TY - JOUR
T1 - Feasible homopolar dynamo with sliding liquid-metal contacts
AU - Priede, Janis
AU - Avalos-Zúñiga, Raúl
N1 - Funding Information:
R.A.-Z. is grateful to the National Council for Science and Technology of Mexico (CONACYT) for funding the projects CB-168850 & 131399 .
PY - 2013/11/1
Y1 - 2013/11/1
N2 - We present a feasible homopolar dynamo design consisting of a flat, multi-arm spiral coil, which is placed above a fast-spinning metal ring and connected to the latter by sliding liquid-metal electrical contacts. Using a simple, analytically solvable axisymmetric model, we determine the optimal design of such a setup. For small contact resistance, the lowest magnetic Reynolds number, Rm≈34.6, at which the dynamo can work, is attained at the optimal ratio of the outer and inner radii of the rings Ri/ Ro≈0.36 and the spiral pitch angle 54.7. In a setup of two copper rings with the thickness of 3 cm, Ri=10 cm and Ro=30 cm, self-excitation of the magnetic field is expected at a critical rotation frequency around 10 Hz.
AB - We present a feasible homopolar dynamo design consisting of a flat, multi-arm spiral coil, which is placed above a fast-spinning metal ring and connected to the latter by sliding liquid-metal electrical contacts. Using a simple, analytically solvable axisymmetric model, we determine the optimal design of such a setup. For small contact resistance, the lowest magnetic Reynolds number, Rm≈34.6, at which the dynamo can work, is attained at the optimal ratio of the outer and inner radii of the rings Ri/ Ro≈0.36 and the spiral pitch angle 54.7. In a setup of two copper rings with the thickness of 3 cm, Ri=10 cm and Ro=30 cm, self-excitation of the magnetic field is expected at a critical rotation frequency around 10 Hz.
KW - Homopolar dynamo
KW - Liquid metal
KW - Sliding contacts
UR - http://www.scopus.com/inward/record.url?scp=84880295525&partnerID=8YFLogxK
U2 - 10.1016/j.physleta.2013.06.007
DO - 10.1016/j.physleta.2013.06.007
M3 - Artículo
SN - 0375-9601
VL - 377
SP - 2093
EP - 2096
JO - Physics Letters, Section A: General, Atomic and Solid State Physics
JF - Physics Letters, Section A: General, Atomic and Solid State Physics
IS - 34-36
ER -