This study proposes a sensorless flux adaption direct torque and flux control (DTFC) for an interior permanent magnet synchronous motor (IPMSM), in which an maximum torque per ampere (MTPA) based on active flux and an adaptive second-order sliding mode observer (SOSMO) are adopted. Flux adaption DTFC is proposed based on the existing active flux concept. Thus, the stator current amplitude can be minimised in both steady state and transient state. Furthermore, to realise the sensorless control of the IPMSM, an adaptive SOSMO is proposed. Compared with constant gains SOSMO, the gains of the adaptive SOSMO can be adjusted adaptively with the motor speed changing. Then, the precision of position estimation is enhanced effectively in a wide speed range. Numerical simulations and experiments with a 60 kW IPMSM are implemented. In addition, the results validate the capability of the proposed sensorless flux adaption DTFC scheme.

中文翻译：

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基于有源基于通量的MTPA和自适应二阶滑模观测器的IPMSM的无传感器通量自适应DTFC

这项研究提出了一种用于室内永磁同步电动机（IPMSM）的无传感器磁通自适应直接转矩和磁通控制（DTFC），其中基于有效磁通和自适应二阶滑模观测器的最大每安培转矩（MTPA）（ SOSMO）被采用。基于现有的有源磁通概念，提出了磁通自适应DTFC。因此，可以在稳态和瞬态两种情况下使定子电流幅度最小。此外，为了实现IPMSM的无传感器控制，提出了一种自适应SOSMO。与恒定增益SOSMO相比，自适应SOSMO的增益可以随电动机速度的变化而自适应地进行调整。然后，在宽速度范围内有效地提高了位置估计的精度。使用60 kW IPMSM进行了数值模拟和实验。此外，