The power supply of high speed electrical machine is high-frequencyvoltage and the loss of electrical machine density is great and heat dissipation is difficult.
高速电机的体积小、功率密度大和效率高，正在成为电机领域的研究热点之一。
2
The method employed high-frequencyvoltage-signal injection to make motor form a high-frequency current-vector, of which the negative component current contained rotor space-position information.
该方法采用高频电压载波注入方式形成高频电流矢量，其负序分量包含了转子空间位置信息。
3
To cook food, a microwave oven converts voltage into high-frequency electromagnetic microwaves.