CN105915148A - Motor drive system, motor control method and electric conversion device - Google Patents
Motor drive system, motor control method and electric conversion device Download PDFInfo
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- CN105915148A CN105915148A CN201610045502.5A CN201610045502A CN105915148A CN 105915148 A CN105915148 A CN 105915148A CN 201610045502 A CN201610045502 A CN 201610045502A CN 105915148 A CN105915148 A CN 105915148A
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- output voltage
- scheduled time
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The present invention provides a motor drive system, a motor control method and an electric conversion device. The state of the motor is determined and the occurrence of motor faults is inhibited by a simple structure. The motor drive system comprises a motor (3) configured to determine the state of the motor and the electric conversion device configured to inhibit the faults of the motor. The electric conversion device (1) outputs alternating voltage in a presetting frequency to the motor so as to drive the motor and determines whether the output voltage is larger than a presetting value or not according to the changing of the output voltage in a presetting time, when the output voltage is larger than the presetting value, it is determined that the abnormality is detected, and the presetting frequency value is reduced.
Description
Technical field
The present invention relates to a kind of electric motor drive system, the control method of motor and power-converting device.
Background technology
The electric motor drive system using the power-converting device being commonly referred to as inverter generates changeable frequency
Alternating electromotive force be supplied to motor, thus motor is carried out variable speed drive.Thus, motor drives
Dynamic system can control to use the operating of the slewing of the motor such as fan, pump, compressor.
But, in the motor, the most under normal circumstances but use in the environment of harsh.Example
As, it is arranged in equipment as hundreds of meters～the compressor of deep under ground of several kilometers, pump the electronic of use
Machine operates in the environment of high temperature, high humidity, corrosive gas atmosphere etc. are harsh.In this case, motor
With power-converting device via hundreds of meters～several kilometers of long cable electrical connections.
The motor used in the environment of harsh possesses the protection merit that refrigerating function, function of shielding etc. are necessary
Energy.But, if motor is persistently affected by high temperature, corrosion etc., then the motor constant such as impedance becomes
Changing, the driving of motor likely produces bad.If the driving of motor produces bad, then slewing
Will not as expect as action, including this slewing whole equipment running rate reduce.
Here, known following prior art, will arrange in the motor or motor week by various sensors
Limit, analyzes the signal of these sensors, thus estimates the state of motor, it is determined whether there occurs abnormal (special
Profit document 1).In the prior art, according to the electric current of the output electric current applied to motor from inverter
The magnitude of voltage of value and output voltage calculates motorrun state value, and the motor operation calculated according to this
State value, it is determined that whether motor there occurs exception.
Prior art as other, it is known that compare actual power consumption and the presumption power consumption of motor,
The abnormality (patent documentation 2) of control device of electric motor is judged according to this comparative result.
In the prior art described in patent documentation 1, according to current value and the magnitude of voltage detection electricity of motor
The operating condition of motivation.But, use instantaneous value as these current values and magnitude of voltage, therefore there occurs
In the case of the transient change of burst, it is possible to error detection is abnormality.
In the prior art of patent documentation 1, it is also possible to sentence in the case of consecutive numbers cycle detection goes out extremely
It is set to abnormality.But, motor constant changes lentamente aging in the environment of harsh
In the case of, only it is difficult to correctly judge the abnormality of motor according to the monitoring result of one number time.
In the prior art described in patent documentation 2, the feelings of the state certain time more than threshold value
Under condition, it is determined that be the exception of control device of electric motor.But, in patent documentation 2, electronic in order to detect
The actual power consumption of machine, needs voltage sensor and current sensor, and in order to computing estimates consumed work
Rate, in addition it is also necessary to for measuring the velocity sensor of the rotating speed of motor.Further, velocity sensor must be provided with
Near motor body or its, it is therefore necessary to possess tolerance high temperature, high humidity, corrosive gas atmosphere etc. tight
The specification of cruel environment.Can such harsh in the environment of use velocity sensor the most expensive, also need
Carry out the installation operation of this sensor.
Further, in the prior art described in patent documentation 1 and patent documentation 2, motor is being detected
Or in the case of the abnormality of control device of electric motor, be emergent stopping motor in order to ensure safety,
Control entirely without the life-span considered for extending motor.The motor one used in the environment of harsh
As be difficult to be carried out upkeep operation by operator, it is therefore desirable to fault is prevented trouble before it happens.
Patent documentation 1: Japanese Unexamined Patent Publication 2012-75293 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2009-207315 publication
Summary of the invention
The present invention is conceived to the problems referred to above and proposes, and its object is to, it is provided that a kind of motor-driven system
System, the control method of motor and power-converting device, it can be by fairly simple structural determination electricity
The state of motivation, suppression motor breaks down.Other objects of the present invention are, it is provided that a kind of motor
Drive system, the control method of motor and power-converting device, its not operating speed sensor etc. arrange
Special sensor at motor body or its periphery just can determine that the state of motor, it is possible to suppression event
The generation of barrier.
