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The basic advantage of stepper motors over other types of motors is that it can be driven by digital and open-loop control. However an open loop control shows a poor dynamic performance and is insufficient in precise motions which require a high dynamic, so a closed loop control is required. This paper describes field oriented control which will improve the dynamic performance of the Hybrid stepper...
Because of the higher efficiency, higher power factor, higher power density and better dynamic performance, there is ever increasing attention to applying permanent magnet synchronous motors (PMSM) to traction system. In this paper, the parameter selection of the permanent magnet traction drive motor (PMTDM) was carried out. Some useful conclusion was obtained. At last, a motor design program was...
To meet the need of main drive motor and the low speed high torque requirement of load, a synchronous motor and gear reducer were used .However, they have many serious drawbacks, such as high cost, low transmission efficiency ects. In this paper, a novel structure of motor which the number of slots per pole per phase q is less than 1 was proposed. It can solve the problems in direct drive system and...
The permanent magnet synchronous motor (PMSM) is increasingly playing an important role in alternating current(AC) transmission system. Recently, lots of researches have been investigated for the PMSM system without speed and position sensors. The Vector-control system based on fuzzy self-tuning PID is proposed in this paper. The new algorithm based on fuzzy self-tuning PID can improve the performance...
Firstly, to minimize the ripples of the electric magnetic torque and flux linkage produced in the conventional direct torque control (DTC) system for permanent magnet synchronous motors (PMSM); this paper proposes a expected space vector modulation (ESVM) strategy of DTC. The expected voltage was produced by SVM. PI controller was used in flux and torque controller, instead of hysteresis comparator...
There are big ripples on current and electromagnet torque under traditional hysteresis direct torque control (HDTC) on motor drive system. To solve these problems, a two dimension cloud model controller is designed to instead traditional hysteretic comparator in this paper, and zero voltage vectors are used to further reduce ripples. The torque error, the flux error and stator flux position are used...
The basic requirement for studying starting analysis of Induction motor are the starting current of Induction motor and the voltage flicker during start up. This paper will summarize several common methods and provide application guidelines for proper selection of starting devices. Starting method reviewed will include different types of starters, comparative study of results obtained in laboratory...
This paper describes a hybrid controller combining a Model Reference Fuzzy Controller (MRFC) and Simple fuzzy logic control (FLC) for vector controlled permanent magnet synchronous motor (PMSM) is described. First, an MRFC system is designed to allow the plant states to follow the states produced by a reference model. The input to fuzzy controller is model error, which is the error between reference...
This paper will describe how finite element analysis can be utilize to design and model the performance of rotary electrical machines. Special interest placed on the induction motor since the design is simple, and has greatest influence in operation of electrical power system. Transient AC analysis has been studied as it is necessary to examine the motor's performance dynamically. Opera 2D software...
Direct torque control (DTC) of interior permanent magnet (IPM) synchronous motors is known to deliver fast torque and flux dynamic responses. However, the poor flux estimation at very low speeds has been its largest drawback. A multitude of flux observers have been proposed for flux estimation but most of them fail to fare in the low speed region. This paper proposes a new stator flux observer for...
The growing demand for electricity in developing countries calls for a continuous increase in the installed capacity. However, with installed capacity unable to meet the pace of increase in demand, increase in efficiency of energy conversion devices is a vital requirement. The present paper considers one such energy improvement method in the form of a line start permanent magnet synchronous motor...
Line Start Permanent Magnet Synchronous Motor (LSPMSM) has been proved as an economically feasible, high efficiency alternative to an induction motor where constant speed is desirable. These motors are having the properties of an induction motor during starting and synchronous motor during steady state period. The need of line starting, calls for a cage winding in addition to permanent magnets in...
The parameters of permanent magnet synchronous motors consists of flux leakage coefficient, direct-axis synchronous reactance, quadrature-axis synchronous reactance and the ratio of two synchronous reactance. They all can influence the performance of permanent magnet synchronous motor such as pullout torque, pull in torque and starting torque. The calculated accuracy of the parameters above mentioned...
To satisfy the requirement of the low speed high torque permanent magnet synchronous motor (PMSM) used in the precise numerical control (NC) rotary table, the multipolar PMSM with similar pole number and slot number and unequal teeth structure is designed in this paper. This kind of motors can operate with lower speed, and the structure of similar pole number and slot number can reduce its inherent...
This paper proposes a novel control method that uses current harmonics to minimize torque ripple for permanent magnet synchronous motor (PMSM) applied to electric power steering (EPS) system. In the EPS system, PMSM is accompanied by magnetic saturation of iron core due to high power and limited space. Partial magnetic saturation in the stator teeth results in significant torque ripple. In order to...
This paper deals with design criteria and characteristics analysis included electromagnetic losses analysis of a high-speed permanent magnet synchronous motor for a 7.5-kW, 60-krpm class centrifugal air compressor. In order to design this machine, we introduced analytical techniques, such as the electromagnetic transfer relations theorem and equivalent magnetic circuit method. And, from the curve-fitting...
This paper deals with the core loss reduction according to the change of stator shape in an interior permanent magnet synchronous motor (IPMSM). The number of slots per pole per phase of the IPMSM is 0.5, and the tooth width and yoke thickness are chosen as design factors. According to the ratio of tooth width and yoke thickness, the core loss is analyzed under considering the rotating and alternating...
Recent the electrical machines for electric home appliances require several design points such as compact size, high torque density, high efficiency and noise reduction and so on. In this paper, inner rotor type of IPMSM (interior permanent magnet synchronous motor) is designed focusing on improving efficiency and power factor and reducing cogging torque and size to improve characteristics for washing...
To study the performance of line start permanent magnet motors, this paper investigates two typical rotor designs which have different magnet arrangements, including the interior-magnet rotor and the surface-magnet rotor. The transient and steady states of these motors are calculated by using two-dimensional finite-element analysis. Characteristics such as flux distribution, efficiency, and loading...
Two magnetic fields produce radial force on rotor when the difference of their pole pair numbers is 1. Based on this principle, this paper introduces the bearingless motor with a single set of 5-phase windings. The MMF waveform produced by multiphase windings is analyzed, based on which the winding configuration of 5-phase bearingless motor is introduced. The two needed magnetic fields are produced...
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