# US 2017/0250583 A1 · Motor rotor and motor having same

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- Number: US 2017/0250583 A1
- Document ID: US20170250583A1
- Status: Published application
- Kind: A1
- Application number: 15/328,940
- Filed: 2014-07-31
- Published: 2017-08-31
- Earliest claimed: 2014-07-31
- Assignees: Guangdong Meizhi Compressor Co., Ltd.
- Applicants: Guangdong Welling Motor Manufacturing Co., Ltd.; Midea Welling Motor Technology (Shanghai) Co., Ltd.
- Inventors: Guangming PENG; Fei WANG; Lidan ZHAO; Jintao CHEN; Z.Q. ZHU
- Web page: https://patentgrep.com/patent/US20170250583A1

## CPC

- H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K 1/146: {consisting of a generally annular yoke with salient poles}
- H02K 2201/03: Machines characterised by aspects of the air-gap between rotor and stator
- 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

An electric motor rotor (100) and an electric motor having the same are provided. The electric motor rotor (100) includes a rotor body (1) provided with a rotor bore (11) and a plurality of magnetic steel slots (12) surrounding the rotor bore (11), in which an outer contour of the rotor body (1) includes a plurality of concentric arc segments (101) in concentric with the rotor bore (11) and a plurality of connecting line segments (102) connecting adjacent concentric arc segments (101), and the connecting line segment (102) includes at least one straight line segment (1021), in which an included angle β between a central normal line of each straight line segment (1021) and a connecting line between a midpoint of the straight line segment (1021) and a center of the rotor bore (11) satisfies 0°≦β≦20°; and a plurality of magnetic steel bars (2).

## Claims

### Claim 1

An electric motor rotor, comprising:
a rotor body provided with a rotor bore and a plurality of magnetic steel slots surrounding the rotor bore, wherein an outer contour of the rotor body comprises a plurality of concentric arc segments in concentric with the rotor bore and a plurality of connecting line segments connecting adjacent concentric arc segments, the plurality of concentric arc segments are respectively corresponding to the plurality of magnetic steel slots in a radial direction, and the connecting line segment comprises at least one straight line segment, in which an included angle β between a central normal line of each straight line segment and a connecting line between a midpoint of the straight line segment and a center of the rotor bore satisfies 0°≦β≦20°; and
a plurality of magnetic steel bars, wherein at least one magnetic steel bar is provided in each of the plurality of magnetic steel slots.

### Claim 2 (depends on 1)

The electric motor rotor according to claim 1, wherein a central angle α of the concentric arc segment satisfies α=360/P*θ, in which P represents the number of rotor poles, and 0<θ≦0.8.

### Claim 3 (depends on 1)

The electric motor rotor according to claim 1, wherein the connecting line segment comprises at least two straight line segments.

### Claim 4 (depends on 1)

The electric motor rotor according to claim 1, wherein a magnetic bridge is defined between two ends of each magnetic steel slot and the connecting line segment adjacent to the ends of the magnetic steel slot, and a thickness T of the magnetic bridge has a range of 0.3 mm≦T≦1.0 mm.

### Claim 5 (depends on 1)

The electric motor rotor according to claim 1, wherein a plurality of slits are formed between the magnetic steel slot and its corresponding concentric arc segment, and are spaced apart from each other.

### Claim 6 (depends on 5)

The electric motor rotor according to claim 5, wherein the plurality of slits is symmetrical relative to a connecting line between a midpoint of the concentric arc segment and the center of the rotor bore.

### Claim 7 (depends on 5)

The electric motor rotor according to claim 5, wherein two slits are provided.

### Claim 8 (depends on 7)

The electric motor rotor according to claim 7, wherein the two slits are both parallel to the connecting line between the midpoint of the concentric arc segment and the center of the rotor bore.

### Claim 9 (depends on 8)

The electric motor rotor according to claim 8, wherein a distance L between the two slits and a distance Lm between two ends of the magnetic steel bar in the magnetic steel slot satisfy L=Lm*k, in which 0.2≦k≦0.8.

### Claim 10 (depends on 7)

The electric motor rotor according to claim 7, wherein respective first ends of the two slits adjacent to the concentric arc segment are inclined towards the connecting line between the midpoint of the concentric arc segment and the center of the rotor bore.

### Claim 11 (depends on 10)

The electric motor rotor according to claim 10, wherein a distance between the respective first ends of the two slits adjacent to the concentric arc segment is denoted as L1, and a distance between respective second ends of the two slits adjacent to the magnetic steel slot is denoted as L2, in which 0.5≦L1/L2≦0.8.

### Claim 12 (depends on 11)

The electric motor rotor according to claim 11, wherein the distance Lm between the two ends of the magnetic steel bar in the magnetic steel slot satisfies L2=Lm*k, in which 0.2≦k≦0.8.

### Claim 13 (depends on 5)

The electric motor rotor according to claim 5, wherein a distance between a first end of the slit adjacent to the concentric arc segment and the concentric arc segment is denoted as H1, and a distance between a second end of the slit adjacent to the magnetic steel slot and the magnetic steel slot is denoted as H2, in which 0.3 mm≦H1≦0.6 mm and 0.3 mm≦H2≦0.6 mm.

### Claim 14 (depends on 1)

The electric motor rotor according to claim 1, wherein the magnetic steel slot has an elongated shape and is perpendicular to a connecting line between a midpoint of the concentric arc segment and the center of the rotor bore, and each of the plurality of magnetic steel slots has one magnetic steel bar therein.

### Claim 15

An electric motor, comprising:
an electric motor stator provided with a stator bore and a plurality of stator slots surrounding the stator bore, wherein the stator slots are in communication with the stator bore, and a stator tooth is defined between adjacent stator slots; and
an electric motor rotor comprising:
a rotor body provided with a rotor bore and a plurality of magnetic steel slots surrounding the rotor bore, wherein an outer contour of the rotor body comprises a plurality of concentric arc segments in concentric with the rotor bore and a plurality of connecting line segments connecting adjacent concentric arc segments, the plurality of concentric arc segments are respectively corresponding to the plurality of magnetic steel slots in a radial direction, and the connecting line segment comprises at least one straight line segment, in which an included angle β between a central normal line of each straight line segment and a connecting line between a midpoint of the straight line segment and a center of the rotor bore satisfies 0≦β≦20; and
a plurality of magnetic steel bars, wherein at least one magnetic steel bar is provided in each of the plurality of magnetic steel slots;
wherein the electric motor rotor is rotatably disposed in the stator bore, and the rotor bore is in concentric with the stator bore.

### Claim 16 (depends on 15)

The electric motor according to claim 15, wherein a radially inner end face of the stator tooth is formed as an arc end face in concentric with a center of the stator bore.

### Claim 17 (depends on 15)

The electric motor according to claim 15, wherein the number S of stator slots and the number P of rotor poles of the electric motor rotor satisfy P/S=2/3.

### Claim 18 (depends on 15)

The electric motor according to claim 15, wherein a central angle α of the concentric arc segment satisfies α=360/P*θ, in which P represents the number of rotor poles, and 0<θ≦0.8.

### Claim 19 (depends on 15)

The electric motor according to claim 15, wherein the connecting line segment comprises at least two straight line segments.

### Claim 20 (depends on 15)

The electric motor according to claim 15, wherein a magnetic bridge is defined between two ends of each magnetic steel slot and the connecting line segment adjacent to the magnetic steel slot, and a thickness T of the magnetic bridge has a range of 0.3 mm≦T≦1.0 mm.