CN108414202B - A kind of high speed rotation shafting dynamic radial load stiffness test method and device - Google Patents
A kind of high speed rotation shafting dynamic radial load stiffness test method and device Download PDFInfo
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- CN108414202B CN108414202B CN201810191222.4A CN201810191222A CN108414202B CN 108414202 B CN108414202 B CN 108414202B CN 201810191222 A CN201810191222 A CN 201810191222A CN 108414202 B CN108414202 B CN 108414202B
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Abstract
The invention discloses a kind of high speed rotation shafting dynamic radial load stiffness test method and devices, method includes to electromagnetism winding output driving current, record the radial displacement of driving current and displacement sensor output, determine the radial displacement of live spindle, to the Radial magnetic force of live spindle application, the ratio between the radial displacement of Radial magnetic force, live spindle that calculating applies to live spindle is as the ratio between the Fourier transformation result of the first dynamic stiffness and/or aforementioned the two of calculating as the second dynamic stiffness；Device includes stator holder and rotor clamper, stator holder is equipped with two electromagnetism windings that accommodating hole, displacement sensor and relative rotor fixture are arranged symmetrically, rotor clamper is arranged in accommodating hole, the outer wall of rotor clamper is equipped with servo-motor silicon steel sheet rotor, and servo-motor silicon steel sheet rotor is arranged between two electromagnetism windings.The present invention has the advantages that measurement accuracy height, strong applicability, measurement is convenient, low energy consumption, is able to achieve regulated linear load.
Description
Technical field
The present invention relates to the dynamic stiffness measuring technologies of high-speed machine tool main shaft, high-speed electric main shaft and high-speed motor, and in particular to
A kind of high speed rotation shafting dynamic radial load stiffness test method and device, for completing high-speed electric main shaft and high-speed motor
Radial non-contact load and dynamic stiffness test.
Background technique
High-speed machine tool main shaft is the core functional components of modern machine, and effect is that band cutter (grinding wheel) or workpiece revolve
Turn, realizes high-speed & precise progressive die.With the continuous improvement that modern industry requires machine finish and processing efficiency, lathe pair
The requirement of main shaft performance is also higher and higher.Rigidity is to measure one of the important indicator of high-speed machine tool main shaft performance.Main axis stiffness packet
Include the Static stiffness under stationary state and dynamic stiffness when running at high speed.Stiffness excitations that are feasible in engineering at present and being widely adopted
Method is Static stiffness test method.But Static stiffness is under the conditions of can not really reflect that main shaft bears chip-load when running at high speed
The ability of resistance to deformation, only dynamic stiffness could the scientific dynamic bearer properties for reflecting main shaft.And the use in engineering at present
Dynamic stiffness test method is due to being difficult to promote the use of there are various limitations.
At present there is dynamic stiffness test method in engineering:
1, non-contact air-bearing loaded type measuring device, the advantage is that, contactless with main shaft, be conducive in high speed rotation
It is loaded under state.Its shortcoming is that: the rigidity of a. air-bearing is smaller, and loading force is limited；B. air bearing loaded type measuring device accounts for
It is also big with space, it is restricted by main shaft extension end space；C. it is difficult to remain air bearing state, the thickness of air film in loading procedure
Only micron dimension, in loading procedure, be easy because load biasing occur gas bearings and main shaft tested surface touch mill accident.
2, contactless liquid suspension loaded type measuring device, load capability is loaded higher than air bearing, but structure is complicated, is held
Liquid leakage easily occurs, is restricted by load space, only specific test main shaft is applicable in.
3, " belt-type " contact measurement device, its advantage is that it is easy to operate, to main shaft space without particular/special requirement.Its deficiency is
" belt " and main shaft direct friction generates heat serious and easy to wear, is not suitable for use when main shaft high speed.
4, it hangs weight and loads measuring device, i.e., be set with rolling bearing in axle stretch end, weight is hung on rolling bearing.This method
It is disadvantageous in that: (1) rigidity of vertical direction can only be measured；(2) when major axis size is larger, bearing size is big, vibrated
Limitation, is only suitable for using in the lower situation of the speed of mainshaft.
5, rolling bearing type loads measuring device, i.e., the outer circle of main shaft projecting end is directly acted on rolling bearing outer circle.
