FR3088774A1 - ELECTRIC ACTUATOR - Google Patents

Abstract

The subject of the invention is an assembly for an electric actuator, in particular an actuator adapted to drive a mobile element (20) of a heating, ventilation and / or air conditioning system for a motor vehicle, comprising: - an electronic card (14), in particular a printed circuit board, a stator of an electric motor of the actuator, this stator comprising at least two electric coils defining stator poles for interacting with a rotor of the electric motor, these coils being carried by the electronic card, - an electrical connection pin (54) for ensuring the electrical connection of one of the coils with a conductive track of the electronic card, this pin comprising a connecting leg with the conductive track, this leg (57) extending between two adjacent coils (52) carried by the electric card.

Description

The present invention relates to an electric actuator adapted to drive a movable element for a heating, ventilation and / or air conditioning system for a motor vehicle.

The invention also relates to an assembly for this type of actuator.

The invention is particularly dedicated to actuators used to control the position of a flap inside an HVAC.

It finds a particular, but not limiting, application in heating, ventilation and / or air conditioning systems for motor vehicles.

An electric actuator adapted to drive a mobile element for a heating, ventilation and / or air conditioning system for a motor vehicle, known to a person skilled in the art, comprises for example:

- an electric motor comprising a stator and a rotor;

- a satellite ring comprising at least one satellite;

- an output wheel adapted to be rotated by said satellite gear;

- a drive shaft in connection with the electric motor and adapted to rotate said satellite gear.

Patent applications US2017149300 and FR3030151 describe such actuators.

Furthermore, most of the actuators are not small enough to be able to be integrated directly on the axis of the flaps. The actuator is located far from the axis. It therefore becomes necessary to use a kinematic mechanism to connect the actuator and the flap axis. And the use of the kinematic mechanism reduces efficiency, uses too much space, induces additional noise and increases the risk of weakness.

A large actuator has the following disadvantages.

The space around the HVAC (near the actuator) is used for other components (pipe, stiffener under the dashboard, PTC heating, ...).

A wide actuator does not allow standardization of the HVAC.

It therefore becomes necessary to improve the mechatronic integration of the internal elements of the actuator in order to reduce the size, in particular the printed circuit.

The invention aims to remedy these drawbacks.

The subject of the invention is therefore an assembly for an electric actuator, in particular an actuator adapted to drive a mobile element of a heating, ventilation and / or air conditioning system for a motor vehicle, comprising:

- an electronic card, in particular a printed circuit card,

a stator of an electric motor of the actuator, this stator comprising at least two electric coils defining stator poles for interacting with a rotor of the electric motor, these coils being carried by the electronic card,

an electrical connection pin for ensuring the electrical connection of one of the coils with a conductive track of the electronic card, this pin comprising a leg connecting with the conductive track, this leg extending between two neighboring coils carried by the electric card.

Thanks to the invention, it is possible to have a more compact actuator, the electrical connections being made by pins which does not add bulk to the thickness of the actuator.

According to one aspect of the invention, the assembly comprises for each electrical coil, two pins which each have a leg which extends between two neighboring coils, each pin of the pair of pins being connected to one end of the associated coil.

According to one aspect of the invention, the two pins of the same coil are symmetrical to each other by a plane of symmetry which passes through the center of the electric motor.

According to one aspect of the invention, the leg of the pin which is connected to the conductive track has a rectilinear shape.

According to one aspect of the invention, the pin has a bend between a high portion and the leg which goes towards the card, the high portion connecting to the coil.

According to one aspect of the invention, the elbow is at a right angle.

According to one aspect of the invention, the spindle, in particular the upper portion of the spindle, is at least partially inserted into an insulator made of electrically insulating material, in particular this insulator comprising a hub around which the wires of the coil are wound.

According to one aspect of the invention, the pin is at least partially molded by the material of the insulator.

According to one aspect of the invention, the two pins of the same coil are inserted into this insulator.

According to one aspect of the invention, the pin has a wafer flush with the insulator. In other words, the pin has a slice which is at the same level as the region of the insulator which is adjacent to it.

According to one aspect of the invention, the insulator of each coil and the two associated pins form an integral sub-assembly.

According to one aspect of the invention, the pins are for example made of metal, in particular steel.

According to one aspect of the invention, the insulator comprises an outer wall in which the pin or pins are at least partially inserted and a radially inner wall, and the coil is disposed between these inner and outer walls. These walls are substantially parallel.

According to one aspect of the invention, the assembly comprises three or six coils, in particular equi-angularly distributed around the rotor.

According to one aspect of the invention, the electronic card carries a package of sheets which is part of the stator body.

According to one aspect of the invention, the electronic card has an annular shape, in particular with radially inner and outer edges, in particular concentric.

