CN101494410B - Inspection device for air gap off-centering of monocyclic-start induction motor and air gap correcting method - Google Patents
Inspection device for air gap off-centering of monocyclic-start induction motor and air gap correcting method Download PDFInfo
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Abstract
The invention provides an air-gap eccentricity detector of a single-phase induction motor and an air-gap correction method, which is unnecessary to arrange a noise removal unit such as a noise filter, even if deviation and interference of each single-phase induction motor is existed, and can accurately detect the eccentricity of an air gap. The air-gap eccentricity detector comprises a galvanometer (121a, 121b) for measuring current waveform of the current flowing into a main winding (110) and an auxiliary winding (111), and a deceleration picker (122a, 122b) for measuring the vibration waveform of the vibration of the single-phase induction motor on the direction of which the unbalanced magnetic attractive force generated in a rotator is the maximum, when applying AC voltage on the main winding (110) and the auxiliary winding (111), calculating the eccentric amount of the air gap (101) by utilizing the amplitude of the measured vibration waveform, and calculating the eccentric direction by utilizing the time change of the phase difference between the measured vibration waveform and the current waveform, and determining whether the air gap (101) is good or not according to the calculated eccentric amount and the eccentric direction.
Description
Technical field
The present invention relates to air gap (air gap) eccentric inspection apparatus and the air gap modification method of monocyclic-start induction motor.
Background technology
In the past, there was pair monocyclic-start induction motor to switch on and measured the vibration that takes place down at the non-rotary restriction state of rotor (also being called lock-out state), inferred the method for eccentric state of the air gap of monocyclic-start induction motor thus.For example a certain side of the main winding of monocyclic-start induction motor or auxiliary winding is applied than the low voltage of rated voltage and be set as lock-out state, according to the state in the gap of the waveform of the voltage that is applied and vibrational waveform detection rotor that under lock-out state, takes place and stator.
If main winding or auxiliary winding are applied voltage, then flow through electric current and magnetic flux takes place, magnetic attraction acts on rotor.Magnetic attraction also becomes maximum when magnetic flux becomes maximum, and rotor moves to the narrow side of air gap.For example postpone than voltage waveform under the situation of 1/4 wavelength at flux waveforms, vibrational waveform is got maximum value or minimum value when voltage waveform becomes zero, and from the consistent eccentric direction that can judge air gap with the air gap eccentric centre direction of its symbol.Can utilize the size of the amplitude of vibrational waveform to infer the size of air gap eccentric centre state in addition, detect the eccentric direction and the eccentric size (with reference to patent documentation 1) of air gap thus.
In addition, motor is switched on, and according to amount and the direction of judging the air gap eccentric centre of rotor at the vibrational waveform that beginning to take place under the lock-out state before rotating in when starting.Because the symbol of the rising edge of the vibrational waveform that takes place under lock-out state is consistent with the eccentric direction of air gap, so judge the eccentric direction of air gap according to the symbol of the rising edge of vibrational waveform.Can infer the size of the off-centre of air gap in addition according to the maximum of the amplitude of vibrational waveform, detect the eccentric direction and the eccentric size (with reference to patent documentation 2) of air gap thus.
Patent documentation 1: Japanese kokai publication sho 60-152262 communique (the 1st page of the 4th～11 row, the 2nd page of the 32nd row～the 56 capable, Fig. 8)
Patent documentation 2: Japanese kokai publication hei 06-284655 communique (the 2nd page of the 2nd～11 row, the 2nd page of the 70th～76 row, the 4th page of the 1st～the 93rd row, Fig. 6)
Summary of the invention
The inspection device for air gap off-centering of monocyclic-start induction motor in the past constitutes as described above, in above-mentioned patent documentation 1, under the situation of the eccentric direction of judging air gap according to voltage waveform that motor is applied and measured vibrational waveform, skew (in above-mentioned example, being offset 1/4 wavelength) when the phase place of phase place that detects voltage waveform and vibrational waveform, and when judging the eccentric direction of air gap according to the symbol of the extreme value of vibrational waveform, in the product of reality, in the phase deviation of the voltage waveform of each motor and vibrational waveform, there is deviation, and in the current waveform and vibrational waveform measured at motor, therefore also in phase deviation, produce deviation at each current cycle, exist in the judgement of eccentric direction of air gap to produce the such problem points of error.
In addition in above-mentioned patent documentation 2, under the situation of the eccentric direction of judging air gap according to the rising edge of measured vibrational waveform, owing to sneaking into the point that noise is difficult to judge the rising of vibrational waveform, select frequency even use band pass filter to wait, when setting is used to judge the parameter of eccentric direction of air gap, also need bigger workload, be difficult to set for the such problem points of eccentric direction that can judge air gap at each different machine so exist.
In the product of reality, according to the machining accuracy and the assembly precision of parts, the eccentric state of air gap changes along with main axis rotation sometimes.For example the centre of rotor axle of being fixed by hot jacket as the main shaft of pivot relatively sometimes produces eccentric or main shaft bending, and the phase place of rotor changes along with main axis rotation under these circumstances, thereby the eccentric state of air gap also changes.
Under these circumstances, if pass through measuring vibrations under the non-rotary lock-out state of rotor as prior art, and infer the offset and the eccentric direction of air gap, then owing to do not consider the air gap eccentric centre state variation that the phase place by rotor causes, so in whether air gap is well judged, produce error sometimes.
The present invention finishes in order to solve problem points as described above, its purpose is to provide a kind of inspection device for air gap off-centering and air gap modification method of monocyclic-start induction motor, can measure the eccentric state (offset and direction) of air gap accurately, can utilize resulting result of measurement of eccentricity simultaneously and judge reliably whether air gap is good, and then revise air gap according to the data of air gap eccentric centre state.
The inspection device for air gap off-centering of monocyclic-start induction motor of the present invention, the off-centre of the air gap of monocyclic-start induction motor is checked that this monocyclic-start induction motor comprises: rotor, rotate with main shaft; And stator, be configured to possess main winding and auxiliary winding and and rotor between have air gap, wherein, this inspection device for air gap off-centering is provided with: the unit that main winding and auxiliary winding is applied alternating voltage; Current measuring unit, the current waveform of the electric current of main winding and auxiliary winding is flow through in measurement; The vibrational waveform of vibration that the uneven magnetic attraction that takes place becomes the monocyclic-start induction motor of maximum direction when main winding and auxiliary winding have been applied alternating voltage, is measured in the vibration measurement unit in rotor; And the magnitude determinations of utilizing vibrational waveform goes out the offset of air gap, and the time of utilizing the phase difference of vibrational waveform and current waveform changes the eccentric direction that calculates air gap, judges the unit that air gap is whether good according to the offset of the air gap that is calculated and eccentric direction.
The air gap modification method of monocyclic-start induction motor of the present invention, this monocyclic-start induction motor comprises: rotor, rotate with main shaft; And stator, be configured to possess main winding and auxiliary winding and and rotor between have air gap, wherein, this air gap modification method is characterised in that, main winding and auxiliary winding are applied alternating voltage, the current waveform of the electric current of main winding and auxiliary winding is flow through in measurement, and when main winding and auxiliary winding have been applied alternating voltage, the uneven magnetic attraction that measurement takes place in rotor becomes the vibrational waveform of vibration of the monocyclic-start induction motor of maximum direction, utilize the magnitude determinations of measured vibrational waveform to go out the offset of air gap, and the time of utilizing the phase difference of vibrational waveform and current waveform changes the eccentric direction that calculates air gap, offset and eccentric direction according to the air gap that is calculated judge whether air gap is good, make the housing distortion that is fixed with stator according to this result of determination, thereby revise the off-centre of air gap.