The disadvantage of this method is that: (1) load bearings with main shaft high speed rotation, noise big, and vibration is big, and load bearings are easy fever
And it damages；(2) bearing is that smooth normal direction contacts with main shaft outer circle, and the position for loading contact point is easy to happen offset, causes to test
As a result inaccurate.
6, unidirectional electromagnetism loaded type measuring device, disadvantage is that, (1) electromagnetic force and axle journal are displaced into nonlinear dependence
System, it is difficult to which accurate calibration, test result are easy to happen error；(2) when measured surface is non-magnetic, measurement method is not applicable；(3) axis
Holding with main shaft outer circle is that smooth normal direction contacts, and the position for loading contact point is easy to happen offset, causes test result inaccurate；
(4) when magnetic bearing stator and rotor surface are closer, since electromagnetic attraction increases sharply, it is easy to stick together, in master
In the state of axis high speed rotation, it is easy to frictional heating occur and burn even safety accident.
Summary of the invention
The technical problem to be solved in the present invention: in view of the above problems in the prior art, it is high, applicable to provide a kind of measurement accuracy
Property it is strong, measurement is convenient, low energy consumption, is able to achieve the high speed rotation shafting dynamic radial load stiffness test method of regulated linear load
And device.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
A kind of high speed rotation shafting dynamic radial load stiffness test method, implementation steps include:
1) installed in the live spindle of tested high speed rotation shafting in advance rotor, on stator holder installation for leading to
Cross rotor to live spindle apply Radial magnetic force two electromagnetism windings and at least one for detect live spindle radial direction
The displacement sensor of displacement, two electromagnetism winding relative rotors are arranged symmetrically；It is exported when testing to an electromagnetism winding
Driving current be i0+ix, to another electromagnetism winding export driving current be i0-ix, wherein i0For benchmark electric current, ixFor control
Electric current processed, records the radial displacement of change with time driving current and displacement sensor output, and jumps and perform the next step；
2) radial displacement of live spindle is determined according to the radial displacement that displacement sensor exports；
3) Radial magnetic force applied to live spindle is determined according to the radial displacement of driving current, live spindle；
4) ratio between the radial displacement of calculating applies to live spindle Radial magnetic force, live spindle is as test
Obtained the first dynamic stiffness output；And/or calculate the Fourier transformation result of the Radial magnetic force applied to live spindle, rotation
The second dynamic stiffness output that ratio between the Fourier transformation result of the radial displacement of main shaft is obtained as test.
Preferably, shown in the function expression such as formula (1) that the Radial magnetic force applied to live spindle is determined in step 3):
In formula (1), fxIt (t) is the Radial magnetic force applied to live spindle, kiElectric current ratio between two electromagnetism windings
Example coefficient, ksFor the displacement scale coefficient between two electromagnetism windings, ixTo control electric current, x is the radial displacement of live spindle, k
For the proportionality coefficient of electromagnetism winding, i0For benchmark electric current, s0For the benchmark event of live spindle, μ0For electromagnetism winding core material
Magnetic conductivity, N be electromagnetism winding coil turn, A be magnetic circuit cross-sectional area.
Preferably, the quantity of displacement sensor is two or more in step 1), is exported in step 2) according to displacement sensor
Radial displacement determine and specifically refer to be made even by the radial displacement that each displacement sensor exports when the radial displacement of live spindle
Mean value obtains.
A kind of test device for the aforementioned high speed rotation shafting dynamic radial load stiffness test method of the application present invention,
Including stator holder and rotor clamper, the stator holder is equipped with accommodating hole, displacement sensor and relative rotor folder
Have two electromagnetism windings being arranged symmetrically, the rotor clamper is arranged in accommodating hole, and the outer wall of the rotor clamper is equipped with
Servo-motor silicon steel sheet rotor, the servo-motor silicon steel sheet rotor are arranged between two electromagnetism windings.
Preferably, described two electromagnetism windings have public driving unit, and the driving unit includes add circuit, subtracts
Method circuit, the first amplifying circuit and the second amplifying circuit, the add circuit, subtraction circuit both an input terminal with for
Reference current is connected, another input terminal is connected with control electric current, and the output end of the add circuit passes through the first amplifying circuit
It is connected with an electromagnetism winding, the output end of the subtraction circuit is connected by the second amplifying circuit with another electromagnetism winding.
