ELECTRIC MOTOR FOR A MOTOR VEHICLE

Description

[0001] The invention relates to an electric motor of a motor vehicle.

[0002] Motor vehicles feature a variety of adjustment mechanisms, each comprising an electric motor that moves an adjustment component. To simplify steering, an electric steering system, such as power steering, is used. In this system, an electric motor (steering motor) typically engages a rotating steering linkage, which moves a rack and pinion transversely. The rack and pinion are then connected to the vehicle's wheels, which are moved during steering. Alternatively, the electric motor can act directly on the rack and move it transversely. With appropriate control, the electric motor also prevents unintended steering inputs, such as when driving over a pothole, by monitoring the steering wheel's angular movement.

[0003] The electric motor is usually a brushless direct current (BLDC) motor and has several electrical coils that are energized by electronics. If an individual electrical coil short-circuits, for example due to accidental contact with a conductive object, the electric motor can become blocked, making steering the vehicle impossible or at least difficult. To protect against this, the individual components are usually housed in a common, relatively robust casing. This casing is typically made of metal.

[0004] However, with relatively large manufacturing tolerances, it is possible that individual components, such as the electrical coils, may come into electrical contact with the housing, or that an arc may form between them. This also impairs the functionality of the electric motor, such as causing it to jam. To prevent this, the individual components are usually spaced relatively far from the inner walls of the housing, thus creating an air gap between them. Consequently, the space required is increased.

[0005] It is also necessary to protect the individual components of the electronics from particles that could impair their functionality. For example, such particles can cause short circuits between conductor tracks on a circuit board. To prevent this, all components of the electric motor, especially the electrical coils, are typically cleaned in a relatively complex process before assembly, which increases manufacturing costs. Alternatively, or in combination with this, the electronics are overmolded with a plastic coating, which also leads to increased manufacturing costs. This method also makes heat dissipation from the electronics more difficult.

[0006] In US 2012 / 104878 A1, a pump motor assembly is disclosed that can supply driving force to a liquid pump. The pump motor assembly comprises a rotor, a stator, a housing that accommodates the rotor and stator, and a control assembly attached to the housing that can control the motor operation. The control assembly includes a filler plate located beneath a window section to prevent an air gap along its underside, thus ensuring visibility of the display while reducing the risk of condensation.

[0007] From US patent 10,340,767 B2, a motor is known comprising a rotor with a shaft, a stator arranged radially outside the rotor, a bearing arranged on a top surface of the stator, a tubular housing, a bearing holder arranged on a top surface of the stator, and a busbar assembly arranged on a top surface of the bearing holder. The housing may have an inner circumferential surface arranged to hold the stator.

[0008] The invention is based on the objective of providing a particularly suitable electric motor for a motor vehicle, whereby in particular manufacturing costs are reduced and preferably quality is increased.

[0009] According to the invention, this problem is solved by the features of claim 1. Advantageous further developments and embodiments are the subject of the dependent claims.

[0010] The electric motor is a component of a motor vehicle. It is suitable, specifically designed and configured for this purpose. The motor vehicle is preferably land-based and has, in particular, one or more wheels by means of which it makes contact with a road surface. Specifically, it is possible to position the motor vehicle essentially anywhere on the road surface. In other words, the motor vehicle is not rail-guided. The motor vehicle is, for example, a commercial vehicle such as a truck or bus. However, it is particularly preferred that the motor vehicle be a passenger car.

[0011] The electric motor is preferably a synchronous machine. The electric motor is, for example, a brushed commutator motor. However, it is particularly preferred that the electric motor be brushless and preferably a brushless DC motor (BLDC). Preferably, the electric motor is a component of an auxiliary unit, such as a variable displacement drive. The variable displacement drive comprises an adjustment element that is moved along an adjustment path by means of the electric motor during operation.

