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In recent years, as the price of rare-earth permanent magnet fluctuates dramatically, the less-rare-earth interior permanent-magnet synchronous machines (LRE- IPMSMs) used for electric vehicles (EVs) have received more and more attentions. LRE-IPMSMs combine the features of high power density in permanent-magnet synchronous machine (PMSM) and low cost in synchronous reluctance machine (SynRM), which...
Surface permanent magnet vernier (SPMV) motors are gaining more and more attentions over recent years due to their high torque density. Generally, most researches focuses on their applications in low speed, high torque area, and the study on their high speed operation is rarely seen. In this paper, a SPMV motor with 12 slot, 20 rotor pole is evaluated for traction application. The optimal designed...
High frequency (HF) signal injection scheme is widely used to estimate the initial rotor position of Interior Permanent Magnet Synchronous Motors (IPMSM). The accuracy of the estimated rotor position, however, may be degraded by the phase delay caused by pulse width modulation (PWM), digital filters in signal demodulation process, non- ideality of inverter, and so on. To solve this problem, the main...
In this paper, double stator axial field (AF) switched reluctance motor (SRM) was designed for automotive fan application to achieve higher efficiency more than the previously used BLDC and to compare it with 12/8 SRM and single stator AF SRM. The AF type motor has the advantage of producing higher torque per unit volume than radial type motor of the same size and volume. However, the force in single...
Soft magnetic composites (SMCs) is a new kind of powder metal material. Compared with the traditional silicon steel material, it has the advantages of low eddy current loss, isotropic magnetic conductivity and thermal conductivity, easy to make parts with complex structure, and is suitable for motor core materials, especially in high-frequency working conditions. This paper introduces the characteristics...
This paper presents a robust and relatively concise flux-weakening control scheme using anti-windup for induction motor(IM) in high speed region. The proper q-axis current reference in constant-voltage region is achieved for both maximum torque capability and anti-windup phenomenon. Comparing with voltage regulator method, only one tuning parameter ensures the tuning simplification. First, the operation...
This paper introduces a new topology of multi-stator hybrid excitation permanent magnet synchronous motor with flux weakening capacity. The presented machine features a hybrid magnetic circuit in which the flux generated by PMs are routed into two paths by employing an axial stator. The detailed structure of the presented machine is given in this paper together with the principle of flux weakening...
The hybrid flux PMSM includes both axial flux and radial flux, so its design method is different from the traditional cylindrical permanent magnet synchronous motor. In this paper, based on the analysis of the structure and operation principle of the hybrid flux motor, the design principle of the motor is given. The authors study the effects of slotting, permanent magnet thickness, and pole-slot match...
The energy conservation of motors becomes one of the most important areas of industrial energy saving. At present, the majority of motors in industrial applications is induction motors (IMs) which has huge potential for the efficiency improvement. The IMs are nowadays widely used in transportation fields as traction motors or for other electrical devices such as compressors, integrated starter generator,...
This paper studies on characteristics of common- mode voltage (CMV) of a four-leg matrix converter with balanced and unbalanced load. Four groups of switching states are divided and figures of the relationship between CMV peak value and inductance ratio k together with unbalanced factor are presented. The effect of ratio k on CMV amplitude is similar in balanced or unbalanced load. CMV peak value...
An offline optimal flexible load transfer strategy of more electric aircraft including operation mode and fault location of variable frequency starter generator is proposed, whose key innovation is to quantify variable operational safety margin using node voltage flexibility. Firstly, a series of scenes that show the fluctuation of load in different operation mode are generated through the Monte Carlo...
A thermoelectric generator (TEG) can be defined as a low voltage high-current dc power with a linear I-V feature. Even though efficiencies for TEGs are as low as 3-5%, useful electricity generation is possible due to the great amount of heat emitted from almost any electric device. The idea is to convert the thermal energy from any source releasing waste heat directly to electrical energy by a thermoelectric...
Aircraft Generator is the core part in aircraft power supply system, and its internal fault can lead to the stator winding asymmetry. Even worse, the asymmetry output power created by the asymmetry winding can damage the aircraft electrical equipment, so it is significant to study the internal electrical fault of aircraft generator. And the study can provide reference for maintenance decision. In...
Gas starvation affects the performance and life of the proton exchange membrane fuel cell to a certain extent, and the phenomenon of single cell reverse polarity is a threat to the personal safety of researchers in severe cases. In this paper, the single cell of the proton exchange membrane fuel cell is studied. We consider hydrogen starvation and oxygen starvation respectively, and study the effects...
This paper proposes a power decoupling solution based on improved single-phase Y-source inverter with no additional power semiconductors. Single-phase inverter would cause voltage and current ripples on the dc link because of double-frequency power ripple. Commonly, large electrolytic capacitors are connected to dc link in H- bridge inverter to accomplish power decoupling. However, electrolytic capacitors...
There is ripples in the DC bus voltage of the electrolytic capacitor-less air condition motor system because the film capacitor is not big enough to store plenty of energy, which will cause a motor voltage offset and go further causing beat phenomenon in the motor current and the torque. Firstly, the reason of the beat phenomenon in the current and the torque is analyzed mathematically. Furthermore,...
Through analyzing a bidirectional cell-to-Pack equalization circuit, the balancing efficiency and speed of the circuit is different in different work models. The influence of the cells' number in the pack is studied. The balancing power of the circuit is used to measure the equalization speed. In the equalization circuit, the number of the cells in a pack is a critical factor that determines the balancing...
In order to improve the speed-regulation performance of the permanent-magnet synchronous motor (PMSM) system under uncertainties and disturbances, an equivalent disturbance observer (EDO) based discrete-time integral sliding mode control (DISMC) scheme is proposed. To avoid the high-frequency noise caused by the differential terms of conventional sliding mode control (SMC), a discrete-time integral...
This paper attempts to study the effect of energy management strategy based on state machine on the performance of air-cooled fuel cell-battery hybrid system, for which the hybrid power system test platform composed of air-cooled fuel cell, lithium battery and DC converter was built. The reliability and stability of the hybrid system and the effectiveness of the energy management strategy based on...
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