CN109660042B - Series hybrid permanent magnet variable-flux motor - Google Patents
Series hybrid permanent magnet variable-flux motor Download PDFInfo
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- CN109660042B CN109660042B CN201910041163.7A CN201910041163A CN109660042B CN 109660042 B CN109660042 B CN 109660042B CN 201910041163 A CN201910041163 A CN 201910041163A CN 109660042 B CN109660042 B CN 109660042B
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- 230000004907 flux Effects 0.000 claims abstract description 24
- 230000005415 magnetization Effects 0.000 claims abstract description 16
- 230000000694 effects Effects 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract 3
- 238000002955 isolation Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 abstract description 2
- 230000005389 magnetism Effects 0.000 description 98
- 230000005347 demagnetization Effects 0.000 description 11
- 230000001965 increasing effect Effects 0.000 description 8
- 230000003993 interaction Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 3
- 230000003313 weakening effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
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- Engineering & Computer Science (AREA)
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
本发明公开了一种串联型混合永磁变磁通电机，包括定子(100)、绕于该定子(100)上的电枢绕组(200)及转子铁芯(300)，所述转子铁芯(300)的每个极下设有三个不直接接触、分开放置的永磁体，其中第二永磁体(302)呈“一”形放置于外侧，两个第一永磁体(301)呈“V”形放置于内侧，所述第二永磁体(302)为高矫顽力永磁体或低矫顽力永磁体，所述第一永磁体(301)为高矫顽力永磁体或低矫顽力永磁体。本发明的电机，低矫顽力永磁体和高矫顽力永磁体采用特殊的放置位置及方式，使得该电机为磁路串联型结构，高矫顽力永磁体对低矫顽力永磁体起增磁作用，提高了低矫顽力永磁体的工作点和磁化程度，提高转矩输出能力，降低了电机的充磁电流。
The invention discloses a series-type hybrid permanent magnet variable magnetic flux motor, comprising a stator (100), an armature winding (200) wound on the stator (100), and a rotor iron core (300), the rotor iron core Each pole of (300) is provided with three permanent magnets that are not in direct contact and are placed separately, wherein the second permanent magnet (302) is placed on the outside in the shape of a "one", and the two first permanent magnets (301) are placed in the shape of "V". ” shape is placed on the inside, the second permanent magnet (302) is a high-coercivity permanent magnet or a low-coercivity permanent magnet, and the first permanent magnet (301) is a high-coercivity permanent magnet or a low-coercivity permanent magnet force permanent magnet. In the motor of the present invention, the low-coercivity permanent magnets and the high-coercivity permanent magnets adopt special placement positions and methods, so that the motor has a magnetic circuit series structure, and the high-coercivity permanent magnets act on the low-coercivity permanent magnets. The magnetizing effect improves the working point and magnetization degree of the low-coercivity permanent magnet, improves the torque output capability, and reduces the magnetizing current of the motor.
Description
Technical Field
The invention belongs to the technical field of hybrid permanent magnet motors, and particularly relates to a series hybrid permanent magnet variable reluctance motor.
Background
In recent years, permanent magnet synchronous motors are widely applied to the fields of traffic, industry, national defense and the like due to the characteristics of high efficiency, high power density, good mechanical characteristics and the like. However, as the application field expands, the conventional permanent magnet synchronous motor also has some disadvantages. The magnetizing state of a permanent magnet in a traditional permanent magnet motor is difficult to change, and no-load counter electromotive force can be increased along with the increase of the rotating speed. Because the terminal voltage of the motor in operation can not exceed the voltage limit value output by the inverter, continuous field weakening control is required in a high-speed interval, namely, the permanent magnet magnetomotive force is counteracted by increasing the demagnetizing current component of the direct axis, the terminal voltage is ensured to be lower than the voltage limit value of the inverter, and the purpose of field weakening and speed expansion is achieved. However, this method still has disadvantages: firstly, the permanent magnet has larger magnetic resistance and smaller direct-axis inductance, so that larger weak magnetic current is needed, the weak magnetic capacity is limited, and the speed regulation range of the motor is narrower; secondly, extra copper loss is introduced into the weak magnetic current, the copper loss is in direct proportion to the square of the current, the amplitude of the weak magnetic current is increased along with the increase of the rotating speed, the loss caused by the weak magnetic is obviously improved, and the efficiency of the motor is reduced; thirdly, the increase of the field weakening current tends to reduce the torque current component due to the limitation of the inverter capacity, thereby reducing the torque output capacity of the motor in a high-speed region.
