A housing to provide an air cooling to a permanent-magnet motor, a method of cooling a permanent-magnet motor and a blower

Abstract

A housing for providing air cooling for a permanent magnet motor of a blower is disclosed. According to one embodiment, a housing for providing air cooling for a permanent magnet motor used to drive an impeller (210) of a blower (100) to be provided is disclosed. The housing includes a cylindrical cavity (211) for accommodating the permanent magnet motor, and further includes: two openings (213, 214) located at a first end and a second end of the cavity (211) for radially guiding airflow toward the motor when it is accommodated; a first set of cooling channels between and connected to the openings (213, 214) for guiding airflow tangentially around the motor; and a second set of cooling channels connected to the first set of cooling channels for radially guiding airflow from the outside of the housing to the first set of cooling channels. The housing also includes a deflection channel (105) located on the outside of the housing for guiding airflow between the corresponding first opening (213) and second opening (214) on one side and the second set of cooling channels on the other side.

Description

Technical Field

[0001] This invention relates to the technical field of centrifugal compressors (also known as turbo compressors, blowers, or simply fans). More specifically, the invention relates to a housing for housing a permanent magnet motor for driving a blower impeller, so as to provide gas cooling for the motor.

[0002] The present invention also relates to a method for cooling a permanent magnet motor used to drive a blower impeller using a gas (such as air) with the housing. Prior Technology

[0003] A blower (or simply a fan) is a machine that exchanges energy between a fluid flow and a system of blades that perform rotational motion. In the case of a blower, the blade system is also called an impeller.

[0004] The impeller provides the flow and is driven, for example, by a motor such as a permanent magnet motor. The permanent magnet motor directly drives the impeller.

[0005] During operation, the engine will generate heat. For safety, efficiency, and machine lifespan reasons, this heat must be dissipated by providing a cooling system.

[0006] US10533560B2 discloses a direct-drive turbine fan that includes a perforated housing for air cooling of the engine stator. However, a drawback of this approach is that it cannot guarantee that the engine rotor will also be effectively cooled.

[0007] Therefore, one object of the present invention is to provide a fan housing for housing a permanent magnet motor, wherein the motor can be cooled more effectively without impairing normal operation. Another object of the present invention is to provide a method for cooling a motor using the disclosed housing. Summary of the Invention

[0008] According to the present invention, the above-mentioned objective is achieved by means of the following: According to a first aspect of the present invention, a housing according to claim 1 is provided, the housing being configured to provide air cooling to a permanent magnet motor, the permanent magnet motor being configured to drive an impeller of a blower, the housing comprising a cylindrical chamber being configured to house the permanent magnet motor, and further comprising a housing comprising: - A first set of openings and a second set of openings, located at a first end and a second end of the chamber, respectively, are configured to guide airflow radially from the outside of the housing toward the rotor of the permanent magnet motor when housed. - A first set of cooling channels on the rotor, the first set of cooling channels being located between and connected to a first set of openings and a second set of openings, the first set of cooling channels being configured to guide airflow axially around the permanent magnet motor when housed; - A second set of cooling channels connected to the first set of cooling channels, the second set of cooling channels being configured to guide airflow radially from the outside of the housing to the first set of cooling channels; The housing also includes a deflection channel located outside the housing, which is configured to guide airflow between an opening in a first set of openings or a second set of openings on one side and a second set of cooling channels on the other side.

[0009] Certain terms or definitions are used to describe this invention. Here, "direction" is understood to mean that one can move along that (imaginary) line, while "pointing" is understood to mean that one can move to the side of the line indicated by that direction. Movement, for example, is the movement of airflow.

[0010] The housing is designed to house a permanent magnet motor, which is then configured to drive a blower impeller. This further implies that the housing is designed for a blower.

