CN211655862U

CN211655862U - Rotor, motor and compressor

Info

Publication number: CN211655862U
Application number: CN202020023662.1U
Authority: CN
Inventors: 黄坚德; 范清姗
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Landa Compressor Co Ltd
Priority date: 2020-01-07
Filing date: 2020-01-07
Publication date: 2020-10-09
Anticipated expiration: 2030-01-07

Abstract

The utility model discloses a rotor, motor and compressor, wherein the rotor includes rotor core, and the cylinder of rotor core is formed with the arc surface that the multistage concentric setting, and the arc surface includes the first arc surface that intersects with the q axle, the third arc surface that intersects with the d axle, and the second arc surface that is located between first arc surface and the third arc surface; the first circular arc surface diameter L1, the second circular arc surface diameter L2 and the third circular arc surface diameter L3 satisfy L3 > L1 > L2, so that the rotor core is formed with an inner groove. The rotor uses concentric circular arc inner groovy, is favorable to under the condition that does not increase back electromotive force distortion, reduces tooth's socket torque and torque fluctuation, and less tooth's socket torque and torque fluctuation are favorable to reducing the noise vibration of motor, are favorable to improving the stationarity of motor output torque, reduce the unbalanced force that causes to the bearing to reach the effect that reduces motor noise vibration.

Description

Rotor, motor and compressor

Technical Field

The utility model belongs to the refrigeration field especially relates to a rotor, motor and compressor.

Background

At present, the country advocates a green development road, encourages enterprises to improve the motor energy efficiency, and the motor gradually develops towards high energy efficiency and low noise. The motor vibration is easily caused by the overlarge cogging torque and the motor torque fluctuation, and the two have great influence on the noise vibration of the motor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a rotor, motor and compressor to reduce the rotor noise.

In order to achieve the above object, the present invention provides a technical comparison example of a rotor, a motor and a compressor, comprising:

a rotor comprises a rotor iron core, wherein a plurality of sections of arc surfaces which are concentrically arranged are formed on the cylindrical surface of the rotor iron core, and each arc surface comprises a first arc surface which is intersected with a q axis, a third arc surface which is intersected with a d axis, and a second arc surface which is positioned between the first arc surface and the third arc surface; the first circular arc surface diameter L1, the second circular arc surface diameter L2 and the third circular arc surface diameter L3 satisfy L3 > L1 > L2, so that the rotor core is formed with an inner groove.

Furthermore, the second arc surface is positioned between 15 degrees and 25 degrees clockwise and anticlockwise on the d axis.

Furthermore, the second arc surface is positioned between 22 degrees and 24 degrees clockwise and anticlockwise on the d axis.

Furthermore, a connecting plane is formed between the adjacent arc surfaces.

Furthermore, the connecting plane is used for connecting the first arc surface and the second arc surface; the included angle theta between the connecting plane and the d axis meets the condition that theta is more than or equal to 25 degrees and less than 90 degrees.

Furthermore, the upper edge of the rotor core is provided with a magnetic steel groove for inserting magnetic steel, and the tail end of the magnetic steel groove extends inwards to form a notch.

Further, the notches are triangular.

Furthermore, the diameter L1 of the first arc surface and the diameter L3 of the third arc surface meet the requirement that the diameter L3-L1 is not less than 0.6 mm.

An electric machine comprising the rotor.

A compressor comprises the rotor.

The utility model discloses a rotor, motor and compressor have following advantage:

1. the concentric circular arc inner grooves are used, so that the cogging torque and the torque fluctuation are reduced under the condition that the back electromotive force distortion is not increased, the noise vibration of the motor is reduced due to the smaller cogging torque and the torque fluctuation, the stability of the output torque of the motor is improved, the unbalanced force caused by the bearing is reduced, and the effect of reducing the noise vibration of the motor is achieved.

2. The magnetic leakage is reduced, a good magnetic gathering effect is facilitated to be formed, and the counter electromotive force of the motor is improved, so that the copper loss of the motor is reduced, and the effect of improving the efficiency of the motor is achieved.

Drawings

Fig. 1 is a schematic structural view of rotors according to embodiments 1 and 2 of the present invention;

FIG. 2 is a schematic view of the non-notched rotor of the present invention;

fig. 3 is a schematic structural view of a notched rotor according to embodiment 3 of the present invention.

