WO2016145984A1

WO2016145984A1 - Electric motor

Info

Publication number: WO2016145984A1
Application number: PCT/CN2016/074787
Authority: WO
Inventors: 徐洋; 坎尼宁佩卡; 王轶群; 梅景浩
Original assignee: Abb技术有限公司; 徐洋; 坎尼宁佩卡; 王轶群; 梅景浩
Priority date: 2015-03-17
Filing date: 2016-02-29
Publication date: 2016-09-22

Abstract

Disclosed is an electric motor, comprising a machine base (1) and a cooler (2) arranged on the machine base (1), wherein the machine base (1) is internally provided with a rotor (3) and a stator (4), an axial rotor vent hole (33) and a radial rotor vent hole in communication with the axial rotor vent hole (33) are arranged in the rotor (3) in the axial direction thereof, and the stator (4) is provided with a radial stator vent hole; a cooler air inlet (21) is in communication with the radial stator vent hole, and a cooler air outlet (22) is in communication with the axial rotor vent hole (33);and the radial rotor vent hole comprises at least one rotor end part vent hole (321) and at least one rotor main body part vent hole (311), the radial stator vent hole comprises at least one stator end part vent hole (421) and at least one stator main body part vent hole (411), the rotor end part vent hole (321) is aligned to the stator end part vent hole (421), and the rotor main body part vent hole (311) and the stator main body part vent hole (411) are arranged in a staggered manner.

Description

Motor

Technical field

The present invention relates to the field of electric equipment, and in particular to an electric machine.

Background technique

The motor dissipates heat during operation and requires cooling of its internal structure. The motor of the prior art, as shown in Fig. 1, has an internal air path structure, and the rotor 2' is a boosting device. The cooling air flows from the cooler into the axial venting hole of the rotor, is ventilated by the rotor radial venting opening 21' of the rotor 2' and the stator radial venting opening 11' of the stator 1', and finally enters the cooler to constitute a motor air path circulation.

Due to the high speed operation of the two-pole motor, the radial vents of the stator and rotor are usually staggered to avoid noise problems. The flow rate in the axial venting hole of the rotor gradually increases from the inlet position of the vent hole, causing uneven flow distribution in the radial venting hole 21' of the rotor, so that the air volume of the stator radial venting holes 11' at the end is the least and the straight end The temperature rise is not conducive to cooling.

In addition, the small air outlet area of the base will cause the overall pressure loss of the motor, which will reduce the total air volume.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to overcome the deficiencies in the prior art and to provide a motor which has a good cooling effect and can reduce the temperature of the stator end.

An electric motor provided by the technical solution of the present invention comprises a base and a cooler disposed on the base, wherein a rotor and a stator are disposed in the base, and a rotor axial vent is disposed in the rotor along the axial direction thereof a rotor radial venting hole communicating with the axial venting hole of the rotor, wherein the stator is provided with a stator radial venting hole; a cooler inlet of the cooler and the stator radial direction The vent holes are in communication, and the cooler air outlet of the cooler is in communication with the rotor axial vent; wherein the rotor radial vent includes At least one rotor end vent disposed on an air inlet end of the rotor and at least one rotor body vent disposed on a body portion of the rotor, the stator radial vent comprising the At least one stator end vent on an end of the stator and at least one stator body vent disposed on a body portion of the stator, and the rotor end vent is aligned with the stator end vent The rotor main body vent hole is alternately arranged with the stator main body vent hole.

Further, the rotor radial vent includes three of the rotor end vents, and correspondingly, the stator radial vent includes three of the stator end vents.

Further, the rotor radial vent includes a plurality of the rotor body vents, and the stator radial vent includes a plurality of the stator body vents; wherein any two adjacent stators A rotor body portion venting hole is disposed between the main body vent holes.

Further, each of the rotor body portion vent holes is located at an intermediate position of two adjacent stator body portion vent holes.

