Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K3/00—Details of windings
  • H02K3/46—Fastening of windings on the stator or rotor structure
  • H02K3/52—Fastening salient pole windings or connections thereto
  • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
  • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K3/00—Details of windings
  • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
  • H02K3/28—Layout of windings or of connections between windings
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
  • H02K2203/09—Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations

Definitions

• the present invention relates to the field of three-phase electric motors and in particular three-phase electric motors intended to equip electric bicycles.
• Electric bikes are becoming more and more popular because of the ease of movement they provide while having reduced energy consumption, environmental impact and cost price.
• connection frames In order to limit the size, it is necessary to limit both the external diameter of the stator as well as its axial length. In order to limit the diameter of the stator, it is known to arrange the connecting frames ensuring the connections between the coils of the stator arranged circularly in the center of the circle formed by the coils. However, the connection frames must be electrically isolated from each other, which tends to increase the axial length of the stator.
• the supply of the phases u, v, w of the stator is generally carried out by supply terminals or input terminals or positive terminals (intended to be connected to a positive terminal of a power source) associated at different stages.
• these supply terminals are generally distant from each other, the coils to be supplied from each of the phases being arranged at 120° from each other as shown in FIG. 1 where the terminals supply of each phase are indicated by hexagons and the coils by discs.
• Output terminals or negative terminals are arranged diametrically opposite the power supply terminals or input terminals of the respective phases.
• Figures 2 to 6 represent the different layers c1, c2, c3, c4, c5 of connection frames making it possible to make the different connections between the coils to obtain a three-phase star connection in the case of an 18-coil stator (6 coils per phase).
• the layer c1 of FIG. 2 ensures the connections of the coils of the first phase.
• the layer c2 of FIG. 3 ensures the connections of the coils of the second phase.
• the layer c3 of FIG. 4 ensures the connections of the coils of the third phase.
• the layers of FIGS. 5 and 6 ensure the connection between the phases to obtain the star connection.
• stator for a three-phase electric motor comprising:
• connection frames arranged on different layers superposed axially and electrically insulated from each other, said connection frames being configured to ensure the connections between the coils of the different phases according to a predetermined electrical diagram and to ensure the supply of the different phases via three supply terminals associated with the respective phases, in which the supply direction of one of the phases is reversed (i.e. the location of the supply and output terminals of this phase are inverted) with respect to the other two phases to limit the angular difference between the power supply terminals associated with the power supplies of the different phases.
• connection frames associated with the supply terminals allowing the supply of the different phases are arranged on the same layer of connection frames.
• connection frames associated with the power supply of the two other phases extend in the direction of the connection frame associated with the power supply of the phase whose direction of supply is reversed to receive the associated power terminal in order to reduce the angular difference between the power terminals associated with the power supply of the different phases.
• connection frame layers is used to achieve:
• the predetermined electrical diagram is a star or delta connection.
• the stator comprises eighteen coils, each phase comprising a first and a second branch of three coils connected in series and in which the connection frames are distributed over five layers.
• a first and a second lead frame layers respectively comprise the lead frames associated with the connections of the coils of a first and a second phase
• a third lead frame layer comprises the lead frames associated with a first part of the connections of the coils associated with the third phase
• a fourth layer comprises the power lead frames of the phases and a lead frame for paralleling the first three branches associated with the three phases
• a fifth layer comprises the connection frames associated with the second part of the connections of the coils of the third phase and a connection frame for paralleling the three second branches associated with the three phases.
• the inversion of the supply direction of a phase is obtained by inverting the connections between the inputs and the outputs associated with the phase, that is to say the supply terminal or input terminal or positive terminal (intended to be connected to a positive terminal of a power source) and the output terminal or negative terminal (intended to be connected to a negative terminal of a power source or to mass).
