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Title: Steady-state cooling of a high-temperature superconducting motor

Abstract

Development of a high-temperature, superconducting, synchronous motor for large applications (>1000 hp) could offer significant electrical power savings for industrial users. Presently 60% of all electric power generated in the United States is utilized by electric motors. A large part of this power is utilized by motors 1000 hp or larger. The use of high-temperature superconducting materials with critical temperatures above that of liquid nitrogen (77 K) in the field winding would reduce the losses in these motors significantly, and therefore, would have a definite impact on the electrical power usage in the US. These motors will be 1/3 to 1/2 the size of conventional motors of similar power and, thus, offer potential savings in materials and floor space. The cooling of the superconducting materials in the field windings of the rotor presents a unique application of cryogenic engineering. The rotational velocity results in significant radial pressure gradients that affect the flow distribution of the cryogen. The internal pressure fields can result in significant nonuniformities in the two-phase flow of the coolant. A multiphase flow computer model of the cryogenic cooling is developed to calculate the boiling heat transfer and phase distribution of the nitrogen coolant in the motor. Themore » model accounts for unequal phase velocities and nonuniform cooling requirements of the rotor. Model results indicate a factor of 10 difference in the flow through axial coolant channels as a function of radius. The effect of this flow distribution needs to be accounted for in the design of the motor. Continuing improvements on the model will allow the investigation of the transient thermal issues associated with localized quenching of the superconducting components of the motor.« less

Authors:
; ; ; ;  [1]; ; ;  [2]
  1. Sandia National Labs., Albuquerque, NM (United States)
  2. Reliance Electric Co., Cleveland, OH (United States)
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (United States)
Sponsoring Org.:
USDOE; EPRI; USDOE, Washington, DC (United States); Electric Power Research Inst., Palo Alto, CA (United States)
OSTI Identifier:
7172787
Report Number(s):
SAND-92-0216C; CONF-921110-4
ON: DE92012624
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Conference
Resource Relation:
Conference: Winter annual meeting of the American Society of Mechanical Engineers, Anaheim, CA (United States), 8-13 Nov 1992
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; MULTIPHASE FLOW; MATHEMATICAL MODELS; SUPERCONDUCTING MOTORS; COOLING; CRYOGENIC FLUIDS; CRYOGENICS; GASES; HEAT TRANSFER; HIGH-TC SUPERCONDUCTORS; LIQUIDS; NITROGEN; ROTORS; ELECTRIC MOTORS; ELEMENTS; ENERGY TRANSFER; FLUID FLOW; FLUIDS; MOTORS; NONMETALS; SUPERCONDUCTING DEVICES; SUPERCONDUCTORS; 665412* - Superconducting Devices- (1992-); 661210 - Cryogenics- (1992-)

Citation Formats

Dykhuizen, R C, Bickel, T C, Baca, R G, Kempka, S N, Skocypec, R D, Edick, J D, Schiferl, R F, and Jordan, H E. Steady-state cooling of a high-temperature superconducting motor. United States: N. p., 1992. Web.
Dykhuizen, R C, Bickel, T C, Baca, R G, Kempka, S N, Skocypec, R D, Edick, J D, Schiferl, R F, & Jordan, H E. Steady-state cooling of a high-temperature superconducting motor. United States.
Dykhuizen, R C, Bickel, T C, Baca, R G, Kempka, S N, Skocypec, R D, Edick, J D, Schiferl, R F, and Jordan, H E. Wed . "Steady-state cooling of a high-temperature superconducting motor". United States.
@article{osti_7172787,
title = {Steady-state cooling of a high-temperature superconducting motor},
author = {Dykhuizen, R C and Bickel, T C and Baca, R G and Kempka, S N and Skocypec, R D and Edick, J D and Schiferl, R F and Jordan, H E},
abstractNote = {Development of a high-temperature, superconducting, synchronous motor for large applications (>1000 hp) could offer significant electrical power savings for industrial users. Presently 60% of all electric power generated in the United States is utilized by electric motors. A large part of this power is utilized by motors 1000 hp or larger. The use of high-temperature superconducting materials with critical temperatures above that of liquid nitrogen (77 K) in the field winding would reduce the losses in these motors significantly, and therefore, would have a definite impact on the electrical power usage in the US. These motors will be 1/3 to 1/2 the size of conventional motors of similar power and, thus, offer potential savings in materials and floor space. The cooling of the superconducting materials in the field windings of the rotor presents a unique application of cryogenic engineering. The rotational velocity results in significant radial pressure gradients that affect the flow distribution of the cryogen. The internal pressure fields can result in significant nonuniformities in the two-phase flow of the coolant. A multiphase flow computer model of the cryogenic cooling is developed to calculate the boiling heat transfer and phase distribution of the nitrogen coolant in the motor. The model accounts for unequal phase velocities and nonuniform cooling requirements of the rotor. Model results indicate a factor of 10 difference in the flow through axial coolant channels as a function of radius. The effect of this flow distribution needs to be accounted for in the design of the motor. Continuing improvements on the model will allow the investigation of the transient thermal issues associated with localized quenching of the superconducting components of the motor.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

Conference:
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