Then, researchers have proposed a variable-magnetization motor (i.e., "a memory motor"), which uses a low-coercivity permanent magnet and changes the magnetization degree of the permanent magnet by applying a direct-axis pulse current to magnetize and demagnetize the permanent magnet, thereby realizing flexible adjustment of the air-gap magnetic field strength. The motor does not need to continuously apply extra weak magnetic current, can obtain a wider speed regulation range, and still has higher efficiency in the wide speed regulation range. However, since the low coercive force permanent magnet has a low magnetic energy product, the torque density of a variable reluctance motor using only a single low coercive force permanent magnet is low.
Accordingly, another inventor has proposed a hybrid permanent magnet flux machine that uses both high coercive force permanent magnets and low coercive force permanent magnets to improve torque density while maintaining the flux regulating characteristics. The hybrid permanent magnet variable reluctance motor can be divided into a parallel type and a series type according to the difference of magnetic circuits. In the parallel hybrid permanent magnet variable-magnetization motor, the high-coercivity permanent magnet plays a role in demagnetization of the low-coercivity permanent magnet, and the working point of the low-coercivity permanent magnet is low, so that the torque density of the motor is not high, and the current required for magnetizing the low-coercivity permanent magnet is very large, namely, the magnetization is difficult. These disadvantages limit the application of the parallel type hybrid permanent magnet flux machine.
The other type is a series hybrid permanent magnet variable reluctance motor, the permanent magnet of the motor consists of two permanent magnets with high coercive force and low coercive force, and the two permanent magnets are in direct contact and are attached to form a whole body for placement. The air gap magnetic flux is changed by adjusting the magnetization state of the low-coercivity permanent magnet. However, in such a structure, the high coercivity permanent magnet and the low coercivity permanent magnet are directly attached to each other, and the magnetic flux passing through the high coercivity permanent magnet passes through the low coercivity permanent magnet, so that the high coercivity permanent magnet has a very strong magnetizing effect on the low coercivity permanent magnet, which results in a large current required for demagnetizing the low coercivity permanent magnet and a narrow field modulation range. In order to increase the field control range, the thickness ratio of the low coercive force permanent magnet to the high coercive force permanent magnet can only be increased, but the required magnetizing and demagnetizing current can be further increased. And the direct-axis magnetic resistance and the quadrature-axis magnetic resistance of the rotor with the structure are large, the direct-axis inductance and the quadrature-axis inductance are small and have small difference, namely the salient pole ratio is small, the reluctance torque is small, and therefore the torque density of the motor is still not high enough.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a series-connection type hybrid permanent magnet variable reluctance motor, which aims to adopt special placing positions and modes for a low-coercivity permanent magnet and a high-coercivity permanent magnet, so that the motor is of a magnetic circuit series-connection type structure, the high-coercivity permanent magnet plays a role in magnetizing the low-coercivity permanent magnet, the working point and the magnetization degree of the low-coercivity permanent magnet are improved, the torque output capability is improved, and the magnetizing current of the motor is reduced.
In order to achieve the above object, the present invention provides a series hybrid permanent magnet flux-switching motor, comprising a stator, an armature winding wound around the stator, and a rotor core, wherein the stator and the rotor core are arranged coaxially in a radial direction,
three permanent magnets which are not in direct contact and are separately arranged below each pole of the rotor core, wherein the second permanent magnet is arranged on the outer side in a straight shape, the two first permanent magnets are arranged on the inner side in a V shape, the three permanent magnets form an inverted triangle structure, and the first permanent magnet and the second permanent magnet are both vertically magnetized;
the second permanent magnet placed in the shape of 'one' is a high-coercivity permanent magnet or a low-coercivity permanent magnet, the first permanent magnet placed in the shape of 'V' is a high-coercivity permanent magnet or a low-coercivity permanent magnet, and the second permanent magnet placed in the shape of 'one' is different from the first permanent magnet placed in the shape of 'V'.
Furthermore, a first magnetism isolating groove and a second magnetism isolating groove are arranged at two ends of the first-shaped second permanent magnet;
and one end of the V-shaped first permanent magnet, which is close to the air gap, is respectively provided with a third magnetism isolating groove and a fourth magnetism isolating groove, and the opposite end of the V-shaped first permanent magnet is respectively provided with a fifth magnetism isolating groove and a sixth magnetism isolating groove.
