CN1204409C - Induction motor overload detector and overload detecting method - Google Patents
Induction motor overload detector and overload detecting method Download PDFInfo
- Publication number
- CN1204409C CN1204409C CNB011439858A CN01143985A CN1204409C CN 1204409 C CN1204409 C CN 1204409C CN B011439858 A CNB011439858 A CN B011439858A CN 01143985 A CN01143985 A CN 01143985A CN 1204409 C CN1204409 C CN 1204409C
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- induction motor
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- motor
- window shutter
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Abstract
The present invention provided an apparatus for detecting overload in an induction motor, the apparatus of which is simply constituted, at a low cost and is reliable, and to provide a method for the apparatus. The apparatus and the method for detecting overloads in an induction motor involve an induction motor 10, including a phase advance capacitor C and a drive circuit 22 for driving the induction motor 10. The apparatus and the method also involve a voltage-detecting means 24 for detecting the voltage of the induction motor 10 and a voltage fluctuation detecting means 30, that detects prescribed fluctuations in a voltage detected by the voltage- detecting means 24. The voltage-detecting means 24 is designed to detect the voltage EL across the winding of the induction motor 10 or the voltage EC across the phase advance capacitor C.
Description
Technical field
The present invention relates to induction motor with overload detection and overload detection method, can detect the overload that is added to induction motor and carry out predetermined protection operation.
Background technology
Usually, be added to the commonsense method of the overload of induction motor, the existing method that detects overload by the increment current that flows through induction motor in the detection when adding that overload is slack-off of the rotating speed of induction motor as detection.In addition, also has the rotating speed by detecting induction motor and become unusual at rotating speed and judge that overload detects the method for overload when slow.
Simultaneously, the switching used in blinds motor as the stormproof louvre window (shutter) that is used as dwelling house has a kind of minor diameter induction motor, and its drive current has little variation with respect to rotation speed change.Yet, because the variation of drive current is little in this induction motor, so can detect overload by the monitoring driving electric current.Therefore, must detect rotating speed, perhaps other mechanical detection methods are necessary.For example, as detecting the mechanical means that electricity drives the abnormal conditions of window shutter, in 9-310573 Jap.P. public publication, disclosed a kind of detection method.According to this detection method, when running into foreign matter during window shutter puts down, the hinge (link) that is located at roll-type window or door one side relies on the power of clamping foreign matter outwards to be protruded.Then, hinge makes along the set closing of contact of the guide rail of this side of window shutter (guide), detects abnormal conditions, and stops to put down window shutter or start reverse operating.
In addition, in the boundary up and down (limit) of window shutter, also must detect them and stop motor.For this reason, limited switching is located at boundary place up and down respectively, thereby limited switching when having reached these two boundaries, the end of window shutter stops driving motor.Also having a kind of method is the corner of machinery or electrical motor reel, and stops motor at a setting value place.
According to above-mentioned routine techniques, when detecting the overload of the little motor of drive current variations, must monitor the rotating speed of motor or utilize above-mentioned mechanical detection method.This makes detecting unit not only complexity but also costliness.In addition, because these detection methods need complicated structure, so in order to increase the reliability of equipment, this equipment becomes more expensive.
Stop at the place of boundary up and down of window shutter having similar problem under the situation of motor.
Summary of the invention
Constituted the present invention at above-mentioned routine techniques problem.Therefore, an object of the present invention is to provide a kind of induction motor, have the low high simple structure of reliability of cost with overload detection and overload detection method.
In order to realize above purpose, according to one aspect of the present invention, a kind of induction motor overload detection is provided, comprise the induction motor with phase advance capacitor and the driving circuit of driven induction motor, overload detection also comprises the voltage check device of the voltage that is used for detecting induction motor and is used to detect the voltage that voltage check device detects whether the change in voltage pick-up unit that predetermined voltage changes takes place.
Best, voltage check device detects the winding voltage of induction motor or the both end voltage of phase advance capacitor.In addition, preferably the induction motor opening and closing are installed in the lath (slat) of the window shutter on the buildings, and induction motor (concentrically) coaxially is arranged in the reel of lath.Best, the drive current of induction motor has little variation with respect to change in rotational speed.
