# US 10,312,779 B2 · Punching sheet used for manufacturing rotor and permanent magnet motor comprising rotor

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- Number: US 10,312,779 B2
- Document ID: US10312779B2
- Status: Granted
- Kind: B2
- Application number: 15/214,410
- Filed: 2016-07-19
- Published: 2017-02-02
- Granted: 2019-06-04
- Earliest claimed: 2015-07-30
- Assignees: Zhongshan Broad-Ocean Motor Co., Ltd.; Broad-Ocean Motor Ev Co., Ltd.
- Applicants: Zhongshan Broad-Ocean Motor Co., Ltd.; Broad-Ocean Motor Ev Co., Ltd.
- Inventors: Mingming Hu
- Web page: https://patentgrep.com/patent/US10312779B2

## CPC

- H02K 15/03: having permanent magnets
- H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K 29/03: with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
- H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A punching sheet used for manufacturing a rotor, including an axle hole, an outer edge, and a plurality of mounting grooves for receiving permanent magnets. The axle hole is disposed at the center of the punching sheet, and the plurality of mounting grooves are disposed in the proximity of the outer edge of the punching sheet. The outer edge of the punching sheet includes a plurality of arcs which have equal length and are connected to one another, and a center of a circle corresponding to each arc deviates from the center of the axle hole.

## Claims

### Claim 1

A punching sheet used for manufacturing a rotor, comprising an axle hole, an outer edge, and a plurality of mounting grooves for receiving permanent magnets;
wherein
the axle hole is disposed at a center of the punching sheet, and the plurality of mounting grooves are disposed in the proximity of the outer edge of the punching sheet;
the outer edge of the punching sheet comprises a plurality of arcs;
the plurality of the arcs are connected to one another;
the plurality of arcs are of equal arc length and equal radius;
the plurality of arcs have a radius of R2;
a center of each of the plurality of arcs deviates from a center of the axle hole; and
a circle centered at the center of the axle hole and tangent to the plurality of arcs has a radius of R1, and 0.7R1≤R2≤0.9R1.

### Claim 2 (depends on 1)

The punching sheet of claim 1, wherein two of the plurality of mounting grooves are disposed at an inner side of each of the plurality of arcs on the punching sheet, and the two of the plurality of mounting grooves are distributed symmetrically along a radial centerline of the each of the plurality of arcs.

### Claim 3 (depends on 1)

The punching sheet of claim 1, further comprising a plurality of magnetic isolating slots disposed between the axle hole and the plurality of mounting grooves.

### Claim 4 (depends on 3)

The punching sheet of claim 3, wherein a plurality of connecting ribs are formed between the plurality of magnetic isolating slots, and every two of the plurality of connecting ribs are crisscross.

### Claim 5 (depends on 1)

A permanent magnet motor, comprising:
a) a revolving shaft;
b) a rotor assembly, the rotor assembly comprising a rotor core and a plurality of permanent magnets disposed on the rotor core, the rotor core comprising a plurality of punching sheets of claim 1 which are stacked up;
c) a stator assembly;
d) a housing;
e) a front end cover; and
f) a rear end cover;
wherein
the rotor assembly is disposed on the revolving shaft;
the stator assembly and the housing are integrated and sleeved on the rotor assembly;
the front end cover and the rear end cover are disposed at two ends of the housing, respectively; and
two ends of the revolving shaft are supported by bearings of the front end cover and the rear end cover, respectively.

### Claim 6 (depends on 5)

The motor of claim 5, wherein two of the plurality of mounting grooves are disposed at an inner side of each of the plurality of arcs on the punching sheet, and the two of the plurality of mounting grooves are distributed symmetrically along a radial centerline of the each of the plurality of arcs.

### Claim 7 (depends on 5)

The motor of claim 5, wherein the punching sheet further comprises a plurality of magnetic isolating slots disposed between the axle hole and the plurality of mounting grooves.

### Claim 8 (depends on 7)

The motor of claim 7, wherein a plurality of connecting ribs are formed between the plurality of magnetic isolating slots, and every two of the plurality of connecting ribs are crisscross.