Motor for driving a container-holder plate in a labelling machine

A rotary labeling machine comprising a carousel supporting a plurality of motor-plate units along the periphery thereof, wherein said motor plate units are connected to said carousel, each said motor-plate unit comprising a motor and a container-holder plate suitable to support a container to be labeled, said motor comprising:

• a housing having connecting portions for connecting the motor to a carrousel of the labeling machine, the connecting portions having connecting holes;
• a stator fixed within the housing;
• a motor shaft supported for rotation within the housing;
• a rotor connected to the motor shaft;
• and
• a coupling flange having coupling seats for connection with the container-holder plate, wherein:
• said motor shaft and said coupling flange are formed as a single piece such as to form a single body shaft-flange unit and said coupling seats comprise a plurality of coupling holes directly formed in said single body shaft-flange unit and housing coupling screws in contact both with the shaft-flange unit and the plate to directly connect the plate to the shaft-flange unit;
• an annular gap is formed between the stator and the rotor, the annular gap having a larger average diameter than the diameter of a circle on which the coupling holes of the coupling seats are arranged;
• and
• the annular gap has a smaller average diameter than the diameter of a circle on which the connecting holes of the connecting portions are arranged,
• wherein said motor defines a through opening to allow alignment means or other accessories of the labeling machine access to the container-holder plate through the motor.