CN113965010A - Motor with magnetic suspension bearing and preparation method - Google Patents

Motor with magnetic suspension bearing and preparation method Download PDF

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Publication number
CN113965010A
CN113965010A CN202111097594.9A CN202111097594A CN113965010A CN 113965010 A CN113965010 A CN 113965010A CN 202111097594 A CN202111097594 A CN 202111097594A CN 113965010 A CN113965010 A CN 113965010A
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CN
China
Prior art keywords
stator
magnetic suspension
suspension bearing
magnetic
composite material
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Pending
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CN202111097594.9A
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Chinese (zh)
Inventor
陈兵
包崇玺
朱志荣
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Mbtm New Materials Group Co ltd
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Mbtm New Materials Group Co ltd
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Priority to CN202111097594.9A priority Critical patent/CN113965010A/en
Publication of CN113965010A publication Critical patent/CN113965010A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/09—Structural association with bearings with magnetic bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/0408—Passive magnetic bearings
    • F16C32/041—Passive magnetic bearings with permanent magnets on one part attracting the other part
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/60—Ferrous alloys, e.g. steel alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

The invention relates to a motor with magnetic suspension bearings and a preparation method thereof, wherein the motor with magnetic suspension bearings comprises a stator, a rotor and two magnetic suspension bearings, the stator and the rotor are positioned between the two magnetic suspension bearings and are coaxially arranged, and the motor with magnetic suspension bearings is characterized in that: the magnetic suspension bearing and the stator are both made of soft magnetic composite material powder, and the soft magnetic composite material powder comprises the following components in percentage by mass: c is more than 0 and less than or equal to 1.0 percent, oxygen: o is more than 0 and less than or equal to 0.8 percent, and inevitable impurities: less than or equal to 0.1 percent and the balance of iron. The soft magnetic composite material powder has magnetic and thermal isotropy, low high-frequency eddy current loss and high material utilization rate.

Description

Motor with magnetic suspension bearing and preparation method
Technical Field
The invention belongs to the technical field of magnetic suspension, and particularly relates to a motor with a magnetic suspension bearing and a preparation method thereof.
Background
The conventional bearings have mechanical contact, so that mechanical wear exists, although lubricating oil is usually added for reducing the mechanical wear, the service life of the bearings is greatly reduced in the long-term use process, the mechanical movement efficiency is reduced, and in addition, larger noise is generated due to the mechanical contact.
In order to solve the above technical problems, magnetic bearings have gradually appeared, and the principle of the magnetic bearings is as follows: the inner surface of the stator is grooved and wound, the stator is made into an electromagnet, and the outer surface of the rotor is grooved and embedded with permanent magnet sheets; when the rotor rotates, the magnetic repulsion force of the stator and the rotor enables the rotor to be suspended; in order to make the rotor stably suspend, a sensor for detecting the position and speed of the rotor is arranged in the stator, if the rotor is disturbed, the sensor transmits a detected signal to the controller, the control signal enables the power amplifier to generate a control current, and the control current controls the magnetic force, so that the rotor is stably kept at a balance position.
Compared with the traditional rolling bearing, sliding bearing and oil film bearing, the magnetic suspension bearing has the advantages that the rotor can run to a very high rotating speed due to no mechanical contact, the mechanical abrasion is small, the energy consumption is low, the noise is low, the service life is long, the lubrication is not needed, the oil pollution is avoided, and the like, and the magnetic suspension bearing is particularly suitable for special environments such as high speed, vacuum and ultra-clean.
