Permanent magnet synchronous motors (PMs) have been widely used for industrial applications due to their large torque to inertia ratio, high power density, high power factor, extended bearing and efficient insulation life time, superior energy efficiency and great dependability. Traditional Proportional-Integral (PI)-based control techniques are still the most widely utilized method due to the ease of implementation and simplicity. However, it is sensitive to uncertainties and disturbance. Therefore, novel sliding mode approaches for Maximum Torque Per Ampere (MTPA) and Maximum Power Per Ampere (MPPA) control of interior permanent magnet synchronous motor (IPMs) drives are proposed in this paper.&nbsp;Sliding mode control design is a two-step procedure: The first step is to choose a control law, which will steer the systems state variable to sliding surface even during troublesome environments. And the second step is to create a switching function that keeps the system trajectory on the sliding surface satisfying the design specifications. Applying the first-order sliding mode control is known to have a undesirable performance limitation known as the chattering phenomenon. Chattering, often caused by the non-ideal switching devices and the time delays in microprocessors, is a high frequency movement which makes the state trajectories quickly oscillating around the sliding surface. If chattering phenomenon is severe, it can cause performance degradation in the control system effectiveness or even may lead to damage or failures of the system. To address this limitation, we propose the complete derivations of the higher-order sliding mode control based on the super twisting algorithm.&nbsp;&nbsp;We first derive the first-order sliding mode control methods to improve the field oriented control's resiliency against the external perturbations, extraneous noise and modeling uncertainties. And after that, we propose the higher-order sliding mode control to significantly reduce the chattering phenomenon which is inherent in the first order sliding mode control method. Based on the comparison studies, the conventional proportional-integral (PI) based field oriented control shows sluggish response and is more sensitive to parameter perturbations and external torque disturbances. By introducing the novel sliding mode control methods, both of the speed and torque regulation performance of interior-mounted permanent magnet synchronous motor can be greatly improved.&nbsp;Computer simulation studies have shown the superior performance of the first-order and higher-order sliding mode controllers for interior permanent magnet synchronous motor speed and torque regulation applications.&nbsp;For future work of this paper, the proposed control schemes show promising applications in electrified vehicles in improving the vehicle's torque and speed regulation, and the overall driving experience, controllability, reliability, safety and efficiency.

Optimal Interior Mounted Permanent Magnet Synchronous Motors Mtpa and Mppa Control Based on Sliding Mode Approaches

Paper Proceedings: https://asmedigitalcollection.asme.org/IMECE/IMECE2021/volume/85543

ASME 2021 International Mechanical Engineering Congress and Exposition (IMECE2021)

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