WO2013014071A2 - Moteur électrique doté d'un aimant lié à la position de rotor - Google Patents

Moteur électrique doté d'un aimant lié à la position de rotor Download PDF

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Publication number
WO2013014071A2
WO2013014071A2 PCT/EP2012/064257 EP2012064257W WO2013014071A2 WO 2013014071 A2 WO2013014071 A2 WO 2013014071A2 EP 2012064257 W EP2012064257 W EP 2012064257W WO 2013014071 A2 WO2013014071 A2 WO 2013014071A2
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
electric motor
motor shaft
recess
rotor
Prior art date
Application number
PCT/EP2012/064257
Other languages
German (de)
English (en)
Other versions
WO2013014071A3 (fr
Inventor
Antoine Chabaud
Eberhard Lung
Torsten Henke
Jochen Geissler
Bruno Holzwarth
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2013014071A2 publication Critical patent/WO2013014071A2/fr
Publication of WO2013014071A3 publication Critical patent/WO2013014071A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors
    • 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
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements

Definitions

  • the invention relates to an electric motor, in particular an electronically commutated electric motor.
  • the electric motor has a particular permanent magnetic trained rotor.
  • the electric motor also has a rotor position sensor, which is formed, a rotor position of the rotor in
  • the holder is designed for example as a plastic or steel piece, which is attached to one end of the motor shaft.
  • the permanent magnet is cast in the plastic piece or connected thereto. Disclosure of the invention
  • the permanent magnet is at least partially disposed in the recess.
  • the motor shaft is preferably formed in one piece.
  • the holder for the permanent magnet, in particular a spacer, an intermediate piece or the aforementioned cup can be saved.
  • the perma Magnet are rotatably connected to the motor shaft in a predetermined position and a predetermined magnetic orientation.
  • Permanent magnet is connected by means of a spacer or an attached plastic piece of fabric with the motor shaft, must in a subsequent
  • Step 2 the rotor magnetization be calibrated in the case of a permanent magnetic rotor formed relative to the orientation of the permanent magnet to set a rotor position of the electric motor for rotor position determination by a control unit.
  • This calibration step can advantageously be dispensed with in the case of the embodiment of the electric motor according to the invention.
  • the electric motor has a control unit, which is connected to a stator of the electric motor and designed to energize the stator in response to the rotor position signal of the rotor position sensor for generating a magnetic rotating field.
  • the permanent magnet is by means of a
  • the electric motor can advantageously be provided at low cost.
  • the adhesive has spacer particles, each with a diameter, wherein the spacer particles are each formed between the permanent magnet and a wall of the recess one
  • an adhesive in a liquid, in particular viscous or pasty state, together with the spacer particles, which preferably have a firm consistency at a processing temperature of the adhesive, can be advantageously used by the spacer particles, wherein the spacer particles have a predetermined distance which corresponds to the diameter of the spacer particles corresponds between the wall and the permanent magnet.
  • the spacer particles and / or the adhesive are preferably non-magnetizable.
  • a magnetic permeability of the adhesive and / or the spacer particles corresponds to a permeability of air.
  • a permeability of the adhesive and / or the spacing particles which corresponds to a permeability of a diamagnetic substance.
  • the non-magnetizable property of the spacer particles and / or the adhesive advantageously ensures that a magnetic field, in particular an orientation of a total magnetic field generated by the permanent magnet, is determined by the permanent magnet itself, in particular its orientation, and not in addition changed by the motor shaft.
  • the gap between the permanent magnet and the motor shaft, in particular the wall of the recess of the motor shaft, thus generated by means of the spacer particles and the adhesive thus causes magnetic field lines of the magnetic field of the permanent magnet not or at least to a reduced extent in comparison to a wall of the Not spaced arrangement arrangement of the permanent magnet, extending into the motor shaft and so the magnetic field of the permanent magnet is codetermined by the motor shaft or changed.
  • the permanent magnet is at least partially surrounded by a plastic layer. It is conceivable, for example, a permanent immersed in a liquid plastic, in particular a neodymium magnet.
  • the permanent magnet is at least partially, in particular on a longitudinal portion, with which the permanent magnet is arranged in the recess, surrounded by a plastic cup or a plastic channel. More preferably, the permanent magnet is with the
  • the permanent magnet can be inserted, for example, into a plastic cup before being inserted into the recess.
  • the permanent magnet then protrudes with a longitudinal section out of the Kunststoffbe- 5 or the plastic cup is flush with a front side of the
  • the permanent magnet is then then inserted together with the plastic cup in the recess or pressed into it.
