CN210985752U - Permanent magnet motor and compressor - Google Patents
Permanent magnet motor and compressor Download PDFInfo
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- CN210985752U CN210985752U CN201922118885.6U CN201922118885U CN210985752U CN 210985752 U CN210985752 U CN 210985752U CN 201922118885 U CN201922118885 U CN 201922118885U CN 210985752 U CN210985752 U CN 210985752U
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Abstract
The utility model relates to a permanent-magnet machine and compressor, this motor includes that rotor and cover establish the stator outside the rotor, be formed with the armature tooth that extends towards the rotor on the stator, the clearance has between the outer peripheral face of rotor and the armature tooth, the rotor has a plurality of circular arc sections and a plurality of changeover portion, the circumference staggered arrangement of rotor is all followed to a plurality of circular arc sections and a plurality of changeover portion, and every changeover portion connects between two adjacent circular arc sections, so that the outer peripheral face of rotor is injectd jointly to a plurality of circular arc sections and a plurality of changeover portion, the centre of a circle of circular arc section does not coincide with the rotation center of rotor. Through the technical scheme, the circle center of the arc section and the rotation center of the rotor are eccentrically arranged, so that the distance between each point on the arc section and the armature teeth is different, namely, the gap between the outer peripheral surface of the rotor and the armature teeth is a non-uniform gap, the non-uniform gap can improve the air gap flux density waveform, reduce the harmonic in the electromotive force, further weaken the cogging torque and reduce the vibration and the noise of the motor.
Description
Technical Field
The disclosure relates to the technical field of motor production and manufacturing, in particular to a permanent magnet motor and a compressor using the same.
Background
Cogging torque, which is the torque produced by the interaction between the magnetic poles (usually permanent magnets) and the stator core when the coils are not energized, is caused by the tangential component of the interaction between the magnetic poles and the armature teeth of the stator. When the motor rotates, the magnetic conductance is greatly changed in a small range of the side face of the magnetic pole corresponding to the armature teeth, so that the stored energy of the magnetic field is changed, and the cogging torque is generated.
SUMMERY OF THE UTILITY MODEL
An object of the present disclosure is to provide a permanent magnet motor capable of effectively attenuating cogging torque, thereby reducing motor vibration and noise, and a compressor using the same.
In order to realize above-mentioned purpose, this disclosure provides a permanent-magnet machine, establish including rotor and cover stator outside the rotor, be formed with the orientation on the stator the armature tooth that the rotor extends, the outer peripheral face of rotor with the clearance has between the armature tooth, the rotor has a plurality of circular arc sections and a plurality of changeover portion, and is a plurality of circular arc section and a plurality of the changeover portion is all followed the circumference staggered arrangement of rotor, and every the changeover portion is connected adjacent two between the circular arc section, so that it is a plurality of circular arc section and a plurality of the changeover portion is injectd jointly the outer peripheral face of rotor, the centre of a circle of circular arc section with the center of rotation of rotor does not coincide.
Optionally, the distance between the circular arc segment and the armature teeth is 0.2mm-1 mm.
Optionally, a plurality of magnetic poles are arranged in the rotor, and a distance e between a circle center of the arc segment and a rotation center of the rotor and the number n of the magnetic poles satisfy the following relational expression:
e-1.0 < e cos (180/n) < e, wherein n is an even number greater than or equal to 4.
Optionally, the transition section is formed as a straight line transition section, and the circular arc section is in smooth transition connection with the straight line transition section.
Optionally, a plurality of mounting grooves for mounting the magnetic poles are formed in the rotor, the mounting grooves are arranged at intervals along the circumferential direction of the rotor, the arc sections are in one-to-one correspondence with the mounting grooves, each mounting groove comprises a first portion and a second portion, and the first portion and the second portion form a V-shaped structure with an opening facing the outer circumferential surface of the rotor.
Optionally, the first portion and the second portion are not communicated with each other, so that a side portion of the first portion and a side portion of the second portion jointly define a first magnetic isolation bridge located between the first portion and the second portion.
Optionally, each circular arc segment is located between the first part and the second part of the corresponding mounting groove, so that in two adjacent mounting grooves, one side part of the first part of one mounting groove, which is far away from the rotation center of the rotor, and one side part of the second part of the other mounting groove, which is far away from the rotation center of the rotor, are arranged opposite to the transition section and define a second magnetic isolation bridge together with the transition section.