The notation in the figure is:

1. a rotor core; 11. a magnetic steel groove; 2. and (6) cutting.

Detailed Description

In order to better understand the purpose, structure and function of the present invention, the following description of the rotor, the motor and the compressor according to the present invention is made in detail with reference to the accompanying drawings.

The utility model discloses a compressor includes motor and cylinder, and the motor passes through the roller rotation in the bent axle drives the cylinder, compresses the gas in the cylinder, does work. The motor comprises a stator and a rotor, and the rotor is driven to rotate through electromagnetic induction. The rotor comprises a rotor core and magnetic steel, and the magnetic steel is distributed on the rotor core along the circumferential direction.

Example 1

As shown in fig. 1, a plurality of concentrically arranged arc surfaces are formed on the cylindrical surface of the rotor core, and each of the concentrically arranged arc surfaces includes a first arc surface intersecting with the q-axis, a third arc surface intersecting with the d-axis, and a second arc surface located between the first arc surface and the third arc surface. The diameter of the first circular arc surface L1, the diameter of the second circular arc surface L2 and the diameter of the third circular arc surface L3 meet the requirements that L3 is more than L1 and more than L2; so that the rotor core is formed with an inner groove. The difference between L1 and L3 is 0.2 mm-L3-L1-0.6 mm, preferably 0.2 mm.

The second arc surface is positioned between 15 degrees and 25 degrees clockwise and anticlockwise on the d axis. Preferably, the d axis is positioned between 22 degrees and 24 degrees clockwise and anticlockwise. And a connecting plane is formed between the adjacent arc surfaces.

Comparative example 1

The rotor core of this comparative example differs from the rotor core of example 1 in that the second arc surface is eliminated, and the first arc surface and the second arc surface are directly connected by two connection planes, thereby forming an inner groove.

Measured data for example 1 and comparative example 1

Table 1: noise actual measurement data:

test object	90HZ torque ripple	60hz noise value	90hz noise value
				Comparative example 1	9.1％	67.6dB	76.4dB
Example 1	7.3％	67.6dB	74.9dB

Note: the high-frequency noise of the motor is large, so that 90HZ noise is focused in experiments, and low-frequency noise is not tested, so that no noise test data exists at 30 HZ.

Can follow table 1 and derive, the second section circular arc that this patent was add forms the inner groovy, and cogging torque and the torque ripple that can effectual reduction motor reduce motor noise vibration.

Table 2-1: motor-mounted compressor test data:

tables 2 to 2: measured data with the motor working frequency of 30 HZ:

tables 2 to 3: the motor working frequency is measured data of 60 HZ:

note: since the compressor low frequency accounts for over 70%, the motor test only tested 30HZ and 60HZ efficiencies.

As can be seen from the comparative analysis of tables 2-2 and tables 2-3, the rotor power described in example 1 is low and the motor efficiency is high. Due to the existence of the second arc surface, the magnetic resistance close to the magnetism isolating bridge side is increased, the magnetic leakage of the motor is reduced, and the counter electromotive force of the rotor in the table 2-1 is increased. Therefore, under the same conditions, the rotor current of the rotor in the embodiment 1 is slightly smaller than that of the rotor in the comparative example 2 in the tables 2-2, the copper loss is reduced, the iron loss is the same, and the efficiency is improved.

Example 2

As shown in fig. 1, the rotor core according to embodiment 2 is different from the rotor core according to embodiment 1 in that a connection plane connecting the first arc surface and the second arc surface has an included angle θ with the d-axis that satisfies an angle θ of 25 ° or more and less than 90 °.

The length of the magnetic isolation bridge can be prolonged, magnetic leakage is reduced, the magnetic isolation effect of the magnetic steel is improved, the included angle between the line segment and the d axis is larger than or equal to 25 degrees and smaller than 90 degrees, the size of the L1 can be changed due to the structure, the L1 is allowed to be enlarged, when the angle is 90 degrees, the L1 structure is basically fixed and cannot move, the length of the magnetic isolation bridge is fixed and cannot be extended, the distance between the L1 and the circle center is short due to the fact that the angle is 90 degrees, the space position of the magnetic steel groove is limited, the length of the magnetic steel which can be plugged is influenced, the angle is larger than or equal to 25 degrees and smaller than 90 degrees, the L1 moves outwards, the space is enlarged, and the using amount of the magnetic steel which can be plugged is increased.

