CN211127345U

CN211127345U - Rotor punching sheet, rotor, motor and compressor

Info

Publication number: CN211127345U
Application number: CN201921918045.1U
Authority: CN
Inventors: 黄坚德
Original assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Landa Compressor Co Ltd
Current assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Landa Compressor Co Ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-07-28
Anticipated expiration: 2029-11-08

Abstract

The utility model discloses a rotor punching sheet, including seting up the auxiliary groove on the outmost circular arc of rotor, the position of auxiliary groove is established in 5 degrees to 10 degrees intervals with rotor punching sheet's the ascending orientation of q axle clockwise rotation, when the rotor rotates, reach and reduce the tooth's socket torque, increase back electromotive force and reduce the undulant effect of torque. The rotor comprises an auxiliary groove and a rotating shaft hole arranged in the center of the rotor, wherein the auxiliary groove is of the structure of the auxiliary groove of the rotor; the auxiliary groove is formed in the outer circular arc of the rotor, and due to the particularity of the design position of the auxiliary groove, the better effects of reducing the cogging torque, increasing the counter electromotive force and reducing the torque fluctuation are achieved.

Description

Rotor punching sheet, rotor, motor and compressor

Technical Field

The utility model belongs to the technical field of the motor, especially, relate to a rotor punching, rotor, motor and compressor.

Background

In short, the fixed part of the motor is called a stator, the rotating part is called a rotor, and the rotor refers to a rotating body supported by a bearing. A pair of DC excited static main magnetic poles are arranged on the magnetic pole; the rotating part (rotor-rotor) is called an armature core, an armature winding is arranged on the rotating part, and after the armature core is electrified, induced electromotive force is generated to serve as a rotating magnetic field, and then electromagnetic torque is generated to carry out energy conversion.

The existing rotor has no auxiliary groove, and some rotors have the auxiliary groove, but the auxiliary groove does not play a noise reduction role at all if the auxiliary groove is not opened at a proper position and is not proper in the appearance structure of the rotor. The design can reduce the torque and torque fluctuation of the tooth socket, reduce the magnetic leakage and increase the magnetic gathering capacity.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a rotor punching, rotor, motor and compressor to solve the problem of background art.

In order to achieve the above object, the utility model discloses a rotor punching, rotor, motor and compressor's concrete technical scheme as follows:

the rotor punching sheet comprises an auxiliary groove arranged on an outermost circular arc of the rotor punching sheet, and the position of the auxiliary groove is arranged in an interval of 5 degrees to 10 degrees in the clockwise rotation direction of a q axis of the rotor punching sheet.

Furthermore, the position of the auxiliary groove is also arranged in an interval of 5 degrees to 10 degrees in the anticlockwise rotation direction of the q axis of the rotor punching sheet.

Further, the distance from the q-axis arc of the rotor sheet to the axis of the rotor sheet is L, and the minimum distance L1 from the auxiliary groove arc to the axis of the rotor sheet meets the requirement that L1 is L ± 0.5 mm.

Further, the auxiliary groove is composed of a section of circular arc.

Furthermore, two adjacent auxiliary grooves are symmetrically arranged about a q axis of the rotor punching sheet.

Furthermore, a plurality of auxiliary grooves are radially distributed on the outer circular arc of the rotor punching sheet.

A rotor comprises at least two rotor sheets, wherein each rotor sheet comprises an auxiliary groove and a rotating shaft hole formed in the center of each rotor sheet.

Furthermore, a plurality of magnetic steel grooves and magnetic circuit optimization holes are radially formed around the rotating shaft hole of the rotor punching sheet.

An electric machine comprises the rotor.

A compressor comprises the motor.

Compared with the prior art, the utility model discloses following beneficial effect has:

the auxiliary groove is formed in the outer circular arc of the rotor, and due to the particularity of the design position of the auxiliary groove, the better effects of reducing the cogging torque, increasing the counter electromotive force and reducing the torque fluctuation are achieved.

Drawings

FIG. 1 is a schematic view of a prior art rotor;

FIG. 2 is a schematic structural view of a rotor of the present invention;

FIG. 3 is a partially enlarged view of the auxiliary groove of FIG. 2;

FIGS. 4, 6 and 8 are experimental diagrams of the rotor without the auxiliary groove;

fig. 5, 7 and 9 are experimental diagrams of the rotor with the additional auxiliary groove.

The reference numbers in the figures illustrate: rotor punching sheet 1, pivot hole 2, auxiliary groove 3, magnet steel groove 4, magnetic circuit optimize hole 5.

Detailed Description

For a better understanding of the objects, structure and function of the invention, reference should be made to the drawings, FIGS. 1-9, which are included to illustrate the invention.

As shown in fig. 1, in order to obtain control characteristics similar to a dc motor in the control of a permanent magnet synchronous motor, a coordinate system is established on a rotor sheet 1 of the motor, the coordinate system rotates synchronously with the rotor sheet 1, the direction of a rotor magnetic field is taken as the d axis, and the direction perpendicular to the rotor magnetic field is taken as the q axis, and a mathematical model of the motor is converted into the coordinate system, so that decoupling of the d axis and the q axis can be realized, and good control characteristics can be obtained.

Most rotor punching 1 that has auxiliary groove 3 among the prior art also opens on rotor punching 1 outmost circular arc, and the noise reduction effect is poor, nevertheless the utility model discloses an invent point lies in: the position of the auxiliary groove 3 is unique, and the auxiliary groove 3 is arranged on a q-axis arc section and belongs to a second section of arc. Two adjacent auxiliary grooves 3 are symmetrically arranged about the q axis of the rotor sheet 1, wherein the auxiliary grooves 3 can be a plurality of and are radially distributed on the outer arc of the rotor sheet 1.