[0012] In a preferred embodiment of the invention, the adjustment drive is a power steering system, and the adjustment element is, in particular, either a steering linkage through which a rack is driven, or the rack itself, wherein at least one of the vehicle's wheels is pivoted about a substantially vertical axis by means of the rack. In other words, the electric motor is a steering motor. The steering motor assists, for example, a steering movement initiated by the driver of the vehicle. Alternatively, the steering movement is initiated by the steering motor itself, for example, in response to a signal generated by driver assistance systems and / or in response to steering wheel operation, wherein the steering wheel is, for example, only connected to the other components of the steering system, such as the steering linkage or the rack, via a signal connection, but not mechanically.

[0013] Alternatively, the electric motor could be a component of an electric window regulator, an electric seat adjustment mechanism, an electric tailgate, or an electric sunroof. Another alternative would be a component of a vehicle seat massage system. Yet another alternative would be the auxiliary unit a pump, such as a lubrication pump, particularly a transmission or engine oil pump. Another alternative would be the actuator a water pump, an air conditioning compressor, or a blower unit, such as a radiator fan or a heating / ventilation (HVAC) blower.

[0014] The electric motor has a housing comprising a motor compartment and an electronics compartment, also referred to as the motor section and electronics section, respectively. The two compartments / sections are separated by a housing wall, which is also an integral part of the housing. The housing is hollow cylindrical, and the housing wall is oriented essentially perpendicular to the axis of the hollow cylinder. Consequently, both compartments (sections) are cup-shaped. The housing is a single piece, which simplifies manufacturing. Advantageously, the housing is made of a metal such as steel or aluminum, for example, pure aluminum or an aluminum alloy. This avoids excessive weight while ensuring robustness. Preferably, the housing is manufactured by cold extrusion or die casting.

[0015] A stator is arranged in the motor compartment. The stator advantageously comprises several electrical coils. Advantageously, the stator has one or more elements by which the individual electrical coils are stabilized relative to each other, for example, a laminated core. In particular, the electrical coils are divided into several (electrical) phases, for example, two phases or three phases, with each electrical phase having the same number of electrical coils. The electrical phases, in turn, are connected, for example, in a delta or a star connection. This connection is effected, in particular, by means of a connection ring of the stator, which in particular forms an end face of the stator. Alternatively, the electrical coils are connected independently of the stator.

[0016] Preferably, the electric motor also includes a rotor which is set into rotation by the stator during operation. The rotor expediently comprises one or more permanent magnets. In particular, the stator surrounds the rotor circumferentially, so that the electric motor is designed as an internal rotor motor. The rotor is also preferably arranged in the motor compartment and attached to a motor shaft.

[0017] The electronics compartment contains electronic components, such as one or more printed circuit boards. These components supply current to the stator, particularly to the electrical coils, and are suitably designed and configured for this purpose. Specifically, the electronic components include one or more semiconductor switches, such as power semiconductor switches, for example, field-effect transistors (FOTs), MOSFETs, IGBTs, or GTOs. These semiconductor switches are advantageously connected electrically to form a bridge circuit, preferably adapted to the number of phases of the stator. In particular, a so-called B6 circuit is implemented.

[0018] The electronics are electrically contacted with the stator by means of a number of phase terminals. The number of phase terminals is expediently adapted to the number of phases of the electric motor, and is, for example, equal to the number of phases, particularly if the phases are connected in a delta configuration. If the electrical phases are connected in a star configuration, the number of phase terminals is appropriately equal to the number of phases plus one (1).

[0019] The housing wall has several openings, the number of which is expediently equal to the number of phase connections. The phase connections protrude through the openings, with each opening being assigned one phase connection. The phase connections are expediently spaced from the edge of their respective openings to prevent an electrical short circuit. Preferably, the distance between the phase connections and the edge of the openings is greater than 3 mm, 5 mm, or 1 cm. This also prevents the formation of an arc between them. Furthermore, no additional element is required for the electrical insulation of the two.

