Electric motor particularly configured to equip a pump

Abstract

Title: Electric motor in particular configured to equip a pump The subject of the invention is an electric motor (1), in particular configured to equip a pump, in particular a pump configured to circulate a heat transfer fluid, the electric motor comprising: a housing, a stator (3) and a rotor housed in the housing, the rotor having an axis of rotation (Z), control electronics (7) configured to control the stator (3) and the rotor, the control electronics (7) comprising at least one peripheral electronic component (8), in particular a capacitor or an electromagnetic protection filter coil, this peripheral electronic component (8) being housed at least partially in a cavity of the housing (2) located on the periphery of the stator (3). Figure for the abstract: Fig. 2

Description

Title of the invention: Electric motor particularly configured to equip a pump

[0001] The present invention relates in particular to an electric motor, in particular configured to equip a pump.

[0002] Patent application US20210079920Al describes an electric coolant pump, for example intended to be used as an additional water pump in a vehicle. An electronic card is housed in the housing of this pump, between the stator / rotor assembly and the pumping chamber. All electronic components are mounted on an electronic card of the printed circuit board type. Larger components, for example a capacitor, create additional space (in the direction of the height of the engine) which can be problematic.

[0003] The invention aims in particular to remedy this problem.

[0004] The invention thus relates to an electric motor, in particular configured to equip a pump, in particular a pump configured to circulate a heat transfer fluid, the electric motor comprising: - a housing, - a stator and a rotor housed in the housing, the rotor having an axis of rotation, - control electronics configured to control the stator and the rotor, the control electronics comprising at least one peripheral electronic component, in particular a capacitor or an electromagnetic protection filtering coil, this peripheral electronic component being housed at least partially in a cavity of the housing located on the periphery of the stator.

[0005] The term "located on the periphery of the stator" means that the cavity of the housing and the peripheral electronic component housed therein are radially outside the circumference of the stator, so that this electronic component does not increase the size in the direction of the axis (Z) of rotation of the rotor. In other words, the fact that the peripheral electronic component, which may be relatively bulky along the axis of rotation (or the Z axis), is on the periphery of the stator, the dimension along the (Z) axis of this component does not add to the dimension along the (Z) axis of the stator / rotor. The invention thus proposes to place the capacitor, for example, laterally, beyond the periphery of the stator. This adds radial size (in the direction of the stator / rotor radius), size which is generally more easily manageable than size along the (Z) axis.

[0006] According to one aspect of the invention, the control electronics comprises an electronic card, in particular a printed circuit card (PCB type in English for Printed Circuit Board), and the peripheral electronic component is mechanically assembled with this electronic card.

[0007] According to one aspect of the invention, the peripheral electronic component is offset relative to the electronic card.

[0008] According to one aspect of the invention, the peripheral electronic component comprises connection tabs soldered onto the electronic card.

[0009] According to one aspect of the invention, the connection tabs of the peripheral electronic component are curved, in particular having a generally U-shaped shape. Thus, the peripheral electronic component is mounted on the electronic card by its U-shaped connection tabs, while being offset relative to the electronic card (the U-shape of the tabs allows the connection while allowing the offset). The shape of the tabs allows, for example, the capacitor to be placed on the side of the electronic card.

[0010] According to one aspect of the invention, the peripheral electronic component is placed relative to the electronic card so that a geometric plane of the electronic card intersects the peripheral electronic component, along its height.

[0011] Alternatively, the peripheral electronic component is positioned relative to the electronic card such that the peripheral electronic component extends on only one side of a geometric plane of the electronic card.

[0012] According to another aspect of the invention, the peripheral electronic component is mounted on an extension of the electronic card, this extension of the electronic card, in particular in the form of an ear forming part of the electronic card, being located outside the periphery of the stator.

[0013] According to one aspect of the invention, this extension of the electronic card has a location and a shape allowing the peripheral electronic component to be located on the outer periphery of the stator.

