EP3513483A1 - Aimant segmenté et moteur à aimant permanent muni d'un aimant segmenté - Google Patents

Aimant segmenté et moteur à aimant permanent muni d'un aimant segmenté

Info

Publication number
EP3513483A1
EP3513483A1 EP17784918.9A EP17784918A EP3513483A1 EP 3513483 A1 EP3513483 A1 EP 3513483A1 EP 17784918 A EP17784918 A EP 17784918A EP 3513483 A1 EP3513483 A1 EP 3513483A1
Authority
EP
European Patent Office
Prior art keywords
magnet
segment
radius
function
segment magnet
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP17784918.9A
Other languages
German (de)
English (en)
Inventor
Elmar Hoppach
Sunny Zhang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brose Fahrzeugteile SE and Co KG
Original Assignee
Brose Fahrzeugteile SE and Co KG
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 Brose Fahrzeugteile SE and Co KG filed Critical Brose Fahrzeugteile SE and Co KG
Publication of EP3513483A1 publication Critical patent/EP3513483A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H02K1/278—Surface mounted magnets; Inset magnets
    • H02K1/2781—Magnets shaped to vary the mechanical air gap between the magnets and the stator
    • 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
    • H02K1/17—Stator cores with permanent magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general
    • H01F7/021—Construction of PM
    • 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 segment magnet, in particular a segment magnet for a permanent magnet ⁇ motor, and a permanent magnet with segment magnets.
  • the course of the magnetic field in an air gap ei ⁇ nes electric motor between the rotor and stator influenced in a decisive way the performance of the engine.
  • the performance of the engine is affected by the variation of the magnetic field, the Leis ⁇ tung dense, the torque uniformity and Ge ⁇ the noise levels of the engine. It is the goal of a permanent magnetic excitation of the magnetic field in the air gap to maximize the flux fundamental while minimizing interfering upper fields.
  • Magnetic segments with radial and parallel magnetization are known for permanently excited electric motors.
  • This effect is particularly pronounced at radially magnetized Magnetseg ⁇ elements, wherein opposite paral lel magnetized magnet ⁇ a higher flux linkage can be achieved in this case.
  • the edges of the magnet segments are variously beveled. This leads to a reduction of the magnetic flux density. As a result, the utilization of the refrigerator to favor ⁇ a lower noise emission decreases.
  • a variety of courses for the magnetic flux can be realized in recent times. A possible course is described, for example, by the so-called Halbach structure.
  • a magnet array of several sub-segments of permanent magnets is assembled, the magnetization direction is tilted against each other by 90 ° in the direction of a longitudinal axis. The field lines move closer together on one side, while on the opposite side the field lines are farther apart and the magnetic field is weakened.
  • segment magnets for electric motor, which allows an optimized utilization of the magnetic material at the same time improved Be ⁇ operating characteristics, such as reduced noise.
  • segment magnets which can be parameterized as freely as possible, the parameterization of which can be supplied both to a field calculation in the design of the electric motor and to the required manufacturing method for the corresponding segment magnet.
  • the present invention in one aspect, provides a segment magnet for a permanent magnet motor.
  • the segment magnet is characterized in that a magnetization vector of the segment magnet ⁇ along an outer edge of the Seg ment ⁇ magnets having an angle-dependent direction. This angle-dependent direction is described here by a continuous, cyclic function.
  • the present OF INVENTION ⁇ dung relates to a permanent magnet motor.
  • the permanent magnet motor comprises a stator and a rotor rotatably mounted on the stator.
  • Rotor or stator comprise a magnet with multiple magnetic poles.
  • the magnet of the rotor or stator includes several inventive segment Magne ⁇ te.
  • the present invention is based on the recognition that conventional segment magnets, as they are widely used in permanent magnet motors, due to constructive measures to minimize the noise in general, the magnetic material used can exploit only Unzu ⁇ reaching.
  • constructive measures ⁇ taken such as the bevel of the edges of the magnet lead to a reduced magnetic flux density.
  • the present invention is therefore based on the idea to take this finding into account and provide a Segmentmag ⁇ net for a permanent-magnet electric motor, in addition to optimized operating characteristics, such as a reduced noise, improved utilization of the required magnetic material and thus a high magnetic flux density in relation to allows the used magnetic material. Further, the present invention provides a segment magnet whose Para ⁇ metrization be described mathematically. In this way, the parameters of the segment magnet can be easily supplied to a field calculation, for example, for the development or construction of electric motors, and moreover, the parameters of such a segment magnet can also be easily fed to a manufacturing process. As a result, both time and cost advantages can be realized.
  • the angle-dependent variation of the magnetization vector according to a continuous cyclic function allows a suitable parameterization of the direction of the magnetization vector.
  • the magnetization direction can be well adapted to the contour of a motor housing.
  • the cyclic function for describing the direction of the magnetization vector along the outer curve of the segment magnet comprises a sum of a plurality of cyclic terms.
  • Cyclic terms are special ⁇ periodic functions, such as a sine or cosine function.
  • the cyclic function for describing the direction v ( ⁇ ) of the magnetization vector along the outer edge of the segment magnet is formed according to the following formula: n
  • ⁇ ( ⁇ ) represents the angle of the direction of the magnetization vector towards ⁇ above the respective radius vector.
  • p corresponds to the number of pole pairs to be realized permanent magnet motor,
  • n is an integer modeling degrees for the Magneti ⁇ s istsvektor on.