In order to solve the problems referred to above, the electric motor drive system of the present invention possesses: motor；And to this electricity
Motivation carries out the power-converting device of variable speed drive, and power-converting device is by frequency predetermined to motor output
The alternating voltage of rate, drives motor, according to the change in the scheduled time of the output voltage of motor,
Judge whether output voltage has carried out the change of more than predetermined value, carried out more than predetermined value at output voltage
In the case of change, it is determined that for detecting abnormal omen, reduce the value of preset frequency.
According to the present invention, according to the change in the scheduled time of the output voltage of motor, the abnormal omen of detection,
Therefore, it is possible to instantaneous value by happening suddenly does not detects the abnormal omen of motor with being affected.Further, according to this
Invention, if it is decided that for detecting abnormal omen, then reduce the predetermined frequency of the alternating electromotive force applied to motor
Rate, therefore, it is possible to suppression motor fault.In the present invention, it is possible to increase the maintainability of motor is with reliable
Property.
Accompanying drawing explanation
Fig. 1 is the overall structure figure of the electric motor drive system of first embodiment.
Fig. 2 is represent output voltage values and the voltage instruction value caused because of resistance variations change with simulating
Chart.
Fig. 3 is the flow chart representing the process controlling the output to motor.
Fig. 4 is the overall structure figure of the electric motor drive system of the second embodiment.
Fig. 5 relates to the 3rd embodiment, is to represent the flow chart that output control processes.
Fig. 6 is the explanatory diagram of the example calculation of the meansigma methods representing output voltage.
Fig. 7 relates to the 4th embodiment, is to represent the flow chart that output control processes.
Fig. 8 relates to the 5th embodiment, is to represent the flow chart that output control processes.
Detailed description of the invention
Hereinafter, embodiments of the present invention are described with reference to the accompanying drawings.In the present embodiment, preset frequency is passed through
Alternating voltage drive motor 3, detect the abnormal omen of the motor 3 caused because of environment etc., and tackle
This exception omen, thus improves the life and reliability of motor 3.
In the electric motor drive system of present embodiment, motor 3 is carried out variable speed drive, therefore sets
Put the power-converting device 1 of the alternating voltage of output preset frequency.At power-converting device 1 with constant
In the case of frequency drives motor 3, in the power-converting device 1 output voltage change in the scheduled time
In the case of more than predetermined value, it is determined that for detecting abnormal omen, the alternating current that will export to motor 3
The frequency of power is reduced to other values bigger than 0.
Output voltage in first scheduled time and second are made a reservation for by the power-converting device 1 of present embodiment
Output voltage in time compares, second scheduled time by with first scheduled time in use pre-
Determine the identical frequency of frequency and drive motor.Output voltage in first scheduled time can also be pre-first
Fix time the meansigma methods of multiple output voltages of interior measurement.Equally, the output voltage in second scheduled time is also
It can be the meansigma methods of the multiple output voltages measured within second scheduled time.Defeated according in the scheduled time
Go out the abnormal omen of voltage detecting motor, therefore, it is possible to that reduces that the instantaneous value that happen suddenly by noise etc. affects can
Energy property, it is possible to be correctly detected abnormal omen.
The electric motor drive system of present embodiment such as controls to be arranged on the fan of deep under ground, pump, compression
The driving of the motor 3 used in machine etc..The power-converting device 1 of electric motor drive system is such as by number
Hundred meters of cables 2 to several kilometers of such length are connected with motor 3.Underground more than hundreds of meters is high temperature, height
The harsh environment such as wet, corrosive gas atmosphere, therefore operator is difficult to manually tie up motor 3
Protect operation.It addition, for the state measuring motor 3, main body or its periphery at motor 3 arrange biography
In the case of sensor, it is necessary to use the sensor of special tectonic.With the upkeep operation being difficult to motor 3
Similarly, operator is difficult to the sensor to this special tectonic and carries out upkeep operation.Accordingly, it would be desirable to
The electric motor drive system of the motor 3 used in the environment of harsh does not use the sensor of special tectonic, and
Can be by the state (abnormal omen) of simple structural determination motor 3.It addition, at harsh environment
Under be also difficult to the upkeep operation such as part replacement of motor 3, therefore from the sight of the overall running rate of equipment
Point sets out, and the fault of suppression motor 3 occurs also to be preferable.Hereinafter, present embodiment is described in detail
The configuration example of electric motor drive system.
[embodiment one]
Use Fig. 1～Fig. 3 that first embodiment is described.Fig. 1 represents the overall structure of electric motor drive system.
Power-converting device 1 drives motor 3 via cable 2.Motor 3 is by from power-converting device
1 output three-phase ac power and rotate.The long cable that cable 2 is e.g. more than 500 meters.Electronic
Machine 3 in the local use of underground hundreds of meters to several kilometers, uses long cable the most sometimes in this case
2.Power-converting device 1 and motor 3 away from the case of, be sometimes difficult to from power-converting device 1
Side confirms the situation of motor 3.
Power-converting device 1 is such as arranged in building on the ground, provides preset frequency to motor 3
Alternating electromotive force.Can suitably determine the value of preset frequency.Power-converting device 1 such as can utilize
Motor 3 is controlled from the signal of voltage detection department 4, current detecting part 5.Voltage detection department 4, electric current are examined
Survey portion 5 can be arranged between cable 2 and power-converting device 1.Voltage detection department 4, current detecting part
5 need not to be arranged on the main body of motor 3 or its near.Voltage detection department 4 detects as output voltage values
Feedback voltage level VFB, be subsequently transmitted to change in voltage test section 16.Current detecting part 5 is to electricity
Force conversion system 1 sends the feedback current IFB as output current value.