[0011] The housing includes a cylindrical chamber or a chamber therein capable of housing a permanent magnet motor. It should be further understood that this may also include space for bearings to support the rotor of the motor. Additionally, space exists for the stator. Around this chamber, there is a shell that completely surrounds the chamber. This shell includes two opposing openings at both ends of the chamber. In other words, there are two sets of openings at each end. The term "opposite" is a geometric term meaning that the openings are opposite openings, preferably 180° apart. Each set of these opposing openings is configured to guide airflow radially from the outside to the rotor of the motor. In other words, this means that airflow can be blown perpendicular to the axial direction of the rotor, and this occurs at both ends. It should be further understood that, as will be explained further, one opening in each set will be used to guide airflow from the outside of the shell to the rotor, while the corresponding opposing opening will be used to guide airflow from the rotor back to the outside.

[0012] Furthermore, as discussed above, the housing includes a first set of cooling channels located between the two sets of openings, wherein these cooling channels are connected to the openings at the rotor. These cooling channels travel around the chamber, so that when the engine is housed in the chamber, these cooling channels travel around the engine in the axial and tangential directions. Additionally, a second set of cooling channels exists, connected to the cooling channels in the first set, and configured to guide airflow radially from the outside of the housing to the cooling channels in the first set.

[0013] Furthermore, according to the novel innovative features, the housing includes a deflection channel located outside the housing, which is configured to guide airflow between an opening in either the first or second set of openings on one side and a second set of cooling channels on the other side. Depending on the direction and orientation of the airflow, as will be explained further, the airflow can then be guided from either the first or second set of openings to the cooling channels in the second set of cooling channels, and vice versa. As described below, the airflow can then follow a path along and around the permanent magnet motor and along the air gap between the rotor and stator.

[0014] In the first possibility, airflow is blown through the first opening in the first set of openings. This causes the airflow to be blown radially toward the rotor, and the airflow further flows through the opposite opening in the first set of openings. At the second opening, the airflow then flows radially away from the motor to the outside of the housing. By providing a deflection channel, the airflow is then forced to flow further through the cooling channels in the second set of cooling channels, which then connect with the cooling channels in the first set of cooling channels. This forms an airflow around and along the permanent magnet motor. In the second possibility, air is initially blown through the opening in the second set of openings, but the airflow follows the same path, such that, in this second possibility, the air also circulates around the motor.

[0015] According to one embodiment, the housing further includes an airflow barrier configured to impede the flow of air at a predetermined pressure. For example, the predetermined pressure is greater than 100 millibars; however, it should be noted that this specified value should not be construed as limiting, and other values ​​are also possible. There are two possibilities for the placement of the airflow barrier.

[0016] According to the first embodiment, the airflow blocking part is placed on the outside of the housing at the opening in the first group of openings or the second group of openings, thereby forcing the airflow to flow into the air gap between the rotor and stator of the permanent magnet motor when it is housed, the air gap extending axially between the first group of openings and the second group of openings.

[0017] According to the second embodiment, the airflow blocking part is placed on the outside of the housing between the first set of openings and the second set of openings, so that the airflow is blocked at the second set of external cooling channels, and the airflow is guided tangentially around the motor and toward the air gap between the rotor and stator of the permanent magnet motor when it is housed, the air gap extending axially again between the first set of openings and the second set of openings.

[0018] According to these two embodiments, airflow is forced through the air gap between the stator and rotor of the permanent magnet motor, which provides effective cooling around and around the rotor. In other words, the airflow will flow axially between the stator and rotor.

[0019] Using the housing according to these embodiments, the permanent magnet motor can be cooled in different ways. Different configurations can be employed to cool the motor by utilizing two sets of openings, cooling channels, deflection channels, and airflow obstructions. According to a second aspect of the invention, a method for cooling a permanent magnet motor using the housing according to the first aspect of the invention is also disclosed.

[0020] In the process of driving the impeller of a blower via a permanent magnet motor, the rotor of the machine will have a higher temperature than the stationary parts of the blower. However, using the housings and methods known in the prior art, this rotor cannot be directly cooled. Therefore, as will be discussed further, the advantage of the present invention is that the permanent magnet motor can be cooled directly and thus efficiently.