• the reversal of the supply direction of a phase is obtained by reversing the winding direction of the phase.
• the present invention also relates to an electric motor comprising a stator as described above.
• FIG.1 represents a schematic view of a stator and the associated connections to supply the coils according to an embodiment of the state of the art
• FIG.2 represents a schematic view of a first layer of connection frames associated with the connections of the coils of a first phase as well as a supply terminal allowing the supply of the first phase according to an embodiment of the state of the art; ;
• FIG.3 represents a schematic view of a second layer of connection frames associated with the connections of the coils of a second phase as well as a supply terminal allowing the supply of the second phase according to an embodiment of the state of the art;
• FIG.4 represents a schematic view of a third layer connection frames associated with the connections of the coils of a third phase as well as a supply terminal allowing the supply of the third phase according to an embodiment of the state of the art;
• FIG.5 represents a schematic view of a fourth layer of connection frames associated with a first part of the connections between the coils of the different phases to obtain a star connection according to an embodiment of the state of the art
• FIG.6 shows a schematic view of a fifth layer of connection frames associated with a second part of the connections between the coils of the different phases to obtain a star connection according to an embodiment of the state of the art
• FIG.7 shows a schematic view of a stator according to an embodiment of the present invention comprising certain layers of lead frames
• FIG.8 represents a first layer of connection frames associated with the connections of the coils of a first phase
• FIG.9 shows a schematic view of a stator according to an embodiment of the present invention comprising certain layers of lead frames
• FIG.10 represents a second layer of connection frames associated with the connections of the coils of a second phase
• FIG.11 shows a schematic view of a stator according to an embodiment of the present invention comprising certain layers of lead frames
• FIG.12 represents a third layer of connection frames associated with part of the connections of the coils of a third phase
• FIG.13 represents a fourth layer of connection frames associated with the supply of the phases via supply terminals and with a first part of the connections between the coils of the different phases to obtain a star connection;
• FIG.14 represents a fifth layer of connection frames associated with a second part of the connections between the coils of the different phases to obtain a star connection and with a second part of the connections of the coils of the third phase;
• FIG.15 shows a superposition of the different lead frame layers according to an embodiment of the present invention
• FIG.16 shows a schematic view of a stator according to another embodiment of the present invention comprising certain layers of lead frames; In these figures, identical elements bear the same references.
• first element or second element as well as first parameter and second parameter or else first criterion and second criterion, etc.
• first criterion and second criterion etc.
• it is a simple indexing to differentiate and name elements or parameters or criteria that are close, but not identical. This indexing does not imply a priority of one element, parameter or criterion over another and it is easy to interchange such denominations without departing from the scope of the present description. Nor does this indexing imply an order in time, for example, to assess such and such a criterion.
• a reference composed of a number and a letter, for example 10a designates a particular element, here a particular connection frame of a generic class of elements corresponding to the number, here the reference 10 designates all of the connection frames 10a, 10b....
• the present invention relates to a stator 1 for a three-phase electric motor.
• the electric motor comprises a plurality of coils 5 arranged on a stator body 3.
• the stator 1 comprises eighteen coils 5, ie six coils 5 per phase.
• the phases are configured in a star arrangement, each phase comprises a first and a second branch of three coils connected in series. However, a different number of coils 5 or a different configuration, for example in a triangle, can also be used.
• the stator body 3 comprises a plurality of teeth 7 coming for example from material with a yoke 9 as shown in Figure 7 but other configurations for example with separate teeth 7 can also be used without departing from the scope of the present invention. .
• the coils 5, represented schematically by disks in the figure 7, are formed by winding turns of a winding wire around the teeth 7.
• the teeth 7, and therefore the coils 5, are distributed circularly on the stator body 3.
• the coils 5 are arranged so as to limit the number of connections between the non-adjacent coils 5.
• the electrical connections between the non-adjacent coils 5 are made by connection frames 10 arranged in the center of the coils 5.
