DE102006016271A1 - Electric motor, has fixture elements provided as streamlined thickened parts of cooling fins - Google Patents

Abstract

An electric motor has cooling fins and fixture elements, the latter being designed as streamlined thickenings of the cooling fins, in which the fixture elements are arranged on the stator so that the footplate can be fixed in at least two, especially three, orientations on the stator , especially in at least two different directions of the footplate normals. An independent claim is also included for a cooling device for an electric motor.

Description

The The invention relates to an electric motor.

Engines with fans for self-ventilation and cooling fins on the stator housing are known.

From the EP 0 917 276 A1 is known a stator housing for electric motors, in which a terminal box 10 with one of its passage opening 20 in the ground 14 protruding neck 24 through a passage opening 42 in the stator housing 4 attacks. The passage opening extends transversely to the cooling ribs 40 over a range of multiple fins ( 6 and 17 ). To attach the terminal box are sleeve-shaped formations 46 provided, which are arranged in interruptions of the cooling fins and which engages in the extension of the cooling fins formed by the axially extending intermediate spaces. The through hole and the sleeve-like formations are provided on the top and on the sides of the stator housing, so that a terminal box 10 optionally can be attached to one or more of the three attachment points on the stator housing (Sp. 4, Z. 4-11).

Of the Invention is based on the object, an electric motor with improved cooling further education.

According to the invention Task in the electric motor according to the features specified in claim 1 solved.

Important features of the invention in the electric motor are that the latter comprises a stator with cooling fins and fastening elements,
wherein a foot plate is releasably connectable by means of the fastening elements with the stator,
wherein the fastening means are designed as streamlined thickening of cooling fins,
wherein the fastening elements are arranged on the stator such that the foot plate can be fastened in at least two, in particular three, orientations on the stator, in particular in at least two different directions of the normal of the foot plate.

in this connection gets under streamlined a profile shape of the cooling fins understood with thickening, with the profile shape through Cut the cooling fins with a coaxial mathematical-imaginary cylinder. there the tread shape is streamlined, leaving a smaller one flow resistance for the Cooling air flow is available.

From The advantage here is that formed by the cooling fins air ducts in which air, in particular from an engine fan, the stator housing flows along. Next is the foot plate variably orientable and attachable relative to the terminal box, by the foot plate can be mounted on one of the three sides. The terminal box is so Fixed on a fourth page. This advantageously avoids that three passage openings, So in each case a passage opening on each side, the air flow along the cooling fins obstruct and in particular steer radially away from the stator housing. The Streamlined shape of the fasteners advantageously causes the cooling air during normal operation of a motor fan, So at flow rates from 2 to 7 m / s, in the air ducts laminar, so with Reynolds number between 1200 and 4000 at one clear distance of the ribs with almond-shaped thickenings from each other from 6 to 15 mm, flows. The clear distance between the ribs with almond-shaped thickenings Represents this a characteristic length describing the geometry. The axial length the usable motors between 0.1 m and 1 m.

at Further advantageous embodiments are also flow rates from 1 to 10 m / s in the air ducts meaningful. Reynolds numbers between 1000 and 5000 are also advantageous. The distance of the ribs is also advantageous from 4 to 30 mm selectable at other flow rates are the structural dimensions of the stator housing with ribs to achieve a Reynolds number in the area like indicated above to choose accordingly. For larger flow rates is the characteristic length to choose smaller thus the product of both sizes constant stays, and vice versa.

Instead of Air is also generally a coolant, to Example water, predictable, that flows in the air ducts. In this case, in particular the flow velocity and the characteristic length to adjust so that the Reynolds number in the above range lies.

at In another advantageous embodiment, the cooling fins form Air ducts, in which air, in particular from an end face of the stator housing to others, in particular laminar, flows.

The laminar flow conditions surprisingly have a particularly advantageous effect that the air flow sweeps over the entire stator length and is not guided by turbulence out of the air ducts and thus away from the stator housing. Although the turbulence locally improves the cooling behavior, however, lead to parts of the stator housing are not swept by the air flow. Thus, by the occurrence of Turbu lenzen surprisingly reduced the cooling capacity.

at a further advantageous embodiment are connecting means, such as screws, rivets or clip means, for connecting the foot plate formed with the fastening means such that they are mounted in Location the streamlined shape of the cooling fins Don `t change. In particular, in the fastening means blind holes or Recesses provided in the imaginary plane by head and Foot of the cooling fins run and in which the connecting means are insertable.