For example, the patent application No. CN202011168119.1 (application publication No. CN112253624A) discloses a radial hybrid magnetic suspension bearing assembly, as in the chinese patent application "radial hybrid magnetic suspension bearing assembly and motor with the same", in which a permanent magnet is disposed in a first end of an outer stator core; the first radial vertical stator assembly is arranged in the second end of the outer stator core; the first radial horizontal stator assembly is arranged in the outer stator iron core and positioned between the permanent magnet and the first radial vertical stator assembly; the rotor assembly comprises a rotating shaft, and the first radial vertical stator assembly and the first radial horizontal stator assembly are used for generating independent control magnetic fields which are used for controlling the bias magnetic field to control the rotating shaft to move along a preset direction. The stator in the patent cannot effectively realize an integrated structural design, the utilization rate of materials can be greatly reduced, and the controllability on the torque of the rotor is difficult to realize; the bearing in the patent has relatively large defects in the aspects of mechanical efficiency, service life and the like, and high-frequency eddy current loss is high.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a motor with a magnetic suspension bearing with low high-frequency eddy current loss, aiming at the current situation of the prior art.
The second technical problem to be solved by the invention is to provide a preparation method of the motor with low high-frequency eddy current loss.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a motor with magnetic suspension bearing, including stator, rotor and two magnetic suspension bearings, stator and rotor are located two between the magnetic suspension bearing, and coaxial arrangement, its characterized in that: the magnetic suspension bearing and the stator are both made of soft magnetic composite material powder, and the soft magnetic composite material powder comprises the following components in percentage by mass: c is more than 0 and less than or equal to 1.0 percent, oxygen: o is more than 0 and less than or equal to 0.8 percent, and inevitable impurities: less than or equal to 0.1 percent and the balance of iron.
Preferably, the density of the magnetic suspension bearing and the stator is 7.20-7.6 g/cm3。
One of the arrangement modes of the stator and the magnetic suspension bearing is as follows: the stator is positioned between the rotor and one of the magnetic suspension bearings, and the magnetic suspension bearing is connected with the stator through an insulating connecting piece.
Setting modes of the stator and the magnetic suspension middle bearing are as follows: the number of the stators is two, the stators are positioned on two sides of the rotor, and each stator and the magnetic suspension bearing on the corresponding side are integrated.
In addition, the motor can also adopt a structure with a plurality of stators and rotors.
The magnetic suspension bearing has various structures, but preferably, the magnetic suspension bearing comprises an annular body in a circular ring shape, a plurality of magnetic pole iron cores arranged at intervals along the circumferential direction are arranged on the inner circumference of the annular body, the magnetic pole iron cores extend along the radial direction, the tail ends of the magnetic pole iron cores are provided with pole shoes, and the distance between the pole shoes and the center line of the annular body is 1.0-10.0 mm. The interval within 1.0-10.0 mm can fully ensure the high efficiency and stability of the rotor operation. The interval below 1.0mm is difficult to obtain guaranteeing in the mechanical cooperation in-process to in the rotor initial motion process, cause the collision very easily and cause the damage or the accident of motor, and when the interval was greater than 10.0mm, the interval was too big, and torsional magnetic force weakens and can make the rotor produce big vibration under high-speed operation condition, thereby makes the motor operation unstable.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the preparation method of the motor is characterized by sequentially comprising the following steps of:
1) preparation of soft magnetic composite powder:
annealing the soft magnetic composite material powder at 700-1200 ℃, then uniformly mixing iron powder and a phosphoric acid solution, then adding an organosilane solution into the mixed solution, standing at normal temperature or heating and drying, and then adding a release agent to prepare the soft magnetic composite material powder;
2) pressing a magnetic suspension bearing:
pressing the soft magnetic composite material powder into a soft magnetic composite material powder with the density of 7.20-7.6 g/cm3The magnetic suspension bearing of (1);
3) pressing a stator:
pressing the soft magnetic composite material powder into a soft magnetic composite material powder with the density of 7.20-7.6 g/cm3The stator of (1);
4) and (3) heat treatment:
and (4) placing the magnetic suspension bearing and the stator in a furnace for heat treatment.
