WO2021120680A1 - Rotor de moteur et moteur à pôles alternatifs - Google Patents

Rotor de moteur et moteur à pôles alternatifs Download PDF

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Publication number
WO2021120680A1
WO2021120680A1 PCT/CN2020/111625 CN2020111625W WO2021120680A1 WO 2021120680 A1 WO2021120680 A1 WO 2021120680A1 CN 2020111625 W CN2020111625 W CN 2020111625W WO 2021120680 A1 WO2021120680 A1 WO 2021120680A1
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WO
WIPO (PCT)
Prior art keywords
permanent magnet
pole
alternating
motor
rotor core
Prior art date
Application number
PCT/CN2020/111625
Other languages
English (en)
Chinese (zh)
Inventor
李权锋
桂鹏千
史进飞
丁佳婷
马晓皓
Original Assignee
珠海格力电器股份有限公司
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 珠海格力电器股份有限公司 filed Critical 珠海格力电器股份有限公司
Publication of WO2021120680A1 publication Critical patent/WO2021120680A1/fr

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    • 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
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02—Details
    • 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
    • H02K1/2746—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 arranged with the same polarity, e.g. consequent pole type
    • 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 the technical field of electrical equipment, in particular to a motor rotor and an alternating-pole motor.
  • the number of permanent magnets used in alternating-pole permanent magnet synchronous motors is only half of the number of permanent magnets in traditional permanent magnet synchronous motors. Therefore, the permanent magnets are more fully utilized, which can significantly reduce the amount of permanent magnets used, thereby reducing the cost of the motor.
  • the axis of one group of U-phase winding is aligned with the permanent magnet
  • the axis of the other two groups of U-phase winding is also aligned with the permanent magnet
  • the V-phase or W-phase winding is now aligned with the permanent magnet. It can only face the alternating poles, that is, the iron core poles.
  • the three-phase winding magnetic circuit is asymmetrical, which causes the control difficulty to increase, the motor torque fluctuation increases, and the motor performance decreases.
  • the technical problem to be solved by the present disclosure is to provide a motor rotor and an alternating-pole motor, which can reduce control difficulty, reduce motor torque fluctuations, and improve motor performance.
  • the present disclosure provides a motor rotor, including a rotor core, the rotor core includes a first permanent magnetic pole, a second permanent magnetic pole, a first alternating pole and a second alternating pole, the first permanent magnetic pole and the second permanent magnetic pole
  • the magnetic poles are adjacent to form a set of permanent magnetic pole groups.
  • the first and second permanent magnetic poles have opposite polarities.
  • the first and second alternating poles are adjacent to form a set of alternating pole groups.
  • the permanent magnetic pole groups and the alternating pole groups are adjacent to each other.
  • the circumferential direction of the motor rotor is alternately arranged.
  • a first air groove is provided at the location where the first alternating pole and the second alternating pole meet.
  • the first air slot extends along the circumferential direction of the rotor core.
  • the angle formed by the line connecting the two end points of the radially outer side of the first air groove with the center of the rotor core is a1
  • a first installation slot is provided on a permanent magnet pole
  • a second installation slot is provided on the second permanent magnet pole
  • a first permanent magnet is provided in the first installation slot
  • a second permanent magnet is provided in the second installation slot.
  • the angle formed by the line connecting the radially outer end points of the adjacent sides of the magnet and the second permanent magnet with the center of the rotor core is ar, 1 ⁇ a1/ar ⁇ 3.
  • the first permanent magnet pole is provided with a first installation groove
  • the second permanent magnet pole is provided with a second installation groove
  • the first installation groove is provided with a first permanent magnet
  • the second installation groove is provided with a second installation groove.
  • Two permanent magnets in a section perpendicular to the central axis of the rotor core, the angle formed by the line connecting the two end points of the radially outer side of the first permanent magnet and the center of the rotor core is am
  • the second permanent magnet The angle formed by the connection between the two end points of the radially outer side of the magnet and the center of the rotor core is an, the first air slot is close to the radially outer end point of the second permanent magnet and the second permanent magnet is close to the first air
  • the angle formed by the line connecting the radially outer end point of the slot and the center of the rotor core is a1m, where 0.8 ⁇ a1m/am ⁇ 1.1 and 0.8 ⁇ a1m/an ⁇ 1.1.
  • the radial thickness of the first air groove is t1
  • the radial thickness of the first permanent magnet is tm
  • the radial thickness of the second permanent magnet is tn, where 1.2 ⁇ t1/tm ⁇ 2.5.
  • a second air slot is further provided on the rotor core, and the second air slot is provided on the radially inner circumferential side of the first air slot and extends radially toward the center of the rotor core.
  • the air groove communicates with the first air groove.
  • a third air slot is further provided on the rotor core, and the third air slot is connected to the radially inner circumferential side of the second air slot and extends on both sides of the rotor core in the circumferential direction, adjacent to each other.
  • a bridge is formed between the third air grooves.
  • the side extension line of the bridge portion and the radially inner side of the first permanent magnet form an intersection, and the intersection is the dividing point, the first permanent magnet
  • the ratio of the circumferential length on the side of the intersection away from the bridging portion to the total circumferential length of the first permanent magnet is 0.67 to 0.9; the side extension of the bridging portion forms an intersection with the radially inner side of the second permanent magnet, Taking the intersection as the boundary point, the ratio of the circumferential length of the second permanent magnet on the side of the intersection away from the bridge to the total circumferential length of the second permanent magnet is 0.67-0.9.
  • an alternating-pole motor including a motor rotor and a motor stator, and the motor rotor is the above-mentioned motor rotor.