The power-converting device 1 of present embodiment is such as configured to Voltage type inverter.Electric power becomes
Changing device 1 such as possesses speed command operational part 11, speed command correction portion 12, voltage command operation portion
13, alternating voltage ordering calculation portion 14, PWM (pulse width modulation) operational part 15.Further, electric power
Converting means 1 can also be connected with user interface part 21.
Speed command operational part 11 has the function of arithmetic speed command value ω 1*.Speed command correction portion 12
Have Negotiation speed ordering calculation portion 11 according to the change in voltage detected by change in voltage test section 16
The speed value ω 1* calculated is modified to the function of speed value ω 1**.
Voltage command operation portion 13 has according to revised speed value ω 1** calculating based on vector control
The function of DC voltage command value V* of system.Alternating voltage ordering calculation portion 14 has according to unidirectional current end finger
Make the function of value V* computing alternating voltage command value.PWM operational part 15 is raw according to alternating voltage command value
Become pwm pulse, and export to motor 3.It is to electricity in accordance with the pwm pulse of alternating voltage command value
The alternating electromotive force (alternating voltage) of the preset frequency that motivation 3 applies.
The change of output voltage can also be replaced, and use the change of the current detection value from current detecting part 5
Change.Speed command correction portion 12 can also be according to the change of current detection value, repairing of arithmetic speed command value
On the occasion of ω 1**.
User interface part 12 can possess the both sides of message input device and information output apparatus.As information
Input equipment, such as, have button class, keyboard, acoustic input device, dial etc..As information output dress
Put, such as, have display, printer, speech synthesizing device etc..Additionally, user interface part 21 can also
The state etc. of motor 3 is notified by sending Email to manager.
Electric motor drive system uses power-converting device 1, controls with constant speed (constant preset frequency)
Motor 3 processed.About the output voltage of the motor 3 with constant speed drive, even if such as there occurs non-
Smoothly load change, if but with the meansigma methods of long time (such as a few hours～a couple of days) from the point of view of,
Think constant.This is because the change of the output voltage values of burst is buried in the output of long-time observation
In the meansigma methods of magnitude of voltage.
If motor 3 there occurs the worst, then it is assumed that be motor constant (resistance, inductance etc.)
There occurs the situation of change.In this case, flow through the curent change of motor 3, because using this electric current
Value controls motor 3, so the change of the voltage instruction value of power-converting device 1, output voltage values.If
The constant change of motor 3, and keeps constant and does not recovers, then power-converting device 1 voltage instruction value,
Output voltage values also keeps there occurs change.
Therefore, in the present embodiment, the voltage instruction value because the change of motor constant causes, output are used
The change of magnitude of voltage, the abnormal omen of detection motor 3.In the present embodiment, such as by using voltage
Change-detection portion 16, detects the change of the output voltage values of power-converting device 1.
For example, it is contemplated that as resistance components R of motor constant and inductance composition L.Can examine as follows
Consider the impact output voltage of power-converting device 1 produced as resistance components R and inductance composition L.
General in the vector majorization of motor 3, in the case of the voltage instruction value considering d axle and q axle,
Comprising induction conductivity and magnet synchronous motor, formula 1 substantially described as follows represents R, L like that.
[formula 1]
Vd=R Id-ω·L·Iq
Vq=R Iq+ω·(L·Id+Φ)
Owing to motor 3 is the difference of induction conductivity or magnet synchronous motor, produce a little not
With.Such as inductance composition L is dq axle composition or common leakage inductance composition.It addition, such as magnetic flux Φ becomes
Rotating magnetic flux or Magnet magnetic flux.Although there is the difference of this degree, but essentially become shown in above-mentioned formula 1
Tendency.According to formula 1, in the case of frequencies omega is low, the impact that resistance components R produces is big,
The impact becoming the generation of high-frequency inductor composition is the biggest.
In the harsh environment such as high hot, high corrosion, as motor constant impedance components (resistance,
Inductance) in the case of great changes have taken place, in order to motor speed is kept constant, it is necessary to become with impedance
Change is divided to make the output voltage of power-converting device 1 change accordingly.
Therefore, as described later, power-converting device 1 is being judged as defeated by change in voltage test section 16
In the case of going out the change greatly of voltage, motor 3 suffers high heat etc., thus is judged as creating abnormal omen.
Power-converting device 1, when detecting abnormal omen, reduces the frequency applied to motor 3.Thus, fall
The load of low motor 3, prevents the faults such as motor 3 stopping completely.
Such as, temperature from 30 degree be changed to 150 degree in the case of, resistance value become be of about 1.4 times.
As shown in above-mentioned formula 1, when low speed (such as 10Hz), the resistance value of motor 3
On from power-converting device 1 output voltage produce impact big.In the feelings that the frequency of motor 3 is low
Under condition, the change of resistance value makes output voltage values (VFB) produce great changes.Therefore, with low frequency
In the case of driving motor 3, if be detected that the change of the meansigma methods of output voltage, the most easily detect electricity
The change of motivation constant.
