| 摘要 |
A magnetic resistance type exercise unit includes a frame assembly, a first rotating shaft journaled on the frame assembly, a rope sheave rotatably actuating the first rotating shaft, a rope wound around the rope sheave and having one end secured to the rope sheave, a handle secured to the other end of the rope so as to rotate the rope sheave by pulling the rope away from the rope sheave, a spiral spring connected to the rope sheave to rewind the rope about the rope sheave, a second rotating shaft journaled on the frame assembly and rotated by the first rotating shaft, a rotary plate rigidly sleeved on the second rotating shaft and made of an electrical conducting material, and a permanent magnet member mounted on the frame assembly adjacent to the rotary plate and having a pair of oppositely polarized and aligned ends disposed on opposite sides of the rotary plate. When in use, the rotary plate cuts into a nonuniform magnetic field caused by the permanent magnet member to thereby induce eddy currents in the rotary plate. The eddy currents induced in the rotary plate generate a retarding force that opposes the motion of the rotary plate through the magnetic field.
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