WO2012123108A2

WO2012123108A2 - Electrical plug area of an electric motor

Info

Publication number: WO2012123108A2
Application number: PCT/EP2012/001128
Authority: WO
Inventors: Ismet Sacit SOYUBEY
Original assignee: Wilo Se
Priority date: 2011-03-14
Filing date: 2012-03-14
Publication date: 2012-09-20
Also published as: WO2012123108A3; DE102011013952B4; DE102011013952A1

Abstract

The invention relates to an electric motor (1) for driving a pump, particularly a circulating pump for heating systems, having a motor housing (2) made of metal and a plug area (3) comprising an electrical plug part (4) having a plurality of plug contacts (5, 6) that can be plugged into mating plug contacts (29) of a mating plug area (30) of an electronics housing (28) of the electric motor (1). The plug part (4) is held in a floatingly movable manner on the motor housing (2), so that the assembly of the electronic housing (28) on the electric motor (1) can be done simply and without damage.

Description

Electrical plug-in area of an electric motor

The invention relates to an electric motor for driving a pump, in particular a circulation pump for heating systems, with a motor housing made of metal and a plug-in area, which has an electrical plug part with a plurality of plug contacts, in mating plug contacts of a mating plug

Electronics housing of the electric motor are pluggable.

Electric motors generally have a so-called terminal box, in which the electrical connections of the windings of the stator and / or the rotor are for contacting. The terminal box is on the motor housing of the

Electric motor attached. In addition, it is common in electric motors for pumps to arrange in the terminal box immediately the electronics for controlling the electric motor, in particular a frequency converter with his

power electronic components. The terminal box thus forms a

Electronics housing in which the control electronics for the electric motor

is housed. In modern pump controls are also controls on the electronics housing, and is optionally also a display for displaying pump and / or engine-specific data and for adjusting the electric motor or the pump available. Due to this extensive electronics, the electronics housing already has a considerable weight.

For cooling the power semiconductors, it is known to produce the electronics housing from metal and the power semiconductors in heat-conducting contact with the

CONFIRMATION COPY To bring housing so that the heat of the power semiconductors can be dissipated via the electronics housing. Due to this design, the electronics housing can reach a weight between 10 kg and 20 kg and are therefore usually screwed tightly to the electric motor housing, wherein the electrical contacting of the motor via screw terminals, which are placed in the interior of the electronics housing, where they open lid the electronics housing are accessible.

For smaller electric motors for pumps of lower power are

Plug connections between motor and electronics housing known. For example, DE 200710022070 A1 describes an electric motor with a stator, wherein the electrical contacting of the windings of the stator takes place via a plug element fixedly connected to the stator, which is essentially connected to the stator end, i. is arranged with respect to a side facing away from the pump side of the stator to be realized centrifugal pump. An attachable to the motor housing housing part comprises in its interior at least one plug for contacting the

Male member. The housing part is attached to the upper side of the motor housing and rests on this.

For stationary electric motors, i. Electric motors, the drive shaft is vertical, such a connector outside the motor housing disadvantageous because the weight between 0 and 20 kg heavy electronics housing at least partially on the connector. In addition, the rigidly connected to the motor housing or the stator plug member can be damaged when placing the terminal box, when the assembly of the electric motor and electronics housing is not exactly aligned but slightly angled. The plug element could break in this case.

Furthermore, the exact alignment of the electronics housing to the electric motor, respectively to its mating area not only difficult because of the weight, since the mating area is behind the electronics housing and therefore is not visible to the fitter. He can only guess where the plug-in area of the electric motor and the corresponding mating plug-in area of the electronics housing are to put these together. The joining step must be accurate to the millimeter and is therefore consuming. In addition, the production of the individual parts must be very precise to each other, so that the assembly of electric motor and electronics housing is easy and fast. However, this increases the cost of production.

The present invention is therefore an object of the invention to provide an electric motor for a pump with an electrical plug-in range available, which ensures a simple, safe and damage-free placement of the electronics housing on the electric motor.

This object is solved by the features of claim 1. advantageous

Further developments of the invention are specified in the subclaims.

According to the invention, an electric motor for driving a pump, in particular a circulating pump for heating systems, proposed with a motor housing made of metal and a plug-in area having an electrical connector part with a plurality of plug contacts, which are plugged into mating plug contacts of a mating plug of an electronic housing of the electric motor, wherein the plug part floating is movably held on the motor housing.

