CN110571971B - Magnetic suspension motor with negative pressure air cooling device - Google Patents

Magnetic suspension motor with negative pressure air cooling device Download PDF

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Publication number
CN110571971B
CN110571971B CN201911073364.1A CN201911073364A CN110571971B CN 110571971 B CN110571971 B CN 110571971B CN 201911073364 A CN201911073364 A CN 201911073364A CN 110571971 B CN110571971 B CN 110571971B
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China
Prior art keywords
magnetic bearing
cooling channel
rotor
motor
cooling
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CN201911073364.1A
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CN110571971A (en
Inventor
李永胜
何小宏
朱永新
任伟
李致宇
张婕妤
郑伟
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Shandong Tianrui Heavy Industry Co Ltd
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Shandong Tianrui Heavy Industry Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/161Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08Structural association with bearings
    • H02K7/09Structural association with bearings with magnetic bearings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K9/00Arrangements for cooling or ventilating
    • H02K9/08Arrangements for cooling or ventilating by gaseous cooling medium circulating wholly within the machine casing

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

The invention discloses a magnetic suspension motor with a negative pressure air cooling device, which comprises a rotor, an axial magnetic bearing and a radial magnetic bearing, wherein the rotor, the axial magnetic bearing and the radial magnetic bearing are assembled in the motor; the magnetic suspension motor with the negative pressure air cooling device also comprises a first cooling channel; the inlet end of the first cooling channel is arranged on a shell of the motor, the outlet end of the first cooling channel is communicated with the exhaust end of the motor, and the airflow of the first cooling channel enters from the inlet end of the first cooling channel, passes through the radial magnetic bearing, the rotor and the axial magnetic bearing, flows out from the outlet end of the first cooling channel and is used for cooling the radial magnetic bearing, the rotor and the axial magnetic bearing; the cooling treatment of the invention can be realized by itself without additional power supply, thereby reducing the energy consumption of the magnetic suspension motor and having better cooling effect.

