CN110149034A - A kind of preparation method of permanent magnet rotor component - Google Patents
A kind of preparation method of permanent magnet rotor component Download PDFInfo
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- CN110149034A CN110149034A CN201910376077.1A CN201910376077A CN110149034A CN 110149034 A CN110149034 A CN 110149034A CN 201910376077 A CN201910376077 A CN 201910376077A CN 110149034 A CN110149034 A CN 110149034A
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- central spindle
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- preparation
- magnet ring
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- 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
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
Abstract
The present invention relates to a kind of preparation methods of permanent magnet rotor component, belong to motor preparation technical field.The preparation method of permanent magnet rotor component includes the following steps: S1, magnetic powder is made using permanent-magnet alloy in the present invention；S2, rotor assembly A is prepared, the rotor assembly A includes the magnet ring green compact outside centrally located central spindle and iron core, and the magnet ring green compact are made by magnetic powder compression moulding；S3, rotor assembly A is subjected to integral sintered and bulk heat treatmet, the rotor assembly B of iron core and magnet ring one is made；S4, rotor assembly B is machined out, up to permanent magnet rotor component finished product, the preparation method preparation assembling process of permanent magnet rotor component of the present invention is simple and efficient, processable precision is high, good, the preparation cost relative moderate that is assembled into rotor dynamic balance, particularly suitable for high-speed permanent magnet motor.
Description
Technical field
The invention belongs to motor preparation technical fields, are related to a kind of p-m rotor group for motor especially high-speed motor
The preparation method of part.
Background technique
High-speed motor typically refers to the motor that revolving speed is more than 10000r/min, and high-speed motor has the advantage that first is that turning
Fast high, power of motor density is high, and volume is much smaller than common power motor, effectively save can prepare material；Second is that can be with prime mover
It is connected directly, improves transmission efficiency without the use of mechanical variable speed device so as to effectively reduce system vibration and noise；Third is that
Rotary inertia is small, and dynamic response is fast.High-speed motor can be used for high speed grinding machine and other machining tools, High-Speed Flywheel Energy Storage System,
The high speed centrifugation compressor and drum that centrifugal compressor, natural gas transportation and sewage treatment in air circulation refrigeration system use
Blower, the gas turbine drives high-speed engine of distributed power supply system and aerospace field etc..Due to high-speed motor
Many advantages and wide application prospect, have become the research hotspot of motor field at present.
However since rotor speed is very high during operation for high-speed motor, the Mass Distribution and magnetic force distribution of rotor are such as
Fruit is uneven, and when rotor speed is near or above critical speed, entire rotor includes that rotor-bearing system is all very big by generation
Vibration, this vibration will generate fatal influence to high-speed motor, therefore keep the dynamic balancing of its rotor extremely important.
P-m rotor currently used for high-speed motor is that mainly have by the way that alinco assembled to be prepared on iron mandrel surface
Two kinds of assembly methods.
First way be by magnetic shoe (tile-shaped magnet steel) by motor requirement one by one Surface Mount on iron mandrel surface, magnetic shoe and
It is fixed between iron mandrel by high-temperature plastic, forms an annulus on iron mandrel surface after magnetic shoe splicing, then use carbon fiber
Material winds entire annulus periphery and is reinforced, and in alloy circle set of the peripheral elastic conjunction of carbon fibre material without magnetic, obtains
P-m rotor.This mode assembling process is complicated, inefficiency；There are gaps between magnet steel and magnet steel, and it is existing that there are serious leakage fields
As causing magnet steel utilization rate not high；Also it is unfavorable for dynamic balancing when rotor runs at high speed to keep；The processing of magnetic shoe is cut frequently with line
The mode for cutting or forming mill is made, and since magnet steel is fragile material, machining recovery rate is not high, leads to the machining cost of magnetic shoe
It is higher.The reason of elastic conjunction further reinforces permanent magnetic rotor for high-speed electric machine without the alloy circle set of magnetic is permanent-magnet material
Centrifugation disintegration may occur in high-speed motor rotation process for resistance to compression not tension, and general motor is without assembling the alloy without magnetic
Circle set.
The second way is first to cover magnet ring outside iron mandrel, and intermediate gap encapsulating is bonded and fixed, and is then existed
Magnet ring periphery elastic conjunction covers to arrive the two poles of the earth p-m rotor without the alloy circle of magnetic.Since magnet ring is fragile material, pressure resistance intolerant to
It draws, cannot be assemblied in iron mandrel in a manner of interference, it is otherwise easily broken, therefore the mode that encapsulating can only be taken to assemble makes magnet ring
It is fixed together with iron mandrel.This mode is to the more demanding of glue, during subsequent run at high speed or long-play
There is the risk that aging falls off in the process；Although high-efficient compared to magnetic shoe Surface Mount mode, efficiency is still to be improved；In addition existing
There is the preparation of technology middle magnetic ring more difficult, preparation cost is higher than the preparation cost of magnetic shoe, leads to this kind of method higher cost.
Therefore, the cost of reduction magnet ring and corresponding rotor is always that the hot spot of high-speed motor researcher care is asked
Topic.
Summary of the invention
The purpose of the present invention is in view of the above-mentioned problems existing in the prior art, propose a kind of preparation of permanent magnet rotor component
Method, preparation assembling process is simple and efficient, processable precision is high, is assembled into that rotor dynamic balance is good, preparation cost is opposite
It is cheap, particularly suitable for high-speed permanent magnet motor.
Object of the invention can be realized by the following technical scheme:
A kind of preparation method of permanent magnet rotor component, the preparation method include the following steps:
S1, magnetic powder is prepared, the magnetic powder is made of permanent-magnet alloy；
S2, rotor assembly A being prepared, the rotor assembly A includes the magnet ring green compact outside centrally located central spindle and iron core,
The magnet ring green compact are made by magnetic powder compression moulding；
S3, rotor assembly A is subjected to integral sintered and bulk heat treatmet, the rotor assembly B of iron core and magnet ring one is made；
S4, rotor assembly B is machined out to get permanent magnet rotor component finished product.
The present invention has abandoned the machining preparation process of traditional magnet steel and the alinco assembled process that subsequent complexity is inefficient, so that
One step of permanent magnet rotor component is prepared in place, and precision height can be processed in the permanent magnet rotor component of preparation, and dynamic balance is good, especially suitable for
High-speed permanent magnet motor, and preparation cost relative moderate.
