EP1497903A1

EP1497903A1 - Drive arrangement with a fixed bearing

Info

Publication number: EP1497903A1
Application number: EP03727185A
Authority: EP
Inventors: Joachim Hirt; Norbert Esly
Original assignee: LuK Lamellen und Kupplungsbau Beteiligungs KG; LuK Lamellen und Kupplungsbau GmbH
Current assignee: Schaeffler Buehl Verwaltungs GmbH; LuK Lamellen und Kupplungsbau GmbH
Priority date: 2002-04-10
Filing date: 2003-04-10
Publication date: 2005-01-19
Also published as: DE10316435A1; CN1331298C; FR2838575A1; DE10391628A5; KR20040097324A; CN1659763A; WO2003088453A1; KR100977644B1

Abstract

The invention relates to a drive arrangement with a unit comprising stator, rotor and fixed bearing in which a shaft of the motor is mounted, housed in a motor housing. An injection moulded piece comprises a plug piece on an external annular piece, which comprises a branch supply line, connected to the coil of the stator and a sensor line connected to a sensor circuit board, whereby said sensor circuit board comprises at least one sensor. The injection moulded piece further comprises an inner annular piece in which the fixed bearing is arranged on the side axially opposed to the shaft output of the drive arrangement.

Description

Motor arrangement with a fixed bearing

The present invention relates to a motor arrangement with a unit with stator and rotor that can be arranged in a motor housing and with a shaft of the rotor that is mounted in a fixed bearing.

In known motor arrangements, the fixed bearing is usually arranged on the side of the shaft output of the motor.

The object of the present invention is to improve the behavior of such a motor under vibration loads.

This object is achieved by a motor arrangement in which an injection molded part is provided which has a plug part on an outer ring part, which comprises a phase current line connected to the coil of the stator and a sensor line connected to a sensor board, the sensor board having at least one sensor. The molded part also has an inner ring part in which the fixed bearing is arranged on the side axially facing away from the shaft output of the motor arrangement.

The main advantage of the present invention is that because of the arrangement of the fixed bearing on the side facing away from the shaft output of the motor, the center of gravity of the present motor arrangement can be shifted further towards the screwing surface of the motor housing, which is why the behavior of the motor arrangement according to the invention in the case of vibration loads is improved. The fixed camp can preferably be arranged in a bearing receiving part of the inner ring part, or be supported directly on this.

In a preferred embodiment of the invention, the sensor board is fixed to the inner ring part. But it can also be held by the sensor line, which is fixed in the outer ring part. The sensor board preferably also has an electrical component that interacts with the sensor.

The phase current line and the sensor line are expediently produced in the form of a lead frame, the regions of the lines leading to the sensor circuit board or the stator being fixed or embedded in the outer ring part. During the manufacture of the motor arrangement, the lines connected to one another in the lead frame by an external bridge part can be separated from one another at a suitable time during the manufacture of the motor arrangement by removing the bridge part.

Between the outer ring part and the inner ring part of the molded part there is at least one channel in which the ends of the strand current line and the sensor line with the stator coil or the sensor board are accessible before the introduction of a sealing compound. As a result, the electrical connections between the sensor circuit board and the sensor line and between the stator coil and the phase current line can be easily established because of the good accessibility. The plug part or its body is injection molded onto the circumference of the outer ring part, regions of the strand current line and the sensor line being embedded in the body of the plug part. This results in a particularly good fixation of the lines mentioned. In a particularly preferred embodiment of the invention, radially on the inside, annular seals for sealingly attaching the motor housing and / or for sealingly attaching a cover part are arranged on the body of the plug part, preferably by injection molding.

The fixed bearing is fixed by a fixing part which is supported on the inner ring part. The side of the stator facing the plug part preferably engages in a receiving opening in the body of the plug part. The space between the outer and inner ring part, the areas of the current feed line and the sensor line arranged therein, and optionally the fixing part and the stator, are expediently cast into a unit by a casting compound and fixed to one another. A particularly stable unit results if the potting compound also encloses and fixes the outside and the side of the stator facing away from the plug part. The rotor with the shaft and a floating bearing arranged thereon on the side facing away from the plug part are inserted into the stator in such a way that the area of the shaft passing through the fixed bearing is fastened to the outside of the fixed bearing, preferably by prying. The floating bearing can also be attached to the shaft by prying. The motor housing is axially pushed onto the stator and the floating bearing in one manufacturing step and attached to the body of the plug part and fixed thereon. It is advantageous that the force acting on it is conducted over the stator block. Particularly advantageously, a fastening area of a cover part attached from the side of the fixed bearing overlaps the end of the motor component facing the cover part. housing. In this way, the motor housing and the cover part are fastened to one another on the one hand and, on the other hand, to the unit of the motor arrangement at the same time.