Further, the rotor includes two air inlet ends, and the two air inlet ends are respectively disposed at two ends of the rotor body portion, and each of the air inlet ends is provided with at least one a rotor end vent hole; correspondingly, at least one of the stator end vent holes is respectively disposed at two ends of the stator, and the rotor end vent holes on each side are aligned with the stator end vent holes The cooler air outlets of the cooler are respectively connected to the two air inlet ends, and a partition plate is disposed in the rotor axial air vent.

Further, the partition is located intermediate the axial vent of the rotor.

Further, at least one of the cooler air outlets is respectively disposed at two ends of the cooler, and the cooler air outlets at both ends are respectively communicated with the two air inlet ends.

Further, two mounting frames are disposed on the top surface of the base, and the cooler is mounted on the two supporting frames; the top surface is provided with a frame air outlet and a frame air inlet. The air outlet of the rack is located between the two support racks; the air inlet of the cooler is in communication with the air outlet of the rack, and the air outlet of the cooler is in communication with the air inlet of the rack.

Further, the stator includes a stator core; the length of the air outlet of the rack The degree is greater than or equal to the length of the stator core, and the width of the frame air outlet is greater than or equal to the diameter of the stator.

Further, the center height of the motor is greater than 355 mm.

The above technical solution has the following beneficial effects:

By aligning the rotor end vents with the stator end vents, the air volume in the stator end vents is increased, and the stator end temperature is lowered, which is beneficial to the motor cooling.

By expanding the area of the air outlet of the frame to a length greater than or equal to the length of the stator core, the width is greater than or equal to the diameter of the stator, and the overall ventilation of the motor is increased to reduce the temperature rise of the motor.

Therefore, the motor provided by the invention has a good cooling effect, can reduce the temperature of the stator end portion, and is beneficial to the overall cooling of the motor.

DRAWINGS

1 is a schematic view showing the cooperation of a stator radial vent hole and a rotor radial vent hole in a motor in the prior art;

2 is a schematic view showing the internal structure of a motor provided by the present invention;

3 is a schematic view showing the cooperation of the radial ventilating holes of the stator and the radial venting holes of the rotor in the motor shown in FIG. 2;

Figure 4 is a schematic view showing the alignment of the rotor end vent and the stator end vent;

5 is a schematic view showing a staggered arrangement of a vent hole of a rotor main body portion and a vent hole of a stator main body portion;

Figure 6 is a schematic view of the top surface of the base.

Reference mark comparison table:

1'-stator; 11'-stator radial venting; 2'-rotor;

21'-rotor radial venting hole;

1-frame; 11-top; 111-support frame;

112-rack air outlet; 113-frame air inlet; 2-cooler;

21-cooler air inlet; 22-cooler air outlet; 3-rotor;

31- body portion; 311-rotor body portion venting hole; 32-wind inlet end;

321-rotor end vent; 33-rotor axial vent; 34-separator;

4-stator; 41- body portion; 411-stator body vent;

42-end; 421- stator end vent; 5-rotor shaft.

detailed description

Specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. The same components are denoted by the same reference numerals. It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, the words "inside" and "outside" "Respectively refers to the direction toward or away from the geometric center of a particular component.

As shown in FIG. 2-5, an electric machine according to an embodiment of the present invention includes a base 1 and a cooler 2 disposed on the base 1. The rotor 3 and the stator 4 are disposed in the base 1.

A rotor axial venting hole 33 is disposed in the rotor 3 along the axial direction thereof. The rotor 3 is provided with a rotor radial venting hole communicating with the rotor axial venting hole 33, and the stator 4 is provided with a stator radial venting hole.

The cooler air inlet 21 of the cooler 2 is in communication with the stator radial vent, and the cooler air outlet 22 of the cooler 2 is in communication with the rotor axial vent 33.

Wherein the rotor radial vent includes at least one rotor end vent 321 disposed on the air inlet end 32 of the rotor 3 and at least one rotor body vent 311 disposed on the body portion 31 of the rotor 3, the stator diameter The vent hole includes at least one stator end vent hole 421 provided on the end portion 42 of the stator 4 and at least one stator body portion vent hole 411 provided on the main body portion 41 of the stator 4, and the rotor end vent hole 321 is The stator end vent holes 421 are aligned, and the rotor main body vent holes 311 are alternately arranged with the stator main body portion vent holes 411.

