CN112953309A - Permanent magnet synchronous magnetic suspension motor - Google Patents
Permanent magnet synchronous magnetic suspension motor Download PDFInfo
- Publication number
- CN112953309A CN112953309A CN202110288006.3A CN202110288006A CN112953309A CN 112953309 A CN112953309 A CN 112953309A CN 202110288006 A CN202110288006 A CN 202110288006A CN 112953309 A CN112953309 A CN 112953309A
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- permanent magnet
- magnet ring
- rotor
- stator
- coil
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N15/00—Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for
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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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
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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
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
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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
Abstract
The invention discloses a permanent magnet synchronous magnetic suspension motor which comprises a rotor, a stator and a sensor, wherein the rotor comprises a first permanent magnet ring, a second permanent magnet ring and a rotor iron core, the rotor is rotatably arranged in the stator, the stator comprises a plurality of coil windings, each coil winding comprises a stator iron core and a permanent magnet limiting component, a suspension coil and a driving coil are arranged and wound on the stator iron core along the extending direction of the stator iron core, and the permanent magnet limiting components respectively form a closed magnetic field with the first permanent magnet ring and the second permanent magnet ring so as to limit the axial deviation of the rotor relative to the stator. The technical scheme of the invention realizes compact structure and light weight of the permanent magnet synchronous magnetic suspension motor.
Description
Technical Field
The invention relates to the field of motors, in particular to a permanent magnet synchronous magnetic suspension motor.
Background
The traditional motor is composed of a stator and a rotor, the stator and the rotor are connected through a mechanical bearing or are in mechanical contact, so that mechanical friction exists in the movement process of the rotor, the mechanical friction not only increases the friction resistance of the rotor, so that moving parts are abraded, mechanical vibration and noise are generated, but also the parts are heated, so that the performance of a lubricant is deteriorated, the air gap of the motor is seriously uneven, the winding is heated, the temperature rise is increased, the efficiency of the motor is reduced, and the service life of the motor is shortened. The magnetic suspension motor makes the rotor suspend by using the principle of like poles repelling and opposite poles attracting between the stator and rotor excitation magnetic field, and generates driving force to drive the rotor to move in the suspension state. Therefore, the stator and the rotor do not have any mechanical contact, can generate higher acceleration and deceleration, has small mechanical abrasion, easy protection of machinery and a motor, convenient maintenance, overhaul and replacement, and is suitable for the fields of severe environment, extremely cleanness, no pollution and special requirements.
Most of the existing magnetic suspension motors are relatively complex in structure, and cannot realize compact structure and light weight, so that the further application space of the magnetic suspension motor is limited.
Disclosure of Invention
The invention mainly aims to provide a permanent magnet synchronous magnetic suspension motor, which realizes compact structure and light weight of the magnetic suspension motor by improving and optimizing the motor structure.
In order to achieve the above object, the present invention provides a permanent magnet synchronous magnetic suspension motor, including:
the rotor comprises a first permanent magnet ring, a second permanent magnet ring and a rotor iron core, wherein the rotor iron core is provided with a plurality of salient poles which extend outwards along the radial direction, the salient poles are distributed along the circumferential direction of the rotor iron core, the first permanent magnet ring and the second permanent magnet ring are respectively arranged at two ends of the rotor iron core, and the first permanent magnet ring and the second permanent magnet ring are axially magnetized and have opposite magnetizing directions;
a stator, the rotor rotatably disposed within the stator, the stator comprising:
a plurality of coil windings spaced apart along a circumference of the rotor, each of the coil windings comprising:
the stator core extends along the axial direction, suspension coils and driving coils are arranged and wound on the stator core along the extending direction of the stator core, the suspension coils are used for suspending the rotor in the stator, and the driving coils are used for driving the rotor to suspend;
the permanent magnet limiting component is fixedly arranged on the stator core, the rotor is rotatably arranged in the permanent magnet limiting component, and the permanent magnet limiting component and the first permanent magnet ring and the second permanent magnet ring form a closed magnetic field respectively so as to limit the axial deviation of the rotor relative to the stator; and
and the sensor is connected with the suspension coil and used for controlling the radial suspension gap of the rotor relative to the stator.