According to the inspection device for air gap off-centering of monocyclic-start induction motor of the present invention, the off-centre of the air gap of monocyclic-start induction motor is checked that this monocyclic-start induction motor comprises: rotor, rotate with main shaft; And stator, be configured to possess main winding and auxiliary winding and and rotor between have air gap, wherein, this inspection device for air gap off-centering comprises: current measuring unit, measure the current waveform of the electric current flow through main winding and auxiliary winding; The vibrational waveform of vibration that the uneven magnetic attraction that takes place becomes the monocyclic-start induction motor of maximum direction when main winding and auxiliary winding have been applied alternating voltage, is measured in the vibration measurement unit in rotor; And the magnitude determinations of utilizing the vibrational waveform of being measured by the vibration measurement unit goes out the offset of air gap, and the time of utilizing the phase difference of vibrational waveform and current waveform changes the eccentric direction that calculates air gap, judge the unit that air gap is whether good according to the offset of the air gap that is calculated and eccentric direction, so can not be subjected to the deviation of each monocyclic-start induction motor and the influence of interference, and can correctly judge air gap eccentric centre direction and offset.
According to the air gap modification method of monocyclic-start induction motor of the present invention, this monocyclic-start induction motor comprises: rotor, rotate with main shaft; And stator, be configured to possess main winding and auxiliary winding and and rotor between have air gap, wherein, this air gap modification method is characterised in that, main winding and auxiliary winding are applied alternating voltage, the current waveform of the electric current of main winding and auxiliary winding is flow through in measurement, and when main winding and auxiliary winding have been applied alternating voltage, the uneven magnetic attraction that measurement takes place in rotor becomes the vibrational waveform of vibration of the monocyclic-start induction motor of maximum direction, utilize the magnitude determinations of vibrational waveform to go out the offset of air gap, and the time of utilizing the phase difference of vibrational waveform and current waveform changes the eccentric direction that calculates air gap, offset and eccentric direction according to the air gap that is calculated judge whether air gap is good, make the housing distortion that is fixed with stator according to this result of determination, thereby revise the off-centre of air gap, so can be easily and correctly revise the off-centre of air gap.
Description of drawings
Fig. 1 is the longitudinal sectional drawing that is illustrated in the rotary compressor 100 that freezing air conditioner that inside has the monocyclic-start induction motor of embodiments of the present invention 1 uses.
Fig. 2 is the A-A line transverse cross-sectional view among Fig. 1.
Fig. 3 illustrates the profile of inspection device for air gap off-centering that the rotary compressor 100 that the freezing air conditioner of built-in monocyclic-start induction motor is used is made as the monocyclic-start induction motor of measured body.
Fig. 4 is the B-B line transverse cross-sectional view among Fig. 3.
Fig. 5 is the flow chart that the air gap inspection method is shown.
Fig. 6 is the circuit diagram that the drive circuit in the inspection device for air gap off-centering is shown.
Fig. 7 is the flow chart that the air gap inspection method is shown.
Fig. 8 is the curve chart that the example of measured current waveform and vibrational waveform is shown.
Fig. 9 is the curve chart that amplifies the electric current half-wavelength part that illustrates among Fig. 8.
Figure 10 is the curve chart of distribution that the quantity of the poor and extreme value that is offset of the shift time of extreme value of current waveform and vibrational waveform is shown.
Figure 11 is the flow chart that the air gap inspection method is shown.
Figure 12 is the circuit diagram that the drive circuit in the inspection device for air gap off-centering is shown.
Figure 13 is the flow chart that the air gap inspection method is shown.
Figure 14 is the curve chart that the exemplary of current waveform and vibrational waveform is shown.
Figure 15 is the circuit diagram that the drive circuit in the inspection device for air gap off-centering of embodiment of the present invention 2 is shown.
Figure 16 is the circuit diagram that the drive circuit in the inspection device for air gap off-centering of embodiment of the present invention 2 is shown.
Figure 17 is the circuit diagram that the drive circuit in the inspection device for air gap off-centering of embodiment of the present invention 3 is shown.
Figure 18 is the circuit diagram that the drive circuit in the inspection device for air gap off-centering of embodiment of the present invention 3 is shown.
Figure 19 is the circuit diagram that the drive circuit in the inspection device for air gap off-centering of embodiment of the present invention 4 is shown.
Figure 20 is the circuit diagram that the drive circuit in the inspection device for air gap off-centering of embodiment of the present invention 4 is shown.
Figure 21 is the profile that the uv coordinate system of the air gap eccentric centre state that is used for representing two-dimensionally embodiment of the present invention 5 is shown.
Figure 22 is the profile that the method that is used to revise the air gap eccentric centre state is shown.
Label declaration
101 air gaps
102 rotors
103 stators
104 housings
105 main shafts
110 main windings
111 auxiliary windings
121a, 121b galvanometer
122a, 122b acceleration pick-up
134 voltage adjusters
153 frequency adjusters
Embodiment
Below with reference to the accompanying drawings an embodiment of the invention are described.Fig. 1 is the longitudinal sectional drawing that is illustrated in the rotary compressor 100 that freezing air conditioner that inside has monocyclic-start induction motor uses.Fig. 2 is the A-A line transverse cross-sectional view among Fig. 1.Monocyclic-start induction motor mainly is made of rotor 102 and stator 103.Between rotor 102 and stator 103, there is air gap 101 as space cylindraceous.
The winding of stator 103 is made of 2 kinds of windings that are called as main winding 110 and auxiliary winding 111.From the AC power (not shown) that is arranged on the compressor outside via being fixedly welded on terminal 112 on the housing 104 to stator 103 supply capabilities.On housing 104, be fixed with the discharge pipe 113 of the gas that discharge to compress as the muffler (muffler) 114 of the suction inlet of the gas before the compression and to the outside by soldering, if the gas before the compression is inhaled into from muffler 114, then in cylinder 108, be compressed, and after being spued in the housing 104 from support 106, spued outside the rotary compressor 100 by discharge pipe 113.
Fig. 3 illustrates the profile of inspection device for air gap off-centering that the rotary compressor 100 that the freezing air conditioner of built-in monocyclic-start induction motor is used is made as the monocyclic-start induction motor of measured body.Fig. 4 is the B-B line transverse cross-sectional view among Fig. 3.
By splicing ear 120 being connected to the terminal 112 of rotary compressor 100, can apply alternating voltage from the monocyclic-start induction motor of AC power (not shown) in rotary compressor 100.Galvanometer 121a is installed on the lead that main winding 110 is switched on, on the lead that auxiliary winding 111 is switched on, galvanometer 121b is installed simultaneously.
Use acceleration pick- up 122a, 122b to measure the vibration that when monocyclic-start induction motor is switched on, takes place.As shown in Figure 4, measure the uneven magnetic attraction that has taken place being become the direction of maximum by acceleration pick-up 122a when main winding 110 has been switched on alternating voltage in rotor 102 (generally is the auxiliary residing direction of winding, so below record and narrate into auxiliary winding direction) the upward vibration of generation, measure the uneven magnetic attraction that when auxiliary winding 111 has been switched on alternating voltage, in rotor 102, has taken place by acceleration pick-up 122b and become the vibration that maximum direction (generally being the residing direction of main winding, so the following main winding direction of recording and narrating into) upward produces.
