CN105155206B - Roller washing machine and its unbalance detection and device - Google Patents
Roller washing machine and its unbalance detection and device Download PDFInfo
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- CN105155206B CN105155206B CN201510468361.3A CN201510468361A CN105155206B CN 105155206 B CN105155206 B CN 105155206B CN 201510468361 A CN201510468361 A CN 201510468361A CN 105155206 B CN105155206 B CN 105155206B
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F33/00—Control of operations performed in washing machines or washer-dryers
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- D06F2202/065—
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- D06F2212/02—
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- Textile Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
Abstract
The invention belongs to machine testing control technology field of doing washing, there is provided a kind of roller washing machine and its unbalance detection and device, when roller is at the uniform velocity operated according to low speed, drum rotation speed is detected and the first fluctuation of speed value is obtained, then in cylinder constant accelerated service, the second fluctuation of speed value of roller is obtained in real time, judge whether the difference of the first fluctuation of speed value and the second fluctuation of speed value is more than default uneven threshold values, if difference is more than the uneven threshold values, then judge that dynamic unbalance occurs in roller, otherwise judge that roller does not occur dynamic unbalance, therefore the present invention need not carry out uneven detection using sensor, reduce cost and detection difficulty, and avoid when roller runs at high speed carry out dynamic unbalance detection make the problem of damaged in collision occurs in mechanical part.
Description
Technical field
The invention belongs to machine testing control technology field of doing washing, more particularly to roller washing machine and its unbalance detection
And device.
Background technology
In roller washing machine, when the roller that variable-frequency motor is driven is uneven, the rotating speed of variable-frequency motor is higher, then is
The vibration of system and noise will be bigger, so that the service life of roller washing machine can be reduced.Variable-frequency motor has laod unbalance
Function is detected, can be by adjusting rotating speed or the non-equilibrium state progress to load when finding that load (such as roller) is uneven
Change, to reach the vibration of reduction system and the purpose of noise.
Prior art provides following two unbalance detections：
(1) detected by using sensor to whether roller balances, but sensor cost it is higher and be not easy to peace
Dress, so as to cause detection difficulty big.
(2) by judging that roller is according to the rotating speed or torque of variable-frequency motor in low speed operation phase and high-speed cruising stage
No balance；However, this method is carried out in the low-speed running stage (motor is traveled at the uniform speed according to fixed rotary speed) to roller
Static unbalance can not realize that dynamic unbalance is detected simultaneously when detecting, and because roller in the stage of running at high speed is to run at high speed
, dynamic unbalance detection is carried out during running at high speed can make the mechanical part of washing machine internal collide and cause to wash
Clothing machine is damaged.
In summary, prior art has cost height, detection difficulty can not enter action to roller greatly, in the low speed operation phase
State imbalance is detected and dynamic unbalance detection is carried out in the high-speed cruising stage easily touches the mechanical part of washing machine internal
The problem of damage does harm to.
The content of the invention
It is an object of the invention to provide a kind of roller washing machine and its unbalance detection and device, it is intended to solves existing
Have that cost present in technology is high, detection difficulty is big, dynamic unbalance detection can not be carried out to roller in the low-speed running stage and
Dynamic unbalance detection is carried out in the stage that runs at high speed easily makes the problem of impaction lesion occurs in the mechanical part of washing machine internal.
The present invention is achieved in that a kind of roller washing machine unbalance detection, and the roller washing machine is uneven
Detection method comprises the following steps：
A. the rotating speed of the roller is detected when roller is at the uniform velocity operated and obtains the first fluctuation of speed value；
B. during the roller carries out accelerated service according to constant acceleration, the second of the roller is obtained in real time
Fluctuation of speed value；
C. judge whether the difference of first fluctuation of speed value and second fluctuation of speed value is more than default imbalance
Threshold values, if the difference is more than the default uneven threshold values, judges that dynamic unbalance occurs in the roller, otherwise judges institute
State roller and do not occur dynamic unbalance.
Present invention also offers a kind of uneven detection means of roller washing machine, the roller washing machine imbalance detection dress
Put including：
First fluctuation of speed acquisition module, the second fluctuation of speed acquisition module and dynamic unbalance judge module；
First fluctuation of speed acquisition module is used to detect the rotating speed of the roller when roller is at the uniform velocity operated
And obtain the first fluctuation of speed value；
Second fluctuation of speed acquisition module is used for the mistake for carrying out accelerated service according to constant acceleration in the roller
Cheng Zhong, obtains the second fluctuation of speed value of the roller in real time；
The dynamic unbalance judge module judges the difference of first fluctuation of speed value and second fluctuation of speed value
Whether value is more than default uneven threshold values, if the difference is more than the uneven threshold values, judges that dynamic occurs in the roller
Imbalance, otherwise judges that the roller does not occur dynamic unbalance.