Due to the floating mobility of the plug part on the motor housing, the joining of the electronics housing and the electric motor can be done with a certain amount of play. This means that the electronics housing can be placed on the plug-in area of the motor housing to a slight extent askew. This facilitates on the one hand the placement, because the plug part can align with the mating plug contacts of the mating plug-in area. On the other hand prevents the mobility that breaks the plug part due to a mechanical stress caused by an oblique touch and / or that the plug contacts or

Mating plug contacts are bent. Floating within the meaning of the invention thus means that the plug parts in both the lateral direction, i. is movable in a plane sideways to a limited extent, as well as slightly about its elevation axis, i. around the normal at that level can be tilted.

In an embodiment of the invention, the plug part power contacts for energizing the electric motor and signal contacts for the transmission of sensor or control signals. As a result, a compact connector part on

Electric motor provided that allows the contacting of all electrical components in the electric motor, in particular the contacting of the stator and one or more sensors, such as speed sensor,

Temperature sensor, pressure sensor and / or vibration sensor, which may be arranged inside the pump and / or the electric motor. Also, the rotor via the plug part in the case of an embodiment of the electric motor as

Asynchronous motor can be energized with squirrel cage. Another, separate

Plug-in area no longer has to be provided on the motor.

In an advantageous embodiment, the motor housing may have a projecting from its outer wall collar which surrounds the plug part at a distance with play and limits its lateral movement. The collar forms a wall which encloses the plug part. Due to the distance between plug part and collar, the plug part can sideways in a plane at least slightly

be moved. With reference to the motor shaft, this plane is preferably parallel to the motor shaft axis. That is, when the electric motor is stopped, i. vertical motor shaft, also this plane is vertical. Through the game between plug part and collar, the plug part is kept floating on the motor housing. Further, because of its distance from the collar, the male part may be slightly extended about a further axis, namely the in-plane normals, i. be rotated by a few degrees, in particular a maximum of 8 °. The angle of rotation depends on the distance between collar and plug part. At maximum rotation, sideways movement is no longer possible, because the plug part already abuts the inside of the collar. Finally, the plug part can also be easily pivoted due to the game between collar and plug part by the normal

slightly inclined to one side. Again, the angle of inclination of the distance between the collar and plug part depends. However, it is preferably at most 10 °, in particular between 2 ° and 8 °. Will the normal at

vertical electric motor is horizontal, in particular runs radially to the motor axis, inclined to the right or left, there is a slight pivoting movement of the

Plug parts around the vertical axis of the plug part. Preferably, the distance between the collar and the plug part at the sides between 0.2 mm and 2 mm, in particular 0.2 and 1 mm. The distance need not be equal to the entire circumference of the plug part. However, it should be such that it allows at least one movement of the male part within the collar by 0.5 mm to 1 mm.

The plug contacts of the plug part can protrude with respect to the collar. This has the advantage that the cutting planes between the plug contacts of the plug part and the mating plug contacts of the electronics housing deep in the

Mating plug portion of the electronics housing rests, so that a high protection against ingress of water and moisture is given at the mating area.

In a preferred embodiment, the plug part on its outer wall projecting projections, with which the plug part is held on the motor housing and / or on the collar.

Preferably, the plug part can be at least a first tongue-shaped

Projection, preferably two tongue-shaped first projections, which in a receiving space rests on the inside of the collar / einliegen. About the first projection or the first projections, the plug part is mounted at a first location on the motor housing. The receiving space may be formed by a base which is covered or coverable towards the open end of the collar by a cover, so that the first projection or the first

Projections, between the base and the cover is or lie. In this embodiment, the plug part can be used with its first projection or its first projections in the plug-in area and then held by means of the cover stationary in the receiving space.

The cover may for example be formed by the head of a screw which is inserted into a threaded bore of the base. The projection or the projections are in this case between the base and the screw head. It is important to ensure that the screw is not tightened too far, so that the plug part is not clamped at its first projection / its first projections. This can be done, for example, that the Tapped hole in the base has a bottom at a certain depth such that the screw abuts against the ground before the screw head the

Clamping tabs. Alternatively or in combination, the base may have at least one extension on which rests the cover, in particular the screw head, wherein the height of the extension is greater than the height of the first projection, so that the plug part remains movable in the receiving space.

In addition or as an alternative to the said first projection, the plug part may have at least one second projection and one third projection, which are spaced apart and between which a part of the motor housing or of the collar rests with play. By means of the second and the third projection, the plug part can be loosely attached or secured at a second location on the motor housing or on the collar. Preferably, the second and third

Projection on the opposite side of the first projection of the plug part arranged, so that the plug part at two opposite points on

Motor housing is held stable.

