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To solve the problems of rotor flux field orientation loss and operation performance degradation caused by neglecting iron loss in the conventional vector control system, a new vector control strategy based on iron loss model of induction motor (IM) is proposed in this paper. In this strategy, a slip-type indirect field oriented vector control (IFOC) is designed by setting the magnetizing currents...
For a particular five-phase synchronous machine, this paper investigates the sensitivity of a vectorial control strategy on the required peak phase voltage whose value is fundamental for the choice of the DC bus voltage. The specificity of the machine is that the first and third harmonic components of the back electromotive force (back-emf) have the same amplitude. As a consequence, the torque can...
Servo motors are widely used in many industrial applications. These motors require precise control of acceleration, speed, and position. Different designs can be found in the literature. This paper will compare the response of two of the common types and will propose a new servo motor design that uses a smaller amount of magnet, lowering the price of the motor. The proposed motor would be able to...
Recently, there has been interest in using alternative conductor geometries such as Litz wires, transposed conductors, rectangular, and form wound conductors for realizing electric machines to increase the armature current density and thermal performance. Among these, the application of foil conductors has been demonstrated in an axial flux machine and a preliminary study on the AC loss modeling and...
This paper describes the reduction of chattering in functional electrical stimulation (FES) with Smith compensator. We proposed a bilateral controller using FES. In the bilateral controller, in addition to normal remote control, the reaction forces of the distant location are transmitted back to the operator. Therefore, the operator feels like being in the distant location. In controlling of the human...
Control reliability of interior permanent magnet generator (IPMG) depends on accurate knowledge of the generator outputs (torque, currents etc.) and model parameters (resistance, inductances etc.). These outputs and parameters can be obtained by measurements or can be estimated. Reducing measurement equipment, cost of the control system is reduced as well. On the other hand, if control system contains...
Functional electrical stimulation (FES), applied to paralyzed or paretic muscles, can facilitate arm-free standing in patients with neurological disorders. At the same time, it has been shown that the able-bodied central nervous system regulates standing balance using a control strategy similar to proportional-integral-derivative (PID) control. The objective of this study was to investigate the capability...
Interior permanent magnet synchronous machine (IPMSM) has been widely used in traction application due to high efficiency and high power density. Nowadays, in electric vehicle application, the average efficiency over a driving cycle (AEDC) is more attractive than the efficiency over single working point. The paper deals with the design optimization of the average efficiency over a given driving cycle...
In contrast to conventional permanent magnet machines, integrated magnetic gears exhibit different pole pairs in the stator and the rotor. Consequently, a flux modulation of the air gap magnetic field is necessary for torque transmission, wherefore additional flux modulation poles (FMPs) are used. As the number of FMPs adopts to the pole configuration of the stator and the rotor, arbitrary combinations...
Interior permanent magnet synchronous motors (IPMSMs) are used in various applications. Because of concerns about environmental problems such as global warming, IPMSMs are investigated to improve the efficiency to save energy. Magnetic steel sheets are commonly used in IPMSMs, and the use of low-iron-loss materials in IPMSMs to improve their performance has recently been examined. In this study, the...
The output torque of an interior permanent magnet synchronous motor (IPMSM) can be controlled within its allowable range using a pulse-width modulation (PWM) inverter. In this paper, the effect of the load torque on the iron losses of an IPMSM is studied by investigating three driving conditions, namely no-current, no-load and load conditions. The experimental data demonstrates that a torque increase...
A hybrid genetic algorithm (HGA) is proposed to optimize the rotor shape of an Interior permanent magnet machine which is used in EV application. The novel method obtain lower iron loss and torque ripple as well as higher average torque and efficiency for the machine. The optimization results of the HGA design is compared with the initial and genetic algorithm designs. It is shown that the performance...
In this paper, a novel dynamic model of a self-excited induction generator (SEIG) is presented. In the proposed model, the fundamental stray load and iron losses are accounted for in a way that preserves the order of the conventional induction machine (IM) model. The corresponding equivalent resistances are determined from the standard tests. The SEIG has been considered as part of a wind conversion...
Hybrid permanent magnet (PM) variable flux memory (VFM) machines employ both the high coercive force PM, i.e. the constant PM (CPM), and the low coercive force PM, i.e. the variable PM (VPM), with which the PM magnetization state can be flexibly regulated to match various operation requirements. These two kinds of PMs can be magnetically connected with either parallel or series configuration so that...
Nowadays electric tools have been widely used in many fields, such as woodworking, home decoration and mechanical maintenance. Permanent magnet (PM) machine have many merits such as high efficiency, high torque density, and high structural reliability. Due to these advantages, PM machine is suitable for electric tools. Firstly, this paper compares two rotor topology including tangential interior PM...
In this paper, a proposed analytical model is introduced for acceptable optimization of an axial flux permanent magnet (AFPM) machines. Nowadays the finite-element model is one of the most powerful tool to analysis the electrical machine. However, sometimes this method can be very time-consuming for further optimization. Therefore, in this paper, a hybrid analytical model based on sub-domain algorithm...
The influence of different fault modes (open-circuit fault and short-circuit fault) on the post-fault performance of six-phase fault tolerant permanent magnet synchronous motor (FTPMSM) is investigated in this paper. The copper loss of the FTPMSM under different fault modes is calculated in analytical form based on the heat equivalence principle due to the non-sinusoidal waveform of non-fault phase...
An outer-rotor permanent magnet (PM) synchronous machine (OR-PMSM) with amorphous stator core (OR-PMSMASC) is proposed in this paper, which exhibits higher efficiency than conventional silicon steel PM machines. On the basis of the electromagnetic characteristics of the amorphous alloy material (AAM), the general design of the proposed machine is studied, including the structure parameters and the...
This paper focuses on investigating the influence of design parameters on characteristics of external rotor permanent magnet synchronous machine (PMSM). Under the constraint of torque density, the effects of pole number and teeth height ratio on copper and iron losses are studied, as well as motor efficiency and winding temperature rise. Finally, to meet the need of the new micro-EV C11CB by Beijing...
A new and improved technique is presented for the measurement of iron loss in motor stators. The most accurate existing technique rotates dummy-test rotors, one for each field strength of interest, inside the stators to be tested and measures the reaction torque on the stators. The new technique uses a wound ‘rotor’ component that does not rotate mechanically but does rotate electrically. Therefore,...
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