[0021] A first method for cooling a permanent magnet motor configured to drive a blower impeller using a housing according to a first aspect of the invention comprises the following steps: - Provide a first airflow at the first opening of the first set of openings; - The first airflow is redirected at the opening opposite the first opening by utilizing and according to the redirection channel; - A second airflow is provided at the first opening in the second set of openings; - Utilize and block the second airflow according to the airflow blocking part; In this configuration, the opening in the second set of openings is located on the side away from the impeller when it is assembled, and the power providing the second airflow is greater than the power providing the first airflow.

[0022] To achieve this method, the airflow blocking part is placed outside the housing at the opening in the second set of openings, thereby forcing the airflow to flow into the air gap between the rotor and stator of the permanent magnet motor when it is housed.

[0023] A first airflow is provided by a first fan, and a second airflow is provided by a second fan. The first airflow is blown into the opening in the first set of openings by the fan. The airflow is then diverted through a deflector to a cooling channel group, which guides the airflow radially from the outside of the housing to the inside. As the airflow is guided to the inside, it flows back to the first set of cooling channels, allowing it to flow tangentially and axially, i.e., around the rotor of the permanent magnet motor. Furthermore, the first airflow from the first fan exits the housing along the second set of cooling channels on the side opposite to where the deflector is located. Simultaneously, a second airflow is provided by the second fan at the opening in the second set of openings. The second airflow then flows to this opening, where an airflow obstruction forces it to flow axially along the rotor of the permanent magnet motor through the air gap between the stator and rotor to the opening in the first set of openings. The second airflow then connects with the first airflow and then continues to flow along the aforementioned path.

[0024] It should be further understood that the cooling channel group between the first set of openings and the second set of openings on both sides of the housing may include openings from which ducts pass to and around the engine.

[0025] Furthermore, when the second set of openings is located on the side furthest from the impeller during assembly, the power providing the second airflow is greater than the power providing the first airflow. In other words, when the housing includes a permanent magnet motor, and the housing and impeller are further assembled to form a blower, the second fan is more powerful than the first fan. For example, for illustration, the second fan has 800 watts of power, while the first fan has 600 watts. However, it should be noted that other values ​​are possible and can depend on the power of the permanent magnet motor, and therefore also on the power of the blower.

[0026] The aforementioned airflow can be provided in different ways. The direction of the first airflow is parallel to the direction of the second airflow, or even better, they are in the same direction.

[0027] A second method for cooling a permanent magnet motor configured to drive a blower impeller using a housing according to a second aspect of the invention comprises the following steps: - Provide the first airflow at the second set of cooling channels; - Use the deflection channel to direct the first airflow into the opening in the first set of openings; - A second airflow is provided at the opening in the second set of openings; - Use and block the second airflow according to the airflow blocking part; and In this configuration, the opening in the second set of openings is located on the side away from the impeller when it is assembled, and the power providing the second airflow is greater than the power providing the first airflow.

[0028] To apply this method, the airflow obstruction is placed just as in the previous method, so that the opening in the second set of openings is placed on the outside of the housing, so that the airflow is guided toward the air gap between the rotor and stator of the permanent magnet motor when it is housed.

[0029] Similarly, according to this method, the first airflow is provided by a first fan, and the second airflow is provided by a second fan. In this case, the first fan is placed between the two sets of openings and directed towards the second set of cooling channels. Therefore, air is then radially blown into the housing through the cooling channels in the second set of cooling channels, and then guided tangentially and axially around the rotor via the cooling channels in the first set of cooling channels. Simultaneously, the second airflow is provided at the openings in the second set of openings, and the second airflow is blocked by means of and according to the airflow obstruction. This means that the second airflow is forced to flow axially through the air gap between the rotor and stator, and this flows from the openings in the second set of openings to the openings in the first set of openings. When assembled in the housing, the second set of openings is positioned away from the impeller, and therefore the first set of openings is positioned adjacent to the impeller. Furthermore, the power supplied to the second airflow is greater than the power supplied to the first airflow. This forces the airflow to reach the first set of openings through the deflection channel and the air obstruction, where the air, having absorbed heat, then exits the housing.

