WO2019245112A1 - Structure de rotor pour la détection de la position d'un moteur - Google Patents

Structure de rotor pour la détection de la position d'un moteur Download PDF

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Publication number
WO2019245112A1
WO2019245112A1 PCT/KR2018/013205 KR2018013205W WO2019245112A1 WO 2019245112 A1 WO2019245112 A1 WO 2019245112A1 KR 2018013205 W KR2018013205 W KR 2018013205W WO 2019245112 A1 WO2019245112 A1 WO 2019245112A1
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WO
WIPO (PCT)
Prior art keywords
rotor
detecting
motor
auxiliary
electric motor
Prior art date
Application number
PCT/KR2018/013205
Other languages
English (en)
Korean (ko)
Inventor
강동우
설현수
Original Assignee
계명대학교 산학협력단
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 계명대학교 산학협력단 filed Critical 계명대학교 산학협력단
Publication of WO2019245112A1 publication Critical patent/WO2019245112A1/fr

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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
    • 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
    • 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]

Definitions

  • the present invention relates to a rotor structure for detecting a position of an electric motor, and more particularly, to implement a rotor shape structure for detecting a position of a brushless DC (BLDC) motor, wherein the notch is formed on the q axis of the rotor and the auxiliary rotor.
  • the arrangement relates to a rotor structure for detecting a position of an electric motor that can eliminate a signal distortion factor and reduce torque rise and torque ripple.
  • a BLDC motor removes a brush that acts as a commutator in a DC motor and maintains the properties of the DC motor.
  • the BLDC motor includes a stator made of a three-phase coil, a rotor made of a permanent magnet, and a position detecting device.
  • the BLDC motor rotates the rotor by flowing a current to each phase of the stator side coil of the BLDC motor and causing a magnetic field to be generated by the current.
  • the BLDC motor detects the strength of the magnetic field of the rotor, and the rotor continues in one direction by sequentially turning on / off switching elements for changing the direction of the current flowing in each phase of the coil according to the detected magnetic field. To rotate.
  • the BLDC motor does not use a brush, but detects the position of the rotor performed by the brush through a Hall sensor using the magnetic field and strength of the rotor, and uses the detected signal to position the rotor of the BLDC motor. It generates a signal for position control to control the.
  • the structure of the BLDC motor using the Hall sensor for detecting the position of the rotor can be largely divided into two types.
  • the first method is to design the stacking length of the rotor a little higher than the stator.
  • the three Hall sensors are electrically placed on the stator at 120-degree intervals to detect the position of the rotor.
  • the second method is to apply the auxiliary rotor.
  • the shape of the ring magnet or SPM (Surface Permanent Magnet) type is mainly used. Will be placed.
  • the auxiliary rotor when detecting the position of the BLDC motor, it can be divided into two types according to the shape of the rotor.
  • the first is to use a ring magnet or SPM type auxiliary rotor regardless of the shape of the rotor.
  • the second case uses the same type as the shape of the rotor. If the shape of the rotor is an IPM (Interior Permanent Magnet) type, the rotor and the position detecting rotor have the same shape.
  • IPM Interior Permanent Magnet
  • FIG. 1 is a diagram showing a perspective view of a rotor structure having a conventional position detecting auxiliary rotor
  • FIG. 1 (a) shows a structure of a rotor having a ring magnet type position detecting auxiliary rotor. The structure is shown
  • FIG. 1 (b) has shown the structure of the rotor structure provided with the auxiliary rotor for position detection of IPM type.
  • 2 is a view showing the waveform of the pore magnetic flux density of the conventional auxiliary rotor for IPM type position detection
  • Figure 3 is a view showing the Hall sensor waveform of the conventional rotor for the IPM type position detection.
  • the Hall sensor is a sensor whose output is '1' when a specific magnetic flux value is measured, and the distortion of the air gap magnetic flux density waveform (see FIG. 2) caused by the leakage magnetic flux causes distortion of the Hall sensor signal (see FIG. 3).
  • the present invention has been proposed to solve the above problems of the conventionally proposed methods, and implements a rotor-shaped structure for detecting the position of a brushless DC (BLDC) motor, but the q-axis of the rotor and the auxiliary rotor It is an object of the present invention to provide a rotor structure for detecting the position of an electric motor by arranging each notch so as to eliminate a signal distortion factor and reduce torque rise and torque ripple.