As shown in FIG. 2, the scheme mainly achieves the effects of reducing cogging torque, increasing back electromotive force and reducing torque fluctuation by arranging an auxiliary groove 3 at the outer circular arc of a rotor sheet 1, wherein the structure of the auxiliary groove 3 of the rotor sheet 1 has the following limiting conditions that 1, the auxiliary groove 3 is between 5 degrees and 10 degrees clockwise and anticlockwise of a q axis, the auxiliary groove 3 is composed of a section of circular arc, 2, the circular arc center of the auxiliary groove 3 is positioned at the outer side of the rotor sheet 1 deviating from the axis of the rotor or on the outer circular arc of the

rotor sheet

1, 3, the q axis circular arc of the rotor sheet 1 is defined as L, the minimum distance L1 from the circular arc of the auxiliary groove 3 to the axis of the rotor sheet 1 meets the following requirements, and L1 is L +/-0.5 mm.

The motor is internally provided with a rotor and a stator, the rotor is designed by improving a rotor punching sheet 1 in the motor, and the rotor comprises a rotating shaft hole 2 arranged at the center of the rotor punching sheet 1 in the prior art, a rotating shaft hole 2 with the rotor punching sheet 1 as the center, and a plurality of magnetic steel grooves 4 and magnetic circuit optimization holes 5 radially arranged around. Simultaneously, the auxiliary tank 3 of seting up on rotor punching 1 is foretell the utility model relates to a rotor auxiliary tank 3 structure. The rotor punching sheet 1 of the design can also be used in a compressor.

From the experimental data shown in fig. 4 to 9, the rotors in fig. 4, 6 and 8 are without the auxiliary groove 3, and the rotors in fig. 5, 7 and 9 are with the auxiliary groove 3, and it can be seen from fig. 4 and 5 that the cogging torque amplitude is reduced from 0.087 to 0.065, which is originally 0.065, and is reduced by 25% after the auxiliary groove 3 is added.

The cogging torque can cause the motor to generate vibration and noise, torque fluctuation occurs, so that the motor cannot run stably and the performance of the motor is influenced, the low-speed performance of the motor in a speed control system and the high-precision positioning of the motor in a position control system can be influenced by overlarge cogging torque, and in variable-speed driving, when the torque pulsation frequency is consistent with the mechanical resonance frequency of a stator or a rotor, the vibration and the noise generated by the cogging torque are amplified, so that the reduction of the cogging torque is beneficial to the reduction of the noise and the vibration of the motor.

As can be seen from fig. 6 and 7, after the auxiliary groove 3 is additionally arranged, the back electromotive force is increased from 46.53V to 46.57V, the magnetic flux gathering effect is enhanced, the back electromotive force is improved, the stronger the magnetic flux gathering capability of the motor is, the less the magnetic flux leakage is, the utilization rate of the representative magnetic steel is increased, the stronger the generated magnetic field is, the current of the motor during operation can be reduced, and therefore the effects of reducing copper loss and improving the efficiency of the motor are achieved.

As can be seen from fig. 8 and 9, the torque ripple is reduced from 7.55% to 4.8% after the auxiliary groove 3 is added, which is reduced by 2.75%, the torque ripple not only causes the motor body to vibrate, but also causes the components directly or indirectly contacted with the motor to vibrate, the motor noise is also large due to the large torque ripple, and the system resonance is easily caused, and the reduction of the torque ripple is also beneficial to the reduction of the motor noise vibration.

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. The utility model provides a rotor punching, includes sets up supplementary groove (3) on the outermost circular arc of rotor punching (1), its characterized in that: the auxiliary groove (3) is arranged in an interval of 5 degrees to 10 degrees in the clockwise rotation direction of the q axis of the rotor punching sheet (1).

2. The rotor punching according to claim 1, characterized in that the position of the auxiliary groove (3) is also arranged within the interval of 5 degrees to 10 degrees in the counter-clockwise direction of rotation of the q-axis of the rotor punching (1).

3. The rotor punching sheet according to claim 2, wherein the distance from the q-axis arc of the rotor punching sheet (1) to the axial center of the rotor punching sheet (1) is L, and the minimum distance L1 from the auxiliary groove (3) arc to the axial center of the rotor punching sheet (1) meets the requirement of L1 being L ± 0.5 mm.

4. The rotor sheet as recited in claim 3, characterised in that the auxiliary groove (3) consists of a segment of a circular arc.

5. The rotor punching sheet according to claim 4, wherein the auxiliary grooves (3) are symmetrically arranged with respect to the q axis of the rotor punching sheet (1).

6. The rotor punching sheet according to claim 5, wherein the plurality of auxiliary grooves (3) are radially distributed on the outer arc of the rotor punching sheet (1).

7. A rotor comprising at least two rotor sheets (1) as set forth in any one of claims 1-6, wherein the rotor sheets (1) comprise an auxiliary groove (3) and a rotating shaft hole (2) arranged at the center of the rotor sheets (1).

8. The rotor as recited in claim 7, characterized in that a plurality of magnetic steel slots (4) and magnetic circuit optimization holes (5) are radially formed around the rotating shaft hole (2) of the rotor punching sheet (1).

9. An electrical machine comprising a rotor as claimed in claim 7 or 8.

10. A compressor comprising the motor of claim 9.