[0030] Preferably, in this method, the first and second airflows are parallel in direction but point in opposite directions.

[0031] A third method for cooling a permanent magnet motor configured to drive a blower impeller using a housing according to a first aspect of the invention includes the following steps: - Provide the first airflow to the second set of cooling channels; - Use the deflection channel to redirect the first airflow to the opening in the second set of openings; - The first airflow that has been redirected is blocked at the opening opposite to the second set of openings using an airflow blocking section; - A second airflow is provided at the opening in the first set of openings; and The second set of openings is located on the side away from the impeller when it is assembled, and the power to provide the first airflow is greater than the power to provide the second airflow.

[0032] Similarly, the first airflow is provided by the first fan, and the second airflow is provided by the second fan. Here, the first fan is positioned between two sets of openings and directed towards the cooling channels in the second set of cooling channels. In this method, the first airflow is diverted to an opening in the second set of openings via a deflection channel located on the opposite side of the housing from the side where the first airflow is blown between the openings in the cooling channels. Note that the deflection channel is located in the middle of the two sets of openings, between the second set of openings. In this second set of openings, in addition to the deflection channel, an airflow obstruction is also located on the opposite side. Therefore, the deflected air is obstructed and forced to flow into the air gap between the rotor and stator, flowing towards the first set of openings. Then, the second airflow is provided through the second fan at the opening in the first set of openings. This second airflow then flows transversely to the axial direction of the rotor when housed, and then provides partial suction of the airflow from the first fan.

[0033] Preferably, in the method just discussed, the direction of the second airflow is parallel to and opposite to the direction of the first airflow.

[0034] A fourth method for cooling a permanent magnet motor configured to drive a blower impeller using a housing according to a first aspect of the invention includes the following steps: - A first airflow is provided at the opening in the first set of openings; - A second airflow is provided at the opening in the second set of openings; - Use and redirect the second airflow according to the redirection channel; - Use and block the redirected second airflow according to the airflow blocking part; The second set of openings is located on the side away from the impeller when it is assembled, and the power of providing the second airflow is greater than the power of providing the first airflow.

[0035] As with the previous method, the first airflow is provided by the first fan. This blows air into the openings in the first set of openings. Simultaneously, the second fan blows air into the openings in the second set of openings. The second airflow then redirects from the opposite openings into the cooling channels in the second set of cooling channels. An airflow deflector is located on the opposite side of the housing along which the second airflow is redirected. This then forces the redirected airflow axially toward the first set of openings into the air gap between the rotor and stator of the permanent magnet motor when it is housed. Furthermore, the first airflow creates a suction effect, causing the airflow to circulate around the rotor to cool it. Additionally, the second set of openings is located on the side away from the impeller when assembled, and the power supplied by the second airflow is greater than the power supplied by the first airflow.

[0036] Preferably, in the method just discussed, the direction of the second airflow is parallel to and opposite to the direction of the first airflow.

[0037] It should be noted that the airflow blocking part used in the above method restricts the air to a predetermined value, which can be greater than 100 millibars, but can also be other values.

[0038] According to a final embodiment, a method for cooling a permanent magnet motor configured to drive a blower impeller using a housing according to a first aspect of the invention is disclosed, the method comprising the following steps: - A first airflow is provided at the opening in the first set of openings; - A second airflow is provided at the opening in the second set of openings; - Provide a third airflow at the second set of cooling channels; - Utilize and block the second airflow according to the airflow blocking part; The second set of openings is located on the side away from the impeller when it is assembled, and the power of the second airflow provided is greater than the power of the first airflow provided.

[0039] According to a supplier, a blower is disclosed, comprising a permanent magnet motor and a housing according to a first aspect of the invention, wherein the permanent magnet motor is configured to drive an impeller of a blower mounted in the housing.

[0040] According to one embodiment, the blower further includes a first fan located at a first opening and a second fan located at a second opening, the fans being configured to perform one of the methods of the second aspect of the invention.