Preferably, the permanent magnet limiting assembly comprises a third permanent magnet ring and a fourth permanent magnet ring which are axially magnetized, the third permanent magnet ring and the fourth permanent magnet ring are axially arranged at intervals, and the rotor is positioned inside the third permanent magnet ring and the fourth permanent magnet ring; the first permanent magnet ring is arranged corresponding to the third permanent magnet ring, and the magnetizing directions of the first permanent magnet ring and the third permanent magnet ring are opposite to each other, so that a closed magnetic field is formed; the second permanent magnet ring is arranged corresponding to the fourth permanent magnet ring, and the magnetizing directions of the second permanent magnet ring and the fourth permanent magnet ring are opposite to each other, so that a closed magnetic field is formed;
the salient pole is located between the third permanent magnet ring and the fourth permanent magnet ring.
Preferably, the stator core includes a core rod portion and a magnetism-attracting portion, the core rod portion extends axially, the suspension coil and the driving coil are wound around the core rod portion, and the magnetism-attracting portion extends from one end of the core rod portion to the inner side along the radial direction of the stator;
the magnetism leading part is positioned between the third permanent magnet ring and the fourth permanent magnet ring, and the magnetism leading part and the salient pole are oppositely arranged at intervals.
Preferably, the suspension coil is located on a side of the driving coil close to the magnetism attracting portion.
Preferably, the suspension coil and the magnetism guiding part are arranged at intervals.
Preferably, the permanent magnet limiting assembly further comprises a fifth permanent magnet ring, the fifth permanent magnet ring is stacked at one end of the third permanent magnet ring, which is opposite to the fourth permanent magnet ring, and the fifth permanent magnet ring is magnetized in the radial direction, so that the third permanent magnet ring and the fifth permanent magnet ring are arranged in a halbach array; and/or
The permanent magnet limiting assembly further comprises a sixth permanent magnet ring, the sixth permanent magnet ring is arranged at one end, back to the third permanent magnet ring, of the fourth permanent magnet ring in a laminated mode, and the sixth permanent magnet ring is magnetized in the radial direction, so that the fourth permanent magnet ring and the sixth permanent magnet ring are arranged in a Halbach array.
Preferably, the number of salient poles is at least four, and the number of coil windings is at least four groups.
Preferably, the number of the salient poles is four or six, and the number of the coil windings is six.
Preferably, the stator further includes a magnetic-conductive fixing seat, one end of the stator core is fixed to the magnetic-conductive fixing seat, and the plurality of coil windings and the magnetic-conductive fixing seat enclose to form an accommodating space for accommodating the rotor to rotate.
Preferably, the suspension coil and the driving coil are arranged at intervals.
According to the technical scheme, a new stator structure and a new rotor structure are designed, the rotor is suspended and driven to rotate through a suspension coil and a driving coil on a stator respectively, a permanent magnet limiting assembly limits axial deviation of the rotor, and the suspension coil is controlled through feedback of a sensor to control a radial suspension gap of the rotor; therefore, the suspension structure of the permanent magnet synchronous magnetic suspension motor is simple, and the motor structure is simplified, so that the compact structure and the light weight of the permanent magnet synchronous magnetic suspension motor are realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a permanent magnet synchronous magnetic levitation motor of the present invention;
FIG. 2 is a schematic structural diagram of a rotor of the permanent magnet synchronous magnetic levitation motor in FIG. 1;
FIG. 3 is a schematic structural diagram of a stator of the permanent magnet synchronous magnetic levitation motor in FIG. 1;
FIG. 4 is a schematic structural diagram of the PMSM of FIG. 1 from another perspective;
FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;
FIG. 6 is a schematic diagram of the transmission of magnetic induction lines of the magnetic field of the permanent magnet synchronous magnetic levitation motor in FIG. 1;