Preferably, interior magnetism-isolating loop is equipped with positioned at the inside of servo-motor silicon steel sheet rotor on the outer wall of the rotor clamper, be located at silicon steel
The outside of piece rotor is equipped with outer magnetism-isolating loop, and the servo-motor silicon steel sheet rotor is arranged between interior magnetism-isolating loop, outer magnetism-isolating loop.
Preferably, the stator holder is equipped with inner end cap and outer end cap, and the electromagnetism winding clamps respectively to be arranged in
Between inner end cap and outer end cap, and the interior magnetism-isolating loop and inner end cap is adjacent and gap is arranged, the outer magnetism-isolating loop and outer end cap
Adjacent and gap is arranged.
Preferably, the inner end of the stator holder is equipped with mounting base, and the stator holder is installed to by mounting base
On the high-speed motor flange of tested high speed rotation shafting.
Preferably, the rotor clamper is circular ring shape, and the outside of the rotor clamper is equipped with for locking rotor clamper
Rotor clamper is locked and is clamped to the high-speed motor rotation master of tested high speed rotation shafting by locking nut, the locking nut
On axis.
Preferably, two electromagnetism windings are arranged on same straight line up and down along the vertical direction.
High speed rotation shafting dynamic radial of the present invention load stiffness test method have it is following the utility model has the advantages that
1, the present invention installs rotor in the live spindle of tested high speed rotation shafting, installs on stator holder and be used for
By rotor to live spindle apply Radial magnetic force two electromagnetism windings and at least one for detecting live spindle diameter
To the displacement sensor of displacement, two electromagnetism winding relative rotors are arranged symmetrically, and rotor clamper is arranged in accommodating hole, rotor folder
The outer wall of tool is equipped with servo-motor silicon steel sheet rotor, and servo-motor silicon steel sheet rotor is arranged between two electromagnetism windings, exports to an electromagnetism winding
Driving current be i0+ix, to another electromagnetism winding export driving current be i0-ix, pass through two electromagnetism winding electricity of control
It is constant to flow summation, when the load of electromagnetism winding, trunnion offset, guarantees that the variable quantity of two electromagnetism winding currents is equal in magnitude,
According to the action principle of magnetic attraction, the comprehensive active force of two electromagnetism windings just keeps linearly closing with the increment of electric current
System, can so eliminate single side electromagnetism load bring it is non-linear, realize stable linear loading.
2, the present invention installed in the live spindle of tested high speed rotation shafting rotor, on flange installation for by turning
Son to live spindle apply Radial magnetic force two electromagnetism windings and at least one for detecting live spindle radial displacement
Displacement sensor, rotor clamper is arranged in accommodating hole, and the outer wall of rotor clamper is equipped with servo-motor silicon steel sheet rotor, servo-motor silicon steel sheet rotor
It is arranged between two electromagnetism windings, using the contactless load test form of this kind of stator and rotor, exists between the two
Gap, avoidable stator rotor touch mill safety accident.
3, high speed rotation shafting dynamic radial of the present invention loads stiffness test method low noise, and vibration is small, and test environment is good；
Controlled current flow, it is easy to accomplish automation is easy to implement the digitlization and automation of test；Fever is few, and energy consumption is very low, overcomes liquid
The high energy consumption of body gas bearing load.
High speed rotation shafting dynamic radial of the present invention load device for testing stiffness have it is following the utility model has the advantages that
1, the present invention includes stator holder and rotor clamper, and stator holder is equipped with accommodating hole, and accommodating hole is equipped with
Two electromagnetism windings that displacement sensor and relative rotor fixture are arranged symmetrically, rotor clamper are arranged in accommodating hole, rotor
The outer wall of fixture is equipped with servo-motor silicon steel sheet rotor, and servo-motor silicon steel sheet rotor is arranged between two electromagnetism windings, can be by controlling two electricity
Magnetic winding current summation is constant, when the load of electromagnetism winding, trunnion offset, guarantees that the variable quantity of two electromagnetism winding currents is big
Small equal, according to the action principle of magnetic attraction, the comprehensive active force of two electromagnetism windings is just kept with the increment of electric current into line
Sex ratio relationship, can so eliminate single side electromagnetism load bring it is non-linear, realize stable linear loading.
