CN117394578A - Motor with fan - Google Patents

Motor with fan Download PDF

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Publication number
CN117394578A
CN117394578A CN202210846121.2A CN202210846121A CN117394578A CN 117394578 A CN117394578 A CN 117394578A CN 202210846121 A CN202210846121 A CN 202210846121A CN 117394578 A CN117394578 A CN 117394578A
Authority
CN
China
Prior art keywords
bearing flange
bearing
flange
fan
rotor shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210846121.2A
Other languages
Chinese (zh)
Inventor
李金长
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sew Motor Suzhou Co ltd
Original Assignee
Sew Motor Suzhou Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sew Motor Suzhou Co ltd filed Critical Sew Motor Suzhou Co ltd
Priority to CN202210846121.2A priority Critical patent/CN117394578A/en
Priority to DE102023002494.5A priority patent/DE102023002494A1/en
Priority to PCT/EP2023/025288 priority patent/WO2024008328A1/en
Publication of CN117394578A publication Critical patent/CN117394578A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/163—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at only one end of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225—Terminal boxes or connection arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium

Abstract

The invention relates to an electric machine with a fan, which has a stator housing, to which a bearing flange of the electric machine is connected, to which bearing flange the fan is connected, in which bearing flange a bearing, in particular an outer ring of the bearing, is received for rotatably supporting a rotor shaft of the electric machine, the bearing flange having a first recess which runs radially through with respect to the axis of rotation of the rotor shaft, through which recess an air flow fed by the fan flows into an inner space region radially surrounded by the bearing flange, the bearing flange having a second recess which is spaced apart from the first recess in the circumferential direction, through which the inner space region communicates with the environment outside the bearing flange, and/or through which the air flow is discharged from the inner space region into the environment outside the bearing flange.