Optionally, the rotor is configured as a centrosymmetric structure.
Optionally, a plurality of heat dissipation grooves are formed on the outer peripheral surface of the stator, and the plurality of heat dissipation grooves are arranged at intervals along the circumferential direction of the stator.
According to another aspect of the present disclosure, there is provided a compressor including the permanent magnet motor described above.
Through the technical scheme, in this disclosure, the outer peripheral face of torque comprises a plurality of circular arc sections and a plurality of changeover portions, and the centre of a circle of circular arc section and the center of rotation of rotor eccentric settings, like this, every point on the circular arc section is inequality with the distance between the armature tooth, and when permanent-magnet machine moved, the rotor rotated for the stator, when circular arc section and rather than adjacent changeover portion rotated for the armature tooth, the distance between circular arc section and changeover portion and the armature tooth changed at certain extent. That is, in the present disclosure, the gap (i.e., air gap) between the outer circumferential surface of the rotor and the armature teeth is a non-uniform gap that can improve the air gap flux density waveform, reduce harmonics in electromotive force, and further weaken cogging torque, and reduce motor vibration and noise. In addition, two adjacent circular arc sections are connected through the transition section, can make the distance between the outer peripheral face of rotor and the armature tooth gently change in certain extent, avoid certain point on the rotor outer peripheral face and the distance between the armature tooth to take place the sudden change, lead to motor vibration.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a top view of a permanent magnet electric machine provided in an exemplary embodiment of the present disclosure;
fig. 2 is a top view of a rotor of a permanent magnet electric machine provided in an exemplary embodiment of the present disclosure;
FIG. 3 is an enlarged view of portion C of FIG. 2;
FIG. 4 is an enlarged view of portion D of FIG. 2;
fig. 5 is a top view of a stator of a permanent magnet electric machine provided in an exemplary embodiment of the present disclosure.
Description of the reference numerals
1-rotor, 11-arc section, 12-transition section, 13-mounting groove, 131-first part, 132-second part, 14-first magnetism isolating bridge, 15-second magnetism isolating bridge, 16-first through hole, 17-second through hole, 2-stator, 21-armature tooth, 22-heat dissipation groove, A-circle center of arc section, B-rotation center of rotor, L1-length of first magnetism isolating bridge, L2-width of first magnetism isolating bridge, L3-length of second magnetism isolating bridge, and e-distance between circle center of arc section and rotation center of rotor.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the present disclosure, use of directional terms such as "inner and outer" generally refers to the inner and outer of the corresponding structural profile, unless stated to the contrary.
As shown in fig. 1 to 5, the present disclosure provides a permanent magnet motor, including a rotor 1 and a stator 2 sleeved outside the rotor 1, where the stator 2 is formed with armature teeth 21 extending toward the rotor 1, the armature teeth 21 are used to wind a coil (not shown), a gap is formed between an outer circumferential surface of the rotor 1 and the armature teeth 21, the rotor 1 has a plurality of arc segments 11 and a plurality of transition segments 12, the plurality of arc segments 11 and the plurality of transition segments 12 are all arranged in a staggered manner along a circumferential direction of the rotor 1, and each transition segment 12 is connected between two adjacent arc segments 11, so that the plurality of arc segments 11 and the plurality of transition segments 12 jointly define the outer circumferential surface of the rotor 1, a center a of the arc segment 11 does not coincide with a rotation center B of the rotor 1, that is, a center a of the arc segment 11 is eccentric to the rotation center B of the rotor 1.
In the prior art, the stator 2 has a generally circular cross section, the outer circumferential surface of the rotor 1 has a generally circular shape, and the center of the circle and the center B of rotation of the stator 2 both coincide with the center B of rotation of the rotor 1, so that the distance between each point on the outer circumferential surface of the rotor 1 and the armature teeth 21 is equal. In the present disclosure, the outer circumferential surface of the torque is formed by a plurality of arc segments 11 and a plurality of transition segments 12, and the center a of the arc segment 11 is eccentric to the rotation center B of the rotor 1, so that the distance between each point on the arc segment 11 and the armature teeth 21 is not equal, when the permanent magnet motor operates, the rotor 1 rotates relative to the stator 2, and when the arc segment 11 and the transition segment 12 adjacent thereto rotate relative to the armature teeth 21, the distance between the arc segment 11 and the transition segment 12 and the armature teeth 21 changes within a certain range. That is, in the present disclosure, the gap (i.e., air gap) between the outer circumferential surface of the rotor 1 and the armature teeth 21 is a non-uniform gap capable of improving an air gap flux density waveform, reducing harmonics in electromotive force, and further weakening cogging torque, reducing motor vibration and noise. In addition, two adjacent circular arc sections 11 are connected through the transition section 12, can make the distance between the outer peripheral face of rotor 1 and the armature tooth 21 gently change in certain extent, avoid the distance between certain point on the outer peripheral face of rotor 1 and armature tooth 21 to take place the sudden change, lead to motor vibration.
