| With new energy vehicles becoming one of the core strategies for national development,new energy vehicles have been rapidly developed in recent years.The interior permanent magnet synchronous motor(IPMSM)has been widely used in battery electric vehicles motors,due to its superior performance,such as a simple structure,high volume power and torque density and small moment of inertia.This paper will focus on the development and application technology of permanent magnet synchronous motor controller for A0 battery electric SUV of an automobile enterprise.This paper mainly carried out the following research work.First of all,according to the vehicle design goal,the main performance parameters of the electric drive system are determined.Then the basic structure and its characteristic of the permanent magnet synchronous motor are described.The technical characteristics of the IPMSM and the SPMSM are compared,and the IPMSM is selected as the research object of this paper.The Ansys-Maxwell software is used to build a finite element model for the permanent magnet synchronous motor.With the motor magnetic saturation effect considered,different combinations of d-axis and q-axis currents I_d and I_q input based on the current scanning method,the d-axis and q-axis inductance L_d and L_q and the d-axis and q-axis fluxesψ_d andψ_q are calculated.Afterwards,through a bench test,the counter electromotive force,the permanent flux,the stator winding resistance,and the d-axis and q-axis inductance values under different working conditions for the permanent magnet synchronous motor are tested,and the simulation data and the test data are compared and analyzed.The existing control strategies and methods commonly used by the permanent magnet synchronous motor are described.Finally,the MTPA method is used as the control strategy for rates lower than the basic rotation rate of the permanent magnet synchronous motor.MPC and MTPV are preferably selected as the flux weakening magnetic control strategy for rates higher than the basic rotation rate of the permanent magnet synchronous motor.The problems of existing permanent magnet synchronous motor control algorithms are analyzed.A model control strategy that considers a permanent magnet synchronous motor model with variable inductance parameters is proposed.The function of the MATLAB software is used to find the solutions to the L_d Map,the L_q Map,the I_d Map and the I_q Map offline.By taking the actual application conditions of battery electrical vehicles into account,the motor control parameter MAP table calculation method that considers different voltage ranges is proposed.Finally,a motor control simulation calculation model containing a current loop,a speed loop,a PI parameter adaptive regulation module,an SVPWM module,an inverter module,a permanent magnet synchronous motor module and others is set up by using the Simulink software.The effectiveness of the control strategy and the control model is verified through software simulation and testing.At the same time,the hardware of the low-voltage control circuit and high-voltage drive circuit of the motor controller is designed with the Infineon TC1782F chip as the core controller.The hardware control circuit mainly consists of a main control chip circuit,a power supply circuit,an external memory circuit,a resolver decoding circuit,a PWN generation circuit,a CAN communication circuit,a JTAG commissioning circuit and others.Finally,the motor controller control algorithm is verified through the bench test,which fully proves the feasibility and effectiveness of the motor control strategy based on the permanent magnet synchronous motor variable inductance parameters. |