From The advantage here is that by connecting the foot plate with the fasteners no additional, the air flow in the Air ducts in his current obstructing parts are introduced. This will cool the Motors improved.

at a further advantageous embodiment are in the cooling fins additional streamlined Fastening provided, in particular for the attachment of Type and / or Rating plates and / or electronic assemblies.

From The advantage is that additional Functions and / or electronic additional functions on the stator housing easy and safely attachable without the laminar flow in the air channels disturb.

at a further advantageous embodiment, the arrangement of Fasteners a two, four or many rotational symmetry on.

From The advantage here is that the foot plate and / or Nameplates and / or electronic assemblies on one side in various orientations can be mounted.

Important Features of the cooling device for a Electric motor according to claim 6, that three cooling ribs, in particular in the circumferential direction three consecutive, of which a first and a second for forming a first air duct and the second and third provided for forming a second adjacent air channel are, with the channels extend in the axial direction, and wherein the middle, that is second Cooling fin fastening means includes, with the side surfaces, ie the axially extending flank surfaces, the cooling fins to avoid or Reducing turbulence streamlined in the respective air duct are, in particular continuously differentiable.

From The advantage here is that an air flow between the cooling fins laminar feasible is. Particularly advantageous are the continuously differentiated training the cooling rib side surfaces avoid turbulence, the distraction of the air flow away from the stator and thus a reduction cause the cooling performance would. Another advantage is that on the stator a terminal box and / or housing for electronic Assemblies and / or foot plates are fastened, these in a fixed position for the air flow no additional flow resistance represent.

at In another advantageous embodiment, the air ducts are used as and B-side, so the faces the stator housing, connecting, linear, in particular parallel, channels formed, in particular from the cooling fins Be limited transversely to the axial direction. In particular, it is advantageous in the one of the three cooling fins formed air duct laminar air from the B side to the A side, or reversed, passable.

in this connection is understood by B side one side of the electric motor, on or at the a fan or a flow source for the coolant is arranged. Below A-side becomes one side of the electric motor understood, on which the coolant flows from the B side to. A and B side of an electric motor are preferably by the Location of bearing shields described with the opposite faces of the stator housing are connected.

From The advantage here is that the air flow for cooling the entire length of Stator passes over.

at In another advantageous embodiment, none are the flow resistance increasing Objects or obstacles provided in the air ducts, in particular after attachment of devices to the fasteners, wherein provided in particular on the fastening means blind holes are in the imaginary plane through the head and foot of the cooling fins run and in the connecting means for mounting are inserted.

From The advantage here is that at the fasteners devices can be attached without obstructing the air flow in the air ducts becomes.

Important Features of the invention in the cooling device for one Electric motor according to claim 10, that axially extending straight cooling fins and axially extending cooling fins with thickening are included, with the thickening of the cooling fins with thickening fasteners that cover the side surfaces of the straight cooling fins define at each point a tangent vector that is parallel lies to the motor axis, and the side surfaces of the cooling fins are designed streamlined, especially continuously differentiable.

The continuous differentiable formation of the lateral surfaces of the cooling fins, which are considered mathematical Ideally designed within technical tolerances causes advantageous that kinks, edges and / or steps in the side surfaces of the Cooling ribs avoided become. Such kinks, edges and / or steps are but as the cause of turbulence in the air flow known. The constantly differentiable training thus avoids advantageously the occurrence of such turbulence leads to laminar flow conditions between the cooling fins. Thus, it is advantageous to deflect the air flow away from the stator avoided.

at In a further advantageous embodiment, the cooling fins extend over the Length of the Stator housing.

at In another advantageous embodiment, the tangential vector forms to the profile shape of the cooling fins with thickening with the motor axle an angle of magnitude at most 40 °, preferably less than 30 °.