[0014] According to one aspect of the invention, the peripheral electronic component is mounted on the electronic card, opposite the extension, the peripheral electronic component extending on one side thereof.

[0015] According to one aspect of the invention, the extension has in particular a surface area at least 5 times, in particular at least 10 times, smaller than the surface area of ​​the rest of the electronic card.

[0016] According to one aspect of the invention, the cavity which receives the peripheral electronic component has a substantially cylindrical shape with an axis parallel to the axis of rotation of the motor.

[0017] According to one aspect of the invention, the housing comprises at least two cavities, in particular distant from each other, to each receive one of the peripheral electronic components.

[0018] According to one aspect of the invention, the housing comprises as many cavities as there are peripheral electronic components, in particular capacitors, to be housed.

[0019] According to one aspect of the invention, the electronic card is provided with a plurality of peripheral electronic components.

[0020] According to one aspect of the invention, the number of peripheral electronic components may be 1, 2, 3 or 4 for example.

[0021] According to one aspect of the invention, the housing is made in one piece, for example from plastic.

[0022] According to one aspect of the invention, the pre-assembled electronic card is inserted into the housing.

[0023] According to one aspect of the invention, the motor comprises a cover configured to close the housing, once the electronic card is inserted into the housing.

[0024] According to one aspect of the invention, the housing comprises a side connector to allow the motor to be connected to an external electrical circuit.

[0025] The connector can take other configurations.

[0026] According to one aspect of the invention, the electronic card comprises electronic components, in particular of smaller dimensions than the peripheral electronic component(s), and placed opposite the inside of the periphery of the stator.

[0027] According to one aspect of the invention, the cavity of the housing receives a paste, in particular of the silicone type, around the peripheral electronic component to protect it from vibrations.

[0028] According to one aspect of the invention, the peripheral electronic component is fitted through an opening in the electronic card.

[0029] The invention also relates to a pump, in particular a water pump, comprising an electric motor as mentioned above.

[0030] According to one aspect of the invention, the electronic card is configured to be placed on the side of a volute of the pump. In this case, the electronic card is for example inserted between the stator / rotor assembly and a volute of the pump.

[0031] Alternatively, the electronic card is configured to be placed on an external side of the pump, opposite the volute.

[0032] The pump may comprise a rotating wheel driven by the rotor.

[0033] Other characteristics, details and advantages of the invention will emerge more clearly on reading the description which follows on the one hand, and several exemplary embodiments given for informational and non-limiting purposes with reference to the appended schematic drawings on the other hand, in which:

[0034] [Fig. 1] [Fig. 1] is a perspective representation of an electric motor according to an example of an embodiment of the invention;

[0035] [Fig.2] [Fig.2] illustrates the control electronics of the engine of [Fig.l], the housing being ignored in this figure;

[0036] [Fig.3] [Fig.3] is a perspective representation of the motor housing of the figures 1 and 2;

[0037] [Fig.4] [Fig.4] is a perspective representation of an engine according to another embodiment of the invention;

[0038] [Fig.5] [Fig.5] is a perspective representation of an electric motor according to yet another example of an embodiment of the invention;

[0039] [Fig.6] [Fig.6] is a representation of the engine control electronics of the [Fig.5].

[0040] The features, variants and different embodiments of the invention may be combined with each other, in various combinations, provided that they are not incompatible or mutually exclusive. In particular, variants of the invention may be imagined comprising only a selection of features described below in isolation from the other features described, if this selection of features is sufficient to confer a technical advantage and / or to differentiate the invention from the prior art.

[0041] Figures 1 to 3 show an electric motor 1 according to an exemplary implementation of the invention, configured to equip a pump, here a pump for circulating a heat transfer fluid in a thermal management system of a motor vehicle. This heat transfer fluid is, for example, water-based.

