Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K5/00—Casings; Enclosures; Supports
  • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
  • H02K5/15—Mounting arrangements for bearing-shields or end plates
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
  • H02K11/30—Structural association with control circuits or drive circuits
  • H02K11/33—Drive circuits, e.g. power electronics
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K5/00—Casings; Enclosures; Supports
  • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
  • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
  • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
  • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/003—Couplings; Details of shafts
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/08—Structural association with bearings
  • H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor

Definitions

• the present invention relates to the technical field of the automobile and, more particularly, to an electrical equipment intended to cooperate with a supercharging compressor for an internal combustion engine.
• the turbocharger comprises a first propeller set in motion by the gases released by the engine.
• the first propeller is coupled to a second propeller for compressing air entering the engine.
• the compression ratio of the air is therefore proportional to the flow rate of the gases discharged by the engine.
• the efficiency of the turbocharger increases as the engine speed increases.
• the exhaust gases have insufficient flow to drive the first propeller.
• the turbocharger is then ineffective until the engine has reached the critical speed. This results in a lag time during which the turbocharger is not operational. This latency is of the order of a few seconds.
• the electric supercharger comprises electrical equipment capable of driving in rotation a shaft on which is fixed at one of its ends a propeller intended to perform the same functions as the second propeller of the turbocharger.
• the propeller is housed in a compression chamber bounded to the rear by a closing plate of the engine and forwards by a volute positioned on the closure plate.
• the volute comprises an air inlet allowing the ambient air to supply the propeller, and an outlet for evacuating air compressed by the propeller.
• the propeller is rotatably coupled to a shaft held by two bearings.
• a motor torque is generated by the electrical equipment to rotate the shaft by creating a rotating magnetic field between a stator and a rotor connected to the shaft.
• the electrical equipment is controlled by an electrical control module configured to control the start-up of the electrical equipment when the heat engine is solicited at low speed, that is to say, below its critical speed.
• the electrical control module is positioned closer to the stator so as to facilitate and reduce the length of the electrical connections between the electrical control module and the electrical equipment.
• the electric supercharger advantageously reduces the latency required for the engine to develop the desired power, from a few seconds to a few hundred milliseconds.
• a known problem of electric superchargers is related to the distribution of masses on the shaft. Indeed, in the case where the angular distribution of the masses around the tree is not homogeneous, the rotation of the shaft can excite reasoning modes that cause premature wear of the shaft and / or bearings. This problem is increased with high rotation speeds. In a similar way, the axial distribution of the masses on the shaft can lead to an unstable dynamic behavior which leads to premature wear of the shaft and / or bearings. A critical speed is thus defined as the limit rotation speed of the shaft from which it is damaged.
• the object of the present invention is to respond at least in large part to the foregoing problems and further to other advantages which will become apparent from the description which follows.
• An object of the invention is to propose a new electrical equipment in order to solve at least one of these problems.
• Another object of the invention is to increase the critical speed of such an electrical equipment.
• Another object of the invention is to increase the reliability of such an electrical equipment when it cooperates with a turbocharger for a heat engine.
• the invention according to its first aspect provides an electrical equipment arranged to cooperate with a supercharger compressor for a heat engine as described above.
• the electrical equipment comprises (i) a shaft housed in a chamber of a housing, the shaft being held radially by at least a first and a second bearing, (ii) an electric machine housed in the chamber of the housing, the machine electric motor comprising a stator and a rotor coupled to the shaft, (iii) an electrical control module configured to generate a magnetic field at the stator and cause rotation of the rotor.
• the electrical equipment is characterized in that the second bearing is located axially between the electrical control module and the stator.
• the invention aims to bring the second bearing located between the closure plate of the electric machine and the stator, closer to the stator.
• the invention proposes a new technical solution of positioning the second bearing between the stator and the electrical control module so as to reduce the distance between the bearings positioned on each side of the stator.
• the weight of one or more magnets attached to the shaft exerts less force on the shaft relative to the case of the supercharger described above. Therefore, for the same weight of magnet (s) fixed (s) on the shaft, an electrical equipment according to the invention is less sensitive to the bending phenomenon of his shaft, likely to damage the electrical equipment.