Description

Magnetic suspension motor with negative pressure air cooling device
Technical Field
The invention relates to the technical field of motor equipment, in particular to a magnetic suspension motor with a negative pressure air cooling device.
Background
The magnetic suspension motor is manufactured based on the theory of the magnetic suspension technology, has the characteristics of high efficiency and high power, and simultaneously causes higher temperature rise of the magnetic suspension motor. If a heat dissipation system is not additionally arranged, the temperature rise at the winding is too high, so that the permanent magnet of the rotor is demagnetized, and the normal use of the magnetic suspension motor is influenced.
The cooling treatment of the magnetic suspension motor usually adopts an air cooling mode, an impeller is installed at one end of a rotor, air holes are formed in a shell, the rotor rotates to drive the impeller to rotate, external air is compressed into the motor shell by means of blades on the impeller when the impeller rotates and is led out from the air holes of the motor shell, and heat in the motor shell is taken away by the air in the flowing process, so that the purpose of cooling the magnetic suspension motor is achieved, but the blades are required to do work on the air in the cooling method, the temperature of the air can be increased in the working process, and the cooling effect is not obvious.
Or increase the air-blower in motor casing venthole department, blow in cold wind through the air-blower to motor casing venthole promptly, cold wind flows out through the clearance of rotor with motor casing, but this kind of cooling method needs additionally provide power to the air-blower to the energy consumption of magnetic suspension motor has been improved.
Disclosure of Invention
In order to solve the above problems in the prior art, a magnetic suspension motor with a negative pressure air cooling device is provided to solve the problems that the temperature rise of the magnetic suspension motor is high and power needs to be additionally provided to cool down in the prior art.
According to one aspect of the invention, a magnetic levitation motor with a negative pressure air cooling device is provided, which comprises a rotor assembled in the motor, an axial magnetic bearing and a radial magnetic bearing; the magnetic suspension motor with the negative pressure air cooling device also comprises a first cooling channel;
the inlet end of the first cooling channel is arranged on the shell of the motor, the outlet end of the first cooling channel is communicated with the exhaust end of the motor, and the airflow of the first cooling channel enters from the inlet end of the first cooling channel, passes through the radial magnetic bearing, the rotor and the axial magnetic bearing, flows out from the outlet end of the first cooling channel, and is used for cooling the radial magnetic bearing, the rotor and the axial magnetic bearing.
Wherein the radial magnetic bearings comprise a first radial magnetic bearing and a second radial magnetic bearing;
an axial magnetic bearing end cover and an axial magnetic bearing rotor disc are assembled on the axial magnetic bearing; along the axial direction of the rotor, air holes are formed in a rotor disc of the axial magnetic bearing;
the inlet end of the first cooling channel, the gap between the magnetic bearing seat and the auxiliary bearing seat of the first radial magnetic bearing, the gap between the first radial magnetic bearing and the rotor, the gap between the stator and the rotor in the motor, the gap between the second radial magnetic bearing and the rotor, the air holes and the outlet end of the first cooling channel are communicated in sequence to form the first cooling channel.
The magnetic suspension motor with the negative pressure air cooling device further comprises a second cooling channel;
the outlet end of the second cooling channel is communicated with the first cooling channel, the inlet end of the second cooling channel is arranged on a magnetic bearing seat of the second radial magnetic bearing, and the airflow of the second cooling channel enters from the inlet end of the second cooling channel, passes through the axial magnetic bearing, flows out from the outlet end of the second cooling channel and is cooled by the axial magnetic bearing.
Wherein, along the radial direction of the rotor, a first gap is provided between the axial magnetic bearing end cover and the axial magnetic bearing rotor disk, and the inlet end of the second cooling channel, the first gap and the outlet end of the second cooling channel form the second cooling channel.
The outer side of the stator is provided with a stator mounting seat;
one end of the stator mounting seat is fixedly connected with a magnetic bearing seat of the second radial magnetic bearing, an air flow channel is arranged between the stator mounting seat and the inner wall of the shell of the motor, the air flow channel extends along the axial direction of the rotor, the outlet end of the air flow channel is communicated with the first cooling channel, and the air flow of the air flow channel passes through the rotor and the second radial magnetic bearing and is used for cooling the rotor and the second radial magnetic bearing;
the inlet end of the air flow channel is arranged on the shell of the motor, and the air inlet at the inlet end of the air flow channel is arranged along the radial direction of the rotor.
The stator mounting seat is provided with a vent hole, and the air flow in the air flow channel passes through the second radial magnetic bearing through the vent hole, is communicated with the first cooling channel and is cooled by the second radial magnetic bearing.
Wherein, the air inlet and the air vent are arranged in the same direction and in different axes.
Wherein the hole diameter of the air inlet hole is larger than that of the vent hole.