  • BLDC brushless DC
  • the present invention is configured by inserting the notch into the q-axis of the auxiliary rotor and the rotor for detecting the position of the motor, the magnetic resistance of the q-axis increases, thereby controlling the magnetic resistance and the air gap magnetic flux through the torque ripple It is another object of the present invention to provide a rotor structure for detecting the position of an electric motor, which can reduce the signal distortion, and in particular the signal distortion phenomenon in the hall sensor can be eliminated.
  • the present invention by configuring the auxiliary rotor and rotor for the position detection of the IPM type in the same shape, the cost reduction through the reduction in manufacturing process and cost reduction as well as the torque is increased compared to the conventional IPM type It is another object of the present invention to provide a rotor structure for detecting the position of an electric motor, which can achieve a remarkable effect of reducing torque ripple.
  • Rotor structure for detecting the position of the motor according to a feature of the present invention for achieving the above object
  • a rotor in which a rotating shaft is press-fitted in the center and radially disposed with respect to the center of rotation and a plurality of permanent magnets are disposed in the rotor core having a rotation radius;
  • auxiliary rotor which is press-fitted and fixed to the upper part of the rotary shaft press-fitted to the center of the rotor, and functions to detect the position of the electric motor.
  • the rotor Preferably, the rotor,
  • the plurality of permanent magnets may be embedded in an IPM (Interior Permanent Magnet) type.
  • the notch may be inserted into the q-axis of the rotor core.
  • the notch increases the magnetoresistance of the q-axis, thereby controlling the magnetoresistance and the air gap magnetic flux, thereby reducing the torque ripple.
  • the auxiliary rotor Preferably, the auxiliary rotor,
  • a notch in the q axis of the auxiliary rotor core.
  • auxiliary rotor More preferably, the auxiliary rotor,
  • the notch increases the magnetoresistance of the q-axis, thereby controlling the magnetoresistance and the air gap magnetic flux, thereby reducing the torque ripple.
  • auxiliary rotor More preferably, the auxiliary rotor,
  • It can be configured to have the same shape structure as the rotor.
  • auxiliary rotor More preferably, the auxiliary rotor,
  • Press-fit fixed to the upper portion of the rotary shaft indented in the center of the rotor it may be configured to have a structure in which a plurality of auxiliary permanent magnets are disposed on the auxiliary rotor core having a radial radius is disposed radially based on the rotation center.
  • the plurality of auxiliary permanent magnets may be embedded in an IPM (Interior Permanent Magnet) type.
  • auxiliary rotor More preferably, the auxiliary rotor,
  • auxiliary rotor More preferably, the auxiliary rotor,
  • It may be disposed at a position higher than the stator to enable position detection through three Hall sensors provided in the motor.
  • stator is
  • the three Hall sensors can be electrically arranged at 120 degree intervals to detect the position of the auxiliary rotor.
  • the notch inserted into the rotor core of the rotor and the notch inserted into the auxiliary rotor core of the auxiliary rotor may be positioned in the same position.
  • the electrical steel sheet of the rotor core may be composed of a non-oriented silicon steel sheet material.
  • auxiliary rotor core Even more preferably, the auxiliary rotor core,
  • the electrical steel sheet of the auxiliary rotor core may be made of a non-oriented silicon steel sheet material.
  • It can be composed of rare earth permanent magnets.
  • It is composed of a rare earth permanent magnet, but may be composed of neodymium (NdFeB) magnet material.
  • It can be composed of rare earth permanent magnets.
  • the rare earth rare earth permanent magnets are buried, but may be composed of neodymium (NdFeB) magnet material.
  • the rotor structure is
  • It may be disposed and installed in the inner center of the stator fixedly installed in the motor housing of the motor.
  • stator is
  • It may be composed of a stator core in which a coil is wound around a cylindrical stator body.
  • the rotor structure is
  • stator Fixedly installed in the motor housing of the motor, and can be applied to a BLDC motor system that detects the position of the rotor using a hall sensor.
  • each notch By arranging Notch, it is possible to eliminate the signal distortion factor and reduce the torque rise and the torque ripple.
