Abstract
In this paper, a new control strategy for hybrid excited salient permanent-magnet synchronous motor (HEPMSM) is proposed, where both armature winding and DC field windings are located in the stator. The developed control strategy fulfills the required characteristics of the electric vehicles (EVs) and hybrid electric vehicles (HEVs) motors. A detailed mathematical model of the HEPMSM is presented. The field current (FC) is kept constant near its rated value for the high acceleration constant torque (CT) region. The conventional control usable method of reducing FC and reversing it on the motor performance characteristics through the constant power (CP) region is examined and evaluated. A proposed FC pattern is applied to three deferent operating modes of EV. High acceleration and wide stable constant power speed range without overdesign is the main target of this work. Based on the deduced optimum control pattern, the required EV-HEPMSM performance characteristics are developed. The required d–q control armature, field currents as well as d–q stator voltage components are provided for either current or voltage control technique availabilities. Simulation work is carried out on the commonly used method and on the proposed method. The obtained simulated characteristics effectively validate the target of the proposed steady-state presented analysis and pattern.
Highlights
The electric motor forms the central core of an electric vehicle
Control strategy model is provided in practical ideal torque–speed is for electric vehicles (EVs)-hybrid excited salient permanent-magnet synchronous motor (HEPMSM) and is organized as follows
A high acceleration as possible is required to applying a ZDAC strategy which results in maximum stator current with minimum armature copper fulfill the required wide constant power speed range (CPSR) for EV
Summary
The electric motor forms the central core of an electric vehicle. It has to fulfill requirements that are more severe than in other industrial sectors. The important required characteristics for electric vehicles (EVs) and hybrid electric vehicles (HEVs) motor drives are a wide speed constant power capability, low-speed high-torque hill-climbing, high torque density (Nm/kg), high power density (kW/kg), minimum size and mainly high operational efficiencies. At speeds beyond the base speed, the flux-weakening operating range of the permanent-magnet is limited and requires an additional stator negative current component. This would lower the efficiency and power factor which in turn has a direct impact on the sizing of the power converter [8]. Main types of hybrid excitedsalient salientpermanent-magnet permanent-magnet synchronous motor (HEPMSM)
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