Present invention also offers a kind of roller washing machine, it includes roller and above-mentioned roller washing machine imbalance detection
Device.
During uneven detection is carried out to roller washing machine, the present invention is at the uniform velocity operated in roller according to low speed
When, the rotating speed of roller is detected and the first fluctuation of speed value is obtained, is then accelerated in roller according to constant acceleration
During operating, the second fluctuation of speed value of roller is obtained in real time, and according to first fluctuation of speed value and second fluctuation of speed
Value judges whether roller dynamic unbalance occurs, if so, then control roller stops accelerated service, and judges trembling for roller executed
Whether scattered number of operations is more than preset times value, is, then controls roller to shut down, no, then controls roller to perform and shake loose operation
And low-speed running is then carried out, and static unbalance detection is carried out to it in roller low-speed running, it need not adopt in the process
Uneven detection is carried out with sensor, cost and detection difficulty is reduced, and can enter in roller low-speed running and accelerated service
Mobile state imbalance detection, it is to avoid carry out dynamic unbalance detection when roller runs at high speed and cause mechanical part to touch
The problem of damage does harm to.
Brief description of the drawings
Fig. 1 is the implementation process figure of roller washing machine unbalance detection provided in an embodiment of the present invention；
Fig. 2 is another implementation process figure of roller washing machine unbalance detection provided in an embodiment of the present invention；
Fig. 3 is another implementation process figure of roller washing machine unbalance detection provided in an embodiment of the present invention；
Fig. 4 is the Parameters variation waveform involved by roller washing machine unbalance detection provided in an embodiment of the present invention
Figure；
Fig. 5 is the Parameters variation waveform involved by roller washing machine unbalance detection provided in an embodiment of the present invention
Figure；
Fig. 6 is the Parameters variation waveform involved by roller washing machine unbalance detection provided in an embodiment of the present invention
Figure；
Fig. 7 is the Parameters variation waveform involved by roller washing machine unbalance detection provided in an embodiment of the present invention
Figure；
Fig. 8 is the Parameters variation waveform involved by roller washing machine unbalance detection provided in an embodiment of the present invention
Figure；
Fig. 9 is the Parameters variation waveform involved by roller washing machine unbalance detection provided in an embodiment of the present invention
Figure；
Figure 10 is the structure chart of the uneven detection means of roller washing machine provided in an embodiment of the present invention；
Figure 11 is the structure chart of the uneven detection means of another roller washing machine provided in an embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 shows the implementation process of roller washing machine unbalance detection provided in an embodiment of the present invention, in order to just
In explanation, the part related to the embodiment of the present invention is illustrate only, details are as follows：
In step sl, the rotating speed of the roller is detected when roller is at the uniform velocity operated and obtains first fluctuation of speed
Value.
Following steps are specifically included in above-mentioned steps S1：
Rotate a circle and the rotating speed of roller is detected in the time in roller, and obtain the maximum and minimum of actual speed
Value；
The first fluctuation of speed value is obtained after the maximum of actual speed and minimum value are carried out into difference operation.
Herein it should be noted that：The speed trajectory of washing machine drum carries out Accelerating running again first to be traveled at the uniform speed,
For example, when the rotary speed for setting at the uniform velocity section roller is 90rpm (rev/min), rotary speed of the roller at the uniform velocity section is detected, and
Further record obtains actual speed and actual speed is ranked up to obtain maximum and most in the fluctuation of speed of at the uniform velocity section
Small value.
In step s 2, during roller carries out accelerated service according to constant acceleration, the of roller is obtained in real time
Two fluctuation of speed values.
It is specially the step of the second fluctuation of speed value of real-time acquisition roller in above-mentioned steps S2：
Rotate a circle and the rotating speed of roller is detected in the time in roller, and obtain the maximum and minimum of actual speed
Value；
The second fluctuation of speed value is obtained after the maximum of actual speed and minimum value are carried out into difference operation.