[0041] According to one embodiment, the blower further includes an exhaust passage for discharging airflow, the exhaust passage being located at an opening at a different position than the diversion passage. Simple Explanation of the Diagram

[0042] The invention will be further described with reference to the accompanying drawings, wherein... Figure 1 illustrates a fan according to an embodiment of the present invention; Figure 2 schematically illustrates a fan comprising a cylindrical cavity for housing a permanent magnet motor and indicates the airflow path to illustrate a first method of cooling the permanent magnet motor housed within the cylindrical cavity; Figure 3 schematically illustrates a fan comprising a cylindrical chamber for housing a permanent magnet motor and indicates the airflow path to illustrate a second method of cooling the permanent magnet motor housed within the cylindrical chamber; Figure 4 schematically illustrates a fan comprising a cylindrical chamber for housing a permanent magnet motor and indicates the airflow path to illustrate a third method of cooling the permanent magnet motor housed within the cylindrical chamber; Figure 5 schematically illustrates a fan comprising a cylindrical chamber for housing a permanent magnet motor and indicates the airflow path to illustrate a fourth method of cooling the permanent magnet motor housed within the cylindrical chamber; Figure 6 schematically illustrates a fan comprising a cylindrical chamber for housing a permanent magnet motor and indicates an airflow path to illustrate a fifth method of cooling the permanent magnet motor housed within the cylindrical chamber. Implementation

[0043] The invention will be described with reference to certain embodiments and accompanying drawings, but is not limited thereto; rather, it is defined only by the scope of the claims. The described drawings are illustrative only and not restrictive. In the drawings, the dimensions of some elements may be exaggerated and not drawn to scale for illustrative purposes. Dimensions and relative sizes do not necessarily correspond to actual embodiments of the invention.

[0044] Furthermore, the terms "first," "second," "third," etc., are used in the specification and claims to distinguish similar elements, but not necessarily for the purpose of describing order or chronological sequence. Where appropriate, these terms can be used interchangeably, and embodiments of the invention may be implemented in an order different from that described or illustrated herein.

[0045] Furthermore, the terms "upper," "lower," "above," and "below" used in the specification and claims are for illustrative purposes and are not necessarily for describing relative positions. Such terms may be used interchangeably where appropriate, and embodiments of the invention described herein may be implemented in directions other than those described or illustrated herein.

[0046] Furthermore, while the various embodiments are referred to as "preferred embodiments," they should be understood as examples of how the invention can be implemented, rather than as limitations on the scope of the invention.

[0047] The term "comprising" as used in the claim should not be construed as limited to the means or steps listed thereafter; the term should not exclude other elements or steps. The term should be understood to indicate the presence of the listed features, elements, steps, or components, but should not exclude the presence or addition of one or more other features, elements, steps, or components, or groups thereof. Therefore, the scope of the expression "apparatus comprising means A and B" should not be limited to an apparatus consisting solely of components A and B. It means that, for the purposes of this invention, only components A and B of the apparatus are listed, and the claim should be further understood to include equivalents of these components.

[0048] Furthermore, the invention is described with reference to a fan and / or airflow. Since airflow is provided by a fan, these references are interchangeable. In other words, a reference to a fan can also refer to airflow, and vice versa.

[0049] Figure 1 illustrates a fan according to an embodiment of the present invention. The fan 100 includes a housing configured to house a permanent magnet motor. The fan 100 is a machine that exchanges energy between a fluid flow and a blade system (in this example, an impeller) that performs rotational motion. The impeller is located inside the fan 100 and ensures that compressed air is available at the outlet 101 of the fan 100. For this purpose, a motor is used to drive the impeller; according to the illustrated embodiment, the motor is a permanent magnet motor. During its operation, i.e., when the permanent magnet motor drives the impeller, the motor will generate heat. To ensure proper operation, this motor must be cooled. For this purpose, two fans 103 and 104 are used, which, in conjunction with the housing and the methods to be discussed further, cool the rotor and stator of the motor. In addition, there is an exhaust port 102 for discharging the air that has absorbed heat. Finally, Figure 1 shows a deflection channel 105, which, in conjunction with openings, cooling channels, air gaps, and airflow obstructions, ensures effective cooling. This will be discussed further below with reference to Figures 2 through 6.

