Rotors, motors and electric power steering
A technology of rotors and rotor cores, applied in electromechanical devices, electric components, magnetic circuit rotating parts, etc., can solve problems such as torque reduction, reduce cogging torque, reduce torque ripple, and restrain torque reduction Effect
Active Publication Date: 2022-07-01
NIDEC CORP
View PDF13 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0008] Regarding the cogging torque, the usual countermeasure is to eliminate it by applying a skew to generate a reverse phase, but there is a problem that the torque decreases due to the skew
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0025] In the following description, the axial direction of the center axis J, that is, the direction parallel to the vertical direction is simply referred to as "axial direction", and the radial direction with the center axis J as the center is simply referred to as "radial direction". The circumferential direction centered on the central axis J is simply referred to as the "circumferential direction". In this embodiment, the upper side (+Z) corresponds to one side in the axial direction, and the lower side (−Z) corresponds to the other side in the axial direction. In addition, the vertical direction, the upper side, and the lower side are only names for describing the relative positional relationship of each part, and the actual arrangement relationship and the like may be an arrangement relationship other than the arrangement relationship and the like indicated by these names.
[0026] like figure 1 As shown, the motor 10 of the present embodiment includes a rotor 20 , a s...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
One embodiment of the rotor of the present invention includes a shaft having a central axis, a rotor core, and a magnet portion and a magnetic portion arranged radially on the radially outer surface of the rotor core. On the radially outer surface of the rotor core, a plurality of magnet parts and sets of magnetic parts are arranged in the circumferential direction and the axial direction, respectively. The plurality of groups include a first group in which the magnet portion is arranged on the radially outer surface of the rotor core, and the magnetic portion is arranged on the radially outer surface of the magnet portion, and a second group in which the radially outer surface of the rotor core is arranged. The magnetic portion is arranged on the outer surface, and the magnet portion is arranged on the radially outer surface of the magnetic portion. In the radial outer surface of the rotor core in the first part in the axial direction, the first group is arranged in the circumferential direction, and in the second part different from the first part in the axial direction, the second group is in the circumferential direction arrangement. When viewed from the axial direction, the first group of the first part and the second group of the second part are arranged to overlap.
Description
technical field [0001] The present invention relates to a rotor, a motor and an electric power steering device. Background technique [0002] Typically, a motor has a rotor and a stator. The rotor has at least one magnet. In order to reduce vibration and noise generated by the motor, it is necessary to reduce both cogging torque and torque ripple. [0003] Conventional motors reduce cogging torque by providing protrusions or deflections that cause phase reversal. The skew is disclosed in Patent Document 1, for example. In addition, torque ripple is reduced by increasing the sine wave rate of the induced voltage. [0004] prior art literature [0005] Patent Literature [0006] Patent Document 1: Japanese Patent No. 5414887 SUMMARY OF THE INVENTION [0007] The problem to be solved by the invention [0008] With regard to cogging torque, a common countermeasure is to apply a skew to generate an inverse phase and cancel it, but there is a problem that the torque is r...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/278
CPCH02K1/27
Inventor 一圆明阿部弘幸金城秀幸
Owner NIDEC CORP