EP3363104A1 - Anti-interference module for an electrically commutated electric motor, method for producing an anti-interference module, and vehicle comprising such an anti-interference module - Google Patents

Abstract

The invention relates to an anti-interference module (5) for an electrically commutated electric motor (2). The anti-interference module has the following components: - a circuit support (5.1), - an electronic circuit assembly (5.2) which is arranged on the circuit support (5.1), - an encapsulation (5.3) which surrounds the electronic circuit assembly (5.2) in a formfitting and bonded manner, and - at least one interface (5.4) which is provided for electrically contacting the electronic circuit assembly (5.2) with a control unit (4) of the electrically commutated electric motor (2). The invention further relates to a method for producing such an anti-interference module (5) and to a vehicle (1) comprising such an anti-interference module (5).

Description

description

Suppression module for an electrically commutated electric motor, method for producing a suppression module and vehicle with such suppression module

The invention relates to a suppression module for an electrically commutated electric motor. The invention further relates to a method for producing such a suppression module and to a vehicle having such a suppression module.

Electrically commutated electric motors are well known and are distinguished by a reduced number of wearing parts compared to brush-commutated electric motors. For example, such electric motors are used in ^¬ driven vehicle, which together form a gear motor in combination.

The control of such an electric motor is carried out, for example, by means of a pulse width modulated

Power electronics in a control unit, z. B. a transmission control unit is integrated. A circuit of the power electronics ^¬ includes three voltage divider, the input voltage, z. B. a supply voltage of 12V of a vehicle electrical system, split into three phase voltages, which are offset in time by, for example, 120 ° to each other. That is, the electric motor is operated with a three-phase alternating current. Since the phase voltages due to the pulse width modulation may have undesirable voltage spikes, suppression to smooth the phase voltages is required. For example, as suppression components ceramic capacitors or electrolytic capacitors are used, which, however, have a low temperature stability.

The invention is therefore based on the object, a comparison with the prior art improved suppression module for a specify electrically commutated electric motor. The invention is further based on the object of specifying a suitable method for producing such a suppression module as well as a vehicle improved with respect to the prior art with such a suppression module.

Advantageous embodiments of the invention are the subject of the dependent claims. With regard to the suppression module, the object is achieved according to the invention with the features specified in claim 1. With regard to the method, the object is achieved with the features specified in claim 9. With regard to the vehicle, the object is achieved according to the invention with the features specified in claim 10.

A suppression module for an electrically commutated electric motor comprises a circuit carrier, an electronic scarf ^¬ tion arrangement, which is arranged on the circuit substrate, an encapsulation, which surrounds the electronic circuitry positively and cohesively, and at least one interface, which for electrical contacting of the electronic circuit arrangement with a control unit of the electrically commutated electric motor is provided.

A separate from the control unit of the electric motor suppression module allows the assembly of the circuit substrate with the electronic circuit arrangement, which in particular

Entstörbauteile includes, outside of an electronics compartment of the control unit. Since suppression components, z. B. Elektrolytkondensa ^¬ tors, usually require a lot of space and also have only a low temperature stability, by means of he ^¬ inventive separate suppression module space-optimized placement of the suppression and extended compared to the prior art lifetime of the electronic

Circuit arrangement possible. Furthermore, the suppression module compared to the prior art can be much flatter and modular scalable. An exchange in case of repair of the suppression module is possible in a simple manner. In addition, the suppression module is separately produced to the control unit and there is no separate housing on the control unit to protect the suppression required because the electronic scarf ^¬ tion arrangement by the encapsulation of external influences, eg. B. gear oil is protected.

For example, the interference suppression can be coupled with a Getriebesteu ^¬ ergerät which drives a geared motor of a vehicle. Here, the control unit is the transmission control unit and the electric motor together with a transmission of the vehicle, the geared motor.

According to one embodiment of the invention, the interface for electrical contacting of the suppression module is formed as a stamped grid, which is integrated in the circuit carrier.

In alternative embodiments, the interface comprises an exposed contact surface, which is electrically connected to the electronic circuit arrangement via an electrical line element integrated in the circuit carrier. A side facing away from the control unit of the suppression module expediently has no open electrical contact points, so that short circuits can be avoided.

Furthermore, the interface can be configured as a plug module in accordance with an embodiment of the invention having the Kon ^¬ clock pin positively and cohesively more encapsulation surrounding at least ^¬ an electrical contact pin and a. The suppression module can be connected to the control unit in a simple manner.

Preferably, the encapsulation and the further encapsulation are integrally formed with each other. For a production of the suppression module with a connector module is particularly simple feasible, since the formation of a separate housing deleted.

A connection of the electronic circuit arrangement with the circuit carrier is preferably carried out by means of material connection. For example, the electronic circuit arrangement is glued to the circuit carrier, for. B. by means of a Wärmeleitkle ^¬ bers. Alternatively, the electronic circuit arrangement can also be soldered or welded onto the circuit carrier. In addition, it is possible to provide bonding wires for electrically contacting the electronic circuit arrangement with the circuit carrier. In addition, a mechanical fixation, z. B. via a screw, a socket or by means of a holding geometry, z. B. a retaining clip possible.