  • the motor stator includes a stator iron core, stator iron cores are provided with stator teeth, and three-phase evenly distributed coil windings are wound on the stator teeth.
  • the motor rotor provided by the present disclosure includes a rotor core.
  • the rotor core includes a first permanent magnetic pole, a second permanent magnetic pole, a first alternating pole, and a second alternating pole.
  • the first permanent magnetic pole and the second permanent magnetic pole are adjacent to each other to form a set Permanent magnet pole group, the polarity of the first permanent magnet pole and the second permanent magnet pole are opposite, the first alternating pole and the second alternating pole are adjacent to form a set of alternating pole group, the permanent magnet pole group and the alternating pole group alternate along the circumferential direction of the motor rotor Set up.
  • the distribution structure of the permanent magnetic poles and the alternating poles is changed, so that the permanent magnetic poles and the alternating poles are alternately arranged in a group along the circumferential direction, and the polarities of the two permanent magnetic poles in a group are opposite, which can make the three
  • the phase winding magnetic circuit is symmetrical, which effectively reduces the difficulty of control, reduces the torque fluctuation of the motor, and improves the performance of the motor.
  • FIG. 1 is a schematic diagram of the structure of a motor rotor of the first embodiment of the disclosure
  • FIG. 2 is a schematic diagram of the structure of the motor rotor of the second embodiment of the disclosure.
  • FIG. 3 is a schematic diagram of the structure of the motor rotor of the third embodiment of the disclosure.
  • FIG. 4 is a schematic diagram of the armature magnetic force line impedance of the motor rotor of the embodiment of the disclosure
  • Fig. 5 is a graph showing the influence of a1/ar of a motor rotor on torque ripple according to an embodiment of the disclosure
  • FIG. 6 is a comparison diagram of current waveforms between the rotor of the electric motor and related technologies according to an embodiment of the disclosure
  • FIG. 7 is a comparison diagram of torque curves between the motor rotor of the embodiments of the disclosure and related technologies.
  • the motor rotor includes a rotor core 1, and the rotor core 1 includes a first permanent magnetic pole 2, a second permanent magnetic pole 3, a first alternating pole 4, and a second Alternating pole 5, the first permanent magnetic pole 2 and the second permanent magnetic pole 3 are adjacent to form a set of permanent magnetic poles, the first permanent magnetic pole 2 and the second permanent magnetic pole 3 are opposite in polarity, the first alternating pole 4 and the second alternating pole 5 are adjacent to each other to form a set of alternating pole groups.
  • the permanent magnet pole groups and the alternating pole groups are alternately arranged along the circumference of the motor rotor.
  • the distribution structure of the permanent magnetic poles and the alternating poles is changed, so that the permanent magnetic poles and the alternating poles are alternately arranged in a group along the circumferential direction, and the polarities of the two permanent magnetic poles in a group are opposite, which can make
  • the three-phase winding magnetic circuit is symmetrical, which effectively reduces the difficulty of control, reduces the torque fluctuation of the motor, and improves the performance of the motor.
  • the first air groove 6 is provided at the location where the first alternating pole 4 and the second alternating pole 5 meet.
  • the installation relationship of permanent magnets is changed, and the installation relationship of permanent magnets is optimized, forming a permanent magnet installation relationship of permanent magnet pole-permanent magnet pole-alternating pole-alternating pole, which is significantly different from the traditional method, so the traditional alternate
  • the optimization strategy of the pole motor is no longer applicable to the optimization of the alternating pole motor of the present disclosure.
  • not only the coordination between adjacent permanent magnetic poles and alternating poles needs to be optimized, but also the relationship between adjacent permanent magnetic poles-permanent magnetic poles and alternating poles-alternating poles and their respective combinations need to be optimized.
  • the first air slot 6 is provided between the adjacent alternating poles, which can adjust the matching of the adjacent alternating poles, so that the distribution of the magnetic field lines is more uniform, and the torque fluctuation is reduced; the alternating poles can be adjusted to the adjacent alternating poles.
  • the permanent magnet pole-permanent magnet pole relationship makes the permanent magnet pole alternate pole more symmetrical overall and reduces the torque fluctuation. It can also adjust the adjacent permanent magnet pole-alternate pole coordination to reduce the torque fluctuation.
  • the first permanent magnet pole 2 is provided with a first installation groove 7
  • the second permanent magnet pole 3 is provided with a second installation groove 8
  • the first installation groove 7 is provided with a first permanent magnet 9
  • the second permanent magnet A second permanent magnet 10 is provided in the installation groove 8.
  • the above-mentioned permanent magnet is made of neodymium iron boron material, for example.
  • the first air groove 6 extends along the circumferential direction of the rotor core 1.
  • the first air groove 6 is, for example, a fan ring segment.
  • the angle formed by the line connecting the two end points of the radially outer side of the first air slot 6 and the center of the rotor core 1 is a1
  • the first permanent magnet The angle formed by the line connecting the radially outer ends of the adjacent sides of 9 and the second permanent magnet 10 with the center of the rotor core 1 is ar, 1 ⁇ a1/ar ⁇ 3.
  • the first air slot 6 is located between two alternating poles of opposite polarity, which is where they demarcate. ar represents the size of the boundary between the two permanent magnets.
  • the angle formed by the line connecting the two end points of the radially outer side of the first permanent magnet 9 and the center of the rotor core 1 is am, and the second permanent magnet
  • the angle formed by the line connecting the two end points of the radially outer side of 10 and the center of the rotor core 1 is an, and the first air slot 6 is close to the radially outer end point of the second permanent magnet 10 and the second permanent magnet 10
