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Research on flux switching machines (FSMs) has been an attractive topic recently due to tremendous advantages of robust rotor structure, high torque, and high power capability that suits for intense applications. However, most of the investigations are focusing on inner rotor structure which incongruous for direct drive applications. In this paper, the design optimization and performance analysis...
This paper presents a study on control strategy for active vibration cancellation and noise reduction in SR motor. It has been revealed that 2-stage commutation control based on natural frequency of stator body has been effective to suppress the vibration occurring on the stator body at the commutation. According to some considerations on generation mechanism of the vibration, a new active vibration...
This paper proposes a novel variable speed motor drive, wound field synchronous motor (WFSM) drive integrated with Z-source inverter (ZSI). The proposed WFSM is non-permanent magnet machine and employs two field coils as dc field mmf sources. On the other hand, ZSI has an impedance-network which is composed of two dc reactors and two capacitors. In the proposed drive, the two field coils of WFSM act...
A new structure of field excitation flux switching motor (FEFSM) as an alternative candidate of non-Permanent Magnet (PM) machine for HEV drives is presented in this paper. Design principles and initial performances of the proposed motor at various rotor pole numbers with 12 stator slots are demonstrated. Initially, the coil arrangement tests are examined to validate the operating principle of the...
In electric machine, there are several types that are practical for EVs. However, most of commercial EV including these types of motors used single motor and transmission gears coupled to the wheels. This system leads to the transmission losses and reduce the efficiency and reliability of the motor. Therefore, in-wheel direct drive mechanism is introduced to overcome this problem. In-wheel direct...
This paper presents drive performance comparisons among three-types of current profiling techniques minimizing torque ripple for switched reluctance (SR) motor in terms of current ripple, a number of switching of converter, motor efficiency and noise. As SR motors have strong magnetic nonlinearity, hysteresis current control is commonly used for their drives. In this case, however, switching frequency...
This paper presents experimental drive performances evaluation of wound field flux switching motor for hybrid vehicle drive applications. A test machine with the maximum torque of 210Nm and the maximum power of 123kW expected at its design stage is built. A various experimental test result is demonstrated from viewpoints of the maximum torque and the maximum power capabilities and the motor efficiency...
Immunosuppressive environmental chemicals may increase the potency of allergens and thereby play a role in the development of respiratory tract allergies, such as allergic rhinitis and asthma.We investigated the association between environmental immunosuppressive chemicals and the allergic airway inflammation development.We used a mouse model of ovalbumin (OVA)-induced allergic airway inflammation...
Research and developments of in-wheel motors applied in pure electric vehicles (EVs) propulsion systems have attracted great attention recently. This is due to their definite advantages of great controllability for each independent wheel as well as the availability of more cabin space due to removal of conventional mechanical transmission and differential gears. Moreover, more series batteries can...
Research and development of hybrid excitation flux switching motors (HEFSMs) that combined both permanent magnet (PM) and DC field excitation coil (FEC) as their main flux sources have been an attractive investigation recently due to their overwhelming performances as well as flux control capabilities. Among different types of HEFSMs, the motor with both PM and FEC located on the stator has the advantage...
Flux switching machines (FSMs) that consist of all flux sources in the stator have been developed in recent years due to their advantages of single piece and robust rotor structure suitable for various speed applications. They can be categorized into three groups that are permanent magnet (PM) FSM, field excitation (FE) FSM, and hybrid excitation (HE) FSM. Both PMFSM and FEFSM has only PM and field...
In this paper a new hybrid excitation flux-switching motor (HEFSM) with an outer-rotor configuration is proposed for in-wheel drive EV applications. The principles of operation and performances on the initial design motor are studied. The profile of back-EMF, cogging torque, magnetic flux distribution and load analysis are evaluated. Initially, coil arrangement and zero rotor position tests are implemented...
In this paper, precise pulsewise current drive for switched reluctance motor under subharmonic PWM voltage control is presented. Different from the conventional hysteresis current control, sub-harmonic PWM scheme enables to design switching frequency of converter. However, subharmonic PWM voltage control requires adequate voltage references, that is, PWM duty ratios according to given operating conditions...
This paper proposes instantaneous current profile tracking control for minimizing torque ripple of switched reluctance motors. Because of its unique principle of torque generation different from conventional AC motors, instantaneous current profiling control is essential to regulate the torque with ripple minimized. In addition, since its conventional motor model in order to determine an adequate...
Flux switching machines (FSMs) that consist of all flux sources in the stator have been developed in recent years due to their definite advantage of single piece robust rotor structure suitable for high speed applications. They can be categorized into three groups that are permanent magnet (PM) FSM, field excitation (FE) FSM, and hybrid excitation (HE) FSM. Both PMFSM and FEFSM has only PM and field...
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