For example, the second projection may be hook-shaped and engage under the motor housing. Alternatively, on the inner wall of the collar, a projection, in particular rib-shaped, which lies between the second and third projection. Thus, the plug member is held loosely movable at the second location, the distance between the second and the third projection is slightly, in particular 0.2 mm to 0.6 mm larger than the wall thickness of the motor housing or the thickness of the rib on the collar. In a preferred embodiment, two third projections are provided, which are nose-shaped and

symmetrical to the second projection or next to each other.

According to the invention, the plug part can have a base, of which the

Plug contacts protrude toward the open end of the collar, and whose height is at least half the height of the collar. Due to the height of the base relative to the height of the collar, the inclinability of the plug part is limited with respect to the above-mentioned normals, preferably to a maximum of 10 °. Preferably, the collar is made in one piece with the motor housing made of cast aluminum. This has the advantage that the collar can be made a manufacturing step with the motor housing. Furthermore, the plug part made of glass fiber reinforced plastic, for example made of PET (polyethylene terephthalate) with 30% glass fiber content. This provides an excellent electrical

Isolation and strength.

In an embodiment of the invention one of the aforementioned

Embodiments, the plug-in area may have at least two sockets for receiving guide pins of the mating plug portion of the electronics housing, wherein the inside of the receiving means is conical. The jacks and the

Guide pins serve for fine guidance or alignment of the

Mating area relative to the plug-in area of the electric motor.

Furthermore, the plug-in area can have a further socket in which a grounding pin of the mating plug-in area of the electronics housing in its

attached state rests. Thus, a grounding of the motor housing is simultaneously effected by means of the plug-in area, so that the plug part need not have a separate grounding contact. At the same time, the grounding pin also serves for the mechanical guidance and alignment of the mating plug-in area relative to

Plug-in area. For an effective alignment, the other socket for the

Ground pin preferred on the two jacks for the guide pin

arranged opposite side of the mating region. Preferably, the sockets are integrally formed with the collar and lie inside the collar, so that the plug part is arranged between the sockets.

In a further embodiment variant, the collar can have a first recess and a second recess with respect to its height in cross-section, wherein the area between the first and the second recess of a plug-in sleeve of the mating plug portion of the electronics housing form fit

is encompassed. Before the second recess may be arranged a sealing ring whose diameter is greater than the height of the second recess. The

Plug-in sleeve thus encloses the plug-in area of the electric motor completely sealed. Further advantages and features of the invention will be explained below with reference to an embodiment and the accompanying figures. The same reference numbers mean the same components. Show it:

Fig. 1: Electric motor with plug-in area in plan view

Fig. 2: Section of an axial section through electric motor with plug-in area Fig. 3: plug part in a perspective view from above

Fig. 4: plug part in a perspective view from below

Fig. 5: longitudinal section through the plug-in area of the electric motor with mounted

electronics housing

Figure 1 shows an electric motor 1 according to the invention in plan view of the

Plug-in area 3. The electric motor 1 has a motor housing 2 made of metal and is placed vertically to drive a pump, not shown, so that its motor shaft 24 is vertical. On the circular cylindrical motor housing 2 off

Cast aluminum are arranged on four sides in the longitudinal direction parallel cooling fins 22, which are covered by cooling air, which is generated by a ventilation wheel 23 at the upper end of the motor shaft 24. The motor housing 2 is surrounded by an outer housing, not shown, through which a flow channel for the cooling air is formed.

The plug-in region 3 is arranged on one of the four outer sides of the motor housing 2 between the cooling ribs 22. He has an electrical connector part 4

Glass fiber reinforced plastic (PET) with a plurality of plug contacts 5, 6, which can be plugged into mating plug contacts 29 of a mating plug portion 30 of an electronic housing 28 (see Figure 5) of the electric motor 1. A first group of

Plug contacts forms six power contacts 5, which for energizing the

Windings U1, V1 and W1 serve. Further power contacts 5 can be connected in order to supply additional windings (U1) *, (V1) * and (W1) * with power if required. A second group of plug contacts is formed by eight signal contacts 6 for the transmission of measurement signals from sensors which are located inside the sensor

Electric motor 1 or the pump are arranged. Even with the signal contacts 6, it is not necessary that all of the existing plug contacts mandatory are interconnected. Rather, this can be done according to needs, whether and how many sensors are arranged in the electric motor, for example, temperature sensors and / or pressure sensors for the pumped medium.