[0020] The phase terminals are made of a metal, for example, and are preferably strip-shaped. In particular, the phase terminals are made of sheet metal, preferably copper strips. Advantageously, the phase terminals are attached to the stator so that, during assembly, the phase terminals are guided through the openings when the stator is inserted into the motor compartment. Suitablely, the phase terminals are integrally formed with a component of the stator, such as at least one of the electrical coils or a connecting ring that serves to connect the individual electrical coils to the phases or to the delta / star connection. In the assembled state, the phase terminals are electrically connected to the electronics, in particular to the bridge circuit.Advantageously, the phase connections are each designed as knife contacts and engage with corresponding counter-contacts of the electronics, which facilitates assembly.

[0021] The electric motor further comprises a separating element located between the stator and the electronics. Specifically, the separating element is arranged parallel to the housing wall. The openings and the housing wall are at least partially covered by the separating element. Consequently, an additional component is present between the stator and the electronics, and the separating element reduces the size of the openings. As a result, the passage of particles between the motor compartment and the electronics compartment is impeded. These particles could arise, for example, from abrasion of components of the electric motor located in the motor compartment or be present there after manufacturing.

[0022] In summary, even with the presence of (critical) particles, particle exchange between the two compartments is avoided or at least highly unlikely. Thanks to the separating element, it is therefore unnecessary to thoroughly clean the individual components of the stator and other parts of the electric motor located in the motor compartment. This eliminates a manufacturing step and thus reduces production costs. Furthermore, these components can exhibit higher residual contamination requirements. It is also possible to use comparatively large manufacturing tolerances for the housing and phase connections. It is only necessary that these components are spaced apart from each other in the assembled state. The reduction of the openings between the motor compartment and the electronics compartment is achieved by means of the separating element, with the corresponding adjustment being made only at this point. This further reduces production costs.Furthermore, since only the openings are covered and the separating element is not located within the openings, it is possible to choose comparatively large manufacturing tolerances for both.

[0023] Furthermore, the separating element can be designed to be air-permeable or at least semi-permeable, ensuring reliable ventilation of the electric motor components located in the motor compartment. Since only a single separating element is required, assembly is simplified, eliminating the need to adapt individual elements to specific openings. This reduces manufacturing costs. Additionally, because the housing wall is at least partially covered by the separating element, direct mechanical contact between the electronics or stator and the housing wall is prevented, thus avoiding damage.

[0024] For example, the cross-section of the housing is essentially round, and the housing wall is also circular. Advantageously, in this case, the separating element is also round / circular. Here, for example, the outer diameter of the separating element is larger than the inner diameter of the housing, and the separating element thus has a bent edge. Consequently, sealing is improved. Particularly preferably, however, the outer diameter of the separating element is (slightly) smaller than the inner diameter of the housing. This facilitates assembly. For example, the edge of the separating element has notches or other features. This makes gripping the separating element easier and therefore facilitates assembly. Furthermore, tangential alignment is achieved in this way. Particularly preferably, however, the outer contour of the separating element is smooth. This simplifies manufacturing.

[0025] In particular, the housing wall has a mounting bracket for a bearing, so that the housing wall functions as a B-side bearing shield. Advantageously, the housing wall includes a ring by means of which the bearing is received. This simplifies assembly. The motor shaft is preferably supported by the bearing. For example, the motor shaft terminates at the bearing. However, it is particularly preferred that the motor shaft is guided through the housing wall by means of the bearing, so that its end is at least partially located in the electronics compartment. Preferably, the electronics include a speed sensor that interacts with this end of the motor shaft. This enables control of the stator depending on the detected speed of the motor shaft, without requiring complex wiring.The separating element is suitably designed in a ring shape, with its inner diameter being expediently slightly larger than the outer diameter of the ring. This also provides tolerance compensation, which simplifies assembly.

[0026] For example, the separating element is arranged between the housing wall and the electronics. However, it is particularly preferred that the separating element is arranged between the housing wall and the stator. This prevents the stator from directly contacting the housing wall. Furthermore, when the phase connections are inserted through the separating element into the openings, a gap between the separating element and the housing wall is prevented if the phase connections are attached to the stator. Consequently, robustness is increased and assembly is simplified.

