Abstract The torque calculating of magnetic coupling of the heavy still bottoms gear is difficult because of 3 dimensions fields and the complex final conditions added the leakage and tolerant of materials performance． It derived the torque formulary of the coupling by analyzing and conrformed by experiment·It also gave the ration of length and diameter of the permanent magnet L/D=2/3~1，and the thick of conductor radial t=(1.5~2)L by similar principle．It can be reference in magnetic coupling designing．
YANG Feng-Yu, YU You-Ling. Torque calculating of m agnetic coupling
of heavy still bottoms gear pump. Chinese Journal of Engineering Design, 2003, 10(1): 52-54.
