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当前大功率的航空发电机开始采用360~800Hz的变频输出方式,在航空变频电源的直接供电下,感应电机的性能受到频率变化最大的影响是在高频时起动转矩太低。针对笼型感应电机,采用解析计算的方法对矩形转子槽尺寸进行优化,在不改变稳态性能的条件下获得最大起动转矩。深槽尺寸的变化将影响集肤效应系数和槽漏感2个方面,二者对起动转矩的作用相反。通过综合2个方面的因素,建立起包含槽型尺寸和频率的动态转子参数模型,并采用该动态转子参数对传统的转矩公式进行调整,进而获得关于转子槽尺寸的起动力矩解析式,同时基于该解析式实现对起动力矩的优化。采用该解析方法对7.5kW感应电机进行深槽转子优化,并对航空变频电源驱动时的起动特性进行了仿真和样机实验,验证了该方法在矩形转子槽优化设计中的有效性。
The current high-power aircraft start using 360 ~ 800Hz frequency conversion output, the direct supply of aviation inverter power supply, the induction motor performance by the greatest impact on the frequency change is too low starting torque at high frequency. For the cage induction motor, the size of the rectangular rotor slot is optimized by analytical calculation and the maximum starting torque is obtained without changing the steady state performance. Changes in the size of the deep groove will affect the skin effect coefficient and the leakage inductance of two aspects, the two of the opposite of the starting torque. By synthesizing the two factors, a dynamic rotor parameter model including the slot size and frequency is established, and the traditional torque formula is adjusted by using the dynamic rotor parameter to obtain the starting torque analytical formula about the rotor slot size, meanwhile, Based on the analytic formula to achieve the optimization of starting torque. The analytical method was used to optimize the deep slot rotor of 7.5kW induction motor. The startup characteristics of the variable frequency power supply were simulated and the prototype experiments were carried out to verify the effectiveness of this method in the optimization design of rectangular rotor slots.