Description

Motor with fan
Technical Field
The invention relates to a motor with a fan.
Background
It is known that an electric motor generates lost heat which is expelled into the environment.
Disclosure of Invention
The object of the invention is therefore to improve the motor as compactly as possible.
According to the invention, this object is achieved by an electric machine according to the features given in claim 1.
In connection with an electric machine with a fan, an important feature of the invention is that the electric machine has a stator housing, to which a bearing flange of the electric machine is connected,
wherein the fan is connected to a bearing flange in which a bearing, in particular an outer ring of the bearing, is received for rotatably supporting a rotor shaft of the electric machine,
wherein the bearing flange has a first recess which runs radially with respect to the rotational axis of the rotor shaft and through which the air flow fed by the fan flows into an inner space region radially surrounded by the bearing flange,
wherein the bearing flange has a second recess spaced apart from the first recess in the circumferential direction, through which the inner space region communicates with the outer environment of the bearing flange, and/or through which the air flow is discharged from the inner space region into the outer environment of the bearing flange.
The advantage here is that the motor can be constructed compactly, i.e. with a small installation space, without power reduction. The additional cooling of the bearing flange by the fan removes the heat loss of the first bearing of the rotor shaft and of the optionally additionally present shaft seal ring. Accordingly, a respective fan may be provided at each bearing position of the motor. It is also important that the air flow of the first fan cools the inner wall of the bearing flange and that the air flow of the second fan cools the outer wall of the bearing flange.
In an advantageous embodiment, the fan housing of the fan has a flange projecting from the fan housing, which flange rests against a flat connection surface of the bearing flange. The advantage here is that a stable fixing of the fan can be achieved.
In an advantageous embodiment, a bearing cap for receiving a further bearing of the rotor shaft is arranged on the side of the stator housing facing away from the bearing flange,
wherein on the side of the stator housing facing away from the bearing flange, the second fan wheel is connected in a rotationally fixed manner to the rotor shaft and is radially surrounded by a fan housing, which is connected in a releasable manner to the bearing cover,
wherein the air flow fed by the second fan wheel flows along the cooling ribs formed on the outside of the stator housing in the axial direction, in particular, that is to say parallel to the axis of rotation of the rotor shaft, and in particular thereafter along the bearing flange,
in particular, the fan housing has a grille opening extending through the fan housing on its axial end facing away from the bearing flange, in particular for the inflow of an air flow,
in particular, wherein the cooling fins are spaced apart from each other in the circumferential direction,
in particular, the axial direction, the radial direction and/or the circumferential direction are based on the rotational axis of the rotor shaft. The advantage here is that the air flow cools the stator housing on the one hand and the bearing flange which is thereby cooled on both sides on the other hand.
In an advantageous embodiment, the terminal box is arranged on the stator housing and is connected to the stator housing. The advantage here is that the fan requires only a little more installation space than the junction box, since the fan can utilize the radial extent covered by the junction box in the circumferential corner region covered by the junction box.
In an advantageous embodiment, the peripheral corner region covered by the terminal box in the circumferential direction encloses the peripheral corner region covered by the fan. The advantage here is that only a slightly more installation space is required for the fan.
In an advantageous embodiment, the terminal box is spaced apart from the fan in the axial direction. The advantage here is that the bearing flange can be cooled separately.
In an advantageous embodiment, the radial extent covered by the fan, in particular by the fan housing, comprises the radial extent covered by the junction box. The advantage here is that the fan only needs to have a slightly larger radial extension.
In an advantageous embodiment, the flange part is connected to the bearing flange in a detachable manner in the region of the inner space radially surrounded by the bearing flange,
wherein the rotor shaft protrudes through the recess of the flange part,
in which a shaft seal ring is received in the flange part, which shaft seal ring seals against the rotor shaft, in particular the sealing lip of which shaft seal ring thus works on the rotor shaft,
in particular, the flange part is arranged on the side of the bearing flange axially facing away from the stator housing and/or on a bearing receptacle/bearing seat of the bearing, which is formed in the bearing flange. The advantage here is that the motor has fans on both sides and thus a more efficient cooling can be produced. Here, the fans do not interfere with each other. Because the air flow of the first fan flows substantially transversely to the rotor shaft rotational axis, the air flow of the second fan flows parallel to the rotor shaft rotational axis, i.e. in the axial direction.
