The utility model discloses a permanent
magnet speed
reducer assembly suitable for a hoisting mechanism of a portal crane. The permanent
magnet speed
reducer assembly comprises a
permanent magnet motor, a two-stage orthogonal shaft gear subassembly and a
brake, the
permanent magnet motor comprises a
permanent magnet motor shell, and a motor
stator and a motor rotor which are arranged in the permanent
magnet motor shell; the two-stage orthogonal shaft gear subassembly comprises a large spiral bevel, an inner spline shaft, a sun gear, a
planet gear, an inner gear ring and an input box body; the large spiral umbrella is arranged on the inner spline shaft and is meshed with the motor rotor through a
tooth part; the inner spline shaft meshes with a sun gear; the
planet gear is respectively meshed with the sun gear and the inner gear ring; the inner gear ring is fixedly connected to the input box body; the
brake is connected with a
tail end shaft body of the motor rotor, and a base of the
brake is provided with a through hole used for being connected with a mounting plane. Compared with the prior art, the permanent magnet motor and
gear transmission system integrated structure is adopted, the heating value is low, the
overall efficiency is improved, parts are reduced, the maintenance cost is reduced, and the
failure rate is reduced.