WO2012119317A1 - Moteur à aimants permanents triphasé à trois sections en ferrite - Google Patents

Moteur à aimants permanents triphasé à trois sections en ferrite Download PDF

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Publication number
WO2012119317A1
WO2012119317A1 PCT/CN2011/071690 CN2011071690W WO2012119317A1 WO 2012119317 A1 WO2012119317 A1 WO 2012119317A1 CN 2011071690 W CN2011071690 W CN 2011071690W WO 2012119317 A1 WO2012119317 A1 WO 2012119317A1
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WO
WIPO (PCT)
Prior art keywords
phase
ferrite
permanent magnet
magnet motor
motor according
Prior art date
Application number
PCT/CN2011/071690
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English (en)
Chinese (zh)
Inventor
杜坤梅
曹立明
Original Assignee
浙江博望科技发展有限公司
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 浙江博望科技发展有限公司 filed Critical 浙江博望科技发展有限公司
Priority to PCT/CN2011/071690 priority Critical patent/WO2012119317A1/fr
Priority to CN201180052956.0A priority patent/CN103222154B/zh
Publication of WO2012119317A1 publication Critical patent/WO2012119317A1/fr

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    • 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
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles

Definitions

  • This invention relates to a permanent magnet motor, and more particularly to a ferrite three-stage three-phase permanent magnet motor suitable for use in refrigerators, air conditioners, and high speed drive applications.
  • the stator core of a permanent magnet motor generally uses a silicon steel sheet
  • the rotor generally uses a rare earth permanent magnet, such as a neodymium iron boron permanent magnet.
  • Silicon steel sheets and rare earth permanent magnet materials are becoming scarcer and increasingly expensive. In order to change this situation, people have made a lot of efforts.
  • One of the improvements is to use a motor without a stator core, which will inevitably increase the amount of permanent magnets.
  • Another improvement is to use hard ferrite magnet steel, which can avoid the use of rare earth permanent magnet materials, but it will inevitably lead to the magnetic load of the motor becoming lower, and can only be remedied by correspondingly increasing the electric load. Therefore, it is necessary to increase the amount of copper used. The loss of copper is increased, and more importantly, the force index of the motor will be greatly reduced.
  • the present invention solves the problems of large copper consumption and high cost of the conventional permanent magnet motor.
  • the relationship of the width M31 is M11>M21>M31; and the relationship between the outer circular end axial length M12, the inner circular end axial length M22, and the axial center axial length M32 of each tooth is M12>M32
  • the physical air gap between the stator core and the rotor core may be 0.2 to 3.0 mm; the width of the notch between the adjacent two teeth is 0.1 to 3.0 mm.
  • the soft ferrite has a volume resistance of 100 ⁇ to 50 K ⁇ and is selected from the group consisting of a manganese core soft ferrite, a nickel core soft ferrite, a microcrystalline silicon soft ferrite, or an SMC soft.
  • a manganese core soft ferrite a nickel core soft ferrite, a microcrystalline silicon soft ferrite, or an SMC soft.
  • One of the magnetic composite materials is selected from the group consisting of a manganese core soft ferrite, a nickel core soft ferrite, a microcrystalline silicon soft ferrite, or an SMC soft.
  • each of the stator cores is formed by splicing 2X teeth, wherein the remaining surfaces except the splicing surface are covered by an insulating layer having a thickness of 0.02 ⁇ 0.5mm.
  • the stator core is a unitary structure that is prefabricated.
  • Each of the stator cores may be further divided into a plurality of segments in the axial direction, including a front portion forming a front groove at a front portion of the tooth, a rear portion forming a rear groove at a rear portion of the tooth, and a front portion at the front portion At least one intermediate segment between the rear segment
  • three micro-grooves may be uniformly disposed on the inner circular arc of the inner circular end of each of the teeth, and the micro-groove has a groove width of 1 to 2 mm and a groove depth of 0.3 to 2 mm.
  • each permanent magnet on the rotor core is arranged in phase; each of the permanent magnets is a radially magnetized tile-shaped hard ferrite magnet, or a parallel charge.
  • Magnetic tile-shaped hard ferrite magnet steel is
  • the outer circumference of the rotor core may be covered with a carbon fiber, glass fiber or aluminum protective cover having a thickness of 0.15 to 2 mm.
  • the three-phase permanent magnet motor of the present invention has a series of advantages such as minimizing winding end, minimizing air gap, minimizing material, minimizing positioning torque, and minimizing iron loss and copper loss, etc. High operating speeds, higher power/volume ratios and torque/volume ratios minimize costs.
  • This three-phase permanent magnet motor can replace the existing induction motor, permanent magnet motor, or replace the air conditioner and refrigerator compressor drive motor, becoming the mainstream drive motor for high performance, energy saving air conditioner and refrigerator compressor in the future.
  • FIG. 1 is a schematic view showing the structure of a motor assembly in a preferred embodiment of the present invention
  • FIG. 2 is a schematic view showing the structure of a stator and a rotor of a motor A in a preferred embodiment of the present invention
  • Figure 3 is a front elevational view of the single tooth shown in Figure 2;
  • Figure 4 is a left side view of the single tooth shown in Figure 3;
  • Figure 5 is a schematic view showing the structure of a tile-shaped hard ferrite magnetron rotor in a preferred embodiment of the present invention
  • Figure 6 is a schematic view showing the structure of a rotor composed of a radially magnetized hard ferrite magnet block in a preferred embodiment of the present invention
  • Figure 7 is a schematic view showing a micro-groove provided on an inner circular arc of a tooth in another preferred embodiment of the present invention.
  • Figure 8 is a schematic illustration of further dividing each segment of the stator core into three segments in the axial direction in a preferred embodiment of the invention.
  • FIG. 1 shows a preferred embodiment of the present invention.
  • the main components of the ferrite three-phase three-phase permanent magnet motor include a rotor 1, a stator 2, a rotating shaft 30, and the like, and a physical gas between the rotor 1 and the stator 2.
  • the gap 5 is 0.1 to 2 mm.
  • the stator core is a three-stage structure made of soft ferrite, and the three-phase windings of A, B and C each occupy the first, second and third sections;
  • the phase A is taken as an example.
  • the relationship between the width M11 of the outer circular end 50 of each of the teeth 40, the width M21 of the inner circular end 60, and the width M31 of the tooth core 70 is M11>M21>M31; and each tooth
