CN110571971B - A magnetic levitation motor with negative pressure air cooling device - Google Patents

Abstract

The invention discloses a magnetic levitation motor with a negative pressure air cooling device, comprising a rotor, an axial magnetic bearing and a radial magnetic bearing assembled in the motor; the magnetic levitation motor with a negative pressure air cooling device further comprises a first cooling channel; The inlet end of the first cooling channel is set on the casing 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 and passes through the radial magnetic bearing , the rotor and the axial magnetic bearing flow out from the outlet end of the first cooling channel to cool the radial magnetic bearing, the rotor and the axial magnetic bearing; the cooling process of the present invention can be realized by itself, without additional power supply, reducing the magnetic suspension The energy consumption of the motor and the cooling effect are better.

Description

A magnetic levitation motor with negative pressure air cooling device

technical field

The invention relates to the technical field of motor equipment, in particular to a magnetic levitation motor with a negative pressure air cooling device.

Background technique

The magnetic levitation motor is made based on the theory of magnetic levitation technology, and has the characteristics of high efficiency and high power. At the same time, this also leads to a relatively high temperature rise of the magnetic levitation motor. If the cooling system is not installed, the temperature rise at the winding will be too high, which will cause the permanent magnets of the rotor to demagnetize, thus affecting the normal use of the magnetic levitation motor.

For the cooling treatment of the magnetic levitation motor, the air-cooling method is often used. An impeller is installed at one end of the rotor, and ventilation holes are opened on the shell. In the casing, and it is led out from the ventilation holes of the motor casing, the air takes away the heat in the motor casing during the flow, so as to achieve the purpose of cooling the magnetic levitation motor, but this cooling method requires the blades to do work on the air, The process also increases the temperature of the air, making the cooling effect less pronounced.

Or add a blower to the ventilation hole of the motor housing, that is, blow cold air into the ventilation hole of the motor housing through the blower, and the cold air flows out through the gap between the rotor and the motor housing, but this cooling method requires additional power to the blower , thereby increasing the energy consumption of the magnetic levitation motor.

SUMMARY OF THE INVENTION

In order to solve the above problems in the prior art, a magnetic levitation motor with a negative pressure air cooling device is proposed to solve the problems of the relatively high temperature rise of the magnetic levitation motor and the need for additional power to cool down in the prior art.

According to one aspect of the present invention, a magnetic levitation motor with a negative pressure air cooling device is provided, including a rotor, an axial magnetic bearing and a radial magnetic bearing assembled in the motor; the magnetic levitation motor with a negative pressure air cooling device also includes a first cooling channel;

The inlet end of the first cooling channel is opened on the casing 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 flows from the first cooling channel. The inlet end of the cooling channel enters, passes through the radial magnetic bearing, the rotor and the axial magnetic bearing, and flows out from the outlet end of the first cooling channel, for the radial magnetic bearing, the rotor and the axial magnetic bearing. The axial magnetic bearing is cooled.

Wherein, the radial magnetic bearing includes a first radial magnetic bearing and a second radial magnetic bearing;

The axial magnetic bearing is equipped with an axial magnetic bearing end cover and an axial magnetic bearing rotor disk; along the axial direction of the rotor, the axial magnetic bearing rotor disk is provided with ventilation holes;

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 The gap between the stator and the rotor in the motor, the gap between the second radial magnetic bearing and the rotor, the ventilation hole, and the outlet end of the first cooling channel are sequentially connected to form the first cooling channel.

Wherein, the magnetic levitation motor with negative pressure air cooling device further includes 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 set on the magnetic bearing seat of the second radial magnetic bearing, and the second cooling channel has an inlet end. The airflow enters from the inlet end of the second cooling channel, passes through the axial magnetic bearing, and flows out from the outlet end of the second cooling channel to cool the axial magnetic bearing.

Wherein, along the radial direction of the rotor, there is a first gap between the axial magnetic bearing end cover and the axial magnetic bearing rotor disk, the inlet end of the second cooling channel, the first gap and the outlet end of the second cooling channel to form the second cooling channel.

