WO2019233733A1 - Rotor, machine électrique et véhicule - Google Patents

Rotor, machine électrique et véhicule Download PDF

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Publication number
WO2019233733A1
WO2019233733A1 PCT/EP2019/062714 EP2019062714W WO2019233733A1 WO 2019233733 A1 WO2019233733 A1 WO 2019233733A1 EP 2019062714 W EP2019062714 W EP 2019062714W WO 2019233733 A1 WO2019233733 A1 WO 2019233733A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
magnet
axis
air pocket
magnet installation
Prior art date
Application number
PCT/EP2019/062714
Other languages
English (en)
Inventor
Klaus Mühlbauer
Ian Hunt
Konstantina NIKOLAOU
Wilhelm Hackmann
Original Assignee
Cpt Group Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cpt Group Gmbh filed Critical Cpt Group Gmbh
Publication of WO2019233733A1 publication Critical patent/WO2019233733A1/fr

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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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • 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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • 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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • 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 disclosure relates to a rotor for an electric machine, an electric machine with the rotor and a vehicle including the electric machine.
  • An electric machine typically includes a rotor including a soft magnetic material and a stator which are separated by a gap allowing relative rotation. Electric current is passed through a coil which creates a magnetic field which interacts with the existing magnetic field causing the coil to rotate.
  • the coil may be mounted on the rotor or the stator depending on the design of the electric motor.
  • An electric machine may be used as a motor to produce rotational motion from an electrical power supply, or as a generator to produce an electric current from rotational motion .
  • the powertrain of a vehicle may include a battery alone to drive the drive train and propel the vehicle to provide a fully electric vehicle, or, in hybrid vehicles, the powertrain may include two or more energy sources, for example a combustion engine and an electric motor which may be used to drive the drivetrain and propel the vehicle.
  • the hybrid vehicle may be a parallel hybrid or a series hybrid, for example with small combustion engine to drive the drivetrain in the event that the electric source, for example battery, is depleted.
  • An electric machine in a hybrid vehicle may be used in both motor mode to drive the drivetrain and in generator mode, for example in regenerative braking, to produce an electric current which is used to charge the battery. Electric machines with a high energy efficiency, high torque and high performance and a small size are desirable for various applications including electric vehicles and hybrid vehicles.
  • a rotor for an electric machine which comprises a rotor core having an axis of rotation and a plurality of magnetic poles extending radially from the axis of rotation.
  • Each magnetic pole has a d axis which denotes the axis of magnetic flux of the magnetic pole and one or more magnet installation slots.
  • the magnet installation slot has a magnet accepting portion having a first width and at least one air pocket portion.
  • the air pocket portion has a second width that is greater than the first width of the magnet accepting portion.
  • the magnet accepting portion is used to accommodate a permanent magnet so that at least one permanent magnet is buried within each magnetic pole of the rotor core.
  • the permanent magnet may be secured within the magnet installation slot by an adhesive or mechanical clamping, for example.
  • the air pocket portion or portions are in fluid communication with the magnet accepting portion so that the air pocket portion (s) and magnet accepting portion together form a single common slot in the rotor core.
  • the air pocket portion or portions of the magnet installation slot remain unoccupied by the permanent magnet and any attachment means used to attach the permanent magnet in the magnet accepting portion of the magnet installation slot.
  • the rotor core is typically substantially cylindrical.
  • Each of the plurality of magnetic poles is substantially identical and extends radially from the axis of rotation to the outer periphery of the rotor core and, therefore, has a radial extent.
  • the rotor core also has a q axis which is positioned by an electric angle of 90° from the d axis and may be arranged between immediately adjacent magnetic poles.
  • the first width and the second width refer to the width of the magnet accepting portion and air pocket portion of the magnet installation slot in a common plane of the rotor core that is perpendicular to the axis of rotation.
  • the first width refers to the shortest distance of the magnet accepting portion in the case of an elongate form, for example a substantially rectangular or arcuate form.
  • the second width refers to the shortest distance of the air pockets portion in the case of an elongate form such as a rectangular or arcuate form.
  • the width of the air pocket portion can, therefore, be optimised independently of the width of the magnet accepting portion of the magnet installation slot. Consequently, the lateral size and shape of the air pockets as well as their position within the magnetic pole or the rotor can be optimised independently of the size, shape and position of the permanent magnets within the magnetic pole. This also enables the width of the rotor core between the magnet installation slots and between the magnet installation slots and the outer periphery of the rotor core to be optimised independently of the size and shape of the permanent magnet or magnets.