In an advantageous embodiment, the bearing flange is formed as a square flange on its side facing the stator housing and as a circular flange on its side facing away from the stator housing, in particular for connection to a device to be driven, in particular a reduction gear. The advantage here is that the bearing flange is designed as an interface and can therefore be arranged between differently shaped flange types.
In an advantageous embodiment, the bearing flange has a cylindrical outer surface in the region covered by the connecting surface in the axial direction, which outer surface is interrupted in the region of the circumferential angle covered by the connecting surface in the circumferential direction, in particular for forming the connecting surface. The advantage here is that a simple production can be achieved.
In an advantageous embodiment, on the bearing flange, one or more cooling ribs protrude in the axial direction into the inner space region radially enclosed by the bearing flange, in particular, the flange part connected to the bearing flange, which receives the shaft seal ring sealed against the rotor shaft, is radially enclosed by the one or more cooling ribs of the bearing flange. The advantage here is that improved cooling can be achieved and the air flow can be diverted in the axial direction.
In an alternative advantageous embodiment, one or more cooling ribs protrude on the bearing flange in the radial direction, i.e. in particular radially inward, into the inner space region radially enclosed by the bearing flange. The advantage here is that improved cooling can be achieved and the air flow is also guided in an improved manner.
In an advantageous embodiment, the bearing flange is made of aluminum. In this case, the advantage is that improved cooling can be achieved.
In an advantageous embodiment, axially oriented cooling ribs parallel to the cooling ribs formed on the stator housing protrude on the outside of the bearing flange. The advantage here is that the air flow guide of the axially oriented cooling fins is embodied in an elongated manner, whereby the outer side of the bearing flange is flown through by the axially oriented air flow and the inner side is flown through by the air flow oriented in the circumferential direction. The two air streams are thus oriented in a crossed manner and/or transversely to each other.
Further advantages are given by the dependent claims. The invention is not limited to the combination of features of the claims. Other reasonable combinations of the claims and/or individual claim features and/or the description features and/or the drawing features are available to the person skilled in the art, in particular from the objects proposed and/or by comparison with the prior art.
Drawings
The invention will now be described in detail with reference to the drawings.
Fig. 1 shows a motor according to the invention in an oblique view.
Fig. 2 shows the motor in a semi-sectional side view.
Fig. 3 shows a bearing flange 6 of the electric motor in an oblique view, wherein the fan 3 is connected to the bearing flange 6.
The bearing flange 6 is shown in an oblique view in fig. 4.
The fan 3 is shown in an oblique view in fig. 5.
List of reference numerals:
1. fan cover
2. Junction box
3. Blower, in particular radial blower
4. Rotor shaft
5. Radial through notch
6. Bearing flange
7. Heat sink
8. Flange
20. Bearing
40. Connection surface
41. Radial through notch
Detailed Description
As shown, the motor has a stator housing on which axially extending cooling ribs 7 running parallel to one another are formed.
A first bearing flange 6 is fastened to a first axial end region of the stator housing, in which a bearing 20 for rotatably supporting the rotor shaft 4 of the electric machine is received.
The fan 3 is placed onto the bearing flange 6 and connected thereto. For this purpose, a protruding collar region 8 is formed on the housing of the fan 3, which collar region rests against the connection surface 40 and is preferably fastened by means of screws which pass through the collar region and are screwed into threaded bores arranged in the planar connection surface and whose screw heads press the collar region 8 against the connection surface.
On the side of the stator housing facing away from the bearing flange 6, a bearing cap for receiving a further bearing of the rotor shaft 4 is arranged. Furthermore, the second fan wheel is connected to the rotor shaft 4 in a rotationally fixed manner and is surrounded by the fan housing 1. The air flow fed by the second fan wheel is discharged between the stator housing and the fan housing 1 in such a way that the air flow is directed against the cooling fins 7 and thus flows along them.
The fan 3 is preferably designed as a radial fan, in particular wherein the air flow fed by the fan 3 flows out of the fan 3 essentially tangentially to the radially outer circumferential portion of the fan blades of the air flow fed by the fan and passes through a recess 41 which runs radially through the rotor shaft 4 of the electric motor relative to the rotational axis into the interior region of the bearing flange 20.
The air flow is led from the inner space region of the bearing flange to the environment via the second radial through recess of the bearing flange 6.