Acceleration pick- up 122a, 122b can be respectively move along the radial direction of rotary compressor 100 by acceleration pick-up cylinder 123, when vibration measurement, remove the material 124 that shakes and be pressed against rotary compressor 100, and measure the vibration of the housing 104 that to rotary compressor 100 energisings the time, produces via pick-up.Pass through to clamp claw 125 fixing rotary compressors 100 at degree of will speed up pick-up 122a, when 122b is pressed into rotary compressor 100, so that rotary compressor 100 is not done lateral rotation.
Clamp claw 125 and remove the thrust that the material 126 that shakes passes through clamping cylinder 127 via clamping, can be from horizontal maintenance rotary compressor 100.Rotary compressor 100 is configured in workpiece and removes on the material 128 that shakes.Below measuring unit substrate 129, dispose vibrationproof part 130, prevent to arrive measurement section from the vibration propagation of outside.
The signal of telecommunication by 131 pairs of measured vibrations of amplifier amplifies.The signal of telecommunication of the electric current of measuring by galvanometer 121a, 121b and be exaggerated after the signal of vibration be recorded in the computer 132 by A/D plate (not shown).Computer 132 calculates air gap eccentric centre direction and air gap offset according to current waveform that is write down and vibrational waveform, shows the result who is calculated by the display 133 of computer.
Can utilize voltage adjuster 134 to adjust the alternating voltage that main winding 110 and auxiliary winding 111 are applied.Promptly on base bearing, be coated with oil, and under the situation of main shaft 105 high speed rotating, the oil film reaction force takes place on base bearing sometimes, and error takes place in the vibration of measuring, but adjust the alternating voltage that main winding 110 and auxiliary winding 111 are applied by utilizing voltage adjuster 134, can make the rotating speed of rotor 102 become low speed, and prevent such error.Utilize resistor 135 and capacitor 136 to adjust the size of the alternating current that flows through monocyclic-start induction motor in addition.Above-mentioned electric equipment class is fixed on the pallet 137.
By AC power (not shown) via splicing ear 120 and terminal 112, apply alternating voltage to rotary compressor 100, utilize galvanometer 121a and galvanometer 121b measurement to flow through the electric current and the electric current that flows through auxiliary winding 111 of main winding 100 respectively, utilize acceleration pick-up 122a and acceleration pick-up 122b to measure the vibration that in rotary compressor 100, produces simultaneously.
The time that is calculated the phase difference of measured current waveform and vibrational waveform by computer 132 changes, the air gap eccentric direction is inferred out in time variation according to the phase difference that is calculated, and infers out the air gap offset according to the size of measured vibrational waveform.Measure respectively at auxiliary winding direction and main winding direction, judge about the air gap eccentric centre direction of auxiliary winding direction and air gap offset and about the air gap eccentric centre direction and the air gap offset of main winding direction whether the air gap eccentric centre state is good according to what infer from measurement result.
Next, the flow chart of use Fig. 5 describes the details of the inspection unit of air gap eccentric centre state.At first rotary compressor 100 being arranged at workpiece removes on the material 128 that shakes (step ST500).Next utilize clamping cylinder 127 that clamping claw 125 is advanced, and fixing rotary compressor 100 (step ST501).Next splicing ear 120 is connected to terminal 112 (step ST502).Next utilize acceleration pick-up cylinder 123 that acceleration pick-up 122a, 122b are advanced, and be pressed into rotary compressor 100 (step ST503).
Next switch driving circuit will be set as greater than by making electric current flow through the magnetic flux (step ST504) that auxiliary winding 111 takes place by making electric current flow through magnetic flux that main winding 110 takes place.Fig. 6 is the circuit diagram that the drive circuit in the inspection device for air gap off-centering is shown.Main winding switch 144 is connected to contact 143 sides (step ST504-1).
By assisting winding switch 145 to be connected to contact 146 sides, assist winding resistance device 148 and auxiliary winding electric container 149 (step ST504-2) then and assist winding 111 to be connected in series relatively.Adjust the electric current that flows through each winding flows through main winding 110 with increase electric current thus, and reduce to flow through the electric current of assisting winding 111, the size that will work as the magnetic flux that is taken place by main winding 110 when switching in air gap 101 is set as greater than the size by the magnetic flux of assisting winding 111 to take place.
Next utilize voltage adjuster 134 that the voltage of AC power 150 is adjusted to specific voltage (step ST504-3).Next monocyclic-start induction motor is applied alternating voltage, begin to measure the electric current that flows through main winding 110 and the vibration (step ST505) of auxiliary winding direction.Utilize galvanometer 121a measurement to flow through the current waveform of main winding 110.Utilize acceleration pick-up 122a to measure the vibrational waveform (step ST506) of auxiliary winding direction in addition.
If passed through the Measuring Time of regulation, then finish to measure, also finish energising (step ST507) simultaneously.Measured current waveform is read in and records computer 132 via A/D plate (not shown).Utilize 131 pairs of measured vibrational waveforms of amplifier to amplify in addition, read in and record computer 132 (step ST508) via A/D plate (not shown).
Flow through the current waveform of main winding 110 and the vibrational waveform of auxiliary winding direction by computer 132 utilizations, calculate the eccentric direction and the offset (step ST509) of the air gap of auxiliary winding direction.Fig. 7 is the flow chart that is used to illustrate these computational methods.Fig. 8 is the curve chart that the example of measured current waveform and vibrational waveform is shown.
The method that changes as time of the phase difference that calculates current waveform and vibrational waveform, in the flow process of Fig. 7, employing is calculated the moment poor that moment that current waveform becomes extreme value (peak or paddy) and vibrational waveform become maximum (peak) or minimum (paddy) at the half-wavelength of each current waveform, with the distribute method of the difference of representing moment of being calculated of frequency.Below be elaborated.The moment that current waveform is become extreme value is made as t
N-1, t
n, the moment that vibrational waveform is become maximum is made as t1
M-2～t1
M+2, vibrational waveform is become the minimizing moment is made as t2
M-2～t2
M+2Fig. 9 is the curve chart that amplifies the electric current half-wavelength part that illustrates among Fig. 8.Current waveform is become the moment t of extreme value
nBecome maximum t1 with vibrational waveform
m, t1
M+1The difference in the moment be made as p1
N, m, p1
N, m+1In addition current waveform is become the moment t of extreme value
nBecome minimizing t2 with vibrational waveform
m, t2
M+1The difference in the moment be made as p2
N, m, p2
N, m+1
In Fig. 7,, calculate the moment t that current waveform becomes extreme value (peak, paddy) at first according to the current waveform that flows through main winding 110
i(i=0,1 ..., n ...) (step ST600).Next according to the vibrational waveform of auxiliary winding direction, calculate the moment t1 that vibrational waveform becomes maximum (peak)
j(j=0,1 ..., m ...) (step ST601).Next according to flowing through the current waveform of main winding 110 and the vibrational waveform of auxiliary winding direction, at each current waveform half period, the difference p1 in the moment of the maximum of the vibration in calculating during the electric current half-wavelength and the extreme value of electric current
I, j=t1
j-t
i(step ST602).
Next according to flowing through the current waveform of main winding 110 and the vibrational waveform of auxiliary winding direction, at each time p calculating becoming p=p1
I, j(i, j=0,1 ...) and the number k1 (p) (step ST603) of maximum.Figure 10 is the curve of distribution that the quantity of the poor and extreme value that is offset of the shift time of extreme value of current waveform and vibrational waveform is shown.Transverse axis is the time p that is offset, and the longitudinal axis is the number k1 (p) or the minimizing number k2 described later (p) of the maximum corresponding with the time of this skew.