That is, the motor is mainly composed of a base 1, a cooler 2, a rotor 3, and a stator 4, and the rotor 3 and the stator 4 are disposed in the base 1. The rotor 3 is mounted on the base 1 via a rotor shaft 5 which surrounds the outer circumference of the rotor 3. Both the rotor 3 and the stator 4 are cylindrical or It is cylindrical and both are arranged with the central axis.

The vent holes arranged along the axial direction of the rotor 3 are referred to as rotor axial vent holes, and the vent holes arranged along the radial direction of the rotor 3 and the stator 4 are referred to as rotor radial vent holes and stator directional vent holes, respectively.

For the purpose of ventilation cooling, a rotor axial vent 33 is provided on the rotor 3 along its axial direction, and a rotor radial vent is provided on the rotor 3, which communicates with the rotor axial vent 33 for the rotor The wind in the axial vent 33 is introduced into the radial vent of the rotor. A stator radial vent is provided on the stator 4. The wind in the radial vents of the rotor is finally led out through the stator radial vents.

The cooler air inlet 21 of the cooler 2 is in communication with the stator radial vents, and the cooler air outlet 22 of the cooler 2 is in communication with the rotor axial vent 33 to form at least one cooling circuit.

The wind entering the machine base 1 passes through the rotor axial vent 33, the rotor radial vent, and the stator radial vent, and then enters the cooler 2 for cooling, and then the cooled wind is introduced into the cooler by the cooler 2. In the seat 1, it is recycled in turn, and the stator and the rotor are cooled and cooled.

In order to better achieve the cooling effect, avoid the temperature rise of the end of the stator 4, and increase the ventilation of the stator end, the rotor radial vent and the stator radial vent are set as follows:

The rotor radial vent includes at least one rotor end vent 321 and at least one rotor body vent 311. The rotor end vent 321 is provided on the air inlet end portion 32 of the rotor 3, and the rotor body portion vent hole 311 is provided on the main body portion 31 of the rotor 3. The air inlet end portion 32 is an end portion of the rotor 3 adjacent to the cooler air outlet 22 for introducing the wind of the cooler air outlet 22 into the rotor axial air vent 33.

The stator radial vent includes at least one stator end vent 421 and at least one stator body vent 411. The stator end vent hole 421 is provided on the end portion 42 of the stator 4, and is provided corresponding to the rotor end vent hole 321; the stator main body portion vent hole 411 is provided on the main body portion 41 of the stator 4, corresponding to the rotor main body portion vent hole 311 Settings.

Further, the rotor end vent 321 is disposed in alignment with the stator end vent 421, and the rotor main body vent 311 is interleaved with the stator main body vent 411. That is, the rotor end vent 321 is aligned with the stator end vent 421 in the same straight line; the rotor body vent 311 and the stator body vent 411 are staggered or misaligned, on different straight lines.

In this way, by aligning the stator end vent 421 with the rotor end vent 321 , the amount of ventilation between the two is increased, the temperature of the end of the stator 4 is effectively reduced, and the temperature difference at the end is reduced. value. Aligning the stator end vent 421 with the rotor end vent 321 also produces a higher concentration force.

By arranging the rotor main body vent hole 311 and the stator main body portion vent hole 411 in parallel, the air flow rate between the two is effectively reduced, and noise is reduced.

Preferably, as shown in Figures 3-4, the rotor radial vent includes three rotor end vents 321 and, correspondingly, the stator radial vent includes three stator end vents 421. Three stator ends The venting holes 421 are respectively arranged in alignment with the three rotor end vent holes 321 to further increase the flow ventilation of the stator end portion and reduce the temperature of the end portion or the straight end portion thereof.

Preferably, as shown in FIGS. 3 and 5, the rotor radial vent includes a plurality of rotor body vents 311, and the stator radial vents include a plurality of stator body vents 411.

A rotor body portion venting hole 311 is disposed between any two adjacent stator body portion vent holes 411.