FIG. 7 is an exploded view of the permanent magnet synchronous magnetic levitation motor of FIG. 1;
fig. 8 is a schematic structural diagram of another embodiment of the permanent magnet synchronous magnetic levitation motor of the present invention;
fig. 9 is a schematic diagram of the rotor and the stator of the permanent magnet synchronous magnetic levitation motor in fig. 8 being separated;
FIG. 10 is a schematic structural diagram of the PMSM of FIG. 8 from another perspective;
FIG. 11 is a cross-sectional view taken along line B-B of FIG. 10;
FIG. 12 is a schematic diagram of the transmission of magnetic field lines of the permanent magnet synchronous maglev motor in FIG. 8;
fig. 13 is a schematic diagram of the third permanent magnet ring and the fifth permanent magnet ring in halbach array arrangement, and the fourth permanent magnet ring and the sixth permanent magnet ring in halbach array arrangement in fig. 10.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The heart is a perpetual motion machine in life, once the heart fails and is difficult to repair, the heart function is partially or completely replaced by the artificial heart to become a key for prolonging the life of a patient with the heart disease, in the past, the artificial heart pump using a mechanical bearing can generate friction and heat to damage blood cells, so that hemolysis, coagulation and thrombus are caused, and even the life of the patient is threatened, and the blood pump using the magnetic suspension motor has high efficiency, can prevent the damage of the blood cells, avoids the problems of hemolysis, coagulation and thrombus and the like, is favorable for relieving the suffering of patients with cardiovascular diseases, and improves the life quality of the patient.
The development of very large scale integrated circuits requires that semiconductor silicon wafers be processed in an ultra-vacuum, impurity-free sealed chamber, which has harsh requirements on robots that transport silicon wafers: lubricating oil can not be used, and dust particles and gas can not be generated, so that the magnetic suspension motor is adopted to directly control the robot and the control arm of the robot to be an ideal choice.
In the field of chemical engineering, radioactive environments or high-temperature radiation environments with serious environmental pollution, such as magnetic suspension motors for driving, can solve the problems of mechanical bearing abrasion and periodic maintenance.
The invention provides a permanent magnet synchronous magnetic suspension motor which is suitable for the fields of medical blood pumps, semiconductors and chemical engineering.
In an embodiment of the present invention, referring to fig. 1 to 7, the permanent magnet synchronous magnetic levitation motor 1 includes:
the rotor 10 comprises a first permanent magnet ring 101, a second permanent magnet ring 102 and a rotor core 100, wherein the rotor core 100 is provided with a plurality of salient poles 100a which extend outwards along the radial direction, the plurality of salient poles 100a are distributed along the circumferential direction of the rotor core 100, the first permanent magnet ring 101 and the second permanent magnet ring 102 are respectively arranged at two ends of the rotor core 100, and the first permanent magnet ring 101 and the second permanent magnet ring 102 are axially magnetized and have opposite magnetizing directions;
a stator 20, the rotor 10 being rotatably disposed within the stator 20, the stator 20 including:
a plurality of coil windings 20a distributed at intervals in a circumferential direction of the rotor 10, each of the coil windings 20a including:
a stator core 200, wherein the stator core 200 extends along an axial direction, a suspension coil 210 and a driving coil 220 are wound on the stator core 200 along an extending direction of the stator core, the suspension coil 210 is used for suspending the rotor 10 in the stator 20, and the driving coil 220 is used for driving the rotor 10 to suspend;
a permanent magnet position-limiting assembly 230 fixedly disposed on the stator core 200, wherein the rotor 10 is rotatably disposed in the permanent magnet position-limiting assembly 230, and the permanent magnet position-limiting assembly 230 forms a closed magnetic field with the first permanent magnet ring 101 and the second permanent magnet ring 102, respectively, so as to limit axial displacement of the rotor 10 relative to the stator 20; and
and a sensor connected to the levitation coil 210 for controlling a radial levitation gap of the rotor 10 with respect to the stator 20.