2, stator holder of the present invention is equipped with accommodating hole, and accommodating hole is equipped with displacement sensor and relative rotor fixture
Two electromagnetism windings being arranged symmetrically, displacement sensor and electromagnetism winding and stator assembly are an entirety, servo-motor silicon steel sheet rotor
It is corresponding with displacement sensor tested surface, electromagnetism winding load when, can measure simultaneously measured surface generation displacement with
Calculate dynamic stiffness.
3, stator holder of the present invention is equipped with accommodating hole, and displacement sensor and electromagnetism winding and stator holder are direct
Flange coupling with high-speed electric main shaft or high-speed motor is integrated, and rigidity is good, it is easy to accomplish load avoids individually designed test
The trouble of rack and fixed magnetic bearing stator module and thus bring error.
4, stator holder of the present invention is equipped with accommodating hole, and rotor clamper and servo-motor silicon steel sheet rotor can be made standardised series
The test original part of change is made into different standard components according to different electro spindles or motor overhanging end interface；Equally, stator is fixed
Seat, electromagnetism winding and displacement sensor may be alternatively configured the test component of standardised series, according to electro spindle or motor flange
Different structure is made into different standard components, is conducive to promote and apply, strong applicability.
5, the present invention installed in the live spindle of tested high speed rotation shafting rotor, on flange installation for by turning
Son to live spindle apply Radial magnetic force two electromagnetism windings and at least one for detecting live spindle radial displacement
Displacement sensor, rotor clamper is arranged in accommodating hole, and the outer wall of rotor clamper is equipped with servo-motor silicon steel sheet rotor, servo-motor silicon steel sheet rotor
It is arranged between two electromagnetism windings, using the contactless load test form of this kind of stator and rotor, exists between the two
Gap, avoidable stator rotor touch mill safety accident.
6, apparatus of the present invention low noise, vibration is small, and test environment is good；Controlled current flow, it is easy to accomplish automation is easy to implement
The digitlization and automation of test；Fever is few, and energy consumption is very low, overcomes the high energy consumption of liquefied gas bearing load.
Detailed description of the invention
Fig. 1 is the schematic cross-sectional view of the device of that embodiment of the invention.
Fig. 2 is the circuit theory schematic diagram of driving unit in the embodiment of the present invention.
Marginal data: 1, stator holder；10, accommodating hole；11, inner end cap；12, outer end cap；13, mounting base；2, rotor
Fixture；3, electromagnetism winding；31, add circuit；32, subtraction circuit；33, the first amplifying circuit；34, the second amplifying circuit；4, position
Displacement sensor；5, servo-motor silicon steel sheet rotor；6, interior magnetism-isolating loop；7, outer magnetism-isolating loop；8, locking nut.
Specific embodiment
Embodiment one:
The present embodiment high speed rotation shafting dynamic radial load stiffness test method implementation steps include:
1) installed in the live spindle of tested high speed rotation shafting in advance rotor, on stator holder installation for leading to
Cross rotor to live spindle apply Radial magnetic force two electromagnetism windings and at least one for detect live spindle radial direction
The displacement sensor of displacement, two electromagnetism winding relative rotors are arranged symmetrically；It is exported when testing to an electromagnetism winding
Driving current be i0+ix, to another electromagnetism winding export driving current be i0-ix, wherein i0For benchmark electric current, ixFor control
Electric current processed, records the radial displacement of change with time driving current and displacement sensor output, and jumps and perform the next step；
2) radial displacement of live spindle is determined according to the radial displacement that displacement sensor exports；
3) Radial magnetic force applied to live spindle is determined according to the radial displacement of driving current, live spindle；
4) ratio between the radial displacement of calculating applies to live spindle Radial magnetic force, live spindle is as test
Obtained the first dynamic stiffness output.
In the present embodiment, the function expression such as formula (1) of the Radial magnetic force applied to live spindle is determined in step 3)
It is shown:
In formula (1), fxIt (t) is the Radial magnetic force applied to live spindle, kiElectric current ratio between two electromagnetism windings
Example coefficient, ksFor the displacement scale coefficient between two electromagnetism windings, ixTo control electric current, x is the radial displacement of live spindle, k
For the proportionality coefficient of electromagnetism winding, i0For benchmark electric current, s0For the benchmark event of live spindle.
