Research On Magnetic Functional Integrated Motor Drive And Calculation Of Field Winding Parameters

In order to further increase the power density of motor drive system and reduce the volume and cost,the integration method of motor and drive circuit has gradually become the focus of researchers.The concept of magnetic functional integration means that,the motor and the drive circuit share the same magnetic components to realize different functions required respectively,so the number of magnetic components for the drive system can be saved.However,in magnetic functional integrated drive,there are power coupling and magnetic coupling between motor and its drive circuit,which may not be designed independently with conventional ideas.The key to solve the problem is to determine the field winding parameters.Considering this case,a method of mapping design constraints of drive circuit to the plane of torque and speed to determine the field winding parameters is proposed.It is applied to magnetic functional integrated DC motor drive and magnetic functional integrated flux-switching motor drive,and the analysis of experiment and simulation is carried out.The specific contents are as follows:(1)Taking the magnetic functional integrated electrically excited DC motor driven by Buck-Boost converter as an example,a method of calculating the field winding parameters for this scheme is proposed.In this method,the constraint boundary curves of the drive circuit are displayed on the torque-speed plane,and their influence on the motor output can be visualized.Based on this method,the field winding parameters of magnetic functional integrated DC motor are calculated.(2)The prototype is made,and the performance of magnetic functional integrated DC motor drive is compared with the conventional scheme.The test results prove that,the magnetic functional integrated scheme has higher efficiency and lower copper loss.At the same time,the magnetic functional integrated scheme saves an additional inductor for motor drive,which reduces the cost of the whole system.(3)Taking the magnetic functional wound-field flux switching machine driven by Boost converter as an example,the magnetic functional integrated AC motor drive is furtherly studied.The topology and basic principle of this motor are described,and the model of motor and drive circuit design constraint are deduced.Then the field winding parameters are calculated.(4)The three-phase 12 / 11 wound-field flux switching machine is designed and optimized,and its electromagnetic performance is analyzed by finite element simulation software.(5)The magnetic functional integrated flux switching motor drive is simulated to verify the feasibility of the magnetic functional integrated scheme and the performance of the control system.Compared with the conventional scheme through simulation,magnetic functional integrated scheme has higher efficiency and lower copper loss.