In Figure 10,, the particular range Δ p among the time p is calculated k1 (Δ p) sum h1=Σ k1 (Δ p) (step ST604) at the vibrational waveform of current waveform that flows through main winding 110 and auxiliary winding direction.Narrate concrete definite method in the back about specific range delta p.Next as shown in Figure 8, the waveform from the vibration of auxiliary winding direction calculates the moment t2 that vibrational waveform becomes minimum (paddy)
j(j=0,1 ..., m ...) (step ST605).Next according to flowing through the current waveform of main winding 110 and the vibrational waveform of auxiliary winding direction, at each current waveform half period, the difference p2 in the moment of the minimum of the vibration in calculating during the electric current half-wavelength and the extreme value of electric current
I, j=t2
j-t
i(step ST606).
Next, according to the vibrational waveform of current waveform that flows through main winding 110 and auxiliary winding direction, at each time p calculating becoming p=p2
I, j(i, j=0,1 ...) and minimizing number k2 (p) (step ST607).In Figure 10,, the particular range Δ p among the time p is calculated k2 (Δ p) sum h2=Σ k2 (Δ p) (step ST608) at the vibrational waveform of current waveform that flows through main winding 110 and auxiliary winding direction.
Next, by vibrational waveform at current waveform that flows through main winding 110 and auxiliary winding direction, the number h1 and the minimizing number h2 that difference constantly are in the maximum of specific range delta p compare, and judge the eccentric direction (step ST609) of air gap 101.Promptly at h1〉under the situation of h2, be judged to be air gap 101 to acceleration pick-up 122a+the direction off-centre of side.
In addition under the situation of h1＜h2, be judged to be air gap 101 to acceleration pick-up 122a-the direction off-centre of side.Alleged herein acceleration pick-up 122a+ side and-side is meant, the direction that the symbol of vibrational waveform is become positive vibration is called+side, the direction that the symbol of vibrational waveform is become negative vibration is called-side.
Last size according to the vibration of assisting winding direction calculates the offset (step ST610) of air gap 101.Zhen Dong size can utilize the effective value of vibrational waveform to obtain herein, perhaps also can utilize the average absolute of the vibration of the big direction of the absolute value of the vibration in the vibration of the vibration of forward of vibrational waveform and negative sense to obtain.And then also can utilize the mean value between the average absolute of intensity of vibration of the absolute value of intensity of vibration of forward and negative sense to obtain.
More than, the magnetic flux that is taken place by main winding 110 has been described greater than situation, but the bigger situation of magnetic flux that is taken place by auxiliary winding 111 has been described at following flow chart according to Figure 11 by the magnetic flux of assisting winding 111 to take place.Switch driving circuit will assist the magnetic flux that winding 111 takes place to be set as the magnetic flux (step ST700) that sends greater than by making electric current flow through main winding 110 by electric current is flow through.
Figure 12 is the circuit diagram that the drive circuit in the inspection device for air gap off-centering is shown, by main winding switch 144 being connected to contact 142 sides, and be connected in series main winding resistor 141 and main winding capacitor 140 (step ST700-1) of main winding 110 relatively.To assist winding switch 145 to be connected to contact 147 sides (step ST700-2) then.Adjust thus and flow through the electric current of each winding to reduce to flow through the electric current of main winding 110, and increase the electric current flow through auxiliary winding 111, will work as when switch in air gap 101 size by the magnetic flux of auxiliary winding 111 generations and be set as greater than size by the magnetic flux of main winding 110 generations.
Next, utilize voltage adjuster 134 that the voltage of AC power 150 is adjusted to specific voltage (step ST700-3).Next monocyclic-start induction motor is applied alternating voltage, begin to measure the electric current that flows through auxiliary winding 111 and the vibration (step ST701) of main winding direction.Utilize galvanometer 121b measurement to flow through the current waveform of auxiliary winding 111.Utilize acceleration pick-up 122b to measure the vibrational waveform (step ST702) of main winding direction in addition.
If passed through the Measuring Time of regulation, then finish to measure, also finish energising (step ST703) simultaneously.Measured current waveform is read in and records computer 132 via A/D plate (not shown).Utilize 131 pairs of measured vibrational waveforms of amplifier to amplify in addition, read in and record computer 132 (step ST704) via A/D plate (not shown).Flow through the current waveform of auxiliary winding 111 and the vibrational waveform of auxiliary winding direction by computer 132 utilizations, calculate the eccentric direction and the offset (step ST705) of the air gap of main winding direction.Figure 13 is the flow chart that is used to illustrate these computational methods.
In Figure 13, at first, calculate the moment t ' that current waveform becomes extreme value (peak, paddy) according to the current waveform that flows through auxiliary winding 111
i(i=0,1 ..., n ...) (step ST800).Next according to the vibrational waveform of main winding direction, calculate the moment t1 ' that vibrational waveform becomes maximum (peak)
j(j=0,1 ..., m ...) (step ST=801).Next according to the current waveform that flows through auxiliary winding 111 and the vibrational waveform of main winding direction, at each current waveform half period, the difference p1 ' in the moment of the maximum of the vibration in calculating during the electric current half-wavelength and the extreme value of electric current
I, j=t1 '
j-t '
i(step ST802).
Next, according to the current waveform that flows through auxiliary winding 111 and the vibrational waveform of main winding direction, calculating at each time p becomes p=p1 '
I, j(i, j=0,1 ...) and the number k1 ' (p) (step ST803) of maximum.Next, at the current waveform that flows through auxiliary winding 111 and the vibrational waveform of main winding direction, the particular range Δ p among the time p is calculated k1 ' (Δ p) sum h1 '=Σ k1 ' (Δ p) (step ST804).Next, according to the waveform of the vibration of main winding direction, calculate the moment t2 ' that vibrational waveform becomes minimum (paddy)
j(j=0,1 ..., m ...) (step ST805).
Next, according to the current waveform that flows through auxiliary winding 111 and the vibrational waveform of main winding direction, at each current waveform half period, the difference p2 ' in the moment of the minimum of the vibration in calculating during the electric current half-wavelength and the extreme value of electric current
I, j=t2 '
j-t '
i(step ST806).Next, according to the current waveform that flows through auxiliary winding 111 and the vibrational waveform of main winding direction, at each time p calculating becoming p=p2 '
I, j(i, j=0,1 ...) and minimizing number k2 ' (p) (step ST807).At the current waveform that flows through auxiliary winding 111 and the vibrational waveform of main winding direction, the particular range Δ p among the time p is calculated k2 ' (Δ p) sum h2 '=Σ k2 ' (Δ p) (step ST808).
Next, by at the current waveform that flows through auxiliary winding 111 and the vibrational waveform of main winding direction, the number h1 ' that difference constantly is in the maximum of specific range delta p compares with minimizing number h2 ', and judges the eccentric direction (step ST809) of air gap 101.Promptly at h1 '〉under the situation of h2 ', be judged to be air gap 101 to acceleration pick-up 122b+the direction off-centre of side.In addition under the situation of h1 '＜h2 ', be judged to be air gap 101 to acceleration pick-up 122b-the direction off-centre of side.
Then, calculate the offset (step ST810) of air gap 101 according to the size of the vibration of main winding direction.Turn back to the flow chart of Figure 11 once more, utilize air gap eccentric centre state of inferring out and the air gap eccentric centre state of inferring out according to the vibrational waveform of current waveform that flows through auxiliary winding 111 and main winding direction according to the vibrational waveform of current waveform that flows through main winding 110 and auxiliary winding direction, judge whether air gap 101 is good, on the display 133 of computer, show its result (step ST706).Narrate this whether good decision method in addition in the back.