Due to burning of the magnet ring (containing radial magnetic ring, axial magnet ring and radiation magnetic loop) in independent sintering process in all directions
It is different to tie shrinkage character, causes magnet ring inside after cooling that can generate very big internal stress, is being sintered to easily lead to magnet ring
It cracks afterwards or in machining process.Magnet ring and central spindle are sintered by the present invention together, and central spindle plays a supporting role to magnet ring green compact, energy
The internal stress of magnet ring is enough greatly decreased, thus effectively avoid sintering after or machining process middle magnetic ring cracking.In addition work as central spindle
It is anti-that certain counterdiffusion can be generated when suitable material being selected to be made, in sintering process between central spindle and the material of magnet ring green compact
It answers, and then is bonded together, the machining and alinco assembled process of subsequent magnet can be removed from, reduce process, improve system
Standby efficiency.Rotor assembly obtained can be integrally used in motor through simple machining after sintering heat treatment, can also lead to magnet ring
The method of over mechanical processing is peeled away from central spindle, is reassembled other central spindle and is made rotor, thus it is provided by the invention forever
The preparation method of magnetic rotor component can also be used for the preparation of magnet ring, adopts this method and prepares magnet ring, due to that can substantially reduce magnetic
Ring opening probability, therefore the yield rate of magnet ring can be greatly improved.
Preferably, the permanent-magnet alloy be Rare-Earth Cobalt based permanent magnetic material or rare-earth iron-based permanent-magnetic material, it is described dilute
Native cobalt-based permanent-magnet material is 1:5 type Rare-Earth Cobalt based permanent magnetic material or 2:17 type Rare-Earth Cobalt based permanent magnetic material.
Further preferably, the chemical molecular formula of the Rare-Earth Cobalt based permanent magnetic material is (Sm1-xRx)(Co1-yMy)z, R Y,
One or more rare earth elements of La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, the range of x are 0~0.8；M
It is one or more for Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Al, In, Sn, Ag, Au, Mo, Nb, Zr, Hf, Ta, W and Si, the model of y
Enclosing for the range of 0.1~0.5, z is 4.2~8.5.
Further preferably, the chemical molecular formula of the rare-earth iron-based permanent-magnetic material is (Nd100-xRx)11-18(Fe100-yMy)balB5-6.5, wherein R is one or more rare earth elements of Y, La, Ce, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, x
Range be 0~80；M is Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Al, In, Sn, Ag, Au, Mo, Nb, Zr, Hf, Ta, W it is a kind of or
Multiple element, the range of y are 0~20.
Preferably, the process for preparing magnetic powder described in the step S1 is, permanent magnetism is prepared according to element proportion melting and is closed
Golden ingot casting or slab, then by the broken magnetic powder that diameter is made and is 2 μm~6 μm of hard magnetic alloy ingot or slab.
Preferably, first hard magnetic alloy ingot or slab are passed through during preparing magnetic powder described in the step S1
Mechanical Crushing or the broken average particle size that is made of hydrogen are 50 μm~300 μm of powder, then powder is prepared into 2 μm~6 μ by airflow milling
The magnetic powder of m.
Preferably, the hydrogen is broked into hard magnetic alloy ingot when permanent-magnet alloy is Rare-Earth Cobalt based permanent magnetic material
Or slab inhales hydrogen 1h~10h in the hydrogen pressure of 0.1MPa~0.5MPa, is then taken off in 200 DEG C~350 DEG C heat preservation 0h~5h
Hydrogen；
When permanent-magnet alloy is rare-earth iron-based permanent-magnetic material, the hydrogen be broked by hard magnetic alloy ingot or slab in
Hydrogen 1h~10h is inhaled in the hydrogen pressure of 0.1MPa~0.5MPa, then carries out dehydrogenation in 200 DEG C~350 DEG C heat preservation 2h~5h, then at
400 DEG C~650 DEG C heat preservation 1h~3h carry out dehydrogenation.
Rare-Earth Cobalt based permanent magnetic material is very easy to dehydrogenation during the sintering process, therefore the present invention is with Rare-Earth Cobalt based permanent magnetic material
When for magnet ring raw material, breaking the dehydrogenation time in process in hydrogen be can choose 0 hour, i.e. not dehydrogenation, in the subsequent sintering process together
When complete dehydrogenation step.
Preferably, the preparation method of magnet ring green compact described in the step S2 is that the magnetic powder is existed centered on central spindle
Simultaneously compression moulding is formed in the magnet ring green compact of central spindle periphery, obtains permanent magnet rotor component A orientation around central spindle under magnetic field；
Or by magnetic powder, individually simultaneously compression moulding is hollow magnet ring green compact to orientation under magnetic field, then central spindle is assembled to magnet ring
The hollow position of green compact obtains permanent magnet rotor component A.
Preferably, the magnetic field strength being orientated under magnetic field is 1T~4T.
Preferably, the material of the central spindle is permeability alloys steel, it is low equipped with one layer between the central spindle and magnet ring green compact
Melting alloy piece.
Preferably, the low-melting alloy piece with a thickness of 0.05mm~10mm.
One layer of low-melting alloy piece is arranged in the present invention between central spindle and magnet ring green compact, can enhance axis during the sintering process
Reaction-diffusion terms between core and magnet ring green compact, so that associativity is more preferable after sintering for central spindle and magnet ring.
Preferably, the low-melting alloy piece is copper sheet when the permanent-magnet alloy is Rare-Earth Cobalt based permanent magnetic material,
When the permanent-magnet alloy is rare-earth iron-based permanent-magnetic material, the low-melting alloy piece is aluminium flake or copper sheet.
The present invention is avoided by the material of preferred low-melting alloy thin slice because improperly outer added elements are into magnet ring green compact
The coercitive deterioration of magnet caused by spreading.
Preferably, the relative permeability μ of the permeability alloys steelrGreater than 160, further preferably, the permeability alloys
The relative permeability μ of steelrGreater than 1000.
Present invention selection has the permeability alloys Steel material of high relative permeability, and the magnetic field on p-m rotor surface can be improved
Intensity.
Preferably, the shape of the central spindle is round, circular ring shape, oval strip, rectangular strip, polygon strip or its
His shape.
The shape of central spindle needs to design according to motor in the present invention, can be various shape.
Preferably, the central spindle is hollow axial core, further preferably circular central spindle.
Preferably, the interstitial hole of central spindle can be circle when the central spindle is hollow axial core, or rectangular,
Ellipse, polygon or other shapes, depending on the design of motor.