  • the magnetic resistance of the q-axis increases, thereby controlling the magnetic resistance and the air gap magnetic flux through the torque Ripple can be reduced, and in particular the signal distortion in the Hall sensor can be eliminated.
  • the present invention by configuring the auxiliary rotor and rotor for the position detection of the IPM type in the same shape, the cost reduction through the reduction in manufacturing process and cost reduction as well as the torque is increased compared to the conventional IPM type In addition, a remarkable effect of reducing torque ripple can be obtained.
  • Fig. 2 is a view showing waveforms of air gap magnetic flux density of a conventional rotor for IPM type position detection.
  • FIG. 3 is a view showing a Hall sensor waveform of a conventional rotor for IPM type position detection.
  • FIG. 4 is a diagram showing a perspective view of the rotor structure for detecting the position of the motor according to an embodiment of the present invention.
  • FIG. 5 is a plan view showing the auxiliary rotation of the rotor structure for detecting the position of the motor according to an embodiment of the present invention.
  • FIG. 6 is a view showing a pore flux density waveform of an auxiliary rotor for IPM type position detection in a rotor structure for detecting a position of an electric motor according to an embodiment of the present invention
  • FIG. 7 is a view illustrating a hall sensor waveform of an auxiliary rotor for detecting an IPM type position in a rotor structure for detecting a position of an electric motor according to an embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a comparison of torque waveforms of an IPM type rotor model and a conventional IPM type rotor model applied to a rotor structure for detecting a position of an electric motor according to an embodiment of the present invention.
  • FIG. 4 is a diagram showing a perspective view of the rotor structure for detecting the position of the motor according to an embodiment of the present invention
  • Figure 5 is a secondary rotation of the rotor structure for detecting the position of the motor according to an embodiment of the present invention
  • 6 is a view showing a planar configuration of FIG. 6 is a view showing a pore flux density waveform of an auxiliary rotor for IPM type position detection in a rotor position detecting rotor structure of an electric motor according to an embodiment of the present invention.
  • FIG. 7 is a view showing a hall sensor waveform of the IPM type position detecting auxiliary rotor in the rotor structure for detecting the position of the motor according to an embodiment of the present invention
  • Figure 8 is a motor according to an embodiment of the present invention
  • Fig. 1 shows the comparison of the torque waveforms of the IPM type rotor model and the conventional IPM type rotor model applied to the rotor structure for position detection.
  • the rotor structure 100 for detecting the position of the electric motor according to an embodiment of the present invention includes a rotor 100 and an auxiliary rotor 120. Can be.
  • the rotor 110 is a configuration in which a plurality of permanent magnets 113 are disposed in the rotor core 112 having a rotation radius radially disposed with respect to the center of rotation and the rotary shaft 111 is pressed in the center.
  • the rotor 110 may be a plurality of permanent magnets 113 is embedded in an IPM (Interior Permanent Magnet) type.
  • IPM Interior Permanent Magnet
  • the rotor 110 may be configured to insert the notch 114 into the q-axis of the rotor core 112 to increase torque and reduce torque ripple of the motor. .
  • the rotor 110 increases the magnetic resistance of the q-axis through the notch 114, thereby controlling the magnetic resistance and the air gap magnetic flux to function to reduce the torque ripple.
  • the rotor core 112 of the rotor 110 is composed of an integral laminated structure using an electrical steel sheet
  • the electrical steel sheet of the rotor core 112 may be composed of a non-oriented silicon steel sheet material.
  • the plurality of permanent magnets 113 of the rotor 110 may be composed of a rare earth permanent magnet.
  • the plurality of permanent magnets 113 may be embedded with rare earth permanent magnets, but may be made of neodymium (NdFeB) magnet material.
  • the auxiliary rotor 120 is press-fitted and fixed to the upper portion of the rotary shaft 111 press-fitted to the center of the rotor 110, and is configured to function for position detection of the electric motor. As shown in FIGS. 4 and 5, the auxiliary rotor 120 is notched on the q-axis of the auxiliary rotor core 121 to eliminate signal distortion of the hall sensor provided for position detection of the motor. (Notch) 123 may be formed to insert the structure.
