CN112234785A - Birotor motor and air conditioning unit - Google Patents

Birotor motor and air conditioning unit Download PDF

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Publication number
CN112234785A
CN112234785A CN202011128261.3A CN202011128261A CN112234785A CN 112234785 A CN112234785 A CN 112234785A CN 202011128261 A CN202011128261 A CN 202011128261A CN 112234785 A CN112234785 A CN 112234785A
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CN
China
Prior art keywords
rotor
stator
mounting groove
motor
dual
Prior art date
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Granted
Application number
CN202011128261.3A
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Chinese (zh)
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CN112234785B (en
Inventor
刘贤义
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
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Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
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Priority to CN202011128261.3A priority Critical patent/CN112234785B/en
Publication of CN112234785A publication Critical patent/CN112234785A/en
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Publication of CN112234785B publication Critical patent/CN112234785B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/02—Machines with one stator and two or more rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H02K1/165—Shape, form or location of the slots
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2786—Outer rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Abstract

The application provides a birotor motor and air conditioning unit. The double-rotor motor comprises a stator, an outer rotor and an inner rotor, wherein the stator is fixedly arranged, the stator forms an outer stator section and an inner stator section which are connected along the height direction of the stator, the outer rotor is arranged on the outer side of the outer stator section, and the inner rotor is arranged on the inner side of the inner stator section. By applying the technical scheme of the invention, the stack height of the outer rotor with larger radius can be increased only, the increased cost is less, but the increased rotational inertia is obvious. The rotary inertia of the motor is increased, the torque fluctuation of the low-frequency operation of the compressor is reduced, the current fluctuation of the low-frequency operation is reduced, the current harmonic content is reduced, the rotating speed of the low-frequency operation of the compressor can be more stable, and the efficiency of the low-frequency operation of the compressor is improved.