Since central spindle is different from magnet ring material, heat treatment process is also inevitable different, for the heat treatment process meeting of magnet ring
The decline for leading to central spindle mechanical strength, when preparing rotor assembly (i.e. the central spindle and magnet ring one) of included central spindle, intensity decline
Central spindle can be used for general motor, but be not suitable as that rotor quality is larger or the central spindle of the extra high p-m rotor of revolving speed makes
With.Therefore the preferred hollow axial core of the present invention reserves axis hole position at central spindle center, can make in the high-intensitive central spindle of subsequent assembly
For transmission effect.
Preferably, the material of the central spindle be heat-resisting material, the heat-resisting material include superalloy, molybdenum alloy,
Tungsten alloy, refractory ceramics；Either first pass through the method shape of magnetron sputtering, CVD or ion plating in advance on the central spindle surface
At there is high-temperature-resistant layer.
Preferably, the high-temperature-resistant layer includes TiN layer, TiC layer or ZrO2Layer.
Preferably, the tolerable temperature of the heat-resisting material or high-temperature-resistant layer is higher than the sintering temperature of magnet ring by least 30
DEG C, further preferably, the tolerable temperature of the heat-resisting material or high-temperature-resistant layer is at least 50 DEG C higher than the sintering temperature of magnet ring.It is resistance to
The tolerable temperature of high-temperature material or high-temperature-resistant layer refers under the sintering temperature of magnet ring, heat-resisting material or high-temperature-resistant layer and magnet ring
Between will not occur substantially molecule diffusion or only occur trace molecule diffusion.
The present invention presets one layer of high temperature resistant as central spindle material, or on central spindle surface directly using heat-resisting material
Layer, can weaken the diffusion reaction between magnet ring and central spindle, facilitate and eject central spindle among magnet ring, more particularly suitable to install
Central spindle.
Preferably, also having the step of carrying out isostatic pressing to magnet ring green compact after the magnet ring green compact compression moulding.
Preferably, the pressure of the equal static pressure is 100MPa~400MPa, the dwell time is 30s~1000s.
Requirement of the molding mode of magnet ring green compact of the present invention to molding equipment can be high or low, when the molding mode of magnet ring green compact
It is closely knit to the underpressing of green compact when requirement to molding equipment is lower, it can be higher close to obtain by isostatic pressing
Degree, is conducive to follow-up sintering.
Preferably, when the permanent-magnet alloy is 1:5 type Rare-Earth Cobalt based permanent magnetic material, it is whole described in the step S3
Body, which is sintered to, is warming up to 1100 DEG C~1150 DEG C sintering 1h~6h for rotor assembly A, and the bulk heat treatmet is will be sintered
Rotor assembly A is first cooled to 830 DEG C~900 DEG C heat preservation 0.5h~3h with 0.1 DEG C/min~1 DEG C/min cooling rate, then with
The cooling rate of 10 DEG C/min~100 DEG C/min is cooled to room temperature；
It is integral sintered described in the step S3 to be when the permanent-magnet alloy is 2:17 type Rare-Earth Cobalt based permanent magnetic material
Rotor assembly A is warming up to 1180 DEG C~1250 DEG C sintering 1h~6h, the bulk heat treatmet is by sintered rotor assembly A
First it is cooled to after 1100 DEG C~1200 DEG C heat preservation 1h~5h with 1 DEG C/min~4 DEG C/min cooling rate with 10 DEG C/min~100
DEG C/cooling rate of min is cooled to room temperature, then is warming up to 750 DEG C~860 DEG C heat preservation 5h~40h, then with 0.1 DEG C/min~2
DEG C/the cooling rate slow cooling of min to 400 DEG C~500 DEG C heat preservation 1h~5h, later with 10 DEG C/min~100 DEG C/min cooling speed
Degree is cooled to room temperature；
When the permanent-magnet alloy is rare-earth iron-based permanent-magnetic material, integral sintered described in the step S3 is by rotor
Component A is warming up to 1050 DEG C~1120 DEG C sintering 1h~6h, and the bulk heat treatmet is first with 10 DEG C/min~100 DEG C/min drop
Warm speed is cooled to room temperature, then heats to heat preservation 2h~7h at 850 DEG C~950 DEG C, and with 10 DEG C/min~100 DEG C/min
Cooling rate is cooled to room temperature, then is warming up to 450 DEG C~600 DEG C heat preservation 3h~10h, and with 10 DEG C/min~100 DEG C/min
Cooling rate is cooled to room temperature.
Preferably, the cooling rate being cooled to room temperature is 10 when preparing the permanent magnet rotor component of included central spindle
DEG C/min~50 DEG C/min；When preparation only with magnet ring rotor assembly when, the cooling rate being cooled to room temperature be 50 DEG C/
Min~100 DEG C/min.
The cooling rate the fast more is conducive to improve the magnetic property of rare earth permanent-magnetic material, but too fast cooling rate is to equipment
Requirement it is excessively high, be that magnet ring and central spindle are sintered and are heat-treated together simultaneously for permanent magnet rotor component of the invention, due to magnet ring
Both different with the thermal expansion coefficient of internal central spindle, too fast cooling rate, which will lead to, generates therebetween larger internal stress, make
Binding site generates cracking or loosens.Therefore when preparing the permanent magnet rotor component of included central spindle, preferably 10 DEG C of cooling rate/
Within the scope of min~50 DEG C/min.If subsequent need to take out central spindle, faster cooling velocity, i.e. 50 DEG C/min can choose
~100 DEG C/min.
Preferably, machining described in the step S4 includes by permanent magnet rotor component B by motor assembly demand processing
At corresponding size shape, tolerance and surface roughness state.
Preferably, machining described in the step S4 is included in the magnet ring setting multiple tracks circumferential direction dent, dent portion
Divide and is filled with resin or high-temp glue.
Further preferably, the quantity of the dent in the step S4 is 2~20, and the width of dent is 0.1mm~5mm,
Dent depth accounts for the 1/4~3/4 of magnet ring radial thickness.
(circumferential dent direction is vertical with magnet axial direction, along outer in magnet ring surface setting multiple tracks circumferential direction dent by the present invention
Circle one week), magnet ring is divided into multiple portions, advantageously reduces the vortex generated during motor runs at high speed.Specific dent
Quantity and gap size can be depending on the vortex situations generated when the operation of motor.Indented portion is filled out with resin or high-temp glue
It fills, it is therefore an objective to magnet ring be reinforced, the reduction for leading to magnet ring intensity because of the setting of dent is avoided.
Preferably, machining described in the step S4 includes taking out the central spindle in rotor assembly B.
Further preferably, machining described in the step S4 includes ejecting the central spindle in rotor assembly B using tool.