  • a rotor can be provided with the desired combination of properties, for example weight and size, me chanical strength and maximum torque, for a particular ap plication .
  • the air pocket portion may extend outwardly to a greater radial extent from the magnet accepting portion towards an outer periphery of the rotor body.
  • the air pocket portion may extend at an angle of less than 180° to the magnet accepting portion such that the magnet installation slot has a U form or a V form in plan view .
  • the magnet installation slot includes a single air pocket portion which extends from the magnet accepting portion in the radial direction towards the outer periphery of the rotor body. In other embodiments, the magnet installation slot includes two pocket portions, each extending from opposing sides of the magnet accepting portion. Each air pocket portion may extend outwardly to a greater radial extent towards the outer periphery of the rotor body.
  • the two air pocket portions associated with the common magnet accepting portion may be of differing lateral area.
  • the first one of the two air pocket portions may extend from the magnet accepting portion towards the d axis and the second of the two air pocket portions may extend radially outwards towards the outer periphery of the rotor body such that it has a distal end that is positioned at a greater radial distance from the axis of rotation that the magnet accepting portion.
  • the magnet installation slot may cross the d axis and be symmetrically arranged about the d axis of the magnetic pole.
  • the two magnet installation slots may be arranged on either side of the d axis and symmetrically about the d axis without crossing the d axis of the magnetic pole.
  • each magnetic pole of the rotor core includes two or more rows of magnet installation slots, whereby the two rows are arranged differing radial distances from the axis of rotation, of the rotor core.
  • the outermost row with respect to the axis of rotation may include a first magnet installation slot which crosses the d axis and an inner row may include two or more magnet installation slots that are arranged symmetrically about the d axis, without crossing the d axis.
  • an outer row and one or more inner rows may each include a magnet installation slot that crosses the d axis.
  • the outer and inner rows may include two or more magnet installation slots that are arranged symmetrically about the d axis without crossing the d axis.
  • the two magnet in stallation slots of a row may be arranged so as together they form a substantial V shape or U-shape in plan view.
  • the air pocket portion of a magnet in stallation slot of an inner row extends from the magnet accepting portion outwardly towards the outer periphery or circumference of the rotor by a distance such that a portion of the air pocket is arranged at the same radial distance from the axis of rotation as an air pocket portion of a magnet installation slot of the outer row .
  • the rotor core may be made from a soft magnetic material and may comprise a plurality of soft magnetic laminations or sheets arranged in a stack having a stack direction that extends parallel to the axis of rotation.
  • the soft magnetic lamination may be an iron silicon sheet, for example.
  • the laminations or sheets may be secured together by adhesive, for example, to form the rotor core .
  • the rotor includes one or more permanent magnets, whereby a permanent magnet is arranged in the magnet accepting portion of one or more of the magnet installation slots of each magnetic pole .
  • the air pocket portion is unoccupied by the permanent magnet such that the second width of the air pocket portion, which is greater than the first width of the magnet accepting portion of the magnet installation slot, is unoccupied by the permanent magnet and thus provides an air pocket.
  • the shape of the permanent magnet may correspond to the shape of the magnet accepting portion, for example bath tub or trapezoidal, or arcuate in plan view .
  • the radially inward contour of the air packet portion pocket portion is arranged at a greater radial distance from the axis of rotation compared to a radial distance of a radially inward contour of the permanent magnet.
  • a radially inward long side of the air pocket is arranged at a greater radial distance from the axis of rotation compared to a radial distance of a radially inward long side of the permanent magnet.
  • the permanent magnet can be considered to be radially offset inwardly towards the axis of rotation with respect to the air pocket.
  • the invention also provides an electric machine, which may be operated as a motor or a generator, the electric machine comprising a stator and the rotor of any one of the embodiments described herein.
  • the invention also provides a vehicle comprising an electric powertrain, or hybrid powertrain, whereby the powertrain comprises the electric machine including the rotor of any one of the embodiments described herein.
  • the powertrain of the vehicle includes a power source, which may be a source of electricity, for example a battery in the case of an electrically drive powertrain, or a battery and a combustion engine in the case of a series hybrid or a parallel hybrid vehicle.
  • the rotor according to the invention provides high performance and high torque with high energy efficiency.