Herein it should be noted that：Washing machine drum is carrying out Accelerating running, detects rotary speed of the roller in accelerating sections,
Go forward side by side the fluctuation of speed of the one-step recording in accelerating sections, obtain actual speed and actual speed is ranked up with obtain maximum and
Minimum value.
In step s3, judge whether the difference of the first fluctuation of speed value and the second fluctuation of speed value is more than default imbalance
Threshold values, is that then execution step S4, no, then performs step S10.
Herein it should be noted that：Above-mentioned default uneven threshold values refers to set in advance for weighing whether roller goes out
One fluctuation of speed reference value of existing dynamic unbalance.
In step s 4, judge that dynamic unbalance occurs in roller.
In step slo, judge that roller does not occur dynamic unbalance.
The roller is controlled to remain in operation according to default washing procedure after step S10.Wherein, default washing procedure herein
It can be the high speed dewatering operation that roller washing machine is performed required for completing after the washing operation to clothing.
Further, as shown in Fig. 2 further comprising the steps of after step S4：
In step s 5, judge roller executed shakes loose whether number of operations is more than preset times value, is then to perform step
Rapid S6, it is no, then perform step S7.
In step s 6, control roller shuts down.
In the step s 7, control roller, which performs to shake loose, operates and then carries out low-speed running, and returns to execution step S1.
Wherein, shake loose operation and refer to that roller is shaken under the control of motor so that what is accommodated inside it is currently washed
The dispersed operation of article, shaking loose operation by execution can make roller restore balance；Preset times value refers to set in advance
Number of operations is shaken loose, it, which is used to weigh performed by roller washing machine, shakes loose whether operation has reached defined number of times, if it is,
Operation can not be shaken loose to solve, it is necessary to shut down to avoid laundry drum by execution by then showing the dynamic unbalance of roller
Part in machine is damaged；If it is not, then controllable roller, which is performed, shakes loose operation so that roller restores balance.
Further, as shown in figure 3, for further comprising the steps of before above-mentioned steps S1：
Step S8. carries out static unbalance detection when roller is at the uniform velocity operated to roller；
Step S9. judges that roller static unbalance, whether less than default uneven threshold values, is that then execution step S1, no, then
Perform step S5.
Wherein, during roller low-speed running, need first to carry out static unbalance detection to roller, if rolling
There is static unbalance in cylinder, then can not carry out dynamic unbalance detection, so needing just hold when roller is in static balancing
Row step S1.The above-mentioned mentioned static unbalance that carried out to roller detects same as the prior art, therefore repeats no more.
After provided with above-mentioned steps S8 and S9, wherein the execution of control roller shakes loose operation and then carried out in the step s 7
After low-speed running, return and perform step S8.
Above-mentioned roller washing machine unbalance detection is described further below in conjunction with instantiation：
Assuming that rotating speed of the roller in low-speed running is 90rpm (rev/min), acceleration fortune is being carried out according to constant acceleration
It is to accelerate to 220rpm from 90rpm during turning.When roller is according to 90rpm low-speed runnings, if roller static unbalance
Not less than default uneven threshold values, then the rotating speed turned around can be revolved to roller and detected, and turned according to detected reality
The maximum and minimum value of speed are to obtain the first fluctuation of speed value A.Accelerated in roller according to constant acceleration from 90rpm
During 220rpm, the second fluctuation of speed value of roller is obtained in real time, is specifically turn for revolving turn around to roller when rotated
Speed carries out detection and obtains actual speed, and is worth to the second rotating speed ripple according to the maximum and minimum of detected actual speed
Dynamic value B, then judges whether roller dynamic unbalance occurs, this sentences according to the first fluctuation of speed value A and the second fluctuation of speed value B
Difference operation is asked to obtain fluctuation of speed difference C (i.e. C=the second fluctuation of speed value B and the first fluctuation of speed value A progress during disconnected process
B-A), and judge whether fluctuation of speed difference C is more than default uneven threshold X, if it is, it is uneven to judge that dynamic occurs in roller
Weighing apparatus, if it is not, then judging that roller does not occur dynamic unbalance.When dynamic unbalance occurs in roller, control roller stops accelerating
Operating, so that damaged in collision occurs in the mechanical part mitigated in washing machine, and judges that the number of operations that shakes loose of executed is simultaneously
It is no to be more than preset times value Y, if it is, showing that roller can not restore balance, it is necessary to control at once by shaking loose operation
Roller shuts down, to avoid the mechanical part in washing machine from occurring further gouging abrasion；If it is not, then controllable roller
Execution, which shakes loose, to be operated so that roller restores balance, and continues in roller low-speed running to roller progress static unbalance detection.