After the present invention by being sintered preparation for central spindle and magnet ring together, then by the method for machining by central spindle from magnet ring
On peel away, leave behind periphery flux ring portion, can need to assemble other central spindles according to motor to be assembled into rotor, can also
The method is only used for the preparation of magnet ring.
Compared with prior art, the invention has the following advantages:
(1) compared to the preparation method of traditional permanent magnet rotor component, the present invention has abandoned the machining process of magnet steel and has answered
The assembling process of miscellaneous inefficient magnetic shoe or magnet ring and central spindle is simple and efficient so that the preparation of one step of permanent magnet rotor component is in place, is prepared
Relative inexpensiveness, process is easily operated and industrialization.
(2) preparation method of the invention can also be used for low cost and prepare magnet ring, and this magnet ring itself can also be used as permanent magnetism
The components of rotor.
(3) precision height can be processed in preparation method of the invention, and the binding force between magnet ring and central spindle is good, due to being a step system
Standby the Mass Distribution of p-m rotor various pieces is highly uniform, and the dynamic balance of rotor is good in place, particularly suitable for permanent magnetism high speed
Motor.
Figure of description
Fig. 1 is permanent magnet rotor component finished product structure schematic diagram made from the embodiment of the present invention 1~3,5~9.
Fig. 2 is permanent magnet rotor component finished product structure schematic diagram made from the embodiment of the present invention 4.
Figure label is respectively as follows: central spindle 1, magnet ring 2.
Specific embodiment
The following is specific embodiments of the present invention, and technical scheme of the present invention will be further described, but the present invention is simultaneously
It is not limited to these embodiments.
Embodiment 1
The preparation method of permanent magnet rotor component is specific as follows in the present embodiment:
(1) melting permanent-magnet alloy
Select the trade mark for the 1:5 type Rare-Earth Cobalt based permanent magnetic material of 22H, chemical molecular formula SmCo4.6, it is smelted into
Ingot casting.
(2) powder processed
Ingot casting is that hydrogen 5h is inhaled in the hydrogen pressure of 0.3MPa, average particle size is obtained and is 200 μm of powder, then powder is carried out
Airflow milling obtains the magnetic powder that average particle size is 4.8 μm.
(3) permanent magnet rotor component A is prepared
By magnetic powder, individually simultaneously compression moulding is hollow radial magnetic ring green compact to orientation under the magnetic field 2T, then quiet in 250MPa etc.
Fine and close magnet ring green compact are formed after pressure pressure maintaining 100s, the annulus central spindle for being enclosed with one layer of 0.3mm thickness copper sheet is assembled to magnet ring
The hollow position of green compact obtains permanent magnet rotor component A, and wherein the material of annulus central spindle is permeability alloys steel, relative permeability μr
It is 2500, tensile strength 650MPa.
(4) it is sintered and is heat-treated
It is sintered to and permanent magnet rotor component A is warming up to 1124 DEG C of sintering 2.5 hours；
Heat treatment is that sintered rotor assembly A is first cooled to 850 DEG C of heat preservation 1h with the cooling rate of 0.3 DEG C/min,
It is cooled to room temperature again with the cooling rate of 30 DEG C/min, obtains the permanent magnet rotor component B of central spindle and magnet ring one；
(5) it machines
Permanent magnet rotor component B is subjected to inside and outside circle mill processing according to motor assembly demand and obtains permanent magnet rotor component finished product,
Its structure is as shown in Figure 1.Embodiment 2
Embodiment 2
The preparation method of permanent magnet rotor component is specific as follows in the present embodiment:
(1) melting permanent-magnet alloy
Select the trade mark for the 2:17 type Rare-Earth Cobalt based permanent magnetic material of 30H, chemical molecular formula Sm
(CobalFe0.24Cu0.065Zr0.03)7.85, it is smelted into ingot casting.
(2) powder processed
Ingot casting is that hydrogen 5h is inhaled in the hydrogen pressure of 0.3MPa, ingot casting after suction hydrogen is then subjected to dehydrogenations in 290 DEG C of heat preservation 3h,
Obtain the powder that average particle size is 150 μm；Powder progress airflow milling is obtained into the magnetic powder that average particle size is 4.2 μm again.
(3) permanent magnet rotor component A is prepared
By magnetic powder, individually simultaneously compression moulding is hollow radial magnetic ring green compact to orientation under the magnetic field 2T, then quiet in 250MPa etc.
Fine and close magnet ring green compact are formed after pressure pressure maintaining 100s, the annulus central spindle for being enclosed with one layer of 0.3mm thickness copper sheet is assembled to magnet ring
The hollow position of green compact obtains permanent magnet rotor component A, and wherein the material of annulus central spindle is permeability alloys steel, relative permeability μr
It is 2500, tensile strength 655MPa.
(4) it is sintered and is heat-treated
It is sintered to and permanent magnet rotor component A is warming up to 1200 DEG C of sintering 2.5 hours；
After sintered rotor assembly A is first is cooled to 1180 DEG C of heat preservation 3h with the cooling rate of 1 DEG C/min by heat treatment
It is cooled to room temperature with the cooling rate of 30 DEG C/min, then is warming up to 830 DEG C of heat preservation 15h, then with the cooling rate of 0.7 DEG C/min
Slow cooling is cooled to room temperature later with 30 DEG C/min cooling rate, the permanent magnetism for obtaining central spindle and magnet ring one turns to 400 DEG C of heat preservation 3h
Sub-component B.
(5) it machines
Permanent magnet rotor component B is subjected to inside and outside circle mill processing according to motor assembly demand and obtains permanent magnet rotor component finished product,
Its structure is as shown in Figure 1.
Embodiment 3
The preparation method of permanent magnet rotor component is specific as follows in the present embodiment:
(1) melting permanent-magnet alloy
Select the trade mark for the rare-earth iron-based permanent-magnetic material of N38UH, chemical molecular formula is (Nd69.32Pr17.74Dy12.94)13.11
(Fe97.06Co2.04Al0.54Cu0.13Zr0.06Ga0.17)81.12B5.77, it is smelted into slab.
(2) powder processed
Hydrogen 5h is inhaled in hydrogen pressure by slab in 0.15MPa, then takes off the slab after suction hydrogen in 320 DEG C of heat preservation 2.5h
Hydrogen carries out dehydrogenation then at 580 DEG C of heat preservation 2h, and average particle size is made and is 100 μm of powder, then is prepared into powder by airflow milling
3.1 μm of magnetic powder.
(3) permanent magnet rotor component A is prepared
By magnetic powder, individually simultaneously compression moulding is hollow radial magnetic ring green compact to orientation under the magnetic field 2T, then quiet in 200MPa etc.