The motor prepared by the soft magnetic composite material can be used for designing a multi-dimensional complex motor structure, the silicon steel motor can be improved to be only capable of carrying out simple two-dimensional structural design, and the motor with the magnetic suspension bearing and the bearing are designed in a magnetic suspension matching mode, so that the advantages of the motor and the bearing are combined. The magnetic suspension bearing motor prepared by fully utilizing the soft magnetic composite material has the advantages of magnetic and thermal isotropy, low high-frequency eddy current loss, material utilization rate close to 100%, iron core lamination coefficient close to 1, high dimensional accuracy and suitability for a three-dimensional complex magnetic circuit structure motor. Meanwhile, the magnetic suspension bearing stator and the motor stator are integrally designed, so that the structure is simplified, and the magnetic suspension bearing motor is simpler and easier to manufacture and assemble.
Preferably, the phosphoric acid solution in step 1) comprises phosphoric acid and an alcohol solution, wherein the concentration ratio of the phosphoric acid to the alcohol solution is 1-50%. The phosphoric acid and alcohol solution in the concentration range can be properly adjusted according to the coating amount of the iron powder and coating equipment. The concentration is lower than 1%, the coating effect of the powder is not obvious, and the effect of reducing loss cannot be effectively achieved. When the concentration is higher than 50%, the performance of the magnetic powder core is lowered due to the addition of an excessive amount of the non-ferromagnetic substance.
Preferably, the concentration of the organosilane solution added in step 1) is 1-50%, and the amount of the release agent added is 0.1-1.0 wt%. The addition of organosilane can play a role in secondary coating and has an obvious effect on improving the strength. The addition concentration is lower than 1%, the effect is not obvious, and the concentration is higher than 50%, so that the magnetic property of the prepared part is reduced. The addition of the release agent in the range has certain influence on the material forming and density, the addition amount is less than 0.1 wt%, the phenomena of die drawing and the like can occur in the demoulding of the magnetic suspension bearing and the stator, the addition amount is more than 1.0 wt%, the product density can be reduced, and a part of non-magnetic structure can be remained in the heat treatment process to influence the magnetic performance.
Preferably, in the step 1), the temperature during heating and drying is 50-100 ℃.
Further preferably, in the step 4), the heat treatment is performed at a temperature of 500 to 700 ℃ for 5 to 30min in an atmosphere of nitrogen, oxygen or air. Because the soft magnetic composite material particles have insulating layers, the high-temperature sintering cannot be carried out, and the lubricant added during the forming can be removed only by heat treatment, so that the strength of the magnetic core is improved, the internal stress is partially eliminated, and the soft magnetic capacity of the magnetic core is improved. The heat treatment temperature is below 700 ℃, the lubricant is removed more thoroughly along with the increase of the heat treatment temperature or the time extension, the internal stress is better eliminated, the coercive force is reduced along with the increase of the heat treatment temperature, the hysteresis loss is reduced, and the magnetic loss is reduced. When the temperature exceeds 700 ℃ or the heat treatment time exceeds 30min, the insulating coating on the surface of the iron powder is decomposed, and the magnetic loss is increased.
Compared with the prior art, the invention has the advantages that: the magnetic suspension bearing and the stator of the motor with the magnetic suspension bearing are both made of soft magnetic composite materials, and soft magnetic composite material powder comprises carbon in percentage by mass: c is more than 0 and less than or equal to 1.0 percent, oxygen: o is more than 0 and less than or equal to 0.8 percent, and inevitable impurities: less than or equal to 0.1 percent, the balance being iron, the magnetic and thermal isotropy of the soft magnetic composite material powder, the high-frequency eddy current loss is low, the utilization rate of the material is high, the soft magnetic composite material actually leads the magnetic conduction and the electric conductivity between particles to be reduced by coating a layer of insulating material on the surface of iron powder particles, and the resistivity of the material can be improved by insulating coating treatment, thereby reducing the eddy current loss of the material. The magnetically soft composite material magnetic suspension bearing prepared by the powder metallurgy process has the characteristics of unique three-dimensional isotropy, low eddy current loss and medium-high frequency; in addition, the magnetic suspension bearing has the advantages of small mechanical wear, low energy consumption, low noise, long service life, no lubrication and no oil pollution.