When roller dynamic unbalance does not occur, roller is controlled to enter according to 220rpm according to default washing procedure (such as high speed dewatering operation)
Row runs at high speed to continue dehydrating operations to clothes.
In addition, when carrying out static unbalance detection to roller, if roller static unbalance exceedes default uneven threshold
Value, then judge executed shakes loose whether number of operations is more than preset times value Y, if it is, showing that roller can not pass through
Shake loose operation and restore balance, it is necessary to which control roller shuts down at once, to avoid the mechanical part in washing machine from entering one
The gouging abrasion of step；Operated if it is not, then controllable roller performs to shake loose so that roller restores balance, and in roller low-speed running
Shi Jixu carries out static unbalance detection to roller.
By using above-mentioned roller washing machine unbalance detection, it can enter in roller low-speed running and accelerated service
Mobile state imbalance detection, it is to avoid carry out dynamic unbalance detection when roller runs at high speed and cause mechanical part to touch
The problem of damage does harm to.In actual applications, in the embodiment of rotating speed is fluctuated in the first acquisition second, roller is carried out uneven
During weighing apparatus detection, following three kinds of situations are generally divided into：
(1) roller meets static balancing and dynamic equilibrium simultaneously；Fig. 4 is under empty barrel balanced load situation, roller accelerated
The waveform of fluctuation of speed information and dynamic unbalance amount after actual speed, processing in journey, with the increase of rotating speed, rotating speed ripple
Dynamic change is smaller, and dynamic unbalance amount does not reach the dynamic unbalance threshold values of setting, can continue to accelerate to high regime, test knot
Fruit is consistent with expected design.
(2) roller is in dynamic unbalance state；Fig. 5 be roller accelerator in actual speed, processing after rotating speed ripple
Dynamic information, the waveform of dynamic unbalance amount.Become larger in the fluctuation of speed of accelerating sections with the increase of speed, speed increases postwave
It is dynamic to be more than at the uniform velocity section, threshold values of the dynamic unbalance amount higher than setting, it is not possible to continue to accelerate to high regime, it is necessary to carry out after stopping
Operation is shaken loose, test result is consistent with expected design.
(3) roller is in static unbalance load condition；As shown in fig. 6, speed command in roller accelerator, in real time
The waveform of rotating speed, dynamic unbalance amount, with the increase of rotating speed, the fluctuation of speed more at the uniform velocity section diminishes, and dynamic unbalance amount is not up to
To the dynamic unbalance threshold values of setting, it can continue to accelerate to high regime, test result is consistent with expected design.
In actual applications, in the embodiment of rotating speed is fluctuated in second of acquisition second, uneven inspection is carried out to roller
During survey, following three kinds of situations are generally divided into：
(1) roller meets static balancing and dynamic equilibrium simultaneously；Fig. 7 is under empty barrel balanced load situation, roller accelerated
Fluctuation of speed information, the waveform of dynamic unbalance amount after actual speed, processing in journey, with the increase of rotating speed, the fluctuation of speed
Change is smaller, and dynamic unbalance amount does not reach the dynamic unbalance threshold values of setting, can continue to accelerate to high regime, test result
It is consistent with expected design.
(2) roller is in dynamic unbalance state；Fig. 8 is has under dynamic unbalance state, in roller accelerator
Fluctuation of speed information, the waveform of dynamic unbalance amount after actual speed, processing.Accelerating sections the fluctuation of speed with speed increase
Become larger, fluctuation is more than at the uniform velocity section, threshold values of the dynamic unbalance amount higher than setting, it is not possible to continue to accelerate to after speed increases
High regime after stopping, it is necessary to carry out shaking loose operation, test result is consistent with expected design.
(3) roller is in static unbalance load condition；Fig. 9 is under empty barrel static unbalance load condition, roller accelerates
During speed command, real-time rotating speed, the waveform of dynamic unbalance amount, with the increase of rotating speed, the fluctuation of speed more at the uniform velocity section
Diminish, dynamic unbalance amount does not reach the dynamic unbalance threshold values of setting, can continue to accelerate to high regime.Test result is with setting
Meter is expected consistent.
