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Milwaukee, WI, United States

Hadley B.,University of Florida | Mirafzal B.,University of Florida | Ionel D.,Ao Smith Corporate Technology Center
2010 IEEE Energy Conversion Congress and Exposition, ECCE 2010 - Proceedings | Year: 2010

In this paper, a solar-based hybrid adjustable-speed pump, which has been developed in the laboratory, is used to investigate the power-sharing in hybrid (dual-input) motor-drive systems. The laboratory test setup contains a DC-DC module connected to the DC-bus capacitors of a 2.5hp 230V PWM-based adjustable-speed motor-drive. The experimental results demonstrate that the power-sharing of a Photovoltaic (PV) array/DC-DC converter is not a function of motor speed in hybrid solar-based motor-drives, as long as the power contribution of the AC-grid stays above zero. In these conditions, the PV-DC-DC module behaves like a current source, and the dynamic behavior of the motor is decoupled from the dynamic behavior of the AC-grid, given that the PV-DC- DC module can provide the motor load. © 2010 IEEE. Source


Jin X.,Ao Smith Corporate Technology Center | Ray A.,Pennsylvania State University
International Journal of Control | Year: 2014

In the context of oil spill cleaning by autonomous vehicles in dynamic and uncertain environments, this paper presents a multi-resolution algorithm that seamlessly integrates the concepts of local navigation and global navigation based on the sensory information; the objective here is to enable adaptive decision making and online replanning of vehicle paths. The proposed algorithm provides a complete coverage of the search area for clean-up of the oil spills and does not suffer from the problem of having local minima, which is commonly encountered in potential-field-based methods. The efficacy of the algorithm is tested on a high-fidelity player/stage simulator for oil spill cleaning in a harbour, where the underlying oil weathering process is modelled as 2D random-walk particle tracking. © 2013 Taylor & Francis. Source


Sharma A.,University of Wisconsin - Madison | Zhang C.,CompuTherm LLC | Chang Y.A.,University of Wisconsin - Madison | Knoeppel R.,Ao Smith Corporate Technology Center | Morgan D.,University of Wisconsin - Madison
Corrosion Science | Year: 2011

This work summarizes the experimental literature to date on Al-alloy sacrificial anodes and shows that the presence of Sn as an alloying element in solid solution form consistently debases the alloy corrosion potential. This study then assesses the lattice expander theory, which states that lattice-expanding dopants can be used to increase Sn solubility in Al and thereby reduce passivation. The thermodynamic effects on Sn solubility of lattice expanders (Ga, Mg, Zr, In and Bi) are predicted with ab-initio methods. Our results support lattice expander theory although we demonstrate that Sn solubility can decrease by alloying with even large dopants if they form compounds with Sn. © 2011 Elsevier Ltd. Source


Brown I.P.,Illinois Institute of Technology | Critchley M.W.,Ao Smith Corporate Technology Center | Yin J.,Ao Smith Corporate Technology Center | Memory S.B.,Ao Smith Corporate Technology Center | And 5 more authors.
IEEE Transactions on Industry Applications | Year: 2015

This paper describes the design and experimental evaluation of two high-efficiency interior permanent-magnet (IPM) motors for use in a commercial transcritical CO2 (R-744) heat pump water heater (HPWH). Two IPM topologies, a 36-slot 6-pole topology and a 9-slot 6-pole topology, were selected, optimized, and prototyped using a common flat-bar IPM rotor. The experimental analysis includes standard measurements of electrical machine parameters, and dynamometer tests. The initial measurements of the CO2 compressor performance with a stock line-fed induction machine and the 36-slot 6-pole IPM configuration have been completed. This paper finds a small isentropic compressor efficiency improvement from using the 36-slot 6-pole IPM motor compared to the stock line-fed induction machine at rated operating conditions (essentially constant speed). This paper also expands the open literature on the impact of high-efficiency motor drives on CO2 compressor operation and CO2 HPWH systems. © 1972-2012 IEEE. Source


Brown I.P.,Ao Smith Corporate Technology Center | Critchley M.W.,Ao Smith Corporate Technology Center | Yin J.,Ao Smith Corporate Technology Center | Memory S.B.,Ao Smith Corporate Technology Center | And 5 more authors.
2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012 | Year: 2012

This paper describes the design and experimental evaluation of two high efficiency interior permanent magnet (IPM) motors for use in a commercial transcritical CO2 (R-744) heat pump water heater (HPWH). Two IPM topologies, 36 slot 6 pole and 9 slot 6 pole, were selected, optimized, and prototyped using a common, flat bar interior permanent magnet rotor. The experimental analysis includes standard measurements of electrical machine quantities, and light load dynamometer tests. Initial measurements of the CO2 compressor and HPWH system performance with a stock line fed induction machine have been completed. © 2012 IEEE. Source

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