  • the axial length M12 of the outer end 50, the axial length M22 of the inner circular end 60, and the axial length M32 of the tooth center 70 are M12>M32, M22>M32; thus, both in the axial direction and the radial direction of the tooth.
  • phase A there are twelve concentrated windings in phase A, which are wound around twelve teeth, and the winding connection mode of phase A winding is A ⁇ /A ⁇ A ⁇ /A ⁇ A ⁇ /A ⁇ /A ⁇ A ⁇ /A ⁇ /A ⁇ /A ⁇ /A ⁇ /A.
  • the "/A" therein represents a concentrated winding of an inverting connection of phase A.
  • the second and third stages of the stator core and the winding structure of the B and C phase windings are the same as the A phase, and the spatial phases of the three-phase stator cores of the A, B, and C are 120° electrical angles.
  • the winding connection mode of the B-phase winding is B ⁇ /B ⁇ B ⁇ /B ⁇ B ⁇ /B ⁇ B ⁇ /B ⁇ B ⁇ /B ⁇ B ⁇ /B ⁇ /B ⁇ /B;
  • the winding connection mode of the C-phase winding is C ⁇ /C ⁇ C ⁇ /C ⁇ C ⁇ /C ⁇ C ⁇ /C ⁇ C ⁇ /C ⁇ C ⁇ /C ⁇ C ⁇ /C ⁇ /C ⁇ /C ⁇ /C.
  • the conventional motor has a total length of 12N (D + 2 flopD / 12) per phase winding; therefore, the winding wire in this embodiment is shortened by 1.207 times.
  • the rotor uses hard ferrite, avoiding the use of rare earth permanent magnet materials, although the magnetic load of the motor is reduced by 2 times, it is necessary to increase the electric load by 2 times to remedy the motor performance, but the total length of the winding is shortened by 1.207 times, the motor The copper loss will be reduced by 1.458 times; and because the stator of the motor uses soft ferrite, the iron loss of the motor will be reduced by 3 to 10 times.
  • the integrated loss of this motor and the traditional concentrated winding three-phase permanent magnet motor Quite, even smaller; and because the magnetic load of the motor is reduced by 2 times, the positioning torque and torque fluctuation of the motor is 20 ⁇ 30% smaller than that of the traditional concentrated winding motor, and the noise is smaller than that of the traditional concentrated winding motor; Small, it is more advantageous to reduce the internal resistance of the motor.
  • stator core is made of soft ferrite and operates at frequencies up to 10 kHz, it allows the motor to rotate at tens of thousands of revolutions per minute, which makes sense for high speed applications.
  • the motor can be driven with a three-phase square wave or sinusoidal current.
  • the remaining surfaces except the splicing surface are covered by the insulating layer, and the thickness of the insulating layer may be 0.02-0.5 mm, after splicing into two, adjacent two
  • the width of the notch 3 between the teeth is 0.1 to 3.0 mm.
  • the volume resistance of the soft ferrite can be 100 ⁇ to 50 K ⁇ , so the core loss of the soft ferrite stator is 3 to 10 times or more smaller than that of the silicon steel sheet stator core.
  • the soft ferrite here may be made of one of a manganese core soft ferrite, a nickel core soft ferrite, a microcrystalline silicon soft ferrite, or an SMC soft magnetic composite material, and the saturation magnetic density thereof is inevitably not Will be lower than the residual magnetic flux of the permanent ferrite, they are naturally matched.
  • a single independent tooth can be formed by a certain process in a sintering process, a bonding process, an injection process, or a mixing process, and the forward or reverse can be wound for each tooth.
  • the windings in series are then spliced into a unitary stator core assembly.
  • three inner grooves are uniformly disposed on the inner circular arc of each of the teeth, and the groove width is 1 to 2 mm, and the groove depth is 0.3 to 2 mm.
  • stator core in which case there are no separate teeth
  • integral prefabrication it is also possible to manufacture a length of stator core (in which case there are no separate teeth) by means of integral prefabrication, and then directly use a shuttle or hand-wound three-phase winding on the integral stator core.
  • the N and S magnetic poles of the respective permanent magnets on the rotor core are arranged, and the permanent magnets here are radially magnetized tile-shaped hard ferrite magnets or parallel magnetized.
  • Tile-shaped hard ferrite magnet steel It can be seen from the figure that the outer circumference of the ferrite magnet has a chamfer angle of not more than 15° and a length not larger than 1/4 of the outer arc of the ferrite magnet, as shown in Fig. 5.
  • the motor's rotor has the same direct-axis reluctance and cross-axis reluctance, and belongs to a hidden pole motor. The running noise of this motor is smaller than that of a salient pole motor.
  • the permanent magnet is a radially magnetized hard ferrite magnet block having a pole pitch of ⁇ D/12 and an axial physical dimension L of 30 to 200 mm, wherein D is outside the rotor.
  • the outer diameter of the magnetic block is ⁇ D/12
  • the direct magnetoresistance of the rotor is larger than the cross-axis reluctance and has a salient pole effect.
  • the motor can obtain salient pole torque during operation, and the output is larger than that of the hidden pole motor.
  • a protective sleeve having a thickness of 0.15-2 mm is sleeved on the outer circumference of the rotor, and the protective sleeve can be made of carbon fiber, glass filament or aluminum, and can be prevented from rotating on the rotor when the motor rotates at a high speed.
  • the permanent magnet centrifugal force is too large to fall off.
  • each segment of the stator core is further divided into three sections in the axial direction, including a front section (left side section in FIG. 8) forming a front groove at a front portion of the tooth,
  • the rear portion of the tooth forms a rear section of the rear groove (the right side section in Fig. 8), and an intermediate section (the middle section in Fig. 8) between the front and rear sections.
  • the number of intermediate segments may be one or more; when the lengths of the current segment and the rear segment are fixed, the axis of the entire stator core can be adjusted by increasing the number of intermediate segments or adjusting the length of the intermediate segment. To the length.
  • the axial segmented structure can be applied to the case where a plurality of teeth shown in FIG. 2 are spliced into a stator core, that is, each tooth in each segment of the stator core is divided into a plurality of segments, and the figure is shown in FIG. 4
  • the corresponding left-side structure of a single tooth, its main view structure is shown in Figure 3; of course, this axial segmented structure can also be applied to the overall prefabricated stator core, in this case, the overall pre-fabrication of multiple segments.
  • the ferrite three-stage three-phase permanent magnet motor in the above embodiment is generally used as an electric motor and is driven by a three-phase square wave or sine wave current; it is suitable for refrigerators, air conditioners, and high-speed driving applications; when it is driven by a rotating machine, It can also be a three-phase permanent magnet generator.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