Fine and close magnet ring green compact are formed after pressure pressure maintaining 60s, it is raw that the annulus central spindle for being enclosed with one layer of 0.3mm thickness copper sheet is assembled to magnet ring
The hollow position of base obtains permanent magnet rotor component A, and wherein the material of annulus central spindle is permeability alloys steel, relative permeability μrFor
2500, tensile strength 643MPa.
(4) it is sintered and is heat-treated
It is sintered to and rotor assembly A is warming up to 1070 DEG C of sintering 5h；
Heat treatment then heats to for sintered rotor assembly A is first cooled to room temperature with 30 DEG C/min cooling rate
Keep the temperature 3h at 890 DEG C, and be cooled to room temperature with the cooling rate of 30 DEG C/min, then be warming up to 490 DEG C of heat preservation 5h, and with 30 DEG C/
The cooling rate of min is cooled to room temperature, and obtains the permanent magnet rotor component B of central spindle and magnet ring one.
(5) it machines
Permanent magnet rotor component B is subjected to inside and outside circle mill processing according to motor assembly demand and obtains permanent magnet rotor component finished product,
Its structure is as shown in Figure 1.
Embodiment 4
Embodiment 4 the difference from example 2 is that, the central spindle used in step (3) for solid cylinder central spindle, filled circles
The tensile strength of axis of a cylinder core is 658MPa, correspondingly, only processing permanent magnet rotor component B progress peripheral milling in step (5) to obtain the final product
To permanent magnet rotor component finished product, other are same as Example 2, and permanent magnet rotor component finished product structure is as shown in Figure 2.
Embodiment 5
Embodiment 5 the difference from example 2 is that, the annulus central spindle in step (3) does not wrap up low-melting alloy piece copper sheet,
In step (5) central spindle is extracted completely with sets of holes technique, then inside and outside mill processing is carried out to remaining magnet ring, obtains p-m rotor group
Part finished product, i.e. magnet ring, other are same as Example 2.
Embodiment 6
Embodiment 6 and the difference of embodiment 5 are that the central spindle in step (3) is made of high temperature ceramic material, the height
The tolerable temperature of warm ceramic material is 70 DEG C higher than the sintering temperature of magnet ring, other are same as Example 5.
Embodiment 7
Embodiment 7 and the difference of embodiment 5 are, in step (4), all cooling velocities being cooled to room temperature be 100 DEG C/
Min, other are same as Example 5.
Embodiment 8
The magnet ring of permanent magnet rotor component B is first passed through multi-wire cutting the difference from example 2 is that in step (5) by embodiment 8
The score that method cuts 6 0.2mm wide is cut, score depth is the 2/3 of magnet ring radial thickness, and score position is filled out with fire resistant resin
It fills, then carries out inside and outside circle mill processing, obtain permanent magnet rotor component finished product, other are same as Example 2.
Embodiment 9
For embodiment 9 the difference from example 2 is that in step (3), the preparation method of magnet ring green compact is centered on central spindle
Magnetic powder is orientated under magnetic field and compression moulding is around central spindle, is formed in the magnet ring green compact of central spindle periphery, then isostatic pressing
Permanent magnet rotor component A is obtained, other are same as Example 2.
Comparative example 1
1 embodiment 5 of comparative example, which is distinguished, to be, the unassembled central spindle of magnet ring green compact obtained in step (3), correspondingly, step
(4) only magnet ring green compact are sintered and are heat-treated in, only magnet ring inside and outside circle mill processing, other and 2 phase of embodiment in step (5)
Together.
In other embodiment of the invention, when the permanent-magnet alloy in step (1) be 1:5 type rare earth cobalt-based forever
When magnetic material, in step (2) hydrogen pressure can also be 0.1MPa, 0.2MPa, 0.4MPa, 0.5MPa and 0.1MPa~0.5MPa it
Between any value；The suction hydrogen time can also be any value between 1h, 3h, 7h, 10h and 1h~10h；It is obtained after hydrogen is broken
Powder mean particle sizes can also be any value between 50 μm, 100 μm, 150 μm, 250 μm, 300 μm and 50 μm~300 μm；
The average particle size of magnetic powder obtained can also be any value between 2 μm, 3 μm, 4 μm, 6 μm and 2 μm~6 μm after airflow milling；
The magnetic field strength being orientated in step (3) can also be any value between 1T, 3T, 4T and 1T~4T；Equal static pressure
Pressure can also be any value between 100MPa, 200MPa, 300MPa, 400MPa and 100MPa~400MPa；Etc. quiet
The pressure dwell time can also be any value between 30s, 200s, 500s, 700s, 1000s and 30s~1000s；Central spindle table
The thickness that bread wraps up in copper sheet can also be 0.05mm, 0.1mm, 0.5mm, 1mm, 3mm, 6mm, 10mm and 0.05mm~10mm it
Between any value；The relative permeability μ of central spindlerIt can also be 1000,1500,2000 and any value greater than 160；Central spindle
Tensile strength can also be 500MPa, 600MPa, 700MPa and greater than any value between 500MPa；The interstitial hole of central spindle can
To be round, or rectangular, oval, polygon etc., depending on the design of motor；
In step (4), sintering temperature can also be 1100 DEG C, 1110 DEG C, 1120 DEG C, 1130 DEG C, 1140 DEG C, 1150 DEG C and
Any value between 1100 DEG C~1150 DEG C；Sintering time can also be between 1h, 2h, 3h, 4h, 5h, 6h and 1h~6h
Any value；Heat treatment first time cooling process cooling rate can also be 0.1 DEG C/min, 0.2 DEG C/min, 0.5 DEG C/min,
Any value between 0.7 DEG C/min, 1.0 DEG C/min and 0.1 DEG C/min~1 DEG C/min, cooling terminal can also be 830 DEG C,
Any value between 840 DEG C, 860 DEG C, 870 DEG C, 890 DEG C, 900 DEG C and 830 DEG C~900 DEG C, soaking time can also be
Any value between 0.5h, 1.5h, 2h, 2.5h, 3h and 0.5h~3h；The cooling rate of second of cooling process can also be
10 DEG C/min, 20 DEG C/min, 40 DEG C/min, 60 DEG C/min, 80 DEG C/min, 100 DEG C/min and 10 DEG C/min~100 DEG C/min
Between any value, in the present embodiment between the cooling rate preferably 10 DEG C/min~50 DEG C/min.