According to one aspect of the invention, the card has at least one slot, in particular open on the outer rim, and the insulator extends at least partially in this slot.

According to one aspect of the invention, all the insulators extend into an associated slot.

According to one aspect of the invention, part of the coil also extends into this slot. In other words, the coil extends on both sides of the card, while extending more on one side than on the other. The reel height is greater on one side of the card than on the other.

According to one aspect of the invention, the electric wire forming the coil has an end which is connected to the pin, this end being situated at a height H of the card, substantially on the top of the coil.

According to one aspect of the invention, the pin comprises, on a side furthest from the electronic card, in particular the upper one, a stud around which the end of the wire forming the coil is wound.

According to one aspect of the invention, the stud is heard outside the insulator.

As a variant, the insulator has a notch to receive one end of the wire forming a coil, and the pin associated with this end of electric wire presses on this end of wire to make the electrical contact, the pin then being opposite the notch which receives the end of the wire.

In this case, the path of the wire is as follows: The wire first crosses the notch then finds itself in contact with a lower edge of the spindle, edge facing the card, then the wire goes up on an upper edge of the insulator.

According to one aspect of the invention, the insulator and the pins are assembled mechanically.

According to one aspect of the invention, the electronic card can be rectangular or circular in shape or cut out with more complex shapes.

According to one aspect of the invention, the printed circuit board directly receives the pins, in particular the pin legs, through holes on the card. The connection pins on the printed circuit board could be held in place by welding or, alternatively, by mechanical pressure.

This is to prevent vibration or a faulty contact.

According to one aspect of the invention, the card comprises a connection zone over which extends electrical conductors, in particular of rectilinear shape running on the surface of the card, conductors for the electrical connection of the stator to an electrical supply external to the motor. .

The invention also relates to an actuator adapted to drive a mobile element (20) of a heating, ventilation and / or air conditioning system for a motor vehicle, this actuator comprising an electric motor and an assembly according to one of the preceding claims.

According to one aspect of the invention, the actuator has a thickness of between 10 mm and 30 mm.

The invention also relates to a heating, ventilation and / or air conditioning system for a motor vehicle, comprising an actuator according to the preceding claim.

The invention and its various applications will be better understood on reading the description which follows and on examining the figures which accompany it:

- Figures 1 to 4 schematically represent an actuator according to a non-limiting embodiment of the invention;

- Figures 5 and 6 show two examples of implementation of the invention.

The electric actuator 1 according to the invention is described with reference to Figures 1 to 3.

The electric actuator 1 is adapted to drive a mobile element 20 (illustrated diagrammatically in FIG. 1) of a heating, ventilation and / or air conditioning system (not illustrated), commonly called HVAC system "Heating Ventilation and Air Conditioning >> in English, for motor vehicle.

In the following description, the heating, ventilation and / or air conditioning system is also called an HVAC system.

The electric actuator 1 is suitable for mounting in the HVAC system.

An HVAC system provides thermal management of a passenger compartment of the motor vehicle. It allows the movement of an air flow sent into the passenger compartment, as well as its thermal conditioning, in particular with a view to heating and / or cooling said passenger compartment.

To this end, the HVAC system comprises a heat exchanger making it possible to provide a heating function, in particular a radiator, and a heat exchanger making it possible to provide a cooling function, in particular an evaporator. The air flow circulating in the HVAC system is channeled to one and / or the other of the heat exchangers to achieve the desired thermal conditioning.

The circulation of the air flow through the heat exchangers and the selective distribution of the treated air flow to the various areas of the passenger compartment mentioned above is effected by the actuation of mobile elements 20, arranged at the through distribution conduits in the HVAC system. A mobile element 20 is electrically controlled each by an electric actuator 1 or more mobile elements 20 are electrically controlled by an electric actuator 1. The electrical set point they receive from the electric actuator 1 is transformed into a movement of the mobile elements 20 for bring them to a certain position. The electric actuator 1 thus makes it possible to automatically control one or more mobile elements 20.

These mobile elements 20 are air flaps.

As illustrated in Figures 1 and 2, the electric actuator 1 comprises: an electric motor 10 comprising a stator 100 and a rotor 101; a drive wheel 11;

a satellite ring 12 comprising at least one satellite 120;

an output wheel 13.

The drive wheel 11, the satellite gear 12 and the output wheel 13 form a gear train which is a speed reducer.

The electric actuator 1 also comprises an electronic card 14.

The electric actuator 1 also comprises a housing 15.

As illustrated in FIGS. 1 to 3, the electric motor 10, the drive wheel 11, the satellite gear 12, and the output wheel 13 are coaxial. Thus, they extend along the same axis which is the motor axis 102 of said electric motor 10.