L'invention concerne un moteur à aimants permanents triphasé à trois sections en ferrite dans lequel le noyau en fer du stator comprend une structure en trois sections faite de ferrite magnétique molle, chacun des trois enroulements de phase A, B, C occupant une section. Le nombre de fentes dans le noyau en fer du stator est Z, le nombre de pôles magnétiques du rotor est 2P, avec Z=2P=2X, où X=5,6,7,...20. Plusieurs fentes pour recevoir les enroulements sont formées à l'avant et à l'arrière et à gauche et à droite de chaque dent. Chaque phase comprend 2X enroulements concentrés qui sont disposés circulairement selon l'ordre de A->/A. La phase B et la phase C ont la même structure et les phases d'espace des noyaux en fer du stator à trois phases A, B, C diffèrent les unes des autres selon un angle électrique de 120°. Le moteur a pour avantages une extrémité d'enroulement réduite, un faible couple de positionnement, une moindre concentration en cuivre et en fer, etc.
PCT/CN2011/071690 2011-03-10 2011-03-10 Moteur à aimants permanents triphasé à trois sections en ferrite WO2012119317A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2011/071690 WO2012119317A1 (fr) 2011-03-10 2011-03-10 Moteur à aimants permanents triphasé à trois sections en ferrite
CN201180052956.0A CN103222154B (zh) 2011-03-10 2011-03-10 铁氧体三段式三相永磁电机