Thereby are advantageously avoided geometric shapes of the cooling fins, which the Promote formation of turbulence in the air flow.

at A further advantageous embodiment is each cooling fin with thickening of two straight fins adjacent.

From The advantage here is that the thickening is not from two adjacent ones cooling fins protrude into the common space and thus not the air flow distract and swirl.

at a further advantageous embodiment, the axial spatial Extension of fasteners more than twice the size of the Transverse extension of the fasteners.

From The advantage here is that the fastening means have a particularly streamlined shape and thus affect the air flow between the cooling fins as little as possible.

at a further advantageous embodiment exceeds the transverse extent the fastening means the clear distance to at least one adjacent Fin.

From The advantage here is that the fastening means a large attachment surface for devices to be fastened offer, in particular, thus a foot plate is stably attachable to the stator housing.

Important Feature of the invention in the electric motor with stator are that cooling fins and fasteners are included, with other components, in particular rating plate, foot plate or the like, by means the fasteners are detachably connectable to the stator, and wherein the fastening means are designed as thickenings of cooling ribs, being in the of the cooling fins no trained air ducts other obstacles, ie flow resistance magnifying objects and / or formations, are provided, in particular that the air flow in the air channels laminar flows in the axial direction and does not stand out from the cooling fins or from the space between the cooling fins.

From The advantage here is that only slight thickening in the cooling fins sufficient to accommodate the fasteners. Thus, in the cooling fins even screws can be screwed in and the heat is bolted to the additional component deliverable. Furthermore is the covered by the other component air duct between two adjacent cooling fins kept free by the thickening is made sufficiently small. In particular, thickenings are shaped such that the cooling air flow along the cooling fins is unhindered or only slightly hampered due to the thickening. The advantage here is that the cooling, so heat dissipation to the ambient air is improved and the performance of the engine is increased, in particular the maximum permissible power.

at In an advantageous embodiment, the thickenings run in Direction of the cooling fin about almond-shaped or streamlined and are spatially less extensive in the direction of the normal of the cooling fin than the distance to the nearest neighbor Fin. The advantage here is that the cooling air flow as possible laminar runs, so as little as possible Turbulences arise. Small turbulences, which are transverse to the flow direction As a small self-contained vortex, the fan is already introduced and act conducive for the Cooling. The thickenings are executable such that the cooling air flow in cooling fins direction is not stirred up and does not lift off, so not the crucial for the cooling Space between the cooling fins leaves. The almond-shaped shape course of the surface in the fin direction is continuously differentiable.

at In an advantageous embodiment, at least some of the fastening means in a plane. The advantage here is that just executed, more Components are screwed.

at In an advantageous embodiment, at least four of the fastening means in a plane. The advantage here is that a foot plate releasably connectable is and the motor stably attachable to such a mounting plate is.

at In an advantageous embodiment, the thickenings in the direction the normal of the cooling fin spatial less than half the distance to the nearest adjacent fin for reducing the influence on the cooling air flow. It is advantageous that the cooling air flow flows inside the ribs.

at In an advantageous embodiment, the thickenings include blind holes or centering aids, for example, as conical recesses are formed. The advantage here is that simple and inexpensive fasteners are predictable.

at an advantageous embodiment are at least four first of Fasteners in a first plane and at least four second the fastener in a second plane perpendicular to first level is arranged. The advantage here is that the engine can be mounted in different orientations.

at an advantageous embodiment, two fastening means for releasable connection with a rating plate and four other fasteners for the detachable connection with a foot plate, So mounting plate provided, especially in the area of the first Level. The advantage here is that the nameplate or the footplate optionally connectable.

Further Advantages emerge from the subclaims.

1

flange

2

cooling fin

3

almond-shaped thickening

4

fan cover

5

Junction box base

6

Connection box top

20

cam

30

Cable gland

31

stacking edge

40

Rectifier module as option

41

mounting screws for option

42

clipboard

43

Protective conductor connection device

80

well in cam

100

increase

101

deepening

The invention will now be explained in more detail with reference to figures:
In the 1 to 6 an inventive electric motor is shown in different views. The lower part of the associated terminal box is in the 7 and 8th shown in different views.

The motor is designed as an electric motor and has a flange 1 on, with which another device to be driven, such as transmission or mixer, can be connected.

