| 摘要 |
Provided is an elevator hoist in which a rotating body is braked by a braking device. The braking device includes: a braking body displaceable in a direction toward and away from the rotating body; a movable body displaced along with the braking body; a urging body for urging the movable body in a direction in which the braking body is brought into contact with the rotating body; and an electromagnetic magnet including an annular electromagnetic coil and a field to which the electromagnetic coil is provided, the electromagnetic magnet being for displacing the movable body in a direction in which the braking body moves away from the rotating body by power feeding to the electromagnetic coil. The field includes: an inner pole portion passing on an inner side of the electromagnetic coil; and an outer pole portion in connection with the inner pole portion, the outer pole portion being provided on an outer side of the electromagnetic coil. The inner pole portion is provided with an inner pole opposed surface opposed to the movable body. The outer pole portion is provided with outer pole opposed surfaces opposed to the movable body. Each of the outer pole opposed surfaces is magnetically saturated with a smaller magnetic flux amount than that for the inner pole opposed surface. Each of the movable body and the field is opposed to a magnetic-flux leaking member for allowing a magnetic flux to avoid the outer pole opposed surfaces and pass between the movable body and the outer pole portion.
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