On the other hand, when high speed, according to formula 1, the change of inductance composition L, magnetic
The change of logical composition Φ produces big impact to from power-converting device 1 to the output voltage of motor 3.Example
As in the case of synchronous motor, producing Magnet when becoming high temperature saturated, therefore magnetic flux Φ diminishes, knot
Really output voltage also changes.In the case of induction conductivity, motor structure is made to be subject to due to etchant gas
To impact, when changes such as permeabilities, inductance composition is likely to change.Inductance composition L, magnetic flux composition Φ
Change cause output voltage values (VFB) to change.The change of output voltage values also causes output current value
(IFVB) change.
Fig. 2 represents that in the operating under same frequency, the resistance value of motor 3 increases to 1.4 times from 1 times
In the case of the output voltage values of power-converting device 1 and the analog result of voltage instruction value.Fig. 2 (a1)
Represent resistance value be 1 times in the case of U cross streams magnitude of voltage.Fig. 2 (a2) represents that resistance value increases to
U cross streams magnitude of voltage in the case of 1.4 times.In the case of Fig. 2 (b1) represents that resistance value is 1 times
The voltage instruction value of q axle.Fig. 2 (b2) represents that resistance value increases to the electricity of the q axle in the case of 1.4 times
Pressure command value.
Understand according to simulation, when resistance value increases to 1.4 times, either U cross streams magnitude of voltage or q
The voltage instruction value of axle, magnitude of voltage all increases.It practice, in the environment of harsh, the winding of motor 3
Deterioration, it is taken as that resistance value increases to more than 1.4 times.The change of resistance value is the biggest, and change in voltage is also got over
Greatly.Therefore, the not special sensor such as operating speed sensor, only just can be examined by detection change in voltage
Survey the abnormal omen of motor 3.
Use the flow chart explanation of Fig. 3 for detecting from power-converting device 1 to the output voltage of motor 3
The method etc. of the change of value.Following description is according to the change of the meansigma methods of the output voltage of power-converting device 1
The situation of the abnormal omen of detection motor 3.Can also be replaced it, according to from power-converting device 1
The output change of meansigma methods of electric current, power-converting device 1 in voltage instruction value, current instruction value
Change, the abnormal omen of detection motor 3.
In the output control of Fig. 3 processes, the change of the output voltage of detection power-converting device 1, make electricity
The frequency change of force conversion system 1.
First, manager sets frequency f1 of the object becoming detection change for power-converting device 1
(Hz).Power-converting device 1 monitors whether the frequency provided to motor 3 becomes supervision object frequency f1
(Hz)(S10)。
Power-converting device 1, when confirming frequency and being f1 (Hz) (S10: yes), starts output voltage
The computing (S11) of time average.Power-converting device 1 judges whether the time of arithmetic average value is pre-
Fix time more than T1 (S12).Namely it is decided that the output voltage values whether calculated in scheduled time T1
Meansigma methods.
Scheduled time T1 is set to than producing below the predetermined short time in the load change of motor 3
The generation cycle of the load change of raw burst is long, it is generally desirable to be set as long enough.That is, at the present embodiment
In, the period T1 being used for calculating meansigma methods is set to long, thus as far as possible not by moment as noise
The impact of change in voltage.Such as, scheduled time T1 is set as value long as a few hours～a couple of days.
Scheduled time T1 can also be set as n times of electrical time constant of motor 3.
Power-converting device 1 calculate scheduled period T1 amount output voltage meansigma methods before (S12:
No), repeat step S10, S11.Power-converting device 1 is calculating the output electricity of scheduled time T1 amount
During the meansigma methods pressed (S12: yes), preserve this value (S13).
Then, power-converting device 1 calculates and calculates also in step S11, S12 when the process of last time
Difference Vd between the meansigma methods (meansigma methods of last time) and this meansigma methods that preserve in step s 13
(S14).If the average voltage in the scheduled time T1 that will obtain in a upper process cycle as
First average voltage, the average voltage in the scheduled time T1 that will obtain in the next one process cycle
As the second meansigma methods, then power-converting device 1 obtain the first average voltage and the second average voltage it
Between difference.Frequency when obtaining the first average voltage is identical with frequency when obtaining the second average voltage
Frequency f1.That is, power-converting device 1 is providing the alternating electromotive force of same frequency f1 to motor 3
Situation under, monitor the change of meansigma methods of output voltage.
More than power-converting device 1 judges that whether the change Vd of the meansigma methods of output voltage is as predetermined value Vth
(S15).In the case of the change Vd of the meansigma methods of output voltage is discontented with predetermined value Vth (S15: no),
Return to step S10.
Power-converting device 1 is in the situation that change Vd is more than predetermined value Vth of the meansigma methods of output voltage
Under (S15: yes), it is determined that have an abnormal omen for motor 3, reduce frequency f1 applied to motor 3
Value (S16).By the frequency applied to motor 3 is reduced lower than currency, it is possible to reduce electronic
The rotating thus prevent the situation that motor 3 stops because of fault of machine 3.Such as, by by motor 3
Frequency be reduced to other values bigger than 0, it is possible to reduce the rotation of motor 3 thus lighten the load.Additionally,
According to circumstances, it is also possible to stop motor 3 consciously completely.