In summary, during uneven detection is carried out to roller washing machine, the embodiment of the present invention roller according to
When low speed carries out at the uniform velocity operating and static balancing, the rotating speed of roller is detected and the first fluctuation of speed value, Ran Hou is obtained
When roller carries out accelerated service according to constant acceleration, the second fluctuation of speed value of roller is obtained in real time, and according to described first
Fluctuation of speed value and second fluctuation of speed value judge whether roller dynamic unbalance occurs, if so, then control roller stops adding
Speed operating, and judge roller executed shake loose number of operations whether be more than preset times value, be, then control roller stop fortune
Turn, it is no, then control roller to perform and shake loose operation and then carry out low-speed running, and static state is carried out to it in roller low-speed running
Imbalance detection, need not carry out uneven detection using sensor in the process, reduce cost and detection difficulty, and can be
Dynamic unbalance detection is carried out when roller low-speed running and accelerated service, it is to avoid enter when roller runs at high speed Mobile state uneven
Weighing apparatus detects and causes the problem of impaction lesion occurs in mechanical part.
Based on above-mentioned roller washing machine unbalance detection, it is uneven that the embodiment of the present invention additionally provides roller washing machine
Weigh detection means, as shown in Figure 10, it include the first fluctuation of speed acquisition module 200, the second fluctuation of speed acquisition module 600 with
And dynamic unbalance judge module 300.
First fluctuation of speed acquisition module 200 is used to the rotating speed of roller is detected and obtained when roller is at the uniform velocity operated
First fluctuation of speed value.
Second fluctuation of speed acquisition module 600 is used for during roller carries out accelerated service according to constant acceleration,
The second fluctuation of speed value of the roller is obtained in real time.
Dynamic unbalance judge module 300 is used for the difference for judging the first fluctuation of speed value and second fluctuation of speed value
Whether it is more than default uneven threshold values, if difference is more than uneven threshold values, judges that dynamic unbalance occurs in roller, otherwise judge
Roller does not occur dynamic unbalance.
Further, the first fluctuation of speed acquisition module 200 is detected to the rotating speed of roller and obtains the first rotating speed ripple
The process of dynamic value is specially：
Rotate a circle and the rotating speed of roller is detected in the time in roller, and obtain the maximum and minimum of actual speed
Value.
The first fluctuation of speed value is obtained after the maximum of actual speed and minimum value are carried out into difference operation.
Further, the second fluctuation of speed acquisition module 600 obtains the process tool of the second fluctuation of speed value of roller in real time
Body is：
Rotate a circle and the rotating speed of roller is detected in the time in roller, and obtain the maximum and minimum of actual speed
Value.
The second fluctuation of speed value is obtained after the maximum of actual speed and minimum value are carried out into difference operation.
Further, as shown in figure 11, the uneven detection means of roller washing machine also includes shaking loose number of times judge module
500, shake loose number of times judge module 500 be used for judge roller executed shake loose number of operations whether be more than preset times value；When
Judged result is when being, control roller shuts down；When judged result is no, control roller performs to shake loose and operates and carry out low
Speed operating, and drive the first fluctuation of speed acquisition module 200 to work.
In addition, roller washing machine imbalance detection means also includes static unbalance detection module 100, static unbalance inspection
Surveying module 100 is used to detect roller static unbalance more than default uneven threshold values, then is sentenced by shaking loose number of times judge module 500
Disconnected roller executed shakes loose whether number of operations is more than preset times value；When judged result is to be, roller control module 400
Control roller shuts down；When judged result is no, the control roller of roller control module 400, which performs to shake loose, to operate and carries out low
Speed operating, and drive static unbalance detection module 100 to work.
During uneven detection is carried out to roller washing machine, by the first fluctuation of speed acquisition module roller according to
When low speed is at the uniform velocity operated, the rotating speed of roller is detected and the first fluctuation of speed value is obtained, then by dynamic unbalance
Judge module obtains the second fluctuation of speed value of roller, and root in real time when roller carries out accelerated service according to constant acceleration
Judge whether roller dynamic unbalance occurs according to first fluctuation of speed value and second fluctuation of speed value, if so, then roller
Control module control roller stops accelerated service, and shakes loose number of operations by shake loose that number of times judge module judges roller executed
Whether it is more than preset times value, is, then roller control module control roller shuts down, no, then roller control module control rolling
Cylinder, which performs to shake loose, operates and carries out low-speed running, and the detection module work of driving static unbalance, need not use in the process
Sensor carries out uneven detection, reduces cost and detection difficulty, and can be carried out in roller low-speed running and accelerated service
Dynamic unbalance is detected, it is to avoid is carried out dynamic unbalance detection when roller runs at high speed and is caused mechanical part to collide
The problem of infringement.