In addition, according to a second aspect of the present invention, a kind of induction motor overload detection method is provided, comprise the induction motor with phase advance capacitor and the driving circuit of driven induction motor, overload detection method also comprises the voltage check device (it comprises the rectifier that is used for the voltage of induction motor is carried out half-wave rectification) of the voltage that is provided for detecting induction motor and is used to detect peak detector through the crest voltage of the half-wave of rectification, the signal that the crest voltage pick-up unit is obtained carries out digital processing, and stops induction motor by controller when crest voltage generation predetermined voltage changes.Wherein, changed predetermined value or more at the mean value of the winding voltage of predetermined period internal induction motor,, then ignored the variation of winding voltage if supply voltage also changes, at the supply voltage no change but winding voltage when having changed judges that induction motor transships.
Best, the driving torque of induction motor is such, thus during the open operation of window shutter with the nominal torque driven induction motor, during the shutoff operation of window shutter, come driven induction motor with the value that is lower than nominal torque.
Summary of drawings
Fig. 1 is the synoptic diagram that the induction motor overload detection in the one embodiment of the invention is shown.
Fig. 2 is the synoptic diagram that the motor drive circuit of induction motor overload detection in the present embodiment is shown.
Fig. 3 is the figure of output that the half-wave rectifier circuit of the voltage-level detector in the present embodiment is shown.
Fig. 4 is the figure that the motor characteristic of induction motor overload detection in the present embodiment is shown.
Better embodiment of the present invention
Below with reference to description of drawings one embodiment of the present of invention.Fig. 1 is figure that one embodiment of the invention is shown to 4 Fig. 4.The motor 10 that is used as the induction motor of present embodiment is used for the window shutters 12 such as stormproof louvre window that opening and closing resemble dwelling house shown in Figure 1.Window shutter 12 is arranged on the outside of dwelling house sliding sash analogs such as (sliding sash).Window shutter 12 has along a pair of lifting to be opened and closed lath 16 with the above-below direction of guide rail 14 and 15.At the upside of window shutter 12, on dwelling house, be fixedly provided with the containing section 18 of taking in them by coiling lath 16.In containing section 18, be provided with the reel that can move forward and backward 20 of the lath 16 that is used to reel.
As shown in Figure 2, the wiring from commercially available power supply 25 is connected between contact CW and the CCW via switch SW (as the wiring of linking motor 10).Contact CW and CCW be by switch SW being rotated in of motor 10 is rotated in the forward and reverse rotation between the contact point that switches.
Under situation shown in Figure 2, the voltage input voltage detector 24 of the winding L 2 of motor drive circuit 22.Voltage-level detector 24 comprises detection resistor R 1 and half-wave rectifier circuit 34, also is provided with the controller 30 that is transfused to from the output of half-wave rectifier circuit 34.Controller 30 is provided with A/D converter 32, to change carry out A/D from the input of half-wave rectifier circuit 34.
In Fig. 2, suppose that the lath 16 when motor (, when switch SW links to each other with contact CW) window shutter 12 when being rotated in the forward puts down, when window shutter 12 unlatchings, switch SW links to each other with contact CCW.With the changer (not shown) voltage of winding L 1 is added to half-wave rectifier circuit 34.
The operation of the induction motor overload detection of present embodiment is as follows.As shown in Figure 3, controller 30 digitally reads voltage through the ripple of voltage-level detector 24 half-wave rectification with preset sampling frequency.The crest voltage of these half-waves of controller 30 storage is monitored the variation of each half-wave crest voltage usually.
When foreign matter 26 window shutter 12 open or shutoff operation during run into lath 16 the lower end, lath 16 reached window shutter 12 on or the lower end, then reduce the rotating speed of motor 10 as shown in Figure 4 suddenly.Though the variation of motor current is minimum, the AC voltage peak of the voltage EL of the both end voltage EC of phase advance capacitor C or winding L 1 or L2 obviously reduces.As a result, the peak value of half-wave rectification voltage EL is fully reduced.The mean value of these peak values has changed predetermined value or more for a long time, motor 10 is in overload in predetermined period of time.In the case, lath 16 is run into foreign matter 26, and perhaps lath 16 is in the upper end or the lower end of window shutter 12.Therefore, controller 30 cut-off switch SW, and stop the driving of motor 10.
