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Investigation of linear generator starting modes by mechanical resonance and rectangular current commutation

M.N., Karsiti and A.R.A., Aziz and S.A., Zulkifli (2009) Investigation of linear generator starting modes by mechanical resonance and rectangular current commutation. In: 2009 IEEE International Electric Machines and Drives Conference, IEMDC '09, 3 May 2009 through 6 May 2009, Miami, FL.

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Abstract

Starting a free-piston linear engine-generator (LG) requires favorable compression pressure and piston speed for combustion to occur. To produce the required reciprocating motion, the LG is operated as a brushless linear motor. However, the peak force required to achieve the full stroke is beyond the maximum motor force that can be produced, limited by the coils' current capacity and LG's motor constant. A starting method is proposed, utilizing mechanical resonance and the air-spring character of engine cylinders prior to combustion. Energizing the coils with fixed DC bus voltage and open-loop, rectangular current commutation, the LG is reciprocated in small amplitudes initially. Due to repeated compression-expansion of the engine cylinders and constant application of motoring force in the direction of natural resonating motion, the translator's amplitude and speed is expected to grow and reach the final required values for combustion. To investigate viability of the proposed strategy, an integrated model of LG - consisting of mechanical and electrical subsystems - is developed and real-time simulation is performed on Matlab Simulink. The individual models are validated against field experimentation before final simulation and experimentation are implemented. This work discusses simulation and experimental results of the proposed starting strategy. © 2009 IEEE.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Compression pressures; Compression-expansion; Current capacity; Current commutation; DC-bus voltages; Electrical subsystems; Engine-generator; Field experimentation; Free piston; Individual models; Integrated models; Linear generators; Matlab-Simulink; Mechanical resonance; Motor constant; Open loops; Peak force; Real time simulations; Reciprocating motion; Small amplitude; Starting methods; Starting mode; Combustion; Cylinders (shapes); Electric commutation; Electric drives; Electric machinery; Engine pistons; MATLAB; Motors; Resonance; Simulators; Smoke; Engine cylinders
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments / MOR / COE:Departments > Electrical & Electronic Engineering
ID Code:463
Deposited By: Assoc Prof Dr Mohd Noh Karsiti
Deposited On:09 Mar 2010 02:01
Last Modified:19 Jan 2017 08:25

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