Further, the distance between the circular arc section 11 and the armature teeth 21 is 0.2mm-1mm, that is, the distance between each point on the circular arc section 11 and the armature teeth 21 is 0.2mm-1mm, so that the gap between the circular arc section 11 and the armature teeth 21 can keep the cogging torque in a reasonable range, and the vibration and noise of the motor can be weakened as much as possible. Alternatively, the cross section of the inner bore of the stator 2 may be circular, that is, the side of the armature teeth 21 close to the rotor 1 is formed into a circular arc having the center of the circle B of the rotor 1.
In order to facilitate determining the eccentric distance between the circle center a of the circular arc segment 11 and the rotation center B of the rotor 1, and further facilitate the production and manufacturing of the rotor 1, in an embodiment provided by the present disclosure, as shown in fig. 2, a plurality of magnetic poles (not shown) are disposed in the rotor 1, and a distance e between the circle center a of the circular arc segment 11 and the rotation center B of the rotor 1 and the number n of the magnetic poles may satisfy the following relation: e-1.0 < e cos (180/n) < e, wherein n is an even number greater than or equal to 4. Taking fig. 2 as an example, fig. 2 shows a rotor 1 for a 6-pole motor, the rotor 1 is provided with 6V-shaped mounting grooves 13 with openings facing the outer peripheral surface of the rotor 1 for mounting V-shaped magnetic poles, and the number n of the magnetic poles of the 6-pole motor is 6. After the distance range between the circle center A of the arc section 11 and the rotation center B of the rotor 1 is determined according to the number of the magnetic poles of the motor and the relational expression, the radius range of the arc section 11 can be determined according to the distance range between the arc section 11 and the armature teeth 21, and therefore the rotor 1 is convenient to produce and manufacture.
Alternatively, in an exemplary embodiment provided by the present disclosure, as shown in fig. 4, the transition section 12 is formed as a straight transition section 12, that is, the cross section of the transition section 12 is a straight line, and the circular arc section 11 and the straight transition section 12 are connected in a smooth transition manner, so that during the rotation of the rotor 1 relative to the stator 2, the gap between the armature teeth 21 and the circular arc section 11 can be smoothly transited to the gap between the armature teeth 21 and the transition section 12, and a sudden change of the gap value between the outer circumferential surface of the rotor 1 and the armature teeth 21 is avoided, thereby causing the motor to vibrate and generating noise.
In addition, in order to facilitate installation of the magnetic poles and improve the magnetic flux of each magnetic pole in the rotor 1, as shown in fig. 1 and 2, a plurality of installation grooves 13 for installing the magnetic poles are formed on the rotor 1, the installation grooves 13 are arranged at intervals along the circumferential direction of the rotor 1, the plurality of arc sections 11 correspond to the installation grooves 13 one to one, each installation groove 13 comprises a first part 131 and a second part 132, and the first part 131 and the second part 132 form a V-shaped structure with an opening facing the outer circumferential surface of the rotor 1, so that the V-shaped magnetic poles can be installed in the V-shaped installation grooves 13, the V-shaped magnetic poles can improve the magnetic flux of each magnetic pole in the rotor 1, the V-shaped magnetic poles can improve the power of the motor for the same volume of the motor, and the V-shaped magnetic poles can reduce the volume and reduce the weight of the motor for the same power of the motor.