Wherein, a stator mounting seat is installed on the outer side of the stator;

One end of the stator mounting seat is fixedly connected with the magnetic bearing seat of the second radial magnetic bearing, and an air flow channel is arranged between the stator mounting seat and the inner wall of the casing of the motor, and the air flow channel is along the line. The axial extension of the rotor, and the outlet end of the air flow channel is communicated with the first cooling channel, and the airflow of the air flow channel passes through the rotor and the second radial magnetic bearing, which is the cooling of the rotor and the second radial magnetic bearing;

The inlet end of the air flow channel is opened on the casing of the motor, and the air intake hole at the inlet end of the air flow channel is arranged along the radial direction of the rotor.

Wherein, the stator mounting seat is provided with a ventilation hole, and the air flow in the air flow channel passes through the second radial magnetic bearing from the ventilation hole, and communicates with the first cooling channel, which is the second diameter Cool to the magnetic bearing.

Wherein, the air intake holes and the ventilation holes are arranged in the same direction and not coaxially.

Wherein, the hole diameter of the air inlet hole is larger than the hole diameter of the ventilation hole.

Wherein, the magnetic levitation motor with negative pressure air cooling device further includes an impeller cover; the exhaust end is arranged on the impeller cover.

The magnetic levitation motor with a negative pressure air cooling device in the present invention can achieve the following beneficial effects: the cooling process of the present invention can be realized by self-cooling, no additional power is required, the energy consumption of the magnetic levitation motor is reduced, and the cooling effect is better.

Description of 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 figures, like reference numerals are used to refer to like elements. The drawings in the following description are some, but not all, embodiments of the invention. For those of ordinary skill in the art, other drawings can be obtained from these drawings without creative effort.

1 is a cross-sectional view and a schematic diagram of an air flow along the axial direction of a motor provided in an embodiment of the present application;

FIG. 2 is an enlarged view of the axial magnetic bearing given in an embodiment of the present application shown in FIG. 1;

FIG. 3 is an enlarged view of position A in an embodiment of the present application shown in FIG. 1 .

Detailed ways

In order to make the purposes, 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. It should be noted that, the embodiments in the present application and the features in the embodiments may be arbitrarily combined with each other if there is no conflict.

The present application provides a magnetic levitation motor with a negative pressure air cooling device, including a rotor 1, an axial magnetic bearing 2 and a radial magnetic bearing 3 assembled in the motor; the magnetic levitation motor with a negative pressure air cooling device also includes a first Cooling channel 4; the inlet end of the first cooling channel 4 is provided on the housing 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 flows from the first cooling channel 4 The inlet end of the cooling channel enters, 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.

When the magnetic levitation motor with negative pressure air cooling device provided in this application is in use, the first radial magnetic bearing 31 and the second radial magnetic bearing 32 are used to suspend the rotor 1, and then the excitation current supplies power to the stator windings to drive the rotor. 1 rotates, and the rotor 1 rotates to drive the impeller to rotate. When the impeller rotates, the air in the motor casing 8 is exported to the outside through the exhaust end 5 on the impeller cover 9 through the blades, thereby creating a negative pressure in the motor casing 8. The pressure environment ensures that the wind enters the motor from the inlet end of the first cooling channel 4, the inlet end of the second cooling channel 6 and the inlet end of the air flow channel 71 on the housing 8, so as to realize the cooling of the entire magnetic levitation motor, and the cooling effect is better. .

The magnetic levitation motor with the negative pressure air cooling device will be 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 diagram of the air flow. A magnetic suspension motor with a negative pressure air cooling device includes a rotor 1 , an axial magnetic bearing 2 , a radial magnetic bearing 3 , and a first cooling channel 4 assembled in the motor.

In an embodiment of the present application, the inlet end of the first cooling channel 4 is provided along the axial direction of the rotor 1 , the inlet end of the first cooling channel 4 is provided on the housing 8 of the motor, and the first cooling channel 4 has an inlet end. The inlet end is composed of a plurality of first air inlet holes 41, and the plurality of first air inlet holes 41 are arranged along the circumferential direction of the casing 8 of the motor, and the 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 is shown in the arrow flow direction, 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 from the first cooling channel 4 through the radial magnetic bearing 3, the rotor 1 and the axial magnetic bearing 2. The outlet end flows out to cool the radial magnetic bearing 3 , the rotor 1 and the axial magnetic bearing 2 .