Specifically, the present permanent magnet synchronous maglev motor 1 includes a stator 20, a rotor 10, and a sensor (not shown); wherein the stator 20 can generate a levitation force and a rotational driving force to the rotor 10, so that the rotor 10 can be levitated and rotated in the stator 20. The rotor 10 includes a first permanent magnet ring 101, a second permanent magnet ring 102, and a rotor core 100, the rotor core 100 is disposed in a cylindrical shape, salient poles 100a extend outward in a radial direction from an outer circumferential surface of the rotor core 100, the number of the salient poles 100a is plural, and the plurality of the salient poles 100a are distributed along a circumferential direction of the rotor core 100, and are preferably uniformly distributed. The first permanent magnet ring 101 and the second permanent magnet ring 102 are respectively located at two ends of the rotor core 100, because the first permanent magnet ring 101 and the second permanent magnet ring 102 are both axially magnetized and have opposite magnetizing directions, the polarities of the magnetic fields at the sides of the first permanent magnet ring 101 and the second permanent magnet ring 102 facing each other are the same, in order to inhibit overcoming of the magnetic repulsive force between the first permanent magnet ring 101 and the second permanent magnet ring 102, the first permanent magnet ring 101 and the second permanent magnet ring 102 are respectively fixed at the end of the rotor core 100 by means of gluing, snap-fit connection and the like, and specific adopted fixing manners are not specifically limited here. The first permanent magnet ring 101 and the second permanent magnet ring 102 may be made of a high magnetic flux density permanent magnet material, such as a neodymium iron boron permanent magnet, a permanent magnetic ferrite, an iron chromium cobalt permanent magnet alloy material, and the like.
For the stator 20, the stator 20 has a housing (not shown), the coil winding 20a is fixed in the housing, two groups of coils, namely a suspension coil 210 and a driving coil 220, are respectively wound on the stator core 200, wherein the suspension coil 210 and the driving coil 220 are arranged along the axial direction of the stator 20; the levitation coil 210 and the driving coil 220 are independently powered, the levitation coil 210 generates an excitation levitation magnetic field to levitate the rotor 10 in the excitation levitation magnetic field, and the driving coil 220 generates an excitation driving magnetic field to drive the rotor 10 to rotate. It should be noted that the suspension coil 210 and the driving coil 220 respectively and independently work, and the current, the frequency and the waveform of the current flowing into the suspension coil 210 and the driving coil 220 are different, so that the generated excitation driving magnetic field and the excitation suspension magnetic field do not have the phenomenon of magnetic field coupling, and the rotor 10 is ensured to respectively and independently realize suspension and rotation relative to the stator 20 without mutual influence. The driving coil 220 drives the rotor 10 to rotate in a permanent magnet synchronous manner, which is not specifically described herein.
The levitation coil 210 and the driving coil 220 may be disposed in contact with each other in sequence, or the levitation coil 210 and the driving coil 220 may be disposed at an interval. In the present embodiment, the levitation coil 210 and the driving coil 220 are preferably arranged at intervals, so that the mutual interference between the excitation driving magnetic field and the excitation levitation magnetic field can be reduced.
In order to ensure that the rotor 10 can stably rotate in the stator 20 in a suspended manner, the stator core 200 is further fixedly provided with a permanent magnet limiting assembly 230, the rotor 10 is rotatably arranged in the permanent magnet limiting assembly 230, the permanent magnet limiting assembly 230 and the first permanent magnet ring 101 and the second permanent magnet ring 102 form a closed magnetic field, and further the first permanent magnet ring 101 and the second permanent magnet ring 102 cannot axially shift in the axial direction of the permanent magnet synchronous magnetic levitation motor 1.
In the permanent magnet synchronous magnetic suspension motor 1, the suspension coil 210 can generate an excitation suspension magnetic field, a certain gap is always kept between the rotor 10 and the stator 20 in the suspension process of the rotor 10, in the radial direction of the motor, a sensor (not shown) is used for detecting the radial deviation of the rotor 10, the current of the suspension coil 210 is controlled according to the radial deviation of the rotor 10 fed back by the sensor, the radial deviation of the rotor 10 is adjusted, and then a stable radial air gap is kept between the rotor 10 and the stator 20.
The sensors may be provided at a plurality of positions, and may be provided on the rotor 10 or the stator 20. For example, when the sensor is located on the stator 20, the sensor may be disposed between two adjacent coil windings 20a, that is, the sensor is distributed in the gap between two adjacent stator cores 200. The sensor can adopt hall components to realize the detection of the radial deviation of the rotor 10.