Then, utilize acceleration pick-up cylinder 123 to make acceleration pick-up 122a, 122b retreat (step ST707).Next splicing ear 120 is dismantled (step ST708) from terminal 112.Next utilize clamping cylinder 127 to make clamping claw 120 retreat (step ST709).Remove the material 128 that shakes from workpiece at last and pull down rotary compressor 100 (step ST710).
Herein, there is the combination of various values in the electric capacity of the electric capacity of the size of auxiliary winding resistance device 148, auxiliary winding electric container 149, the size of main winding resistor 141, main winding capacitor 140 and to utilize the size of the voltage that voltage adjuster 134 adjusts be the size that is adjusted to size, condenser capacitance and the voltage that can make the resistance that rotor 102 rotates with the swing circle 2/3 below of the frequency of alternating voltage that each winding is applied.
So that the rotating speed of rotor becomes under the big situation, the uneven magnetic attraction of rotor effect is become big in the size of adjusting condenser capacitance and voltage, it is big that the reaction of the rotor during vibration becomes.In the vibrational waveform of such situation, be difficult to judge the vibration that causes by uneven magnetic attraction, still the vibration that causes by reaction.On the other hand, in the size of adjusting condenser capacitance and voltage so that under the situation that the rotating speed of rotor diminishes, uneven magnetic attraction to the rotor effect diminishes, the reaction of the rotor during vibration also diminishes, so the vibration that is caused by uneven magnetic attraction becomes clearly, is easy to judge the eccentric direction of air gap.The rotating speed of rotor is more little in addition, and the phase place that uneven magnetic attraction becomes the rotor in the maximum moment is different respectively, can measure the air gap eccentric centre state that is changed by the phase place of rotor accurately.Especially adjusting condenser capacitance and voltage so that under the situation that rotor rotates with the swing circle 2/3 below of the frequency of alternating voltage that each winding is applied, the vibration of 2 overtones bands of the electric voltage frequency applied takes place as shown in figure 14, so rotor rotate 1 week during uneven magnetic attraction to become maximum number of times be more than 3 times, can measure the vibration under the different rotor phase more than 3 kinds, even under the parts precision of rotor or stator, assembly precision condition of severe, can judge reliably also whether the air gap eccentric centre state is good.
In addition in said structure, show voltage adjuster, capacitor, resistor as utilizing each winding to be adjusted at the situation of the means of the magnetic flux that induces in the air gap 101, but also can use the current regulator of the electric current of adjusting winding.
Next, the concrete definite method about specific range delta p is described.Specific range delta p needs to set according to the supply frequency that monocyclic-start induction motor is applied, for example comprise under the situation of frequency component of 2 overtones band to 6 overtones bands of more power frequency that time p selects 0 second scope of about 1/12～1/4 to current cycle at measured vibrational waveform.
For example have in addition to use and know that in advance the monocyclic-start induction motor of air gap eccentric centre direction is used to set the experiment of Δ p, make frequency distribution table shown in Figure 10 and determine the method for the set point of specific range delta p.For example the eccentric direction of air gap be acceleration pick-up 122a, 122b+situation of side under, in made frequency distribution table, find to become k1 (p)〉k2 (p) or k1 ' (p) k2 ' scope (p), it is defined as Δ p, and for example the eccentric direction of air gap be acceleration pick-up 122a, 122b-situation of side under, in made frequency distribution table, find to become k1 (p)＜k2 (p) or k1 ' (p)＜k2 ' scope (p), it is defined as Δ p.
Under the situation that can select a plurality of scopes, preferably time p just is being made as and near 0 scope.Its former because, when current waveform becomes extreme value, uneven magnetic attraction (to the exciting force of rotor effect) becomes maximum, and rotor is to the narrow direction vibration of air gap, so the direction off-centre of the symbol of the extreme value of the vibrational waveform of air gap after current waveform just becomes extreme value.In Figure 10, as mentioned above the scope of Δ p is set as time p for just and near 0 scope.
The measurement of the off-centre when In view of the foregoing, measured vibrational waveform being comprised the frequency component of 2 overtones band to 6 overtones bands of more power frequency describes.Comprise under the situation of frequency component of 2 overtones band to 6 overtones bands of more power frequency at measured vibrational waveform as mentioned above, select about 1/12～1/4 scope to current cycle as specific range delta p.And then when selecting specific range delta p as mentioned above, preferably time p just is being made as and near 0 scope, so as shown in figure 10, select specific range delta p be to about 1/12～1/4 scope of current cycle and time p for just and near 0 scope.
Then in this specific range delta p, calculate k1 (Δ p) sum h1=Σ k1 (Δ p) as mentioned above, and calculate k2 (Δ p) sum h2=Σ k2 (Δ p), compare the eccentric direction of judging air gap 101 by number h1 and the minimizing number h2 that difference constantly is in the maximum of specific range delta p.Promptly at h1〉under the situation of h2, be judged to be air gap 101 to the acceleration pick-up+the direction off-centre of side.In addition under the situation of h1＜h2, be judged to be air gap 101 to the acceleration pick-up-the direction off-centre of side.Calculate the offset of air gap 101 then according to the size of vibration.
At each current waveform half period, there be the skew of several m about second in the maximum value minimum of the extreme value of current waveform and vibrational waveform, and there is deviation in this skew.For example as shown in figure 10, the time p of preestablishing becomes the scope of Δ p, compares with minimizing quantity sum Σ k2 (Δ p) by the quantity sum Σ k1 (Δ p) to the maximum in this scope, can judge the air gap eccentric centre direction.
For example at air gap 101 under the situation of the direction off-centre vertical with the winding direction of main winding 110, if electric current flows through main winding 110 and induces magnetic flux, then uneven magnetic attraction along with the directive effect of magnetic flux quadrature, rotor 102 moves to air gap 101 narrow directions.For example single-phase 2 utmost point induction motors are being applied under the situation of alternating voltage, magnetic flux follow electric current absolute value increase and become big, uneven magnetic attraction also increases.
If the absolute value of electric current becomes maximum (if promptly current waveform becomes extreme value), then uneven magnetic attraction also becomes maximum, and vibrational waveform is also got extreme value to the narrow direction of air gap.As the exemplary of the relation between current waveform and the vibrational waveform, as shown in figure 14, consider that vibrational waveform becomes the example of vibration of the frequency multiplication of current waveform.
But in the phase place of the extreme value of the current waveform of actual measurement and the minimizing phase place of maximum value, exist under the situation of phase deviation as the vibrational waveform of the frequency multiplication of power frequency, also measure the vibration or the interference of the such high order of 4 overtones bands of power frequency and 6 overtones bands, so measured vibrational waveform for example becomes waveform shown in Figure 8, and is difficult to judge the air gap eccentric centre direction.
Herein as mentioned above, distribute, can grasp the skew of current waveform and vibrational waveform clearly by calculate the current waveform moment that becomes extreme value and the frequency that vibrational waveform becomes the maximum and the difference in the minimizing moment at each current waveform half-wavelength.By preestablishing specific range delta p as mentioned above, can carry out the correct judgement of air gap eccentric centre direction for the skew of time.
In addition in the above description, to calculating the moment t of current waveform
i, or t '
iSituation be illustrated, but also can for example replace current waveform to become the moment of extreme value and calculate current waveform and become moment of zero and ask t
i, or t '
iIn addition in the above description, the situation that the current waveform and the vibrational waveform of monocyclic-start induction motor energising are inferred the air gap eccentric centre direction of using has been described, but for example also can not measure current waveform to the monocyclic-start induction motor energising, but, ask the phase difference of voltage waveform and vibrational waveform by measuring the waveform of the voltage that monocyclic-start induction motor is applied.