For single electromagnetism winding, shown in the expression formula such as formula (1-1) of the magnetic attraction generated；
In formula (1-1), FcFor the magnetic attraction that electromagnetism winding generates, μ0For the magnetic conductivity of electromagnetism winding core material, N is electricity
The coil turn of magnetic winding, A be magnetic circuit cross-sectional area, i be electromagnetism winding size of current, δ be electromagnetism winding magnetic pole with
The distance between rotor end-face, k are the proportionality coefficient of electromagnetism winding.From formula (1-1) as can be seen that the magnetic that electromagnetism winding generates
Power FcIt is square directly proportional to the size of current i's of electromagnetism winding, the distance between the magnetic pole of electromagnetism winding and rotor end-face δ's
It square is inversely proportional；Therefore, the magnetic attraction F that electromagnetism winding generatescWith the size of current i of electromagnetism winding, electromagnetism winding magnetic pole with
Nonlinear relationship is presented in the distance between rotor end-face δ, is unfavorable for the regulation and control of loaded load in operation.
In view of the above technical problems, installation is used to apply the two of Radial magnetic force to live spindle by rotor on flange in the present embodiment
A electromagnetism winding, two electromagnetism winding relative rotors are arranged symmetrically, and further using as shown in formula (1-2), mode realizes magnetic
Linearisation (the i.e. magnetic pole and rotor end-face of the size of current i of the plus load of magnetic attraction and electromagnetism winding, electromagnetism winding of suction
The distance between δ it is linearly proportional), so that determining the function table of Radial magnetic force applied to live spindle in step 3)
Up to shown in formula such as formula (1)；
In formula (1-2), f1(t) Radial magnetic force applied for an electromagnetism winding to live spindle, f2It (t) is another
The Radial magnetic force that electromagnetism winding applies to live spindle, each parameter connotation is identical as formula (1), and details are not described herein.
In the present embodiment, the quantity of displacement sensor is two in step 1), is exported in step 2) according to displacement sensor
Radial displacement determine and specifically refer to be made even by the radial displacement that each displacement sensor exports when the radial displacement of live spindle
Mean value obtains.
As shown in Figure 1, the test dress for Application Example high speed rotation shafting dynamic radial load stiffness test method
It sets including stator holder 1 and rotor clamper 2, stator holder 1 is equipped with accommodating hole 10, displacement sensor 4 and turns relatively
Two electromagnetism windings 3 that sub-folder tool 2 is arranged symmetrically, rotor clamper 2 are arranged in accommodating hole 10, set on the outer wall of rotor clamper 2
There is servo-motor silicon steel sheet rotor 5, servo-motor silicon steel sheet rotor 5 is arranged between two electromagnetism windings 3.In the present embodiment, 5 interference of servo-motor silicon steel sheet rotor connects
Female connector rotates on rotor clamper 2 with the high-speed motor live spindle of tested high speed rotation shafting (measurand)；It holds
By added radial load, the high-speed motor live spindle of tested high speed rotation shafting (measurand) is transferred load to；
Two displacement sensors 4 are set in the present embodiment altogether, the outside of each electromagnetism winding 3 is equipped with a displacement sensor 4, uses respectively
In top displacement and lower section displacement of the measurement rotor under the action of radial load.
In the present embodiment, two electromagnetism windings 3 have public driving unit, as shown in Fig. 2, driving unit includes addition
Circuit 31, subtraction circuit 32, the first amplifying circuit 33 and the second amplifying circuit 34, both add circuit 31, subtraction circuit 32
Uniform a input terminal is connected with for benchmark electric current, another input terminal is connected with control electric current, and the output end of add circuit 31 is logical
It crosses the first amplifying circuit 33 to be connected with an electromagnetism winding 3, the output end of subtraction circuit 32 is by the second amplifying circuit 34 and separately
One electromagnetism winding 3 is connected.
In the present embodiment, interior magnetism-isolating loop 6 is equipped with positioned at the inside of servo-motor silicon steel sheet rotor 5 on the outer wall of rotor clamper 2, is located at silicon
The outside of steel disc rotor 5 is equipped with outer magnetism-isolating loop 7, and servo-motor silicon steel sheet rotor 5 is arranged between interior magnetism-isolating loop 6, outer magnetism-isolating loop 7.It is interior every magnetic
6 interference connector sleeve of ring rotates on rotor clamper 2 with high-speed motor live spindle；Added radial load is born, will be carried
Lotus passes to high-speed motor live spindle；Outer 7 interference connector sleeve of magnetism-isolating loop is on rotor clamper 2, with high-speed motor live spindle
It rotates together；Added radial load is born, high-speed motor live spindle is transferred load to.