Furthermore, the third magnetism isolating groove and the fourth magnetism isolating groove are of rectangular structures, one end of each magnetism isolating groove is connected with the end of the V-shaped first permanent magnet, and the other end of each magnetism isolating groove is arranged corresponding to the first magnetism isolating groove and the second magnetism isolating groove respectively, so that magnetic leakage of the first permanent magnet and the second permanent magnet is reduced.
Furthermore, the first magnetism isolating groove and the second magnetism isolating groove are of a trapezoidal structure, and the third magnetism isolating groove and the fourth magnetism isolating groove are of a rectangular structure;
one side of the first magnetism isolating groove is opposite to one side of the fourth magnetism isolating groove, and one side of the second magnetism isolating groove is opposite to one side of the third magnetism isolating groove, so that the width of a magnetic bridge between the first permanent magnet and the second permanent magnet is adjusted; and the number of the first and second electrodes,
the width of the magnetic bridge between the first magnetism isolating groove and the fourth magnetism isolating groove, and between the second magnetism isolating groove and the third magnetism isolating groove is 1.0-3.0 mm.
Further, the first magnetism isolating groove and the second magnetism isolating groove are of triangular structures, and the third magnetism isolating groove and the fourth magnetism isolating groove are of baseball-bar-shaped structures;
one side edge of the first magnetism isolating groove is opposite to one side edge of the fourth magnetism isolating groove;
one side edge of the second magnetism isolating groove is opposite to one side edge of the third magnetism isolating groove; and the number of the first and second electrodes,
the width of the magnetic bridge between the first magnetism isolating groove and the fourth magnetism isolating groove, and between the second magnetism isolating groove and the third magnetism isolating groove is 1.0-3.0 mm.
Further, the first permanent magnet of the "V" shape placement is a high coercivity permanent magnet, and the second permanent magnet of the "one" shape placement is a low coercivity permanent magnet.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1. according to the series hybrid permanent magnet variable-magnetization energizing motor, the low-coercivity permanent magnet and the high-coercivity permanent magnet are placed at special positions and in special modes, so that the motor is of a magnetic circuit series structure, the high-coercivity permanent magnet plays a role in magnetizing the low-coercivity permanent magnet, the working point and the magnetization degree of the low-coercivity permanent magnet are improved, the torque output capability is improved, and the magnetizing current of the motor is reduced.
2. According to the series hybrid permanent magnet variable reluctance motor, the designed rotor structure has the advantages that the direct axis reluctance is larger than the quadrature axis reluctance, the salient pole ratio is large, and high reluctance torque can be obtained, so that the torque density of the motor is improved.
3. According to the series hybrid permanent magnet variable-magnetization energizing machine, the low-coercivity permanent magnet is placed on the outer side in a linear shape, the armature magnetic field has a stronger effect on the low-coercivity permanent magnet, so that the low-coercivity permanent magnet is easier to magnetize and demagnetize, and the magnetization degree of the permanent magnet is more uniform after the magnetization and demagnetization; the high-coercivity permanent magnet is placed on the inner side in a V shape, so that the torque density of the motor can be improved.
4. According to the series hybrid permanent magnet variable-reluctance motor, the two permanent magnets are separately arranged, so that the magnetic flux passing through the low-coercivity permanent magnet is greatly reduced, the magnetizing effect of the high-coercivity permanent magnet on the low-coercivity permanent magnet is weakened, the magnetomotive force required by the low-coercivity permanent magnet during demagnetization is reduced, and the current required by demagnetization is reduced.
5. The invention relates to a series-connection type hybrid permanent magnet variable-flux motor, wherein a first magnetism-isolating groove and a second magnetism-isolating groove are arranged at two ends of a first-shaped second permanent magnet, a V-shaped first permanent magnet comprises two permanent magnets arranged at a certain angle, a third magnetism-isolating groove and a fourth magnetism-isolating groove are respectively arranged at one ends of the permanent magnets, which are close to an air gap, and a fifth magnetism-isolating groove and a sixth magnetism-isolating groove are respectively arranged at the opposite ends of the permanent magnets and are used for adjusting the width of a magnetic bridge between a high-coercivity permanent magnet and a low-coercivity permanent magnet. The interaction strength between the two permanent magnets is moderate, a large magnetic regulation range can be obtained under the condition that the thicknesses of the low-coercivity permanent magnet and the high-coercivity permanent magnet are small, and the demagnetization current of the motor can be reduced.