Next to judging whether good unit describes air gap.Uneven magnetic attraction to rotor 102 effects is to determine by the size and the air gap offset of magnetic flux, so, can infer the air gap eccentric centre amount according to the size of vibration by in advance the direction of measuring vibrations being investigated the relation of the size of air gap eccentric centre amount and vibration respectively.Promptly in by the stage before the welded seal rotary compressor 100, utilize measurement air gap eccentric centre amounts such as meter, and the size of the vibration when measuring the alternating voltage applied regulation is made the data of the dependency relation of the size of expression vibration and air gap offset.
After having assembled rotary compressor 100, about the direction vertical with the magnetic flux that when main winding 110 is flow through electric current, induces and with vertical these 2 directions of direction of magnetic flux that when auxiliary winding 111 has been flow through electric current, induced, size and ready-made above-mentioned data to the vibration of measuring respectively compare, thereby can infer the air gap eccentric centre amount, so the air gap eccentric centre amount according to the above description and the result of calculation of air gap eccentric direction are shown as two-dimensional coordinate system with the air gap eccentric centre state table, can judge whether air gap is good.
By constituting as described above, according to the present invention under the completion status of can't be direct visual rotor 102 and the product of the position relation of stator 103, even under the situation of the deviation of processing that has each monocyclic-start induction motor or assembling or interference, also need not in drive circuit or measuring system, to install noise removing unit such as noise filter, and can check the air gap eccentric centre state accurately.
Execution mode 2
In the present embodiment, the winding that will flow through electric current when measuring only is made as a certain side in main winding 110 and the auxiliary winding 111, and checks air gap eccentric centre direction and air gap offset when rotor 102 is lock-out state.The rotary compressor 100 that comprises monocyclic-start induction motor is identical with the part shown in Fig. 1 and Fig. 2, and the outward appearance of inspection device for air gap off-centering of monocyclic-start induction motor that the rotary compressor 100 that the freezing air conditioner of built-in monocyclic-start induction motor is used is made as measured body is also identical with Fig. 3, part shown in Figure 4, but drive circuit difference.
Figure 15, Figure 16 are the circuit diagrams that the drive circuit in the inspection device for air gap off-centering of embodiments of the present invention 2 is shown, in the drawings, at the drive circuit that is used for making electric current flow through rotary compressor 100 main winding power-on switch 151 and auxiliary winding power-on switch 152 are set.In drive circuit figure shown in Figure 15, when main winding switch 151 is on and an auxiliary winding switch 152 during for off, electric current only flows through main winding 110.In addition in drive circuit figure shown in Figure 16, when main winding switch 151 is off and auxiliary winding switch 152 during on, electric current only flows through auxiliary winding 111.
In the present embodiment, the switching of drive circuit is different with the situation of execution mode 1.Promptly in present embodiment 1, motor is applied alternating voltage, and rotor 102 is made as rotation status, but in the present embodiment, owing to only apply alternating voltage,, and under lock-out state, vibrate so rotor 102 does not rotate to main winding 110 or auxiliary winding 111.
In the switching of the drive circuit of the step ST504 in above-mentioned execution mode 1, as shown in Figure 6, the connection destination of main winding switch 144 is made as contact 143 sides, the connection destination of auxiliary winding switch 145 is made as contact 146 sides, and assists winding resistance device 148 and auxiliary winding electric container 149 assisting winding 111 to be connected in series.Relative with it in the present embodiment, as shown in figure 15, by main winding power-on switch 151 is made as on, and will assist winding power-on switch 152 to be made as off, and make electric current only flow through main winding 110.
In addition in the switching of the drive circuit of the step ST700 in execution mode 1, as shown in figure 12, the connection destination of main winding switch 144 is made as contact 142 sides, connection destination that will auxiliary winding switch 145 is made as contact 147 sides, and to main winding 110 be connected in series main winding resistor 141 and main winding capacitor 140.Relative with it in the present embodiment, as shown in figure 16, by main winding power-on switch 151 is made as off, and will assist winding power-on switch 152 to be made as on, and make electric current only flow through auxiliary winding 111.
By constituting as described above, monocyclic-start induction motor is being applied under the situation of alternating voltage, rotor 102 does not rotate and becomes lock-out state, can infer out air gap eccentric direction and offset according to vibrational waveform under the lock-out state and current waveform.Similarly infer the means of air gap eccentric centre direction and offset in addition with the situation of explanation in above-mentioned execution mode 1.
In the present embodiment, owing under rotor 102 non-rotary lock-out states, carry out vibration measurement, even so for example under fully not lubricated oil condition between main shaft 105 and the base bearing (not shown), can not damage base bearing (not shown) yet, and can measure air gap eccentric centre direction and air gap offset.
Execution mode 3
In the present embodiment, when measuring,, check air gap eccentric centre direction and air gap offset accurately by adjusting the frequency of the voltage that is applied.The rotary compressor 100 that comprises monocyclic-start induction motor is identical with the part shown in Fig. 1 and Fig. 2, and the outward appearance of inspection device for air gap off-centering of monocyclic-start induction motor that the rotary compressor 100 that the freezing air conditioner of built-in monocyclic-start induction motor is used is made as measured body is also identical with Fig. 3, part shown in Figure 4, but drive circuit difference, in the present embodiment, additional have a frequency adjuster 153.
Figure 17, Figure 18 are the circuit diagrams that the drive circuit in the inspection device for air gap off-centering of embodiments of the present invention 3 is shown.In the switching of the drive circuit of the step ST504 in above-mentioned execution mode 1, as shown in Figure 6, the connection destination of main winding switch 144 is made as contact 143 sides, the connection destination of auxiliary winding switch 145 is made as contact 146 sides, and assist winding resistance device 148 and auxiliary winding electric container 149, and then utilize voltage adjuster 134 that voltage is adjusted to specific voltage to assisting winding 111 to be connected in series.
Relative with it in the present embodiment, as shown in figure 17, the connection destination of main winding switch 144 is made as contact 143 sides, to assist the connection destination of winding switch 145 to be made as contact 146 sides simultaneously, and assist winding resistance device 148 and auxiliary winding electric container 149 assisting winding 111 to be connected in series.Afterwards, utilize frequency adjuster 153 that supply frequency is adjusted to specific frequency, utilize voltage adjuster 134 that voltage is adjusted to specific voltage.
In addition in the switching of the drive circuit of the step ST700 in execution mode 1, as shown in figure 12, the connection destination of main winding switch 144 is made as contact 142 sides, to assist the connection destination of winding switch 145 to be made as contact 147 sides simultaneously, and, utilize voltage adjuster 134 that voltage is adjusted to specific voltage afterwards to main winding 110 be connected in series main winding resistor 141 and main winding capacitor 140.
Relative with it in the present embodiment, as shown in figure 18, the connection destination of main winding switch 144 is made as contact 142 sides, and the connection destination that will assist winding switch 145 is made as contact 147 sides, and to main winding 110 be connected in series main winding resistor 141 and main winding capacitor 140, utilize frequency adjuster 153 that supply frequency is adjusted to specific frequency afterwards, utilize voltage adjuster 134 that voltage is adjusted to specific voltage.
Herein, the electric capacity of the electric capacity of the size of auxiliary winding resistance device 148, auxiliary winding electric container 149, the size of main winding resistor 141, main winding capacitor 140, to utilize the supply frequency that frequency adjuster 153 adjusts and utilize the size of the voltage that voltage adjuster 153 adjusts be size and the frequency that is adjusted to the size that can make the resistor that rotor 102 rotates with the swing circle 2/3 below in the cycle of magnetic flux, condenser capacitance, voltage, has the combination of various values.Voltage adjuster, capacitor, resistor are used in addition herein and adjusted the means of the magnetic flux that induces by each winding, but also can use the current regulator of the electric current of adjusting winding.
