The results show that the diffuser has such advantages as larger inductionratio, low resistance and noise, relatively even air supply, no condensation, simple in structure and low in costs.
测试结果表明，该风口的诱导比大，阻力小，噪声低，送风比较均匀，风口没有结露现象，结构简单，造价低。
2
A new direct torque control (DTC) strategy based on duty ratio control technique of induction motor drives is presented.
文中提出了一种新的基于占空比控制技术的异步电机直接转矩控制方案。
3
Using space vector pulse-width modulation (SVPWM) signal transformation method, speed regulation of induction motor is implemented by controlling the duty ratio of every converter switch.