  • the plastic of the plastic cup or the plastic layer is formed for example by a thermoset, a thermoplastic, in particular polyethylene, ethylene, polypropylene, polyacrylic, polyamide, or polyimide.
  • the permanent magnet is held in the recess by means of a spring, for example a spring made of non-magnetizable, in particular diamagnetic metal.
  • the spring is formed for example by a sheet metal spring.
  • the sheet metal spring preferably has at least one Leaf spring with a free end or with two molded on the sheet ends.
  • the metal is for example stainless steel, brass, copper or aluminum.
  • the rotor position sensor is a magnetoresistive sensor.
  • TMR Tunnel Magneto-Resistive
  • CMR Colossal Magneto-Resistive
  • the permanent magnet protrudes beyond an end of the motor shaft along a motor shaft longitudinal axis.
  • a magnetic field which has a linear alignment, at least in a plan view, on the end face of the motor shaft.
  • the recess in which the permanent magnet is inserted angephast.
  • an edge which extends between the end face and the wall of the recess bevelled.
  • the recess in the region of the end is funnel-shaped or pointed cone-shaped. More preferably, the funnel-shaped recess opens in the region of a tip of the funnel or seat cone in a longitudinal portion of the recess, which corresponds to the shape of L Lucassabschnit- 5 tes of the permanent magnet, which is inserted into the longitudinal portion of the recess and is held in this.
  • the section of the permanent magnet projecting beyond the recess in particular the previously described inner part of the recess into the funnel-shaped or conical recess, can advantageously send out field lines into the funnel-shaped region.
  • the permanent magnet may thus be largely or completely received in the end portion of the motor shaft.
  • the permanent magnet is received in the end portion of the motor shaft such that one end of the permanent magnet does not protrude beyond an end of the motor shaft, in particular the funnel described above.
  • the permanent magnet is arranged in the recess such that a magnetic field of the permanent magnet extends transversely to the motor shaft longitudinal axis.
  • an alignment between the north pole and the south pole of the permanent magnet extends transversely to the motor shaft longitudinal axis.
  • the magnetic field can thus be detected well by a magneto-resistive sensor.
  • the permanent magnet is cylindrical or at least partially cylindrical.
  • the recess can be advantageously produced by means of a drill.
  • the permanent magnet is cuboid or cube-shaped.
  • the recess may be formed for example by a slot which is formed in the region of the end of the motor shaft.
  • the slot can be generated for example by means of a saw or a milling cutter.
  • the permanent magnet is at least partially formed cuboid or cube-shaped.
  • the permanent magnet for example, with a portion of cuboid or cube-shaped, which is arranged in the recess.
  • a section projecting beyond the cutout which projects beyond the end of the motor shaft or which projects into the funnel described above, can be another
  • Shape for example, have a cylindrical shape. Due to the cuboid or cube-shaped design can advantageously be formed a positive connection in the rotational circumferential direction of the motor shaft, through which an orientation of a magnetic field of the permanent magnet is fixed relative to the motor shaft, and so to the rotor advantageous.
  • the permanent magnet is received in the region of the end portion of the motor shaft with a first longitudinal portion of the permanent magnet in a funnel-shaped recess of the motor shaft, wherein a second longitudinal portion of the permanent magnet is held in the end portion of the motor shaft, wherein the permanent magnet is one end of the end portion of the motor shaft not towered over.
  • the permanent magnet can send out field lines of the permanent magnetic field through the funnel beyond the end, where they can be detected by the rotor position sensor.
  • the Permanent magnet is so advantageous to save space in the end portion of the motor shaft completely absorbed.
  • the permanent magnet has an unmagnetized region.
  • the unmagnetized region is received in the recess.
  • the magnetic field can advantageously not be influenced by the motor shaft.
  • the motor shaft can be provided at low cost, since the permanent magnet can be magnetized, for example after insertion of an unmagnetized blank in the end portion of the motor shaft. Magnetic alignment can thus be advantageously determined after interconnecting the permanent magnet and the motor shaft so that alignment errors, such as swapping north and south pole orientations, can be avoided.
  • the permanent magnet comprises, for example, ferrite, or a permanent magnetic compound comprising the elements iron, nickel, cobalt, samarium, bismuth, manganese, or boron or a combination of these.
  • the compound is for example Neodym® or Permalloy.
  • Figure 1 shows an embodiment of an electric motor with a magneto-resistive sensor and a detectable by this arranged permanent magnet, which is partially received in an end portion of the motor shaft;
  • FIG. 2 shows an exemplary embodiment for an end section of the motor shaft already illustrated in FIG. 1, in which a cylindrical permanent magnet is partially accommodated;
  • Figure 3 shows an embodiment for an end portion of the motor shaft already shown in Figure 1, in which a cuboid permanent magnet is fully received;
