The operating performance improvement of an interior permanent magnet synchronous motor (IPMSM) drive via robust current control and intelligent commutation tuning is studied in this paper. First, the nominal motor parameters are estimated and a robust current control scheme is designed to possess close and robust winding current tracking performance. It is known that the torque generating capability of an IPMSM is affected by the changes of commutation instant and field excitation. The proof is given to show that the latter can be equivalently achieved by tuning the commutation instant, and the effects of these two variations on the IPMSM drive performances under speed open-loop and closed-loop conditions are observed analytically and experimentally. Then accordingly, an intelligent tuning approach is developed to automatically determine the advance of commutation instant. The minimum current command is achieved to obtain better torque generating capability equivalently. A DSP-based IPMSM drive is established and the effectiveness of the proposed control approaches is demonstrated experimentally.
"The other disadvantage is that the DOB scheme needs to be combined with other controllers to control the system. In , the DOB scheme used for motor current control still needed to be combined with a PI feedback controller and a feedforward controller to control the current. The same is true in  where the DOB scheme is combined with a PI feedback controller and adaptation law in the motor current control loop, so the current control algorithm will be more complex and difficult to realize. "
[Show abstract][Hide abstract] ABSTRACT: A robust uncertainty controller with a system delay compensation for an ironless linear permanent-magnet synchro- nous motor (ILPMSM) system with unknown system parameters has been investigated. The proposed controller consists of an inverse of the first-order reference model with an input deduction and integral term. The system delay compensation adopts an inverse system delay model to compensate the system transport delay effect. The proposed control scheme can reduce modeling uncertainty due to the difference between the reference model and the unknown real system model and disturbance due to d-q-axis coupling effect. The advantages of the proposed control algorithm are as follows: First, the system response which can be achieved is similar to that of the designed nominal reference model. In other words, the dc gain of the controlled system is denoted as one, so the proposed algorithm does not need to be combined with other control algorithms. Second, it does not require the system parameters to be known precisely. Our experimental results con- firm the feasibility of the proposed scheme to compensate for the effects of uncertainty disturbances and system transport delay in the practical application of an ILPMSM system with unknown parameters.
[Show abstract][Hide abstract] ABSTRACT: To operate a permanent magnet synchronous motor (PMSM) at a maximum torque per ampere (MTPA) operation point, the exact values of machine parameters such as inductances and back-EMF constant, which are sensitive to motor phase currents and temperature respectively, should be blown. An adaptive estimation method for on-line estimation of the machine parameters is not suitable for practical applications since it has difficulties in estimating exact values and requires complex mathematical calculations. The purpose of this paper is to present a simple MTPA operation point tracking control strategy for vector controlled PMSM drives with slow dynamic loads. The proposed method searches MTPA operation points by modulating current phase angle and observing the variation in command power. The current angle modulation strategy is designed to sense the effect of load variations in the command power. Therefore, the proposed method can track the MTPA operation points of the PMSM regardless of load variations. Computer simulation and experimental study is also presented to show the effectiveness of the proposed method.
[Show abstract][Hide abstract] ABSTRACT: This paper presents the robust current and torque controls for a satellite reaction wheel driven by permanent magnet synchronous motor (PMSM). First, the motor nominal key parameters are estimated, and the DSP-based motor drive is established. Then a winding current control scheme is proposed, wherein a traditional two-degrees-of-freedom controller (2DOFC) is augmented by an internal model feedback controller or a robust tracking error cancellation controller. Good sine-wave current tracking and back electromotive force (EMF) rejection performances are obtained. The similar robust control approach is also applied to perform the motor observed torque control with quick and close tracking response.
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