Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/12—Stationary parts of the magnetic circuit
• • 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
  • H02K11/0094—Structural association with other electrical or electronic devices

Definitions

• the present invention relates to the field of electrical machines, and relates more particularly to electrical machines having at least one stator.
• An electric machine is a machine, also called a motor, which has at least one stator.
• the stator has teeth surrounded by the coils.
• the supply of each of the coils allows the creation of a magnetic field in the stator, a rotor oriented along the field lines.
• these electrical machines are for example used in electrical systems such as electric compressors.
• these machines are used on the intake circuit to improve the efficiency of the vehicle, to overcome the latency of the conventional turbocharger at startup, or in the transient phases of the vehicle.
• this type of machine is a source of noise.
• the electromagnetic forces generated on the stator and the rotor induce micro-displacements at high frequency and in the audible range of the human ear, between 1000 and 20000Hz.
• the vibrations are transmitted throughout the structure of the machine, and propagate in the air and in the supports of the machine. If the noise from the machine to the support can be reduced by dampers, the noise intrinsic to the machine is more difficult to deal with.
• One solution to this noise is to reduce the effects of radial forces.
• the effects of radial forces are reduced, for example, by providing material recesses on the outer face of the stator, in the extension of the stator teeth.
• Such a solution allows a gain of deformation, to reduce the effects of radial forces on the part in contact with the stator. This gain contributes to the partial reduction of noise, which is still audible by a human ear.
• the present invention therefore aims to overcome one or more of the disadvantages of the machines of the prior art by providing an electrical machine configured to limit noise.
• the piezoelectric reduces the noise caused by the electric machine.
• the present invention proposes an electric machine comprising at least one stator, the stator being formed of a body and teeth arranged on the internal face of the stator body, characterized in that the stator comprises at least one piezoelectric element.
• the piezoelectric is arranged in the extension of a stator tooth.
• the piezoelectric is offset relative to a stator tooth.
• At least one piezoelectric is disposed on the outer surface of the stator.
• At least one piezoelectric element is integrated in the stator body.
• the stator comprises between 4 and 20 piezoelectric.
• the invention also relates to the use of the electric machine according to the invention in an electric supercharger for a motor vehicle.
• the invention also relates to an electric supercharger equipped with an electric machine according to the invention.
• FIG. 1 is a schematic representation of a sectional view of the device concerned by the present invention
• FIG. 2 is a schematic representation of a sectional view of a part of the device according to another variant of the invention.
• FIG. 3 is a schematic representation of a sectional view of part of the device of an embodiment of the variant of FIG. 3, - Figure 4 is a schematic representation of a portion of the device according to one embodiment of the invention a) perspective view, b) sectional front view.
• the present invention relates to an electric machine 1 illustrated in FIG. 1.
• the electric machine 1 comprises at least one stator 2.
• the electric machine also comprises a rotor 3 disposed inside the stator 2. More precisely, the rotor 3 is disposed in a space 4 formed in the center of the stator 2.
• the electrical machine is a continuous or alternating current machine, synchronous or asynchronous or any type of electric machine of the same type.
• the electrical machine is a variable reluctance motor (also called SRM machine for Switched Reluctance Motor according to the English terminology) defined by the same characteristics as the electric machine according to the invention.
• the electric motor is a permanent magnet motor.
• the stator 2 is formed of at least one body 21. According to one embodiment of the invention, the stator is formed of several bodies, illustrated in FIGS. 2 to 4. The stator is also formed of several teeth 22. The teeth 22 are disposed on the inner face 221 of the stator body defining the space 4 in which the rotor is located.
• the stator 2 has n teeth 22, n being greater than or equal to 4, preferably between 4 and 20, preferably between 4 and 12, and very preferably equal to 6.
• Around each of the teeth 22 is arranged a winding which thus forms the coils 23 of the stator. The supply of each of the coils 23 allows the creation of a magnetic field in the stator 2.
• the rotor 3 comprises rotor teeth 32 oriented along the field lines of the stator 2.