  • the included angle formed by the line connecting the radially outer end point of the first air slot 6 and the center of the rotor core 1 is a1m, where 0.8 ⁇ a1m/am ⁇ 1.1 and 0.8 ⁇ a1m/an ⁇ 1.1.
  • the ratio characterizes the width ratio of the adjacent permanent magnet poles to the alternating poles. Within the ratio range, the torque ripple of the motor can be minimized.
  • the radial thickness of the first air groove 6 is t1
  • the radial thickness of the first permanent magnet 9 is tm
  • the radial thickness of the second permanent magnet 10 is tn, where 1.2 ⁇ t1/tm ⁇ 2.5.
  • the rotor core 1 is also provided with a second air slot 11, the second air slot 11 is provided on the radially inner circumferential side of the first air slot 6, and extends in the radial direction toward the center of the rotor core 1.
  • the second air slot 11 The tank 11 communicates with the first air tank 6. Since the magnetic field lines of the permanent magnet always start from the N pole to the S pole, when the permanent magnet installation slots that are far away are not too far apart, there will be a leakage magnetic circuit 1 as shown in FIG. 2, causing a decrease in torque. Providing the second air groove 11 with eyes in the radial direction can cut off the leakage magnetic circuit 1 and greatly increase the output torque of the motor.
  • the second air groove 11 has a decreasing width along the direction away from the first air groove 6 to form a trapezoidal groove structure. At a place far away from the first air groove 6, the width of the second air groove 11 has less influence on the air gap magnetic density, so its width is reduced to improve the mechanical strength.
  • the rotor core 1 is also provided with a third air slot 12, the third air slot 12 is connected to the radially inner circumferential side of the second air slot 11, and extends along the circumferential direction of the rotor core 1 on both sides, adjacent A bridge 13 is formed between the third air grooves 12.
  • a third air slot 12 extending in the circumferential direction is provided on the radially inner peripheral side of the second air slots 11, which can better constrain the direction of the magnetic lines of force, as shown in Figures 2 and As shown in Fig.
  • the magnetic field lines of about the left half are from the N pole to the S surface of the adjacent permanent magnet on the left, and the magnetic field lines of the right half are about It extends from the N pole to the rotor yoke, and then extends radially outward to the adjacent alternating poles, forming an S pole.
  • the second air slot 11 can shorten the length of the part of the magnetic field lines extending to the rotor yoke. The long magnetic circuit will cause the reduction of the utilization rate of the magnetic field lines, and guide the magnetic field lines to the iron core pole on the right side better and faster.
  • the alternating pole motor has the problem of magnetic flux leakage in the rotating shaft, that is, a part of the magnetic field lines emitted by the permanent magnet will enter the rotating shaft of the motor, as shown in the magnetic flux leakage circuit 2.
  • the magnetic field lines entering the motor shaft can be obstructed, and the magnetic field lines entering the motor shaft can be reduced, thereby reducing the magnetic flux leakage problem of the shaft and improving the operating efficiency of the motor.
  • the side extension line of the bridge 13 and the radially inner side of the first permanent magnet 9 form an intersection.
  • the intersection is the dividing point, and the first permanent magnet 9 is located at the intersection.
  • the ratio of the circumferential length of the side away from the bridging portion 13 to the total circumferential length of the first permanent magnet 9 is 0.67 to 0.9;
  • the side extension of the bridging portion 13 and the radially inner side of the second permanent magnet 10 form The intersection point, taking the intersection point as the demarcation point, the ratio of the circumferential length of the second permanent magnet 10 on the side of the intersection away from the bridging portion 13 to the total circumferential length of the second permanent magnet 10 is 0.67-0.9.
  • the magnetic field lines adjusted by the third air slot 12 are mainly the magnetic field lines emitted from the right half of the N pole face of the first permanent magnet in Figure 3, so that it can better enter the adjacent iron core pole, so the third air slot 12 mainly shields It is the magnetic field lines of the right half of the permanent magnet it faces. If the range of intersection A is less than 0.67 of the total circumferential length of the first permanent magnet 9, the right half of the permanent magnet cannot be effectively covered. If the position of the intersection A is greater than 0.9 of the total circumferential length of the first permanent magnet 9, The third air slot 12 will not only cover the right half, but also the left half, because the left half is equivalent to two permanent magnets connected in series to generate magnetic lines of force. The magnetic density is relatively strong.
  • the arrangement relationship between the third air groove 12 and the second permanent magnet 10 is the same as the arrangement relationship between the third air groove 12 and the first permanent magnet 9 and will not be described in detail here.
  • an alternating-pole motor includes a motor rotor and a motor stator, and the motor rotor is the above-mentioned motor rotor.
  • the motor stator includes a stator iron core 14 with stator teeth 15 provided on the stator iron core 14, and three-phase evenly distributed coil windings 16 are wound on the stator teeth 15.
  • the alternating-pole motor is an 18-slot 12-pole motor, and each of the three-phase windings has 6 coils.
  • U1 faces the permanent magnetic poles
  • U2 faces the alternating poles
  • U3 faces the permanent magnetic poles
  • U4 faces the alternating poles
  • U5 faces the permanent magnetic poles
  • U6 faces the alternating poles
  • the V phase is the same as W.
  • the schematic diagram of the winding magnetic circuit is shown in Figure 1 and Figure 4.
  • R permanent magnetic pole represents permanent magnetic pole reluctance
  • R alternate pole represents alternating pole reluctance
  • the current waveform of the motor adopting the motor rotor of the embodiment of the present disclosure is as shown in Fig. 6. It can be clearly seen from the figure that the control current of the motor of the embodiment of the present disclosure has a smaller harmonic content, and the torque curve is compared with, for example, As shown in FIG. 7, the motor of the embodiment of the present disclosure has smaller torque ripple.

