Gate S.r.l.

Luciano Marchitto

Nicola Re

A rotor of an electric motor has a carrier structure including a disc portion to which is centrally connected a shaft, and the periphery of which is joined to an essentially cylindrical annular skirt portion which in use extends coaxially around the stator. The disc portion has a plurality of slots between which there is defined a corresponding plurality of spokes. At least some of the spokes have, in a circumferential direction, a transverse cross-section shaped in a manner to induce, at least when the rotor rotates in one direction, an at least approximately axial air flow through corresponding slots.

Rotor for electric motor with slots for airflow

A permanent magnet rotor for a brushless electric motor of the kind with an internal stator, has a carrier structure of molded plastic that includes a disc portion fixed to a shaft. The disc portion has a periphery joined to a substantially cylindrical cage portion coaxial with the shaft. The cage portion accommodates a magnetic flux conducting structure forming an wall which is coaxial with the shaft, and a plurality of permanent magnets shaped as ring segments, disposed at angular intervals within and adjacent to the flux conducting structure. Each magnet has its circumferentially terminal faces parallel with each other or converging in the outward direction. The cage portion is overmolded onto the flux conducting structure and has a plurality of angularly spaced struts which are essentially parallel to the axis of the rotor and which protrude radially inwards. Each of the struts having on its flanks respective containment surfaces which are essentially parallel to, or converge in the outward direction with, corresponding facing surfaces of the adjacent struts, such that between the magnetic flux conducting structure and each pair of adjacent struts there is defined a respective seat adapted to snugly receive a respective permanent magnet.

Permanent magnet rotor

A stator connector has an annular carrier structure adapted to be superposed on and fixed to the central annular portion of the stator and manufactured from an electrically insulating plastic overmolded onto a group of N conducting members which are separated from each other and electrically insulated by said plastic and having a generally arcuate shape. The conducting members have respective first projections extending out of the annular carrier structure. These first projections are adapted to be connected, in particular by soldering or welding, to terminals or ends of coils of the stator. Each conducting member further has at least one additional connection projection extending out of the annular carrier structure to form phase terminals for the stator.

Stator connector

A permanent magnet rotor for an brushless electric motor of the kind having an internal stator, has a supporting structure made of molded plastic that includes an essentially disc-shaped portion to which a shaft is centrally connected. The periphery of the disc is joined to an essentially cylindrical cage portion which extends coaxially around the shaft. A plurality of magnetically conductive yokes are disposed in the cage portion. The yokes are shaped as ring segments which as a whole form an essentially cylindrical wall. A plurality of ring segment permanent magnets are each disposed astride the junction of a pair of adjacent yokes. Each yoke has a dimension which increases from the circumferential ends thereof towards its circumferentially intermediate portion, such that the cross-sectional area of the yoke in a radial plane correspondingly increases from the ends thereof towards its intermediate portion.

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Pianezza, Italy

Luciano Marchitto