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The intake of dust and dirt-contained outside air into the motor during the cooling process causes the requirement of dismantling and clean-up operation once every three years. Besides that, high speed of acoustic noise isi produced by the cooling fan mounted on rotor at high speed. totally enclosed, airtight-type motor was developed not only to deal with the dust intake problem and thereby eliminate...
The purpose of this paper is to investigate and implement a novel approach to learning control for permanent magnet synchronous motor (PMSM) drive system using a hybrid recurrent fuzzy neural network (HRFNN) control. First, the field-oriented mechanism is applied to formulate the dynamic equation of the PMSM servo drive. Then, a HRFNN speed control system that combined supervisor control, RFNN and...
This paper proposes a new method of modelling of inductance spatial harmonic components for a position sen-sorless control. The conventional methods for the sensorless control based on mathematical model consider only fundamental components of the inductances. This cause several problems including limited controller's bandwidth. The proposed method is based on the fact that the estimated back electromotive...
This paper introduces a new maximum efficiency operation method of Synchronous Reluctance Machine (SynRM) based on a signal injection. To control SynRM in the maximum efficient operating point, the sum of the copper losses and the iron losses should be minimized. Although many kinds of efficient operating method had been introduced, most of them were dependent upon the machine parameters. The inaccuracy...
This study evaluates the power characteristics of a novel permanent magnet flux switching generator (PMFSG) for a low-speed wind turbine. The PMFSG is an outer-rotor type generator. An induced voltage is generated by the change in the magnetic flux flow when the relative position of the teeth changes. The 2-D finite element method (2D-FEM) is used to analyze the PMFSG. The results reveal that the...
This paper presents a new hybrid sensorless control of interior permanent magnet synchronous machines (IPMSM) for direct drive applications. The control combines both high frequency injection and back EMF based method, and realizes position, speed, and torque control in the entire speed range. Owing to the reliability and the space-saving feature, the sensorless control is applied to direct drive...
The paper proposes a design strategy to reduce torque ripple in interior permanent magnet synchronous motor (IPMSM) with concentrated winding. Authors propose there ideas of design strategy. The first is to choose the combination of poles number and slots number which minimizes the torque ripple. The second is the decision of pole arc angle by trapezoidal waveform approximation of the air-gap magnetic...
This paper presents drive performance possibilities of two types of brushless synchronous machine with wound-field excitation using SMC core for HEV applications. Both proposed machines have no brush or slip ring, but one uses a small amount of rare-earth magnet, it is called as hybrid excitation motor (HEM). The other has no magnet and employs only wound-field excitation. The structures and the basic...
This paper describes a novel power control scheme for a three-phase to single-phase matrix converter for a gas engine cogeneration system. This matrix converter has no dc link but a small capacitor for compensation of single-phase power pulsation. The capacitor also contributes to compensate reactive current of a generator. Additionally, modulation control of instantaneous three-phase power is applied...
Today, interior permanent magnet synchronous machine (IPMSM) is the most important machine for medium and small capacity adjustable-speed drives. It is very important to teach its technology to the university students and the engineers in this field. Six important proposals are suggested. They are the proposals about the definitions concerning the d-axis of dq coordinates and the variable “pole interval...
An improved initial rotor position estimation method based on signal injection for position sensorless interior permanent magnet synchronous motor (PMSM) at standstill is presented. In first step, high-frequency rotating voltage signal is injected into stator wingding to obtain magnetic pole position. A PI tracing observer is used to regulate the error signal containing magnetic pole position information...
Characteristic analysis of a 2MW wind power system with doubly-fed induction generator (DFIG) is carried out. In the analysis, tower shadow effect that occurs in case of downwind turbine remarkably is considered. Tower shadow effect is modeled as a variation of the output power. Stator-field-oriented vector control is applied to the control system in order to compensate the variation. Furthermore,...
A new position-sensorless method has been developed for a permanent magnet synchronous motor (PMSM) drive at low speed. This method utilizes the induced voltage caused by magnetic saturation of PMSM. The rotor position can be detected by using the open phase voltage of a conventional 120-degree commutation. No harmonic injection is needed. This paper discusses the principle of the proposed method...
In this paper, the advanced electric technologies for grid power integration of different offshore wave energy conversion devices are presented. The electrical connection configurations for integrating the electric power of the multi wave energy conversion devices such as the Oscillating Water Column, Pelamis, the Wave Point Absorbers and the Wave Dragon are developed by employing the most efficient...
A sensorless control strategy for a permanent magnet synchronous generator (PMSG) in variable speed wind energy conversion system (WECS) is proposed. The proposed method is based on recursive least square estimation (RLSE) algorithm for rotor speed estimation using an equation containing only stator flux and current. Further, rotor position information used for coordinate transformation is computed...
PM motor drive systems are widely used for industrial drives. However, PM motors basically produce the torque ripple due to the fluctuation of the magnetic field distribution. Dead time of the inverter, offset of sensors and current measurement errors lead to the torque ripple, too. The torque ripple leads vibration noises. In this paper, we proposed a torque ripple suppression method based on perfect...
This paper propose a new current control system for IPMSM to reduce harmonic currents caused by the overmoduration and a non-sinusoidal magnetic flux distribution on the rotor. The harmonic currents have problems with making a current control system of IPMSMs unstable easily. The proposed current control system has two current controllers. One of them controls fundamental current to satisfy the required...
This paper presents a new decoupling method of the radial forces in a dual rotor-type magnetic suspension motor. The dual rotor-type magnetic suspension motor has been proposed by the author, and the motor structure and the principle of the suspension force generation have been introduced. However, it is possible that the mutual interference between the radial suspension forces in two perpendicular...
This paper analyses operation of an indirect rotor field oriented controlled five-phase induction machine with current control in the synchronous reference frame. Artificial Neural network (ANN) based Space vector PWM (SVPWM) technique is utilized to control the five-phase voltage source inverter feeding the five-phase induction machine. Performance, obtainable with ANN based space vector PWM and...
Rare earth permanent magnet (PM) materials are used in interior permanent magnet synchronous motors (IPMSM) as mainstream motors in hybrid electrical vehicles (HEV). In mass produced HEVs, the steep rise of price for the recent rare earth materials like Neodymium, Dysprosium, Boron, and etc is one of serious concerns. Therefore, a switched reluctance motor (SRM) without permanent magnets is one of...
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