According to the technical scheme, a new stator 20 structure and a new rotor 10 structure are designed, the rotor 10 is suspended and driven to rotate through a suspension coil 210 and a driving coil 220 on the stator 20, the permanent magnet limiting assembly 230 limits the axial deviation of the rotor 10, and the suspension coil 210 is controlled through sensor feedback to control the radial suspension gap of the rotor 10; therefore, the suspension structure of the permanent magnet synchronous magnetic suspension motor 1 is simple, and the motor structure is simplified, so that the compact structure and the light weight of the permanent magnet synchronous magnetic suspension motor 1 are realized.
Further, the permanent magnet limiting assembly 230 includes a third permanent magnet ring 231 and a fourth permanent magnet ring 232, both of which are axially magnetized, the third permanent magnet ring 231 and the fourth permanent magnet ring 232 are axially disposed at intervals, and the rotor 10 is located inside the third permanent magnet ring 231 and the fourth permanent magnet ring 232; the first permanent magnet ring 101 is arranged corresponding to the third permanent magnet ring 231, and the magnetizing directions of the first permanent magnet ring and the third permanent magnet ring are opposite to each other, so that a closed magnetic field is formed; the second permanent magnet ring 102 is arranged corresponding to the fourth permanent magnet ring 232, and the magnetizing directions of the second permanent magnet ring and the fourth permanent magnet ring are opposite to each other, so that a closed magnetic field is formed; the salient pole 100a of the rotor 10 is positioned between the third permanent magnet ring 231 and the fourth permanent magnet ring 232. The third permanent magnet ring 231 and the fourth permanent magnet ring 232 may be made of a high magnetic flux density permanent magnet material, such as a neodymium iron boron permanent magnet, a permanent magnetic ferrite, an iron chromium cobalt permanent magnet alloy material, and the like. The third permanent magnet ring 231 is sleeved outside the first permanent magnet ring 101 at intervals, and the polarity of the first permanent magnet ring 101 is opposite to that of the third permanent magnet ring 231, so that a closed magnetic field can be formed between the first permanent magnet ring 101 and the third permanent magnet ring 231, and the first permanent magnet ring 101 is subjected to the action of the magnetic field of the third permanent magnet ring 231 to limit the movement of the first permanent magnet ring 101 along the axial direction of the motor, so that the axial deviation of the rotor 10 is limited; similarly, the fourth permanent magnet ring 232 is sleeved outside the second permanent magnet ring 102 at intervals, and the polarity of the fourth permanent magnet ring 232 is opposite to that of the second permanent magnet ring 102, so that a closed magnetic field can be formed between the fourth permanent magnet ring 232 and the second permanent magnet ring 102, and the second permanent magnet ring 102 is affected by the magnetic field of the fourth permanent magnet ring 232 to limit the movement of the second permanent magnet ring 102 along the axial direction of the motor, so as to limit the axial deviation of the rotor 10. Because the magnetizing directions of the third permanent magnet ring 231 and the fourth permanent magnet ring 232 are opposite, the direction of the magnetic field acting force of the rotor 10 on the third permanent magnet ring 231 is just opposite to the direction of the magnetic field acting force of the rotor 10 on the fourth permanent magnet ring 232, so that the rotor 10 can be stably suspended between the third permanent magnet ring 231 and the fourth permanent magnet ring 232, and the axial deviation of the rotor 10 is limited.