Further, the radial magnetic bearing 3 includes a first radial magnetic bearing 31 and a second radial magnetic bearing 32. 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 first. The bearing 31 and part of the rotor 1 , so the first cooling channel 4 is mainly for cooling the first radial magnetic bearing 31 and part of the rotor 1 .

Figure 2 illustrates an enlarged view of the axial magnetic bearing.

The axial magnetic bearing 2 is equipped with an axial magnetic bearing end cover 21 and an axial magnetic bearing rotor disk 22; along the axial direction of the rotor 1, the axial magnetic bearing rotor disk 22 is provided with ventilation holes 221, as shown in FIG. 2 As shown, the ventilation 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 seat 311 of the first radial magnetic bearing 31 and the auxiliary bearing seat 312, the gap between the first radial magnetic bearing 31 and the rotor 1, the stator in the motor The gap between the rotor 1 , the gap between the second radial magnetic bearing 32 and the rotor 1 , the ventilation hole 221 , and the outlet end of the first cooling channel 4 are sequentially connected to form the first cooling channel 4 .

In this embodiment, the magnetic levitation motor with the negative pressure air cooling device further includes a second cooling channel 6 ; The inlet end of the cooling channel 6, the inlet end of the second cooling channel 6 is opened on the magnetic bearing seat 321 of the second radial magnetic bearing 32, and the inlet end of the second cooling channel 6 is composed of a plurality of second air inlet holes 61, and many The 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 air flow of the second cooling channel 6 enters from the inlet end of the second cooling channel 6 , passes through the axial magnetic bearing 2 , and flows from the second cooling channel 6 . The outlet ends of the two cooling channels 6 flow out to cool the axial magnetic bearing 2 .

Along 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, the inlet end of the second cooling channel 6, the first gap and the outlet of the second cooling channel 6 The ends form second cooling channels 6 . As shown in FIG. 2 , there are also two axial magnetic bearings 2 , and an axial magnetic bearing stator core 23 is installed on the outer side of each axial magnetic bearing 2 , and is sealed by the respective axial magnetic bearing end caps 21 . The two axial magnetic bearing end caps 21 are opposite to each other with a second gap therebetween, and the axial magnetic bearing rotor disk 22 is arranged between the two axial magnetic bearing end caps 21. The gap between the magnetic bearing end cover 21 and the axial magnetic bearing rotor disk 22 is the first gap. The airflow in FIG. 2 is shown in the direction of the arrow. When the end enters, it passes through the second gap, the first gap and the ventilation hole 221 in sequence, and flows out from the outlet end of the second cooling channel 6 and merges with the first cooling channel 4, and is discharged to the exhaust end 5 of the motor, and the second cooling channel 6 is mainly cooling for the axial magnetic bearing 2 .

In this embodiment, a stator mounting seat 7 is installed 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, and the other end is suspended in the air and communicated with the inside of the motor. An air flow channel 71 is provided between the stator mounting seat 7 and the inner wall of the housing 8 of the motor. The air flow channel 71 extends along the axial direction of the rotor 1, and the outlet end of the air flow channel 71 communicates with the first cooling channel 4, as shown in FIG. 1 As shown by the flow direction of the arrow, the airflow in the air flow channel 71 passes through the rotor 1 and the second radial magnetic bearing 32 , mainly for cooling the rotor 1 and the second radial magnetic bearing 32 .

Further, the inlet end of the air flow channel 71 is opened on the housing 8 of the motor, and the air inlet holes 711 at the inlet end of the air flow channel 71 are arranged along the radial direction of the rotor 1. The casing 8 of the motor is arranged circumferentially.

In this embodiment, as shown in FIG. 1 , the stator mounting base 7 is provided with ventilation holes 712 , and along the radial direction of the rotor 1 , there are a plurality of ventilation holes 712 , and the airflow in the air passage 71 is driven by the ventilation holes. 712 passes through the second radial magnetic bearing 32 and communicates with the first cooling channel 4 , mainly assisting the cooling and cooling of the second radial magnetic bearing 32 .

FIG. 3 illustrates an enlarged view at A in FIG. 1 . The air inlet holes 711 and the air holes 712 are arranged in the same direction and not coaxially, that is, arranged in a staggered manner. After the airflow enters from the inlet end of the air channel 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 diameter ratio of the air inlet hole 711 to the air hole 712 is 2:1 to 5:1.

