Abstract
The motor drive system represents a key technology for development of the electrical vehicles, and the permanent magnet synchronous motor becomes the mainstream of the new energy vehicle drive motor for the superior performances in power density, low-speed torque density, efficiency and reliability. The paper studies the field weakening control strategy for the interior permanent magnet synchronous motor (IPMSM) and provides a field weakening control strategy for the IPMSM at the full-speed range. By studying the mathematical IPMSM model and the methods of conventional vector control and analyzing the operating conditions of the IPMSM at the full-speed range, the paper divides the operating conditions into constant torque operation region I, constant torque operation region II, constant power field weakening operation region and high-speed field weakening operation region to confirm the control strategy algorithm in each region and the transition conditions between regions and provide the current control strategy that the d-axis current and q-axis current are confirmed by the reference torque and the feedback speed. Modeling of the field weakening control strategies in each region is made through the Matlab/Simulink, and simulation of the operating conditions with a steady-state load and a dynamic load is done to verify that the field weakening control strategy in each region is feasible. A co-simulation is made by combining the Matlab/Simulink-based control model, the RecurDyn-based virtual prototype and the RT-LAB to verify the feasible field weakening control strategy.
Highlights
The PMSM features a small size, the low inertia and the fast response to have the superior performances in power density, low-speed torque density, efficiency and reliability
The motor of the kind is very adaptive to the electric vehicle's drive system to become the mainstream motor for the new energy vehicles at moment
During analysis of the mathematical PMSM model, the following hypotheses are proposed to simplify the analysis process: The stator's armature winding generates a sine wave to induce the electromotive force and the rotor's permanent magnet distributes the field of the sine wave form in the air-gap space; The eddy current and hysteresis losses are negligible for the core; The stator core has the negligible saturation with the constant inductance parameters and the magnetic circuit is considered linear; The damper winding is negligible for the rotor
Summary
The PMSM features a small size, the low inertia and the fast response to have the superior performances in power density, low-speed torque density, efficiency and reliability. The field weakening expansion represents a key problem to hinder extensive application of the high-speed PMSM. The domestic and foreign scholars have been attaching most importance to the problem and made great efforts to have a lot of study achievements. These studies have the deficiencies in either the motor body or the control to combine speed, power and torque well. For this reason, the paper studies the field weakening strategy for the IPMSM to provide a field weakening strategy for the PMSM at the full-speed range
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