  • Figure 4 shows an embodiment for an end portion of the motor shaft already shown in Figure 1, in which a cuboid permanent magnet is partially received;
  • Figure 5 shows the end portion shown in Figure 4 in a longitudinal sectional view;
  • FIG. 6 shows an exemplary embodiment of a permanent magnet for the end section of the motor shaft 5 in FIG. 1 or the end section according to FIGS. 3 and 4;
  • FIG. 7 shows a permanent magnet which is not magnetized on a longitudinal section designed to be received in the recess of the motor shaft;
  • Figure 8 shows a method for producing the permanent magnet shown in Figure 7, which is partially received in the recess of the motor shaft during magnetization.
  • Figure 9 shows an embodiment of an end portion of the motor shaft in Figure 1 in which a plastic-coated permanent magnet is held in a form-fitting manner in the recess.
  • the electric motor 1 shows schematically an embodiment for an electric motor 1.
  • the electric motor 1 has a rotor 3, which is rotatably connected to a motor shaft 5.
  • the electric motor 1 also has a stator 9 which comprises stator coils 10, 11 and 12.
  • the stator coils 10, 1 1 and 12 are interconnected in this embodiment in a star configuration.
  • the stator coils 10, 11 and 12 are each connected to a first connection with a control unit, in particular an output of a control unit 14. Second connections of the stator coils are connected to each other to form a star point connection.
  • the control unit 14 is designed to energize the stator coils 10, 11 and 12 of the stator for generating a rotating magnetic field as a function of a rotor position signal received on the input side.
  • the control unit 14 is connected on the input side to a rotor position sensor 15, which is arranged and configured to detect a magnetic field of the permanent magnet 30 and to generate the rotor position signal.
  • the rotor 3 of the electric motor 1 is, for example, a squirrel-cage rotor of an asynchronous machine, or a rotor of a synchronous machine designed as a permanent magnet.
  • the motor shaft 5 has an end section 6 (enlarged in this figure).
  • the end portion 6 has in the region of one end of the motor shaft 5 has a recess which is slot-shaped in this embodiment.
  • a permanent magnet 30 is at least partially received.
  • the permanent magnet 30 is received in the recess 48 with a longitudinal section 34 in the direction of a motor shaft longitudinal axis 20, and projects beyond the end of the motor shaft 5 with a longitudinal section 32 in the direction of the motor shaft longitudinal axis 20.
  • the permanent magnet 30 is in the range of
  • the permanent magnet 30 has a magnetization which extends transversely to the motor shaft longitudinal axis 20.
  • a south pole 36 and a north pole 38 of the permanent magnetization are respectively designated.
  • FIG. 2 schematically shows an exemplary embodiment of an end section 8 of the motor shaft 5 already illustrated in FIG. 1.
  • the end section 8 replaces the end section 6 already shown in FIG.
  • End portion 8 has a hollow cylindrical recess 49 in the region of the end, in which a permanent magnet 31 is at least partially received.
  • the permanent magnet 31 protrudes with a longitudinal section 32 along a motor shaft longitudinal axis 20 beyond the end of the motor shaft 5.
  • the permanent magnet 31 is frictionally inserted with a longitudinal section 34 in the hollow cylindrical recess 49 of the end section 8 of the motor shaft 5.
  • the permanent magnet 31 has a magnetization which extends transversely to the motor shaft longitudinal axis 20.
  • a south pole 36 and a north pole 38 of the permanent magnetization are respectively designated.
  • the permanent magnet 31 is in this embodiment in the range of
  • Figure 3 shows schematically an embodiment of an end portion 7 of the motor shaft already shown in Figure 1 5.
  • the end portion 7 replaced in this embodiment, the end portion 6 already shown in Figure 1.
  • the end portion 7 has - unlike the end portion 6 in Figure 1 - a at least funnel-shaped recess 42.
  • the recess 42 has for this purpose a funnel shape which borders on a funnel wall 40.
  • the funnel forms in This embodiment, a circular cone longitudinal section.
  • the funnel-shaped recess 42 opens into a longitudinal section 34 of the recess, which is cuboid-shaped, and in which a longitudinal section 34 of the permanent magnet 30 already shown in Figure 1 is arranged.
  • a longitudinal section 34 which in FIG.
  • the permanent magnet 30 is arranged in this embodiment by means of a plastic groove 46 which surrounds the longitudinal portion 34 of the permanent magnet 30 in the cuboid recess of the end portion 7 of the motor shaft 5.
  • the plastic groove 46 is formed for example by a polypropylene groove or polyamide groove.
  • plastic channel 46 is a sheet-metal spring made of nonmagnetizable metal, for example a channel-shaped channel.
  • the recess for example, in the manufacture of the end portion 7, first by means of a suitably trained counterbore of the funnels 42 - for example on a lathe - are made, whereupon then a slot in the end portion 7 is sawed by means of a saw or a milling cutter, in which the permanent magnet 30 together is inserted with the gutter or the cup.
  • a slot in the end portion 7 is sawed by means of a saw or a milling cutter, in which the permanent magnet 30 together is inserted with the gutter or the cup.