  • the topology maximises the reluctance torque component and ensures that the maximum torque can be generated with minimum phase current without compromising the machine's maximum power capability.
  • the magnetic volume is minimised whilst ensuring robustness against the magnetisation and low resulting current during active short-circuit as well as fulfilling the mechanical stability of the rotor up to the maximum allowed speed, including over-speed conditions .
  • the rotor may be used in a 48 V starter generator, a 48 V electric traction drive with high power and high energy efficiency for hybrid vehicles, small electric vehicles, plug-in hybrid electric vehicles or robot vehicles, such as people movers .
  • Figure 1 illustrates a schematic view of an exemplary electric machine with a rotor and a stator.
  • Figure 2a illustrates a view of a magnetic pole of a rotor for an electric machine according to a first embodiment.
  • Figure 2b illustrates a view of the magnetic pole of figure 2a with permanent magnets inserted in the rotor.
  • Figure 3 illustrates a view of a magnetic pole of a rotor for an electric machine according to a second embodiment.
  • Figure 4 illustrates a view of a magnetic pole of a rotor for electric machine according to a third embodiment.
  • Figure 5 illustrates a schematic view of a vehicle including an electric machine with a rotor according to any one of the embodiments described herein.
  • Figure 1 illustrates a schematic view of an exemplary electric machine 2 including a rotor 4 and a stator 6.
  • the rotor 4 has a rotor core 8 having an axis of rotation 10 and a plurality of magnetic poles 12 which extend radially from the axis of rotation 10.
  • the rotor 4 is arranged concentrically within the stator 6 and has a circumference or an outer periphery 14 that is spaced apart from an inner periphery 16 of the stator 6 by an air gap 18.
  • the stator 6 has one or more windings 20 through which current can flow to produce a magnetic field.
  • the rotor 4 has a plurality of magnetic poles 12 which are substantially identical. Eight magnetic poles 12 are illustrated in Figure 1. However, the rotor is not limited to including eight magnetic poles and may include more or less than eight magnetic poles .
  • Each magnetic pole 12 includes one or more slots 22 in which a permanent magnet 24 is situated. The slots 22 may be called magnet installation slots or magnet insertion slots.
  • Each of the magnetic poles 12 of the rotor core 8 includes an axis denoted as the d axis.
  • the d axis denotes the axis of magnetic flux for the permanent magnet or magnets 24 of each magnetic pole 12 and in some embodiments can be a centre axis of the magnetic pole 12.
  • the rotor 4 also has a q axis which is deviated from the d axis by an electrical angle of 90°.
  • Each magnetic pole 12 has substantially the same topology and, therefore, the same number, shape and position of the permanent magnets 24 and associated slots 22.
  • the electric machine 2 may be used as in a motor or generator mode .
  • the rotor core 8 includes a soft magnetic material and, in some embodiments, may be formed in by a stack of soft magnetic laminations or sheets having a stack direction which extends parallel to the axis of rotation 10 and, therefore, out of the plane of the drawing.
  • the laminations may be secured to one another, for example by an adhesive, to form the rotor core 8.
  • the arrangement of the magnet installation slot or slots 22 and therefore, the permanent magnets 24, within each magnetic pole 12 of the rotor core 8 can be selected and designed to improve the power density and torque produced by the electric machine 2.
  • Figures 2 to 4 illustrate embodiments and such arrangements for a single magnetic pole 12 of the rotor 4 and, in particular, illustrate embodiments of the magnet installation slots 22 in the rotor body 8 of the rotor 4. It is to be understood that each of the further magnetic poles of the rotor has the same arrangement. However, the rotor according to any one of the embodiments described herein is not limited to use in an electric machine having the design illustrated in Figure 1.
  • Figure 2a illustrates a view of one magnetic pole 12 of a plurality of substantially identical magnetic poles of a rotor core 8 according to a first embodiment.
  • the rotor core 8 may be used in an electric machine, such as that illustrated in figure 1.
  • Each magnetic pole 12 includes three magnet installation slots 26, 28, 30.
  • Figure 2b illustrates a view of the magnetic pole 12 of the rotor core 8 with a permanent magnet 32, 34, 36 inserted in each of the magnet installation slots 26, 28, 30.
  • the magnetic pole 12 includes two rows 38, 40 of magnet installation slots.
