Abstract
Interior permanent magnet synchronous motors (IPMSMs) are usually used in electric vehicle drives and in other applications. In order to enlarge the speed range of IPMSMs, the flux-weakening control method is adopted. The traditional flux-weakening control strategy degrades the control performance because of parameter mismatches caused by variation of motor parameters. An improved uncertainty and disturbance estimator (UDE)-based flux-weakening control strategy is proposed for IPMSM drives in this paper. The parameter tuning method in the UDE-based control is improved. In addition, a flux-weakening adjusting factor is put forward to reduce the torque fluctuation when the operation point switches between the constant torque region and the flux-weakening region. This factor can be adjusted online by a lookup table. Finally, the validity of proposed method is verified by the simulation and experimental results. The results show that the proposed control strategy can effectively enhance the robustness of the system in the flux-weakening region, and make the system switch more smoothly between the constant torque region and the flux-weakening region.
Highlights
Interior permanent magnet synchronous motors (IPMSMs) have been widely used in the electric vehicle (EV) drives due to their simple structure, wide speed range, high power, and torque density.IPMSMs often run above the rated speed in some applications, such as EVs, which is the maximum speed that the motor can obtain in the constant torque region
An improved uncertainty and disturbance estimator (UDE)-based flux-weakening control strategy for an IPMSM system is proposed to solve the poor robustness caused by parameter variation in the flux-weakening region, and the torque fluctuation when the operation point switches between the constant torque region and flux-weakening region
The maximum torque per ampere (MTPA) control strategy is often used in IPMSMs to achieve the optimal configuration of the given current when the IPMSM runs in the constant torque region
Summary
Interior permanent magnet synchronous motors (IPMSMs) have been widely used in the electric vehicle (EV) drives due to their simple structure, wide speed range, high power, and torque density. The input of the PI controller is the difference between the output voltage amplitude and the maximum available voltage amplitude of inverter This method is simple, independent of motor parameters, and has good robustness, but the dynamic performance needs to be improved. The UDE-based control is applied to surface permanent magnet synchronous motor and proposes a simple parameter tuning algorithm in [19], but does not analyze the operating condition in flux-weakening regions. An improved UDE-based flux-weakening control strategy for an IPMSM system is proposed to solve the poor robustness caused by parameter variation in the flux-weakening region, and the torque fluctuation when the operation point switches between the constant torque region and flux-weakening region.
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