[0050] Figures 2 through 6 illustrate a method for cooling a permanent magnet motor housed within a fan 100 during operation. Referring to Figure 2, a cylindrical chamber 211 is shown for housing the permanent magnet motor. A rotor is located within this chamber, and a stator 212 is located around the rotor. Reference numeral 210 indicates the location of an impeller driven by the permanent magnet motor. Furthermore, reference numeral 213 indicates a location referred to as the first set of openings, and reference numeral 214 indicates a location referred to as the second set of openings. It should be noted that the first set of openings 213 is located on the side closer to the impeller, while the second set of openings 214 is positioned away from the impeller. Additionally, solid and dashed arrows are used in the illustrations of Figures 2 through 6. Solid arrows indicate a first airflow, as discussed further, while dashed arrows indicate a second airflow. This is true for each figure in Figures 2 through 6.

[0051] Referring again to Figure 2, there is a first fan 201 providing a first airflow (thus indicated by a solid arrow) and a second fan 202 providing a second airflow (thus indicated by a dashed arrow). The first airflow is blown through the opening in the first set of openings 213, guided to the outer casing of the housing via the deflection channel indicated by reference numeral 203, along the cooling channel in the second set of cooling channels, around the motor, and then flows out of the housing again (indicated by reference numeral 206). Furthermore, the second fan 202 provides a second airflow to the opening in the second set of openings 214. Opposite to the fan 202, there is an airflow obstruction section indicated by reference numeral 204. Reference numeral 205 indicates that a portion of the airflow is allowed to pass through, but most of the airflow is blocked. This obstruction forces the second airflow to flow through the air gap between the rotor and stator, indicated by reference numeral 207. The airflow then continues to the opening in the first set of openings 213 and merges with the first airflow. Note further that in this method, the power of the second fan 202 is greater than the power of the first fan 201. For example, the second fan 202 has a power of 800W, and the first fan 201 has a power of 600W. The power mentioned here as an example can also be used in the methods shown in Figures 3 to 6.

[0052] Figure 3 illustrates a second method for cooling a permanent magnet motor. According to this method, a first fan 301 is located on the outer casing of the housing to blow a first airflow through cooling channels in a second set of cooling channels. These channels then travel radially inward, surrounding the motor via the cooling channels in the first set, and then return through the housing to the outside opposite the first fan 301. The first airflow is then redirected to a first set of openings via a deflector channel 303. Furthermore, a second fan 302 with greater power than the first fan 301 blows a second airflow into the openings in the second set of openings. An airflow deflector 304 is located opposite this, partially blocking the blown airflow, causing most of the airflow to travel axially and tangentially along the air gap 306, then communicate with the first airflow, and exit the housing via 305.

[0053] In the method shown in Figure 4, a first airflow is blown into the opening of the first set of openings by a first fan 401, and a second airflow is blown into the opening of the second set of openings by a second fan 402. Here, the power supply for the second airflow is greater than the power supply for the first airflow. The second airflow then turns from the opening of the second set of openings 404 to the outer housing, more specifically, the second set of cooling channels. Furthermore, an airflow blocking part 403 is provided on the outer housing, further forcing the second airflow to flow into the air gap 406 between the rotor and stator, where it then merges with the first airflow. The first and second airflows then exit the housing at reference numeral 405.

[0054] Figure 5 illustrates a final method for cooling a permanent magnet motor using the housing. Fan 501 blows a first airflow into an opening in the first set of openings, and fan 502 blows a second airflow through an air passage in the second set of air channels to the outer housing at a higher power than the first airflow. The second airflow passes through the housing and is redirected 505 to an opening in the second set of openings, where an airflow deflector 503 is further positioned to force the airflow towards an air gap 506 to merge with the first airflow, and exits the housing at position 504.