The magnetic suspension motor with the negative pressure air cooling device also comprises an impeller cover; the exhaust end is arranged on the impeller cover.
The magnetic suspension motor with the negative pressure air cooling device can realize the following beneficial effects: the cooling treatment of the invention can be realized by self-cooling without additional power supply, thereby reducing the energy consumption of the magnetic suspension motor and having better cooling effect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. In the drawings, like reference numerals are used to indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the invention. For a person skilled in the art, other figures can be derived from these figures without inventive effort.
FIG. 1 is a cross-sectional view taken along an axial direction of a motor and an air flow direction schematic diagram as provided in one embodiment of the present application;
FIG. 2 is an enlarged view of the axial magnetic bearing shown in FIG. 1 and given in one embodiment of the present application;
FIG. 3 is an enlarged view of FIG. 1 at A in one embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The application provides a magnetic suspension motor with a negative pressure air cooling device, which comprises a rotor 1, an axial magnetic bearing 2 and a radial magnetic bearing 3, wherein the rotor, the axial magnetic bearing and the radial magnetic bearing are assembled in the motor; the magnetic suspension motor with the negative pressure air cooling device also comprises a first cooling channel 4; the inlet end of the first cooling channel 4 is arranged on a shell 8 of the motor, the outlet end of the first cooling channel 4 is communicated with the exhaust end 5 of the motor, and the airflow of the first cooling channel 4 enters from the inlet end of the first cooling channel 4, passes through the radial magnetic bearing 3, the rotor 1 and the axial magnetic bearing 2, flows out from the outlet end of the first cooling channel 4, and is used for cooling the radial magnetic bearing 3, the rotor 1 and the axial magnetic bearing 2.
The utility model provides a take negative pressure air cooling device's magnetic suspension motor is when using, utilize first radial magnetic bearing 31 and the radial magnetic bearing 32 of second to suspend rotor 1 earlier, then exciting current gives the stator winding power supply, it is rotatory to drive rotor 1, thereby rotor 1 rotates and drives the impeller rotation, the air in with motor casing 8 through the blade during impeller rotation passes through exhaust end 5 on the impeller cover 9 and derives to the external world, thereby negative pressure environment in the motor casing 8 has been built, ensure the entry end of wind from first cooling channel 4 on the casing 8, the entry end of 6 entry ends of second cooling channel and air runner 71 gets into inside the motor, realize the cooling of whole magnetic suspension motor, the cooling effect is better.
The magnetic suspension motor with the negative pressure air cooling device is described in detail below with reference to the accompanying drawings.
Fig. 1 illustrates a cross-sectional view taken along the axial direction of the motor and a schematic view of the air flow direction. The magnetic suspension motor with the negative pressure air cooling device comprises a rotor 1, an axial magnetic bearing 2, a radial magnetic bearing 3 and a first cooling channel 4 which are assembled in the motor.
In an embodiment of the present application, an inlet end of the first cooling channel 4 is disposed along an axial direction of the rotor 1, the inlet end of the first cooling channel 4 is disposed on the housing 8 of the motor, and the inlet end of the first cooling channel 4 is composed of a plurality of first air inlets 41, the plurality of first air inlets 41 are disposed along a circumferential direction of the housing 8 of the motor, and an outlet end of the first cooling channel 4 is communicated with the exhaust end 5 of the motor, as shown in fig. 1, the airflow of the first cooling channel 4 enters from the inlet end of the first cooling channel 4, passes through the radial magnetic bearing 3, the rotor 1 and the axial magnetic bearing 2, and flows out from the outlet end of the first cooling channel 4 to cool the radial magnetic bearing 3, the rotor 1 and the axial magnetic bearing 2.
Further, the radial magnetic bearing 3 comprises a first radial magnetic bearing 31 and a second radial magnetic bearing 32, and the air flow of the first cooling channel 4 enters from the inlet end of the first cooling channel 4 and passes through the first radial magnetic bearing 31 and a part of the rotor 1, so that the first cooling channel 4 mainly aims at cooling the first radial magnetic bearing 31 and a part of the rotor 1.
FIG. 2 illustrates an enlarged view of the axial magnetic bearing.
An axial magnetic bearing end cover 21 and an axial magnetic bearing rotor disc 22 are assembled on the axial magnetic bearing 2; the axial magnetic bearing rotor disc 22 is provided with air holes 221 along the axial direction of the rotor 1, and as shown in fig. 2, the air holes 221 are arranged in parallel with the axial direction of the rotor 1.
The inlet end of the first cooling channel 4, the gap between the magnetic bearing holder 311 and the auxiliary bearing holder 312 of the first radial magnetic bearing 31, the gap between the first radial magnetic bearing 31 and the rotor 1, the gap between the stator and the rotor 1 in the motor, the gap between the second radial magnetic bearing 32 and the rotor 1, the air vent 221, and the outlet end of the first cooling channel 4 are sequentially communicated to form the first cooling channel 4.