Further, as shown in fig. 2 and 3, the first portion 131 and the second portion 132 of the mounting groove 13 are not communicated with each other, so that a side portion of the first portion 131 and a side portion of the second portion 132 together define the first magnetic isolation bridge 14 between the first portion 131 and the second portion 132. That is, the V-shaped pole may be comprised of two parts, for example, two magnetic strips, one magnetic strip being housed in the first part 131 and the other magnetic strip being housed in the second part 132. Through setting up first magnetism bridge 14, on the one hand can avoid the magnetic pole magnetic leakage coefficient too big and lead to the utilization ratio of magnetic pole to hang down excessively, on the other hand, because at rotor 1 pivoted in-process, the magnetic pole can receive the centrifugal force that makes its orientation remove towards the direction of the centre of rotation B who keeps away from rotor 1, and first magnetism bridge 14 can improve the structural strength of mounting groove 13, make the magnetic pole be restricted in mounting groove 13 all the time at rotor 1's rotation in-process, avoid the magnetic pole to destroy rotor 1's structure and shape, thereby lead to rotor 1 to damage.
The size of the first magnetic isolation bridge 14 may be set according to the size of the mounting groove 13, alternatively, as shown in fig. 3, the length L1 of the first magnetic isolation bridge 14 may be 1.5mm-2mm so that the first magnetic isolation bridge 14 can isolate the first part 131 and the second part 132 of the mounting groove 13, and the width L2 of the first magnetic isolation bridge 14 may be 0.5mm-0.7mm so as to play a role in limiting leakage flux and improve structural strength of the mounting groove 13 and the rotor 1, where the length L1 of the first magnetic isolation bridge 14 refers to the size of the first magnetic isolation bridge 14 in the radial direction of the rotor 1, and the width L2 of the first magnetic isolation bridge 14 refers to the distance between the side of the first part 131 and the side of the second part 132 constituting the first magnetic isolation bridge 14.
Further, as shown in fig. 2 and 4, each circular arc segment 11 is located between the first portion 131 and the second portion 132 of the corresponding mounting groove 13, so that, in two adjacent mounting grooves 13, a side portion of the first portion 131 of one mounting groove 13 away from the rotation center B of the rotor 1 and a side portion of the second portion 132 of the other mounting groove 13 away from the rotation center B of the rotor 1 are both disposed opposite to the transition section 12 and define a second magnetic isolation bridge 15 together with the transition section 12. That is, in two adjacent mounting grooves 13, a side portion of the first portion 131 of one mounting groove 13 away from the rotation center B of the rotor 1 is spaced from the outer circumferential surface of the rotor 1, and a projection on the outer circumferential surface of the rotor 1 is located in the transition section 12, a side portion of the second portion 132 of the other mounting groove 13 away from the rotation center B of the rotor 1 is also spaced from the outer circumferential surface of the rotor 1, and a projection on the outer circumferential surface of the rotor 1 is also located in the transition section 12, so that a side portion of the first portion 131 of one mounting groove 13 away from the rotation center B of the rotor 1 and a side portion of the second portion 132 of the other mounting groove 13 away from the rotation center B of the rotor 1 can define the second magnetic isolation bridge 15 together with the transition section 12. The second magnetic isolation bridge 15 can play a role in strengthening the structural strength of the rotor 1, and avoids deformation of the rotor 1 caused by the magnetic poles under the action of centrifugal force in the rotation process of the rotor 1.
Alternatively, as shown in FIG. 4, the length L3 of the second magnetic isolating bridge 15 may be equal to the length of the transition section 12 to facilitate the production and manufacture of the rotor 1. for example, the length L3 of the second magnetic isolating bridge 15 may be greater than 3mm to ensure that the structural strength of the rotor 1 can be improved.
In order to facilitate the motor to convert the electric energy into the mechanical energy for outputting, as shown in fig. 1 and fig. 2, a first through hole 16 may be formed in the rotor 1, the first through hole 16 is used for installing an output shaft of the rotor 1, and a circle center of the first through hole 16 coincides with a rotation center B of the rotor 1. In addition, a plurality of second through holes 17 may be formed in the rotor 1, and on one hand, the second through holes 17 may be used to reduce the mass of the rotor 1 and to reduce the weight of the rotor 1, and on the other hand, when the permanent magnet motor is used in a compressor, the second through holes 17 may be used to allow gas in the compressor to pass therethrough.
In addition, the rotor 1 may be configured as a centrosymmetric structure, so as to ensure that the rotor 1 can stably rotate around the rotation center B thereof during the rotation process, and no offset, deflection or the like occurs, thereby causing the motor to vibrate.