• the invention therefore proposes a more reliable electrical equipment of use when it cooperates with a supercharging compressor for a heat engine.
• the electrical equipment comprises a housing formed of the housing and a front plate.
• the front plate closes the chamber of the housing.
• the electrical control module is housed in the chamber of the housing.
• the electrical control module is located between the second bearing and the front plate. According to another embodiment, the electrical control module is positioned radially relative to the shaft.
• the first bearing is located near a rear end of the shaft.
• the rear end of the shaft is closer to the stator to minimize the distance between the bearings.
• the first and second bearings are selected from a type of bearing comprising a ball bearing, a sliding bearing and a roller bearing.
• the shaft comprises a first axial locking member arranged to axially lock the second bearing on the shaft and prevent a rearward movement of the second bearing relative to the shaft.
• the first axial locking member limits the displacement of the second bearing along the shaft towards the stator.
• the shaft comprises a second axial locking member arranged to axially lock the second bearing on the shaft and prevent forward movement of the second bearing relative to the shaft.
• the second axial locking member limits the displacement of the second bearing along the shaft, in the direction of the closing plate closing the chamber of the housing.
• the front designates the side of the shaft intended to cooperate with a propeller of the supercharger; the back designates the opposite side of the shaft relative to the electric control module.
• first and / or second axial locking members are attached and fixed on the shaft (16o).
• first and / or the second axial locking members are made of material with the shaft. According to another embodiment, the first and / or the second axial locking members are formed by a shoulder at the shaft.
• the electrical equipment comprises third axial locking members of the second bearing relative to the support.
• the third axial locking members are formed by at least one spacer located axially between the closure plate closing the chamber of the housing and the second bearing, the second bearing being in abutment against the spacer.
• the spacer is made of material of the closure plate.
• the spacer is attached and fixed integrally to the closure plate.
• the second bearing is mounted on a spacer or support plate, attached and integrally fixed to the housing, the spacer extending radially between the housing and the shaft.
• the second bearing is mounted on a spacer made of material with the housing, the spacer extending radially between the housing and the shaft.
• the spacer comprises one or more passages for electrically connecting the stator to the electrical control module.
• the electrical control module comprises at least one opening for the passage of the shaft through the electrical control module.
• the electrical control module may be positioned radially relative to the shaft so as to facilitate the electrical connection between the electronic components present on the electrical module and the electric coils of the stator.
• turbocharger system comprising a compression chamber delimited by a volute within which a helix is rotated by an electrical equipment according to any one of the preceding claims, the propeller being at least rotatably coupled with the shaft.
• FIGURE 1 is a schematic view of a longitudinal section of a first embodiment of an electrical equipment according to the invention
• FIGURE 2 is a schematic view of a longitudinal section of a second embodiment of an electrical equipment according to the invention
• FIGURE 3 is a schematic view of a longitudinal section of a third embodiment of an electrical equipment according to the invention.
• FIGURE 4 is a schematic view of a longitudinal section of a fourth embodiment of an electrical equipment according to the invention.
• FIGURE 5 is a schematic view of a longitudinal section of a fifth embodiment of an electrical equipment according to the invention.
• FIG. 1 illustrates a first embodiment of a supercharging compressor according to the invention, comprising a propeller 110 present in a compression chamber 120.
• the compression chamber 120 is delimited towards the front by a volute 130 and towards the
• the volute 130 comprises a first opening 132 through which the air enters the compression chamber 120, and a second opening 134 through which the compressed air by the propeller 110 is evacuated.
• the second opening 134 is configured to be connected to the cylinders of a not shown thermal engine, via connection means also not shown to simplify the understanding of the invention.
• the volute 130 is fixed on the closure plate 142 by means of fixing screws 136.
• the supercharging compressor is fixedly secured to electrical equipment 100, 200, 300, 400 arranged to be able to rotate the propeller 110.
• the electrical equipment is linked to the supercharging compressor via the closure plate 142 which is held on a housing 144 by fixing screws 143 ⁇
• the electrical equipment thus comprises the housing 144 which defines a generally cylindrical chamber 146 located inside said housing 144 ⁇
• the closure plate 142 and the housing 144 together form the housing of an electric machine 140.
• the electric machine 140 comprises a stator 150 housed in the chamber 146.
• stator 150 forms a ring supporting electrical coils 152 arranged radially inside the chamber 146 so as to allow a shaft 160 to pass to the center of the stator 150.
• a rear end 162 of the shaft 160 is held in the chamber 146 through a first bearing 170 held in a housing 148 formed in the bottom 149 of the chamber 146. Forwards, the shaft is also maintained by a s wherein the second bearing 172 is held on the shaft 160 through a spacer 177 holding the second bearing 172 relative to the closure plate 142 of the electrical machine 140 and the stator 150. to the housing 144 ⁇