  • the auxiliary rotor 120 has a large magnetic resistance of the q-axis through the notch 123, thereby controlling the magnetic resistance and the air gap magnetic flux to function to reduce the torque ripple.
  • auxiliary rotor 120 may be configured to have the same shape structure as the rotor 110, as shown in FIG.
  • the auxiliary rotor 120 is press-fitted and fixed to the upper portion of the rotary shaft 111 press-fitted to the center of the rotor 110, radially disposed with respect to the center of rotation to the auxiliary rotor core 121 having a rotation radius It may be configured in a structure in which a plurality of auxiliary permanent magnets 122 are arranged.
  • auxiliary rotor 120 like the plurality of permanent magnets 113 of the rotor 110 may be a plurality of auxiliary permanent magnets 122 are embedded in an IPM (Interior Permanent Magnet) type. Since the auxiliary rotor 120 is configured to have the same shape structure as the rotor 110, it is possible to reduce the manufacturing process and cost reduction.
  • IPM Interior Permanent Magnet
  • the auxiliary rotor 120 is preferably disposed at a position higher than the stator (not shown) to enable the position detection through three Hall sensors (not shown) provided in the motor.
  • the stator is a general configuration of the electric motor, it is possible to detect the position of the auxiliary rotor 120 by placing three Hall sensors electrically 120 degrees apart.
  • the stator may be composed of a stator core in which a coil is wound around a cylindrical stator body.
  • the three Hall sensors and the stator correspond to the general configuration of the motor, so unnecessary description thereof will be omitted.
  • the auxiliary rotor core 121 of the auxiliary rotor 120 is composed of an integral laminated structure using an electrical steel sheet
  • the electrical steel sheet of the auxiliary rotor core 121 may be composed of a non-oriented silicon steel sheet material have.
  • the plurality of auxiliary permanent magnets 122 of the auxiliary rotor 120 may be composed of a rare earth permanent magnet.
  • the plurality of auxiliary permanent magnets 122 may be buried as rare earth rare earth permanent magnets, but may be made of neodymium (NdFeB) magnet material.
  • the rotor structure 100 includes a notch 114 inserted into the rotor core 112 of the rotor 110 and an auxiliary rotor core of the auxiliary rotor 120.
  • the location of the notch 123 inserted into the 121 may be the same.
  • the rotor structure 100 is disposed in the inner center of the stator fixedly installed in the motor housing of the motor, is disposed in the inner center of the stator fixedly installed in the motor housing of the motor, It can be applied to BLDC motor system for detecting the position of the rotor.
  • the rotor structure 100 may be implemented as a system in which a BLDC motor is used in a field such as a household washing machine, an air conditioner, and a vehicle electric appliance.
  • FIG. 6 illustrates a pore flux density waveform of an auxiliary rotor for detecting an IPM type in a rotor structure for detecting a position of an electric motor according to an embodiment of the present invention
  • FIG. 7 illustrates an electric motor according to an embodiment of the present invention.
  • the hall sensor waveform of the IPM type position detecting auxiliary rotor is shown.
  • each notch (notch) on the q-axis of the rotor and the auxiliary rotor By arranging), it can be seen that the waveform of the pore magnetic flux density due to the leakage magnetic flux and the distortion of the measured signal of the Hall sensor are eliminated.
  • FIG. 8 illustrates a comparison of torque waveforms of an IPM type rotor model and a conventional IPM type rotor model applied to a rotor structure for detecting a position of an electric motor according to an embodiment of the present invention.
  • the rotor structure according to the present invention can be seen that the effect of increasing the torque, the torque ripple is reduced than the conventional IPM type model can be seen.
  • the rotor structure for detecting the position of the motor while implementing a rotor shape structure for detecting the position of the brushless DC (BLDC) motor, q of the rotor and the auxiliary rotor
  • BLDC brushless DC
  • q of the rotor and the auxiliary rotor By arranging each notch on the shaft, it is possible to eliminate the signal distortion factor and to reduce the torque rise and the torque ripple, and also the q of the auxiliary rotor and rotor for position detection of the motor.
  • the magnetoresistance of the q axis is increased, and the torque ripple can be reduced by controlling the magnetoresistance and the air gap magnetic flux. It becomes possible.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Brushless Motors (AREA)