At its stator housing, the engine has cooling fins 2 on, the partially almond-shaped thickenings 3 exhibit. The fan cover 4 is on the flange 1 provided opposite side. The terminal box, which can also be labeled as a terminal box, consists of a terminal box base 5 and one with this detachably connectable terminal box top 6 assembled as a lid. The connection box base 5 has cams on its outer side facing the stator housing of the engine 20 on, represent the accumulations of material for introducing a hole.

Since the parts of the engine, but in particular the housing-forming parts of the engine are designed to save as much material, the introduction of a bore in the housing is not easy and stable possible. Therefore, the cams offer 20 Material thickening, in which the holes 80 from the interior of the terminal box base are insertable. The shape of the cams is shark-fin-like. The cams are directed towards the engine at the junction box bottom. Without an oblique side, the strength would not be enough. The shark fin-like expression allows for slightly more material consumption than for the bore 80 necessary would be a high strength. Another surface that would be inclined would increase the material consumption further, but would not have a correspondingly large strength-increasing effect. The borehole 80 is designed as a pre-cast blind hole. It's just material around the hole 80 used around so that the minimum amount of material is consumed, with only a sloping side is provided to increase the strength with low material consumption.

The connection box base 5 includes cable glands in its housing wall 30 for passing cables. The protective conductor covered by these is connected to the protective conductor connection device 43 connected.

The rectifier module 40 is optional with the fixing screws 41 in the junction box base 5 attached.

The clipboard 42 at least serves to connect through the cable glands 30 guided supply lines with the winding wires of the stator.

The fan cover 4 has at its periphery in the circumferential direction alternating elevations 100 and depressions 101 on, so wavy indentations in the circumferential direction in the intake of the fan guard. In this way, noise emissions are reduced and in addition, the stiffness of the fan guard 4 elevated. The fan cover 4 additionally has a peripheral stacking edge 31 on. By means of this stack edge 31 are the hoods 4 Stackable in the warehouse to save space. The stack edge also has a stiffening effect on the fan cover 4 ,

The almond-shaped thickenings 3 are designed as a thickening of the cooling fins on the stator housing for the attachment of the nameplate, so rating plate, or for example on another side for the attachment of a base plate on which the engine is mounted. The almond-shaped thickenings 3 are arranged within a single level. In particular, four of these each belong together. The almond shape is designed such that they impede the flow of cooling air between two adjacent cooling fins as little as possible. For this they are about streamlined or almond-shaped running along the cooling fins. So the cooling fins are only slightly thickened in these areas. Advantageously, therefore, the engine is better cooled than in the prior art. Because there is no thickening that obstructs the flow of air between two cooling fins along the cooling fins. None of the thickenings even connects two adjacent cooling fins. Instead of introducing a blind hole, it is also advantageous to initially introduce only conical recesses as centering in the production. Only if then during the assembly of the engine really a hole should be provided, such is introduced. But then the drilling tool is simply centered and the location of the hole already pre-marked.

The wells are in further embodiments of the invention executed as blind holes.

Those Thickenings, which for the attachment of the foot plate are usable, have in further embodiments of the invention a conical Deepening in the area of the borehole as a centering aid in Screw in the fixing screws.

Instead of the rectifier module 40 In other embodiments of the invention, other electronic circuits, such as motor starters or soft starters or converters and control circuits, or connection devices, such as terminal strips or fixtures, such as mounting rails or the like, connectable.

Claims (22)