• the spacer 177 is made of material with the housing 144, forming for example an outgrowth of the wall delimiting the chamber 146.
• the spacer 177 extends radially with respect to its wall, so as to forming a disk comprising an opening in its center for maintaining the second bearing 172.
• the second bearing 172 is fitted into the spacer 177 to ensure its maintenance along the shaft l60.
• the bearings 170 and 172 are aligned so that the shaft 160 passes to the center of the stator 150.
• the shaft 160 comprises at least one permanent magnet 164 arranged to collaborate with the electrical coils 152 and the effect of the rotating magnetic field created at the electrical coils 152, rotate the shaft l60.
• the propeller 110 held at a front end 163 of the shaft 160 and rotatably coupled to the shaft 160 is rotated.
• an electric coil 152 is formed by the winding of a conductive element around an appendage 153 of the stator 150.
• the electrical coils 152 are electrically powered via an electrical control module 180 comprising electronic components 182 for synchronizing the supply of the electric coils to generate a motor torque at the shaft 160.
• the electrical control module 180 is located between the second bearing 172 and the closure plate 142 of the electrical machine 140. More specifically, the electrical control module 180 is fixed on the housing 144 by fixing screws 183 so that its support 184 is positioned radially with respect to the shaft 160.
• the electrical control module 180 has an opening 186 at its center, to allow the passage of the shaft 160.
• the electronic components 182 are positioned vis-à-vis the electrical coils 152 they feed.
• the spacer 177 has passages 178 for electrically connecting the electronic components to the electrical coils.
• the spacer 177 makes it possible to minimize the difference between the bearings 170 and 172 in order to limit the phenomenon of sagging in time of the shaft, due to the weight of one or more permanent magnets 164 fixed on the tree.
• the electrical control module 180 is positioned between the closure plate 142 and the second bearing 172, so that the electrical module of control is mounted or disassembled independently of the second bearing.
• the alignment of the shaft 160 with the stator 150 is not susceptible to change when the electrical control module is put in place or removed. The invention therefore allows easier mounting and maintenance of the electrical control module.
• an electrical device 200 may comprise a shaft 160 comprising a first axial locking member formed by a shoulder 166 making it possible to block the axial displacement of the second bearing 172 in the direction of the stator 150.
• the shaft may also comprise a second axial locking member formed by a radial bore 167 capable of holding a lug 168 in order to block the displacement of the second bearing 172 in the direction of the closure plate 142 of the electric machine 140.
• electrical electrical equipment 300 may comprise a third axial locking member formed by an appendage 190.
• appendix 190 may be made of material with the closure plate 142 or be attached and linked to the closure plate by means of fastening means such as for example by welding, gluing or fixing screws.
• the appendix 190 makes it possible axially to block the second bearing 172 while resting on a lateral edge of said second bearing 172, preventing an axial movement towards the front.
• the appendix 190 forms a spacer 190 blocking the movement of the second bearing 172 in the direction of the closure plate 142 of the electric machine.
• the spacer 190 extends angularly all around the shaft 160 so as to allow better maintenance of the second bearing 172.
• the spacer 177 shown in FIGURES 1 and 2 can also form a third axial locking member according to the invention.
• the third or third axial locking members may be combined or substituted for the first and / or second axial locking members.
• an electrical equipment 400 can combine the second and third embodiments in order to ensure an optimal maintenance of the second bearing 172 on the shaft 160. ie, combine the first axial locking member with the third axial locking members 177 and 190.
• electrical equipment 500 may be a variant of the fourth embodiment, consisting of providing a passage 192 in the spacer 190.
• the passage 192 is configured for the passage a measurement means 194 connected to the electrical control module 180, enabling said module to know in real time the angular position of the magnet 164 fixed on the shaft 160 relative to the electric coils 152.
• the various embodiments of the invention described above can be made separately or be combined with each other in order to obtain other embodiments.
• the second bearings 172 mentioned above correspond to a ball bearing as shown in FIG. 3. More precisely, the ball bearing comprises several balls 174, held between an inner ring 175 and an outer ring 176.
• the ring The outer casing 176 is held in the housing 144 of the electric machine through the third locking members, and the inner ring 175 can be held by the first and / or second axial locking members described above.
• the second bearings mentioned above can be slidably mounted on the shaft, so as to tolerate a certain degree of thermal expansion of the various components of the electric machine.

Applications Claiming Priority (2)

Publications (1)

Family

ID=57396560

Family Applications (1)

Country Status (3)

Family Cites Families (5)

• 2016
  • 2016-07-08 FR FR1656585A patent/FR3053853B1/fr active Active
• 2017
  • 2017-07-07 WO PCT/FR2017/051865 patent/WO2018007771A1/fr unknown
  • 2017-07-07 EP EP17745842.9A patent/EP3482479A1/de not_active Withdrawn

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