Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
  • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
  • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
• • 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
  • H02K1/14—Stator cores with salient poles
  • H02K1/141—Stator cores with salient poles consisting of C-shaped cores
• • 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
  • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
• • 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
  • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
  • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K2211/00—Specific aspects not provided for in the other groups of this subclass relating to measuring or protective devices or electric components
  • H02K2211/03—Machines characterised by circuit boards, e.g. pcb
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
  • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

• the present invention relates to a two-phase brushless electric motor, in particular a motor integrated into a mechatronic system.
• the invention relates to automotive peripherals with very limited space requirements, such as expansion valves or the actuation of air flow switching flaps of an air conditioning module.
• Such an example of a motor is described by patent FR2742940B1 of the applicant, proposing such a two-phase motor constituted by a stator part excited by two electric coils and by a magnetized rotor having N pairs of poles magnetized radially in alternating directions, N being equal to 3 or 5.
• the stator part has at least two W-shaped circuits each comprising an electric coil surrounding the central leg. The W circuits are arranged so that when one of the central legs is facing a magnetic transition, the other central leg is facing a magnetic pole.
• the needle valve described in patent EP2484948A1 comprises a housing formed with a first orifice communicating with one end part of a cylindrical communication hole, and a second orifice communicating with the other end part of the communication hole; a needle valve stem which is movably mounted in an axial direction in the communication hole, and which is formed with a tapered part whose outer diameter has changed in a direction from one end part side toward the other end part side of the communication hole, and a space between the conical part and a valve seat surface of the communication hole is changed according to a position thereof in the axial position.
• Patent US2017338113 describes a motor comprising a stator and a rotor rotatably arranged in the stator, the rotor comprising a rotary shaft and a gearbox driven by the motor, the gearbox comprising a casing in which the motor is mounted, and a gear mounted on the housing and driven by the rotating shaft of the motor, two first bearings mounted in the housing on the same side of the stator to support the rotating shaft and allow the stator to pivot relative to the housing.
• stator is constituted by a rotor and a stator, the stator being constituted by a stack of cut ferromagnetic sheets having two teeth each extending along a median radial axis, said median radial axes being coplanar, the transverse section of the stator fitting into a rectangle of length and width , each of said teeth being surrounded by a coil, the rotor comprising 3, 4 or 5 pairs of magnetic poles magnetized radially, in alternating directions, characterized in that said median radial axes form between them an angular sector extending over an angle comprised between plus 145° and less than 180° and in this said stator has at least one mechanical and magnetic continuity, extending between the two wound teeth.
• the object of the present invention may also have one or a compatible combination of the following characteristics.
• said median radial axes form an angle between them such that the two coils are electrically out of phase by 120°.
• said yoke has a second mechanical and magnetic continuity, one or the other of the mechanical and magnetic continuities forming at least one continuous unwound tooth, said first and second mechanical and magnetic continuities extending on both sides. other of said rotor between the two wound teeth, said first and second mechanical and magnetic continuities being of different angular widths.
• the median radial axis of each of the unwound continuous tooth(s) can be located equidistant from the median radial axes.
• said mechanical and magnetic continuity forming two unwound teeth is located in the least extensive angular sector separating the median radial axes.
• said cylinder head has a discontinuity extending between the two wound teeth on the side opposite to said mechanical and magnetic continuity.
• the ratio between the diameter D of the rotor and the length is greater than 50%.
• the ratio between the width and the length of the outer casing of the stator is between 0.4 and 0.6.
• the ratio between the width and the length of the outer casing of the stator is between 0.4 and 0.5.
• the rotor is coupled to an endless screw constituting the first module of a movement transformation.
• said movement transformation is of the rotary-linear type and controls the linear movement of an output member.
• said organ is a needle.
• said motion transformation is a linear displacement collinear with the axis of the rotor.
• said movement transformation is of the rotary-rotary type controls the rotation of an output shaft.
• said output shaft is oriented in a direction perpendicular to the direction of the axis of said rotor.
• the invention also relates to a mechatronic system comprising a brushless electric motor and a substantially parallelepiped housing characterized in that the motor conforms to one of the preceding variants and in that the axis of the rotor is oriented along the long length d 'a parallelepiped envelope delimiting the case.