[0027] The separating element is film-like and therefore has a thickness of less than 0.5 mm or 0.1 mm. This means that the space requirement and weight are essentially unchanged. Preferably, the separating element is designed to be flexible. This allows for tolerance compensation by deforming the separating element, particularly elastically. Due to its flexibility, the force required for this deformation is comparatively low.

[0028] For example, during assembly, an intact separating element is used, and this is pierced by the phase connections, resulting in a number of main slots corresponding to the number of phase connections, with one phase connection protruding through each main slot. This reduces the effort required to manufacture the separating element. Furthermore, this method eliminates the need to precisely match the individual components, allowing for comparatively large manufacturing tolerances. Alternatively, the separating element can be pre-perforated, with the phase connections opening them upon insertion. This ensures that the main slot is always precisely sized to match the phase connections used, and the separating element can be used for a wide variety of electric motors.Alternatively, a number of main slots corresponding to the number of phase connections are incorporated into the separating element before the phase connections are made. At a minimum, however, the separating element always has a number of main slots corresponding to the number of phase connections, with one phase connection protruding through each main slot. Thus, the size of the main slots is essentially always adapted to the phase connections, reliably preventing the passage of particles through the openings by means of the separating element. The main slots are always closed around their circumference, making them relatively stable. This also covers a relatively large portion of the openings in the separating element, resulting in a relatively stable design for the separating element. Alternatively, the separating element is recessed along its edges up to the openings, simplifying assembly.

[0029] For example, the main slots are always adapted to the cross-section of the phase connections and / or are essentially straight. Particularly preferably, each main slot has a further slot opening into it, which is at least partially not parallel to the main slot and forms an angle with it, for example, between 10° and 90°. The phase connections do not protrude through this further slot; instead, it serves as a tolerance compensation, thus preventing uncontrolled tearing of the respective main slot. Consequently, scrap is reduced. The further slot opens into the main slot, for example, at its end or in the middle. In particular, each main slot has two further such slots assigned to it, which are suitably located on different longitudinal sides of the respective main slot. In another alternative, more than two further such slots are present.

[0030] Preferably, the separating element is attached to the housing wall. This eliminates the need to attach the separating element to the stator or the electronics, which can then be manufactured separately. Fasteners such as clips are used for this purpose. However, it is particularly preferred that the separating element has an adhesive layer that adheres to the housing wall.

[0031] In other words, the fastening is achieved using the adhesive layer. Consequently, the effort required is reduced.

[0032] Preferably, the separating element has at least one electrically insulating layer. This insulating layer prevents a short circuit, particularly a ground fault, with the housing wall. Advantageously, the separating element is arranged between the housing wall and the stator. If an adhesive layer is present, it is advantageously positioned between the electrically insulating layer and the housing wall. The electrically insulating layer is preferably made of polyester. Preferably, the separating element is film-like, so that the electrically insulating layer is made of a polyester film. This reduces manufacturing costs.

[0033] The separating element ideally incorporates a layer that provides electrical shielding. This layer shields against electromagnetic waves. For this purpose, the electrical layer is advantageously grounded and, for example, connected to the housing wall. This increases electromagnetic compatibility, eliminating the need to modify the electronics. Consequently, relatively inexpensive components can be used. Alternatively, or in combination, the layer provides magnetic shielding. In this case, the layer exhibits paramagnetic or diamagnetic properties. This prevents or at least reduces the propagation of magnetic fields generated by the stator into the electronics, thus eliminating the need to shield the individual electronic components.In this way, comparatively inexpensive components can be used. To provide the desired shielding effect, for example, a component of the separating element is metallized and / or coated to create the layer. Alternatively, the layer is made of a plastic or similar material in which particles are embedded, providing the desired effect.