[0055] Finally, there is another method, as shown in Figure 6, in which three fans 601-603 are used to cool the engine. In this method, airflow is blown by fan 601 into the opening in the first set of openings. Airflow is blown by fan 602 into the second set of cooling channels. Finally, a third airflow is blown by fan 603 into the opening in the second set of openings. Depending on the direction of the fans, and therefore the direction and orientation of the various airflows, there may be deflecting channels to redirect one of the airflows. Furthermore, there is an airflow blocking section 604 at the opening in the second set of openings, thereby forcing the airflow 605 to flow axially and tangentially along the rotor. Finally, the airflow (which is partly a combination of various airflows) exits the housing via 606 and 607.

[0056] 100: Fan 101: Export 102: Exhaust port 103: Fan 104: Fan 105: Turning Channel 201: First Fan 202: Second Fan 203: Turning Channel 204: Airflow obstruction section 205: Airflow 206: Outer shell 207: Air gap 210: Impeller 211: Chamber 212: Stator 213: First group of openings 214: Second set of openings 301: First Fan 302: Second Fan 303: Turning Channel 304: Airflow obstruction section 305: Exit from the outer shell 306: Air gap 401: First Fan 402: Second Fan 403: Airflow obstruction section 404: Opening Turn 405: Exit from the outer shell 406: Air gap 501: Fan 502: Fan 503: Airflow obstruction section 504: Exit from the outer casing 505: Turning 506: Air gap 601: Fan 602: Fan 603: Fan 604: Airflow obstruction section 605: Airflow 606: Exit from the shell 607: Exit from the casing

Claims

1. A housing configured to provide air cooling to a permanent magnet motor, the permanent magnet motor including a stator and a rotor, the permanent magnet motor being configured to drive an impeller of a blower to provide air cooling, the housing including a cylindrical chamber configured to house the permanent magnet motor, and further including a casing comprising: - A first set of openings and a second set of openings, respectively located at a first end and a second end of the chamber, configured to guide airflow radially from the outside of the housing toward the rotor of the permanent magnet motor when housed; - A first set of cooling channels on the rotor, located between and connected to the first and second sets of openings, configured to guide airflow axially around the permanent magnet motor when housed; - A second set of cooling channels connected to the first set of cooling channels, configured to guide airflow radially from the outside of the housing to the first set of cooling channels; wherein the housing further includes a deflection channel located on the outside of the housing, the deflection channel being configured to guide airflow between an opening in one of the first or second sets of openings and the second set of cooling channels on the other side; The housing also includes an airflow blocking portion configured to block the flow of airflow at a predetermined pressure. The airflow blocking portion is disposed outside the housing at an opening in either the first or second set of openings, such that air is forced into the air gap between the rotor and stator of the permanent magnet motor when it is housed, the air gap extending axially between the first and second set of openings.

2. A housing configured to provide air cooling to a permanent magnet motor, the permanent magnet motor including a stator and a rotor, the permanent magnet motor being configured to drive an impeller of a blower to provide air cooling, the housing including a cylindrical chamber configured to house the permanent magnet motor, and further including a casing comprising: - A first set of openings and a second set of openings, respectively located at a first end and a second end of the chamber, configured to guide airflow radially from the outside of the housing toward the rotor of the permanent magnet motor when housed; - A first set of cooling channels on the rotor, located between and connected to the first and second sets of openings, configured to guide airflow axially around the permanent magnet motor when housed; - A second set of cooling channels connected to the first set of cooling channels, configured to guide airflow radially from the outside of the housing to the first set of cooling channels; wherein the housing further includes a deflection channel located on the outside of the housing, the deflection channel being configured to guide airflow between an opening in one of the first or second sets of openings and the second set of cooling channels on the other side; The housing also includes an airflow blocking section configured to block the flow of airflow at a predetermined pressure. The airflow blocking section is disposed on the exterior of the housing between the first set of openings and the second set of openings, such that airflow to the second set of external cooling channels is blocked, and the airflow is guided tangentially around the permanent magnet motor and directed to the air gap between the rotor and stator of the permanent magnet motor when it is housed, the air gap extending axially between the first set of openings and the second set of openings.