• the stator 1 comprises a set of connection frames 10 arranged on different layers superimposed axially and electrically insulated from each other. others.
• the connection frames 10 are configured to ensure the connections between the coils 5 of the different phases according to a predetermined electrical diagram, here a star connection but other connections, for example in a triangle are also possible.
• Connection frames 10 are also configured to ensure the supply of the different phases via supply terminals 12, one supply terminal 12 per phase.
• the position of the supply terminals 12 is represented schematically by hexagons referenced 12u, 12v and 12w.
• FIG. 7 notably represents a first layer c1 of connection frames associated with the connections of the coils of a first phase.
• the first layer c1 comprises four connection frames denoted 10a, 10b, 10c and 10d as represented in FIG. 8.
• Each connection frame 10a, 10b, 10c, 10d is made in the form of an arc of a circle whose ends connect two coils of the first phase.
• Figure 7 also shows connection frames of other layers which will be described in more detail later.
• the supply direction of one of the phases is reversed by compared to the other two phases.
• inversion of the supply direction it is meant that the supply inputs and outputs are reversed.
• the supply direction can be reversed by reversing the winding direction of the winding associated with this phase.
• connection frame 9 represents in particular a second layer c2 of connection frames 10 associated with the connections of the coils 5 of a second phase.
• the second layer c2 comprises four connection frames denoted 10e, 10f, 10g and 10h as represented in FIG. 10.
• Each connection frame 10e, 10f, 10g, 10h is produced in the form of an arc of a circle whose ends connect two coils of the second phase.
• FIG. 11 represents in particular a third layer c3 of connection frames 10 associated with a first part of the connections of the coils of a third phase.
• the third layer comprises two lead frames denoted 10i, 10j as shown in Figure 12.
• Each lead frame 10i, 10j is made in the form of an arc of a circle whose ends connect two coils of the third phase.
• FIG. 13 represents a fourth layer c4 of connecting frames 10 whose connecting frames 10u, 10v, 10w are associated with the supply terminals 12u, 12v, 12w allowing the supply of the phases as well as an associated connecting frame 10m to a first part of the inter-phase connections associated with the star connection allowing the paralleling of the first branches of each of the phases.
• the connection frames of this fourth layer c4 also appeared in FIGS. 7, 9 and 11.
• FIG. 14 notably represents a fifth layer c5 of connection frames 10.
• the connection frames 10k and 101 of this fifth layer c5 are associated with a second part of the connections of the coils 5 of the third phase and the connection frame 10n is associated to a second part of the inter-phase connections associated with the star connection allowing the paralleling of the second branches of each of the phases.
• FIG. 15 represents a superposition of the five layers c1, c2, c3, c4, c5 of connection frames 10 shown in FIGS. 8, 10, 12, 13 and 14.
• connection frames 10 therefore have a general annular shape formed by different arcs of circles and can be superimposed axially, the different ones being separated by electrically insulating interlayers to avoid any short-circuit between the different connection frames 10.
• the assembly formed by the different layers can be arranged in the center of the stator body 3, that is to say in the center of the coils 5 arranged on the stator body 3 as shown in Figures 7, 9 and 11.
• the inversion of the supply direction of one of the phases combined with the configuration of the connection frames presented in FIGS. 7 to 14 makes it possible to obtain a stator 1 whose supply terminals 12u, 12v, 12w are grouped together in an angular portion of 120° without increasing the dimensions (radial or axial) of the stator 1 .
• the 10u and 10w connection frames associated with the phases whose supply is not reversed can be extended towards the connection frame.
• 10v connection associated with the phase whose supply is reversed as shown in figure 7, 9 and 11 and the supply terminals 12u and 12w can be positioned at the end of the connection frames 10u and 10w located on the side of the frame 10v connection as shown in Figure 16.
• the present invention also relates to an electric motor comprising a stator 1 as described previously.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Windings For Motors And Generators (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=78649444

Family Applications (1)

Country Status (5)

Family Cites Families (7)

• 2021
  • 2021-09-30 FR FR2110382A patent/FR3127650A1/fr active Pending
• 2022
  • 2022-09-30 WO PCT/EP2022/077333 patent/WO2023052612A1/fr not_active Ceased
  • 2022-09-30 EP EP22793763.8A patent/EP4409732A1/de active Pending
  • 2022-09-30 US US18/697,279 patent/US20250286423A1/en active Pending
  • 2022-09-30 CN CN202280071091.0A patent/CN118140384A/zh active Pending

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