Motor rotor

Abstract

The invention discloses a motor rotor which comprises a rotor core, an inverted trapezoidal copper conducting bar, an outer aluminum conducting bar and an inner aluminum conducting bar. The structure of the motor rotor is characterized in that the rotor core is formed by laminating rotor punching sheets; an outer groove, a middle groove and an inner groove are annually distributed on the outer side of the circumference of the rotor punching sheet; the rotor punching sheets are stacked together to form an outer conducting bar hole, a middle conducting bar hole and an inner conducting bar hole in the rotor core; the inverted trapezoidal copper conducting bar is inserted into the middle conducting bar hole, the outer aluminum conducting bar is casted in the outer conducting bar hole, the inner aluminum conducting bar is casted in the inner conducting bar hole, aluminum end rings are casted on both ends of the rotor core and are provided with aluminum fan blades and aluminum balance columns; the outer aluminum conducting bar, the inner aluminum conducting bar, the aluminum end rings, the aluminum fan blades and the aluminum balance columns are integrally formed and are manufactured via a cast process. The motor rotor is higher in motor efficiency than a cast-aluminum structured rotor, improves copper bar shake and a sealing-off phenomenon compared with an inserted-copper-bar structure, is simpler in process and lower in cost than a cast-copper structure rotor, and has excellent locked-rotor performance of cast-aluminum rotors and double-cage rotors.

Description

technical field [0001] The invention relates to a motor component, in particular to a motor rotor. Background technique [0002] There are three common rotor structures for electric motors: [0003] 1. The rotor with cast aluminum structure, aluminum is cast into the guide bar holes of the rotor core to form aluminum guide bars, and at the same time, aluminum end rings, aluminum fan blades and aluminum balance columns are cast at both ends of the rotor core. This structure is used in small and medium-sized motors very common. Because the resistivity of aluminum is higher than that of copper, the loss is high, and it is difficult to guarantee the efficiency level of the motor to reach the level of ultra-high efficiency and ultra-ultra-high efficiency. [0004] 2. For the rotor with copper bar structure, insert the copper guide bar into the guide bar hole of the rotor core. The copper guide bar is longer than the rotor core, and the copper guide bar is welded to the copper e...

AI Technical Summary

Problems solved by technology

The copper casting process is complex, difficult, short mold life, and high cost. At present, it is used in the manufacture of motors below the H200 frame size in China; the cast copper rotor does not have fan blades, which affects heat dissipation; the cast copper rotor does not have balance columns, which affects Calibration rotor balance

[0006] In addition, due to the low resistivity of the copper rotor, the loss is low, and the efficiency of the motor is high, but the stall performance is reduced

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