
non-polar velocity-diagram method
无极速度图绘制
non-polar velocity drawing
变极调速
pole change speed regulating
pole-changing speed governing
pole changing speed control
Pole-changing adjustable-speed
change-pole speed-adjusting
speed regulation by pole changing
Pole changing and adjustable speed
pole-conversion speed adjustment
pole-changing control
Two-speed pole-changing motor
adjust speed by change magnetic pole
speed modula tion by changing poles
变极调速电机
variable pole adjustable speed motor
最高转速调速装置
maximum speed governor gear