Abstract
This article describes an electric drive system’s topology with a permanent magnet synchronous motor for a wide speed range applications. Topology consists of a synchronous motor with permanent magnets (PMSM) and two inverters connected to the beginnings and to the ends of the PMSM’s stator windings. The first inverter is connected to a storage battery, while the other one to a floating bridge capacitor, which acts as a back-EMF compensator. The article proposes electric drive system topolo-gy and its control algorithm. Simulation modeling was implemented by the MATLAB/Simulink software package. Simulation results shows that the proposed electric drive system, in comparison with the standard topology with a «star» stator windings connection, is able to increase the maximum speed of PMSM in the field weakening mode by 17%. The maximum achievable torque on the rotor shaft at the maximum speed of the PMSM motor was increased by 16.6%. Also, developed topology allows to in-crease the speed range in the constant torque mode by 34%.
Highlights
At present, in-wheel motors usage, in the composition of vehicles, is a promising solution due to the following advantages: the rejection of mechanical energy converters, which contribute to additional losses in the system, reducing the final mass of the vehicle, its distribution and, increasing the efficiency of the system [1,2,3]
For full-fledged use of permanent magnet synchronous motor (PMSM) topology with an open-end winding and a floating bridge capacitor in the vehicle, it is necessary to develop a control algorithm of the abovementioned electric drive system for use in a wide speed range, as well as to conduct a comparative analysis of the proposed topology and its control algorithm in comparison with the technical solutions already used for such purposes
The main blocks of the model are: “OWPMSM”, the simulation block of the PMSM with open stator winding, main and auxiliary IF; “Vehicle Dynamics,” the simulation block of vehicle motion dynamics with in-wheel motors, simulation of which was performed in accordance with [37]; “Drive Controller,” the block of formation of control impulses for PMSM; “Inputs,” the block of formation of the task for acceleration, braking, as well as setting parameters of the roadway slope and the speed of the oncoming wind flow; “Vehicle Controller,” the block of formation of the task for the moment based on the data received from the block “Inputs.”
Summary
In-wheel motors usage, in the composition of vehicles, is a promising solution due to the following advantages: the rejection of mechanical energy converters (gearbox, differential, constant velocity joints), which contribute to additional losses in the system, reducing the final mass of the vehicle, its distribution and, increasing the efficiency of the system [1,2,3]. Based on the comparative analysis carried out in work [10], the permanent magnet synchronous motor (PMSM) is the most suitable type of electric motor forin-wheel motors. Both domestic and foreign authors have developed systems designed to control PMSMs at a wide range of speeds. No works have so far considered the electric drive system using permanent magnet synchronous motors with open-endstator winding and a floating bridge capacitor as a part of a vehicle using in-wheel motors
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