نتایج جستجو برای: static magnet
تعداد نتایج: 127277 فیلتر نتایج به سال:
This work describes the main consideration in the design of power converter for a SRM drive with the particular attention to the choice of converter topology, and to study and develop the static and dynamic characteristics of the prototype model of SRM using FEA software (MagNet 6. 22). To simulate the power converter switching circuit for prototype model of SRM using MATLAB/Simulink 7. 8. 0. I...
Methods Individuals with moderate to severe migraine were recruited from specialty clinics, family practices, and the university community. After confirmatory clinical evaluation and an 8-week run-in phase, those meeting study criteria (compliant with study procedures, at least 5 migraines per month) were randomized to 8 weekly CST or low-strength static magnet therapy (LSSM) treatments. Study ...
When a momentary large current in opposite directions flows through the two opposing spiral coils, strong magnetic field is generated coils. The creates an impact force between permanent magnet placed under of actuator enhanced because Lorentz by static field. In this paper, we introduce principle electromagnetic generation and calculation method force. fields coil are analyzed finite element m...
هدف این پروژه تهیه نرم افزار مدرنema-cad (automatic computer aided design of electrical machines) جهت طراحی اتوماتیک ماشینهای گردان می باشد. در این پروژه نحوه طراحی و آنالیز موتورهای القایی، سوییچ رلوکتانس، سنکرون مغناطیس دایم سطحی و جریان مستقیم ارایه گردیده است. این برنامه بر مدلسازی و آنالیز تحلیلی ماشینهای الکتریکی استوار است و نسبت به روش های عددی مانند روش اجزاء محدود، دارای سرعت بسیار بی...
This paper presented an improved analytical method for calculating the open-circuit magnetic field in the surface-mounted permanent magnet machines accounting for slots and eccentric magnet pole. Magnetic field produced by radial and parallel permanent magnet is equivalent to that produced by surface current according to equivalent surface-current method of permanent magnet. The model is divide...
This paper analyzed the effect of temperature on the permanent magnet flux and output torque. The major parameter which will impact the torque control accuracy of a surface mounted permanent magnet motor is the variation of the permanent magnet temperature. In addition, the temperature variation of the permanent magnet will also influence the maximum torque per ampere of the motor. To analyze t...
in this paper, the optimal design of a three phase surface mounted permanent magnet synchronous motor has been done by particle swarm optimization and bees algorithm. this machine has been designed for high speed applications, and an epoxy and glass fiber bandage is used for permanent magnet protection against centrifugal forces. the optimization has been done by new design equations to improve...
The Gyro centrifugal pump, developed as a totally implantable artificial heart, was designed with a free impeller in which the rotational shaft (male bearing) of the impeller was completely separated from the female bearing. For this type of pump, it is very important to keep the proper magnet balance (impeller-magnet and actuator-magnet balance) to prevent thrombus formation or bearing wear. W...
The relationships between hospital Magnet® status, nursing unit staffing, and patient falls were examined in a cross-sectional study using 2004 National Database of Nursing Quality Indicators (NDNQI®) data from 5,388 units in 108 Magnet and 528 non-Magnet hospitals. In multivariate models, the fall rate was 5% lower in Magnet than non-Magnet hospitals. An additional registered nurse (RN) hour p...
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