In this embodiment, the stator core 200 includes a core rod portion 201 and a magnetism guiding portion 202, the core rod portion 201 extends axially, the stator core 200 is substantially disposed in an inverted "L", the suspension coil 210 and the driving coil 220 are wound around the core rod portion 201, and the magnetism guiding portion 202 extends from one end of the core rod portion 201 toward the inside along the radial direction of the stator 20; the magnetism attracting portion 202 is located between the third permanent magnet ring 231 and the fourth permanent magnet ring 232, and the magnetism attracting portion 202 is disposed at an interval opposite to the salient pole 100 a. The salient poles 100a and the magnetism attracting portions 202 of the rotor core 100 are arranged to face each other, so that the magnetic induction lines of the rotor 10 are concentrated at the salient poles 100a, the magnetic induction lines of the stator core 200 are concentrated at the magnetism attracting portions 202, and when the stator 20 and the rotor 10 form a closed magnetic field, the magnetic induction lines pass through the salient poles 100a and the magnetism attracting portions 202, respectively. Due to the presence of the salient poles 100a and the magnetism attracting portions 202, the position of the rotor 10 in the axial direction with respect to the inside of the stator 20 is determined. The levitation coil 210 is preferably located on a side of the driving coil 220 close to the magnetism drawing portion 202, so as to ensure that the magnetic induction lines generated by the levitation coil 210 are concentrated as much as possible on the magnetism drawing portion 202.
In order to ensure a certain axial movement space of the rotor 10 relative to the stator 20 during axial levitation, the levitation coil 210 and the magnetism inducing portion 202 are spaced apart from each other, so that the rotor 10 can be allowed to shift axially during axial levitation. Of course, in other embodiments, there may be no gap between the suspension coil 210 and the magnetic attraction portion 202, but the suspension coil 210 and the magnetic attraction portion 202 abut against each other
Referring to fig. 8 to 13, in another preferred embodiment of this embodiment, the permanent magnet positioning assembly 230 further includes a fifth permanent magnet ring 233, the fifth permanent magnet ring 233 is stacked on one end of the third permanent magnet ring 231 opposite to the fourth permanent magnet ring 232, and the fifth permanent magnet ring 233 is magnetized in a radial direction, so that the third permanent magnet ring 231 and the fifth permanent magnet ring 233 are arranged in a Halbach Array (Halbach Array). Because the third permanent magnet ring 231 and the fifth permanent magnet ring 233 form a Halbach Array (Halbach Array), the strongest magnetic field can be generated by the least permanent magnets, and the mutual superposition of the axial magnetic field and the radial magnetic field after the structural decomposition of the Halbach Array magnetic ring can greatly improve the magnetic field intensity towards one side of the magnetism guiding part 202, thereby effectively reducing the volume of the motor and improving the power density of the motor.
Similarly, the permanent magnet limiting component 230 further includes a sixth permanent magnet ring 234, the sixth permanent magnet ring 234 is stacked on one end of the fourth permanent magnet ring 232 opposite to the third permanent magnet ring 231, and the sixth permanent magnet ring 234 is magnetized in a radial direction, so that the fourth permanent magnet ring 232 and the sixth permanent magnet ring 234 are arranged in a Halbach Array shape (Halbach Array). Because the fourth permanent magnet ring 232 and the sixth permanent magnet ring 234 form a Halbach Array (Halbach Array), the strongest magnetic field can be generated by the least permanent magnets, and the mutual superposition of the axial magnetic field and the radial magnetic field after the structural decomposition of the Halbach Array magnetic ring greatly improves the magnetic field intensity towards one side of the magnetism guiding part 202.
In this embodiment, besides the fifth permanent magnet ring 233 and the sixth permanent magnet ring 234, the permanent magnet position limiting assembly 230 may further include corresponding permanent magnet rings stacked and added according to the design requirement of the motor, and these permanent magnet rings may still form a Halbach Array-like (Halbach Array) permanent magnet structure with the third permanent magnet ring 231 and the fifth permanent magnet ring 233, respectively, so as to further increase the magnetic field strength toward the side of the magnetic attracting portion 202. Of course, the additional permanent magnet ring may also form a Halbach Array-like (Halbach Array) permanent magnet structure with the fourth permanent magnet ring 232 and the sixth permanent magnet ring 234, which is not described in one-to-one correspondence.