Further, power-converting device 1 can also be defeated to manager from user interface part 21 in step s 16
Go out alarm.
According to the present embodiment so constituted, it is not necessary to the motor body under being in harsh and unforgiving environments or its week
While arrange the velocity sensor etc. of special tectonic, it is possible to use the signal from voltage detection department 4, according to defeated
Go out the abnormal omen of voltage change-detection motor 3 in the scheduled time.
Further, according to the present embodiment, in the case of detecting the abnormal omen of motor 3, reduce to electricity
The frequency that motivation 3 applies, therefore, it is possible to the generation of the situation suppressing motor 3 to break down and stopping completely.
Therefore, according to the present embodiment, it is possible to fairly simple structure and the maintenance that improves motor at low cost
The efficiency of operation and reliability.
According to the present embodiment, do not use instantaneous change in voltage, and use the average voltage in the scheduled time,
Therefore, it is possible to get rid of the impact of the temporary transient situation caused because of load change etc. drastically.Can improve abnormal pre-
The accuracy of detection of million.Further, according to the present embodiment, the change of average voltage in the scheduled time is monitored,
Therefore can also be correctly detected as motor 3 constant change the elapsed time and slowly varying not
Good situation.
In addition it is also possible to the meansigma methods extracted out in multiple scheduled time set is averaged comparatively shortly, from
And replace the value of scheduled time T1 is set to a length of a few hours to a couple of days.Can also construct and to be averaged
The meansigma methods of the abundant equalization of overall time length, detects change in voltage.Such as will be set to the scheduled time
10 minutes, some week ten degree several times calculate the average voltage of every 10 minutes, according to these electricity
Flatten the abnormal omen of equal difference detection motor 3.Make frequency during calculating average voltage identical.
[embodiment two]
Use Fig. 4 that the second embodiment is described.It is real that the following each embodiment comprising the present embodiment is equivalent to first
Execute the variation of example.Illustrate centered by different from first embodiment.In the present embodiment, use
The voltage instruction value meansigma methods in the scheduled time used in the inside of power-converting device 1, replace from
The output voltage values that power-converting device 1 applies to motor 3 meansigma methods in the scheduled time.
Fig. 4 represents the overall structure of the electric motor drive system of the present embodiment.In the present embodiment, by electricity
End finger makes change-detection portion 17 detect the voltage instruction value V* of the output valve as voltage command operation portion 13
Change.Speed command correction portion 12, according to the signal from voltage instruction change-detection portion 17, revises speed
Degree instruction.
Additionally, in the present embodiment, it is also possible to replace voltage instruction value V*, and changed by current-order
The change of the current instruction value I* that test section (not shown) detection uses when machine voltage command value V*,
Change erection rate instruction according to current instruction value I*.
The present embodiment so constituted also functions to the action effect identical with first embodiment.Further, in this reality
Execute in example, use the voltage instruction value as control parameter used in the inside of power-converting device 1
The mean variation of (can also be current instruction value), the abnormal omen of detection motor 3, therefore with the
One embodiment is compared and can be simplified structure.That is, in the present embodiment, it is possible to omit voltage detection department 4.
[embodiment three]
Use Fig. 5 and Fig. 6 that the 3rd embodiment is described.In the present embodiment, it is possible to set multiple in order to detect
The abnormal omen of motor 3 and the frequency that uses.
Fig. 5 is the output control performed by power-converting device 1 of the electric motor drive system representing the present embodiment
The flow chart that system processes.Power-converting device 1 judges that whether the frequency exported is as set in advance first
Any one in frequency f1 (Hz) and second frequency f2 (Hz).
Power-converting device 1 when confirm be to monitor any one in object frequency f1, f2 time (S10:
It is), calculate the meansigma methods (S11A) of output voltage under this frequency.Voltage instruction value can also be calculated
Averagely, or calculating current command value is average, replaces the meansigma methods of output voltage.
In the present embodiment, for each frequency in frequency f1, f2, change for calculating meansigma methods
The scheduled time (S12A).Power-converting device 1, in the case of first frequency f1, calculates the scheduled time
Output voltage in T1 average.Power-converting device 1, in the case of second frequency f2, calculates another
Output voltage in scheduled time T2 average.Power-converting device 1 preserves in scheduled time T1, T2
The meansigma methods (S13A) of output voltage.
Power-converting device 1 determines whether to preserve the same frequency that have left more than predetermined time interval Ts
The data (S20) of the meansigma methods under rate.
Explanatory diagram at this reference Fig. 6.Fig. 6 (1), (3), (4) expression are being applied with to motor 3
Average voltage V11, V12, V13 of scheduled time T1 in the case of first frequency f1.Equally,
Fig. 6 (2), (5) illustrate the scheduled time T2's in the case of motor 3 applies second frequency f2
Average voltage V21, V22.In the present embodiment, so to each frequency f1, f2 computing and save
Average voltage in each scheduled period T1, T2.
