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US 3,939,370 AGranted
Variable speed three-phase motor
OwnerArnold Mullerinventor
Life of this patent
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Abstract
The disclosure is of a variable speed three-phase motor with a intermediate rotor and inner rotor, where the pack of laminations of the main rotor is prolonged as an annular pack of laminations in the direction of the longitudinal axis with short-circuit rods extending over the whole length of the stator, thereby forming an annular intermediate rotor inside which the inner rotor with its short-circuit rods rotates.
Claims3
A variable speed three-phase short-circuit motor comprising:
- a central drive output shaft defining the longitudinal axis of the motor;
- a main rotor of the short-circuit cage type, fixedly mounted on the output shaft for rotation therewith;
- a hollow intermediate rotor axially adjoining the main rotor as an extension of its short-circuit cage, thereby forming a continuous outer rotor surface therewith, the intermediate rotor being thus solidary with the main rotor and disposed coaxially with respect to the output shaft to form a cavity that is concentric with respect to the motor axis;
- an inner short-circuit rotor arranged inside said cavity so as to cooperate with the surrounding intermediate rotor;
- a secondary shaft arranged coaxially with the drive output shaft on the side of the intermediate rotor and inner rotor, said secondary shaft carrying the inner rotor for rotation independent of the drive output shaft;
- and
- a stator surrounding both the main rotor and the intermediate rotor for dynamoelectric cooperation therewith.
4 more elements
Dependencies are inferred from the claim text.