That is, in the axial direction, each rotor main body portion vent hole 311 is interposed between the adjacent two stator main body portion vent holes 411 such that the rotor main body portion vent hole 311 is interdigitated with the stator main body portion vent hole 411 The arrangement reduces the amount of flow ventilation between the main body portion 31 of the rotor 3 and the main body portion 41 of the stator 4, and reduces noise.

Preferably, the rotor body portion ventilation 311 and the stator body portion venting hole 411 The number ratio is n:n+1 to ensure that each rotor body portion vent hole 311 is interposed between the adjacent two stator body portion vent holes 411, so that the wind in the rotor body portion vent hole 311 can pass through the stator body. The venting holes 411 are led out, which ensures the cooling effect and reduces the noise.

Preferably, as shown in FIGS. 3-5, each rotor body portion vent 311 is located at an intermediate position between two adjacent stator body portion vents 411 such that two adjacent stator body portions are in the venting holes 411. The ventilation is equal, so that the temperature is consistent.

Preferably, as shown in FIGS. 2-3, the rotor 3 includes two air inlet ends 32, and two air inlet ends 32 are respectively disposed at both ends of the rotor main body portion 31, and each air inlet end portion 32 is disposed. There is at least one rotor end vent 321 .

Correspondingly, at least one stator end venting hole 421 is respectively disposed at two ends of the stator 4, and the rotor end venting holes 321 of each side are aligned with the stator end venting holes 421;

The cooler air outlets 22 of the cooler 2 are in communication with the two air inlet ends 32, respectively, and a partition 34 is provided in the rotor axial vents 33.

In this way, two cooling circuits are formed between the cooler 2 and the rotor 3 and the stator 4, and both ends of the rotor 3 are introduced with air, and the wind entering the rotor axial vent 33 is blocked by the partition 34 to enter the rotor. In the axial venting hole, two closed cooling loops are formed to improve the cooling effect.

Preferably, the partition 34 is located intermediate the axial vent 33 of the rotor to ensure that the temperatures at both ends of the stator 4 are the same, avoiding temperature differences between the ends.

Preferably, as shown in FIG. 2, at least one cooler air outlet 22 is respectively disposed at two ends of the cooler 2, and the cooler air outlets 22 at both ends are respectively communicated with the two air inlet ends 32 to be in the cooler 2 The inner sides of each of them form a cooling circuit, which is favorable for cooling, and facilitates the arrangement of the cooler 2.

Preferably, as shown in FIG. 6, the top surface 11 of the base 1 is provided with two support frames 111, and the cooler 1 is mounted on the two support frames 111.

The top surface 11 is provided with a frame air outlet 112 and a frame air inlet 113. The frame air outlet 112 is located between the two support frames 111; the cooler air inlet 21 and the frame are out. The tuyere 112 is in communication, and the cooler air outlet 22 is in communication with the frame air inlet 113.

Each of the top surfaces 11 may be provided with one rack air inlet 113 as needed, or two rack air inlets 113 may be provided, and a plurality of rack air inlets 113 may be provided as needed, which are all within the protection scope of the present invention. .

The area of the frame air outlet 112 can cover the radial venting hole of the stator as a whole, so that the wind coming out from the radial vent hole of the stator can smoothly enter the cooler 2 for sufficient cooling, and then enter the frame through the cooler air outlet 22 and the frame. The tuyere 113 enters the axial axial vent 33 of the rotor for circulating cooling, so that the overall pressure loss of the motor is reduced, the air flow is improved, and the temperature rise of the motor is effectively reduced.

Preferably, the stator 4 includes a stator core (not shown); the length of the frame air outlet 112 is greater than or equal to the length of the stator core, and the width of the frame air outlet 112 is greater than or equal to the diameter of the stator 4.

The stator radial venting hole is disposed on the stator core, and the frame air outlet 112 is set to have a length ≥ the length of the stator core, and the width thereof is ≥ the diameter of the stator 4 to increase the area of the frame air outlet 112, thereby improving Ventilation and the ability to expose all stator radial vents, effectively reducing motor temperature rise.

