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Induced back-EMF and phase current of BLDC generator at speed of 1000 rpm at three cases: (a) use of full bridge diode rectifier, (b) use of active rectifier with sinusoidal and (c) trapezoidal reference current.
Source publication
This paper presents a simple and low-cost method to capture maximum power throughput of permanent magnet brushless DC (BLDC) generator. Conventional methods of rectification are based on passive converters, and because the current waveform cannot be controlled as ideal waveform, a highly distorted current is drawn from brushless generator. It leads...
Context in source publication
Context 1
... not involved to produce the power. In the third case, the trapezoidal shape phase currents are produced by BLDC generator using the hysteresis con- trollers. Since, the voltage and current have identical shape, so all harmonic components involve producing the power. The current distortion increases at higher speed for all three cases as shown in Fig. 6 due to more delay caused by induc- tance. The numerical results of BLDCG are summarized in Table 1. At speed of 450 rpm, with trapezoidal current refer- ence, the generator power increases to 6.8% compared to full bridge diode rectifier and at speed of 1000 rpm it increases to 11.6%. At higher speed, the power increment will be more ...
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Citations
... The solution to reduce the cogging torque is the slots skewing, which in turn causes problems with placing the windings in the machine. The main advantage of the PMSG machine is the lack of a mechanical gearbox, which allows for stable generation of electricity at strongly varying wind speeds (Mueller and McDonald, 2009;Apatya et al., 2017;Guo et al., 2011;Niasar and Sabbaghean, 2017;Sakunthala et al., 2017;Errami and Ouassaid, 2011). ...
Purpose
This paper aims to present the project of a permanent magnet synchronous machine which can be used as generator in the vertical axis wind turbine.
Design/methodology/approach
In the study, finite element analysis was used to perform simulation research of electrical machines. Based on the simulation studies, an experimental model was built. The paper presents also selected experimental results.
Findings
During the research, it was found that the radial arrangement of the permanent magnets is more favorable than the tangential one for the selected structure of the generator with permanent magnets.
Research limitations/implications
During the experimental research, a problem was encountered involving the correct control of the constructed generator at low rotational speeds.
Practical implications
The proposed solution can be used in low-speed vertical axis wind turbines.
Social implications
The presented research fits the global trend toward the use of alternative and renewable energy sources.
Originality/value
The paper presents new simulation studies of two low-speed generator topologies. The results for the radial and tangential arrangement of the permanent magnets in the rotor were verified. Based on this research, an experimental prototype of a generator for a slow-speed vertical axis wind turbine was built.
... The commentator converts the alternating current generated into a direct current signal. The drawbacks of this type of generator are the high cost of brushes and commentators and the regular maintenance they need [21], [22]. AC Synchronous: Synchronous generators can take constant signals from permanent -Permanent Magnet Synchronous Generators (PMSG) -or electromagnetic -Electrically Excited Synchronous Generators (EESG) -magnets. ...
Renewable energy sources provide an environmentally friendly solution to contemporary energy needs as a replacement for fossil fuels. Wind energy is one of the leading renewable energy sources for its cleanliness and sustainability. Power transformation devices represent an important factor in power generation from wind power devices. In this work, an asynchronous generator is adapted to accommodate a wind turbine of 5 MW capacity. A complete model for wind turbine mechanical torque and power calculation is presented. The NREL 5 MW wind turbine is used as a case study for validation. The modified Simulink generator tool is tested for the wind turbine model and showed promising results. At the rated wind speed of 11.4 m/s, the present generator model has shown an accuracy of 97.45% compared to the turbine’s nominal power value. This model can be used as a reference for modelling any wind turbine of any capacity using basic wind conditions and design parameters.
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In this paper, the research and development of kinematic characteristics and models of electromechanical tracking drive systems working in slow mode are presented, applied in industrial, civil, national defense and security machines security, using brushless direct current motors (BLDC). On the basis of building simulation models; then evaluate the speed, rotation angle, torque, and current components for this tracking electric drive system. The simulation model was verified on MATLAB/Simulink, experimented with the model to demonstrate the research results. These research results will be the basis for setting up control algorithms and designing tracking electric drive systems in industry, civil and national defense.
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