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

Abstract

Rotor de moteur et moteur à pôles alternatifs; ledit rotor de moteur comprend un noyau de rotor (1); le noyau de rotor (1) comprend un premier pôle à aimant permanent (2), un second pôle à aimant permanent (3), un premier pôle alternatif (4), et un second pôle alternatif (5); le premier pôle à aimant permanent (2) et le second pôle à aimant permanent (3) sont adjacents, formant un ensemble de pôles à aimant permanent; les polarités du premier pôle à aimant permanent (2) et du second pôle à aimant permanent (3) sont opposées; le premier pôle alternatif (4) et le second pôle alternatif (5) sont adjacents, formant un ensemble de pôles alternatifs; l'ensemble de pôles à aimant permanent et l'ensemble de pôles alternatifs étant agencés en alternance le long de la direction circonférentielle du rotor de moteur. Le rotor de moteur peut réduire la difficulté de commande, réduire l'ondulation de couple moteur et améliorer les performances du moteur.
PCT/CN2020/111625 2019-12-16 2020-08-27 Rotor de moteur et moteur à pôles alternatifs WO2021120680A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201911295317.1A CN110994839B (zh) 2019-12-16 2019-12-16 电机转子和交替极电机
CN201911295317.1 2019-12-16

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WO2021120680A1 true WO2021120680A1 (fr) 2021-06-24

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Cited By (1)

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CN113612362A (zh) * 2021-08-11 2021-11-05 哈尔滨理工大学 复合式交替极永磁游标电机

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Publication number Priority date Publication date Assignee Title
CN110994839B (zh) * 2019-12-16 2020-11-17 珠海格力电器股份有限公司 电机转子和交替极电机
KR20220052215A (ko) * 2020-10-20 2022-04-27 삼성전자주식회사 컨시퀀트 극형 매입 영구자석 모터

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CN113612362B (zh) * 2021-08-11 2024-04-19 哈尔滨理工大学 复合式交替极永磁游标电机

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