  • a first outer row 38 is positioned radially outwardly of a second inner row 40 with respect to the axis of rotation 10.
  • a single magnet installation slot 26 is arranged in the outer row 38 which crosses the d axis and is arranged mirror symmetrically about the d axis.
  • the second row 40 includes two magnet installation slots 28, 30 which are arranged symmetrically about and on either side of the d axis such that the magnet installation slots 28, 30 are spaced apart by a portion of the rotor body 8 at the d axis so that neither of the magnet installation slots 28, 30 crosses the d axis.
  • the magnet installation slot 26 of the outer row 38 includes a central magnet accepting or accommodation portion 42, which extends into a first air pocket 44 and a second air pocket 46 at opposing ends so that the air pockets 44, 46 are in fluid communication with the magnet accepting portion 42 and form a single slot or recess within the rotor core 8.
  • the magnet accepting portion 42 has a width W1 and the each of the air pockets 44, 46 has a width W2.
  • the width W2 of the air pockets 44, 46 is greater than the width W1 of the magnet accepting portion 42.
  • the magnet accepting portion 42 may be substantially straight and have a bathtub form.
  • the air pockets 44, 46 extend outwardly from the magnet accepting portion 42 towards the circumference 14 of the rotor body 8 to a greater radial extent than the magnet accepting portion 42 and form an angle (alpha) of less than 180° to the magnet accepting portion such that the magnet installation slot 26 can be considered to have a U-shaped form.
  • the distal ends of the air pockets 44, 46 may be rounded.
  • the air pockets 44, 46 have the same lateral size.
  • the magnet installation slots 28, 30 of the second row 40 have a mirror symmetrical arrangement about the d axis.
  • the magnet installation slot 28 also includes a central magnet accepting portion 48 which extends into first air pocket 50 and a second air pocket 52 at opposing ends, whereby the first air pocket 50 extends towards the q axis and the second air pocket 52 extends towards the d axis.
  • the magnet accepting portion 48 may be arranged at an inclined angle to the d axis which is less than 180° but more than 90°.
  • the two magnet installation slots 28, 30 may together form a V-shape or a U shape. In this embodiment, the magnet accepting portion 48 is straight rather than curved so that a V-shape is formed.
  • the air pockets 50, 52 of the magnet installation slot 28 have differing lateral areas.
  • the first air pocket 50 has a larger lateral area than the second air pocket 52.
  • the first air pocket 50 extends from the magnet accepting portion 48 radially outwardly towards the circumference 14 of the rotor body 8.
  • the first air pocket 50 has a length L2 such that a distal end of the first air pocket 50 is arranged at a radial distance from the axis of rotation 10 on which the air pockets 44, 46 of the magnet installation slot 26 of the outer row 38 are also positioned.
  • the second magnet installation slot 30 of the inner row 40 also includes a magnet accepting portion 48' with first and second air pockets 50' , 52' .
  • the second magnet installation slot is a mirror image about the d axis of the first magnet installation slot 28 and is also mirror symmetrically arranged about the d axis with respect to the first magnet installation slot 28.
  • the permanent magnets 32, 34, 36 have a lateral size and shape such that they can be accommodated in the magnetic accepting portion of the respective magnet in stallation slot 26, 28, 30.
  • the permanent magnets 32, 34, 36 may be secured in the magnet accepting portion 42, 48, 48' of the respective magnet installation slot 26, 28, 30 by an adhesive or by clamping, for example.
  • the magnet accepting portions 42, 48, 48' of the magnet installation slots 26, 28, 30 each have a lateral size such that, when the permanent magnet is positioned in the magnet accepting portion 42, 48, 48' , the air pockets 44 , 46, 50, 52, 50', 52' of the magnet installation slots 26, 28, 30 remain unoccupied by the respective permanent magnets 32, 34, 36.
  • the permanent magnets 32, 34, 36 can be considered to be offset radially inward from the air pockets 44, 46, 50, 52, 50', 52' of the respective magnet installation slot 26, 28, 30 such that at the transition between the permanent magnet 32 and the air pockets 44, 46, the contour of the radially inward side of the air pockets 44, 46 is arranged at a greater radial distance from the axis of rotation 10 compared to a radial distance of radially inward contour of the permanent magnet 32 from the axis of rotation 10.
  • An inwardly facing long side of the permanent magnet 32 is positioned at a smaller radial distance from the axis of the rotation 10 compared to the radial distance from the axis of rotation of the most inwardly positioned long side of the air pocket 44, 46.