[0034] The invention is explained in more detail below with reference to a drawing. The drawing shows: Fig. 1 an electric steering system of a motor vehicle, with an electric motor, Fig. 2 partial exploded view of the electric motor having a separating element, Figs. 3, 4 each longitudinal section of the electric motor, Fig. 5 longitudinal section of the separating element, Fig. 6 partial alternative embodiment of the separating element, and Figs. 7-9 partial further alternatives.

[0035] Corresponding parts are marked with the same reference symbols in all figures.

[0036] In Fig. 1 The diagram schematically simplifies the representation of an adjustment drive 2 of a motor vehicle 4 in the form of an electric power steering system. The motor vehicle 4 comprises a steering wheel 6, which is coupled to a rack 10 via a pinion 12 by means of a steering rod 8. The rack 10 is coupled to two front wheels 14, which are to be pivoted about a substantially vertical axis 16 when the steering wheel 6 is turned. The steering rod 8 is divided into two parts, the two parts being connected to each other by means of a rod 18. A first sensor 20 is assigned to the part of the steering rod 8 located between the rod 18 and the steering wheel 6, and a second sensor 22 is assigned to the part of the steering rod 8 located between the pinion 12 and the rod 18. These sensors are connected to a control unit 24 via signal transmission.

[0037] The section of the steering rod 8 located between the pinion 12 and the rod 18 is further equipped with an electric motor 26, which is controlled by the control unit 24 and is designed as a brushless DC motor (BLDC). The angular offset between the two sections of the steering rod 8 is detected by the two sensors 20 and 22, thus determining the desired steering angle of the front wheels 14. If this angle is reached, the electric motor 26 is energized to assist the rotational movement of the steering rod 8.

[0038] In Figure 2 The electric motor 26 is shown in a partial exploded view, with the individual components pulled apart along a longitudinal axis 28. Figure 3 The electric motor 26 is shown in a longitudinal section along the longitudinal axis 28 in a partially extended state and in Figure 4The electric motor 26 is shown in a longitudinal section along the longitudinal axis 28 in its assembled state. The motor 26 has a housing 30 made of aluminum using a cold-forming process. The housing 30 is essentially hollow cylindrical with a round base, the cylinder axis coinciding with the longitudinal axis 28. The housing has a housing wall 32 arranged perpendicular to the longitudinal axis 28, which is integrally formed with and located within the hollow cylinder. The housing wall 32 is positioned between the two ends of the hollow cylinder, forming a motor compartment 34 and an electronics compartment 36, which are separated from each other by the housing wall 32.

[0039] The housing wall 32 has three openings 38 with a circular cross-section, which connect the motor compartment 34 and the electronics compartment 36. The openings 38 are offset away from the longitudinal axis 28, and a recess 40 is provided in the housing wall 32 at its center with respect to the longitudinal axis 28. This recess is bounded by a ring 42. The ring 42 is a hollow cylindrical section arranged concentrically to the longitudinal axis 28 and bounds the recess 40 at its radially outer end.

[0040] The electric motor 26 further comprises a stator 44, which includes several electrical coils 46 connected to a total of three phases by means of a connecting ring 48. The connecting ring 48 connects the electrical phases in a delta configuration. The electrical coils 46 are each mounted on a laminated core, which is assembled into a circular structure 50 and stabilized relative to each other. The axis of each of the electrical coils 46 is arranged on a radial line with respect to the longitudinal axis 28.

[0041] The interconnection ring 48 forms one of the end faces of the stator 44, and three phase terminals 52 are electrically contacted and attached to it. The phase terminals 52 run parallel to the longitudinal axis 28 and are offset from each other by 120° with respect to the longitudinal axis 28. Each of the phase terminals 52 has a copper strip 54, which is stabilized by a plastic holder 56. The holder 56 is integrally formed with a corresponding plastic part of the interconnection ring 48. Each copper strip 54 is electrically contacted by an associated electrical conductor of the interconnection ring 48, which is used for the electrical contacting of the electrical coils 46. In the assembled state, each phase terminal 52, namely the respective copper strip 54, projects through an associated opening 38 into the electronics compartment 36.