Based on the uneven detection means of above-mentioned roller washing machine, the embodiment of the present invention additionally provides a kind of laundry drum
Machine, it includes roller and the uneven detection means of above-mentioned roller washing machine.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (3)
1. a kind of roller washing machine unbalance detection, it is characterised in that the roller washing machine unbalance detection bag
Include following steps：
A. the rotating speed of the roller is detected when roller is at the uniform velocity operated and obtains the first fluctuation of speed value；
B. during the roller carries out accelerated service according to constant acceleration, the second rotating speed of the roller is obtained in real time
Undulating value；
C. judge whether the difference of first fluctuation of speed value and second fluctuation of speed value is more than default uneven threshold values,
If the difference is more than the default uneven threshold values, judges that dynamic unbalance occurs in the roller, otherwise judge the rolling
Cylinder does not occur dynamic unbalance；
The step A specifically includes following steps：
Rotate a circle and the rotating speed of the roller is detected in the time in the roller, and obtain the maximum of the actual speed
Value and minimum value；
The first fluctuation of speed value is obtained after the maximum of the actual speed and minimum value are carried out into difference operation；
The step B comprises the following steps：
Rotate a circle and the rotating speed of the roller is detected in the time in the roller, and obtain the maximum of the actual speed
Value and minimum value；
The second fluctuation of speed value is obtained after the maximum of the actual speed and minimum value are carried out into difference operation.
2. a kind of uneven detection means of roller washing machine, it is characterised in that the uneven detection means bag of the roller washing machine
Include：
First fluctuation of speed acquisition module, the second fluctuation of speed acquisition module and dynamic unbalance judge module；
First fluctuation of speed acquisition module is used to the rotating speed of the roller is detected and obtained when roller is at the uniform velocity operated
Take the first fluctuation of speed value；
Second fluctuation of speed acquisition module is used for during the roller carries out accelerated service according to constant acceleration,
The second fluctuation of speed value of the roller is obtained in real time；
The dynamic unbalance judge module is used for the difference for judging first fluctuation of speed value and second fluctuation of speed value
Whether value is more than default uneven threshold values, if the difference is more than the uneven threshold values, judges that dynamic occurs in the roller
Imbalance, otherwise judges that the roller does not occur dynamic unbalance；
First fluctuation of speed acquisition module is detected to the rotating speed of the roller and obtains the mistake of the first fluctuation of speed value
Journey is specially：
Rotate a circle and the rotating speed of the roller is detected in the time in the roller, and obtain the maximum of the actual speed
Value and minimum value；
The first fluctuation of speed value is obtained after the maximum of the actual speed and minimum value are carried out into difference operation；
The process that second fluctuation of speed acquisition module obtains the second fluctuation of speed value of the roller in real time is specially：
Rotate a circle and the rotating speed of the roller is detected in the time in the roller, and obtain the maximum of the actual speed
Value and minimum value；
The second fluctuation of speed value is obtained after the maximum of the actual speed and minimum value are carried out into difference operation.
3. a kind of roller washing machine, including roller, it is characterised in that the roller washing machine also includes as claimed in claim 2
The uneven detection means of roller washing machine.
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| CN201510468361.3A CN105155206B (en) | 2015-07-31 | 2015-07-31 | Roller washing machine and its unbalance detection and device |
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| CN104452187A (en) * | 2014-11-21 | 2015-03-25 | 广东威灵电机制造有限公司 | Roller washing machine and unbalance detection method and device thereof |
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| CN1240848A (en) * | 1998-07-02 | 2000-01-12 | 三星电子株式会社 | Method for detecting unbalanced drum in drum type washing machine |
| US6640372B2 (en) * | 2000-06-26 | 2003-11-04 | Whirlpool Corporation | Method and apparatus for detecting load unbalance in an appliance |
| JP4941319B2 (en) * | 2008-01-17 | 2012-05-30 | パナソニック株式会社 | Washing machine, drum rotation speed control method and program |
| KR20110048348A (en) * | 2009-11-02 | 2011-05-11 | 엘지전자 주식회사 | Method for washing and washing machine |
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