  • the two layer design as illustrated in Figure 2 may be considered to be based on a bathtub design, with two V orientated magnet air pockets in the inner layer. All of the magnets are offset towards the inner radius, or axis of rotation, relative to the pattern of the air gap of the machine.
  • the bridges formed by the material of the rotor next to the air gap of the machine are relatively large which, however, are not reduced significantly due to the layout of the air pockets and their rounded contour and enhance the mechanical stability of the rotor.
  • the pattern of the air pockets is such that the air pocket has a width which is not the same width as the magnets and is not the same as the magnet accepting portion of the magnet installation slot. The width of the air gap is enlarged to the magnets and the magnet accepting portion in order to increase the magnetic resistance for the electromagnetic flux.
  • the topology of the rotor 4 with the permanent magnets in position in the magnet accepting portions of the slots may be used in an electric machine to maximise the reluctance torque component and ensure that the maximum torque can be generated with minimum phase current without compromising the machine's maximum power ca pability.
  • the magnetic volume is minimised whilst ensuring robustness against the magnetisation and low resulting current during active short-circuit as well as fulfilling the mechanical stability of the rotor up to the maximum allowed speed, including over-speed conditions.
  • At least one of the magnet installation slots of a magnetic pole of the rotor has an air pocket portion extending from a magnet accepting portion, or two air pocket portions extending from opposing ends of a magnet accepting portion, which have a second width which is greater than the first width of the magnet accepting portion.
  • the first width and the second width lie in a common lateral plane of the rotor core, for example, at the surface of the rotor core.
  • the second width of the air pocket is the smallest dimension of the pocket which is unoccupied by the permanent magnet.
  • the air pockets extend in a general radial direction outwardly from the permanent magnet and the magnet accepting portion of the slot towards the outer periphery of the rotor body.
  • the magnet installation slots of the rotor may have forms other than that illustrated in figure 2 and may be arranged in a single row or three or more rows, for example as illustrated in Figures 3 and 4.
  • FIG 3 illustrates a view of a magnetic pole 12' of a rotor 4' for an electric machine according to a second embodiment.
  • each magnetic pole 12' includes a single magnet installation slot 26' which extends across and is symmetrical about the d axis.
  • the magnet installation slot 26' has a central magnet accepting portion 42' and extends into an air pocket 44', 46' at opposing ends.
  • the magnet accepting portion 42' has a curved or arcuate shape having a width W1 which is less than the width W2 of each of the air pockets 44', 46' .
  • the non illustrated permanent magnet which is to be secured in the magnet accepting portion 42' has a shape and size corresponding to the magnet accepting portion and is also arcuate .
  • one or more further rows of magnet installation slots and their associated permanent magnets may be included, each of which has a form similar to that as the magnet installation slot 26', which are arranged radially inward of the magnet installation slot 26' and symmetrically about the d axis.
  • Each of the magnet installation slots may cross the d axis.
  • FIG 4 illustrates a view of a magnetic pole 12' ' of a rotor 4' ' for electric machine according to a third embodiment.
  • each magnetic pole 12' ' includes three rows 56, 58, 60 of magnet installation slots.
  • the outer row 56 may include a magnet installation slot 26 as in the embodiment illustrated in figure 3 or in figure 2a.
  • the two inner rows 58, 60 may each include two magnet installation slots 62, 64, 66, 68.
  • the two magnet installation slots 62, 64 of the row 58 are arranged mirror symmetrically about the d axis such that each magnet installation slot 62, 64 does not cross the d axis.
  • the magnet installation slots 66, 68 of the third row 60 may have a similar arrangement so that the two magnet installation slots 66, 68 of the third row 60 are arranged mirror symmetrically about the d axis such that each magnet installation slot 66, 68 does not cross the d axis.
  • the distance between the rows 56, 58, 60 may be the same or may be different.
  • Each of the magnet installation slots 26, 62, 64, 66, 68 includes a central magnet accepting portion 70 which extends into an air pocket 72, 74 at opposing ends of the magnet accepting portion 70.
  • Each of the air pockets 72, 74 has a width W2 which is greater than the width W1 of the magnet accepting portion 70.
  • all of the magnet installation slots are sub stantially arcuate.
  • different forms may be used within a magnetic pole.