Description

Birotor motor and air conditioning unit
Technical Field
The invention relates to the technical field of motors, in particular to a double-rotor motor and an air conditioning unit.
Background
The inner motor and the outer motor of a double-rotor in the existing structure have the characteristics of the same number of slot poles and the same axial position of the inner motor and the outer motor, so that the inner motor and the outer motor of the double-rotor often have the following problems:
when the torque fluctuation of the compressor in low-frequency operation is large, the torque fluctuation of the compressor needs to be reduced by increasing the rotational inertia of the motor rotor, the rotational inertia of the rotor is limited by increasing the motors with the same axial positions of the inner motor and the outer motor in the existing structure, the stacking height can be increased only by synchronously increasing the stator and the rotor of the inner motor and the stator, and the cost of the motors is increased.
Disclosure of Invention
The embodiment of the invention provides a double-rotor motor and an air conditioning unit, and aims to solve the technical problem that the rotational inertia of a rotor is limited when the axial positions of an inner motor and an outer motor are the same in the double-rotor motor in the prior art.
The present application provides a birotor motor, including: the stator is fixedly arranged, and an outer stator section and an inner stator section which are connected are formed along the height direction of the stator; the outer rotor is arranged on the outer side of the outer stator section; an inner rotor disposed inside the inner stator segment.
In one embodiment, the outer stator segment and the inner stator segment are radially offset and connected by a stator connection segment.
In one embodiment, the radial dimension of the outer stator segment is larger than the radial dimension of the inner stator segment.
In one embodiment, the outer stator segment is higher than the inner stator segment.
In one embodiment, the bottom of the outer rotor is connected to and flush with the bottom of the inner rotor.
In one embodiment, the dual rotor motor includes a housing, a stator fixedly connected to the housing, and an outer rotor and an inner rotor rotatably mounted within the housing.
In one embodiment, the double-rotor motor further includes a rotating shaft installed at a rotation center of the inner rotor.
In one embodiment, an outer winding mounting groove is formed at an outer side of the outer stator segment, an inner winding mounting groove is formed at an inner side of the inner stator segment, and the number of poles of the outer winding mounting groove is not equal to the number of poles of the inner winding mounting groove.
In one embodiment, the number of poles of the outer winding mounting groove is greater than the number of poles of the inner winding mounting groove.
In one embodiment, the inner side of the outer rotor is provided with inner magnetic steel and the outer side of the inner rotor is provided with outer magnetic steel.
In one embodiment, the inner side of the outer rotor is provided with an inner mounting groove, the inner magnetic steel is mounted in the inner mounting groove, and the inner magnetic steel is flush with the inner side of the outer rotor; and/or the outer side of the inner rotor is provided with an outer mounting groove, the outer magnetic steel is mounted in the outer mounting groove, and the outer magnetic steel is level with the outer side of the inner rotor.
In one embodiment, the outer magnet is built into the inner rotor.
The application also provides an air conditioning unit, which comprises the double-rotor motor, wherein the double-rotor motor is the double-rotor motor.
In the above embodiment, only the stack height of the outer rotor with a larger radius can be increased, and the increased cost is less, but the increase of the moment of inertia is obvious. The rotary inertia of the motor is increased, the torque fluctuation of the low-frequency operation of the compressor is reduced, the current fluctuation of the low-frequency operation is reduced, the current harmonic content is reduced, the rotating speed of the low-frequency operation of the compressor can be more stable, and the efficiency of the low-frequency operation of the compressor is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a longitudinal sectional view of a double rotor motor according to the related art;
fig. 2 is a schematic longitudinal sectional view of an embodiment of a double-rotor motor according to the present invention;
fig. 3 is a schematic cross-sectional structure of a first embodiment of a double-rotor motor according to the present invention;
fig. 4 is a schematic cross-sectional structure of a second embodiment of a double-rotor motor according to the present invention;
fig. 5 is a schematic cross-sectional structure of a third embodiment of a double-rotor motor according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
As shown in fig. 1, a dual-rotor motor in the prior art includes a housing 5, a stator 3 is fixedly disposed in the housing 5, an inner winding and an outer winding are respectively mounted on an inner side and an outer side of the stator 3, an inner rotor 1 and an outer rotor 2 are correspondingly and respectively mounted in the housing 5, the inner rotor 1 is located on the inner side of the stator 3, the outer rotor 2 is located on the outer side of the stator 3, and the inner rotor 1 is connected to a bottom of the outer rotor 2 and outputs torque through a rotating shaft 4. In the technical scheme, if the problem that the torque fluctuation of the low-frequency operation of the compressor is large is solved, the torque fluctuation of the compressor needs to be reduced by adding the rotational inertia to the inner rotor 1 and the outer rotor 2, and actually, due to the limitation of the diameter size, the increase of the rotational inertia of the rotors of the inner rotor 1 and the outer rotor 2 in the circumferential direction is limited, and only the inner and outer motor stator rotors can be synchronously increased in height, so that the cost of the motor is increased.
In order to solve the above-mentioned technical problem, as shown in fig. 2, the present invention provides an embodiment of a dual-rotor motor including a stator, an outer rotor 20 and an inner rotor 10, the stator being fixedly disposed, the stator forming an outer stator section 40 and an inner stator section 30 connected in a height direction thereof, the outer rotor 20 being disposed at an outer side of the outer stator section 40, and the inner rotor 10 being disposed at an inner side of the inner stator section 30.
In the prior art, the formula for calculating the moment of inertia of a rotating member is as follows: j is m r, J is moment of inertia, m is rotor mass, r is rotor radius of rotation, when m needs to be increased to increase moment of inertia, the material cost of the stator and the inner rotor of the double-rotor motor with the same structure in the axial position of the existing structure is also increased, but the increase of the moment of inertia brought by the unit increase cost is limited. By applying the technical scheme of the invention, the stack height of the outer rotor 20 with the larger radius r can be increased, the increased cost is less, but the increased rotational inertia is obvious. The rotary inertia of the motor is increased, the torque fluctuation of the low-frequency operation of the compressor is reduced, the current fluctuation of the low-frequency operation is reduced, the current harmonic content is reduced, the rotating speed of the low-frequency operation of the compressor can be more stable, and the efficiency of the low-frequency operation of the compressor is improved. The rotary inertia of the motor is increased to the maximum extent on the premise of saving the overall material cost of the motor, and the torque fluctuation of the low-frequency operation of the compressor is improved.