In order to facilitate heat dissipation of the permanent magnet motor, as shown in fig. 1 and 5, a plurality of heat dissipation grooves 22 are formed on the outer circumferential surface of the stator 2, the plurality of heat dissipation grooves 22 are arranged at intervals in the circumferential direction of the stator 2, and the area of the outer circumferential surface of the stator 2 can be increased by the plurality of heat dissipation grooves 22, so that the heat dissipation area and the heat dissipation efficiency are improved.
According to another aspect of the present disclosure, there is provided a compressor including the permanent magnet motor described above.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A permanent magnet motor is characterized by comprising a rotor (1) and a stator (2) sleeved outside the rotor (1), the stator (2) is provided with armature teeth (21) extending towards the rotor (1), a gap is arranged between the peripheral surface of the rotor (1) and the armature teeth (21), the rotor (1) is provided with a plurality of circular arc sections (11) and a plurality of transition sections (12), the circular arc sections (11) and the transition sections (12) are arranged in a staggered mode along the circumferential direction of the rotor (1), and each transition section (12) is connected between two adjacent circular arc sections (11), so that the plurality of circular arc sections (11) and the plurality of transition sections (12) jointly define the outer circumferential surface of the rotor (1), the circle center (A) of the arc section (11) is not coincident with the rotation center (B) of the rotor (1).
2. A permanent magnet machine according to claim 1, characterized in that the distance between the circular arc segment (11) and the armature teeth (21) is 0.2-1 mm.
3. The permanent magnet motor according to claim 1 or 2, wherein a plurality of magnetic poles are arranged in the rotor (1), and the distance e between the circle center (A) of the circular arc section (11) and the rotation center (B) of the rotor (1) and the number n of the magnetic poles satisfy the following relation:
e-1.0 < e cos (180/n) < e, wherein n is an even number greater than or equal to 4.
4. The permanent magnet electrical machine according to claim 1, characterized in that the transition section (12) is formed as a straight transition section, and the circular arc section (11) is in smooth transition connection with the straight transition section.
5. The permanent magnet motor according to claim 1, wherein a plurality of mounting grooves (13) for mounting magnetic poles are formed on the rotor (1), the plurality of mounting grooves (13) are arranged at intervals along the circumferential direction of the rotor (1), the plurality of arc sections (11) correspond to the plurality of mounting grooves (13) one by one, each mounting groove (13) comprises a first portion (131) and a second portion (132), and the first portion (131) and the second portion (132) form a V-shaped structure with an opening facing the outer circumferential surface of the rotor (1).
6. A permanent magnet electric machine according to claim 5, characterized in that there is no communication between the first part (131) and the second part (132) such that a side of the first part (131) and a side of the second part (132) together define a first magnetic separation bridge (14) between the first part (131) and the second part (132).
7. The permanent magnet motor according to claim 5, characterized in that each circular arc segment (11) is located between the first part (131) and the second part (132) of the corresponding mounting groove (13), so that in two adjacent mounting grooves (13), one side part of the first part (131) of one mounting groove (13) away from the rotation center (B) of the rotor (1) and one side part of the second part (132) of the other mounting groove (13) away from the rotation center (B) of the rotor (1) are both arranged opposite to the transition section (12) and define a second magnetic isolation bridge (15) together with the transition section (12).
8. The permanent magnet electrical machine according to any of claims 1-2, 4-7, characterized in that the rotor (1) is constructed as a centrosymmetric structure.
9. The permanent magnet motor according to claim 1, wherein a plurality of heat dissipation grooves (22) are formed on the outer peripheral surface of the stator (2), and the plurality of heat dissipation grooves (22) are arranged at intervals in the circumferential direction of the stator (2).
10. A compressor, characterized by comprising a permanent magnet motor according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922118885.6U CN210985752U (en) | 2019-11-29 | 2019-11-29 | Permanent magnet motor and compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922118885.6U CN210985752U (en) | 2019-11-29 | 2019-11-29 | Permanent magnet motor and compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210985752U true CN210985752U (en) | 2020-07-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922118885.6U Active CN210985752U (en) | 2019-11-29 | 2019-11-29 | Permanent magnet motor and compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210985752U (en) |
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2019
- 2019-11-29 CN CN201922118885.6U patent/CN210985752U/en active Active
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