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Power supplies
Published in David Wyatt, Mike Tooley, Aircraft Electrical and Electronic Systems, 2018
Aircraft electrical power can be derived from a variety of sources; these are categorized as either primary or secondary supplies. Batteries and generators are primary sources of electrical power; inverters and transformer rectifier units (TRUs) are secondary sources of power. This power is either in the form of direct or alternating current depending on system requirements. In addition to onboard equipment, most aircraft have the facility to be connected to an external power source during servicing or maintenance. The basic power source found on most aircraft is the battery, delivering direct current (DC).Generators can supply either direct or alternating current; the outputs of generators need to be regulated. Alternating current generators are also referred to as alternators.
Electrical Aspects
Published in Frank R. Spellman, The Science of Wind Power, 2022
As shown in Figure 8.66, an a-c voltage and current can be produced when a conductor loop rotates through a magnetic field and cuts lines of force to generate an induced a-c voltage across its terminals. This describes the basic principle of operation of an alternating current generator or alternator. An alternator converts mechanical energy into electrical energy. It does this by utilizing the principle of electromagnetic induction. The basic components of an alternator are an armature, about which many turns of conductor are wound, which rotates in a magnetic field, and some means of delivering the resulting alternating current to an external circuit.
Electrical principles
Published in Allan Bonnick, Automotive Science and Mathematics, 2008
In a vehicle alternator (Figure 17.25) the magnet is the rotating member and the coil of wire is the stationary part in which the electrical energy to recharge the battery and operate electrical/electronic systems is generated. The magnetic rotor is driven from the crankshaft pulley and the stationary part – the stator, which contains the coils – is attached to the alternator case.
Regenerative hydraulic shock absorber for vehicle applications: prototype design
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
Vjekoslav Tvrdić, Srdjan Podrug, Damir Jelaska, Milan Perkušić
It is important to note that the selected alternator contains a bridge rectifier and a voltage regulator. The bridge rectifier is an assembly in the selected generator that converts the alternating current (AC) that alternators generate to the direct current (DC) to be used by the vehicle electric battery. A voltage regulator regulates the charging voltage that the alternator produces, keeping it between 13.5 and 14.5 volts to protect the electrical components throughout the vehicle.
Solar coupled Vortex Bladeless Wind Turbine system with BESS in rural electrification
Published in International Journal of Ambient Energy, 2022
Avagaddi Prasad, Proddutur Nagateja, Vivekanandan Subburaj
In VBWT, minimum wind speed is sufficient for generating electric power. The system has wind speed limits that are to be maintained because wind plants require maintenance and protection. Compared to conventional WECS speed, the VBWT speed is efficient. Therefore, wind speed limits are Vmin > V < Vmax can be derived using (1) and (2). It generates electricity to a minimum wind speed of the wind that is 2–3 m per second, and the maximum speed depends on the types of VBWT, and is discussed in Section 2.1. If excess wind generates to protect the total system, damped harmonic oscillator is used and is shown in Figure 2. To avoid external system damages, (i.e) important component in VBWT is mast which needs to be taken care of, and it is very sensitive. Here oscillator plays a important role in safety. The system oscillates with respect to time; and it is directly proportional to the speed of the wind. If the wind speed is more than the limits, system can be protected using the magnetic braking system, and the braking overall design is shown in Figure 4. The alternator cushions and the induced oscillation movement can modify the natural oscillation frequency of the bladeless turbine’s structure, as shown in Figure 3. The alternator converts mechanical energy into AC electrical energy. The oscillation is limited by neodymium magnets, and the stator is fixed inside the turbine. From (3), mass (m) oscillates under a force (F), and it is connected to a spring of elasticity constant (k) and a damper of constant (c). The range of wind velocities within the structure resonates or lock-in a range is narrow because the normal oscillation frequency of a structure is a single one, as shown in Figure 4. where K’ respects the amount of elasticity corresponding to the magnetic repulsion in (4) is the total damping harmonic factor in the Vortex Bladeless Wind Turbine.