[0042] A rotor 58, comprising a laminated core and several permanent magnets attached to it, is surrounded by the stator 44. The rotor 58 is attached to a motor shaft 60, which is arranged along the longitudinal axis 28. The motor shaft 60, the rotor 58, and the stator 44 are arranged concentrically to the longitudinal axis 28. The motor shaft 28 is rotatably mounted about the longitudinal axis 28 by means of a B-side bearing 62 and an A-side bearing 64. The B-side bearing 62 is guided on the housing wall 32 and is therefore a floating bearing. For this purpose, the B-side bearing 62 is inserted into the ring 42. The motor shaft 60 projects through the housing wall 32 into the electronics compartment 36. The A-side bearing 64 is attached to an A-side bearing plate 66, which closes the motor compartment 34 on the side opposite the housing wall 32. The A-side bearing shield 66 is placed on the edge of the housing 30 and fastened there.

[0043] Electronic compartment 36 contains an electronics unit 70, which is located in Figure 4 The electronics 70, which are not shown in detail, comprise a printed circuit board 72 on which several semiconductor switches 74 are arranged, two of which are shown. The semiconductor switches 74 are interconnected in a B6 circuit, and the semiconductor switches 74 are controlled by further electrical / electronic components, which are also attached to the printed circuit board 72. In the assembled state, the phase terminals 52 are electrically connected to the electronics 70, so that the electrical coils 46 can be energized by the electronics 70. Consequently, the electronics 70 serves to energize the electrical coils 46. In other words, the stator 44 and the electronics 70 are electrically connected to each other via the phase terminals 52.

[0044] A separating element 76 is arranged between the electronics 70 and the stator 44, and is positioned perpendicular to the longitudinal axis 28. The separating element 76 is located in the motor compartment 34 and is thus positioned between the housing wall 32 and the stator 44. The separating element 76 is made of a film and is therefore film-like and adhered to the housing wall 32. For this purpose, the separating element 76 has, as shown in Figure 5In a cross-sectional view along the longitudinal axis 28, an adhesive layer 78 is shown, which adheres to the housing wall 32. Two layers 80 are applied to the adhesive layer 78 and stacked on top of each other. One of the layers 80 has an electrically shielding effect. For this purpose, this layer 80 is made of an electrically conductive material and is electrically connected to ground. The other layer 80 has a magnetically shielding effect and is made of a plastic in which diamagnetic particles are incorporated. In a variant not shown in detail, the two layers 80 are not present.

[0045] However, the separating element 76 always includes an electrically insulating layer 82, which is made of a polyester film. If the two layers 80 are not present, then only the insulating layer 82, i.e., the polyester film, and the adhesive layer 78 are present.

[0046] The thickness of the separating element 76 is less than 0.1 mm, and the separating element 76 is flexible. The separating element 76 has an annular cross-section, with its outer diameter being slightly smaller than the inner diameter of the motor compartment 34, i.e., the housing 32, and its inner diameter being slightly larger than the outer diameter of the ring 42. Several indentations 83 are provided in the circumference of the separating element 76, which are engaged by projections of the housing wall 32 (not shown). This provides anti-rotation protection.

[0047] In the assembled state, the openings 38 and the housing wall 32 are covered by the separating element 76, and the phase connections 52 thus protrude through the separating element 76. For this purpose, the separating element 76 has three main slots 84, which are cut or punched into the separating element 26. Each of the main slots 84 extends essentially radially with respect to the longitudinal axis 28, and each of the main slots 84 is associated with one of the phase connections 52. Thus, one of the phase connections 52 protrudes through each of the main slots 84. Two further slots 86 open into each of the main slots 84. The two further slots 86 are arranged at opposite ends of the main slot 84 and run obliquely to it, i.e., not parallel. Consequently, a Z-shape is realized by means of each of the main slots 84 and the associated further slots 86.

