| 摘要 |
PROBLEM TO BE SOLVED: To inhibit drag torque that is generated, when braking is turned off, without losing the braking force when braking is on. SOLUTION: The eddy current type deceleration device is in a single-row turning system. A support ring 2 is divided into two portions in the radial direction, so that the sectional area of the support ring 2 between adjacent permanent magnets 3 is large at braking, and the support ring 2 between the adjacent permanent magnets 3 is small at non-braking. The braking force when damping is on is not impaired, thus inhibiting magnetic flux that is generated from the permanent magnets when braking is off, to necessarily decrease the magnetic flux which leaked to the cylindrical section of a rotor from a switch board, accompanied by the decrease in the magnetic flux that is generated from the permanent magnets when braking is off, and inhibiting drag torque.
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