Research On The Control Modeling And Test Of PMSM

The current drive system for new energy vehicles is one of the three core components of new energy vehicles.The characteristics of the motor drive control system of the new energy vehicle determine the main performance indicators of the car.The entire drive system of an electric vehicle is divided into two parts,one part is the motor drive system,which is the motor,power converter,controller and various sensors such as current,voltage and position sensors,etc.The other part is the mechanical part,mainly Than control and so on.The core of the motor drive system is the control algorithm.When a permanent magnet synchronous motor is selected,its inherent performance parameters are basically determined.However,whether or not it can play its greatest utility is the focus of the motor controller.This article based on the performance requirements of electric vehicles on the power system:(1)A wide range of speed control: New energy vehicles mainly have two forms of operating conditions,one is when starting,accelerating,climbing,requiring constant work Moment area;another kind in the high speed area,requiring the motor to work in the constant power area;(2)High power density: mainly used to improve the cruising range,as far as possible in the small car space limit,the battery capacity,as far as possible Enhance the cruising range;(3)Safe and reliable: that is,to ensure the stability and reliability of the controller;(4)Overload capacity: 4 times more overload capacity in starting,climbing,and accelerating.In-depth analysis of some important control algorithms and control essence in the field of permanent magnet synchronous motor control to meet the requirements of the electric motor controller for electric motors.The main research work is as follows:(1)Explain the development status of permanent magnet synchronous motor and control,including the selection status of different motor drive systems for new energy vehicles at home and abroad,and study the significance of motor control.After the motor is selected,its internal parameters are fixed.However,whether or not the motor can play its role requires the ability to control the motor controller.(2)Introduce the categories of permanent magnet synchronous motor,perform coordinate transformation in the process of permanent magnet synchronous motor control,mathematical modeling of permanent magnet synchronous motor in rotating coordinate system,including theoretical basis such as feed forward decoupling.(3)In order to achieve a wide range of torque and overload capacity during start-up,acceleration,climbing,etc.,there is a high constant power range in the high-speed area,a theoretical analysis of the over-modulation control,and a model for simulation analysis.The application of the over-modulation technology of magnetic synchronous motor is conducive to improving the utilization of the DC bus voltage,realizing the output of the full-range voltage,and also helping to increase the overload capacity;Studying the essence of the MTPA control strategy under the same hardware-based conditions Next,as much as possible to output a larger torque,to improve the overload capacity of the drive system;to study the inherent nature of weak magnetic control,the establishment of a different weak magnetic control model,in addition to the traditional model based on the depth of the weak magnetic field control to ensure More power output and higher motor speed requirements;Study of permanent magnet synchronous motor direct torque control,simple structure,fast dynamic torque response,not perturbation of system parameters,strong resistance to external disturbances,ie robust Strong;study of the speed sensorless control of permanent magnet synchronous motor,there is a large space for the cost reduction of the product.(4)Relying on an automotive enterprise platform,analyzing the performance requirements of the vehicle electric drive system,developing the permanent magnet synchronous controller,calibrating the external characteristic curve of the motor,and verifying the software control of the hardware controller in the ring and dragging test motor controller.Corresponding control functions,etc.;Finally,the real-vehicle test test controller developed the performance requirements of torque,speed,and efficiency,and further defined the realization of control algorithms such as MTPA control,over-modulation control,torque control,and field weakening control.