• the number of teeth of the rotor 3 is between 2 and 8, and preferably is equal to 4.
• piezoelectric means an element having the property of generating a deformation of the material by the application of an electric potential. It is this field or electrical potential which thus causes a mechanical counter-stress which is used in the context of the invention to reduce vibrations resulting from mechanical stresses such as radial forces on the part which is in contact with the stator. It is thus possible to reduce the noise caused by the electric machine.
• the piezoelectric 5 are of standard form.
• the piezoelectric 5 is a rectangular parallelepiped.
• the piezoelectric 5 has any shape adapted to its position in or on the stator. If necessary, the piezoelectric 5 may be slightly curved to follow the rounded shape of the stator contour.
• the stator 2 comprises at least one piezoelectric element 5.
• the stator 2 comprises between 4 and 20 piezoelectric 5, preferably between 4 and 12 piezoelectric 5, and very preferably 6 piezoelectric 5.
• the stator 2 comprises a piezoelectric number equal to the number of teeth 22 of the stator 2.
• At least one piezoelectric element 5 is disposed on the outer surface 222 of the stator 2.
• the outer face 222 of the stator 2 is the one which does not have a tooth 22 and which is disposed outside the stator 2 if it is considered that the internal face 221 of the stator defines a zone 4 of the stator 2 in which the rotor 3 is arranged.
• the piezoelectric 5 is disposed in the extension of a tooth 22 of the stator 2.
• the piezoelectric 5 is offset with respect to a tooth 22 of the stator 2. More precisely, the piezoelectric 5 is disposed on the surface 222 of the stator 2 between two teeth 22 of the stator 2. According to one embodiment, the piezoelectric 5 is disposed on the surface of the stator 2 so as to form an angle of 90 ° relative to a tooth 22 of the stator 2, when the stator has six teeth.
• the piezoelectric 5 is disposed in an external recess 25 formed on the outer face 222 of the stator, illustrated in FIGS. 2 and 3.
• This external recess 25 forms a groove oriented along the axis 31 of the rotor 3.
• at least one piezoelectric element 5 is integrated in the stator 2, more precisely is integrated in the body 21 of the stator 2.
• the piezoelectric 5 extends longitudinally in the body 21 of the stator, along the longitudinal axis 31 of the stator. More precisely, the piezoelectric 5 extends parallel to the axis 31 of the stator.
• the piezoelectric 5 is disposed in the extension of a stator tooth.
• the piezoelectric 5 is offset relative to a tooth 22 of the stator 2. More specifically, the piezoelectric 5 is disposed in the body 21 of the stator 2 between two teeth of the stator. According to one embodiment, the piezoelectric 5 is disposed in the body 21 of the stator so as to form an angle of 90 ° with respect to a stator tooth, when the stator comprises six teeth.
• At least one piezoelectric 5 is disposed in at least one internal recess 24.
• This internal recess 24 is formed in the body 21 itself of the stator and extends longitudinally along the longitudinal axis 31 of the stator. More specifically, the internal recess 24 extends parallel to the axis 31 of the stator.
• the piezoelectric 5 extends over part of the length of the stator.
• the piezoelectric 5 extends over the entire length of the stator.
• connection son do not need to cross the parts of the electrical machine to be connected to a control system and / or power supply.
• the connection son or piezoelectric open at one end of the stator.
• the wires are connected to the control electronics of the electric machine.
• Such a stator 2 according to the invention allows a gain of 10 to 20 db.
• the invention also relates to the use of such a machine 1 according to the invention in an electric supercharger for a motor vehicle.
• the invention also relates to an electric supercharger equipped with such a machine 1 according to the invention. More specifically, the invention also relates to an electric compressor equipped with a variable-reluctance motor according to the invention.
• This electric supercharger compressor for a motor vehicle comprises a compression wheel and an electric machine according to the invention for driving the compression wheel in rotation.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Iron Core Of Rotating Electric Machines (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

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Family Applications (1)

Country Status (3)

Citations (3)

Family Cites Families (4)

• 2014
  • 2014-12-12 FR FR1462366A patent/FR3030617B1/fr not_active Expired - Fee Related
• 2015
  • 2015-12-11 EP EP15816826.0A patent/EP3231063A1/de not_active Withdrawn
  • 2015-12-11 WO PCT/FR2015/053449 patent/WO2016092233A1/fr active Application Filing

Patent Citations (3)

Non-Patent Citations (1)

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