  • an acute-angled channel with flat channel walls instead of the conical funnel shown in FIG.
  • the permanent magnet 30 shown in FIG. 3 can, as shown in FIG. 1, replace the plastic trough 46 shown in FIG. 3 by means of the adhesive 45 shown in FIG. 1 together with the spacer particles 47 in that shown in FIG.
  • FIG. 4 schematically shows an exemplary embodiment of an end section 51 of a motor shaft, for example the motor shaft 5 illustrated in FIG End portion 51 has in the region of one end a recess 52 in which the permanent magnet 30 is partially received.
  • the end section 51 is formed tapering towards the end in the region of the recess 52, so that two jaws 55 and 57 are formed, which enclose the recess 52 between one another and hold the permanent magnet 30.
  • the recess is formed in this embodiment as a slot which can be sawn or milled, for example, in the end portion 51.
  • the permanent magnet 30 rotates upon rotation of the motor shaft 5 about the motor shaft longitudinal axis 20.
  • the permanent magnet 30 has a magnetization as a magnetic dipole, which is already shown in Figure 1.
  • the permanent magnet is magnetized according to the permanent magnet 35 in Figure 6 or according to the permanent magnet 33 in Figure 7.
  • FIG. 5 schematically shows the end section 51 shown in FIG. 4 in a longitudinal section.
  • the magnetic north pole 38 of the permanent magnet 30 is held in the region of the longitudinal portion 34 of the forceps jaw 55, the magnetic south pole 36 of the permanent magnet 30 is held in the region of the longitudinal portion 34 of the forceps jaw 57.
  • the longitudinal section 32 projects beyond the end of the end section 51 and can emit a magnetic field there.
  • FIG. 6 schematically shows a variant of a magnetization of a permanent magnet 35.
  • the permanent magnet 35 has a cuboid shape.
  • the magnetization runs transversely to the motor shaft longitudinal axis 20, but a dividing line which separates the north pole 38 from the south pole transversely to a longitudinal extent of the permanent magnet 35 extending transversely to the motor shaft longitudinal axis 20.
  • the longitudinal extent transversely to the motor shaft longitudinal axis 20 forms together with the motor shaft longitudinal axis 20 and the dividing line between the north pole 38 and the south pole 36 an orthogonal system.
  • the dividing line between the north pole 38 and the south pole 36 coincides with the longitudinal extent of the permanent magnet 30 extending transversely to the motor shaft longitudinal axis 20.
  • FIG. 7 schematically shows an embodiment for a permanent magnet 37, which is magnetized like the permanent magnet 30, so that the dividing line between the north pole 38 and the south pole 36 coincides with the longitudinal extent of the permanent magnet 30 running transverse to the motor shaft axis 20.
  • the permanent magnet 37 along its longitudinal extension in the direction of the motor shaft longitudinal axis 20 at least three mutually different magnetized areas, of which a portion 60 which at least partially magnetized the end portion 32 is magnetized and an unmagnetized area, which does not correspond to the received in the recess end portion 34 is magnetized.
  • a transition region 62 which is partially magnetized, extends in regions 60 and 64.
  • the permanent magnet 37 may, for example, be held in the recess instead of the permanent magnet 30 in FIG. 5 or instead of the permanent magnet 30 in FIG.
  • the region 62 may be in addition to the region 60 via the
  • end of the previously described end portions 5 or 51 protrude.
  • the region 60 or additionally the region 62 can protrude into the funnel 42.
  • FIG. 8 schematically shows a method for magnetizing a magnetizable material held in the recess of an end section, from which a permanent magnet 37 according to FIG. 7 is produced by means of the method.
  • a magnetizing device 65 is moved over the longitudinal section projecting beyond the end of the motor shaft end section 51, in particular the section 60 shown in FIG.
  • a magnetic field 70 is generated, the elementary magnets of the magnetizable material - in particular according to Figure 7 or Figure 6 - aligns, so that the permanent magnet 30 is generated.
  • FIG. 9 schematically shows a variant of the end section shown in FIGS. 4 and 5, in which a permanent magnet 30 is held between the jaws 55 and 57 in a longitudinal section.
  • the permanent magnet 30 is held between the jaws 55 and 57 in a longitudinal section.
  • the 30 has a plastic jacket 56 covering a surface of the permanent magnet 30.
  • the permanent magnet 30 is accommodated together with the plastic jacket on a longitudinal section in the recess.
  • the plastic jacket is formed, for example, to protect the permanent magnet 30 from corrosion.
  • At least one wedge-shaped projection 58 is integrally formed on the plastic jacket, for example, so that the projection 58 of the permanent magnet 30 can engage in the recess of the end section 51 in a corresponding recess in the wall of the recess when inserted in the direction of a motor shaft longitudinal axis 20 and the permanent magnet 30 thus forms - is secured against a move out of the end portion.
  • the plastic jacket can be produced, for example, by encapsulation of the permanent magnet 30.
  • the plastic jacket is designed to enclose the permanent magnet 30 at least partially or completely.