In other embodiment of the invention, when the permanent-magnet alloy in step (1) is 2:17 type rare earth cobalt-based
Permanent-magnet material, when step (2) in hydrogen pressure can also be 0.1MPa, 0.2MPa, 0.4MPa, 0.5MPa and 0.1MPa~0.5MPa
Between any value；The suction hydrogen time can also be any value between 1h, 3h, 7h, 10h and 1h~10h；The temperature of dehydrogenation
It can also be any value between 200 DEG C, 230 DEG C, 250 DEG C, 300 DEG C, 350 DEG C and 200 DEG C~350 DEG C, the heat preservation of dehydrogenation
Time can also be any value between 0,1h, 2h, 4h, 5h and 0~5h；Powder mean particle sizes obtained can be with after hydrogen is broken
It is any value between 50 μm, 100 μm, 200 μm, 250 μm, 300 μm and 50 μm~300 μm；Magnetic powder obtained after airflow milling
Average particle size can also be any value between 2 μm, 3 μm, 5 μm, 6 μm and 2 μm~6 μm；
The magnetic field strength being orientated in step (3) can also be any value between 1T, 3T, 4T and 1T~4T；Equal static pressure
Pressure can also be any value between 100MPa, 200MPa, 300MPa, 400MPa and 100MPa~400MPa；Etc. quiet
The pressure dwell time can also be any value between 30s, 200s, 500s, 700s, 1000s and 30s~1000s；Central spindle table
The thickness that bread wraps up in copper sheet can also be 0.05mm, 0.1mm, 0.5mm, 1mm, 3mm, 6mm, 10mm and 0.05mm~10mm it
Between any value；The relative permeability μ of central spindlerIt can also be 1000,1500,2000 and any value greater than 160；Central spindle
Tensile strength can also be 500MPa, 600MPa, 700MPa and any value greater than 500MPa；The interstitial hole of central spindle can be
It is round, or rectangular, oval, polygon etc., depending on the design of motor；
In step (4), sintering temperature can also be 1180 DEG C, 1190 DEG C, 1200 DEG C, 1210 DEG C, 1230 DEG C, 1250 DEG C and
Any value between 1180 DEG C~1250 DEG C；Sintering time can also be between 1h, 2h, 3h, 4h, 5h, 6h and 1h~6h
Any value；
The cooling rate of heat treatment first time cooling process can also be and 2 DEG C/min3 DEG C/min, 4 DEG C/min and 1
DEG C/min~4 DEG C/min between any value, cooling outlet temperature can also be 1100 DEG C, 1130 DEG C, 1150 in addition to 1180 DEG C
DEG C, 1180 DEG C, any value between 1200 DEG C and 1100 DEG C~1200 DEG C, soaking time can also be in addition to 3h 1h, 2h,
The cooling rate of any value between 4h, 5h and 1h~5h, second of cooling process (being cooled to room temperature) removes 30 DEG C/min
It can also be 10 DEG C/min, 20 DEG C/min, 40 DEG C/min, 60 DEG C/min, 80 DEG C/min, 100 DEG C/min and 10 DEG C/min outside
Any value between~100 DEG C/min, the cooling rate preferably 10 DEG C/min~50 DEG C/min in the present embodiment；Next
In first time temperature program, heating terminal can also be in addition to 830 DEG C 750 DEG C, 770 DEG C, 800 DEG C, 850 DEG C, 860 DEG C and
Any value between 750~860 DEG C, soaking time can also be in addition to 15h 5h, 10h, 20h, 25h, 30h, 35h, 40h and
Any value between 5h~40h；In third time cooling process, cooling rate can also be 0.1 DEG C/min, 0.3 except 0.7 DEG C/min
DEG C/min, 0.5 DEG C/min, 1 DEG C/min, 1.5 DEG C/min, any value between 2 DEG C/min and 0.1~2 DEG C/min, cooling is eventually
It o'clock can also be any value between 410 DEG C, 430 DEG C, 480 DEG C, 500 DEG C and 400 DEG C~500 DEG C in addition to 400 DEG C, when heat preservation
Between can also be any value between 1h, 2h, 4h, 5h and 1h~5h in addition to 3h；4th cooling process (last cooling journey
Sequence) in, cooling rate can also be in addition to 30 DEG C/min 10 DEG C/min, 20 DEG C/min, 40 DEG C/min, 60 DEG C/min, 80 DEG C/
Any value between min, 100 DEG C/min and 10 DEG C/min~100 DEG C/min, cooling rate preferably 10 in the present embodiment
DEG C/min~50 DEG C/min between.
In other embodiment of the invention, when the permanent-magnet alloy in step (1) is rare-earth iron-based permanent magnetism material
When material, hydrogen pressure be can also be between 0.1MPa, 0.2MPa, 0.4MPa, 0.5MPa and 0.1MPa~0.5MPa in step (2)
Any value；The suction hydrogen time can also be any value between 1h, 3h, 7h, 10h and 1h~10h；The temperature of dehydrogenation can be with
It is any value between 200 DEG C, 230 DEG C, 250 DEG C, 300 DEG C, 350 DEG C and 200 DEG C~350 DEG C, the soaking time of dehydrogenation is also
It can be any value between 0,1h, 2h, 4h, 5h and 0~5h；Powder mean particle sizes made from after hydrogen is broken can also be 50 μ
M, any value between 100 μm, 200 μm, 250 μm, 300 μm and 50 μm~300 μm；Magnetic powder obtained is averaged after airflow milling
Granularity can also be any value between 2 μm, 3 μm, 5 μm, 6 μm and 2 μm~6 μm；
The magnetic field strength being orientated in step (3) can also be any value between 1T, 3T, 4T and 1T~4T；Equal static pressure
Pressure can also be any value between 100MPa, 200MPa, 300MPa, 400MPa and 100MPa~400MPa；Etc. quiet
The pressure dwell time can also be any value between 30s, 200s, 500s, 700s, 1000s and 30s~1000s；Central spindle table
The copper sheet that bread is wrapped up in may be replaced by aluminium flake, the thickness of central spindle surface package copper sheet can also be 0.05mm, 0.1mm,
Any value between 0.5mm, 1mm, 3mm, 6mm, 10mm and 0.05mm~10mm；The relative permeability μ of central spindlerIt can also be
1000,1500,2000 and any value greater than 160；The tensile strength of central spindle can also be 500MPa, 600MPa, 700MPa
And greater than any value between 500MPa；The interstitial hole of central spindle can be circle, or rectangular, oval, polygon
Deng depending on the design of motor；
In step (4), sintering temperature can also be 1050 DEG C, 1060 DEG C, 1080 DEG C, 1100 DEG C, 1120 DEG C in addition to 1070 DEG C
And any value between 1050 DEG C~1120 DEG C；Sintering time can also be between 1h, 2h, 3h, 4h, 6h and 1h~6h
Any value；
Sintered rotor assembly A is first cooled to room temperature with 30 DEG C/min cooling rate, then heats at 890 DEG C and keeps the temperature
3h, and be cooled to room temperature with the cooling rate of 30 DEG C/min, then be warming up to 490 DEG C of heat preservation 5h, and with the cooling of 30 DEG C/min speed
Degree is cooled to room temperature, and obtains the permanent magnet rotor component B of central spindle and magnet ring one.