In the present embodiment, equal at the integral multiple of supply frequency under the situation of intrinsic vibration number (frequency) of monocyclic-start induction motor, covibration takes place, it is big that measured vibration becomes, and be difficult to judge the direction of vibration, but by utilizing frequency adjuster 153 to adjust supply frequency, can avoid resonance frequency to measure, can judge accurately whether the air gap eccentric centre state is good.
In addition in above-mentioned execution mode 1 or 3, the capacitor and the resistor of impedance fixed are installed in drive circuit, but also can use the capacitor and the resistor of changeable type, in this case, can constitute the drive circuit that to tackle multimachine kind monocyclic-start induction motor less expensively.In addition in above-mentioned execution mode 1 or 3, show the example of the means that the magnetic flux that is induced by main winding 110 that capacitor and resistor are taken place when flowing through alternating current with opposing and the ratio of the size of the magnetic flux that is induced by auxiliary winding 111 adjust, but also can connect the impedance that each winding is adjusted in reactance.
And then in Fig. 3, show and used as the acceleration pick-up 122a of the type of measuring vibrations, the situation of 122b by measuring body is pushed, utilize magnet or bonding agent to wait the type of installing but also can use, need not to be provided for clamping the clamp system and the cylinder body of housing 104 in this case, so can constitute testing fixture at an easy rate.
In addition in Fig. 3, show the example that utilizes 131 pairs of vibrations of measuring of amplifier to amplify by acceleration pick-up 122a, 122b, but it is built-in also can to constitute preamplifier by degree of will speed up pick-up, and the function to the preamplifier supply capability is set in addition, and need not externally to be provided with amplifier 131.
Example illustrates as the unit that detects vibration and is provided with the situation of acceleration pick-up 122a, 122b in addition, but the vibration detecting unit that detects the type of vibration according to displacement and positional information for example also can be set.And then in Fig. 3,, show the galvanometer 121a that is provided with clamped-in style, the situation of 121b as the galvanometer that is used to measure electric current, but also can constitute galvanometer is installed in drive circuit in advance.
Execution mode 4
In the present embodiment, the winding that will apply voltage when measuring only is made as main winding 110 or auxiliary winding 111 and rotor 102 is made as lock-out state, and utilize frequency adjuster 153 to be adjusted at the frequency of the voltage that applies when measuring, thereby check air gap eccentric centre direction and air gap offset accurately.
The rotary compressor 100 that comprises monocyclic-start induction motor is identical with the part shown in Fig. 1 and Fig. 2, and the outward appearance of inspection device for air gap off-centering of monocyclic-start induction motor that the rotary compressor 100 that the freezing air conditioner of built-in monocyclic-start induction motor is used is made as measured body is also identical with Fig. 3, part shown in Figure 4, but the drive circuit difference is provided with frequency adjuster 153.
Figure 19, Figure 20 are the circuit diagrams that the drive circuit in the inspection device for air gap off-centering of embodiments of the present invention 4 is shown.In the drawings, be provided with main winding power-on switch 151 and auxiliary winding power-on switch 152 at the drive circuit that is used for making electric current flow through rotary compressor 100.In drive circuit figure shown in Figure 19, when main winding switch 151 is on and an auxiliary winding switch 152 during for off, electric current only flows through main winding 110.In addition in drive circuit figure shown in Figure 20, when main winding switch 151 is off and auxiliary winding switch 152 during on, electric current only flows through auxiliary winding 111.
Below for the explanation of the action in the present embodiment, the discrepancy with execution mode 2 is described.In above-mentioned execution mode 2, as shown in figure 15, main winding power-on switch 151 is made as on, will assist winding power-on switch 152 to be made as off simultaneously, and make electric current only flow through main winding 110, utilize voltage adjuster 134 that voltage is adjusted to specific voltage afterwards.
Relative with it in the present embodiment, as shown in figure 19, main winding power-on switch 151 is made as on, to assist winding power-on switch 152 to be made as off simultaneously, and make electric current only flow through main winding 110, utilize frequency adjuster 153 that supply frequency is adjusted to specific frequency afterwards, and then utilize voltage adjuster 134 that voltage is adjusted to specific voltage.
In addition in above-mentioned execution mode 2, as shown in figure 16, by main winding power-on switch 151 is made as off, will assist winding power-on switch 152 to be made as on simultaneously, and make electric current only flow through auxiliary winding 111, utilize voltage adjuster 134 that voltage is adjusted to specific voltage afterwards.
Relative with it in the present embodiment, as shown in figure 20, by main winding power-on switch 151 is made as off, to assist the winding energising to open and close 152 simultaneously and be made as on, and make electric current only flow through auxiliary winding 111, utilize frequency adjuster 153 that supply frequency is adjusted to specific frequency afterwards, and then utilize voltage adjuster 134 that voltage is adjusted to specific voltage.
Herein, utilize the supply frequency of frequency adjuster 153 adjustment and utilize the size of the voltage of voltage adjuster 134 adjustment to be adjusted to the integral multiple that supply frequency does not become the intrinsic vibration number (frequency) of monocyclic-start induction motor, and make because the influence that noise causes becomes small, have the combination of various values.Herein as the unit of adjusting the magnetic flux that induces by each winding, use voltage adjuster 134 in addition, but also can use the current regulator of the electric current of adjusting winding.
In the present embodiment with the situation of execution mode 2 similarly, under rotor 102 non-rotary lock-out states, carry out vibration measurement, even so for example under fully not lubricated oil condition between main shaft 105 and the base bearing (not shown), can not damage base bearing (not shown) yet, and can measure air gap eccentric centre direction and air gap offset.
And then in the present embodiment with the situation of execution mode 3 similarly, equal at the integral multiple of supply frequency under the situation of intrinsic vibration number (frequency) of monocyclic-start induction motor, covibration takes place, it is big that measured vibration becomes, and be difficult to judge the direction of vibration, but by utilizing frequency adjuster 153 to adjust supply frequency, can avoid resonance frequency to measure, can judge accurately whether the air gap eccentric centre state is good.
In the present embodiment, to after having checked inspection device for air gap off-centering, carry out the method for revising and describe.Figure 21 is the profile that the uv coordinate system that is used for representing two-dimensionally the air gap eccentric centre state is shown, and Figure 22 is the profile that the method that is used to revise the air gap eccentric centre state is shown.
It is identical with the part of explanation in the above-mentioned execution mode 1 to become the rotary compressor that comprises monocyclic-start induction motor 100 of checking object, and the method for the air gap eccentric centre state of inspection rotary compressor 100 also the situation with execution mode 1 is identical.Below, the method for revising the air gap eccentric centre state according to the result who is checked is elaborated.
In Figure 21, degree of will speed up pick-up 122a is made as the u axle, and degree of will speed up pick-up 122b is made as the v axle.In above-mentioned execution mode 1, by the air gap eccentric centre direction of the auxiliary winding direction that in the step ST509 of Fig. 5, calculates with the coordinate representation on the u axle and the result of offset, and the air gap eccentric centre mode of the main winding direction that calculates in the step ST705 of Figure 11 with the coordinate representation on the v axle and the result of offset can represent the direction that the air gap of monocyclic-start induction motor narrows down two-dimensionally.