In the present embodiment, the rotor 10 has at least four salient poles 100 a; for the stator 20, the number of the coil windings 20a is at least four, and the plurality of coil windings 20a are uniformly distributed at intervals along the circumferential direction of the rotor 10 and are rotated in a space region surrounded by the plurality of coil windings 20 a. Referring to fig. 1 to 7, as a first preferred embodiment of the example of the present invention, salient poles 100a are four in number and arranged in a cross shape, and coil windings 20a are six in number; referring to fig. 8 to 12, as a second preferred embodiment of the present invention, the number of the salient poles 100a is six, the number of the coil windings 20a is six, the third permanent magnet ring 231 and the fifth permanent magnet ring 233 constitute a Halbach Array (Halbach Array) permanent magnet structure, and the fourth permanent magnet ring 232 and the sixth permanent magnet ring 234 constitute a Halbach Array (Halbach Array) permanent magnet structure.
Further, the stator 20 further includes a magnetic fixing seat 240, one end of the stator core 200 is fixed to the magnetic fixing seat 240230, and the plurality of coil windings 20a210 and the magnetic fixing seat 240230 enclose to form an accommodating space for accommodating the rotor 1010 to rotate. The magnetic-conductive fixing seat 240 is used for fixing the stator core 200, so that the plurality of coil windings 20a of the stator 20 are fixed at the magnetic-conductive fixing seat 240, and the structure of the stator 20 is stable; on the other hand, the magnetic conduction fixing seat 240 and the stator core 200 are in contact with each other, and the magnetic field lines formed on the coil winding 20a can be transmitted in the magnetic conduction fixing seat 240 through the stator core 200, so that the magnetic energy utilization rate is improved.
The stator core 200 and the magnetic conductive fixing seat 240 are fixed in various manners, for the stator core 200, one end of the core rod portion 201 is provided with the magnetic guiding portion 202, and the other end of the core rod portion can be directly connected with the magnetic conductive fixing seat 240 in an inserting and fixing manner or a welding and fixing manner, which is not limited specifically here. As shown in fig. 8, the iron core rod 201 and the magnetic conductive fixing seat 240 are fixed by inserting, so as to facilitate the assembly of the stator 20.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A permanent magnet synchronous magnetic suspension motor, characterized by comprising:
the rotor comprises a first permanent magnet ring, a second permanent magnet ring and a rotor iron core, wherein the rotor iron core is provided with a plurality of salient poles which extend outwards along the radial direction, the salient poles are distributed along the circumferential direction of the rotor iron core, the first permanent magnet ring and the second permanent magnet ring are respectively arranged at two ends of the rotor iron core, and the first permanent magnet ring and the second permanent magnet ring are axially magnetized and have opposite magnetizing directions;
a stator, the rotor rotatably disposed within the stator, the stator comprising:
a plurality of coil windings spaced apart along a circumference of the rotor, each of the coil windings comprising:
the stator core extends along the axial direction, suspension coils and driving coils are arranged and wound on the stator core along the extending direction of the stator core, the suspension coils are used for suspending the rotor in the stator, and the driving coils are used for driving the rotor to suspend;
the permanent magnet limiting component is fixedly arranged on the stator core, the rotor is rotatably arranged in the permanent magnet limiting component, and the permanent magnet limiting component and the first permanent magnet ring and the second permanent magnet ring form a closed magnetic field respectively so as to limit the axial deviation of the rotor relative to the stator; and
and the sensor is connected with the suspension coil and used for controlling the radial suspension gap of the rotor relative to the stator.
2. The permanent magnet synchronous magnetic suspension motor according to claim 1, wherein the permanent magnet position limiting assembly comprises a third permanent magnet ring and a fourth permanent magnet ring which are axially magnetized, the third permanent magnet ring and the fourth permanent magnet ring are axially spaced, and the rotor is located inside the third permanent magnet ring and the fourth permanent magnet ring; the first permanent magnet ring is arranged corresponding to the third permanent magnet ring, and the magnetizing directions of the first permanent magnet ring and the third permanent magnet ring are opposite to each other, so that a closed magnetic field is formed; the second permanent magnet ring is arranged corresponding to the fourth permanent magnet ring, and the magnetizing directions of the second permanent magnet ring and the fourth permanent magnet ring are opposite to each other, so that a closed magnetic field is formed;
the salient pole is located between the third permanent magnet ring and the fourth permanent magnet ring.