Further, in the present embodiment, respectively by the scheduled period of same frequency and comparison other each other from
Open the average voltage in the case of more than predetermined time interval Ts to compare.Such as, at Fig. 6
Example in, meansigma methods V11 (Fig. 6 (1)) of the output voltage of frequency f1 is defeated with same frequency f1
The interval delta T 1 gone out between meansigma methods V12 (Fig. 6 (3)) of voltage is more than predetermined time interval Ts,
Therefore comparison other (S20: yes) is become.
Power-converting device 1 calculates difference Vd between average voltage V11 and average voltage V12
(S21).Power-converting device 1 being judged in the case of difference Vd is more than predetermined value Vth (S15A:
It is), it is determined that for being the abnormal omen of motor 3, reduce the frequency applied to motor 3, or to pipe
Reason person gives a warning (S16A).
On the other hand, average voltage V12 (Fig. 6 (3)) and the average voltage in the time adjacent thereto
Interval delta T 1a between value V13 (Fig. 6 (4)) is discontented with predetermined time interval Ts, is not chosen as
Comparison other.
When being conceived to second frequency f2, average voltage V21 (Fig. 6 (2)) and average voltage V22
Interval delta T 2 between (Fig. 6 (5)) is more than predetermined time interval Ts, is therefore chosen as comparison pair
As (S20: yes).Power-converting device 1 calculates between average voltage V21 and average voltage V22
Difference Vd (S21).Power-converting device 1 is in the case of this difference Vd is more than predetermined value Vth
(S15A: yes), it is determined that for detecting the abnormal omen of motor 3, reduces the frequency of motor 3, or
Send alarm (S16A).
The present embodiment so constituted also functions to the action effect as first embodiment.Further, in this reality
Execute in example, under different multiple frequencies, calculate the change of the meansigma methods of output voltage, examine according to this change
Survey the abnormal omen of motor 3.Therefore, even if in the case of frequently switching the frequency used, also can
Enough diagnose motor 3 and prevent fault.
Further, according to the present embodiment, it is spaced apart the predetermined time in the time for obtaining average voltage
In the case of more than the Ts of interval, it is chosen as diagnosis data.Therefore, even if by the scheduled time T1, T2
Be set to short in the case of, it is also possible to be correctly detected the change slowly of motor constant.
[embodiment four]
Use Fig. 7 that the 4th embodiment is described.In the present embodiment, the abnormal omen of motor 3 is being detected
In the case of, after waiting gerentocratic instruction, reduce the frequency of motor 3.
Fig. 7 is the output control performed by power-converting device 1 of the electric motor drive system representing the present embodiment
The flow chart that system processes.Power-converting device 1 is predetermined value Vth when difference Vd learning average voltage
Time above (S15: yes), detect the exception of motor 3 to manager's notice via user interface part 21
The purport (S30) of omen.Such as, user interface part 21 " detects the different of motor to manager's notice
Often omen.Whether reduce driving frequency？" such message.Manager, for this message, can give perhaps
Can or refuse.Or, manager can also provide frequency via user interface part 21 to power-converting device 1
The setting value of rate.
Power-converting device 1, when the instruction of the person that detects Self management (S31: yes), drops according to this instruction
The low frequency (S16) applied to motor 3.Here, in step S31, manager gives about fall
Low-frequency license or the input target frequency lower than current frequency.
The present embodiment so constituted also functions to the action effect identical with first embodiment.Further, in this reality
Executing in example, asked gerentocratic license before reducing the frequency of motor 3, therefore manager can be according to shape
Condition judges to reduce frequency, improves the convenience used.
[embodiment five]
Use Fig. 8 that the 5th embodiment is described.In the present embodiment, can be according to the load of the burst of motor 3
The generation state of variation, is variably set the scheduled time T1 of meansigma methods for calculating output voltage.
Fig. 8 is the flow chart representing and setting the process for the time T1 calculating average voltage.Electric power becomes
Changing device 1 determines whether to detect the noise (S40) produced because of the load change of burst.If be detected that
Noise (S40: yes), then power-converting device 1 calculates noise generation number of times Cn (S41) of time per unit.
The noise of time per unit can also be produced number of times Cn and be referred to as the generation frequency of noise.
More than power-converting device 1 judges that whether noise generation number of times Cn is as the first noise threshold Cth1
(S42).(S42: yes) in the case of number of times Cn is more than the first noise threshold Cth1 is produced at noise,
Scheduled time T1 is set and increases predetermined value (S43) by power-converting device 1.
Power-converting device 1 is when being judged to that noise generation number of times Cn is discontented with the first noise threshold Cth1
(S42: no), it is determined that noise produces whether number of times Cn is more than the second noise threshold Cth2 (S44).
Power-converting device 1 noise produce number of times Cn be more than the second noise threshold Cth2 in the case of (S44:
It is), scheduled time T1 is shortened predetermined value (S45).
So, power-converting device 1 becomes at the generation frequency Cn of the noise caused because of the load change of burst
Time many, scheduled time T1 is set to long, therefore, it is possible to obtain the average voltage that this effect of noise is little.