The plug part 4 is floatingly held on the motor housing 2. It can thus be turned to the sides, i. slightly in a plane until it encounters a boundary. Furthermore, it is rotatable about a normal to this plane by a few degrees and may be slightly, i.e. be tilted by a few degrees, said normal is tilted to one side. For this purpose, the plug part 4 on one side two adjacent, tongue-like projections 8 which are at least partially under a screw head 11. At the tongue-like projections 8 opposite side of the male part 4 are two

adjacent, nose-shaped projections 13 integrally formed, which rest loosely on the motor housing 2.

The plug-in region 3 further has a collar 7, which is integrally formed on the motor housing 2 and projects from its outer wall. The collar 7 surrounds the

Plug part 4 at a distance and limits its lateral movement in the plane, i. in two directions of movement, namely with respect to a vertical motor axis horizontally and vertically. The distance between the collar 7 and the plug part 4 on the parallel sides is about 0.5 mm, so that a total lateral movement of the plug part 4 of about 1 mm is possible.

The plug-in area 3 also has two guide bushes 17 for receiving

Guide pin 27 of the mating portion 30 of the electronics housing 28, wherein the inside of the guide bushes 17 is conical, see Figure 5. The collar 7 is integrally in the wall of the guide bushings 17 and forms each part of these walls. In addition, the plug-in portion 3, a grounding socket 8 in the form of a blind hole in which an unillustrated grounding pin of the

Mating plug portion 30 of the electronics housing 28 rests in the assembled state of the electronics housing 28.

Figure 2 shows a part of the electric motor 1 in an axial section through the

Plug-in area 3. The plug contacts 5, 6 of the plug part 4 are opposite to the Collar 7 before. They are at a height with guide bushings 17, of which only one can be seen in FIG. Between the guide bushings 17, a base 10 is integrally formed on the motor housing 2, in which a threaded bore 14 is provided. In the threaded hole 14, a screw 25 is received. The base 10 is extended in the axial direction by a truncated projection 15 and a projection 5 opposite bank-shaped support 26. The screw 25 is screwed so far into the thread guide 14, that they on the extension 15 and the

Edition 26 rests. The extension 15 is located between the tongue-like projections 8 and has a height which is slightly greater than the height of the tongue-like projections 8, so that the projections are movable in a receiving space, through the base 10, the screw head 11 and laterally through the Wall of the guide bushes is limited. About the tongue-like projections 8 is the

Plug part 4 held on the inside of the collar 7 on the motor housing 2.

Furthermore, FIG. 2 shows that the plug part 4 has a hook-shaped projection 12 on the opposite side. This projection 12 protrudes from the plug part 4 inwardly into the electric motor 1 and has at its radial end an angled leg which extends parallel to the motor housing 2 and engages under this. The hook-shaped projection 12 limits the mobility of the male part 4 to the outside, i. in the direction of the above normals. On the outside of the motor housing 2, furthermore, the lug-shaped projections 13 rest loosely, with the result that the motor housing 2 is located between these projections 13 and

hook-shaped projection 12 rests.

The collar 7 has with respect to its height in cross-section a first recess 9 and a second recess 20. The area between the first and the second recess 19, 20 in the mounted state of the electronics housing (Fig. 5) by a plug-in sleeve 31 positively embraced. Before the second recess 20, a sealing ring 21 is arranged, whose diameter is greater than the height of the second recess 20. Figure 5 shows how the plug-in sleeve 31 engages around the region of the collar 7 between the first and the second recess 19, 20, wherein the sealing ring 21 sealingly between the collar 7 and the plug-in sleeve 31 is located. Figures 3 and 4 show that the plug part 4 in a perspective view. It has a hollow base 16, from which the plug contacts 5, 6 protrude. The base 16 has about two-thirds of the height of the collar 7, so that the pivotability of the male part along the vertical axis is limited to a few degrees.

On the inside of the base 6 reinforcing ribs 9 are arranged, which extend from a side wall to the opposite side wall of the base 16 and each between two power contacts 5 different phase, as well as between the power contacts 5 and 6 signal contacts. The

Reinforcing ribs 9 thereby form an additional insulation and prevent

Leakage currents between the contacts 5, 6.