3. The permanent magnet synchronous magnetic suspension motor according to claim 2, wherein the stator core comprises a core rod part and a magnetic guiding part, the core rod part extends axially, the suspension coil and the driving coil are wound on the core rod part, and the magnetic guiding part extends from one end of the core rod part to the inner side along the radial direction of the stator;
the magnetism leading part is positioned between the third permanent magnet ring and the fourth permanent magnet ring, and the magnetism leading part and the salient pole are oppositely arranged at intervals.
4. The permanent magnet synchronous magnetic levitation motor as recited in claim 3, wherein the levitation coil is positioned at a side of the driving coil close to the magnetism attracting portion.
5. The permanent magnet synchronous magnetic levitation motor of claim 4, wherein the levitation coil is spaced apart from the magnetism inducing portion.
6. The permanent magnet synchronous magnetic suspension motor according to claim 3, wherein the permanent magnet position limiting assembly further comprises a fifth permanent magnet ring, the fifth permanent magnet ring is stacked on one end of the third permanent magnet ring opposite to the fourth permanent magnet ring, and the fifth permanent magnet ring is magnetized in a radial direction, so that the third permanent magnet ring and the fifth permanent magnet ring are arranged in a Halbach array; and/or
The permanent magnet limiting assembly further comprises a sixth permanent magnet ring, the sixth permanent magnet ring is arranged at one end, back to the third permanent magnet ring, of the fourth permanent magnet ring in a laminated mode, and the sixth permanent magnet ring is magnetized in the radial direction, so that the fourth permanent magnet ring and the sixth permanent magnet ring are arranged in a Halbach array.
7. The permanent magnet synchronous magnetic levitation motor as recited in any one of claims 1 through 6, wherein the number of salient poles is at least four and the number of coil windings is at least four groups.
8. The permanent magnet synchronous magnetic levitation motor of claim 7, wherein the number of salient poles is four or six and the number of coil windings is six.
9. The pmmag motor of claim 1, wherein the stator further comprises a magnetically conductive mounting base, one end of the stator core is secured to the magnetically conductive mounting base, and the plurality of coil windings and the magnetically conductive mounting base enclose a receiving space for receiving the rotor for rotation.
10. The permanent magnet synchronous magnetic levitation motor of claim 1, wherein the levitation coil and the driving coil are spaced apart.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110288006.3A CN112953309A (en) | 2021-03-17 | 2021-03-17 | Permanent magnet synchronous magnetic suspension motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110288006.3A CN112953309A (en) | 2021-03-17 | 2021-03-17 | Permanent magnet synchronous magnetic suspension motor |
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| Publication Number | Publication Date |
|---|---|
| CN112953309A true CN112953309A (en) | 2021-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110288006.3A Withdrawn CN112953309A (en) | 2021-03-17 | 2021-03-17 | Permanent magnet synchronous magnetic suspension motor |
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| Country | Link |
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| CN (1) | CN112953309A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114748788A (en) * | 2022-03-22 | 2022-07-15 | 苏州心擎医疗技术有限公司 | Stator assembly for magnetic suspension motor, magnetic suspension motor and external centrifugal magnetic suspension blood pump |
| CN117254714A (en) * | 2023-11-14 | 2023-12-19 | 苏州苏磁智能科技有限公司 | Magnetic suspension device applied to wafer processing and semiconductor processing equipment |
-
2021
- 2021-03-17 CN CN202110288006.3A patent/CN112953309A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114748788A (en) * | 2022-03-22 | 2022-07-15 | 苏州心擎医疗技术有限公司 | Stator assembly for magnetic suspension motor, magnetic suspension motor and external centrifugal magnetic suspension blood pump |
| CN117254714A (en) * | 2023-11-14 | 2023-12-19 | 苏州苏磁智能科技有限公司 | Magnetic suspension device applied to wafer processing and semiconductor processing equipment |
| CN117254714B (en) * | 2023-11-14 | 2024-03-19 | 苏州苏磁智能科技有限公司 | Magnetic suspension device applied to wafer processing and semiconductor processing equipment |
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