On the other hand, scheduled time T1, when noise produces frequency Cn reduction, is set by power-converting device 1
Obtain short, therefore, it is possible to quickly detect out the abnormal omen of motor 3.
Additionally, the present invention is not limited to above-mentioned embodiment.To those of ordinary skill in the art,
Various additional, changes etc. can be carried out within the scope of the invention.Such as can be combined as above-mentioned enforcement
Example.Such as can also be by the 3rd～the 5th embodiment and first embodiment and any one group of the second embodiment
Close.It addition, such as can also be by the 5th embodiment and first embodiment, the second embodiment, first embodiment
Combination, the second embodiment and the combination of the 3rd embodiment, the second embodiment and the 3rd with the 3rd embodiment are real
Any one combination executed in the combination of the combination of example, the second embodiment and the 4th embodiment merges.
Description of reference numerals
1: power-converting device；2: cable；3: motor；4: voltage detection department；5: current detecting
Portion；11: speed command operational part；12: speed command correction portion；13: voltage command operation portion；14:
Alternating voltage ordering calculation portion；15:PWM operational part；21: user interface part.
Claims (15)
1. an electric motor drive system, it possesses: motor；And this motor is carried out variable-ratio
The power-converting device driven, it is characterised in that
Above-mentioned power-converting device, by the alternating voltage to above-mentioned motor output preset frequency, drives
State motor,
The output voltage according to above-mentioned motor change in the scheduled time, it is determined that whether above-mentioned output voltage
Carry out the change of more than predetermined value,
In the case of above-mentioned output voltage has carried out the change of more than above-mentioned predetermined value, it is determined that different for detecting
Often omen, reduces the value of above-mentioned preset frequency.
Electric motor drive system the most according to claim 1, it is characterised in that
Above-mentioned power-converting device is by pre-to the output voltage of the above-mentioned motor in first scheduled time and second
The output voltage of the above-mentioned motor in fixing time compares, and thus judges in above-mentioned first scheduled time
Whether the difference between above-mentioned output voltage and the above-mentioned output voltage in above-mentioned second scheduled time is above-mentioned
More than predetermined value, above-mentioned second scheduled time by with above-mentioned first scheduled time in use preset frequency
Identical frequency drives above-mentioned motor.
Electric motor drive system the most according to claim 2, it is characterised in that
Above-mentioned power-converting device judge the above-mentioned output voltage in above-mentioned first scheduled time meansigma methods and
Whether the difference between the meansigma methods of the above-mentioned output voltage in above-mentioned second scheduled time is above-mentioned predetermined value
Above.
Electric motor drive system the most according to claim 3, it is characterised in that
It is set to above-mentioned first scheduled time and above-mentioned second scheduled time become than the load of above-mentioned motor
The generation cycle of the load change of the burst produced below the predetermined short time of disorder of internal organs is long.
Electric motor drive system the most according to claim 4, it is characterised in that
Above-mentioned power-converting device is to each first scheduled time in multiple above-mentioned first scheduled times respectively
The meansigma methods calculating above-mentioned output voltage obtains the first meansigma methods,
And each second scheduled time in multiple above-mentioned second scheduled times is calculated above-mentioned output respectively
The meansigma methods of voltage obtains the second meansigma methods,
Judge the difference between above-mentioned first meansigma methods and above-mentioned second meansigma methods whether as above-mentioned predetermined value with
On.
6. according to the electric motor drive system described in any one in Claims 1 to 5, it is characterised in that
Using the voltage instruction value of generation in above-mentioned power-converting device as the output voltage of above-mentioned motor
Use.
Electric motor drive system the most according to claim 1, it is characterised in that
Above-mentioned power-converting device is being judged to that above-mentioned output voltage has carried out the change of more than above-mentioned predetermined value
In the case of, make the value of above-mentioned preset frequency be reduced to the value bigger than 0.
Electric motor drive system the most according to claim 1, it is characterised in that
Above-mentioned preset frequency is set as, and the resistance value of above-mentioned motor is upper to the contribution ratio of above-mentioned output voltage
Above-mentioned output voltage is contributed big predetermined low frequency by the inductance stating motor.
Electric motor drive system the most according to claim 1, it is characterised in that
Above-mentioned preset frequency includes the first preset frequency and the second preset frequency,
Above-mentioned power-converting device is for each in above-mentioned first preset frequency and above-mentioned second preset frequency
Cymometer counts stating the change of the meansigma methods of the output voltage in the scheduled time in, the first preset frequency, second
Under any one frequency in preset frequency, the meansigma methods of above-mentioned output voltage has carried out more than above-mentioned predetermined value
Change in the case of, it is determined that for detecting abnormal omen, reduce the value of above-mentioned preset frequency.
Electric motor drive system the most according to claim 2, it is characterised in that
The above-mentioned power-converting device time between above-mentioned first scheduled time and above-mentioned second scheduled time
In the case of being spaced apart more than predetermined time interval, by the above-mentioned motor in above-mentioned first scheduled time
Output voltage compares with the output voltage of the above-mentioned motor in above-mentioned second scheduled time.