As illustrated in FIG. 1, it will be noted that the axis of the mobile element 20 is also coincident with the motor axis 102.

The different elements of the electric actuator 1 are described in detail below.

The housing 15 makes it possible to mount the electric actuator 1 in the HVAC system.

The housing 15 is adapted to receive the electric motor 10, the drive wheel 11, the satellite crown 12 and the output wheel 13. Thus, the electric motor 10, the drive wheel 11, the satellite crown 12 and the output wheel 13 are housed in a single housing 15.

In a nonlimiting embodiment, the housing 15 further comprises an electrical plug which forms an electrical interface between the electronic card 14 described below and an electrical connector (not illustrated) which transmits control signals and power signals for respectively controlling and supplying said electronic card 14. These control signals and power signals are generated by an electronic control unit (not shown) of the motor vehicle.

The electric motor 10 is a bipolar stepper motor or a three-phase motor, preferably a brushless motor.

It is housed in the housing 15.

The electric motor 10 comprises a motor axis 102 illustrated in FIGS. 1 and 3.

The rotor 101 is an internal rotor, that is to say it is inside the stator 100. Thus, it is nested in the stator 100.

The stator 100 is of hollow annular shape and comprises a series of copper coils surrounding the rotor 101.

The electric motor 10 is adapted to drive the driving wheel 11 in rotation, thus ensuring the rotation of the satellite gear 12 and of the output wheel 13, and consequently the setting in motion of the mobile element 20.

More particularly, the rotor 101 of the electric motor 10 is adapted to drive the driving wheel 11 in rotation.

As described above, in a nonlimiting embodiment, the drive wheel 11 is integral with the rotor 101.

The drive wheel 11 is suitable for:

- be driven in rotation by the rotor 101 of the electric motor 10 as described above; and

- be driven in rotation by the satellite crown 12.

The driving wheel 11 rotates around the motor axis 102.

The satellite crown 12 is illustrated in FIG. 1.

The satellite crown 12 includes:

- at least one satellite 120;

- A support 121, otherwise called satellite carrier.

A satellite 120 is also called planetary.

The satellite crown 12 is suitable for:

- be driven in rotation by the drive wheel 11 as described above;

- rotate the output wheel 13.

The output wheel 13 is illustrated in FIG. 1.

The output wheel 13 is suitable for:

- be driven in rotation by the satellite crown 12 as seen above;

- drive the movable element 20 of the HVAC system.

The electronic card 14 is flat and extends in a plane perpendicular to the motor axis 102. The extension plane thus crosses the motor axis 102.

The electronic card 14 is connected to the coils 104 of the stator 101 and thus allows their electrical supply.

The electronic card 14 is in a nonlimiting example a printed circuit card called PCBA in English (“Printed Circuit Board Assembly”).

We will describe with reference to Figures 4 to 6 an electronic card of an assembly according to examples of the invention.

In particular, there is shown with reference to Figure 4, an assembly 50 for electric actuator 1 according to an exemplary embodiment of the invention, actuator adapted to drive a movable element of a heating, ventilation and / or air conditioning system for motor vehicle, comprising:

- the printed circuit board 14,

the stator 100, this stator comprising several electric coils 52 defining stator poles for interacting with the rotor 101 of the electric motor 10, these coils being carried by the electronic card 14,

an electrical connection pin 54 for ensuring the electrical connection of each of the coils 52 with a conductive track, not shown, of the electronic card 14, each pin 54 comprising a connecting leg 57 with the conductive track, this leg 57 s' extending between two neighboring coils 52 carried by the electric card 14.

The assembly 50 comprises for each electrical coil 52, two pins 54 which each have a leg 57 which extends between two adjacent coils 52, each pin 54 of the pair of pins being connected to one end of the associated coil 52.

The two pins 54 of the same coil are symmetrical to each other by a plane of symmetry 58 which passes through the center of the electric motor 10.

The leg 57 of the pin which is connected to the conductive track has a rectilinear shape.

The pin 54 has a bend 59 between an upper portion 60 and the leg 57 which points towards the card, the upper portion 60 connecting to the coil 52.

The elbow 59 is at a right angle.

The upper portion 60 of the spindle is at least partially inserted into an insulator 65 made of electrically insulating material, in particular this insulator comprising an insulating hub around which the wires 63 of the coil are wound.

Each pin 54 is at least partially overmolded by the material of the insulator 65.

The two pins 54 of the same coil 52 are inserted into this insulator 65.

Each pin 54 has a wafer 67 coming flush with the insulator 65. In other words, the pin 54 has a wafer 67 which is at the same level as the region 68 of the insulator which is adjacent to it.

The insulator 65 of each coil and the two associated pins 54 form an integral sub-assembly.