Heat treatment first time cooling process (being cooled to room temperature) cooling rate can also be in addition to 30 DEG C/min 10 DEG C/
Min, 20 DEG C/min, 40 DEG C/min, 60 DEG C/min, 80 DEG C/min, between 100 DEG C/min and 10 DEG C/min~100 DEG C/min
Any value, the cooling rate preferably 10 DEG C/min~50 DEG C/min in the present embodiment；In next first time temperature program
In, heating terminal can also be 850 DEG C, 860 DEG C, 880 DEG C, 900 DEG C, 920 DEG C, 950 DEG C and 850 DEG C~950 in addition to 890 DEG C
Any value between DEG C, soaking time can also be any value between 2h, 4h, 5h, 6h, 7h and 2h~7h in addition to 3h；The
In reducing temperature twice program (being cooled to room temperature), cooling rate can also be 10 DEG C/min, 20 DEG C/min, 40 in addition to 30 DEG C/min
DEG C/min, 60 DEG C/min, 80 DEG C/min, any value between 100 DEG C/min and 10 DEG C/min~100 DEG C/min, this implementation
The cooling rate preferably 10 DEG C/min~50 DEG C/min in example；In second of temperature program, heating terminal may be used also in addition to 490 DEG C
To be any value between 450 DEG C, 460 DEG C, 480 DEG C, 510 DEG C, 550 DEG C, 600 DEG C and 450 DEG C~600 DEG C, soaking time
It can also be any value between 3h, 4h, 6h, 8h, 10h and 3h~10h in addition to 5h；Third time cooling process (is cooled to room
Temperature) in, cooling rate can also be in addition to 30 DEG C/min 10 DEG C/min, 20 DEG C/min40 DEG C/min, 60 DEG C/min, 80 DEG C/
Any value between min, 100 DEG C/min and 10 DEG C/min~100 DEG C/min, cooling rate preferably 10 in the present embodiment
DEG C/min~50 DEG C/min between.
In other embodiment of the invention, when the material of central spindle is heat-resisting material, the material of central spindle is removed can
Other heat-resisting materials such as superalloy, tungsten alloy or molybdenum alloy etc. can also be used using high temperature ceramic material outside, or use table
Face is plated with the Conventional alloys central spindle of high-temperature-resistant layer, and the method for plating can be magnetron sputtering, CVD or ion plating, high temperature resistant
The tolerable temperature of layer is 30 DEG C higher than the sintering temperature of magnet ring, and high-temperature-resistant layer specifically can be TiN layer, TiC layer or ZrO2Layer.
In other embodiment of the invention, when dent is arranged on magnet ring surface, score specifically can be, it can also
To be the vortex situation that is generated when the quantity and specific size of dent are according to the operation of motor using the dent of other way setting
Depending on, the quantity of dent can also be any value between 2,10,15,20 and 2~20, the width of dent
It can also be any value between 0.1mm, 2mm, 3mm, 4mm, 5mm and 0.1mm~5mm, dent depth can also be radial
Any value between 1/4,2/4,3/4 and the 1/4~3/4 of thickness.
The dimensions of rotor assembly middle magnetic ring obtained and central spindle is all the same in the embodiment of the present invention and comparative example.
Finished product obtained in the embodiment of the present invention 1~9 and comparative example 1 is tested for the property, test result such as 1 institute of table
Show, wherein the test method of " binding force between magnet ring and central spindle " are as follows: tested with universal testing machine, seaming chuck is withstood
Central spindle, push-down head withstand magnet ring, opposite to apply pressure, are separated into terminal with magnet ring fragmentation or magnet ring and central spindle, the maximum measured
Power is binding force between the two；Other performance establishing criteria methods are tested.
Table 1: end properties obtained in the embodiment of the present invention and comparative example
By in the embodiment of the present invention 1~4 in finished product the original tensile strength of the tensile strength of central spindle and central spindle comparison it is found that
Central spindle after Overheating Treatment tensile strength can decline to a great extent, therefore when rotor quality is larger or motor speed is higher, with magnetic
Ring is assembled together, and common central spindle after being heat-treated is unsuitable to be used as central spindle, is needed to use instead high-intensitive magnetic conduction at this time and is closed
Jin Gang is as central spindle.
Embodiment 5 and the comparison of embodiment 2 be not it is found that when placing the alloy sheet of low melting point between central spindle and magnet ring, the two
Between binding force can be greatly reduced so that central spindle be easier take out.
Embodiment 6 and embodiment 5 comparison it is found that when central spindle using heat-resisting material prepare when, due to central spindle sintering and
It is mutually molten that atom diffusion will not occur in heat treatment process with magnet ring, so as to which the binding force between central spindle and magnet ring is greatly reduced,
So that central spindle is easy to take out.
Embodiment 7 and embodiment 5 comparison it is found that using faster cooling velocity will lead between magnet ring and central spindle generate compared with
Big internal stress, so that the binding force between magnet ring and central spindle is reduced, so that central spindle is easier to take out.
Embodiment 8 and the comparison of embodiment 2 are found, are divided into when multiple tracks dent is arranged on the magnet ring in rotor assembly
When muti-piece, rotor under the running at high speed of 40000r/min maximum temperature rise than reducing 23 DEG C when not set dent, it is seen that in magnetic
Dent is arranged on ring can significantly improve the service performance of rotor.
The preparation of magnet ring is carried out using the method in comparative example 1, it is 50%~60% that product qualified rate, which is counted, and this
Product qualified rate obtained can reach 95% or more in inventive embodiments 5 or 6, and product qualified rate obtained can in embodiment 7
Reach 91% or more, product qualification rate, which has, to be substantially improved.
In conclusion the present invention provides the permanent magnet rotor component of included central spindle (i.e. the complex of magnet ring and central spindle) and only
The preparation method of permanent magnet rotor component including magnet ring.For the permanent magnet rotor component of the included central spindle prepared in the present invention, only
Need to carry out overall processing, can remove from traditional permanent magnet rotor component preparation process the independent machining process of magnet and after
Continuous alinco assembled process, it is efficiently simple, suitable for the preparation of general rotor, it is also applied for the system of high speed rotor of motor
It is standby.For prepared by the present invention only including the permanent magnet rotor component of magnet ring, due to there is the support of central spindle in magnet ring preparation process,
The internal stress generated inside magnet ring can be substantially reduced, the cracking of magnet ring is prevented, so as to greatly improve yield rate, and then is dropped
Low preparation cost.