Measured data for example 2 and corresponding comparative example

As shown in the table, the method of increasing the magnetic isolation bridge by outwards moving the L1 by using the angle of 25 DEG to theta less than 90 DEG can reduce the magnetic leakage and improve the counter electromotive force value.

It can be seen from comparative examples 1, 2 and 3 that L3-L1 have a relatively large influence on back emf and torque ripple, and the smaller the values of L3-L1, the longer the opposing magnetic shield bridge, the greater the back emf, the relatively smaller the torque ripple, and the selection of the length of the magnetic shield bridge requires consideration of the strength thereof, and therefore, the smaller L3-L1 is not the better.

As can be seen from the comparative examples 1, 4 and 5, the lengths of the magnetic isolation bridges at different angles are changed, the back electromotive force is also changed, but the trend that the back electromotive force is always increased or decreased when the angle is decreased is not presented, so that the selection of the angle is related to the outer diameter size of the rotor; under the condition that L3-L1 is unchanged, the most appropriate angle is selected as far as possible so that the length of the magnetic isolation bridge is the maximum.

If θ is less than 25 °, the rotor core is difficult to machine and form, and therefore no experiment is performed.

Example 3

As shown in fig. 2, the upper edge of the rotor core is provided with a magnetic steel slot for inserting magnetic steel, the tail end of the magnetic steel slot extends inwards to form a notch, and the notch is triangular, so that the length L of the connecting part is increased, the magnetic resistance of the q-axis side is increased, the magnetic flux generated by the stator is correspondingly reduced through the reluctance torque formed by the q-axis, and the utilization rate of the reluctance torque of the motor is reduced through the increase of the q-axis reluctance.

Measured data for example 3 and corresponding comparative example

As shown in the table, increasing the length L of the connecting portion reduces the leakage flux, which is equivalent to extending the length of the magnetic shield bridge, thereby increasing the magnetic resistance of the leakage flux path, and the leakage flux that can pass is reduced, thereby increasing the counter electromotive force.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes or equivalents may be substituted for elements thereof by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are intended to be covered by the present invention.

Claims

1. A rotor comprises a rotor iron core (1) and is characterized in that a plurality of sections of arc surfaces which are concentrically arranged are formed on a cylindrical surface of a reluctance rotor, and each arc surface comprises a first arc surface which is intersected with a q axis, a third arc surface which is intersected with a d axis and a second arc surface which is positioned between the first arc surface and the third arc surface; the first circular arc surface diameter L1, the second circular arc surface diameter L2 and the third circular arc surface diameter L3 meet the conditions that L3 is larger than L1 is larger than L2, and therefore the rotor core (1) is provided with an inner groove.

2. The rotor of claim 1 wherein the second arcuate surface is positioned between 15 ° and 25 ° clockwise and counterclockwise of the d-axis.

3. The rotor of claim 2 wherein the second arcuate surface is positioned between 22 ° and 24 ° clockwise and counterclockwise of the d-axis.

4. The rotor of claim 1, wherein adjacent circular arc surfaces define a connecting plane therebetween.

5. The rotor of claim 4, wherein a connection plane connecting the first circular arc surface and the second circular arc surface; the included angle theta between the connecting plane and the d axis meets the condition that theta is more than or equal to 25 degrees and less than 90 degrees.

6. The rotor as recited in claim 1, characterized in that the rotor core (1) is provided with a magnetic steel slot (11) at the upper edge for inserting magnetic steel, and the end of the magnetic steel slot (11) extends inwards to form a notch (2).

7. The rotor as recited in claim 6, characterized in that the cutouts (2) are triangular.

8. The rotor as claimed in claim 1, wherein the first circular arc surface diameter L1 and the third circular arc surface diameter L3 satisfy 0.2mm ≦ L3-L1 ≦ 0.6 mm.

9. An electrical machine comprising a rotor according to any one of claims 1-8.

10. A compressor, characterized by comprising a rotor according to any one of claims 1-8.