Rotor Permanent Magnet Synchronous Generator Research Articles

Design and fabrication of an outer rotor permanent magnet synchronous generator with fractional winding for micro‐wind turbines

Permanent magnet synchronous generators (PMSGs) have been widely used in micro-wind turbines (MWTs) for direct-drive applications. The generating maximum power from the PMSGs used in the MWTs is desired. However, cogging torque (CT) and design form of the PMSGs prevent this. Therefore, various methods are applied to reduce the CT of PMSGs in the literature. Some of them are inapplicable and some are the ones that cause power loss. In this study, to overcome the expressed causes, a new design, fabrication, and application of an outer rotor PMSG with fractional winding having a slot–pole combination technique for MWTs have been suggested, designed, and implemented on an MWT. As a result of the new design combination of ±1 or ±2 between the numbers of stator slot (N S) and the number of pole-pairs (2p), the ratio of the CT value to the nominal torque value in the new prototyped outer rotor PMSG was found as 6.25%. Finally, the operating power can generate 1029 W through the prototype PMSG with fractional winding having a slot–pole combination technique integrated into the direct-drive MWT system.

Waterway design of an external rotor permanent magnet synchronous generator

An external rotor permanent magnet synchronous generator (ERPMSG) model for Range-Extended Electric Vehicles is developed. The temperature field simulation model of the ERPMSG is established. Experimental test of the winding temperature shows that the simulation model is believable and then it is used to optimize the structural parameters of the cooling water channel. It is found that the pressure loss increases with the number of layers of the cooling water channel increasing and the width of the water channel decreasing. In order to obtain a large turbulent effect and a minimum pressure loss simultaneously, the number of layers of the cooling water channel is set to be 3 and the width of the waterway 8 mm. The corner of the water channel is designed round with an optimum radius of 20 mm. After optimization, the cooling performance of the ERPMSG is obviously improved. Compared with the ERPMSG before optimization, the temperature of the ERPMSG with optimum structure parameters of the cooling water channel is lower. The maximum temperatures of the winding, the stator core and the rotor of the ERPMSG with optimum structure parameters of the cooling water channel decrease 8.19 °C, 5 °C and 7.42 °C respectively. Temperature distribution is more uniform in the permanent magnet of the ERPMSM with waterway structure optimization.

Transient analysis with coupled field-circuit model and experimental assessment of a PMSG used in small-scale wind turbine for water heating purpose

This paper introduces the detailed coupled field-circuit analysis including performance characteristics of a 4-kW in-running rotor permanent magnet synchronous generator (PMSG) used in rural-type small-scale wind turbines for water heating purpose. The content of the work consists of design, analysis, optimization, production and testing processes and validation studies. An integrated 2D electromagnetic field and circuit model are used in the design and analysis processes. The electrical machine design involves complex and time-consuming processes. This model provides comprehensive information on machine behavior under different conditions and is an effective to demonstrate compliance with real load conditions prior to the manufacture. The goal of the optimization process is to find a design that offers cost, manufacturability and efficiency as well as generator output values. For this, a multiobjective optimization approach has been used. Typical design and simulation principles are applied to the designed PMSG, respectively, including calculation and evaluation of various output parameters for different simulated wind speed rates and varying load conditions. Furthermore, the analytical studies related to finite element methods and parametric approaches are presented in collaboration with experimental studies carried out for different load rates.

A comparative design study and analysis of inner and outer rotor permanent magnet synchronous machine for power generation in vertical axis wind turbine using GSA and GSA-PSO

In wind energy conversion system, an electric generator is coupled with a wind turbine. The wind turbine is either vertical axis or horizontal axis wind turbine. To increase the efficiency the gear driven generator has been replaced by directly driven generator. This paper recounts the design optimization of inner and outer rotor permanent magnet synchronous machine of rating 500KVA, 3.3kV, 3-phase, and 600rpm. The weight of the generator has been taken as an objective function. The gravitational search algorithm and its hybridization with particle swarm optimization have been used as tools for optimization. The temperature rise, efficiency, regulation and maximum flux density in stator teeth are taken as constraints for design problem. The results of both types of generator configurations are obtained and compared. It is found that the efficiency of outer rotor permanent magnet synchronous generator is improved by 2.19% and regulation by 2.83% as compared to inner rotor permanent magnet synchronous generator. Lower temperature rise as 22.61°C is observed for outer rotor permanent magnet synchronous generator whereas it is 31.18°C in case of outer rotor permanent magnet synchronous machine. Further, the sensitivity analysis has been performed over design parameters using local sensitivity method for both generators.

Strategies for Improving Voltage Waveform of an Outer Rotor PMSG: No-Load Prototype Testing

This paper deals with the design and no load test of an outer rotor Permanent Magnet Synchronous Generator (PMSG). For this purpose, many analyses were made to identify which modification of the geometrical parameters help us to improve the voltage waveform in winding terminals of the generator. Tests results complements previous works where were presented analysis of this 5 kW PMSG. The Total Harmonic Distortion (THD) is analyzed, under design parameters handling, i.e., the geometry of the stator, the polar arc percentage, the air gap, the skew angle in rotor poles, the pole length and the core steel class. Seventy-six cases are simulated and the results provide useful information for designing these machines. Tests on machine help us to verify the electromagnetic analysis. Finally, some important stages of the generator building process are shown.

Modification of Geometric Parameters in Outer Rotor Permanent Magnet Generators to Improve THD, Efficiency, and Cogging Torque

Abstract The improvement of efficiency, total harmonic distortion (THD), and cogging torque in outer rotor permanent magnet synchronous generator (PMSG) is the main concern in this paper. The paper focuses on handling the parameters of design, i.e. the geometry of the stator, the polar arc percentage, the air gap, the skew angle in rotor poles, the pole length, and the core steel class. The modification of geometric parameters related to the stator’s inductance is analyzed. Seventy-six cases are simulated, and results provide useful information for designing this type of machines. The study is carried out in a 5 kW PMSG.

Design of a Permanent Magnet Synchronous Generator for Vehicle Application

This paper discusses the design, fabrication and testing of a centrifugal rotor permanent magnet synchronous generator. The roller of the engine and the shell of the centrifugal outer rotor of the generator are designed together. The permanent material and the fixing block are fixed on the shell of the outer rotor. the centrifugal force increase with the rotate speed increase, so, the permanent material will not be damaged at high speed, and the reliability of the generator is improved. When the rotor turns, the magnet field turns, the generator generates electricity,with the permanent magnet material of high remnant magnetic induction and the optimized design of the generator, the output voltage is improved when the engine at low speed. We develope a single-phase double half-wave electric regulator is to ensure the stability of the output voltage and can direct output direct current.