Abstract
The compound-structure permanent-magnet synchronous machine (CS-PMSM), comprising a double rotor machine (DRM) and a permanent-magnet (PM) motor, is a promising electronic-continuously variable transmission (e-CVT) concept for hybrid electric vehicles (HEVs). By CS-PMSM, independent speed and torque control of the vehicle engine is realized without a planetary gear unit. However, the slip rings and brushes of the conventional CS-PMSM are considered a major drawback for vehicle application. In this paper, a brushless flux-modulated CS-PMSM is investigated. The operating principle and basic working modes of the CS-PMSM are discussed. Mathematical models of the CS-PMSM system are given, and joint control of the two integrated machines is proposed. As one rotor of the DRM is mechanically connected with the rotor of the PM motor, special rotor position detection and torque allocation methods are required. Simulation is carried out by Matlab/Simulink, and the feasibility of the control system is proven. Considering the complexity of the controller, a single digital signal processor (DSP) is used to perform the interconnected control of dual machines instead of two separate ones, and a typical hardware implementation is proposed.
Highlights
The increasing energy crisis and environmental concerns have helped revive interest in electric vehicles [1]
The rotating speed of magnetic field generated by stator-1 changes in response to speed variations of internal combustion engine (ICE) and output shaft according to Equation (5) while motor-2 makes torque compensation according to Equation (6), so that driving demands are satisfied
Joint control of the two integrated machines is proposed based on the mathematical models of the compound-structure permanent-magnet synchronous machine (CS-PMSM) system
Summary
The increasing energy crisis and environmental concerns have helped revive interest in electric vehicles [1]. Hybrid electric vehicles (HEVs) like the Toyota Prius utilize a planetary gear unit for power splitting. The CS-PMSM represents the functional integration of the planetary gear unit, generator and motor in the Toyota Hybrid System (THS). Rotor, “pseudo” direct drive is achieved for low-speed applications such as wind power and electric vehicles [9,10,11,12,13]. When both the PM rotor and modulating ring are designed to be rotary, the magnetic-geared motor becomes a brushless DRM. By coupling the DRM with a conventional motor, a brushless flux-modulated CS-PMSM can be realized.
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