Drawings
Fig. 1 is a schematic structural diagram of a motor according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a first magnetic suspension bearing in FIG. 1;
FIG. 3 is a schematic structural view of the stator of FIG. 1;
FIG. 4 is a schematic view of the structure of the insulated connector of FIG. 1;
FIG. 5 is a schematic structural view of the rotor of FIG. 1;
fig. 6 is a schematic structural view of a motor according to a fourth embodiment of the present invention;
FIG. 7 is a schematic structural view of the first stator and the first magnetic bearing of FIG. 6 connected together;
fig. 8 is a schematic structural view of the rotor of fig. 6.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The first embodiment is as follows:
as shown in fig. 1 to 5, a first preferred embodiment of the present invention is shown.
As shown in fig. 1 and 4, the motor of this embodiment includes a central shaft 7, and a stator 1, a rotor 2 and two magnetic suspension bearings coaxially arranged, wherein the two magnetic suspension bearings are a first magnetic suspension bearing 31 and a second magnetic suspension bearing 32, respectively, and specifically, the motor includes the first magnetic suspension bearing 31, an insulating connecting member 4, the stator 1, the rotor 2 and the second magnetic suspension bearing 32 in sequence from left to right, and the central shaft 7 penetrates through the centers of the first magnetic suspension bearing 31, the insulating connecting member 4, the stator 1, the rotor 2 and the second magnetic suspension bearing 32. The first magnetic bearing 31 is connected to the stator 1 via an insulating connection 4. The two magnetic suspension bearings and the stator 1 are all formed by pressing soft magnetic composite material powder, and the soft magnetic composite material powder comprises the following components in percentage by mass: c is more than 0 and less than or equal to 1.0 percent, oxygen: o is more than 0 and less than or equal to 0.8 percent, and inevitable impurities: less than or equal to 0.1 percent and the balance of iron. In the soft magnetic composite material powder of the present embodiment, in terms of mass percentage, carbon is 0.5%, oxygen is 0.4%, and unavoidable impurities: 0.05% and the balance of iron.
As shown in fig. 2, the two magnetic bearings have the same structure, and the first magnetic bearing 31 will be described as an example. The first magnetic suspension bearing 31 includes an annular body 311, the annular body 311 is an iron body, the inner circumference of the annular body 311 is provided with a plurality of magnetic pole cores 312 arranged at intervals along the circumferential direction, there are four magnetic pole cores 312, each magnetic pole core 312 extends along the radial direction, the tail end of each magnetic pole core 312 is provided with a pole shoe 3121, and the distance between the pole shoe 3121 and the center line of the corresponding annular body 311 is 1.0-10.0 mm. In addition, the first magnetic suspension bearing 31 is further provided with a position sensor, a permanent magnet and a power amplifier, and each magnetic pole core 312 corresponds to one power amplifier, which has the same working principle as the prior art and will not be described in detail again in this embodiment.
The attraction force generated by the radial pole core 312 generated by the magnetic suspension bearing just offsets the gravity of the rotor 2. In the working process of the motor, the power amplifier quantitatively inputs current to the magnetic pole iron core 312 through a signal fed back by the displacement of the rotor 2, the magnitude of the levitation force is controlled, the rotor 2 is stable in operation, the working principle of the magnetic levitation motor is the same as that of the motor in the application, and details are not repeated in this embodiment.
As shown in fig. 3, the stator 1 includes a stator ring 11 having a circular ring shape, the stator ring 11 is provided with a plurality of coil windings 12 arranged at intervals in the circumferential direction on a surface facing the rotor 2, and the number of the coil windings 12 in this embodiment is 12. In the magnetic levitation bearing of the present embodiment, the number of the pole core 312 and the coil winding 12 of the stator are both even.
As shown in fig. 5, the rotor 2 is provided with a plurality of permanent magnets 21 arranged at intervals in the circumferential direction on the surface facing the second magnetic suspension bearing 32, specifically, 10 permanent magnets 21, and the permanent magnets 21 and the rotor 2 are bonded together by epoxy glue.