LIST OF REFERENCE NUMBERS

1 electric motor

2 motor housing

3 plug-in area

4 plug part

5 power contacts

6 signal contacts

7 collar

8 tongue-shaped projection

9 reinforcing ribs

10 sockets

11 cover / screw head

12 Hook-shaped projection

13 Nose-shaped projection

14 threading

15 extension

16 sockets of the plug part

guide bush

18 grounding socket

19 First return

20 second return

21 sealing ring cooling fins

fan

motor shaft

screw

Bank-shaped support Guide pins Electronics housing Mating connectors Mating connector area Plug-in socket

Claims

claims

1. Electric motor (1) for driving a pump, in particular one

Circulation pump for heating systems, comprising a motor housing (2) made of metal and a plug-in area (3), which has an electrical plug part (4) with a plurality of plug contacts (5, 6) in mating plug contacts (29) of a

Mating plug region (30) of an electronics housing (28) of the electric motor (1) can be plugged, characterized in that the plug part (4)

floating on the motor housing (2) is held.

2. Electric motor according to claim, characterized in that the

Plug part (4) power contacts (5) for energizing the electric motor (1) and signal contacts (6) for transmitting sensor or control signals.

3. Electric motor according to claim 1 or 2, characterized in that the

Motor housing (2) has a projecting from its outer wall collar (7) which surrounds the plug part (4) at a distance with clearance and limits its lateral movement.

4. Electric motor according to claim 3, characterized in that the distance between the collar (7) and the plug part (4) on the sides between 0.2 mm and 1 mm.

5. Electric motor according to claim 3 or 4, characterized in that the plug contacts (5, 6) of the plug part (4) protrude relative to the collar (7).

6. Electric motor according to one of the preceding claims, characterized

characterized in that the plug part (4) on its outer wall protruding projections (8, 12, 13), with which the plug part (4) on

Motor housing (2) and / or on the collar (7) is held.

7. Electric motor according to one of claims 3 to 7, characterized in that the plug part (4) has at least one first tongue-shaped projection (8), preferably two tongue-shaped first projections (8), in a receiving space on the inside of the collar (7) is / are present.

8. Electric motor according to claim 7, characterized in that the

Receiving space is formed by a base (10) which is at least partially covered by the cover (1) or coverable to the open end of the collar (7), so that the first projection (8) between the base (0) and the Cover (1) is located.

9. Electric motor according to claim 8, characterized in that the

Cover (11) is formed by the head of a screw which is inserted into a threaded bore (4) of the base (10).

10. Electric motor according to claim 8 or 9, characterized in that the

Base (10) has at least one extension (15) on which the cover

(11) rests, wherein the height of the extension (15) is greater than the height of the first projection (8). 1. Electric motor according to one of the preceding claims, characterized

in that the plug part (4) has at least one second projection

(12) and a third projection (13), which face each other at a distance and between which a part of the motor housing (2) or the collar (7) rests with play.

12. Electric motor according to claim 11, characterized in that the second and the third projection (12, 13) relative to the first projection (8) on the plug part (4) is arranged.

13. Electric motor according to claim 11 or 12, characterized in that the second projection (12) is hook-shaped and engages under the motor housing (2).

14. Electric motor according to one of claims 3 to 13, characterized in that the plug part (4) has a base (16), of which the

Plug contacts (5, 6) projecting towards the open end of the collar (7), and whose height is at least half the height of the collar (7).

15. Electric motor according to claim 1, characterized in that the collar (7) is made in one piece with the motor housing (2), in particular made of cast aluminum.

16. Electric motor according to one of the preceding claims, characterized

characterized in that the plug-in area (3) at least two

Guide bushes (17) for receiving guide pin (27) of the

Mating plug portion (30) of the electronics housing (28), wherein the inside of the guide bushes (17) is conical.

17. Electric motor according to one of the preceding claims, characterized

in that the plug-in region (3) has a grounding bush (18) in which a grounding pin of the mating plug-in region (30) of the

Electronics housing (28) rests.

18. Electric motor according to one of claims 3 to 17, characterized in that the collar (7) with respect to its height in cross-section a first recess (19) and a second recess (20), wherein the area between the first and the second recess (19, 20) by a plug-in sleeve (31) of the mating plug region (30) of the electronics housing (28) is positively embraced.

19. Electric motor according to claim 18, characterized in that before the second recess (20) a sealing ring (21) is arranged, whose diameter is greater than the height of the second recess (20).

20. Electric motor according to one of the preceding claims, characterized

characterized in that the plug part (4) made of glass fiber reinforced

Plastic exists.