The motor arrangement according to the invention and its configurations are explained in more detail below in connection with the figures. Show it:

Figure 1 shows a lead frame and a sensor board of the motor assembly according to the invention;

Figure 2 shows the connector part of the motor assembly according to the invention;

Figure 3 shows the stator block of the motor assembly according to the invention;

Figure 4 shows the stator block of Figure 3 in the potted state;

Figure 5 shows the insertion of the rotor assembly in the motor assembly according to the invention;

Figure 6 shows the mounting of the motor housing on the arrangement of Figure 5; and

Figure 7 shows the finished motor assembly according to the invention.

According to FIG. 1, a so-called lead frame of the present motor arrangement comprises a sensor line 2 and a line current feed line 3, which are connected to one another via a bridge part 4 (broken lines), which is later used at a suitable time point can be separated. The sensor line 2 and the line current supply line 3 are fixed in a molded part 5, which is preferably of annular design and has an outer ring part 5-1 and an inner ring part 5-2. The lines 2, 3 mentioned are preferably partially embedded in the outer ring part 5-1.

On the inner ring part 5-2 of the molded part 5, pins 6 are preferably arranged, which receive a sensor board 7 and are preferably thermoformed for fastening the sensor board 7. The sensor board 7 can also be received or held via the lead frame 3. It is electrically conductively connected to the lead frame 3 by an axial channel 9 via a supply of heat. The lead frame 3 can be separated into the individual lines 2 and 3 by separating the bridge part 4. The sensor board 7, which comprises a sensor (not described in more detail) and preferably also electronics, can be checked electrically after the bridge part 4 has been disconnected. The molded part 5 then receives the lead frame 3 and the sensor board 7 and it preferably contains bearing surfaces of a bearing receiving part 8 for the fixed bearing 14 of the motor arrangement.

In an alternative embodiment, the inner ring part 5-2 of the molded part 5 has no bearing receiving part. In this case, the fixed bearing is axially supported directly on a contact surface 1 of the inner ring part 5-2.

The molded part 5 has at least one channel 9, which preferably extends and opens in the axial direction on both sides and through which the end region of the current supply line 3 arranged in the molded part 5 runs for later contacting. The end of the sensor line 2 is also accessible in the channel 9 for contacting. According to FIG. 2, the plug part 10 is injection molded onto the molded part 5, more precisely onto the outer ring part 51 thereof. The plug part 10 includes all functions of the plug part and additionally receives the molded part with the lead frame 1 or the lines 2, 3 and the sensor board 7. Furthermore, the plug part 10 also has the radial contours for later accommodation or arrangement and connection to a motor housing 25 (FIG. 6). On the plug part 10, seals 11, 12 can be arranged, preferably injection-molded, on both sides of the plug part, which enable a tight connection to the motor housing 25 and a cover part 26, as will be explained later. When arranging the seals 11, 12, care must be taken that they completely define the sealing surfaces on the body of the plug part 10, in order to prevent the plug part 10 and the molded part 5 from infiltrating. The maximum permissible temperatures for the sensor board 7 and its connections must be observed when injecting the plug part 10.

According to FIGS. 3 and 4, the stator 13, the plug part 10, the fixed bearing 14 and the bearing fixation 15 are subsequently placed by means of a device. The coil strand 16 and the sensor circuit board 7 are electrically conductively connected to the strand energization line 2 and the sensor line 3, respectively. The axial channels 9 of the molded part 5 offer the appropriate space for this. The device for placing makes it possible to align the sensor system with the coils. This is done with a magnet 30 defined for the stator 13 (FIG. 5). This results in an optimized commutation signal and thus better motor utilization. To align, the stator coils and sensors can also be contacted via the plug part 10 and the alignment can be achieved via the fields generated. A mechanical assignment from coil to sensor via the device is possible. The fixed bearing 14 and then its fixing part 15 are inserted into the inner ring part 5-2 connected to the plug part 10. These are held axially (possibly under preload).

According to FIG. 4, the coil body of the stator 13 is cast together with the plug part 10 and the inserted fixed bearing 14 and its fixing part 15 into a unit by means of a suitable casting compound 20. Here the complete sealing of the geometries is achieved. The stator 13 is sealed axially and radially in order to fix the cylindrical shape and the windings. The casting compound 20 also includes the sensor board 7 with its electronic components (sensor and electronics). The fixed bearing 14 is held between the molded part 5 (or the plug part 10) and the fixing part 15. The cast parts preferably each have undercuts in order to ensure a positive fit with the casting compound 20. Pay attention to the material of the casting compound 20 and its compatibility with the other materials and surfaces. For thermosets, e.g. attention must be paid to the outgassing and dissolving of the circuit board as well as the sealing and materials. In the case of thermoplastics, attention must be paid to the temperature compatibility of the individual components and, in the case of plastics, in general to the warpage and shrinkage behavior. The unit manufactured in this way can also be used without an additional motor housing. It can be inserted into an electric motor housing or e.g. into a gear housing.

According to FIG. 5, the assembly consisting of the rotor 21 and the motor shaft 22 is now mounted with an attached floating bearing 23 for the floating bearing point, spacer ring, magnet package and control magnet 30 aligned with this. The motor shaft 22 is inserted into the fixed bearing 14 and, as can be seen, preferably firmly fixed. The existing unit can be tested in one device without a motor housing.