When preparing the permanent magnet rotor component of included central spindle using preparation method of the invention, should enhance as far as possible magnet ring with
Diffusion reaction between central spindle；When only including the permanent magnet rotor component of magnet ring using preparation method preparation of the invention, should use up
The diffusion reaction between magnet ring and central spindle may be weakened.
It can be selected to assemble or do not assemble non-magnetic according to design of electrical motor demand using rotor assembly prepared by the present invention
Alloy circle set.The differently- oriented directivity that magnetizes of permanent magnet is not limited to radial direction in the present invention, can be axis according to motor Demand Design
It is orientated to direction, oblique direction (being all a certain included angle with axial direction and radial direction), multipole, the directions such as radiation orientation.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (10)
1. a kind of preparation method of permanent magnet rotor component, which is characterized in that the preparation method includes the following steps:
S1, magnetic powder is prepared, the magnetic powder is made of permanent-magnet alloy；
S2, rotor assembly A is prepared, the rotor assembly A includes the magnet ring green compact outside centrally located central spindle and central spindle, described
Magnet ring green compact are made by magnetic powder compression moulding；
S3, rotor assembly A is subjected to integral sintered and bulk heat treatmet, the rotor assembly B of central spindle and magnet ring one is made；
S4, rotor assembly B is machined out to get permanent magnet rotor component finished product.
2. preparation method according to claim 1, which is characterized in that the permanent-magnet alloy is rare earth cobalt-based permanent magnetism material
Material or rare-earth iron-based permanent-magnetic material, the Rare-Earth Cobalt based permanent magnetic material are 1:5 type Rare-Earth Cobalt based permanent magnetic material or 2:17 type rare earth
Cobalt-based permanent-magnet material.
3. preparation method according to claim 1, which is characterized in that the preparation side of magnet ring green compact described in the step S2
Method is that magnetic powder is orientated to simultaneously compression moulding centered on central spindle under magnetic field around central spindle, and the magnet ring for being formed in central spindle periphery is raw
Base obtains permanent magnet rotor component A；
Or by magnetic powder, individually simultaneously compression moulding is hollow magnet ring green compact to orientation under magnetic field, then central spindle is assembled to magnet ring green compact
Hollow position, obtain permanent magnet rotor component A.
4. preparation method according to claim 3, which is characterized in that be previously provided with one between the central spindle and magnet ring green compact
Layer low-melting alloy piece, the material of the central spindle are permeability alloys steel.
5. the preparation method according to claim 4, which is characterized in that the permanent-magnet alloy is rare earth cobalt-based permanent magnetism material
When material, the low-melting alloy piece is copper sheet, and when the permanent-magnet alloy is rare-earth iron-based permanent-magnetic material, the low melting point is closed
Gold plaque is aluminium flake or copper sheet.
6. the preparation method according to claim 4, which is characterized in that the central spindle is hollow axial core.
7. preparation method according to claim 3, which is characterized in that the material of the central spindle is heat-resisting material, described
Heat-resisting material includes superalloy, molybdenum, tungsten, refractory ceramics；Or magnetron sputtering, CVD are first passed through in advance on the central spindle surface
Or the method for ion plating is formed with high-temperature-resistant layer.
8. preparation method according to claim 2, which is characterized in that the permanent-magnet alloy is 1:5 type rare earth cobalt-based
When permanent-magnet material, described in the step S3 it is integral sintered for by rotor assembly A be warming up to 1100 DEG C~1150 DEG C sintering 1h~
6h, the bulk heat treatmet are first to be cooled to sintered rotor assembly A with 0.1 DEG C/min~1 DEG C/min cooling rate
830 DEG C~900 DEG C heat preservation 0.5h~3h, then be cooled to room temperature with 10 DEG C/min~100 DEG C/min cooling rate；
When the permanent-magnet alloy is 2:17 type Rare-Earth Cobalt based permanent magnetic material, integral sintered described in the step S3 is that will turn
Sub-component A is warming up to 1180 DEG C~1250 DEG C sintering 1h~6h, the bulk heat treatmet be by sintered rotor assembly A first with
The cooling rate of 1 DEG C/min~4 DEG C/min be cooled to after 1100 DEG C~1200 DEG C heat preservation 1h~5h with 10 DEG C/min~100 DEG C/
The cooling rate of min is cooled to room temperature, then is warming up to 750 DEG C~860 DEG C heat preservation 5h~40h, then with 0.1 DEG C/min~2 DEG C/
The cooling rate slow cooling of min is cold with 10 DEG C/min~100 DEG C/min cooling rate later to 400 DEG C~500 DEG C heat preservation 1h~5h
But to room temperature；
When the permanent-magnet alloy is rare-earth iron-based permanent-magnetic material, integral sintered described in the step S3 is by rotor assembly
A is warming up to 1050 DEG C~1120 DEG C sintering 1h~6h, and the bulk heat treatmet is first with the cooling speed of 10 DEG C/min~100 DEG C/min
Degree is cooled to room temperature, then heats to heat preservation 2h~7h at 850 DEG C~950 DEG C, and with 10 DEG C/min~100 DEG C/min cooling
Speed is cooled to room temperature, then is warming up to 450 DEG C~600 DEG C heat preservation 3h~10h, and with 10 DEG C/min~100 DEG C/min cooling
Speed is cooled to room temperature.
9. preparation method according to claim 1, which is characterized in that machining described in the step S4 is included in described
Multiple tracks circumferential direction dent, indented portion resin or high-temp glue filling is arranged in magnet ring surface.
10. preparation method according to claim 1 or claim 7, which is characterized in that machining described in the step S4 includes will
Central spindle in rotor assembly B is taken out.
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| CN112564436A (en) * | 2020-11-26 | 2021-03-26 | 浙江英洛华磁业有限公司 | Method of manufacturing a rotor assembly |
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| CN105914968A (en) * | 2016-05-26 | 2016-08-31 | 珠海格力节能环保制冷技术研究中心有限公司 | Permanent magnet rotor forming method, permanent magnet rotor and electric machinery |
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| CN1315772A (en) * | 2000-03-24 | 2001-10-03 | 精工精密株式会社 | Rotor magnet, motor and step-by-step motor |
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