Rotor, motor comprising rotor and power device comprising motor

Abstract

The embodiment of the invention provides a rotor, a motor comprising the rotor and a power device comprising the motor. The rotor is located at the periphery of a rotating shaft of the motor and rotates together with the rotating shaft. The rotor is composed of electromagnetic steel plates laminated in the axial direction, each electromagnetic steel plate is provided with a through hole group penetrating through the electromagnetic steel plate in the axial direction, the through hole group has a plurality of through holes, and the plurality of through holes take an imaginary line extending inthe radial direction as a center line and are in an arc shape extending towards two sides and the radial outer side of the center line. In addition, the plurality of through holes are arranged in theradial direction, wherein the curvature radius of the arc-shaped surface, which is located at the radial inner side, of the through hole at the radial inner most side in the plurality of through holesis the minimum, and/or the curvature radius of the arc-shaped surface, which is located at the radial outer side, of the through hole at the radial outer most side in the plurality of through holes is the maximum. According to the structure of the rotor, the reluctance difference between the electromagnetic steel plates forming the rotor can be enlarged, so that the reluctance torque is increased, and the torque ripple is reduced.

Description

technical field [0001] The invention relates to the field of motors, in particular to a rotor, a motor including the rotor, and a power device including the motor. Background technique [0002] In the rotor of a synchronous reluctance motor, there are many through holes in the middle of the electromagnetic steel plate that constitutes the rotor. These through holes form an air gap called a flux barrier. These air gaps cause a difference in reluctance. When the motor is supplied with current, Reluctance torque is generated due to the difference in reluctance. [0003] figure 1 is a schematic diagram of the air gap of the electromagnetic steel plate constituting the rotor in the prior art; figure 2 is in the prior art figure 1 Enlarged view of dashed box P shown. Wherein, it is defined that the direction in which the magnetic flux is easy to travel in the rotor is the direct axis (d axis), and the direction in which the magnetic flux is difficult to travel is the horizont...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, in the existing synchronous reluctance motor 10, each air gap 13 of the electromagnetic steel plate 12 constituting the rotor 11 has the same width in the radial direction of the motor, or the width gradually decreases from the radially inner side to the radially outer side (not shown ), resulting in an increase in the torque ripple of the motor, thereby suppressing the reluctance torque of the motor and affecting the practicability of the motor

[0004] and, if figure 1 and figure 2 As shown, in the direction of the d-axis, the width of the electromagnetic steel plate 12 between the two radially innermost air gaps 13 decreases from the radially inner side to the radially outer side, that is, A

As a result, the reluctance difference between the reluctance in this region and the flux barrier is reduced, thereby reducing the reluctance torque

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