3. The housing as claimed in any one of claims 1 or 2, wherein the predetermined pressure at which the airflow is blocked by the airflow obstruction is greater than 100 mbar.

4. A method for cooling a permanent magnet motor using the housing described in claim 1, the permanent magnet motor being configured to drive the impeller of a blower, the method comprising the steps of: - Provide a first airflow at the first opening in the first set of openings; - The first airflow is diverted at an opening opposite to the first opening using and according to a diversion channel; - A second airflow is provided at a first opening in the second set of openings; - The second airflow is blocked using and according to an airflow blocking portion; wherein the opening in the second set of openings is located on a side away from the impeller when assembled, and wherein the power of providing the second airflow is greater than the power of providing the first airflow.

5. A method for cooling a permanent magnet motor using the housing described in claim 1, the permanent magnet motor being configured to drive the impeller of a blower, the method comprising the steps of: - providing a first airflow at a second set of cooling channels; - Use the deflection channel to direct the first airflow to the opening in the first set of openings; - Provide a second airflow at the opening in the second set of openings; - Block the second airflow using and according to the airflow blocking part; and wherein the opening in the second set of openings is located on the side away from the impeller when assembled, and wherein the power of providing the second airflow is greater than the power of providing the first airflow.

6. A method for cooling a permanent magnet motor using the housing of claim 1, the permanent magnet motor being configured to drive the impeller of a blower, the method comprising the steps of: - providing a first airflow at a second set of cooling channels; - Use the deflection channel to redirect the first airflow to the opening in the second set of openings; - Using and according to the airflow blocking part, blocking the deflected first airflow at the opening opposite to the opening in the second set of openings; - Providing a second airflow at the opening in the first set of openings; and wherein the second set of openings is located on the side away from the impeller when assembled, and wherein the power of providing the first airflow is greater than the power of providing the second airflow.

7. A method for cooling a permanent magnet motor using the housing described in claim 2, the permanent magnet motor being configured to drive the impeller of a blower, the method comprising the steps of: - Provide a first airflow at the opening in the first set of openings; - A second airflow is provided at the opening in the second set of openings; - Use and according to the deflection channel to deflect the second airflow; - Use and according to the airflow blocking part to block the deflected second gas flow; wherein the second set of openings is located on the side away from the impeller when assembled, and wherein the power to provide the second airflow is greater than the power to provide the first airflow.

8. The method as described in any one of claims 4 to 7, wherein, The direction of the first airflow is the same as the direction of the second airflow.

9. The method as described in claim 8, wherein the direction of the first airflow is equal to the direction of the second airflow.

10. The method as described in claim 8, wherein the direction of the first airflow is opposite to the direction of the second airflow.

11. A method for cooling a permanent magnet motor using the housing described in claim 1, the permanent magnet motor being configured to drive the impeller of a blower, the method comprising the steps of: - Provide a first airflow at the opening in the first set of openings; - A second airflow is provided at the opening in the second set of openings; - A third airflow is provided at the second set of cooling channels; - The second airflow is blocked by and according to the airflow blocking part; wherein the second set of openings is located on the side away from the impeller when assembled, and wherein the power of providing the second airflow is greater than the power of providing the first airflow.

12. A blower comprising a permanent magnet motor and a housing as described in any one of claims 1 to 3, the permanent magnet motor being configured to drive an impeller of a blower housed within the permanent magnet motor.

13. The blower as claimed in claim 12 further includes a first fan located at an opening in a first set of openings and a second fan located at an opening in a second set of openings, the first fan and the second fan being configured to provide airflow in any one of the methods described in claims 4 to 9.

14. The blower of any one of claims 12 to 13 further includes an exhaust passage for discharging airflow, wherein the exhaust passage is located at an opening at a different location from the diversion passage.

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