In the present embodiment, stator holder 1 is equipped with inner end cap 11 and outer end cap 12, and electromagnetism winding 3 clamps arrangement respectively
Between inner end cap 11 and outer end cap 12, and interior magnetism-isolating loop 6 and inner end cap 11 is adjacent and gap is arranged, outer magnetism-isolating loop 7 and outer end
Lid 12 is adjacent and gap is arranged.Inner end cap 11 and stator holder 1 are connected as an entirety, while as upper displacement sensor
Support construction；Support construction of the stator holder 1 as upper and lower two electromagnetism windings 3, at the same with tested high speed rotation shafting
The flange of (measurand) is connected as an entirety by bolt etc..
In the present embodiment, the inner end of stator holder 1 is equipped with mounting base 13, and stator holder 1 is installed by mounting base 13
Onto the high-speed motor flange of tested high speed rotation shafting (measurand).Tested high speed rotation shafting (measurand)
Connected support structure of the high-speed motor flange as stator holder 1 is considered as fixed structure in the course of work；Electromagnetism around
When group 3 is powered to the generation magnetic attraction load of rotor clamper 2, it is (tested that electromagnetism winding 3 can react on tested high speed rotation shafting
Object) flange.
In the present embodiment, rotor clamper 2 is circular ring shape, and the outside of rotor clamper 2 is equipped with the lock for locking rotor clamper 2
Rotor clamper 2 is locked and is clamped to the high speed electricity of tested high speed rotation shafting (measurand) by tight nut 8, locking nut 8
In machine live spindle, form an entirety.For tested high speed rotation shafting (measurand), high-speed motor rotation master
High speed rotation when axis works, is subject to the part of loaded load, and radial displacement is also the parameter tested by sensor.Rotor folder
Tool 2 is clamped in high-speed motor live spindle and with high-speed motor live spindle high speed rotation, bears added load,
Transfer load to high-speed motor live spindle；Since it is connected as one with high-speed motor live spindle, displacement sensor is surveyed
Its radial displacement of examination namely the radial displacement of high-speed motor live spindle.
In the present embodiment, two electromagnetism windings 3 are arranged on same straight line up and down along the vertical direction, referring to fig. 2, this reality
It applies and is respectively labeled as winding 3#2, f under electromagnetically winding 3#1 and electromagnetism in examplexFor the Radial magnetic force applied to live spindle, x
For the radial displacement of live spindle.Electromagnetically after winding 3#1 galvanization, electric current induction generates magnetic field, generates to servo-motor silicon steel sheet rotor 5
The size of upward magnetic attraction, electric current changes, and magnetic attraction can accordingly change；Under electromagnetism after winding 3#2 galvanization, electric current induction is produced
Magnetisation field generates downward magnetic attraction to servo-motor silicon steel sheet rotor 5；The size of electric current changes, and magnetic attraction can accordingly change.
Embodiment two:
The present embodiment is basically the same as the first embodiment, and main distinction point is only to calculate to apply to live spindle in step 4)
Ratio between the Fourier transformation result of the radial displacement of the Fourier transformation result, live spindle of the Radial magnetic force added is made
To test the second obtained dynamic stiffness output.Shown in the function expression such as formula (2) for calculating the second dynamic stiffness:
In formula (2), K (ω) is the second dynamic stiffness (amount varying with frequency), and F (ω) is the radial direction applied to live spindle
The Fourier transformation of magnetic attraction f (t) is as a result, X (ω) is the Fourier transformation of the radial displacement x (t) of live spindle as a result, f (t)
For the Radial magnetic force applied to live spindle, x (t) is the radial displacement of live spindle, and t is the time.
