TY - GEN
T1 - Electromagnetic shields of the air-core compulsator
AU - Zhao, Weiduo
AU - Cui, Shumei
AU - Wang, Xuejiao
N1 - Publisher Copyright:
© 2014 IEEE.
PY - 2014/10/10
Y1 - 2014/10/10
N2 - Air-core compulsator is a specially designed generator capable of delivering high current pulses to a low-impedance load, such as the electromagnetic railgun. Due to the absence of ferromagnetic material, the field strength in air-core compulsator can reach to 4∼6 T. Therefore electromagnetic shields are required to protect the surrounding operators and instruments from exposure to high magnetic fields. This paper investigates the design methodology of the shield as well as its influence on the performance of the machine. A dynamic model is built to analyze the shielding effect and its performance trade-offs of a reference compulsator. The result indicates that the effect of the eddy current shield is much better than the magnetic shield using ferromagnetic material, due to the high frequency and the magnetic saturations. The magnetic field can be completely screened inside the conducting shield, at expenses of some electrical, mechanical, and thermal performance. Since the eddy current density is sensitive to the location of the shield, the influences of the conducting shield are parametrically analyzed. By using the electromagnetic and thermal coupling field link, the temperature rise of the shield is also calculated. Analysis results can provide the theoretical guides for the shielding of the air-core compulsator investigation in the future.
AB - Air-core compulsator is a specially designed generator capable of delivering high current pulses to a low-impedance load, such as the electromagnetic railgun. Due to the absence of ferromagnetic material, the field strength in air-core compulsator can reach to 4∼6 T. Therefore electromagnetic shields are required to protect the surrounding operators and instruments from exposure to high magnetic fields. This paper investigates the design methodology of the shield as well as its influence on the performance of the machine. A dynamic model is built to analyze the shielding effect and its performance trade-offs of a reference compulsator. The result indicates that the effect of the eddy current shield is much better than the magnetic shield using ferromagnetic material, due to the high frequency and the magnetic saturations. The magnetic field can be completely screened inside the conducting shield, at expenses of some electrical, mechanical, and thermal performance. Since the eddy current density is sensitive to the location of the shield, the influences of the conducting shield are parametrically analyzed. By using the electromagnetic and thermal coupling field link, the temperature rise of the shield is also calculated. Analysis results can provide the theoretical guides for the shielding of the air-core compulsator investigation in the future.
KW - Electromagnetic launch
KW - air-core
KW - compulsator
KW - electromagnetic shields
KW - railgun
UR - http://www.scopus.com/inward/record.url?scp=84909953724&partnerID=8YFLogxK
U2 - 10.1109/EML.2014.6920206
DO - 10.1109/EML.2014.6920206
M3 - Conference contribution
AN - SCOPUS:84909953724
T3 - Conference Proceedings - EML 2014 17th International Symposium on Electromagnetic Launch Technology
BT - Conference Proceedings - EML 2014 17th International Symposium on Electromagnetic Launch Technology
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2014 17th International Symposium on Electromagnetic Launch Technology, EML 2014
Y2 - 7 July 2014 through 11 July 2014
ER -