High-power density permanent magnet servo motor and stator structure therefor

Abstract

The invention relates to a stator structure of a high power density motor, comprising a stator tooth core, a stator yoke core and a winding, the stator tooth core is wound with the winding, and is connected with the stator yoke iron The cores are spliced ​​and connected, and filled with a filler in a vacuum and high pressure environment; after splicing, the head end of the stator tooth core forms a ring with a gap. The present invention also relates to a high power density servo motor, comprising the above-mentioned stator structure, a rotor and its rotor magnetic steel, the magnetic steel is attached to the outer surface of the rotor iron core, and the outer surface of the magnetic steel adopts an eccentric structure; the rotor Located inside the stator structure and coaxial with the stator; the air gap between the stator structure and the rotor is a non-uniform air gap. The invention can not only ensure the inner circle of the stator iron core is smooth, reduce the cogging torque of the motor, but also improve the slot full rate of the motor.

Description

technical field [0001] The invention relates to the technical field of servo motors, in particular to a permanent magnet servo motor with high power density and a stator structure thereof. Background technique [0002] With the complexity of industrial production applications and the continuous improvement of control performance requirements, the requirements for servo motors are also getting higher and higher. As the driving actuators of each joint of the robot, permanent magnet motors with high power density have become the mainstream. With the continuous improvement of the performance of permanent magnet materials, the power density of permanent magnet motors has also increased. The slot filling rate has become one of the main technical bottlenecks for improving the power density of the motor, and the structure of the stator core determines the slot filling rate of the motor. [0003] In the patent "A High-Slot Filling Rate and High-performance Open-Slot Straight-toothed...

AI Technical Summary

Problems solved by technology

The segmented stator core improves the slot fill rate of the motor, but the smoothness of the inner circle of the iron core after splicing directly affects the cogging effect of the motor and reduces the performance of the motor

At present, the segmented splicing stator core structure is mainly concentrated in the ring core structure, and the outer casing of the stator core is covered. It is difficult to realize the motor structure without a casing by segmented splicing.

[0009] Another way is to connect the stator teeth together through the tooth tips of the inner ring, and the coil is wound in the upper tooth slot through the outer ring, such as image 3 As shown, this is beneficial to improve the slot full rate of the motor, but the tooth tips of the inner ring are connected, which will cause the magnetic field generated by the permanent magnet to form a closed-loop magnetic circuit through the tooth tips, which increases the tooth tip magnetic flux leakage and affects the output power of the motor.

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