• the mechatronic system comprises a printed circuit arranged between said motor and said housing, the face of the motor printed circuit having a connector passing through a cutout provided in the transverse face of said housing.
• the aim of the invention is to propose a two-phase electric motor that is easy to manufacture industrially, efficient and compact. It relates in particular to a motor having a form factor perpendicular to the axis of rotation of the rotor optimized to allow integration into a compact housing with positioning of the axis of the rotor perpendicular to the transverse sectional plane of the housing.
• the form factor sought for optimal integration of the motor in the actuator housing involves, in the transverse section of the motor (orthogonal to its axis of rotation) a dimension along one axis much smaller than the dimension along the other axis, resulting in rather elongated motors with a substantially tubular envelope, but distinguished from the elongated motors of the prior art by an orthogonal axis of rotation of the rotor to the long length of said envelope and located near the middle along this long length.
• the width of the motor designates the smallest dimension of the motor of the transverse section
• the length designates the largest dimension of the motor of the transverse section
• the thickness designates the dimension in the direction orthogonal to the transverse section .
• the plane of the stator perpendicular to the axis of rotation is inscribed in the smallest section of the actuator.
• the motor according to the invention comprises a stator having only two wound teeth, the first carrying a first coil powered by a first phase, and the second carrying a second coil powered by the opposite phase of the two-phase power supply.
• the angle formed between the median radial axes of the two teeth is between 155 and 150° when the rotor has 4 pairs of poles, or between 160° and 165° when the rotor has 5 pairs of poles, or even an angle such that the two coils are electrically phase shifted by 120°.
• the two-phase electric motor (1) comprises a rotor (10) and a stator (20) provided with two coils (31, 32) each connected to a different electrical phase powering said two-phase motor.
• the stator (20) is formed by a stack of thin ferromagnetic sheets all having the same cutout, symmetrical with respect to a transverse median plane P. Said sheets, seen in the lamination plane, are provided with a peripheral belt (40) closed, fitting into a rectangular envelope (50) of length and width , and have cutouts to form two teeth (21, 22) intended to carry the two electric coils (31, 32).
• teeth (21, 22) are oriented radially relative to the rotor (10) and extend along two axes ( ) coplanars separated angularly by an angle greater than 145°, so as to form two angular sectors ( ) complementary.
• the teeth (21, 22) are connected by a peripheral belt so as to ensure at least mechanical and magnetic continuity (41, 42) between the teeth (21, 22).
• the angular separation of the wound teeth (21, 22), at a very open angle, makes it possible to minimize the radial bulk of the stator in the angular sectors ( ) within which the cutting of the sheets is refined to the strict extent necessary to ensure a good magnetic connection with the rotor and guarantee the good mechanical strength of the stator assembly.
• a sheet lamination plan a plane orthogonal to the thickness of the sheet, i.e. the smallest dimension of the sheet before any cuts.
• the sheets are stacked in a direction orthogonal to this plane to form a sheet pack.
• the rotor (10) has a diameter D, and is inscribed in the rectangular envelope (50) of the stator sheets so that the ratio between the diameter of the rotor and the width of the stator is greater than 50%.
• the rotor has N magnetized poles (11, 12), with N being 6, 8 or 10, distributed on its periphery in alternating directions, to form North poles (11) and South poles (12).
• Said poles are preferably made in a monolithic magnet ring overmolded on a cylindrical core, but could alternatively be obtained by any other technique known to those skilled in the art, such as driving out a ring, gluing magnetic tiles or even , in a non-limiting manner, by the magnetization of an injected magnet constituting a monolithic rotor.
• the length of the wound teeth (21, 22) is chosen judiciously to be compatible with a production of the electrical coils (32, 32) on coil bodies, which are then inserted onto the teeth (21, 22) of the sheet pack passing through by the internal space, cleared to accommodate the rotor (10).
• the length of the wound teeth (21, 22) must therefore be less than the rotor diameter, , increased by twice the magnetic air gap, , which corresponds to the difference between the tooth front (21, 22) and the outer periphery of the rotor.
• Figure 1 illustrates a first alternative embodiment according to the invention provided with a rotor with 8 magnetic poles (11, 12).
• the axes ( ) of the wound teeth (21, 22) are angularly separated by 157.5° which is the most open angle making it possible to obtain perfect magnetic quadrature between the wound teeth (21, 22).
• the wound teeth (21, 22) are connected by mechanical and magnetic continuities (41, 42) in each of the angular sectors ( ), including the section, , i.e.
• the thickness in the lamination plane of the sheets must be sufficient to ensure the passage of the magnetic flux without saturation, it is therefore equivalent to half the width of the wound teeth (21, 22). This constraint defines the maximum size of the stator and therefore the length and the width of the rectangular envelope (50).
