Sensorless Control of Permanent magnet in-wheel motor for EVs Using Global Fast Terminal Sliding Mode Observer

Area of Science:

• Electrical Engineering
• Control Systems
• Automotive Technology

Background:

• Permanent magnet in-wheel motors (PMIWMs) are crucial for electric vehicles (EVs).
• Position sensor failures in EVs can compromise motor control and safety.
• Existing sensorless control methods often suffer from chattering and oscillations.

Purpose of the Study:

• To develop a high-precision sensorless controller for PMIWMs in EVs.
• To address unexpected position sensor failures.
• To improve the robustness and accuracy of motor control under fault conditions.

Main Methods:

• Implementation of a global fast terminal sliding mode observer (GFTSMO) to minimize chattering.
• Integration of a phase-locked loop (PLL) estimation scheme to replace conventional arc-tangent methods.
• Analysis of GFTSMO stability using Lyapunov functions.

Main Results:

• The proposed GFTSMO significantly reduces chattering compared to traditional sliding mode observers (SMO).
• The PLL estimation scheme enhances precision and robustness by avoiding high-frequency oscillations.
• Simulations and experimental tests confirm rapid and accurate speed tracking without overshoot.

Conclusions:

• The developed sensorless control method ensures stable operation of PMIWMs even with sensor failures.
• This approach offers a reliable solution for situations where motor sensors are difficult to install.
• The technique enhances the overall reliability and applicability of sensorless control in electric mobility.