11. electric motor drive systems according to claim 4, it is characterised in that
Above-mentioned power-converting device is according to the product of the load change of the above-mentioned burst produced in above-mentioned motor
Raw frequency adjusts the above-mentioned scheduled time.
12. electric motor drive systems according to claim 1, it is characterised in that
Above-mentioned power-converting device is being judged to that above-mentioned output voltage has carried out the change of more than above-mentioned predetermined value
In the case of, export this result of determination.
13. 1 kinds of electric motor drive systems, it possesses: motor；And this motor is carried out variable-ratio
The power-converting device driven, it is characterised in that
Above-mentioned power-converting device, by the alternating voltage to above-mentioned motor output preset frequency, drives
State motor,
Motor current value according to the above-mentioned motor driven with constant frequency is in the scheduled time
Change, it is determined that whether above-mentioned motor current value has carried out the change of more than predetermined value,
In the case of above-mentioned motor current value has carried out the change of more than above-mentioned predetermined value, it is determined that for detection
Go out abnormal omen, reduce the value of above-mentioned preset frequency.
The control method of 14. 1 kinds of motor, it uses power-converting device to control the driving of motor, is somebody's turn to do
Power-converting device is by entering above-mentioned motor the alternating voltage of above-mentioned motor output preset frequency
Row variable speed drive, the control method of this motor is characterised by,
Calculate the output voltage of above-mentioned motor in first scheduled time,
Calculate the output voltage of above-mentioned motor in second scheduled time, this second scheduled time by with
The frequency that in above-mentioned first scheduled time, the preset frequency of use is identical drives above-mentioned motor,
Calculate the above-mentioned output voltage in above-mentioned first scheduled time and above-mentioned in above-mentioned second scheduled time
Difference between output voltage,
More than judging that whether above-mentioned difference is as predetermined value,
In the case of above-mentioned difference is more than above-mentioned predetermined value, it is determined that for detecting abnormal omen, in reduction
State the value of preset frequency.
15. 1 kinds of power-converting devices, it is by coming upper the alternating voltage of motor output preset frequency
State motor and carry out variable speed drive, it is characterised in that
The output voltage according to above-mentioned motor change in the scheduled time, it is determined that whether above-mentioned output voltage
Carry out the change of more than predetermined value,
In the case of above-mentioned output voltage has carried out the change of more than above-mentioned predetermined value, it is determined that different for detecting
Often omen, reduces the value of above-mentioned preset frequency.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015032537A JP6472268B2 (en) | 2015-02-23 | 2015-02-23 | Electric motor drive system, electric motor control method, and power converter |
| JP2015-032537 | 2015-02-23 |
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| Publication Number | Publication Date |
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| CN105915148A true CN105915148A (en) | 2016-08-31 |
| CN105915148B CN105915148B (en) | 2018-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610045502.5A Active CN105915148B (en) | 2015-02-23 | 2016-01-22 | Electric motor drive system, the control method of motor and power-converting device |
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| Country | Link |
|---|---|
| JP (1) | JP6472268B2 (en) |
| CN (1) | CN105915148B (en) |
| SA (1) | SA116370226B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104621A (en) * | 2017-04-27 | 2017-08-29 | 上海新时达电气股份有限公司 | The field weakening control method and device of the ac motor speed of service |
| CN112413920A (en) * | 2019-08-21 | 2021-02-26 | 松下知识产权经营株式会社 | Refrigerating machine |
| CN114810548A (en) * | 2021-01-29 | 2022-07-29 | 株式会社丰田自动织机 | Electric compressor |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7047305B2 (en) * | 2017-09-26 | 2022-04-05 | 株式会社富士通ゼネラル | Air conditioner |
| JP6856585B2 (en) * | 2018-08-03 | 2021-04-07 | ファナック株式会社 | Abnormality monitoring device, abnormality monitoring method and control device |
| EP4024700A4 (en) * | 2019-08-30 | 2023-05-17 | Hitachi Industrial Equipment Systems Co., Ltd. | Power converting device and sign diagnostic method used in same |
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| CN102201780A (en) * | 2010-03-24 | 2011-09-28 | 发那科株式会社 | Motor driving apparatus easily analyzable for cause of fault |
| JP2012178906A (en) * | 2011-02-25 | 2012-09-13 | Ntn Corp | Electric vehicle |
| CN103818367A (en) * | 2012-11-16 | 2014-05-28 | 日信工业株式会社 | Vehicle brake hydraulic pressure control apparatus |
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| CN107104621A (en) * | 2017-04-27 | 2017-08-29 | 上海新时达电气股份有限公司 | The field weakening control method and device of the ac motor speed of service |
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| CN112413920A (en) * | 2019-08-21 | 2021-02-26 | 松下知识产权经营株式会社 | Refrigerating machine |
| CN114810548A (en) * | 2021-01-29 | 2022-07-29 | 株式会社丰田自动织机 | Electric compressor |
| CN114810548B (en) * | 2021-01-29 | 2024-03-12 | 株式会社丰田自动织机 | Electric compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| SA116370226B1 (en) | 2020-08-31 |
| CN105915148B (en) | 2018-05-04 |
| JP6472268B2 (en) | 2019-02-20 |
| JP2016158315A (en) | 2016-09-01 |
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