The preparation method of the motor comprises the following steps:
1) preparation of soft magnetic composite powder:
annealing soft magnetic composite material powder (iron powder and carbon) at 700 ℃, and then uniformly mixing the iron powder and a phosphoric acid solution, wherein the phosphoric acid solution comprises phosphoric acid and an alcohol solution, and the concentration ratio of the phosphoric acid to the alcohol solution is 1%; then adding an organosilane solution with the concentration of 1% into the mixed solution, standing at normal temperature, and then adding a release agent with the mass ratio of 0.1 wt% to prepare soft magnetic composite material powder;
2) pressing a magnetic suspension bearing:
pressing the soft magnetic composite powder into a soft magnetic composite powder with a density of 7.20g/cm3The annular body 311 of the magnetic suspension bearing, the inner peripheral edge and the outer peripheral edge of the annular body 311 are both formed with a round angle of 1mm, and then the magnetic pole core 312 is arranged on the inner periphery of the annular body 311 of the magnetic suspension bearing;
3) pressing the stator 1:
pressing the soft magnetic composite powder into a soft magnetic composite powder with a density of 7.20g/cm3Is determined byA sub-ring 11, wherein the inner circumference edge and the outer circumference edge of the stator ring 11 are both formed with a fillet of 1mm, and then 12 coil windings are arranged on the stator ring 11;
4) and (3) heat treatment:
placing the two magnetic suspension bearings and the stator in a sintering furnace, and carrying out heat treatment in the atmosphere of nitrogen, oxygen or air, wherein the heat treatment temperature is 500 ℃ and the heat treatment time is 5 min;
5) machining:
and measuring the size and the precision of the magnetic suspension bearing and the stator after heat treatment, and determining whether machining is needed.
The magnetic suspension bearing has the following advantages: 1. the magnetic suspension bearing is simple in manufacturing process, adopts soft magnetic composite materials to perform powder metallurgy pressing, and is machined after heat treatment; 2. the magnetic suspension bearing has higher rotating speed, and the maximum linear speed can reach 10000 m/min; 3. the magnetic suspension bearing is free of abrasion, low in power consumption and only 6% -25% of a common mechanical bearing; 4. the online control can be carried out aiming at the static and dynamic performances of the magnetic suspension bearing, and the working condition monitoring, the fault diagnosis and the online adjustment are realized.
Example two:
this embodiment differs from the first embodiment described above in that: 1. the soft magnetic composite material powder has different contents, and specifically, the soft magnetic composite material powder comprises, by mass, 1.0% of carbon, 0.8% of oxygen, and inevitable impurities: 0.05% and the balance of iron.
2. The parameters in the motor preparation method are different, specifically, the annealing temperature in the step 1) is 1000 ℃, the concentration ratio of phosphoric acid and alcohol solution is 20%, after 30% of organosilane is added, the mixture is heated and dried at 50 ℃, and after drying, 0.8 wt% of release agent is added.
The density of the magnetic suspension bearing pressed in the step 2) is 7.4g/cm3The inner circumference edge and the outer circumference edge of the annular body 311 are both provided with a fillet of 1.5 mm; the density of the stator ring 11 in the step 3) is 7.4g/cm3The inner and outer peripheral edges of the ring body 311 are formed uniformlyForming a fillet with the diameter of 1.5 mm; the temperature of the heat treatment in the step 4) is 600 ℃, and the heat treatment time is 15 min.
Example three:
this embodiment differs from the first embodiment described above in that: the parameters in the motor preparation method are different, specifically, the annealing temperature in the step 1) is 1200 ℃, the concentration ratio of phosphoric acid and alcohol solution is 50%, after 50% of organosilane is added, the mixture is heated and dried at 80 ℃, and after drying, the release agent with the mass ratio of 1.0 wt% is added.
The density of the magnetic suspension bearing pressed in the step 2) is 7.6g/cm3The inner circumference edge and the outer circumference edge of the annular body 311 are both provided with a 2mm round angle; the density of the stator ring 11 in the step 3) is 7.6g/cm3The inner circumference edge and the outer circumference edge of the annular body 311 are both provided with a 2mm round angle; the temperature of the heat treatment in the step 4) is 700 ℃, and the heat treatment time is 30 min.
