Electric tool, electric motor and rotor assembly thereof
AssigneeJohnson Electric International AG
InventorsCaiyong Zhang, Jinqiang Ju, Kar Wai Lam
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Abstract
The invention provides a power tool, a motor and a rotor assembly of the motor. The rotor assembly includes a rotating shaft, and a rotor body, a limiting member and a cooling fan fixed on the rotating shaft, the limiting member and the cooling fan are respectively arranged at both axial ends of the rotor body, the rotor body includes a rotor core and magnets fixed in the rotor core, the limiting member and the cooling fan jointly limit an axial displacement and a radial displacement of the magnets.
Claims8
A rotor assembly comprising a rotating shaft, and a rotor body, a limiting member and a cooling fan fixed on the rotating shaft, the limiting member and the cooling fan respectively arranged at both axial ends of the rotor body, the rotor body comprising a rotor core and magnets fixed in the rotor core, wherein the limiting member and the cooling fan jointly limit an axial displacement and a radial displacement of the magnets, and wherein the cooling fan abuts first axial ends of the magnets, the cooling fan comprises protrusions integrally formed therewith and extending towards the rotor body, the protrusions abut the first axial ends of the magnets, the rotor core defines mounting holes for mounting the magnets, and positioning holes respectively communicated with the mounting holes, and further wherein each of the positioning holes is located on a center of a side of a corresponding one of the mounting holes facing the rotating shaft or away from the rotating shaft, the length of each positioning hole is shorter than the length of the corresponding mounting hole in the lengthwise direction of the corresponding mounting hole, the protrusions are at least partially inserted into the positioning holes to abut the magnets.
Dependencies are inferred from the claim text.