Abstract
Abstract: In this paper, an effective method to achieve accurate and efficient torque control of an interior permanent magnet synchronous motor (IPMSM) in electric vehicles, based on low-resolution Hall-effect sensors, is proposed. The high-resolution rotor position is estimated by a proportional integral (PI) regulator using the deviation between actual output power and reference output power. This method can compensate for the Hall position sensor mounting error, and estimate rotor position continuously and accurately. The permanent magnetic flux linkage is also estimated based on a current PI controller. Other important parameters, such as the d-axis and q-axis inductances, stator resistance, and energy loss, are measured offline by experiments. The measured parameters are saved as lookup tables which cover the entire current operating range at different current levels. Based on these accurate parameters, a maximum torque per ampere (MTPA) control strategy, combined with the feedforward parameter iteration method, can be achieved for accurate and efficient torque control. The effectiveness of the proposed method is verified by both simulation and experimental results.
Highlights
The interior permanent magnet synchronous motor (IPMSM) has been widely used in electric vehicles for its high efficiency and high power density
The permanent magnetic flux linkage is estimated based on a current proportional integral (PI) controller
PI controller withwith feedforward control control voltage based on space vector pulse width modulation (SVPWM) is shown in Figure 3 [19]
Summary
The interior permanent magnet synchronous motor (IPMSM) has been widely used in electric vehicles for its high efficiency and high power density. An effective method to achieve accurate and efficient torque control of an IPMSM in electric vehicles, based on low-resolution Hall-effect sensors, is proposed. To obtain the high-resolution rotor position, an estimation method based on the power closed-loop is proposed with low-resolution Hall-effect sensors. This method can compensate for the Hall position sensor mounting error, and estimate the rotor position continuously and accurately. The permanent magnetic flux linkage is estimated based on a current proportional integral (PI) controller Other important parameters, such as the d-axis and q-axis inductances, stator resistance, and energy loss are measured offline by experiments.
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