[0048] Due to the insulating layer 82, a short circuit to ground is prevented even when the stator 44 approaches the housing wall 32, thus preventing a short circuit of the stator 44 across the housing wall 32. This increases the safety of the electric motor 26. Furthermore, since the openings 38 are partially covered by the separating element 76, the passage of particles from the motor compartment 34 into the electronics compartment 36 in the area of ​​the phase connections 52 is prevented or at least made more difficult. Therefore, comparatively inexpensive electronics 70 can be used. The flexible separating element 76 also compensates for tolerances. To prevent the passage of particles, it is only necessary to at least partially cover the openings 38 with the separating element 76.Provided the openings 38 are chosen to be relatively large, it is possible to use comparatively large manufacturing tolerances for both the housing 30 and the phase terminals 52 and the stator 44, while still preventing particle passage. Furthermore, the enlarged openings 38 prevent an electrical short circuit between the phase terminals 52 and the housing wall 32 via the air gap thus formed. In addition, the at least partial air permeability through the separating element 76, at least in the area of ​​the main slots 84, allows air to pass through, thus enabling ventilation of the motor compartment 34.

[0049] In Figure 6A modified version of the separating element 76 is shown in section. In this version, the main slot 84, of which there are three, continues to run radially. The two additional slots 86 are located on opposite longitudinal sides of the main slot 84 and run perpendicular to it. Thus, even if the phase connections 52 are not aligned with the main slot 84 before insertion, passage through the separating element 76 is possible without it tearing uncontrollably. In other variants, not shown in detail, the notches 83 are not present. No other modifications are expediently made in these cases.

[0050] In Figure 7A further alternative is shown in part. Four additional slots 86 are now assigned to the main slot 84 shown, with two of them located on the same side with respect to the main slot 84. The additional slots 86 are arranged perpendicular to the main slot 84.

[0051] In Figure 8 is a variation of the one in Figure 7 The variant shown is illustrated. The four additional slots 86 are again present, but these are inclined at 45° relative to the main slot 84. Thus, a fishing tackle pattern is realized.

[0052] In Figure 9 Another alternative is shown. Each of the sides of the main slot 84 is assigned four further slots 86, so that there are a total of eight such further slots 86.

Claims

1. Electric motor (26) for a motor vehicle (4), in particular steering motor, having a housing (30) comprising a motor compartment (34) and an electronics compartment (36) which are separated by means of a housing wall (32) having a plurality of openings (38), wherein the housing (30) is in one piece, wherein the housing (30) is of hollow-cylindrical design, wherein the housing wall (32) is arranged perpendicularly with respect to the axis of the hollow cylinder, wherein a stator (44) is arranged in the motor compartment (34) and an electronics system (70) is arranged in the electronics compartment (36), which are electrically contacted to each other by means of phase connections (52) which protrude through the openings (38), wherein a separating element (76) is arranged between the stator (44) and the electronics system (70), by means of which separating element the openings (38) and the housing wall (32) are at least partially covered, wherein the separating element (76) is film-like.

2. Electric motor (26) according to Claim 1, characterized in that the separating element (76) is arranged between the housing wall (32) and the stator.

3. Electric motor (26) according to Claim 1 or 2, characterized in that the separating element (76) has a number of main slots (84) corresponding to the number of phase connections (52), wherein one of the phase connections (52) extends through each of the main slots (84).

4. Electric motor (26) according to Claim 3, characterized in that at least one further slot (86) which does not run parallel to the main slot (84) opens into each of the main slots (84).

5. Electric motor (76) according to one of Claims 1 to 4, characterized in that the separating element (76) has an adhesive layer (78) which adheres to the housing wall (32).

6. Electric motor (26) according to one of Claims 1 to 5, characterized in that the separating element (76) has at least one electrically insulating layer (82).

7. Electric motor (26) according to one of Claims 1 to 6, characterized in that the separating element (76) has a layer (80) which has an electrically and / or magnetically shielding effect.