  • ak are the modeling coefficients of the magnetization vector. The above-described formula thereby describes a Fourier representation of the direction of the magnetization vector along the outer edge of the Seg ment ⁇ magnets.
  • the first modeling ⁇ coefficient ai an angular range between 10 degrees and 50
  • the other modeling coefficients a2 to a n are preferably smaller than the first Modellie ⁇ approximately coefficient ai.
  • an outer edge of the Seg ment ⁇ magnet on an angle-dependent outer radius is described by a further cyclic function.
  • the further cyclic function for describing the radius for the outer edge of the segment magnet comprises a sum of a plurality of cyclic terms.
  • Cyclic Terme include, as already explained above, the special ⁇ periodic functions, such as a sine function or a cosine function.
  • the further cyclic function for describing the radius R (cp) of the outer edge for the segment magnet is formed according to the following formula: m
  • ⁇ describes an angle of the radius vector with respect to a given direction.
  • R (cp) represents the angle-dependent function of the radius of the outer edge of the segment Magne ⁇ th.
  • P indicates the number of pole pairs of the permanent magnet motor, for which the segment magnets are used sol ⁇ len, m defining an integer modeling degree of
  • Radius function, bk are the modeling coefficients of
  • Radius function indicates an inner diameter of a pole pot of the permanent magnet motor.
  • the formula described above describes a Fourier representation for the development of the shape of the outer edge of the segment magnet.
  • the first modeling ⁇ coefficient bi of the radius function in a range of values from 0.03 to 0.12.
  • the others can Modeling coefficients b2 to b m the radius function preferably be smaller than the selected first Modellie ⁇ coefficient approximately the radius function.
  • FIG. 1 shows a schematic representation of a cross section through a permanent magnet motor with segment magnets according to an embodiment
  • Figure 2 is a schematic representation of a cross section through a segment magnet according to an embodiment
  • Figure 3 is a schematic representation of a field curve for a magnetic field in a permanent magnet motor with ⁇ segment magnets according to an embodiment.
  • 1 shows a schematic representation of a Perma ⁇ nentmagnetmotors according to an embodiment.
  • the Perma ⁇ nentmagnetmotor comprises a housing 2 are arranged at the four segment magnets. 1 These four segment magnets 1 bil ⁇ here the stator of the motor. Further, the permanent magnet motor 2 comprises a rotatable rotor 3.
  • the permanent magnet motor 2 comprises a rotatable rotor 3.
  • the following description of a four-pole motor is for illustrative purposes only and does not limit the present invention to a predetermined number of poles.
  • the facing in the direction of the rotor 3 inside of Seg ⁇ ment magnets 1 has an at least approximately circular surface, so that each segment magnet 1 in the direction of the rotor 3, the surface of a cylinder segment.
  • the shape of the facing in the direction of the housing outside of the segments 1 is formed in accordance with a steady cyclic function ⁇ cally. This steady cyclical radio ⁇ tion is explained below in more detail.
  • the housing 2 is adapted to the housing 2 facing side of the segment magnets 1.
  • the cyclic function which describes the outer side of the segment magnets 1 facing the housing 2 it can be, in particular, a shape which according to a Fourier representation can be described as the sum of a plurality of cyclic terms.
  • the configuration of this Fourier representation will be described below with reference to FIG. In this case, the distance R (cp) of the outer edge of the housing 2 side facing the segment magnet 1 to a center of the motor according to the following formula be written ⁇ m
  • the angle ⁇ describes the angle between a current radius vector and a center axis of the segment magnet 1 shown in dashed lines in FIG. 2.
  • the number of pole pairs of the motor is described by d, d0 describes the inside diameter of a pole pot of the motor to be realized.
  • the coefficients bk represent Modell istskoeffi ⁇ coefficient represents the radius function R (cp), which describes the the housing 2 of the engine-facing side of the segment magnets. 1
  • the upper limit m of the summation function represents the degree of modeling. As a rule, a single- digit modeling degree of, for example, three, four or five coefficients is sufficient here. In addition, however, any higher modeling levels are possible.
  • the first modeling coefficient bi may preferably be in
  • Range between 0.03 and 0.12 are chosen.
  • values of 0.05, 0.07 or 0.1, for example, are suitable for a first modeling coefficient bi.
  • Modeling coefficients b2 to b m generally indicate
  • Modeling coefficients with increasing atomic number a decreasing value In addition to the previously described shaping of the segment magnets 1, the direction of the magnetization vector in the segment magnets can also be represented by a cyclic function, in particular by a Fourier series. The here asked before ⁇ magnetization direction of the segment magnets 1 differs from conventional doing magnetization ⁇ insurance forms, such as a radial, parallel or Halbach magnetization.
  • Figure 3 shows a schematic representation of a Magneti ⁇ tion of a magnetic circuit using the example of a four-pole motor.
  • the direction ⁇ ( ⁇ ) of the magnetization vector ent ⁇ long an outer edge of the segment magnet 1 can be ⁇ example described according to the following formula: n
  • ⁇ describes the angle of the radius vector.
  • ⁇ Rich processing of the magnetization vector in relation to the Radiusvek ⁇ gate is described by ⁇ ( ⁇ ).
  • p represents the number of pole pairs of the electric motor
  • the first model ⁇ l istsko steep ai for example, a value between 10 degrees and 50
  • a segment magnet 1 with the above-described external geometry and magnetization direction of the segment magnets may be formed of a permanent-magnet electric motor which can be achieved with a reduced use of materials for the magnetic material optimized Radioei ⁇ properties for an electric motor.
  • the running properties, such as the noise can be improved.
  • the present invention relates to an optimized segment magnet for a permanent magnet motor.

