Lundell generator (alternator). Increasing comfort and safety in cars, trucks, and buses driven by combustion engines require more installed. PDF | Due to the increasing power demands in automotive applications, the conventional power generator (Lundell alternator) is rapidly reaching its limits. Abstract—Thermal analysis of Lundell alternators used in automobiles is presented. An analytical thermal model for Lun- dell alternators is proposed, and .
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The simulation slightly overestimates the output current particularly alternxtor the central part of the curve. To reduce magnetic losses in the rotor, it is possible to use a laminated material but the assembly process is more complex Bretta, Select a Web Site Choose a web site to get translated content where available and see local events and offers. Conversely, a nonlinear field model could be used.
Every car has it – The Lundell generator with claw-pole rotor
The rectifier has been taken out from the machine and the voltage regulator has been removed so that the excitation current could be imposed using an external current source. During high speed operation, it is preferable to operate in synchronous rectification mode. Larger vehicles may have salient pole alternators similar to larger machines. No output power is required below the lundrll speed. In order to minimize the magnetic coupling, the first 3-phase winding is wound using half stator 18 slots and the second 3-phase winding using allternator other half.
Another way is to rewind the alternator with a lower number of turns and to replace the conventional diode rectifier by an active PWM rectifier. Winding reconfiguration is an interesting approach to improve output power, efficiency and satisfy idle current specifications. Starting in the model year, Ford upgraded the Model T to include an electric starter, which was standard for some models and optional for others.
Field winding inductance, lundeell H.
It is faster than a step by step simulation method as employed by simulators for power electronics PSIM, Saber and it is well adapted for a,ternator within an optimization loop for system evaluation purposes. Windage, Kw — Windage scalar.
Automobile emissions control Catalytic converter Diesel particulate filter Exhaust manifold Glasspack Muffler. Unfortunately the magnetic losses will also increase due to the higher electrical frequency. Q1 and Q2 are driven by two signals having the same duty-cycle and the same frequency but the phase is shifted by degrees.
Diode voltage drop, in V. Equation 5 gives the optimal duty-cycle for a number m of interleaved rectifiers where k i is an integer. The mechanical losses increase considerably at higher speeds Bosch, This section focuses on various possible solutions to increase the output power of Lundell alternators without any geometry modification.
Power Electronic Solutions to Improve the Performance of Lundell Automotive Alternators
In both modes of operation the switching losses will be much lower alternagor PWM converters due to lower lunfell frequency.
AltVolt — Alternator output voltage scalar. Battery age plays an important role in voltage regulation.
It is assumed that the machine cost is not affected by rewinding and the filter size is proportional to the AC ripple component of the output current. The analytical method based on the reluctance network is fast due to its simplifying assumptions.
The Model T incorporated its magneto into the engine flywheel. A series connection provides the same output current as the original alternator, during low-speed operation when diode voltage drop is neglected. They are lighter, cheaper, more rugged, and can provide useful charge at idle speed. With two oversized shaft bearings as the only wearing parts, these can provide extremely long and reliable service, even exceeding the engine overhaul intervals.
As shown in Fig.
Table 3 shows the parts count and their ratings for each topology. Dave Jan 25, The same experimental set-up will allow the comparison of various converter topologies and winding configurations for alternators. The stator winding with the highest number of turns halves the speed of the generation starting point but it produces twice less output current during high-speed operation. In order to evaluate the performance of the alternator under variable load conditions, both the machine and rectifier systems shall be modeled with appropriate magnetic and electrical models.