We propose a method to estimate all electrical parameters of five-phase induction motors based on a new concept of instantaneous impedance. Only stator voltages and currents acquired during no-load startup tests are required to determine the parameters of the fundamental and third-harmonic equivalent circuits. Additional quantities, such as rotor speed and electromagnetic torque, are also estimated from measurements. Unlike similar procedures, the parameters of the third-harmonic circuit are estimated separately from the parameters of the fundamental circuit, thus making the estimation more accurate. To experimentally validate the method, we tested a 4.5-kW and a 5.5-kW prototype using sinusoidal as well as trapezoidal voltages generated by a static converter. One of the main advantages of the proposed procedure is the possibility of using data acquired also with a static converter. Besides, to validate the method as well as to assess the accuracy of the estimated parameters, we first simulated the machine behavior using the estimated parameters and the measured stator voltages as input and subsequently compared the simulated currents with those acquired during no-load startup and load tests. Furthermore, we implemented a closed-loop Rotor Field Oriented Control (RFOC) scheme using both calculated and estimated parameters and then compared the controller performance with both sets of parameters. The practical results demonstrate not only that the method provides accurate estimates for all parameters but also that the use of the estimated parameters can improve the performance of the controller.

我们提出了一种基于瞬时阻抗的新概念来估计五相感应电动机的所有电参数的方法。仅需要在空载启动测试期间获取的定子电压和电流即可确定基本和三次谐波等效电路的参数。还可以通过测量来估算其他量，例如转子速度和电磁转矩。与类似的过程不同，三次谐波电路的参数是与基本电路的参数分开估算的，从而使估算更加准确。为了通过实验验证该方法，我们使用由静态转换器产生的正弦和梯形电压测试了4.5 kW和5.5 kW的原型。所提出的过程的主要优点之一是可以使用通过静态转换器获取的数据。此外，为了验证该方法并评估估计参数的准确性，我们首先使用估计参数和测得的定子电压作为输入来模拟机器行为，然后将模拟电流与在空载启动时获得的电流进行比较负载测试。此外，我们使用计算参数和估计参数实施了闭环转子磁场定向控制（RFOC）方案，然后将控制器性能与两组参数进行了比较。实际结果表明，该方法不仅可以为所有参数提供准确的估计值，而且还可以使用估计的参数来提高控制器的性能。