[0042] The electric motor 1 comprises: - a box 2, - a stator 3 and a rotor 4 housed in the housing 2, the rotor 4 being provided with a rotating output shaft 5 which has an axis of rotation Z, the stator 3 surrounding the rotor 4, - control electronics 7 configured to control the stator 3 and the rotor 4, the control electronics 7 comprising peripheral electronic components, here two capacitors 8, these peripheral electronic components 8 each being housed in a cavity 9 of the housing 2 located on the periphery of the stator 3.

[0043] The peripheral electronic components may comprise, instead of a capacitor 8, or in addition to the capacitors 8, one or more electromagnetic protection filtering coils.

[0044] The cavities 9 are formed by cylindrical walls 10, which extend along the Z axis, of the housing 2.

[0045] The term "located on the periphery of the stator" means that the cavity 9 of the housing 2 and the peripheral electronic component (capacitor 8) housed therein are radially outside the circumference of the stator 3, so that this electronic component does not increase the size in the direction of the axis Z of rotation of the rotor 4. In other words, the fact that the peripheral electronic component 8, which may be relatively bulky along the axis of rotation Z (i.e. the component has a relatively large height), is on the periphery of the stator 3, the dimension along the axis Z of this component does not accumulate with the dimension along the axis Z of the stator / rotor. The invention thus proposes to place the capacitor 8, for example, laterally, beyond the periphery Pext of the stator 3 (i.e. the outer cylindrical geometric envelope of the stator).This adds radial bulk (in the direction of the stator / rotor radius), bulk which is generally more easily manageable than bulk along the Z axis.

[0046] The control electronics 7 comprises an electronic printed circuit board 12 (PCB type in English), and the peripheral electronic components 8 are mechanically assembled with this electronic board 12.

[0047] In the example described, each peripheral electronic component 8 is offset relative to the electronic card 12. Thus the peripheral electronic components 8 are not positioned above (along the Z axis) the electronic card 12, but are eccentric relative to this electronic card 12.

[0048] Each peripheral electronic component 8 comprises connection pins 14 soldered onto the electronic card 12.

[0049] The connection tabs 14 of the peripheral electronic component 8 are curved, having a generally U-shaped shape. Thus, the peripheral electronic component 8 is mounted on the electronic card 12 by its U-shaped connection tabs, while being offset relative to the electronic card 12 (the U-shape of the tabs 14 allows the connection while allowing the offset). The shape of the tabs 14 here allows the capacitor to be placed on the side of the electronic card 12.

[0050] The peripheral electronic component 8 is placed relative to the electronic card 12 so that the peripheral electronic component 8 extends on only one side of a geometric plane PG of the electronic card 12.

[0051] The electronic card 12 has holes 16 for connecting electrical connection pins 17 to it.

[0052] In another embodiment of the invention illustrated in [Fig. 4], the peripheral electronic components 8 are each mounted on an extension 20 of the electronic card 12, this extension 20 of the electronic card 12, in the form of an ear forming part of the electronic card 12, being located outside the periphery of the stator 3.

[0053] This extension 20 of the electronic card 12 has a location and a shape allowing the peripheral electronic component 8 to be placed on the outer periphery Pext of the stator 3.

[0054] The peripheral electronic component 8 is mounted on the electronic card 12, opposite the extension 20, the peripheral electronic component 8 extending on one side of the extension 20.

[0055] The extension 20 has a surface area at least 5 times, in particular at least 10 times, smaller than the surface area of ​​the rest of the electronic card 12. The extension 20 may have various shapes, for example substantially rectangular as in [Fig.4], or alternatively, be triangular, trapezoidal, or rounded. The extensions 20 are in the geometric plane PG of the electronic card 12.

[0056] In the examples described, the housing 2 comprises two cavities 9, distant from each other, each to receive one of the peripheral electronic components 8.

[0057] Generally, the housing 2 comprises as many cavities 9 as there are peripheral electronic components 8 to be housed. The number of cavities may be 3, 4 or more when the number of peripheral electronic components to be housed is respectively 3, 4 or more.