  • the magnet installation slot of the outermost row with respect to he axis of rotation may have a bath tub or trapezoidal form and the magnet installation slots of the inner rows with respect to the axis of rotation may be sub stantially arcuate.
  • FIG. 5 illustrates a schematic view of a vehicle 100 including one or more electric machines 104 having the rotor according to any one of the embodiments described herein.
  • the vehicle 100 includes one or more power sources such as a battery 102 which supply current to the electric motor 104.
  • the electric machine 104 may be used to drive the drivetrain 106 and therefore the wheels 110 of the vehicle 102 to propel the vehicle 100.
  • the vehicle 100 may be an electric vehicle including only a single power source 102, for example in the form of a battery.
  • the electric machine 104 alone is used to propel the vehicle.
  • the vehicle 100 is a hybrid vehicle including two power differing power sources, for example a battery 102 and a combustion engine 108.
  • the combustion engine 108 may be used alone to propel the vehicle 100 or may be used together with the electric motor to propel the vehicle.
  • the combustion engine 108 may be used to provide rotational me chanical energy to the electric machine 104 which is used in a generator mode to charge the battery 104.
  • the electric machine 104 is not limited to being used as part of the drivetrain of a vehicle.
  • the electric machine 104 may also be used as a starter motor for vehicle 100.
  • the rotor design of the embodiments described herein may be considered to be based on a bathtub design, with two V or U orientated magnet air pockets in an inner layer. All of the magnets are offset towards the inner radius, or axis of rotation, relative to the pattern of the air gap.
  • the bridges formed by the material of the rotor next to the air gap of the machine are relatively large which, in the topology according to the em bodiments described herein, does not reduce the due to the layout of the air pockets and rounded contour significantly but enhances the mechanical stability of the rotor.
  • the pattern of the air pockets is such that the air pocket has a width which is not the same width as the magnets and the magnet accepting portion of the magnet installation slot. In particular, the width of the air gap is enlarged to the magnets in order to increase the magnetic resistance for the electromagnetic flux.
  • the electric machine including the rotor with permanent magnets may be used to generate a torque based on the permanent magnetic flux from the magnets and the reluctance of the motor.
  • the topology of the rotor is a result of a multifunctional opti misation which may include considering the following parameters: maximising shaft torque, maximising shaft power, minimising phase current, minimising current ripple, minimising torque ripple, minimising loss, minimising magnet volume whilst en suring robustness against the magnetisation and guaranteeing mechanical stability over the operating range.
  • the rotor may be used to produce a high power density and enhance energy efficiency.
  • the rotor may be used in applications such as low-voltage, high-voltage and 48 voltage power supplies, hybrid and electrically driven vehicles, plug-in hybrid electric vehicles and electric machines, such as a permanent magnet synchronous machine.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

Dans un mode de réalisation, l'invention concerne un rotor (4) pour une machine électrique (2) comprenant un noyau de rotor (8) ayant un axe de rotation (10) et une pluralité de pôles magnétiques (12) s'étendant radialement à partir de l'axe de rotation (10), chaque pôle magnétique (12) ayant un axe désigné comme un axe d et au moins une fente d'installation d'aimant (26). La fente d'installation d'aimant (26) comprend une partie d'acceptation d'aimant (42) ayant une première largeur (W1) et au moins une partie de poche d'air (44, 46). La partie de poche d'air (44, 46) a une seconde largeur (W2) qui est supérieure à la première largeur (W1) de la partie d'acceptation d'aimant (42).
PCT/EP2019/062714 2018-06-07 2019-05-16 Rotor, machine électrique et véhicule WO2019233733A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1809346.8 2018-06-07
GB1809346.8A GB2574450A (en) 2018-06-07 2018-06-07 Rotor, electric machine and vehicle

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Publication Number Publication Date
WO2019233733A1 true WO2019233733A1 (fr) 2019-12-12

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PCT/EP2019/062714 WO2019233733A1 (fr) 2018-06-07 2019-05-16 Rotor, machine électrique et véhicule

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WO (1) WO2019233733A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112928842A (zh) * 2021-01-28 2021-06-08 重庆长安新能源汽车科技有限公司 一种转子冲片、转子、永磁同步电机及车辆
WO2022110865A1 (fr) * 2020-11-30 2022-06-02 珠海格力电器股份有限公司 Rotor de moteur, moteur à aimants permanents et véhicule électrique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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