The air flow thus enters the bearing flange 3 in a radial direction with respect to the rotational axis of the rotor shaft 4 and likewise enters the bearing flange via the second recess 5.
The second notch 5 is preferably diametrically opposed to the first notch 41. In particular, the angular position comprised by the circumferential angular region covered in the circumferential direction by the second notch 5 differs by 180 ° from the angular position comprised by the first notch 41.
The fan housing of the fan 3 has a flange 8 which rests on a flat connection surface of the bearing flange 6 and is fastened by means of screws.
A junction box 2 is arranged on the stator housing, into which junction box the power supply line is led through a cable nipple. The cables for supplying the fan 3 are likewise introduced into the interior space region of the junction box via a cable nipple.
The area covered by the junction box 2 in the circumferential direction includes a circumferential angular area covered by the fan 3, based on the rotation axis of the rotor shaft 4.
Furthermore, the region covered by the fan 3 in the axial direction overlaps not only the region covered by the bearing flange 6 in the axial direction but also the region covered by the stator housing in the axial direction. Thus, the fan does not require additional axial structural length.
The bearing flange 6 is connected to the stator housing at a first axial end region thereof and is connected or connectable to the gear housing at the other axial end region thereof.
The bearing flange is preferably formed with a square flange on its end face facing the stator housing and is connected with its side facing axially away from the stator housing to a circular flange, in particular to the gear housing or to the gear housing.
The rotor shaft 4 protrudes through the bearing flange 6. A clear interior region exists radially between the rotor shaft 4 and the bearing flange, into which the air flow fed by the fan 3 flows via the recess 41. The air flow from the interior space region into the environment flows out through the recess 5 into the environment.
However, since the air flow is also conveyed by the second fan wheel along the cooling ribs 7 in the axial direction toward the bearing flange 6, wherein the air flow impinges on the bearing flange 6 behind the cooling ribs 7, the bearing flange 6 radiates heat by the air flow both on its outer side and on its inner side.
It is also important that one of the two air streams remains active at all times in the event of failure of the fan 3 or of the air stream delivered by the second fan wheel. The cooling of the bearing flange 6 is thus reliably carried out, in particular, in terms of a higher safety level.
The normal of the flat connection surface 40 is perpendicular to the axis of rotation of the rotor shaft 4. The circumferential angle area covered by the connected surface 40 in the circumferential direction with reference to the rotation axis of the rotor shaft 4 overlaps with the circumferential angle area covered by the junction box 2 in the circumferential direction.
In particular, the installation space occupied by the terminal box is therefore sufficient for the fan 3 to be included in the case of an axial extension of this installation space, except in the radial direction. Because in the radial direction the fan 3 protrudes from the junction box 2.
The connecting surface 40, which is configured flat, is formed in each case as a hollow rectangle, and the cylindrical outer circumference of the bearing flange 6 is interrupted in the circumferential corner region covered by the connecting surface.
After connecting the gear housing to the bearing flange 6 on the side of the bearing flange facing away from the stator housing, the inner space region radially enclosed by the bearing flange 6 is delimited axially on the one hand by the gear and on the side facing away from the gear by the bearing received in the bearing flange 6 and the associated sealing device. The sealing device has a shaft seal ring which is received in a flange part, wherein the flange part is connected to the bearing flange and is arranged in the interior region.
The axis of rotation of the rotor shaft 4 is preferably perpendicular to the axis of rotation of the fan 3, but preferably parallel to the flat connection surface 40.
The recess 5 is arranged diametrically opposite the recess 41 on the circumference of the bearing flange 6, so that the recess 41 is arranged vertically above the recess 5 when the bearing flange is oriented vertically, i.e. when the bearing flange 6 is oriented in this vertical space. In this way, rain water can be prevented from penetrating into the interior space region and the penetrating water can be discharged into the environment via the recess 5.
In other embodiments according to the invention, a further device, in particular a machine, is connected to the bearing flange instead of the reduction gear. For example, the wheel, in particular the sprocket wheel, is fitted onto the rotor shaft 4 and is connected in a rotationally fixed manner, in particular by means of a key connection.
The inner space region radially surrounding the bearing flange 6 communicates directly with the oil-filled reducer inner space in which the intermeshing toothed parts of the reducer are arranged. The input pinion is connected in a rotationally fixed manner to the rotor shaft 4, in particular by means of a keyed connection, and meshes with the toothed part of the reduction gear.