Electric motor with stator comprising cooling fins and fasteners, wherein a foot plate by means of the fastening elements with the stator is detachably connectable, characterized in that the fastening means are designed as streamlined thickening of cooling fins, wherein the fastening elements are arranged on the stator such that the base plate in At least two, in particular three, orientations on the stator can be fastened, in particular in at least two different directions of the normal of the base plate. Electric motor according to at least one of the preceding Claims, characterized in that the cooling fins form air channels, in which air in particular laminar, in particular from an end face of the Stators to the other, flows. Electric motor according to at least one of the preceding Claims, characterized in that the connecting means for connection the foot plate with the fasteners in the mounted position the streamlined shape the cooling fins do not change, in particular that in the fastening means blind bores are provided, the in the imaginary plane run through the head and foot of the cooling fins and into the the connecting means insertable are. Electric motor according to at least one of the preceding Claims, characterized in that in the cooling fins additional streamlined Fastening means are provided, in particular for attachment of type and / or rating plates and / or electronic assemblies. Electric motor according to at least one of the preceding Claims, characterized in that the arrangement of the fastening elements a two, four or many Has rotational symmetry. cooler for one Electric motor, comprising three cooling fins, in particular in the circumferential direction three consecutive, of which a first and a second for forming a first air duct and the second and third provided for forming a second adjacent air channel are, the channels in the axial direction, characterized in that the middle, so second, cooling fin Comprises fastening means, the side surfaces of the cooling fins to avoid or reduce turbulence in the respective air duct streamlined are trained especially continuously differentiable. cooler according to at least one of the preceding claims, characterized that the air ducts as A- and B-side, thus connecting the end faces of the stator housing, linear, in particular parallel, channels are formed, in particular from the cooling fins Be limited transversely to the axial direction. cooler according to at least one of the preceding claims, characterized that no the flow resistance increasing Objects or obstacles are provided in the air ducts, in particular after attachment of devices to the fastening means, in particular are provided on the fastening means blind holes, in the imaginary plane run through the head and foot of the cooling fins and into the Connecting means for fixing are insertable. cooler according to at least one of the preceding claims, characterized that in the of the three cooling fins formed air duct laminar air from the B side to the A side, or conversely, is passable. cooler for one Electric motor, full axially extending straight cooling fins, and axially extending cooling fins with thickening, characterized in that the thickenings the cooling fins include with thickening fastener, the lateral ones surfaces the straight cooling fins define at each point a tangent vector that is parallel to the motor axis, and the side surfaces of the cooling fins are streamlined, especially continuously differentiable. cooler according to at least one of the preceding claims, characterized that the cooling fins on the Length of the stator extend. cooler according to at least one of the preceding claims, characterized that the tangential vector to the profile of the cooling fins with thickening with the motor axis an angle of magnitude not more than 40 °, in particular at most 30 °, forms. cooler according to at least one of the preceding claims, characterized that every cooling fin with thickening of two straight fins adjacent. cooler according to at least one of the preceding claims, characterized that the axial spatial Extension of the fastener is more than twice as large as the Transverse extension of the fasteners. cooler according to at least one of the preceding claims, characterized that the transverse extent of the fastening means the clearance exceeds the size of at least one adjacent fin. Electric motor with stator, cooling fins and fixing elements includes, wherein further components, in particular rating plate, footplate or the like, by means of the fasteners with the stator solvable are connectable, characterized in that the fasteners as thickening of cooling fins accomplished are being in the of the cooling fins trained air ducts no further obstacles, thus increasing flow resistance Objects and / or formations, are provided, in particular that of Air flow in the air ducts laminar flows in the axial direction and does not stand out from the cooling fins or from the space between the cooling fins. Electric motor according to at least one of the preceding Claims, characterized in that the thickenings in the direction of the cooling fin approximately almond-shaped or streamlined run and in the direction of the normal of the cooling fin are spatially less extensive as the distance to the next adjacent Fin. Electric motor according to at least one of the preceding Claims, characterized in that at least some, in particular at least four, the fasteners lie in one plane Electric motor according to at least one of the preceding Claims, characterized in that the thickenings in the direction of the normal cooling fin spatial less extensive than half the distance to the next adjacent cooling fin for reducing the negative influence on the cooling air flow. Electric motor according to at least one of the preceding Claims, characterized in that the thickenings blind holes and / or Include centering aids Electric motor according to at least one of the preceding claims, characterized in that at least four first of the fastening means lie in a first plane and at least four second of the fastening means lie in a second plane which is arranged perpendicular to the first plane is. Electric motor according to at least one of the preceding Claims, characterized in that two fastening means, in particular with blind hole, for the detachable Connection with a rating plate and four other fastening means, in particular with centering aids for a tool, for the detachable connection with a foot plate, so Mounting plate, are provided, in particular in the area of the first Level.