The components of a micro electric hoist include: motor, transmission mechanism, drum, and sprocket.

(1) The electric hoist with the motor axis perpendicular to the drum axis adopts a worm gear transmission device, which has a large width, bulky structure, low mechanical efficiency, and difficult processing. At present, there are no manufacturers producing products with this structural type.

(2) The electric hoist with the motor axis parallel to the drum axis has the advantage of small height and length dimensions. Its disadvantages include large width dimensions, grouping, and complex manufacturing and assembly. The turning radius of the track is large.

(3) The electric hoist with the motor installed inside the drum has the advantages of small length and compact structure. Its main disadvantages are poor motor heat dissipation conditions, poor grouping, inconvenient inspection, installation, and maintenance of motors, and complex power supply devices.

(4) The electric hoist with the motor installed outside the wire rope drum has the advantages of good grouping, high universality, easy change of lifting height, and convenient installation and maintenance. Its disadvantage is that it has a large length dimension.