Iron core structure of motor rotor

Patent metadata

Field	Value
Publication number	US-12199472-B2
Application number	US-202217880313-A
Country	US
Kind code	B2
Filing date	Aug 3, 2022
Priority date	Aug 3, 2022
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

Main technical features of an iron core structure of motor rotor provided by the invention are that on a rotor iron core of a rotating motor, along a circumferential direction of a rotation axis of the motor as a center of circle, a plurality of through-hole-shaped spaces spaced apart from each other are arranged on the iron core in sequence. When the through-hole-shaped spaces form obstacles to a magnetic circuit in the rotor, the through-hole-shaped spaces are also provided for insertion of a plurality of straight rod-shaped coupling elements made of non-permeability magnetic material to fix an overlapping state of a plurality of silicon steel plates of the iron core in order to improve an overall rigidity of the iron core and reduce a possibility of deformation or damage of the silicon steel plates caused by centrifugal force of high-speed rotation.

First claim

What is claimed is:

1. An iron core structure of motor rotor comprising:
an annular iron core formed by coaxially overlapping a plurality of annular silicon steel plates in sequence, having an inner annular surface and an outer annular surface, and the outer annular surface being formed by a plurality of first arcs and a plurality of second arcs of two different radians alternately connected in series sequentially;
a plurality of magnet grooves spaced apart from one another, respectively disposed between the inner annular surface and the outer annular surface of the iron core, and penetratingly disposed in the iron core by extending along an axial direction parallel to a center of curvature of the inner annular surface of the iron core;
a plurality of paired through holes respectively penetratingly disposed in the iron core by extending along an axial direction parallel to the center of curvature of the inner annular surface of the iron core, and spaced apart from each other on two sides of each of the magnet grooves in a radial direction;
a plurality of paired hole-shaped magnetic barrier spaces respectively penetratingly disposed in the iron core by extending along an axial direction parallel to the center of curvature of the inner annular surface of the iron core, the paired magnetic barrier spaces being respectively disposed between one of the two sides of each of the magnet grooves and each of the paired through holes, communicating with the magnet groove by a first side, and communicating with the through hole by a second side; and
a plurality of straight rod-shaped coupling elements made of non-permeability magnetic material respectively inserted and fixed in each of the through holes, exerting opposing forces on two axial ends of the iron core, and acting on the overlapped silicon steel plates;
a hole wall of each of the through holes being abutted on a peripheral surface of each of the coupling elements inserted into a hole space of each of the through holes;
an inner diameter of each of the first sides being greater than an inner diameter of each of the second sides;
an inner diameter of each of the first sides being greater than an inner diameter of a communicating area between each of the first sides and each of the magnet grooves; and
an inner diameter of a communicating channel communicating the second side with the through hole being smaller than an inner diameter of the through hole.

2. The iron core structure of motor rotor as claimed in claimed 1 , wherein the through holes satisfy the following equation (I), and the magnetic barrier spaces and the adjacently communicated through holes satisfy the following equation (II):
α= D/Ro× 100%,1.9%≤α≤10.1%;  equation (I)

γ= F/Ro× 100%,11.3%≤γ≤14.3%;in the equations,  equation (II)

D is a diameter of the through holes;
Ro is a radius of the second arcs; and
F is a width of magnetic barrier between each of the magnetic barrier spaces and each of the through holes communicated with each other, and is a straight distance between the first side and a position of a center of curvature of the through hole.

3. The iron core structure of motor rotor as claimed in claimed 1 , wherein a shape of each of the magnetic barrier spaces is triangular, the first side defines a first side of the triangle, an inner hole wall defines a second side of the triangle, and an outer hole wall defines a third side of the triangle, and a position of each of the through holes communicating with each of the magnetic barrier spaces is located within a range of each of the third sides.

4. The iron core structure of motor rotor as claimed in claimed 1 , wherein in a radial direction of the iron core, an interior angle between an inner hole wall of the magnetic barrier space close to the inner annular surface of the iron core, and an outer hole wall of the magnetic barrier space close to the outer annular surface of the iron core is between 16° and 35°.

5. The iron core structure of motor rotor as claimed in claimed 1 , wherein in a radial direction of the iron core, an interior angle between the inner hole wall of the magnetic barrier space close to the inner annular surface of the iron core, and an inner groove surface of the adjacently communicated magnet groove close to the inner annular surface is between 150° and 190°.

6. The iron core structure of motor rotor as claimed in claimed 1 , wherein each of the coupling elements comprises a straight rod-shaped shaft inserted into each of the through holes, and two end portions located outside of two ends of the iron core axially, and each of the end portions is respectively fixed to two ends of the shaft.

7. The iron core structure of motor rotor as claimed in claimed 1 , wherein a radial section of each of the through holes is a circular plane geometric shape.

8. The iron core structure of motor rotor as claimed in claimed 1 , wherein a radial section of each of the through holes is an elliptical plane geometric shape.

9. The iron core structure of motor rotor as claimed in claimed 1 , wherein a radial section of each of the through holes is a polygonal plane geometric shape.

Assignees

• Hiwin Mikrosystem Corp

Inventors

• Nien Yu-Cheng
• Lin Yuan-Kai

Classifications

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K1/27 Primary

  Rotor cores with permanent magnets · CPC title

• H02K1/276 Primary

  Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] · CPC title