The pins 54 are for example made of steel.

The insulator 65 has an outer wall 70 in which the pin or pins 54 are at least partially inserted and a radially inner wall 71, and the coil 52 is disposed between these inner 71 and outer 70 walls. These walls are substantially parallel.

The assembly comprises three or six coils 52, in particular equiangularly distributed around the rotor.

The electronic card 14 carries a packet of sheets 75 which is part of the stator body. The sheet metal pack 75 forms openings 76 through which pass legs 57, and have sections 77 bearing on the insulators 65, on a radially outer face 78 of these insulators.

The electronic card 14 has an annular shape, with a radially inner edge 79 that is circular.

The card 14 has at least one slot 81, open on the outer edge 82, and the insulator 65 extends at least partially in this slot 81.

All the insulators 65 extend into an associated slot 81.

Part of each coil 52 also extends into this slot 81. In other words, the coil 52 extends on either side of the card 14, while extending more on one side than on the other. The height of the reel 52 is greater on one side of the card 14 than on the other.

The electric wire forming the coil has an end 85 which is connected to the respective pin 54, this end 85 being located at a height H of the card 14, substantially on the top of the coil 52.

In the example of FIG. 5, the pin 54 comprises, on a side 89 furthest from the electronic card, in particular upper, a stud 91 around which the end 85 of the wire forming the coil is wound.

The stud 91 extends outside of the insulator 65.

As a variant, as illustrated in FIG. 6, the insulator 65 has a notch 92 for receiving one end 85 of the wire forming the coil, and the pin 54 associated with this end of electric wire presses on this end 85 of wire to produce the electrical contact, the pin 54 then being opposite the notch which receives the wire end.

In this case, the path of the wire is thus: The wire first crosses the notch 92 then finds itself in contact with a lower edge of the spindle 54, edge facing the card 14, then the wire goes up on an upper edge 95 of insulator 65.

The insulator 65 and the pins are mechanically assembled.

The electronic card can be rectangular or circular in shape or cut out with more complex shapes.

The printed circuit board 14 directly receives the pins 54, in particular the pin legs, through holes 99 on the card. The connection pins on the printed circuit board could be held in place by welding or, alternatively, by mechanical pressure.

The card 14 includes a connection zone 700 on which extends electrical conductors 701, in particular of rectilinear shape running on the surface of the card, conductors for the electrical connection of the stator to an electrical supply external to the motor.

The actuator has a thickness between 10 mm and 30 mm.

Claims (10)

1. An assembly for an electric actuator, in particular an actuator adapted to drive a mobile element (20) of a heating, ventilation and / or air conditioning system for a motor vehicle, comprising: - an electronic card (14), in particular a printed circuit card, a stator of an electric motor of the actuator, this stator comprising at least two electric coils defining stator poles for interacting with a rotor of the electric motor, these coils being carried by the electronic card, - an electrical connection pin (54) for ensuring the electrical connection of one of the coils with a conductive track of the electronic card, this pin comprising a connecting leg with the conductive track, this leg (57) extending between two adjacent coils (52) carried by the electric card. 2. An actuator assembly according to claim 1, comprising for each electric coil, two pins (54) which each have a leg which extends between two adjacent coils, each pin of the pair of pins being connected to one end of the coil. associated. 3. An actuator assembly according to the preceding claim, wherein the two pins of the same coil are symmetrical to each other by a plane of symmetry which passes through the center of the electric motor. 4. An actuator assembly according to one of the preceding claims, in which the pin has an elbow between a high portion and the leg which goes towards the card, the high portion connecting to the coil. 5. An actuator assembly according to one of the preceding claims, in which the pin comprises, on a side furthest from the electronic card, in particular upper, a stud (91) around which is wound the end of the wire forming the coil . 6. An actuator assembly according to one of the preceding claims, in which the spindle, in particular the upper portion of the spindle, is at least partially inserted into an insulator (65) made of electrically insulating material, in particular this insulator (65) comprising a hub around which the coil wires are wound. 7. An actuator assembly according to claim 6, in which the insulator (65) has a notch (92) for receiving one end of the wire forming a coil, and the pin associated with this end of electric wire presses on this end of wire. to make the electrical contact, the pin then being opposite the notch which receives the wire end. 8. An actuator assembly according to one of the preceding claims, in which the printed circuit board directly receives the pins, in particular the pin legs, through holes on the card. 9. Actuator adapted to drive a mobile element (20) of a heating, ventilation and / or air conditioning system for a motor vehicle, this actuator comprising an electric motor and an assembly according to one of the preceding claims. 10. Heating, ventilation and / or air conditioning system for a motor vehicle, comprising an actuator according to the preceding claim.