Optionally, in the technical solution of the present embodiment, the outer stator segment 40 and the inner stator segment 30 are staggered in the radial direction and connected by a stator connection segment.
In the solution of the present embodiment, the radial dimension of the outer stator segment 40 is larger than the radial dimension of the inner stator segment 30. As an alternative embodiment, the radial dimension of the outer stator segment 40 may be smaller than the radial dimension of the inner stator segment 30.
In the solution of the present embodiment, the outer stator segment 40 is higher than the inner stator segment 30. As an alternative embodiment, it is also possible to let the outer stator segment 40 be lower than the inner stator segment 30.
As shown in fig. 2, in the present embodiment, the bottom of the outer rotor 20 is flush with and connected to the bottom of the inner rotor 10.
As shown in fig. 2, in the present embodiment, the dual-rotor motor includes a housing 50, the stator is fixedly connected to the housing 50, and the outer rotor 20 and the inner rotor 10 are rotatably installed in the housing 50. Preferably, the dual rotor motor further includes a rotating shaft 60, and the rotating shaft 60 is installed at the rotation center of the inner rotor 10.
In the prior art, the number of the slots of the inner motor and the outer motor of the conventional dual-rotor motor is the same, the debugging can only depend on the electrical frequency of the controller, when the compressor needs a very high rotating speed in operation, the electrical frequency can only be increased, but the iron loss of the motor can be increased due to the increase of the electrical frequency, so that the efficiency of the motor of the compressor is reduced when the compressor operates at a high speed, and the energy efficiency of the compressor is reduced. Therefore, in order to improve the above technical problem, in the technical solution of the present invention, as a preferred embodiment, as shown in fig. 3, an outer winding mounting groove 41 is formed at an outer side of the outer stator segment 40, an inner winding mounting groove 31 is formed at an inner side of the inner stator segment 30, and the number of poles of the outer winding mounting groove 41 is greater than the number of poles of the inner winding mounting groove 31. When the compressor needs to run at a high speed, the electric frequency output by the controller can be reduced by adopting a motor driving mode with a small number of motor poles, and the iron loss of the motor can be reduced.
As another alternative, the number of poles of the outer winding mounting groove 41 may be smaller than the number of poles of the inner winding mounting groove 31. In the above two embodiments, the number of poles of the outer winding mounting groove 41 is not equal to the number of poles of the inner winding mounting groove 31, so that the motor with a small number of poles is used for driving in high-frequency operation, thereby reducing the electrical frequency output by the controller. The stator winding driving only the inner winding mounting groove 31 or the stator winding driving only the outer winding mounting groove 41 at any time is rotated in synchronization at any time since the bottom of the outer rotor 20 is connected to and flush with the bottom of the inner rotor 10.
As an alternative embodiment, as shown in fig. 3, the inner side of the outer rotor 20 is provided with inner magnetic steel 21 and the outer side of the inner rotor 10 is provided with outer magnetic steel 11.
More preferably, as shown in fig. 4, as another alternative embodiment, an inner mounting groove is formed on the inner side of the outer rotor 20, the inner magnet steel 21 is mounted in the inner mounting groove, the inner magnet steel 21 is flush with the inner side of the outer rotor 20, an outer mounting groove is formed on the outer side of the inner rotor 10, the outer magnet steel 11 is mounted in the outer mounting groove, and the outer magnet steel 11 is flush with the outer side of the inner rotor 10. The installation mode can make the installation of magnet steel more stable, reduces the space moreover and occupies. As another alternative embodiment, as shown in fig. 5, the outer magnet 11 may be embedded in the inner rotor 10.
In the technical scheme of the invention, the magnetic steel can be mounted in a surface-mounted manner, a buried manner, a built-in manner or an arbitrary combination manner.
The invention also provides an air conditioning unit which comprises the double-rotor motor, and the double-rotor motor can improve the running stability of the air conditioning unit and improve the running efficiency of the air conditioning unit.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. A dual rotor motor, comprising:
a stator fixedly arranged, the stator forming an outer stator section (40) and an inner stator section (30) connected along its height direction;
an outer rotor (20) disposed outside the outer stator segment (40);
an inner rotor (10) disposed inside the inner stator segment (30).
2. The dual rotor electric machine of claim 1, wherein the outer stator segment (40) and the inner stator segment (30) are radially offset and connected by a stator connection segment.
3. The dual rotor electric machine of claim 2, wherein the radial dimension of the outer stator segment (40) is greater than the radial dimension of the inner stator segment (30).
4. The dual rotor electric machine of claim 1, wherein the outer stator segment (40) is taller than the inner stator segment (30).
5. The double rotor motor according to claim 1, wherein the bottom of the outer rotor (20) is connected and flush with the bottom of the inner rotor (10).
6. The dual rotor motor as claimed in claim 1, comprising a housing (50), the stator being fixedly connected with the housing (50), the outer rotor (20) and the inner rotor (10) being rotatably mounted within the housing (50).
7. The double-rotor motor according to claim 1, further comprising a rotating shaft (60), the rotating shaft (60) being installed at a rotation center of the inner rotor (10).
8. The dual rotor motor as claimed in claim 1, wherein an outer winding mounting groove (41) is formed at an outer side of the outer stator segment (40), an inner winding mounting groove (31) is formed at an inner side of the inner stator segment (30), and the number of poles of the outer winding mounting groove (41) is not equal to the number of poles of the inner winding mounting groove (31).
9. The double-rotor motor according to claim 8, wherein the number of poles of the outer winding mounting groove (41) is greater than the number of poles of the inner winding mounting groove (31).
10. Birotor motor according to claim 1, characterized in that the inner side of the outer rotor (20) is provided with inner magnetic steel (21) and the outer side of the inner rotor (10) is provided with outer magnetic steel (11).
11. The double-rotor motor according to claim 10, wherein the inner side of the outer rotor (20) is provided with an inner mounting groove, the inner magnetic steel (21) is mounted in the inner mounting groove, and the inner magnetic steel (21) is flush with the inner side of the outer rotor (20);
and/or an outer mounting groove is formed in the outer side of the inner rotor (10), the outer magnetic steel (11) is mounted in the outer mounting groove, and the outer magnetic steel (11) is flush with the outer side of the inner rotor (10).
12. The double-rotor motor according to claim 10, wherein the outer magnet (11) is built in the inner rotor (10).
13. An air conditioning unit comprising a dual-rotor motor, characterized in that the dual-rotor motor is the dual-rotor motor of any one of claims 1 to 12.
CN202011128261.3A 2020-10-20 2020-10-20 Birotor motor and air conditioning unit Active CN112234785B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011128261.3A CN112234785B (en) 2020-10-20 2020-10-20 Birotor motor and air conditioning unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011128261.3A CN112234785B (en) 2020-10-20 2020-10-20 Birotor motor and air conditioning unit