Drawings
FIG. 1 is a schematic structural diagram of a series hybrid permanent magnet flux machine according to the present invention;
fig. 2 is a schematic view of a structure and magnetic lines of a series hybrid permanent magnet flux-changing motor according to a first embodiment of the present invention;
FIG. 3 is an enlarged view of a permanent magnet according to a first embodiment of the present invention;
fig. 4 is a schematic view of a structure and magnetic lines of a second embodiment of a series hybrid permanent magnet flux-changing motor according to the present invention;
FIG. 5 is an enlarged view of a permanent magnet according to a second embodiment of the present invention;
fig. 6 is a schematic view of a structure and magnetic lines of a third embodiment of a series hybrid permanent magnet flux-changing motor according to the present invention;
FIG. 7 is an enlarged view of a permanent magnet according to a third embodiment of the present invention;
fig. 8 is a schematic view of a structure and magnetic lines of a fourth embodiment of a series hybrid permanent magnet flux machine according to the present invention;
fig. 9 is an enlarged schematic view of a part of four permanent magnets according to an embodiment of the present invention.
In all the figures, the same reference numerals denote the same features, in particular: 100-stator, 200-armature winding, 300-rotor core, 301-first permanent magnet, 302-second permanent magnet, 3021-first magnetism isolating groove, 3022-second magnetism isolating groove, 3011-third magnetism isolating groove, 3012-fifth magnetism isolating groove, 3013-sixth magnetism isolating groove, 3014-fourth magnetism isolating groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In a series-connection type hybrid permanent magnet variable-reluctance motor, if a high-coercivity permanent magnet and a low-coercivity permanent magnet are directly attached to each other, magnetic flux passing through the high-coercivity permanent magnet can completely pass through the low-coercivity permanent magnet, and the high-coercivity permanent magnet plays a very strong role in increasing magnetism of the low-coercivity permanent magnet. When the low-coercivity permanent magnet is demagnetized, a large magnetomotive force is needed, so that the current needed by demagnetization is large and the magnetic regulation range is narrow. In order to increase the field control range, the thickness ratio of the low coercive force permanent magnet to the high coercive force permanent magnet can only be increased, but the required magnetizing and demagnetizing current can be further increased.
In order to solve the above problems, the present invention provides a series hybrid permanent magnet flux machine, as shown in fig. 1, the machine includes a stator 100, an armature winding 200 wound on the stator, and a rotor core 300; the stator 100 and the rotor core 200 are arranged radially and coaxially. The rotor structure designed by the invention has the advantages that the direct-axis magnetic resistance is greater than the quadrature-axis magnetic resistance, so that the direct-axis inductance is smaller than the quadrature-axis inductance, the salient pole ratio is higher, and higher magnetic resistance torque can be obtained, thereby improving the torque density of the motor.
Three permanent magnets which are not in direct contact and are separately arranged below each pole of the rotor core 300 are arranged, wherein the second permanent magnet 302 is arranged on the outer side in a straight shape, the two first permanent magnets 301 are arranged on the inner side in a V shape, the three permanent magnets form an inverted triangle, and the permanent magnets are vertically magnetized. The "one" shaped permanent magnet 302 is a high coercivity permanent magnet or a low coercivity permanent magnet, the "V" shaped permanent magnet 301 is a high coercivity permanent magnet or a low coercivity permanent magnet, and the "one" shaped permanent magnet 302 is of a different type than the "V" shaped permanent magnet 301.
In a preferred embodiment of the invention, the low coercivity permanent magnet thickness is greater than the high coercivity permanent magnet thickness.
In a preferred embodiment of the invention, the "V" shaped first permanent magnet 301 is a high coercivity permanent magnet and the "one" shaped second permanent magnet 302 is a low coercivity permanent magnet.