Example four:
as shown in fig. 6 to 8, a fourth preferred embodiment of the present invention is shown.
The present embodiment is different from the first embodiment only in that: two stators 1 in the motor, specifically, two stators 1 are located the left and right sides of rotor 2, and be first stator and second stator respectively, first stator is located between first magnetic suspension bearing 31 and rotor 2, the second stator is located between second magnetic suspension bearing 32 and rotor 2, first stator and first magnetic suspension bearing are an organic piece, and first magnetic suspension bearing is located the stator ring of first stator, rotor 2 all is provided with a plurality of permanent magnet 21 along circumference interval arrangement on the left and right sides two surfaces, the rotor of this embodiment all is provided with 10 permanent magnet 21 on the surface. The rotor 2 and the permanent magnet 21 are bonded together by an adhesive. The left and right permanent magnets 21 control the rotation direction of the rotor 2 to be identical by the current when rotating.
The preparation method of the motor comprises the following steps:
1) preparation of soft magnetic composite powder:
annealing soft magnetic composite material powder (iron powder and carbon) at 700-1200 ℃, and then uniformly mixing the iron powder and a phosphoric acid solution, wherein the phosphoric acid solution comprises phosphoric acid and an alcohol solution, and the concentration ratio of the phosphoric acid to the alcohol solution is 1-50%; then adding 1-50% organosilane solution into the mixed solution, heating and drying at 100 ℃, adding 0.1-1.0% release agent by mass after drying, and preparing soft magnetic composite material powder;
2) pressing a magnetic suspension bearing:
pressing the soft magnetic composite material powder into a soft magnetic composite material powder with the density of 7.20-7.6 g/cm3The inner circumference edge and the outer circumference edge of the annular body 311 of the magnetic suspension bearing are both provided with a fillet of 1-2 mm, and then the inner circumference of the annular body 311 of the magnetic suspension bearing is provided with a magnetic pole iron core 312;
3) pressing a stator:
pressing the soft magnetic composite material powder into a soft magnetic composite material powder with the density of 7.20-7.6 g/cm3The inner circumference edge and the outer circumference edge of the stator ring 11 are both formed with a fillet of 1-2 mm, and then 12 coil windings are arranged on the stator ring 11;
4) and (3) heat treatment:
placing the two magnetic suspension bearings and the stator in a sintering furnace, and carrying out heat treatment in the atmosphere of nitrogen, oxygen or air, wherein the heat treatment temperature is 500-700 ℃, and the heat treatment time is 5-30 min;
5) machining:
the dimensions and the precision of the magnetic bearing and the stator after heat treatment are measured, whether machining is needed or not is determined, and finally the annular body 311 of the magnetic bearing and the stator ring 11 of the stator are connected together to form an integral piece.
The magnetic suspension bearing and the stator are integrally designed, so that the structure of the motor is optimized, the space is saved, and the production cost is reduced.
The sintering furnace of each embodiment is one of a mesh belt furnace, a vacuum furnace, a push rod furnace or a bell jar furnace.

Claims (10)

1. The utility model provides a motor with magnetic suspension bearing, including stator, rotor and two magnetic suspension bearings, stator and rotor are located two between the magnetic suspension bearing, and coaxial arrangement, its characterized in that: the magnetic suspension bearing and the stator are both made of soft magnetic composite material powder, and the soft magnetic composite material powder comprises the following components in percentage by mass: c is more than 0 and less than or equal to 1.0 percent, oxygen: o is more than 0 and less than or equal to 0.8 percent, and inevitable impurities: less than or equal to 0.1 percent and the balance of iron.
2. The electric machine of claim 1, wherein: the density of the magnetic suspension bearing and the stator is 7.20-7.6 g/cm3。
3. The electric machine of claim 1, wherein: the stator is positioned between the rotor and one of the magnetic suspension bearings, and the magnetic suspension bearing is connected with the stator through an insulating connecting piece.