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CN112234785A true CN112234785A (en) 2021-01-15
CN112234785B CN112234785B (en) 2022-05-10

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114893400A (en) * 2022-04-22 2022-08-12 蔚来动力科技(合肥)有限公司 Double-rotor electric full-sealed compressor for outputting auxiliary power

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009100571A (en) * 2007-10-17 2009-05-07 Asmo Co Ltd Rotary electric machine
CN101689793A (en) * 2007-04-23 2010-03-31 阿莫泰克有限公司 Stator for bldc motor, bldc motor having double rotors/single stator and vehicle cooler using the same
US20170117784A1 (en) * 2015-10-21 2017-04-27 Mcmaster University Double-rotor switched reluctance machine with segmented rotors
CN107994743A (en) * 2017-12-06 2018-05-04 珠海格力节能环保制冷技术研究中心有限公司 Motor and there is its washing machine
JP2018093602A (en) * 2016-12-01 2018-06-14 トヨタ自動車株式会社 Rotary electric machine
CN111030404A (en) * 2019-12-02 2020-04-17 珠海格力节能环保制冷技术研究中心有限公司 Motor and control method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101689793A (en) * 2007-04-23 2010-03-31 阿莫泰克有限公司 Stator for bldc motor, bldc motor having double rotors/single stator and vehicle cooler using the same
JP2009100571A (en) * 2007-10-17 2009-05-07 Asmo Co Ltd Rotary electric machine
US20170117784A1 (en) * 2015-10-21 2017-04-27 Mcmaster University Double-rotor switched reluctance machine with segmented rotors
JP2018093602A (en) * 2016-12-01 2018-06-14 トヨタ自動車株式会社 Rotary electric machine
CN107994743A (en) * 2017-12-06 2018-05-04 珠海格力节能环保制冷技术研究中心有限公司 Motor and there is its washing machine
CN111030404A (en) * 2019-12-02 2020-04-17 珠海格力节能环保制冷技术研究中心有限公司 Motor and control method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114893400A (en) * 2022-04-22 2022-08-12 蔚来动力科技(合肥)有限公司 Double-rotor electric full-sealed compressor for outputting auxiliary power
CN114893400B (en) * 2022-04-22 2023-10-10 蔚来动力科技(合肥)有限公司 Double-rotor electric fully-sealed compressor for outputting auxiliary power

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