In the first embodiment shown in fig. 2, the "one" -shaped permanent magnet 302 is a low-coercive-force permanent magnet, and the "V" -shaped permanent magnet 301 is a high-coercive-force permanent magnet. As can be seen from the magnetic lines of force, the magnetic circuit of the motor is still in a series structure, and the characteristics of high torque density and low magnetizing current of the series motor are reserved. As shown in fig. 3, in the preferred embodiment of the present invention, a first magnetism isolating groove 3021 and a second magnetism isolating groove 3022 are provided at both ends of the "one" shaped second permanent magnet 302, a third magnetism isolating groove 3011 and a fourth magnetism isolating groove 3014 are provided at one end of the "V" shaped first permanent magnet 301 close to the air gap, a fifth magnetism isolating groove 3012 and a sixth magnetism isolating groove 3013 are provided at the opposite end of the "V" shaped first permanent magnet 301, respectively, for adjusting the width of the magnetic bridge between the high coercivity permanent magnet and the low coercivity permanent magnet. Preferably, the first magnetism isolating groove 3021, the second magnetism isolating groove 3022, the third magnetism isolating groove 3011, the fourth magnetism isolating groove 3014, and the fifth magnetism isolating groove 3012 and the sixth magnetism isolating groove 3013 are all triangular structures. The two permanent magnets are separately arranged, so that the magnetic flux passing through the low-coercivity permanent magnet is greatly reduced, the magnetizing effect of the high-coercivity permanent magnet on the low-coercivity permanent magnet is weakened, and the magnetomotive force required when the low-coercivity permanent magnet is demagnetized is reduced, namely the current required by demagnetization is reduced.
In the second embodiment shown in fig. 4 and 5, a first magnetism isolating groove 3021 and a second magnetism isolating groove 3022 are arranged at two ends of the "first" shaped second permanent magnet 302, a third magnetism isolating groove 3011 and a fourth magnetism isolating groove 3014 are respectively arranged at one end of the "V" shaped first permanent magnet 301 close to the air gap, and a fifth magnetism isolating groove 3012 and a sixth magnetism isolating groove 3013 are respectively arranged at the opposite end of the "V" shaped first permanent magnet 301. Wherein, third magnetism-isolating groove 3011 and fourth magnetism-isolating groove 3014 are the rectangle structure, its one end and the first permanent magnet 301 end connection of "V" shape, the other end respectively with first magnetism-isolating groove 3021, second magnetism-isolating groove 3022 correspond the setting to adjust the magnetic bridge width between first permanent magnet 301 and the second permanent magnet 302, reduced the magnetic leakage of permanent magnet, improved torque output ability. At the moment, the magnetizing effect of the high-coercivity permanent magnet on the low-coercivity permanent magnet is weaker, and the working point of the low-coercivity permanent magnet is very low when the motor is at the lowest magnetization degree, so that the lowest magnetization degree of the motor can be reached only when the low-coercivity permanent magnet needs to be demagnetized to have very low magnetic flux density, and the demagnetization current is still large.
In the third embodiment shown in fig. 6 and 7, a first magnetism isolating groove 3021 and a second magnetism isolating groove 3022 are arranged at two ends of the "one" -shaped second permanent magnet 302, a third magnetism isolating groove 3011 and a fourth magnetism isolating groove 3014 are respectively arranged at one end of the "V" -shaped first permanent magnet 301 close to the air gap, and a fifth magnetism isolating groove 3012 and a sixth magnetism isolating groove 3013 are respectively arranged at the opposite end of the "V" -shaped first permanent magnet 301. The first magnetism isolating groove 3021 and the second magnetism isolating groove 3022 are of a trapezoidal structure, the third magnetism isolating groove 3011 and the fourth magnetism isolating groove 3014 are of a rectangular structure, one side of the first magnetism isolating groove 3021 is arranged opposite to one side of the fourth magnetism isolating groove 3014, and one side of the second magnetism isolating groove 3022 is arranged opposite to one side of the third magnetism isolating groove 3011; and the width of the magnetic bridge between the first magnetism isolating groove 3021 and the fourth magnetism isolating groove 3014, and between the second magnetism isolating groove 3022 and the third magnetism isolating groove 3011 is 1.0-3.0 mm.
As shown in fig. 7, due to the presence of the magnetic isolation slots and the small width of the magnetic bridge between the two slots, most of the magnetic flux generated by the high-coercivity permanent magnet passes through the low-coercivity permanent magnet, and only a small part of the magnetic flux passes through the magnetic bridge, so that the interaction between the two permanent magnets is enhanced in the third embodiment compared with the second embodiment shown in fig. 5. The interaction between the two permanent magnets can be properly enhanced by arranging the magnetism isolating groove, and the interaction strength between the two permanent magnets is adjusted, so that the interaction strength between the two permanent magnets is moderate. In the third embodiment, when the motor is at the lowest magnetization degree, the working point of the low-coercivity permanent magnet is higher, and the lowest magnetization degree of the motor can be reached without demagnetizing the low-coercivity permanent magnet to a small magnetic flux density, so that the demagnetization current of the motor can be reduced although the magnetization effect of the high-coercivity permanent magnet on the low-coercivity permanent magnet is slightly enhanced. Compared with the second embodiment shown in fig. 4, the third embodiment shown in fig. 6 has less change of the main magnetic circuit and less change of the main magnetic flux, so that the third embodiment maintains a larger field regulating range in the second embodiment, and simultaneously reduces the demagnetization current of the motor.