As suppression components, the electronic circuit arrangement has at least one capacitor, for. As a ceramic capacitor or an electrolytic capacitor on. It is further to provide a method for producing a suppression module for an electrically commutated electric motor, wherein an electronic circuit arrangement is arranged and fixed on at least one flat side of a scarf ^¬ tion carrier, wherein at least one interface for electrically contacting the electronic circuit arrangement with a control unit of the electrically commutated electric motor is integrated in the circuit carrier, and wherein at least the electronic circuit arrangement is provided with a curable encapsulating material, which combines during curing with the electronic circuit arrangement form-fitting and cohesive and encapsulates them in one piece.

The method allows a simple and cost-effective production of a suppression module, which can be coupled in a simple manner with a control unit for controlling the electric motor. In addition, a vehicle is provided, which comprises an electrically commutated electric motor, a control unit for controlling the electric motor and an inventive Ent ^¬ noise module, which is at least electrically connected to the control unit.

The fact that by means of the suppression module a lifetime of the electronic circuit arrangement is increased, a function of the electric motor and thus z. B. a geared motor of the vehicle can be obtained long term. The vehicle is thus improved in terms of durability and function over the prior art.

Embodiments of the invention are explained in more detail below with reference to drawings.

Showing:

Figure 1 shows schematically a vehicle with a

 Electric motor, a control unit for

Control of the electric motor and a suppression module according to the invention,

2 shows schematically the suppression module in a

 general execution, and

Figures 3 to 6 schematically sectional views of

For interference suppression in various ^¬ refinements.

Corresponding parts are provided in all figures with the same reference numerals.

Figure 1 shows schematically a vehicle 1 in a greatly simplified manner.

The vehicle 1 comprises an electrically commutated electric motor 2, which in the present embodiment with a Transmission 3 of the vehicle 1 forms a geared motor GM and is controlled by a control unit 4.

For example, the transmission 3 is an automatic vehicle transmission whose driving steps are adjusted by means of the electric motor 2.

The electric motor 2 is electrically commutated and is thus designed as a brushless motor. The control of the electric motor 2 via the control unit 4, which in ^¬ example, a pulse width modulated operated power ^¬ electronics (not shown) has.

As already described above, the power electronics comprises three voltage dividers which have an input voltage, for. B. a supply voltage of 12V of a vehicle electrical system of the vehicle 1, split into three phase voltages, which are each offset by, for example, 120 ° to each other. D. h., The electric motor 2 is operated with a three-phase alternating current.

Since the phase voltages due to the pulse width modulation may have undesirable voltage peaks, an inventive suppression module 5 is provided, which is required for smoothing the phase voltages.

The suppression module 5 is connected to the control unit 4 electrically and optionally additionally mechanically and is manufactured and assembled as a separate module.

Figure 2 shows the suppression module 5 in a general embodiment in a greatly simplified manner.

The suppression module 5 comprises a circuit carrier 5.1, z. B. a so-called HDI printed circuit board on which an electronic circuitry 5.2 arranged and cohesively, z. B. by gluing, welding or soldering, is attached. The electronic circuit arrangement 5.2 comprises as Ent ^¬ interference components a predetermined number of capacitors, in ^¬ particular electrolytic capacitors and / or ceramic capacitors. An electrical contacting of the suppression components with the circuit substrate 5.1, for example, by means of

 Wire bonding, soldering, welding and / or using a thermal adhesive.

The encapsulation 5.3 surrounds all components on the circuit carrier 5.1, so in particular the electronic scarf ^¬ tion arrangement 5.2, completely and in one piece, so that they are protected from external influences, such. As chips, transmission oil, are protected.

Due to the one-piece design of the enclosure 5.3 and the spaces in the electronic circuitry 5.2 are closed, so that open interfaces are avoided. By means of the encapsulation 5.3, an optimum combination of electronic protection and a housing concept with a reduced space requirement compared with the prior art is made possible. Furthermore, due to the encapsulation 5.3 no separate housing is required.

Preferably, the encapsulation 5.3 of a curable material, for. As a thermoset, formed so that the shape and material bond between the encapsulation and the electronic

Circuit 5.2 is particularly easy to produce. The curable material can in this case by means of compression molding,

Transfer molding or alternatively be applied by injection molding.

Furthermore, the suppression module 5 comprises at least one

Interface 5.4, which is provided for electrical contacting of the electronic circuitry 5.2 with the power electronics of the control unit 4.

The interface 5.4 can be designed in various ways, which will be discussed in more detail in the following figures 3 to 6. FIGS. 3 to 6 show various exemplary embodiments of the suppression module 5, wherein the suppression module 5 is shown in a sectional view, in particular in a longitudinal section.

In Figure 3, the interface 5.4 is formed as a stamped grid S, wherein two mutually parallel electrical conductors are guided through the circuit substrate 5.1 and projecting from a populated flat side of the circuit carrier 5.1 upwards. The lead frame S is electrically connected to the electronic circuitry 5.2, z. B. via in the circuit substrate 5.1 extending punched grid sections. The populated flat side of the circuit substrate 5.1 is here, for example, a control unit 4 side facing. An unpopulated flat side of the circuit substrate 5.1 is facing away from the control unit 4, wherein over the bare flat side of the circuit substrate 5.1 projecting portions of the conductors are sealed with an electrically insulating material. Alternatively, the circuit carrier 5.1 can also be aligned differently relative to the control unit 4.