Preferably, the electric machine comprises an electric motor and a generator having a center height greater than 355 mm. The center height refers to the height from the base plane of the base to the center of the shaft. The motor with a center height higher than 355mm is a medium and large motor. The motor is preferably a high speed large two-pole asynchronous motor.

In summary, the motor provided by the invention has a good cooling effect, can reduce the temperature of the stator end portion, and is beneficial to the overall cooling of the motor.

According to the needs, the above technical solutions can be combined to achieve the best technical effect.

The foregoing is merely illustrative of the principles and preferred embodiments of the invention. It should be noted that a number of other variations can be made by those skilled in the art based on the principles of the present invention and should be considered as the scope of the present invention.

Claims

An electric machine comprising a base (1) and a cooler (2) disposed on the base (1), wherein the base (1) is provided with a rotor (3) and a stator (4),

The rotor (3) is provided with a rotor axial venting hole (33) along its axial direction, and the rotor (3) is provided with a rotor diameter communicating with the rotor axial venting hole (33). To the venting hole, the stator (4) is provided with a stator radial venting hole;

The cooler air inlet (21) of the cooler (2) communicates with the stator radial vent, the cooler air outlet (22) of the cooler (2) and the rotor axial vent (33) Connected

Wherein the rotor radial vent includes at least one rotor end vent (321) disposed on the air inlet end (32) of the rotor (3) and a body portion disposed on the rotor (3) At least one rotor body vent (311) on (31), the stator radial vent comprising at least one stator end vent (421) disposed on an end (42) of the stator (4) And at least one stator body portion vent hole (411) provided on the main body portion (41) of the stator (4), and the rotor end vent hole (321) and the stator end vent hole (421) In alignment, the rotor body portion venting holes (311) are alternately arranged with the stator body portion venting holes (411).
The motor according to claim 1, wherein said rotor radial vent includes three said rotor end vents (321), and wherein said stator radial vents comprise three of said stators End vents (421).
The motor according to claim 1 or 2, wherein said rotor radial vent includes a plurality of said rotor main body vents (311), said stator radial vents including a plurality of said stator bodies Ventilation hole (411);

One of the rotor body portion vent holes (311) is disposed between any two adjacent stator body portion vent holes (411).
The motor according to claim 3, characterized in that each of said rotor main body vent holes (311) is located at an intermediate position of two adjacent said stator main body portion vent holes (411).
The electric machine according to claim 1 or 2, characterized in that the rotor (3) Two air inlet ends (32) are included, and the two air inlet ends (32) are respectively disposed at two ends of the rotor body portion (31), and each of the air inlet ends (32) Provided with at least one of the rotor end vents (321);

Correspondingly, at least one of the stator end vent holes (421) is respectively disposed at two ends of the stator (4), and the rotor end vent hole (321) and the stator end portion of each side are ventilated Hole (421) alignment setting;

The cooler air outlets (22) of the cooler (2) are respectively communicated with the two air inlet ends (32), and a partition plate is disposed in the rotor axial air vent (33) ( 34).
The electric machine according to claim 5, characterized in that the partition (34) is located intermediate the axial vent (33) of the rotor.
The motor according to claim 5, characterized in that at least one of the cooler air outlets (22) is respectively disposed at two ends of the cooler (2), and the cooler air outlets (22) at both ends respectively It is in communication with two of the inlet ends (32).
The electric machine according to claim 1, characterized in that the top surface (11) of the base (1) is provided with two support frames (111), and the cooler (1) is mounted on two of the above Support frame (111);

The top surface (11) is provided with a frame air outlet (112) and a frame air inlet (113), and the frame air outlet (112) is located between the two support frames (111);

The cooler air inlet (21) communicates with the rack air outlet (112), and the cooler air outlet (22) communicates with the rack air inlet (113).
The electric machine according to claim 8, wherein said stator (4) comprises a stator core;

The length of the frame air outlet (112) is greater than or equal to the length of the stator core, and the width of the frame air outlet (112) is greater than or equal to the diameter of the stator (4).
The electric machine according to claim 1 or 2 or 8 or 9, wherein the motor has a center height greater than 355 mm.