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

Abstract

L'invention concerne un moteur électrique, notamment un moteur électrique à commutation électronique. Le moteur électrique comprend un rotor de conception notamment à aimant permanent. Le moteur électrique présente également un capteur de position de rotor, qui est conçu pour détecter une position du rotor en fonction d'un aimant permanent relié solidaire en rotation au rotor et pour générer un signal de position du rotor représentant ladite position de rotor. Un arbre du moteur électrique du type susmentionné présente un évidement. L'aimant permanent est disposé au moins partiellement dans l'évidement.
PCT/EP2012/064257 2011-07-22 2012-07-20 Moteur électrique doté d'un aimant lié à la position de rotor WO2013014071A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011079657.6 2011-07-22
DE102011079657A DE102011079657A1 (de) 2011-07-22 2011-07-22 Elektromotor mit einem Rotorpositionsmagnet

Publications (2)

Publication Number Publication Date
WO2013014071A2 true WO2013014071A2 (fr) 2013-01-31
WO2013014071A3 WO2013014071A3 (fr) 2013-04-25

Family

ID=46545800

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/064257 WO2013014071A2 (fr) 2011-07-22 2012-07-20 Moteur électrique doté d'un aimant lié à la position de rotor

Country Status (2)

Country Link
DE (1) DE102011079657A1 (fr)
WO (1) WO2013014071A2 (fr)

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DE102014218060A1 (de) * 2014-09-10 2016-03-10 Robert Bosch Gmbh Elektrische Maschine mit einem Anker
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DE102015201411A1 (de) * 2015-01-28 2016-07-28 Robert Bosch Gmbh Motor-Pumpen-Aggregat für ein Bremssystem
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JP6801170B2 (ja) * 2015-09-10 2020-12-16 日立金属株式会社 回転角検出用磁石、回転角検出装置及び回転角検出用磁石の製造方法
DE102016216088A1 (de) 2016-08-26 2018-03-01 Continental Automotive Gmbh Elektrische Maschine
DE102017005420B4 (de) * 2017-06-09 2022-04-21 Thomas Magnete Gmbh Bestimmung der Rotorlage eines Elektromotors
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WO2019012693A1 (fr) * 2017-07-14 2019-01-17 三菱電機株式会社 Machine électrique tournante
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Also Published As

Publication number Publication date
DE102011079657A1 (de) 2013-01-24
WO2013014071A3 (fr) 2013-04-25

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