变频驱动器（VFD）广泛应用于驱动风扇、泵和压缩机的感应电机。在部分负载下，VFD不仅可以调整频率以降低电机转速和机械输出功率（负载），还可以调整负载电压以降低电机的电输入功率。传统上，VFD制造商建议控制电压，使其与风扇和泵上可变扭矩电机负载的频率平方成比例，与压缩机上恒定扭矩电机负载的频率成比例。本文的目的是用电机等效电路法研究VFD的能效电压频率比。首先，针对不同的应用推导了电机负载和速度的相关性。 然后，针对给定的VFD频率优化VFD电压，以最大限度地提高电机效率。最后，在最佳电压和不同预设电压下对电机效率进行了仿真和比较。仿真结果表明，当电压频率与功率之比为1.5时，电机效率几乎接近于变转矩电机负载的最佳效率，当电压频率与功率之比为0.5时，电机效率基本上接近于恒转矩电机负载的最佳效率，效率比传统比率提高了3%。引用:2016年年度会议，密苏里州圣路易斯，2016年交易，第122卷。 2

Variable-frequency drives (VFDs) are widely applied oninduction motors that drive fans, pumps, and compressors.Under partial loads, VFDs not only adjust frequency to reducemotor speed and mechanical output power (load) but alsoadjust voltage to reduce motor electrical input power. Traditionally,VFD manufacturers recommend controlling the voltageso that it is proportional to the square of the frequency forvariable torque motor loads on fans and pumps and proportionalto the frequency for constant torque motor loads oncompressors. The purpose of this paper is to investigateenergy-efficient voltage frequency ratios of VFDs using themotor equivalent circuit method. First, the motor load andspeed correlation are derived for different applications. Then,VFD voltage is optimized for a given VFD frequency to maximize motor efficiency.Finally, the motor efficiency is simulatedand compared under the optimal voltage and different presetvoltages. The simulation results show that the motor efficiencywith the ratio of voltage to frequency to the power of 1.5 ismostly close to the optimal efficiency for variable torque motorloads, and the motor efficiency with the ratio of voltage tofrequency to the power of 0.5 is mostly close to the optimal efficiencyfor constant torque motor loads with efficiency improvementby up to 3% over traditional ratios.