Landscapes

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

Abstract

L'invention concerne un aimant segmenté optimisé destiné à un moteur à aimant permanent. L'établissement d'une courbe de magnétisation à l'intérieur de l'aimant segmenté selon une fonction cyclique continue permet d'obtenir des caractéristiques de fonctionnement optimisées pour une moindre utilisation de matière. La formation cyclique de la direction de magnétisation dans l'aimant segmenté peut en outre être combinée à une mise en forme selon une autre fonction cyclique pour renforcer encore cet effet.
EP17784918.9A 2016-10-06 2017-10-04 Aimant segmenté et moteur à aimant permanent muni d'un aimant segmenté Withdrawn EP3513483A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016219395.3A DE102016219395A1 (de) 2016-10-06 2016-10-06 Segmentmagnet und Permanentmagnetmotor mit Segmentmagneten
PCT/EP2017/075190 WO2018065455A1 (fr) 2016-10-06 2017-10-04 Aimant segmenté et moteur à aimant permanent muni d'un aimant segmenté

Publications (1)

Publication Number Publication Date
EP3513483A1 true EP3513483A1 (fr) 2019-07-24

Family

ID=60120029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17784918.9A Withdrawn EP3513483A1 (fr) 2016-10-06 2017-10-04 Aimant segmenté et moteur à aimant permanent muni d'un aimant segmenté

Country Status (5)

Country Link
EP (1) EP3513483A1 (fr)
JP (1) JP2019530421A (fr)
CN (1) CN109891710B (fr)
DE (1) DE102016219395A1 (fr)
WO (1) WO2018065455A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020083511A1 (fr) * 2018-10-26 2020-04-30 Aichi Steel Corporation Stator pour machine électrique tournante comprenant au moins un aimant permanent à épaisseur radiale variable

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3620397A1 (de) * 1986-06-18 1988-03-17 Bosch Gmbh Robert Elektrische maschine, insbesondere gleichstromkleinmotor
JPH0279738A (ja) * 1988-09-12 1990-03-20 Mitsubishi Electric Corp 同期式ａｃサーボモータの回転子
CN1251382C (zh) * 1999-12-13 2006-04-12 三菱电机株式会社 永久磁铁型电动机及永久磁铁型电动机的制造方法
JP2003088057A (ja) * 2001-09-14 2003-03-20 Nichia Chem Ind Ltd モータ界磁用磁石及びその製造方法
JP2007006688A (ja) * 2005-05-27 2007-01-11 Minebea-Matsushita Motor Corp 小型ｄｃモータ
CN100576702C (zh) * 2005-05-27 2009-12-30 美蓓亚马达株式会社 小型直流电动机
FR2920259B1 (fr) * 2007-08-22 2015-03-27 Valeo Equip Electr Moteur Machine electrique tournante, en particulier pour un demarreur automobile
JP2015228762A (ja) * 2014-06-02 2015-12-17 日東電工株式会社 永久磁石、永久磁石の製造方法、回転電機及び回転電機の製造方法
CN104091060B (zh) * 2014-06-30 2017-01-18 天津大学 一种分段式Halbach阵列永磁电机磁场计算方法

Also Published As

Publication number Publication date
CN109891710B (zh) 2021-09-14
WO2018065455A1 (fr) 2018-04-12
CN109891710A (zh) 2019-06-14
JP2019530421A (ja) 2019-10-17
DE102016219395A1 (de) 2018-04-12

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