Embodiment three:
The present embodiment is basically the same as the first embodiment, and main distinction point is not only to calculate to apply to live spindle in step 1)
The first dynamic stiffness output that ratio between the radial displacement of the Radial magnetic force, live spindle that add is obtained as test, simultaneously
The Fourier for also calculating the radial displacement of the Fourier transformation result, live spindle of the Radial magnetic force applied to live spindle becomes
The second dynamic stiffness output that the ratio changed between result is obtained as test, for details, reference can be made to embodiments for the calculating of the second dynamic stiffness
Two.
Example IV:
The present embodiment is basically the same as the first embodiment, and main distinction point is that the quantity of displacement sensor in step 1) is single
It is a, thus in step 2) according to displacement sensor export radial displacement determine the radial displacement of live spindle when, displacement sensing
The radial displacement of device output is the radial displacement of live spindle.In addition it is also possible to which the substantially increase in embodiment one is more
The displacement sensor of (> 2) determines the radial displacement of live spindle in step 2) according to the radial displacement of displacement sensor output
When, it can also equally use and be averaged to obtain the radial position of live spindle by the radial displacement that each displacement sensor exports
It moves.
Although the present invention has been disclosed as a preferred embodiment, however, it is not intended to limit the invention.It is any to be familiar with ability
The technical staff in domain, without deviating from the scope of the technical scheme of the present invention, all using the technology contents pair of the disclosure above
Technical solution of the present invention makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, all
Without departing from the content of technical solution of the present invention, according to the present invention technical spirit any simple modification made to the above embodiment,
Equivalent variations and modification, all shall fall within the protection scope of the technical scheme of the invention.
Claims (10)
1. a kind of high speed rotation shafting dynamic radial loads stiffness test method, it is characterised in that implementation steps include:
1) installed in the live spindle of tested high speed rotation shafting in advance rotor, on stator holder installation for by turning
Son to live spindle apply Radial magnetic force two electromagnetism windings and at least one for detecting live spindle radial displacement
Displacement sensor, two electromagnetism winding relative rotors are arranged symmetrically；The drive exported when testing to an electromagnetism winding
Streaming current is i0+ix, to another electromagnetism winding export driving current be i0-ix, wherein i0For benchmark electric current, ixFor control electricity
Stream, records the radial displacement of change with time driving current and displacement sensor output, and jumps and perform the next step；
2) radial displacement of live spindle is determined according to the radial displacement that displacement sensor exports；
3) Radial magnetic force applied to live spindle is determined according to the radial displacement of driving current, live spindle；
4) ratio between the radial displacement of calculating applies to live spindle Radial magnetic force, live spindle is obtained as test
The first dynamic stiffness output；And/or calculate Fourier transformation result, the live spindle of the Radial magnetic force applied to live spindle
Radial displacement Fourier transformation result between ratio as test obtain the second dynamic stiffness output.
2. high speed rotation shafting dynamic radial according to claim 1 loads stiffness test method, which is characterized in that step
3) shown in the function expression such as formula (1) for determining the Radial magnetic force applied to live spindle in:
In formula (1), fxIt (t) is the Radial magnetic force applied to live spindle, kiFor the current ratio system between two electromagnetism windings
Number, ksFor the displacement scale coefficient between two electromagnetism windings, ixTo control electric current, x is the radial displacement of live spindle, and k is electricity
The proportionality coefficient of magnetic winding, i0For benchmark electric current, s0For the benchmark event of live spindle, μ0For the magnetic of electromagnetism winding core material
Conductance, N are the coil turn of electromagnetism winding, and A is the cross-sectional area of magnetic circuit.
3. high speed rotation shafting dynamic radial according to claim 1 loads stiffness test method, which is characterized in that step
1) quantity of displacement sensor is two or more in, is determined in step 2) according to the radial displacement of displacement sensor output and rotates master
It specifically refers to be averaged to obtain by the radial displacement that each displacement sensor exports when the radial displacement of axis.
4. a kind of load stiffness test method for any one of application claims 1 to 3 high speed rotation shafting dynamic radial
Test device, it is characterised in that: including stator holder (1) and rotor clamper (2), the stator holder (1), which is equipped with, holds
Set two electromagnetism windings (3) that hole (10), displacement sensor (4) and relative rotor fixture (2) are arranged symmetrically, the rotor folder
Tool (2) is arranged in accommodating hole (10), and the outer wall of the rotor clamper (2) is equipped with servo-motor silicon steel sheet rotor (5), and the silicon steel sheet turns
Sub (5) are arranged between two electromagnetism windings (3).