The monocyclic-start induction motor of object that becomes inspection is owing to be fixed in the inside of housing 104, so by making housing 104 distortion revise the air gap state of monocyclic-start induction motor.As the method that makes housing 104 distortion, 104 heating of pair housing are for example arranged and make the method for its distortion, as shown in figure 22, can utilize pulverizing jet 160 to make housing 104 distortion.
General under the situation of external heat housing 104, housing 104 is deformed into to the direction that is heated and becomes spill after cooling.Stator 103 is fixed in housing 104 by hot jacket, and the central shaft of stator 103 tilts along with the distortion of housing 104, thus the air gap eccentric centre state variation.According to the check result of above-mentioned air gap eccentric centre state, the direction narrow from air gap heats, and adjustment adds heat according to the air gap eccentric centre amount, thereby can revise the air gap eccentric centre state.
Figure 22 illustrates the method for utilizing pulverizing jet 160 to heat, but the heater means of housing 104 is not limited to pulverizing jet, for example also can uses high-frequency heating, laser and TIG welding etc.In high-frequency heating, laser and TIG welding, owing to compare the heat that adds that is easy to control at housing 104 with pulverizing jet, so can revise the air gap eccentric centre state accurately.In the present embodiment as the means that make housing 104 distortion, the direction that heats has been described in addition, has made housing 104 distortion but for example also can use hammer etc. to knock.
Claims (7)
1. the inspection device for air gap off-centering of a monocyclic-start induction motor, this monocyclic-start induction motor comprises: rotor, rotate with main shaft; And stator, be configured to possess main winding and auxiliary winding and and above-mentioned rotor between have air gap, wherein, this inspection device for air gap off-centering is characterised in that, is provided with: the unit that above-mentioned main winding and auxiliary winding is applied alternating voltage; Current measuring unit, the current waveform of the electric current of above-mentioned main winding and auxiliary winding is flow through in measurement; The vibrational waveform of vibration that the uneven magnetic attraction that takes place becomes the monocyclic-start induction motor of maximum direction when above-mentioned main winding and auxiliary winding have been applied above-mentioned alternating voltage, is measured in the vibration measurement unit in above-mentioned rotor; And identifying unit, utilize the amplitude meter of above-mentioned vibrational waveform to calculate the offset of above-mentioned air gap, and calculate the moment poor that moment that current waveform becomes extreme value and vibrational waveform become maximum value or minimum value at the half-wavelength of each current waveform, distribute with frequency and to represent the poor of moment of being calculated, the number and the minimizing number that the difference in the described moment are in the maximum of specific scope compare, judge the eccentric direction of air gap thus, the offset and the eccentric direction of the air gap that goes out according to aforementioned calculation judge whether above-mentioned air gap is good.
2. the inspection device for air gap off-centering of monocyclic-start induction motor according to claim 1, it is characterized in that, be provided with drive circuit, this drive circuit is when having applied alternating voltage to above-mentioned main winding and auxiliary winding, under the state of magnetic flux that in air gap, induces by a winding in above-mentioned main winding and the auxiliary winding, make above-mentioned rotor rotation greater than the magnetic flux that in air gap, induces by another winding.
3. the inspection device for air gap off-centering of monocyclic-start induction motor according to claim 2 is characterized in that, is provided with drive circuit, and this drive circuit makes above-mentioned rotor rotation with the swing circle below 2/3 of the frequency of the alternating voltage that applied.
4. the inspection device for air gap off-centering of monocyclic-start induction motor according to claim 1, it is characterized in that, be provided with drive circuit, this drive circuit only applies alternating voltage to one in above-mentioned main winding and the above-mentioned auxiliary winding, and switches the winding that applies above-mentioned alternating voltage.
5. according to the inspection device for air gap off-centering of any described monocyclic-start induction motor in the claim 1～4, it is characterized in that possessing the voltage adjustment mechanism that is used to change above-mentioned alternating voltage.
6. according to the inspection device for air gap off-centering of any described monocyclic-start induction motor in the claim 1～4, it is characterized in that possessing the frequency translation mechanism of the frequency that is used to change above-mentioned alternating voltage.
7. the air gap modification method of a monocyclic-start induction motor, this monocyclic-start induction motor comprises: rotor, rotate with main shaft; And stator, be configured to possess main winding and auxiliary winding and and above-mentioned rotor between have air gap, wherein, this air gap modification method is characterised in that, above-mentioned main winding and auxiliary winding are applied alternating voltage, the current waveform of the electric current of above-mentioned main winding and auxiliary winding is flow through in measurement, and when above-mentioned main winding and auxiliary winding have been applied above-mentioned alternating voltage, the uneven magnetic attraction that measurement takes place in above-mentioned rotor becomes the vibrational waveform of vibration of the monocyclic-start induction motor of maximum direction, utilize the offset of the above-mentioned air gap of magnitude determinations of measured above-mentioned vibrational waveform, and calculate the moment poor that moment that current waveform becomes extreme value and vibrational waveform become maximum value or minimum value at the half-wavelength of each current waveform, distribute with frequency and to represent the poor of moment of being calculated, the number and the minimizing number that the difference in the described moment are in the maximum of specific scope compare, judge the eccentric direction of air gap thus, the offset and the eccentric direction of the air gap that goes out according to aforementioned calculation judge whether above-mentioned air gap is good, make the housing distortion that is fixed with said stator according to this result of determination, thereby revise the air gap of above-mentioned monocyclic-start induction motor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008012380A JP4474469B2 (en) | 2008-01-23 | 2008-01-23 | Single-phase induction motor air gap eccentricity inspection device and air gap correction method |
| JP2008-012380 | 2008-01-23 | ||
| JP2008012380 | 2008-01-23 |
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| CN101494410A CN101494410A (en) | 2009-07-29 |
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| JP5100528B2 (en) * | 2008-06-19 | 2012-12-19 | 三菱電機株式会社 | Single-phase induction motor air gap eccentricity inspection apparatus, air gap eccentricity inspection method, air gap eccentricity adjustment method, and single-phase induction motor manufactured using the same |
| JP5511281B2 (en) * | 2009-09-24 | 2014-06-04 | 三菱電機株式会社 | Method for measuring rotor axial position of rotating electrical machine and rotor axial position measuring apparatus for rotating electrical machine |
| CN103595202B (en) * | 2013-11-19 | 2016-05-25 | 江苏航天动力机电有限公司 | The dynamically balanced method of calibration of a kind of rotor |
| CN104079118B (en) * | 2014-07-07 | 2016-10-05 | 华北电力大学（保定） | A kind of dynamic model generating set simulating air-gap eccentric fault and analogy method |
| JP6466272B2 (en) * | 2015-07-13 | 2019-02-06 | 株式会社三共製作所 | Transformer |
| CN104965175B (en) * | 2015-07-16 | 2017-10-10 | 华北电力大学（保定） | A kind of detection method in the static fault of eccentricity orientation of power generator air gap and fault degree |
| CN105044601A (en) * | 2015-08-25 | 2015-11-11 | 合肥工业大学 | Eccentric detection apparatus using leakage magnetic field detection induction motor and detection method thereof |
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| CN101083416A (en) * | 2006-05-30 | 2007-12-05 | 三菱电机株式会社 | Air gap eccentricity measuring device for motor and measuring method therefor |
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| CN101083416A (en) * | 2006-05-30 | 2007-12-05 | 三菱电机株式会社 | Air gap eccentricity measuring device for motor and measuring method therefor |
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| JP昭60-152262A 1985.08.10 |
| JP特开2007-37323A 2007.02.08 |
| JP特开平6-284655A 1994.10.07 |
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| JP4474469B2 (en) | 2010-06-02 |
| CN101494410A (en) | 2009-07-29 |
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