According to FIG. 6, the unit mentioned can be inserted in an associated motor housing 25 for the construction of a drive ring or in a suitable screw-on geometry. When the stator is pressed into the motor housing 25, the force passes over the stator block.

On the motor housing 25, the shaft seal, the flange seal 33 and the seal 11 can be attached between the stator block and the motor housing 25, e.g. be vulcanized.

FIG. 7 shows the motor arrangement which is screwed to screw-on parts 27 in different planes. The cover part 26 engages behind the motor housing 25 with a fastening region 28, which preferably runs axially through the body of the plug part 10, or is clamped thereon.

The patent claims submitted with the application are proposals for formulation without prejudice for the achievement of further patent protection. The applicant reserves the right to claim further combinations of features previously only disclosed in the description and / or drawings.

Relationships used in subclaims indicate the further development of the subject matter of the main claim by the features of the respective subclaim; they are not a waiver of achieving an independent, opposing understand protection for the combination of features of the related subclaims.

Since the subjects of the subclaims can form their own and independent inventions with regard to the state of the art on the priority day, the applicant reserves the right to make them the subject of independent claims or declarations of division. They can furthermore also contain independent inventions which have a design which is independent of the objects of the preceding subclaims.

The exemplary embodiments are not to be understood as a restriction of the invention. Rather, numerous changes and modifications are possible within the scope of the present disclosure, in particular such variants, elements and combinations and / or materials, which, for example, by combining or modifying individuals in conjunction with those described in the general description and embodiments and the claims and features or elements or procedural steps contained in the drawings can be taken by the person skilled in the art with regard to the solution of the task and, through combinable features, lead to a new object or to new procedural steps or procedural step sequences, also insofar as they involve manufacturing, testing and working methods affect.

Claims

claims

1. Motor arrangement with a unit that can be arranged in a motor housing with a stator and rotor and with a shaft of the rotor that is mounted in a fixed bearing, characterized in that an injection-molded part is provided that has a plug part on an outer ring part that is connected to the coil of the Stator connected strand current line and a sensor line connected to a sensor board, wherein the sensor board has at least one sensor, and that the molded part has an inner ring part in which the fixed bearing on the

Shaft output of the motor assembly is arranged axially facing away.

2. Motor arrangement according to claim 1, characterized in that the sensor board is fixed to the inner ring part.

3. Motor arrangement according to claim 1 or 2, characterized in that the sensor board (7) is held by the sensor line which is fixed in the outer ring part.

4. Motor arrangement according to one of claims 1 to 3, characterized in that the sensor board comprises an electrical component interacting with the sensor.

5. Motor arrangement according to one of claims 1 to 4, characterized in that the strand current line and the sensor line (2) in the form of a lead frame have and are connected to each other via an external, separable bridge part, the areas leading to the sensor board or the stator being fixed or embedded in the outer ring part.

6. Motor arrangement according to one of claims 1 to 5, characterized in that there is at least one channel between the outer ring part and the inner ring part of the molded part, in which the ends of the current supply line and the sensor line (2) for contacting the stator coil or Sensor board are accessible before inserting a sealing compound.

7. Motor arrangement according to one of claims 1 to 6, characterized in that the plug part is molded onto the circumference of the outer ring part, regions of the strand current line (3) and the sensor line are embedded in the body of the plug part.

8. Motor arrangement according to claim 7, characterized in that on the body of the plug part, seen radially on the inside, annular seals for sealingly attaching the motor housing on the side facing away from the fixed bearing and / or for sealingly attaching a cover part on the side facing the fixed bearing, preferably are injected.

9. Motor arrangement according to one of claims 1 to 8, characterized in that the fixed bearing arranged in a bearing receiving part of the inner ring part or the fixed bearing which is supported directly on a contact surface of the inner ring part is fixed by a fixing part which is supported on the inner ring part.

10. Motor arrangement according to one of claims 1 to 9, characterized in that the side of the stator facing the plug part engages in a receiving opening of the body of the plug part.

11. Motor arrangement according to one of claims 1 to 10, characterized in that the space between the outer and inner ring part, the regions of the strand current line and the sensor line arranged therein, and optionally the fixing part (15) and the stator, are cast into a unit by a casting compound and are fixed to each other.

12. Motor arrangement according to claim 11, characterized in that the sealing compound also encloses and fixes the outside and the side of the stator facing away from the plug part.

13. Motor arrangement according to one of claims 1 to 12, characterized in that the rotor with its shaft and a floating bearing arranged thereon on the side facing away from the plug part is inserted into the stator, the area of the shaft passing through the fixed bearing preferably being on the outside on the fixed bearing is attached by prying.

14. Motor arrangement according to claim 13, characterized in that the motor housing (25) is pushed axially onto the stator and the floating bearing and is attached to the body of the plug part and is fixed thereon.

5. Motor arrangement according to one of claims 8 to 14, characterized in that the cover part is arranged on the side facing the fixed bearing and is connected via a fastening part to the side of the motor housing facing the fixed bearing.