5. test device according to claim 4, it is characterised in that: described two electromagnetism windings (3) have public drive
Moving cell, the driving unit include add circuit (31), subtraction circuit (32), the first amplifying circuit (33) and the second amplification
Circuit (34), the add circuit (31), subtraction circuit (32) both an input terminal and i0It is connected for benchmark electric current, is another
A input terminal and control electric current ixIt is connected, the output end of the add circuit (31) passes through the first amplifying circuit (33) and an electricity
Magnetic winding (3) is connected, and the output end of the subtraction circuit (32) passes through the second amplifying circuit (34) and another electromagnetism winding (3)
It is connected.
6. test device according to claim 5, it is characterised in that: be located at silicon steel on the outer wall of the rotor clamper (2)
The inside of piece rotor (5) is equipped with interior magnetism-isolating loop (6), is located at the outside of servo-motor silicon steel sheet rotor (5) equipped with outer magnetism-isolating loop (7), the silicon
Steel disc rotor (5) is arranged between interior magnetism-isolating loop (6), outer magnetism-isolating loop (7).
7. test device according to claim 6, it is characterised in that: the stator holder (1) is equipped with inner end cap
(11) and outer end cap (12), the electromagnetism winding (3) clamps be arranged between inner end cap (11) and outer end cap (12) respectively, and institute
It states interior magnetism-isolating loop (6) and inner end cap (11) is adjacent and gap is arranged, the outer magnetism-isolating loop (7) and outer end cap (12) is adjacent and gap
Arrangement.
8. test device according to claim 4, it is characterised in that: the inner end of the stator holder (1) is equipped with installation
Seat (13), the stator holder (1) are installed to the high-speed motor flange of tested high speed rotation shafting by mounting base (13)
On.
9. test device according to claim 4, it is characterised in that: the rotor clamper (2) is circular ring shape, the rotor
The outside of fixture (2) is equipped with locking nut (8) for locking rotor clamper (2), and the locking nut (8) is by rotor clamper
(2) it locks and is clamped in the high-speed motor live spindle of tested high speed rotation shafting.
10. test device according to claim 4, it is characterised in that: two electromagnetism windings (3) along the vertical direction up and down cloth
It is placed on same straight line.
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| CN201810191222.4A CN108414202B (en) | 2018-03-08 | 2018-03-08 | A kind of high speed rotation shafting dynamic radial load stiffness test method and device |
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| CN201810191222.4A CN108414202B (en) | 2018-03-08 | 2018-03-08 | A kind of high speed rotation shafting dynamic radial load stiffness test method and device |
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| CN109765016B (en) * | 2018-12-19 | 2021-08-20 | 广州市昊志机电股份有限公司 | Method and device for testing axial dynamic stiffness of main shaft |
| CN109765015B (en) * | 2018-12-19 | 2021-09-21 | 广州市昊志机电股份有限公司 | Method and device for testing radial dynamic stiffness of main shaft |
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| JP3383537B2 (en) * | 1996-12-18 | 2003-03-04 | 日立粉末冶金株式会社 | Testing machine for bearings |
| CN102109416B (en) * | 2010-12-15 | 2012-03-07 | 西安理工大学 | Non-contact electromagnetic loading device for high speed electric spindle |
| CN102252842A (en) * | 2011-04-28 | 2011-11-23 | 湖南大学 | Method and device for testing dynamic stiffness of high-speed main shaft |
| CN103278320A (en) * | 2013-05-31 | 2013-09-04 | 清华大学 | Non-contact detecting system of running dynamic stiffness of machine tool spindle |
| CN103868683A (en) * | 2014-01-03 | 2014-06-18 | 重庆大学 | Motorized spindle rigidity test device |
| CN104807629B (en) * | 2015-05-08 | 2017-11-17 | 武汉理工大学 | A kind of shafting electromagnetic hydraulic pressure comprehensive simulation test loading device |
| CN106679959A (en) * | 2017-01-09 | 2017-05-17 | 清华大学深圳研究生院 | Bending composite loader, testing device and system for main shaft of machine tool |
| CN106885663B (en) * | 2017-02-21 | 2019-11-08 | 清华大学深圳研究生院 | A kind of machine tool chief axis stiffness test method and its system |
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