In the present embodiment, the magnetic levitation motor with the negative pressure air cooling device further comprises a second cooling channel 6; the outlet end of the second cooling channel 6 is communicated with the first cooling channel 4, the inlet end of the second cooling channel 6 is arranged along the radial direction of the rotor 1, the inlet end of the second cooling channel 6 is arranged on the magnetic bearing seat 321 of the second radial magnetic bearing 32, the inlet end of the second cooling channel 6 is composed of a plurality of second air inlet holes 61, the plurality of second air inlet holes 61 are arranged along the circumferential direction of the magnetic bearing seat 321 of the second radial magnetic bearing 32, the airflow of the second cooling channel 6 enters from the inlet end of the second cooling channel 6 and passes through the axial magnetic bearing 2, flows out from the outlet end of the second cooling channel 6, and is used for cooling the axial magnetic bearing 2.
In the radial direction of the rotor 1, there is a first gap between the axial magnetic bearing end cover 21 and the axial magnetic bearing rotor disk 22, and the inlet end of the second cooling channel 6, the first gap and the outlet end of the second cooling channel 6 form the second cooling channel 6. As shown in fig. 2, there are two axial magnetic bearings 2, each axial magnetic bearing 2 is provided with an axial magnetic bearing stator core 23 at the outer side, and are respectively sealed by respective axial magnetic bearing end covers 21, the two axial magnetic bearing end covers 21 are arranged oppositely, and a second gap is arranged between the two axial magnetic bearing end covers, and the axial magnetic bearing rotor disk 22 is disposed between two axial magnetic bearing end caps 21, the gap between each axial magnetic bearing end cap 21 and the axial magnetic bearing rotor disk 22 being a first gap, the gas flow of figure 2 being shown in the direction of arrow flow, when the airflow of the second cooling channel 6 enters from the inlet end of the second cooling channel 6, it passes through the second gap, the first gap and the air hole 221 in sequence, and flows out from the outlet end of the second cooling channel 6 to be merged with the first cooling channel 4 and discharged to the exhaust end 5 of the motor, and the second cooling channel 6 mainly cools the axial magnetic bearing 2.
In the present embodiment, a stator mounting seat 7 is mounted on the outer side of the stator; one end of the stator mounting seat 7 is fixedly connected with the magnetic bearing seat 321 of the second radial magnetic bearing 32, the other end of the stator mounting seat is arranged in a suspended manner and communicated with the interior of the motor, an air flow channel 71 is arranged between the stator mounting seat 7 and the inner wall of the shell 8 of the motor, the air flow channel 71 extends along the axial direction of the rotor 1, the outlet end of the air flow channel 71 is communicated with the first cooling channel 4, the air flow in the figure 1 is shown in the flow direction of an arrow, and the air flow in the air flow channel 71 passes through the rotor 1 and the second radial magnetic bearing 32, mainly the rotor 1 and the second radial magnetic bearing 32 for.
Further, the inlet end of the air flow passage 71 is opened in the housing 8 of the motor, the air intake holes 711 at the inlet end of the air flow passage 71 are arranged in the radial direction of the rotor 1, and the air intake holes 711 are provided in plural and arranged along the circumferential direction of the housing 8 of the motor.
In the present embodiment, as shown in fig. 1, the stator mounting base 7 is provided with a plurality of vent holes 712, and the plurality of vent holes 712 are arranged along the radial direction of the rotor 1, and the air flow in the air flow channel 71 passes through the second radial magnetic bearing 32 through the vent holes 712 and is communicated with the first cooling channel 4, mainly for the second radial magnetic bearing 32 to assist cooling.
Fig. 3 illustrates an enlarged view at a in fig. 1. The air inlet holes 711 and the air vent holes 712 are arranged in the same direction and are not arranged coaxially, namely, are arranged in a staggered manner. After the airflow enters from the inlet end of the air flow passage 71, in order to prevent a large amount of airflow from directly flowing into the vent hole 712, the diameter of the vent hole 712 is reduced, the hole diameter of the intake hole 711 is larger than that of the vent hole 712, and preferably, the diameter ratio of the intake hole 711 to the vent hole 712 is 2: 1-5: 1.
in this embodiment, the magnetic levitation motor with the negative pressure air cooling device further comprises an impeller cover 9; the exhaust end 5 is arranged on the impeller cup 9. The second cooling channel 6 and the air flow channel 71 are merged with the first cooling channel 4, and after being cooled by the first radial magnetic bearing 31, the rotor 1, the stator, the second radial magnetic bearing 32 and the axial magnetic bearing 2, the cooled air passes through the impeller and is discharged into the impeller cover 9 through the exhaust hole on the exhaust end 5, the impeller is driven to rotate by the rotation of the rotor 1, the air which does not have the cooling effect is led out from the exhaust hole on the exhaust end 5, the circulation is repeated, the energy consumption of the motor consumed by an external power source is not increased, and the cooling effect is better by respective cooling.
The above-described aspects may be implemented individually or in various combinations, and such variations are within the scope of the present invention.
It is to be noted that, in this document, the terms "comprises", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, so that an article or apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.
The above embodiments are merely to illustrate the technical solutions of the present invention and not to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and it should be understood that the present invention is to be covered by the appended claims.