Claims (13)

1. An electric machine with a fan is provided,
the motor has a stator housing, with which a bearing flange of the motor is connected,
it is characterized in that the method comprises the steps of,
the fan is connected to the bearing flange, in which a bearing, in particular an outer ring of the bearing, is received for rotatably supporting a rotor shaft of the electric machine,
the bearing flange has a first recess which runs radially with respect to the axis of rotation of the rotor shaft and through which the air flow fed by the fan flows into an inner space region radially surrounded by the bearing flange,
the bearing flange has a second recess, which is spaced apart from the first recess in the circumferential direction and through which the inner space region communicates with the outer environment of the bearing flange, and/or through which the air flow is discharged from the inner space region into the outer environment of the bearing flange.
2. An electric machine according to claim 1,
it is characterized in that the method comprises the steps of,
the fan housing of the fan has a flange projecting on the fan housing, which rests against a flat connection surface of the bearing flange.
3. An electrical machine according to any preceding claim,
it is characterized in that the method comprises the steps of,
a bearing cap for receiving a further bearing of the rotor shaft is arranged on the side of the stator housing facing away from the bearing flange,
on the side of the stator housing facing away from the bearing flange, the second fan wheel is connected in a rotationally fixed manner to the rotor shaft and is radially surrounded by a fan housing which is connected in a releasable manner to the bearing cap,
the air flow fed by the second fan wheel flows along the cooling ribs formed on the outside of the stator housing in the axial direction, in particular, that is to say parallel to the axis of rotation of the rotor shaft, and in particular thereafter along the bearing flange,
in particular, the fan housing has a grille opening extending through the fan housing on its axial end facing away from the bearing flange, in particular for the inflow of an air flow,
in particular, the fins are spaced apart from each other in the circumferential direction,
in particular, the axial direction, the radial direction and/or the circumferential direction are referenced to the rotational axis of the rotor shaft.
4. An electrical machine according to any preceding claim,
it is characterized in that the method comprises the steps of,
a junction box is disposed on the stator housing, the junction box being connected to the stator housing.
5. An electrical machine according to any preceding claim,
it is characterized in that the method comprises the steps of,
the circumferential corner region covered by the junction box in the circumferential direction includes a circumferential corner region covered by the blower.
6. An electrical machine according to any preceding claim,
it is characterized in that the method comprises the steps of,
the junction box is spaced apart from the fan in the axial direction.
7. An electrical machine according to any preceding claim,
it is characterized in that the method comprises the steps of,
the radial extent covered by the fan, in particular by the fan housing, includes the radial extent covered by the junction box.
8. An electrical machine according to any preceding claim,
it is characterized in that the method comprises the steps of,
in the region of the inner space radially surrounded by the bearing flange, the flange part is connected to the bearing flange in a detachable manner,
the rotor shaft protrudes through the gap of the flange part,
in the flange part, a shaft seal ring is received, which seals against the rotor shaft, in particular the sealing lip of the shaft seal ring thus working on the rotor shaft,
in particular, the flange part is arranged on the side of the bearing flange axially facing away from the stator housing and/or on a bearing receptacle of the bearing, which is formed in the bearing flange.
9. An electrical machine according to any preceding claim,
it is characterized in that the method comprises the steps of,
the bearing flange is shaped as a square flange on its side facing the stator housing and as a circular flange on its side facing away from the stator housing, in particular for connection to a device to be driven, in particular a gear reducer.
10. An electrical machine according to any preceding claim,
it is characterized in that the method comprises the steps of,
in the region of the connection surface covered in the axial direction, the bearing flange has a cylindrical outer surface which is interrupted in the region of the circumferential angle of the connection surface covered in the circumferential direction, in particular for forming the connection surface.
11. An electrical machine according to any preceding claim,
it is characterized in that the method comprises the steps of,
on the bearing flange, one or more cooling ribs project in the axial direction into the region of the inner space radially surrounded by the bearing flange, in particular the flange part connected to the bearing flange, which part receives the shaft seal ring sealed toward the rotor shaft, is radially surrounded by the one or more cooling ribs of the bearing flange,
or,
on the bearing flange, one or more cooling ribs project in the radial direction, i.e. in particular radially inwards, into the inner space region radially surrounded by the bearing flange.
12. An electrical machine according to any preceding claim,
it is characterized in that the method comprises the steps of,
the bearing flange is made of aluminum.
13. An electrical machine according to any preceding claim,
it is characterized in that the method comprises the steps of,
on the outside of the bearing flange axially oriented cooling ribs project parallel to cooling ribs formed on the stator housing.
CN202210846121.2A 2022-07-04 2022-07-04 Motor with fan Pending CN117394578A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202210846121.2A CN117394578A (en) 2022-07-04 2022-07-04 Motor with fan
DE102023002494.5A DE102023002494A1 (en) 2022-07-04 2023-06-20 Electric motor with fan
PCT/EP2023/025288 WO2024008328A1 (en) 2022-07-04 2023-06-20 Electric motor having a fan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210846121.2A CN117394578A (en) 2022-07-04 2022-07-04 Motor with fan

Publications (1)

Publication Number Publication Date
CN117394578A true CN117394578A (en) 2024-01-12

Family

ID=89467271

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210846121.2A Pending CN117394578A (en) 2022-07-04 2022-07-04 Motor with fan

Country Status (1)

Country Link
CN (1) CN117394578A (en)

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