Dual Mechanical Port Electric Machine Research Articles

RETRACTED: Electromagnetic performance analysis of the novel dual-mechanical-port electrical machine with Halbach permanent magnet array

The dual-mechanical-port electrical machine (DMPEM) is a new kind of power coupling device for hybrid electric vehicles. In this paper, the structure of the DMPEM is improved, and the planetary gea...

Optimal Control for a Hybrid Excited Dual Mechanical Port Electric Machine

An electrical variable transmission (EVT) is an electrical machine consisting of a stator and two concentric rotors. It is a competitive alternative for power split devices used in current series–parallel hybrid electric vehicles (HEVs). Although tending to have high power densities, permanent magnet (PM) machines suffer from no-load iron losses. Since the torque interaction between stator and outer rotor is low during large time intervals, the EVT in this paper possesses a flux bridge with dc-field winding to modulate the stator field, while maintaining the inner rotor flux linkage. In this paper, a torque controller is proposed that optimally combines the stator, dc-field, and inner rotor currents in order to minimize the copper and iron losses in every operating point of torque and speed on both rotors. Also the electromagnetic coupling between both rotors is considered. It turns out that there are two optimal load angles for the stator currents, of which one of the two is dominant depending on speed and torque. The control is tested on a 120 kW prototype EVT, and measurement results are given to illustrate the optimal performance obtained with the proposed torque control. In addition, efficiencies are measured in order to support the statements made concerning the proposed method.

Modeling and Control for Cage Rotor Dual Mechanical Port Electric Machine—Part II: Independent Control of Two Rotors

Application of electric machines in the traction and transmission systems of hybrid/electric vehicles has been studied for many years. The hybrid vehicle based on dual mechanical port (DMP) electric machine has gained more and more attention, because it eliminates the need for planetary gear and combines the motor and the generator into a compact electric machine. The DMP machine with a squirrel-cage outer rotor (SCDMP) is investigated in this paper. Due to its unique electromagnetic characteristics, control algorithms for conventional machines cannot be applied to the SCDMP machine. The methods to calculate the correct current commands and estimate the outer rotor flux position are proposed. Based on these two methods, a control algorithm for the SCDMP machine is proposed and estimated by simulation. The results show that the proposed control algorithm is able to independently control the torque productions and the flux levels of the two rotors of the SCDMP machine.

Modeling and Control for Cage Rotor Dual Mechanical Port Electric Machine–Part I: Model Development

A new type of electric machine with two free rotating rotors [dual mechanical port (DMP)] is investigated in this paper. Since this DMP machine has a squirrel-cage outer rotor, it is named as SCDMP machine. First, the electromagnetic characteristic of the SCDMP machine is analyzed. Then, the transient model and steady-state model of the SCDMP machine are derived. The proposed machine models are verified by finite element method and simulation. The results show that the proposed models accurately represent the unique electromagnetic characteristics of the SCDMP machine.

A Novel Control Strategy for HEV Using Brushless Dual-Mechanical-Port Electrical Machine on Cruising Condition

Brushless Dual-Mechanical-Port Electrical Machine (BLDMPEM) is a new type of motor designed for Hybrid Electric Vehicle (HEV), which contains two mechanical ports and two electric ports. Compared with Dual-Mechanical-Port Electrical Machine (DMPEM), the brushless structure brings higher reliability and easier maintenance. In this paper, the model of BLDMPEM is discussed. In Chapter 2, the energy flow and mathematical model of BLDMPEM are analyzed. Then a novel three-phase half-bridge controlled rectifier topology and its control strategy for cruising mode of HEV based on BLDMPEM are proposed in Chapter 3. Compared with the Field Oriented Control (FOC) strategy of BLDMPEM, the proposed method does not require accurate motor parameters, and it is much simpler and easier to be implemented. At last, simulation and experiment results show the feasibility and validity of the proposed strategy.

Application and simulation of dual-mechanical-port machine in hybrid electric vehicles

Summary There are growing interests in electric and hybrid electric vehicles (HEVs) because of environmental concerns. Recent efforts are directed toward developing an improved propulsion system for electric and HEVs applications. In a conventional series–parallel HEV, a planetary gear is used to integrate the power of internal combustion engine and two electric machines into the drive train so that the engine can always operate with the highest efficiency while the vehicle runs at any desired speed and torque. However, two electric machines and associated power inverters along with a planetary gear make the HEV drive train much more complicated and bulky in size. Dual-mechanical-port electrical machine (DMPM) is a new breed of energy conversion device with more compact and integrated structure that can potentially realize an efficient electrical variable transmission for HEV applications. This machine can replace the planetary gear and two electric machines of conventional structure in order to make their structures much simpler. Applying a proper power management and control strategy to have a good driving performance for a series–parallel HEV based on DMPM are the main contributions of this paper. Because Toyota Prius II (Toyota Motor Sales, U.S.A., Inc., Torrance, CA, USA) is a well-known series–parallel HEV, the parameters of this vehicle are chosen as a practical example in simulation results. Copyright © 2014 John Wiley & Sons, Ltd.

Control of the dual mechanical port electrical machine and its applications in hybrid electrical vehicle

AbstractThis paper deals with the control strategy of the dual mechanical port electrical machine (DMPEM) which is suitable for hybrid electrical vehicles. In particular, it discusses the power management algorithm of the electrical variable transmission (EVT) system based on DMPEM. Also an equivalent circuit of DMPEM has been proposed for the first time, which gives clear physical meanings to all components in the circuit. The power flow of DMPEM under different operating conditions is analyzed from the equivalent circuit. The proposed control strategy is validated on a simulated EVT experiment platform. The result proves its validity. © 2012 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

Dual-mechanical-port electric machines-concept and application of a new electric

In this article, the various possible structures of a dual mechanical port (DMP) electric machine are explored and operation features discussed. Further, dynamic modeling of the DMP electric machine is presented. In particular, the salient features and suitability of DMP machine to hybrid electrical vehicles (HEVs) are discussed.

A New Breed of Electric Machines - Basic Analysis and Applications of Dual Mechanical Port Electric Machines

Conceptually, mechanical port of an electric machine can be doubled and the concept of dual-mechanical-port (DMP) will then give birth to a new breed of electric machines. In this paper, the various possible structures of DMP electric machine are discussed. Basic modeling and analysis issues related to the DMP electric machine are presented. An exemplary design of DMP machine is given and verified by FEM results. Potential applications and future research work are given to conclude the paper.