4. The electric machine of claim 1, wherein: the number of the stators is two, the stators are positioned on two sides of the rotor, and each stator and the magnetic suspension bearing on the corresponding side are integrated.
5. The electric machine according to any of claims 1 to 4, characterized in that: the magnetic suspension bearing comprises a ring-shaped annular body, a plurality of magnetic pole iron cores which are arranged at intervals along the circumferential direction are arranged on the inner circumference of the annular body, the magnetic pole iron cores extend along the radial direction, a pole shoe is arranged at the tail end of each magnetic pole iron core, and the distance between the pole shoe and the central line of the annular body is 1.0-10.0 mm.
6. A method of manufacturing an electrical machine according to any of claims 2 to 5, comprising the following steps in sequence:
1) preparation of soft magnetic composite powder:
annealing the soft magnetic composite material powder at 700-1200 ℃, then uniformly mixing iron powder and a phosphoric acid solution, then adding an organosilane solution into the mixed solution, standing at normal temperature or heating and drying, and then adding a release agent to prepare the soft magnetic composite material powder;
2) pressing a magnetic suspension bearing:
pressing the soft magnetic composite material powder into a soft magnetic composite material powder with the density of 7.20-7.6 g/cm3The magnetic suspension bearing of (1);
3) pressing a stator:
pressing the soft magnetic composite material powder into a soft magnetic composite material powder with the density of 7.20-7.6 g/cm3The stator of (1);
4) and (3) heat treatment:
and (4) placing the magnetic suspension bearing and the stator in a furnace for heat treatment.
7. The method of claim 6, wherein: the phosphoric acid solution in the step 1) comprises phosphoric acid and alcohol solution, wherein the concentration ratio of the phosphoric acid to the alcohol solution is 1-50%.
8. The method of claim 6, wherein: in the step 1), the concentration of the added organosilane solution is 1-50%, and the amount of the added release agent is 0.1-1.0 wt%.
9. The method of claim 6, wherein: in the step 1), the temperature during heating and drying is 50-100 ℃.
10. The method of claim 6, wherein: in the step 4), the heat treatment temperature is 500-700 ℃, the heat treatment time is 5-30 min, and the heat treatment is carried out in the atmosphere of nitrogen, oxygen or air.
CN202111097594.9A 2021-09-18 2021-09-18 Motor with magnetic suspension bearing and preparation method Pending CN113965010A (en)

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CN202111097594.9A CN113965010A (en) 2021-09-18 2021-09-18 Motor with magnetic suspension bearing and preparation method

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Application Number Priority Date Filing Date Title
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CN113965010A true CN113965010A (en) 2022-01-21

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040135450A1 (en) * 2001-05-18 2004-07-15 Hideki Kanebako Magnetic levitation motor
CN112475288A (en) * 2020-09-30 2021-03-12 东睦新材料集团股份有限公司 Preparation method of soft magnetic composite material for stator
CN112531958A (en) * 2020-12-09 2021-03-19 格瑞拓动力股份有限公司 Magnetic suspension single disc type motor and fan with same
CN213693357U (en) * 2020-07-29 2021-07-13 上海稳得新能源科技有限公司 Magnetic suspension driving motor device in unmanned aerial vehicle power system
CN113161097A (en) * 2021-04-26 2021-07-23 武汉科技大学 Preparation method of high-strength soft magnetic alloy powder material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040135450A1 (en) * 2001-05-18 2004-07-15 Hideki Kanebako Magnetic levitation motor
CN213693357U (en) * 2020-07-29 2021-07-13 上海稳得新能源科技有限公司 Magnetic suspension driving motor device in unmanned aerial vehicle power system
CN112475288A (en) * 2020-09-30 2021-03-12 东睦新材料集团股份有限公司 Preparation method of soft magnetic composite material for stator
CN112531958A (en) * 2020-12-09 2021-03-19 格瑞拓动力股份有限公司 Magnetic suspension single disc type motor and fan with same
CN113161097A (en) * 2021-04-26 2021-07-23 武汉科技大学 Preparation method of high-strength soft magnetic alloy powder material

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