[0058] The housing 2 is made in one piece, for example from plastic, and comprises a housing 25, of overall annular shape, configured to house the stator 3.

[0059] The housing 2 further comprises a central perforated pot 26 configured to receive the rotor 4.

[0060] The pre-assembled electronic card 12 is inserted into the housing 2.

[0061] The motor comprises a cover 22, generally flat, configured to close the housing 2, once the electronic card 12 is inserted into the housing 2.

[0062] The housing 2 includes a side connector 27 to allow the motor to be connected to an external electrical circuit.

[0063] The electronic card 12 may comprise electronic components, of smaller dimensions than the peripheral electronic components 8, and placed opposite the inside of the periphery of the stator 3.

[0064] Each cavity 9 of the housing 2 receives a paste, in particular of the silicone type, around the peripheral electronic component 8 to protect it from vibrations.

[0065] In a non-illustrated variant of the invention, the peripheral electronic component 8 is fitted through an opening in the electronic card 12.

[0066] In the examples which have just been described, the electronic card 12 is configured to be placed on an external side Cext of the pump, axially (along the axis Z) opposite a volute 30 in which the fluid circulates.

[0067] In another exemplary embodiment of the invention illustrated in FIGS. 5 and 6, the electronic card 12 is configured to be placed on the Cvol side of a volute 30 of the pump 100. In this case, the electronic card 12 is for example inserted between the stator / rotor assembly and the volute 30 of the pump 100.

Claims

Claims

1. Electric motor (1), in particular configured to equip a pump (100), in particular a pump configured to circulate a heat transfer fluid, the electric motor comprising: - a housing (2), - a stator (3) and a rotor (4) housed in the housing (2), the rotor (4) having an axis of rotation (Z), - control electronics (7) configured to control the stator (3) and the rotor (4), the control electronics (7) comprising at least one peripheral electronic component (8), in particular a capacitor or an electromagnetic protection filter coil, this peripheral electronic component (8) being housed at least partially in a cavity (9) of the housing (2) located at the periphery of the stator (3).

2. Electric motor (1) according to the preceding claim, in which the control electronics (7) comprise an electronic card (12) and the peripheral electronic component (8) is mechanically assembled with this electronic card (12).

3. Electric motor (1) according to the preceding claim, in which the peripheral electronic component (8) is offset relative to the electronic card (12).

4. Electric motor (1) according to the preceding claim, in which the peripheral electronic component (8) comprises connection tabs soldered to the electronic card (12), and the connection tabs (14) of the peripheral electronic component (8) are curved, in particular having a generally U-shape.

5. Electric motor (1) according to one of claims 2 to 4, wherein the peripheral electronic component (8) is placed relative to the electronic card (12) so that the peripheral electronic component (8) extends on only one side of a geometric plane (PG) of the electronic card (12).

6. Electric motor (1) according to claim 2, wherein the peripheral electronic component (8) is mounted on an extension of the electronic card (12), this extension (20) of the electronic card (12), in particular in the form of an ear forming part of the electronic card- electronics (12), being located outside the periphery of the stator (3), this extension of the electronic card (12) having a location and a shape allowing the peripheral electronic component (8) to be located on the outer periphery of the stator (3).

7. Electric motor (1) according to one of the preceding claims, in which the cavity (9) which receives the peripheral electronic component (8) has a substantially cylindrical shape with an axis parallel to the axis of rotation (Z) of the motor.

8. Electric motor (1) according to one of the preceding claims, in which the housing (2) comprises at least two cavities (9), in particular distant from each other, each to receive one of the peripheral electronic components.

9. Electric motor (1) according to one of the preceding claims, wherein the motor comprises a cover (22) configured to close the housing (2), once the electronic card (12) is inserted into the housing (2).

10. Pump (100), in particular water pump, comprising an electric motor (1) according to one of the preceding claims.

Images