In the fourth embodiment shown in fig. 8, a first magnetism isolating groove 3021 and a second magnetism isolating groove 3022 are provided at two ends of the "one" -shaped second permanent magnet 302, a third magnetism isolating groove 3011 and a fourth magnetism isolating groove 3014 are provided at one end of the "V" -shaped first permanent magnet 301 close to the air gap, and a fifth magnetism isolating groove 3012 and a sixth magnetism isolating groove 3013 are provided at the opposite end of the "V" -shaped first permanent magnet 301. The first magnetism isolating groove 3021 and the second magnetism isolating groove 3022 are triangular structures, the third magnetism isolating groove 3011 and the fourth magnetism isolating groove 3014 are baseball-bar-shaped structures, one side of the first magnetism isolating groove 3021 is arranged opposite to one side of the fourth magnetism isolating groove 3014, and one side of the second magnetism isolating groove 3022 is arranged opposite to one side of the third magnetism isolating groove 3011; and the width of the magnetic bridge between the first magnetism isolating groove 3021 and the fourth magnetism isolating groove 3014, and between the second magnetism isolating groove 3022 and the third magnetism isolating groove 3011 is 1.0-3.0 mm, and the width of the magnetic bridge is smaller by adjusting the opening angle of the V-shaped groove. As can be seen from fig. 9, most of the magnetic flux generated by the high coercive force permanent magnet passes through the low coercive force permanent magnet, and only a small part of the magnetic flux passes through the magnetic bridge, so that the effects of enhancing the interaction between the two permanent magnets and adjusting the strength of the interaction are also achieved.
The low-coercivity permanent magnet is placed on the outer side in a linear shape, the armature magnetic field has stronger effect on the low-coercivity permanent magnet, so that the low-coercivity permanent magnet is easier to magnetize and demagnetize, and the magnetization degree of the permanent magnet is more uniform after the magnetization and demagnetization. The high-coercivity permanent magnet is placed on the inner side in a V shape, so that the torque density of the motor can be improved.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
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| CN110277848A (en) * | 2019-07-08 | 2019-09-24 | 广东工业大学 | A built-in permanent magnet synchronous motor |
| CN110233530B (en) * | 2019-07-17 | 2025-03-28 | 上海川也电机有限公司 | U-shaped composite permanent magnet motor |
| CN110277851A (en) * | 2019-07-23 | 2019-09-24 | 中达电机股份有限公司 | Mixed magneto rotor and its mixed magneto |
| JP7299531B2 (en) * | 2019-09-30 | 2023-06-28 | ダイキン工業株式会社 | rotor, motor |
| CN111756145B (en) * | 2020-07-08 | 2022-09-09 | 上海交通大学 | Dual-phase winding variable magnetic flux memory motor, motor system and control method thereof |
| CN113472170B (en) * | 2021-08-05 | 2022-12-06 | 威海西立电子股份有限公司 | Variable magnetic flux permanent magnet synchronous motor, control method and control system |
| CN119582480A (en) * | 2023-09-07 | 2025-03-07 | 广东美芝制冷设备有限公司 | Motors, compressors and refrigeration equipment |
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| JP2006314152A (en) * | 2005-05-06 | 2006-11-16 | Nissan Motor Co Ltd | Permanent-magnet motor |
| JP2008067474A (en) * | 2006-09-06 | 2008-03-21 | Mitsui High Tec Inc | Rotor |
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| CN106451851A (en) * | 2016-10-31 | 2017-02-22 | 上海电机学院 | Permanent magnet synchronous motor hybrid excitation structure |
| CN206962565U (en) * | 2017-06-23 | 2018-02-02 | 上海工程技术大学 | A kind of combined magnetic circuit permagnetic synchronous motor and combined magnetic circuit permanent-magnetic synchronous motor rotor |
| CN108023421B (en) * | 2017-12-21 | 2024-05-28 | 珠海格力电器股份有限公司 | Motor rotor and permanent magnet motor |
| CN108462272A (en) * | 2018-03-16 | 2018-08-28 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor structure and motor with it |
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2019
- 2019-01-16 CN CN201910041163.7A patent/CN109660042B/en active Active
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