Permanent magnet electric motor
OwnerEnrique Almadainventor
Life of this patent
Estimating the term…
Abstract
A permanent magnet electric motor for use in an elevator installation includes a stator and a rotor assembly. The rotor assembly has a frame on which are mounted at least two rings with permanent magnets. The rings are removably mounted and are laterally fixed together by a fastener that also radially aligns the rings. The number of similar rings used defines a rotor length in multiple values of the ring length. The rings can be shifted by a suitable magnetic angle to permit the generation of a skewing effect of the magnets which reduces or eliminates a cogging torque of the motor. The rotor assembly can be easily and quickly installed and/or removed in very small spaces, especially in elevator installations.
Claims13
A permanent magnet electric machine comprising:
- an armature;
- and
- an inductor having at least two rings with a plurality of permanent magnets fixed on one of an outer surface and an inner surface of each of said rings, said inductor having a frame with said rings being removably mounted on said frame and said rings being laterally fastened together by a locking means.
A permanent magnet electric driving machine for an elevator installation comprising:
- an armature having windings;
- an inductor assembly having a frame with at least two rings with permanent magnets mounted thereon;
- and
- a fastening means removably fixing said rings on said frame whereby said armature and said inductor assembly are mounted to rotate relative to one another to operate as a synchronous electric motor.
Dependencies are inferred from the claim text.