4results about How to "Reduce cogging torque" patented technology

This invention relates to the field of electric motors, and more particularly to an electric motor rotor. The electric motor rotor includes: a trapezoidal slot formed on the outer circumferential surface of the motor rotor, the trapezoidal slot having a base edge; a magnet slot, the axis of symmetry of the magnet slot passing through the center of the inner diameter of the motor rotor, the trapezoidal slot being formed on at least one side of the axis of symmetry of the magnet slot, the magnet slot having a first side line; and a magnetic stabilizing hole formed between the outer circumferential surface of the motor rotor and the magnet slot, the longitudinal axis of the magnetic stabilizing hole being perpendicular to the first side line, the magnetic stabilizing hole and the trapezoidal slot being on the same side of the axis of symmetry of the magnet slot, the axis of symmetry of the trapezoidal slot passing through the center of the inner diameter of the motor rotor, an angle α1 between the longitudinal axis of the magnetic stabilizing hole and the axis of symmetry of the trapezoidal slot, and an angle α2 between the longitudinal axis of the magnetic stabilizing hole and the axis of symmetry of the magnet slot, α1 and α2 satisfying 0.701≤(α1-α2) / α1≤0.958. This invention also relates to an electric motor. This invention can effectively reduce the no-load back EMF harmonics of the motor, improving motor efficiency and operational smoothness.

This application discloses a method for assembling a staggered rotor of a permanent magnet motor and a staggered rotor. The method includes: Step S1: machining a first keyway circumferentially on the rotor shaft; Step S2: fabricating three rotor core segments using stacked silicon steel sheets, machining positioning teeth and a second keyway on the outer and inner circumferences of each rotor core segment, with a preset angle relationship between the positioning teeth of the three rotor core segments; Step S3: embedding a flat key into the first keyway of the rotor shaft, and sequentially assembling the three rotor core segments along the setting direction of the flat key so that the second keyway fits into the flat key; Step S4: installing magnets at the positioning teeth of each rotor core segment, and bonding and fixing the magnets to the rotor core using anaerobic adhesive; Step S5: installing magnet end caps on the ends of the rotor cores, cooperating with the rotor shaft to complete the axial fixation of the rotor cores, then fitting a protective sleeve and performing a closing treatment to complete the overall assembly of the staggered rotor. This application achieves precise control of the staggered angle, simplification and efficiency of the assembly process, and reliable protection for magnet fixation.

The utility model discloses a kind of motor, compressor and refrigeration equipment, it is related to motor technical field, wherein, the motor includes stator and rotor, rotor is provided with magnetic steel slot group along circumference, it is equipped with magnet group, each magnet group includes intermediate magnet and the two side magnets of setting in the two sides of intermediate magnet;Two side magnets are mirror symmetry about the magnetic pole center line of the magnetic steel slot group;Two notches are set to each magnetic steel slot group in the radial outer edge of rotor, the included angle α between side magnet and intermediate magnet;The included angle of notch edge and the magnetic pole center line of the magnetic steel slot group is β, the minimum spacing between two notches is X;The length of intermediate magnet along the direction perpendicular to magnetic pole center line is L, satisfy relationship: 0.7≤(α-90°) / β≤1,1.6≤X / L≤2.3, wherein, α>90°.The technical scheme provided by the utility model aims at improving the torque ripple and cogging torque of permanent magnet motor, improving motor efficiency, and then solving the problem of high vibration noise and life attenuation of compressor.

The invention discloses a rotor punching sheet, a rotor core and a motor, the rotor punching sheet comprises a punching sheet body, the inner side of the punching sheet body is provided with a plurality of linear magnetic steel grooves distributed along the circumferential direction, and the periphery of the punching sheet body is provided with concave edges recessed towards the center of the punching sheet body at positions corresponding to the magnetic steel grooves; wherein the concave edge is formed by connecting a section of semi-elliptic arc edge and two sections of broken line edges, the short axis of the semi-elliptic arc edge coincides with the d axis of the motor, and the two sections of broken line edges are connected to the two ends of the semi-elliptic arc edge respectively and are symmetrical about the d axis of the motor. According to the rotor punching sheet, the peripheral contour is designed to be of a special concave edge structure, the cogging torque and counter electromotive force distortion problem of the permanent magnet synchronous motor can be solved, and therefore the comprehensive performance and applicability of the motor are improved.