| 摘要 |
The present invention relates to an asynchronous motor having a squirrel-cage rotor, associated with a brake operating in the absence of current. The rotor comprises, at its two opposite ends, first and second short-circuiting rings and an intermediate short-circuiting ring, all three being made from non-magnetic material and being connected by longitudinal rotor windings. The intermediate ring extends radially from the outer diameter of the rotor as far as a cylindrical recess provided axially between the second ring and the intermediate ring. It is provided in order to separate a part of the rotor, intended to deflect the corresponding part of the radial stator field towards the moveable plate of the brake. This moveable plate has a radial face arranged opposite segments of magnetic material arranged radially between the periphery of the second ring and the outer diameter of the rotor. The second ring extends radially as far as the recess. A spring, housed in the recess, tends to press the movable plate constantly against a fixed plate, by moving it away from the rotor.
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