Design and evaluation of interior permanent-magnet compressor motors for commercial transcritical CO2 (R-744) heat pump water heaters

Ian P. Brown; Matthew W. Critchley; Jiamin Yin; Stephen B. Memory; Gennadi Y. Sizov; Stefan Elbel; Chad D. Bowers; Michael Petersen; Predrag Stojan Hrnjak

doi:10.1109/TIA.2014.2327158

Design and evaluation of interior permanent-magnet compressor motors for commercial transcritical CO₂ (R-744) heat pump water heaters

Ian P. Brown, Matthew W. Critchley, Jiamin Yin, Stephen B. Memory, Gennadi Y. Sizov, Stefan Elbel, Chad D. Bowers, Michael Petersen, Predrag Stojan Hrnjak

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English (US)
Article number	6823666
Pages (from-to)	576-586
Number of pages	11
Journal	IEEE Transactions on Industry Applications
Volume	51
Issue number	1
DOIs	https://doi.org/10.1109/TIA.2014.2327158
State	Published - Jan 1 2015
Externally published	Yes

Keywords

Heat pump water heaters
Hermetic motors
Interior permanent-magnet machines
Interior permanentmagnet motors
Permanent-magnet machines
Permanent-magnet motors
R-744

ASJC Scopus subject areas

Control and Systems Engineering
Industrial and Manufacturing Engineering
Electrical and Electronic Engineering

Online availability

10.1109/TIA.2014.2327158

Library availability

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Cite this

Brown, I. P., Critchley, M. W., Yin, J., Memory, S. B., Sizov, G. Y., Elbel, S., Bowers, C. D., Petersen, M., & Hrnjak, P. S. (2015). Design and evaluation of interior permanent-magnet compressor motors for commercial transcritical CO₂ (R-744) heat pump water heaters. IEEE Transactions on Industry Applications, 51(1), 576-586. Article 6823666. https://doi.org/10.1109/TIA.2014.2327158

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abstract = "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.",

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