Zhang Qianfan

Design characteristics of the induction motor used for hybrid electric vehicle

Design characteristics of the induction motor used for HEV (hybrid electric vehicle) are discussed. Equivalent circuits corresponding to the starting, operating performance and harmonics are given. The selecting rules of the starting voltage and frequency are got. The relations between the iron core and copper loss vs. frequency are analyzed and compared. The influence of harmonics on the induction motor is analyzed. The design principles of the induction motor used for HEV are given considering the impacts of the starting, operating performance and harmonics.

The construction and simulation of V2G system in micro-grid

Vehicle-to-Grid (V2G) technology has caught peoples attention. Applications of V2G in general Power Grid face some challenges. It is complicated to control, in need of large amounts of EVs and hard to realize in the short term. In this paper V2G is applied to micro-grid and V2G system is constructed based on a parking lot. The structure is proposed in which bidirectional AC/DC and bidirectional DC/DC converters share one common DC bus, and also the coordination control strategy is given. Meanwhile this paper presents a general micro-source model as well as a V2G model. Simulation of voltage regulation and renewable energy support is conducted and results prove the availability of proposed structure and control strategy. The work is meaningful to the control and operation for micro-grid and V2G.

Hybrid Switched Reluctance Motor Applied in Electric Vehicles

Electric motor is key part in electric vehicles including hybrid electric vehicle, fuel cell electric vehicle and battery electric vehicle. Wide torque-speed range and high reliability are needed of the motor applied in electric vehicles. Novel hybrid switched reluctance motor is developed. It combines features of robust as switched reluctance motor and that of high efficiency of permanent magnet motor. Flux strengthening and weakening control give large maximum torque and high speed to the motor drives. They are implemented by only simply controlling the magnitude and direction of the current in an additional coil in the motor. Rotor position is detected by the signal from stationary coils in the motor and rotor speed is calculated according to this signal. To test characteristics of the motor drives, an experimental bench is developed. It is easy to test four quadrants torque-speed and dynamic characteristics of the motor drives. The whole testing system is energy saving.

Axial excited hybrid reluctant motor applied in electric vehicles and research of its axial coil signal

Characteristics of traction motors for electric vehicles (EV) should be high power density and high efficiency over the whole working area. The axial excited hybrid reluctant motor is fit for the EV application. In the motor, there are three excitation sources, which are permanent magnetic, armature, and axial coils. Controlling these excitation sources will make the motor run in different modes, which satisfy many kinds of conditions of the vehicle. With special structure and electromagnetic design, the electromagnetic torque includes reluctant torque, and the torque per unit volume is improved. Controlling the axial coil current will adjust the main flux. Then the flux weaken control is convenient achieved. When it is used as generator, main flux can be adjusted. The axial coil can also be used as position sensor. The electromotive force signal denoting the rotor position is added on the dc voltage applied on the axial coils. The paper introduces the structure and principle of the axial excited hybrid reluctant motor and resolves the electromagnetic torque. The axial magnetic field is analyzed. And the relation of the emf of the axial coils with the rotor position is produced. The simulation and experiment are made. The result shows that characteristics of this novel type motor satisfied the demands of the traction motor for EV.

Study of hybrid energy control strategy for hybrid electric drive system in All Electric Combat Vehicles

Battery technology is one of the key factors constraining the development of hybrid electric drive system used in all electric combat vehicles (AECV). At present, single energy storage source is very difficult to meet the requirements for both energy and power in AECV. By adopting hybrid energy structure, existing technology can make full use of the advantages of multiple energy and thus enhance the performance of hybrid energy. According to the characteristics of Ni-MH battery and ultra-capacitor, a strategy was proposed which combines thermostat control with filter control and based on it the simulation analysis was performed. The results showed that the charging and discharging processes of Ni-MH battery had been optimized considerably and the power of hybrid energy was improved enormously.

The principle and design of the permanent magnet bias DC reactor

In this paper, the authors present the principle of the permanent magnet bias DC reactor, examine the linear resolution and design of its magnet circuit, and detail experiments carried out on the reactor.

Hybrid Switched Reluctance Integrated Starter and Generator

Integrated starter and generator (ISG) can be applied on both internal combustion engine (ICE) vehicles and hybrid electric vehicles. High starting torque and wide working speed range are main features of ISG for quick starting and wide speed range generating coupling with the engine. But it is difficult for motor drives to be large torque and large power at high speed at the same time. A novel hybrid switched reluctance motor drives are developed to achieve this high performance. A new flux weaken control is produced. A motor drive is set up and the experiment results show it with torque and speed characteristics suitable for being as ISG

Axial excited hybrid reluctant motor applied in EV and research of its axial coil signal

Characteristics of traction motors for EV should be high power density and high efficiency over the whole working area. The axial excited hybrid reluctant motor is fit for the EV application. In the motor, there are three excitation sources, which are permanent magnetic, armature and axial coils. Controlling these excitation sources will make the motor run in different modes, which satisfy many kinds of conditions of the vehicle. With special structure and electromagnetic design, the electromagnetic torque includes reluctant torque, and the torque per unit volume is improved. Controlling the axial coil current will adjust the main flux. Then the flux weaken control is convenient achieved. When it is used as generator, main flux can be adjusted. The axial coil can also be used as position sensor. The EMF signal denoting the rotor position is added on the DC voltage applied on the axial coils. The paper introduces the structure and principle of the axial excited hybrid reluctant motor and resolves the electromagnetic torque. The axial magnetic field is analyzed. And the relation of the emf of the axial coils with the rotor position is produced. The simulation and experiment are made. The result shows that characteristics of this novel type motor satisfied the demands of the traction motor for EV.

Research on a new accurate thrust control strategy for linear induction motor

Linear induction motors are widely used in electromagnetic aircraft launch systems, conveyor systems, and transportation applications, and the thrust control accuracy of linear induction motors is the most important technical factor for stable running. In this paper, the mathematical model of a linear induction motor was built, and a new accurate thrust control strategy was proposed, which included adaptive parameter identification and thrust deviation correction. The adaptive parameter identification was designed based on the Lyapunov stabilization theory. Then, the thrust deviation correction system was presented based on the q -axis component of the secondary flux, improving the thrust control accuracy and dynamic response. Finally, the simulation model was built for verifying the proposed thrust control strategy.

Parameter Analysis on the Thickness of an Aluminum–Steel Intercepting Plate in Active Electric Armor

Active electric armor will play an important role in the future of armored vehicle protective systems. The active electric armor interceptor is based on the principle of a single-stage coil launcher and must use nonferromagnetic good conducting material as its inductive coil, such as aluminum. However, in order to enhance the interception effectiveness, people hope to use high-strength ferromagnetic material, such as steel. Therefore, in order to gain the best performance, the most possible method is to synthesize the two kinds of materials in actual applications. In this paper, the electromagnetic field characteristics and the force acting on the interceptor are described. First, the mathematical model of the active electric armor interceptor is provided, and the equations of state, thrust, and motion are established, respectively. Since the intercepting plate is made of different materials such as aluminum and steel, the magnetic field distribution and force of the plates present a great difference even at the same launch current. When the intercepting plate is made of aluminum-steel material, the thickness of the aluminum plate, as well as that of the steel plate, has great effect on the thrust force of the plate. Then, a finite-element method is used to analyze the magnetic field distribution and thrust force of the intercepting plate. The result indicates that the thrust force varies with the thickness of the aluminum plate and the steel plate, and there exists an optimum thickness for the plate at different launch currents. This paper provides references for the design of an aluminum-steel intercepting plate in active electric armor.