Abstract

Selon une structure de rotor permettant de détecter une position d'un moteur proposée par la présente invention, une structure de forme de rotor pour détecter une position d'un moteur à CC sans balai (BLDC) est mise en œuvre, des encoches étant conçues pour être agencées sur les axes q du rotor et d'un rotor auxiliaire, respectivement. Par conséquent, la structure de rotor peut éliminer une cause de distorsion de signal, augmenter le couple et diminuer l'ondulation de couple.
PCT/KR2018/013205 2018-06-20 2018-11-01 Structure de rotor pour la détection de la position d'un moteur WO2019245112A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020180071095A KR102038084B1 (ko) 2018-06-20 2018-06-20 전동기의 위치 검출용 회전자 구조
KR10-2018-0071095 2018-06-20

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Publication Number Publication Date
WO2019245112A1 true WO2019245112A1 (fr) 2019-12-26

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PCT/KR2018/013205 WO2019245112A1 (fr) 2018-06-20 2018-11-01 Structure de rotor pour la détection de la position d'un moteur

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WO (1) WO2019245112A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102337453B1 (ko) * 2019-12-31 2021-12-09 주식회사 코렌스이엠 센싱용 영구자석 노출을 최소화한 직류 전동기

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003274585A (ja) * 2002-03-18 2003-09-26 Sanyo Electric Co Ltd 集中巻式ｄｃモータ
JP2004048829A (ja) * 2002-07-08 2004-02-12 Nidec Shibaura Corp ブラシレスｄｃモータ
JP2006109553A (ja) * 2004-10-01 2006-04-20 Japan Servo Co Ltd Ｄｃブラシレスモータの磁極検出マグネットの固定方法
JP2012228014A (ja) * 2011-04-18 2012-11-15 Mitsuba Corp ブラシレスモータ
EP2822160A1 (fr) * 2013-07-02 2015-01-07 Vernis Motors, S.L. Générateur ou moteur sans balai à couple de réluctance réduite

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0650246B1 (fr) * 1992-07-09 2001-11-21 Seiko Epson Corporation Moteur sans balais
JP2601998Y2 (ja) * 1993-09-17 1999-12-13 日本精工株式会社 ３相ブラシレスモータ
KR100196430B1 (ko) * 1995-10-26 1999-06-15 엄기화 무정류자 모터의 회전자 위치 검출용 자석
KR19980075864A (ko) * 1997-04-02 1998-11-16 윤종용 브러시리스 dc모터
JP3517350B2 (ja) * 1998-03-18 2004-04-12 アスモ株式会社 モータ
KR20180019687A (ko) * 2015-08-21 2018-02-26 미쓰비시덴키 가부시키가이샤 회전 전기기계 및 공기 조화 장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003274585A (ja) * 2002-03-18 2003-09-26 Sanyo Electric Co Ltd 集中巻式ｄｃモータ
JP2004048829A (ja) * 2002-07-08 2004-02-12 Nidec Shibaura Corp ブラシレスｄｃモータ
JP2006109553A (ja) * 2004-10-01 2006-04-20 Japan Servo Co Ltd Ｄｃブラシレスモータの磁極検出マグネットの固定方法
JP2012228014A (ja) * 2011-04-18 2012-11-15 Mitsuba Corp ブラシレスモータ
EP2822160A1 (fr) * 2013-07-02 2015-01-07 Vernis Motors, S.L. Générateur ou moteur sans balai à couple de réluctance réduite

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