Claims (4)

1. A magnetic suspension motor with a negative pressure air cooling device comprises a rotor, an axial magnetic bearing and a radial magnetic bearing which are assembled in the motor; the magnetic suspension motor with the negative pressure air cooling device is characterized by further comprising a first cooling channel;
the inlet end of the first cooling channel is arranged on the shell of the motor, the outlet end of the first cooling channel is communicated with the exhaust end of the motor, and the airflow of the first cooling channel enters from the inlet end of the first cooling channel, passes through the radial magnetic bearing, the rotor and the axial magnetic bearing, flows out from the outlet end of the first cooling channel, and cools the radial magnetic bearing, the rotor and the axial magnetic bearing;
the radial magnetic bearings comprise a first radial magnetic bearing and a second radial magnetic bearing;
an axial magnetic bearing end cover and an axial magnetic bearing rotor disc are assembled on the axial magnetic bearing; along the axial direction of the rotor, air holes are formed in a rotor disc of the axial magnetic bearing;
the inlet end of the first cooling channel, the gap between the magnetic bearing seat and the auxiliary bearing seat of the first radial magnetic bearing, the gap between the first radial magnetic bearing and the rotor, the gap between the stator and the rotor in the motor, the gap between the second radial magnetic bearing and the rotor, the air vent and the outlet end of the first cooling channel are communicated in sequence to form the first cooling channel;
a stator mounting seat is arranged on the outer side of the stator;
one end of the stator mounting seat is fixedly connected with a magnetic bearing seat of the second radial magnetic bearing, an air flow channel is arranged between the stator mounting seat and the inner wall of the shell of the motor, the air flow channel extends along the axial direction of the rotor, the outlet end of the air flow channel is communicated with the first cooling channel, and the air flow of the air flow channel passes through the rotor and the second radial magnetic bearing and is used for cooling the rotor and the second radial magnetic bearing;
the inlet end of the air flow channel is arranged on the shell of the motor, and an air inlet at the inlet end of the air flow channel is arranged along the radial direction of the rotor;
the stator mounting seat is provided with a vent hole, and the air flow in the air flow channel passes through the second radial magnetic bearing through the vent hole, is communicated with the first cooling channel and is cooled by the second radial magnetic bearing;
the air inlet hole and the vent hole are arranged in the same direction and are not coaxial;
the hole diameter of the air inlet hole is larger than that of the vent hole.
2. The maglev motor with a negative-pressure air cooling device of claim 1, further comprising a second cooling channel;
the outlet end of the second cooling channel is communicated with the first cooling channel, the inlet end of the second cooling channel is arranged on a magnetic bearing seat of the second radial magnetic bearing, and the airflow of the second cooling channel enters from the inlet end of the second cooling channel, passes through the axial magnetic bearing, flows out from the outlet end of the second cooling channel and is cooled by the axial magnetic bearing.
3. The maglev motor with a negative pressure air cooling device of claim 2, wherein the axial magnetic bearing end cover and the axial magnetic bearing rotor disk have a first gap therebetween in a radial direction of the rotor, and an inlet end of the second cooling channel, the first gap and an outlet end of the second cooling channel form the second cooling channel.
4. The maglev motor with a negative-pressure air cooling device of claim 1, further comprising an impeller cover; the exhaust end is arranged on the impeller cover.
CN201911073364.1A 2019-11-06 2019-11-06 Magnetic suspension motor with negative pressure air cooling device Active CN110571971B (en)

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CN110571971B true CN110571971B (en) 2020-03-03

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CN106849482A (en) * 2017-03-02 2017-06-13 南京航空航天大学 Magnetic suspension motor and its method of work without thrust disc
CN107076211A (en) * 2014-06-27 2017-08-18 热力学公司 Cooling system for magnetic force cod
CN110380569A (en) * 2019-09-12 2019-10-25 山东天瑞重工有限公司 Magnetic suspension motor and air blower

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Publication number Priority date Publication date Assignee Title
CN1666026A (en) * 2003-07-04 2005-09-07 三菱电机株式会社 Magnetic bearing device
CN203482014U (en) * 2013-09-02 2014-03-12 南京磁谷科技有限公司 Magnetic suspension permanent-magnet synchronous high-power high-speed draught fan
CN107076211A (en) * 2014-06-27 2017-08-18 热力学公司 Cooling system for magnetic force cod
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CN106849482A (en) * 2017-03-02 2017-06-13 南京航空航天大学 Magnetic suspension motor and its method of work without thrust disc
CN110380569A (en) * 2019-09-12 2019-10-25 山东天瑞重工有限公司 Magnetic suspension motor and air blower

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Denomination of invention: A magnetic suspension motor with negative pressure air cooling device

Effective date of registration: 20230104

Granted publication date: 20200303

Pledgee: Ping An Bank Co.,Ltd. Weifang Branch

Pledgor: SHANDONG TIANRUI HEAVY INDUSTRY Co.,Ltd.

Registration number: Y2023370000002