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2011/071690 WO2012119317A1 (fr) 2011-03-10 2011-03-10 Moteur à aimants permanents triphasé à trois sections en ferrite

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WO2012119317A1 true WO2012119317A1 (fr) 2012-09-13

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5936325A (en) * 1996-12-31 1999-08-10 Valeo Electronique Synchronous type electrical machine
CN1502160A (zh) * 2001-01-04 2004-06-02 ��Ĭ���� 用于开关磁阻电机的端帽组件
CN1853329A (zh) * 2003-09-16 2006-10-25 本田技研工业株式会社 凸极式电动机的定子
WO2007024184A1 (fr) * 2005-08-26 2007-03-01 Höganäs Ab Ensemble de machine électrique
US20070296298A1 (en) * 2006-05-10 2007-12-27 Jones Robert M Electric machine having segmented stator
CN201113738Y (zh) * 2007-09-29 2008-09-10 张振声 独立极轴向分相的开关磁阻电机
CN101980433A (zh) * 2010-11-22 2011-02-23 沈阳工业大学 周向移相轴向分段的楔形定子铁芯外永磁转子同步电机

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202068244U (zh) * 2011-03-11 2011-12-07 浙江博望科技发展有限公司 铁氧体三段式三相永磁电机

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5936325A (en) * 1996-12-31 1999-08-10 Valeo Electronique Synchronous type electrical machine
CN1502160A (zh) * 2001-01-04 2004-06-02 ��Ĭ���� 用于开关磁阻电机的端帽组件
CN1853329A (zh) * 2003-09-16 2006-10-25 本田技研工业株式会社 凸极式电动机的定子
WO2007024184A1 (fr) * 2005-08-26 2007-03-01 Höganäs Ab Ensemble de machine électrique
US20070296298A1 (en) * 2006-05-10 2007-12-27 Jones Robert M Electric machine having segmented stator
CN201113738Y (zh) * 2007-09-29 2008-09-10 张振声 独立极轴向分相的开关磁阻电机
CN101980433A (zh) * 2010-11-22 2011-02-23 沈阳工业大学 周向移相轴向分段的楔形定子铁芯外永磁转子同步电机

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CN103222154B (zh) 2016-03-02
CN103222154A (zh) 2013-07-24

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