• the mechanical and magnetic continuities (41, 42) each have a protrusion extending towards the rotor to form an unwound tooth (23, 24) very flared, said non-wound teeth (23, 24) expanding angularly over the majority of the angular sectors ( ), leaving only the necessary space for the notches accommodating the electrical coils (31, 32) supported by the teeth (21, 22).
• the angular sectors ( ) being of different widths, the fronts of the non-wound teeth (23, 24) extend over different angular extents but greater than 60°, the wound teeth (21, 22) rather presenting a tooth front spreading over a angle of 20°.
• the two-phase motor thus produced has a quasi-smooth air gap and notched only around the teeth (21, 22) to accommodate the coils (31, 32).
• this wide tooth configuration makes it possible to notch the outer periphery of the magnetic and mechanical continuity (240) located in the angular sector ( the most closed.
• the notches (43, 44) thus created ensure the fixing of the stator (20) without extending beyond the rectangular envelope (50) and while leaving a sufficient section for the passage of magnetic flux through the magnetic continuity and mechanics (41).
• the angular sector ( , the most open, offers more space to ensure mechanical strength without overflowing from the rectangular envelope (50), the second magnetic and mechanical continuity (42) can therefore have a larger section to be provided with drilling (47, 48 ) in order to ensure very precise positioning of the stator and its maintenance, while providing a sufficient magnetic flux passage section.
• Figure 2 illustrates a second alternative embodiment according to the invention. It differs from the previous embodiment in that the rotor is provided with 10 magnetic poles (11, 12). In order to keep the teeth (21, 22) wound in phase quadrature, the angle located between the axes ( ) is brought to 162°. This configuration makes it possible to obtain an even flatter engine than the version illustrated in with 8 magnetic poles (11, 12).
• Figure 3 illustrates a third alternative embodiment according to the invention. It differs from the embodiment presented in Figure 1 in that the angular sector ( ) the most open is devoid of magnetic and mechanical continuity (42), but has two extensions (42a, 42b) of the peripheral belt (40), separated by a clearance (49) making it possible to ensure a looping of the magnetic flux between the wound teeth (21, 22) and the rotor (10), each of these extensions being terminated by an unwound tooth (27, 28),
• This configuration is also interesting in that the clearance (49) of the peripheral belt (40) located in the angular sector ( ) the most open can be used to house a sensitive magneto probe making it possible to obtain, for example, position or cadence information from the rotor (10).
• Figure 4 illustrates a fourth alternative embodiment according to the invention. It differs from the previous embodiment, presented in Figure 3, in that the peripheral belt (40) is closed between the teeth (27, 28) by magnetic and mechanical continuity (42) and in that the magnetic and mechanical continuity (41) of the angular sector ( ) the most closed, is also provided with two teeth (25, 26).
• This configuration is advantageous when one wants to precisely adjust the torque without current, because it leaves several degrees of freedom on the width of the unwound teeth (25, 26, 27, 28) and their positioning relative to the tooth ( 21, 22) adjacent wound.
• the symmetry of the stator (20) with respect to the plane P is preserved, but the angular deviation ( ) formed between the median axis of a tooth (25, 26) of the angular sector ( ) the more closed and the central axis of the adjacent wound tooth is different from the angular deviation ( ) formed between the median axis of a tooth (27, 28) of the angular sector ( ) the most open and the central axis of the adjacent coiled tooth.
• the angular deviation ( ) is 45°, while the angular deviation ( ) is 55°.
• Angular deviations ( ) optimal depend directly on the polarity of the rotor, but we will retain as a general rule that one of these angles must be less than or equal to 45°, the other must be greater than 45°.
• the electric motor (1) according to the invention is associated with a movement reduction train (120), the whole being integrated into a housing (100) to form a very compact actuator intended to motorize, for example, air conditioning shutters.
• a movement reduction train (120) for which the upper cover (101) of the housing has been removed, the illustrates a side sectional view of the actuator at the output of the electric motor and parallel to the lamination plane of the stator sheets (20), and the illustrates a view in a longitudinal section, of the housing only, along the broken axis AA', which makes it possible to appreciate the positioning of the stator (20) and the guidance of several mobiles of the reducer.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Iron Core Of Rotating Electric Machines (AREA)
• Permanent Magnet Type Synchronous Machine (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=85122073

Family Applications (1)

Country Status (6)

Family Cites Families (11)

• 2022
  • 2022-11-30 FR FR2212543A patent/FR3142626A1/fr active Pending
• 2023
  • 2023-11-29 JP JP2025531282A patent/JP2025537409A/ja active Pending
  • 2023-11-29 EP EP23814456.2A patent/EP4627697A1/de active Pending
  • 2023-11-29 CN CN202380082187.1A patent/CN120380683A/zh active Pending
  • 2023-11-29 WO PCT/EP2023/083616 patent/WO2024115606A1/fr not_active Ceased
  • 2023-11-29 KR KR1020257019698A patent/KR20250116663A/ko active Pending

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