异步电动机最大效率转矩比控制方法

Maximum Efficiency per Torque Control of Induction Motor

针对传统异步电动机直接转矩及直接磁链控制中未考虑电动机效率的问题,提出异步电动机最大效率转矩比控制方法。此方法将定子磁链作为控制对象,并联合电动机损耗模型给出磁链在线计算方法。在线磁链计算是根据电动机的实时工况给出最佳磁链参考值,而参考值的给定依据是当前转矩下的效率最大,所以所提方法可应用于直接转矩或直接磁链控制系统中。而电动机损耗模型对参数具有依赖性,同时在线计算不利于工业应用,因此通过实验方法建立了一组特定温度下的多速域不同负载下的离线表。实验结果表明,所提出的算法具有可行性,尤其在轻载工况下效率提升明显。

Aiming at the problem that the direct torque and direct flux linkage control of traditional induction motor do not consider the efficiency of motor, a maximum efficiency ratio control method of asynchronous motor is proposed. This method uses the stator flux linkage as the control object, and gives the flux linkage online calculation method by combining the motor loss model. The online flux linkage calculation is based on the real-time operating conditions of the motor to give the optimal flux linkage reference. The reference is based on the maximum efficiency under current torque, so the proposed method can be applied to direct torque or direct flux control system. Because the motor loss model is dependent on the parameters, and the online calculation is not suitable for industrial applications, a set of off-line tables under different loads at different temperatures are established by the experimental method. The experimental results show that the proposed algorithm is feasible, especially at light load conditions.