In this embodiment, the magnetic levitation motor with the negative pressure air cooling device further includes an impeller cover 9 ; the exhaust end 5 is arranged on the impeller cover 9 . The second cooling channel 6 and the air flow channel 71 are all merged with the first cooling channel 4. After cooling, the first radial magnetic bearing 31, the rotor 1, the stator, the second radial magnetic bearing 32, and the axial magnetic bearing 2 are respectively cooled. After passing through the impeller, it is discharged side by side into the impeller cover 9, and is discharged from the exhaust hole on the exhaust end 5. The rotation of the rotor 1 drives the impeller to rotate, and the air that no longer has cooling effect is led out from the exhaust hole on the exhaust end 5. , cycle back and forth, neither increasing the energy consumption of the motor consumed by the external power source, but also cooling each other, the cooling effect is better.

The above-described contents can be implemented individually or in various combinations, and these modifications are all within the protection scope of the present invention.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements, but also no Other elements expressly listed, or those inherent to the article or equipment are also included. Without further limitation, an element defined by the phrase "comprising" does not preclude the presence of additional identical elements in the article or device comprising said element.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them, and the present invention is only described in detail with reference to the preferred embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims (4)

1. a magnetic levitation motor with a negative pressure air-cooling device, comprising a rotor, an axial magnetic bearing and a radial magnetic bearing assembled in the motor; it is characterized in that, the magnetic levitation motor with a negative pressure air-cooling device also comprises a a cooling channel; The inlet end of the first cooling channel is opened on the casing of the motor, the outlet end of the first cooling channel is communicated with the exhaust end of the motor, and the air flow of the first cooling channel flows from the first cooling channel. The inlet end of a cooling channel enters, passes through the radial magnetic bearing, the rotor and the axial magnetic bearing, and flows out from the outlet end of the first cooling channel, which is the radial magnetic bearing and the rotor. and cooling of the axial magnetic bearing; The radial magnetic bearing includes a first radial magnetic bearing and a second radial magnetic bearing; The axial magnetic bearing is equipped with an axial magnetic bearing end cover and an axial magnetic bearing rotor disk; along the axial direction of the rotor, the axial magnetic bearing rotor disk is provided with ventilation holes; 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 The gap between the stator and the rotor in the motor, the gap between the second radial magnetic bearing and the rotor, the ventilation hole, and the outlet end of the first cooling channel are sequentially connected to form the the first cooling channel; A stator mounting seat is installed on the outer side of the stator; One end of the stator mounting seat is fixedly connected with the magnetic bearing seat of the second radial magnetic bearing, and an air flow channel is arranged between the stator mounting seat and the inner wall of the casing of the motor, and the air flow channel is along the line. The axial extension of the rotor, and the outlet end of the air flow channel is communicated with the first cooling channel, and the airflow of the air flow channel passes through the rotor and the second radial magnetic bearing, which is the cooling of the rotor and the second radial magnetic bearing; The inlet end of the air flow channel is opened on the casing of the motor, and the air inlet hole 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 ventilation hole, and the air flow in the air flow channel passes through the second radial magnetic bearing from the ventilation hole, and communicates with the first cooling channel, which is the second radial magnetic bearing. bearing cooling; The air inlet holes and the air holes are arranged in the same direction and not coaxially; A hole diameter of the air intake hole is larger than a hole diameter of the ventilation hole. 2. The magnetic levitation motor with negative pressure air cooling device as claimed in claim 1, wherein the magnetic levitation motor with 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 set on the magnetic bearing seat of the second radial magnetic bearing, and the second cooling channel has an inlet end. The airflow enters from the inlet end of the second cooling channel, passes through the axial magnetic bearing, and flows out from the outlet end of the second cooling channel to cool the axial magnetic bearing. 3 . The magnetic levitation motor with a negative pressure air cooling device according to claim 2 , wherein, along the radial direction of the rotor, the axial magnetic bearing end cover and the axial magnetic bearing rotor disk are separated. 4 . There is a first gap therebetween, 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. 4. The magnetic levitation motor with a negative pressure air cooling device according to claim 1, wherein the magnetic levitation motor with a negative pressure air cooling device further comprises an impeller cover; the exhaust end is arranged on the impeller cover superior.

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