Alternatively, a cable or a press-in contact can be arranged or introduced in a similar manner as interface 5.4, with the latter being connected to the electronic interface

Circuit 5.2 each z. B, about one in the

Circuit carrier 5.1 integrated conductor track are electrically connected.

In Figure 4, the interface comprising 5.4 an exposed contact area K in the assembled flat side or alternatively on an opposite flat side of the Schaltungsträ ^¬ gers 5.1, which is connected to an integrated circuit carrier in the 5.1 line element L. The line element L may in this case likewise be a conductor track and is electrically connected to the electronic circuit arrangement 5.2. The electrical contact surface K is formed here either in the form of a surface-mounted component and soldered directly to the circuit substrate 5.1 or 5.1 as an open conductor surface of the circuit substrate, z. B. as a galvanized plate or as a copper surface formed. The contact surface ^¬ K is suitably made of an electrically conductive material, such. B. of metal or an electrically conductive ceramic. Preferably, in this case, the bare flat side of the

Circuit carrier 5.1 no open electrical contact points.

In the figures 5 and 6, the interface 5.4 is formed in each case as an integrated connector module SM, which has two mutually parallel contact pins KS, which are each bent at right angles above or in dependence on a space even below the populated flat side of the circuit substrate 5.1.

In Figure 5, the contact pins are surrounded by a further KS Cape ^¬ Selung KP, which is formed separately for encapsulation 5.3 the electronic circuitry of 5.2. In Figure 6, the encapsulation 5.3 and the further encapsulation KP are integrally formed with each other, so that they can be applied in the manufacture of the suppression module 5 in a common process step. By means of the plug-in module SM as interface 5.4, the suppression module 5 can be connected to the control unit 4 in a particularly simple manner. For this purpose, the control unit 4 has a socket corresponding to the plug module SM.

The electrical contact pins KS can in this case be arranged from both sides, for. B. by means of insertion and then both sides soldering, welding or gluing. alternative The electrical contact pins KS can also be soldered, welded or glued on one side.

Reference sign list

1 vehicle

 2 electric motor

 3 gears

 4 control unit

 5 suppressor module

 5.1 circuit carrier

 5.2 electronic circuitry 5.3 Encapsulation

 5.4 Interface

GM geared motor

 K contact surface

 KS contact pin

 KP further encapsulation

 L conduit element

 S punched grid

 SM connector module

Claims

claims 1. suppressor module (5) for an electrically commutated Electric motor (2) with a circuit carrier (5.1),  an electronic circuit arrangement (5.2) which is arranged on the circuit carrier (5.1),  - An encapsulation (5.3), which surrounds the electronic circuitry (5.2) positively and cohesively, and - At least one interface (5.4), which is provided for electrically contacting the electronic circuit arrangement (5.2) with a control unit (4) of the electrically commutated electric motor (2). 2. suppression module (5) according to claim 1, wherein the interface ^¬ (5.4) is formed as a stamped grid (S). 3. suppressor module (5) according to claim 1 or 2, characterized in that the interface (5.4) comprises an exposed contact surface (K), which is connected via a in the circuit carrier (5.1) integrated electrical line ^¬ element (L) electrically connected to the electronic circuitry (5.2). 4. suppressor module (5) according to any one of the preceding claims, wherein the interface (5. 4) as a plug-in module (SM) is formed from ^¬ which at least one electrical contact ^¬ pin (KS) and the at least one electric Kon ^¬ tact pin (KS) positively and materially surrounding further encapsulation (KP). 5. suppression module (5) according to claim 4, wherein the encapsulation (5.3) and the further encapsulation (KP) are integrally formed with each other. 6. suppression module (5) according to one of the preceding claims, wherein the electronic circuit arrangement (5.2) with the circuit carrier (5.1) is connected cohesively. 7. suppressor module (5) according to any one of the preceding claims, wherein the electronic circuit arrangement (5.2) has at least one capacitor. 8. suppression module (5) according to claim 7, wherein the at least one capacitor is formed as an electrolytic capacitor. 9. A method for producing a suppression module (5) for an electrically commutated electric motor (2), wherein an electronic circuit arrangement (5.2) is arranged and fastened on at least one flat side of a circuit carrier (5.1), - at least one interface (5.4) for electrical contacting of the electronic circuit arrangement (5.2) with a control unit (4) of the electric motor (2) in the scarf ^¬ tion carrier (5.1) is integrated, and - At least the electronic circuit arrangement (5.2) is provided with a curable encapsulating material, which during curing with the electronic Schaltungsanord- (5.2) positively and cohesively connects and these encapsulates a ^¬ part. 10. vehicle (1) comprising  an electrically commutated electric motor (2), - A control unit (4) for controlling the electric motor (2) and  - An Entstörmodul (5) according to one of claims 1 to 8, which is at least electrically connected to the control unit (4).