Jiang Jian-zhong

A matlab-based simulation for hybrid electric motorcycle

This paper presents a simulation and modeling package based on Matlab for a parallel hybrid electric motorcycle (HEM). The package consists of several main detailed models: internal combustion engine (ICE), motor, continuously variable transmission (CVT), battery, energy management system (EMS) etc. Each component is built as a library, and can be connected together according to the parallel HEM’s topology. Simulation results, such as ICE power demand, motor power demand, battery instantaneous state-of-charge (SOC), pollution emissions etc. are given and discussed. Lastly experimental data verify our simulation results.

Research of Energy Regeneration Technology in Electric Vehicle

The theory of energy regeneration in electric vehicle (EV) has been introduced in most papers, but the ma thematic model of EV energy regeneration system was little studied. In this paper the ma thematic model of EV energy regeneration system is studied, and then the system ability under four control strategies is analyzed. In the end the system reliability is researched, and the calculation model of system reliability is proposed.

A Novel Current Sensor Technique for Brushless DC Motor Drives

The torque output in a permanent magnet brushless DC motor (BLDCM) is usually controlled by regulating the motor phase currents. In this paper, three kinds of PWM strategies together with some critical review on traditional current measurements in a BLDCM drive system are discussed. A novel method for assessing the PWM information and measuring the motor phase currents by a dc link current sensor is proposed. An attractive feature of the proposed method is the simplicity with the current sample processing because there is no need to incorporate the conduction information of the power switches or diodes. Only the single sided PWM or the double sided complementary PWM is needed with the proposed technique.

Semi-analytical method for air-gap main magnetic field computation of direct drive permanent magnet torque motors

This paper presents a semi-analytical method to computer the air gap magnetic field of direct drive permanent magnet (PM) torque motors for being evaluated slotting effects accurately. The field region is divided into the smooth air gap region and the extended slot sub-regions. The magnetic vector potentials in the air gap region are first solved by the analytical method, and those in the extended slot sub-regions solved secondly by the numerical method. Boundary values in the extended parts of slot sub-regions are obtained by the analytical solutions while permanent magnets are dealt with the equivalent surface current sheets. After combined the results of each slot sub-region the flux density distributions in air gap with slot opening are obtained. The magnetic field distribution and back-EMF computed with the proposed method are verified with those obtained from finite element method (FEM) and measurement.

Direct modeling of induction motors with skewed rotor slots using 2-D multi-slice model and time stepping FEM

The geometrical feature of the skewed rotor slots in induction motors makes the 2-dimensional (2-D) finite element method (FEM) not directly applicable. Based on the multi-slice model in this paper, a time stepping 2-D eddy-current FEM is described to study the steady-state operation and the starting process of induction machines with skewed rotor slots. The fields of the multi-slices are solved in parallel, and thus the effects of skewed slots and eddy-current can be taken into account directly. The basic formulas for the multi-slice model are derived. Special technique to reduce computation time in solving the coupled system equations is also described. The results obtained by using the program developed have very good correlation with the test data.

Analytical calculation of electromagnetic torque for surface mounted permanent magnet brushless motors

With the air gap magnetic field distribution of surface mounted permanent magnet (PM) motors obtained using an analytical technique, the instantaneous electromagnetic torque and its corresponding components are investigated with the Maxwell stress tensor method. Accurate results can easily be achieved using the proposed method without using the tedious finite element analysis (FEA). In this paper, the electromagnetic torque of a surface mounted PM motor with two phases energized is decomposed into four torque components. This technique is useful not only for the design and optimization of the permanent magnet motor, but also for the choice of control strategy.

Application of chaotic modulation to AC motors for electro magnetic interference suppression

Instead of avoiding occurrence of chaos in motor drives, chaos is positively utilized in this paper. A new chaotic pulse width modulation (PWM) scheme is proposed and implemented for AC motors, which functions to significantly suppress harmonic peaks and hence acoustic noise. The key is to employ the Chua’s circuit for generating a desired chaotic sequence. By using a practical induction motor, computer simulation and experimental results verify that the chaotic PWM has advantages of harmonic peak suppression and simple hardware implementation over the conventional PWM and random PWM.

A practical permanent magnetic motor drive for hybrid motorcycle

A novel embedded-type permanent magnetic motor for hybrid motorcycle, which employs asymmetric design of eccentric air-gap, is proposed in the paper. This special design of air-gap well conforms to the mono-directional operation characteristic of motorcycle and effectively suppresses the distortion of air-gap magnetic field caused by armature reaction. Hence the torque ripple is reduced. A drive system consisting of the newly-designed Nd-Fe-B permanent magnet synchronous motor and parallel-MOSFET three-phase inverter for hybrid motorcycle propulsion is established. Wide-range speed operation is realized through a simple and novel control strategy. Computer simulation is described and experimental results given to verify the practicality of the proposed motor design and control strategy.