Consider the supply voltage and the frequency of commercially available power supply 25, set the threshold value of judging overload according to the application of window shutter 12 or the size of window shutter 12.When detecting overload, also consider the change in voltage of commercially available power supply 25.The mean value of voltage EL has changed predetermined value or more in predetermined period of time, for example also correspondingly change to the mxm. of supply voltage or the mean value of mxm. if wait in the supply voltage predetermined time cycle, then the variation of voltage EL can be ignored in the case.On the other hand, when voltage EL changes, but supply voltage judges that then overload is added on the window shutter when not changing.Along with the change in voltage of power supply 25, the instantaneous voltage drop that takes place when existing air conditioner to connect, the instantaneous power-down that takes place when perhaps the relay circuit of transformer is switched.In the case, controller 30 can be ignored this phenomenon when carrying out the judgement of relevant overload.Configuration thus can be the threshold setting that detects overload low relatively value, and can high sensitivity carry out overload detection.
Can so dispose the driving torque of motor 10, thus during the open operation of transformer 12 with nominal torque driving motor 10, and during shutoff operation with the value driving motor 10 lower than nominal torque.Best, the driving torque of this moment is the required minimum torque of mobile lath 16.For example, in order to regulate torque, can change torque at the resistance that an available switch during window shutter 12 shutoff operations makes it to have between commercially available power supply 25 and the motor 10.Also can regulate torque by the added voltage of gating regulating and controlling of triac.Also can regulate torque by the electric capacity of conversion phase advance capacitor C.In order to change electric capacity, the switch that is linked with the shutoff operation with window shutter 12 makes another capacitor connect with phase advance capacitor C.This torque after the lath 16 of window shutter 12 puts down through descending after the predetermined short time.
By above configuration, even when lath 16 is met people or object during the shutoff operation of window shutter 12, also resistance that can be little and high reliability stop motor 10.
According to the induction motor overload detection of present embodiment winding L 1 and the voltage of the L2 overload that detects motor 10 by detecting motor 10.Therefore, though at the drive current of motor 10 no matter the rotating speed of motor 10 and when constant relatively, also can detect overload safely.Especially, when overload detection being applied to the motor 10 of opening and closing window shutter 12 usefulness,, also can stop driving motor 10 safely even window shutter 12 is run into foreign matter 26 or man-hour during unlatching or shutoff operation.By the accurate operation of utmost point simple structure, can detect the upper and lower side of window shutter 12 and stop motor 10 simultaneously.
In foundation induction motor overload detection of the present invention, the voltage-level detector 24 of motor drive current 22 can be by carrying out the both end voltage input voltage pick-up unit of phase advance capacitor C and the similar operation of above operation.Except the motor of opening and closing used in blinds, also can be applicable to the driver element that opening and closing curtain (blind) or other equipment are used according to overload detection of the present invention and overload detection method.The application of overload detection and overload detection method is not limit.
Make and in extremely simple structure, to detect overload safely that therefore, they help to reduce the size of equipment and reduce cost according to induction motor overload detection of the present invention and overload detection method.In addition, because overload detection has simple electrical structure and without any mechanical moveable part, so overload detection has high reliability and high durability.In addition, owing to check change in voltage, so each threshold value that needn't setting voltage is mated because of the size of the window shutter driving torque different with type according to induction motor overload detection of the present invention.As a result, detect overload and have dirigibility.
Claims (2)
1. induction motor overload detection method, comprise the have phase advance capacitor induction motor (10) of (C) and the driving circuit (22) of driven induction motor (10), wherein be provided with the voltage check device (24) of the voltage that is used to detect induction motor (10), described voltage check device (24) comprises that the voltage that is used for induction motor (10) carries out the rectifier circuit (34) of half-wave rectification and is used to detect peak detector (30 through the crest voltage of the half-wave of rectification, 32), when crest voltage generation predetermined voltage changes, voltage check device (24) stops induction motor (10), described method is characterised in that, when the mean value of the winding voltage of induction motor (10) has changed predetermined value or more in a predetermined period, if the voltage of power supply (25) also changes, then ignore the variation of described winding voltage, and do not change but described winding voltage when having changed at the voltage of power supply (25), judge described induction motor (10) overload.
2. induction motor overload detection method as claimed in claim 1, the driving torque that it is characterized in that induction motor (10) is such, thereby during the open operation of window shutter (12),, during the shutoff operation of window shutter (12), come driven induction motor (10) with the value that is lower than nominal torque with nominal torque driven induction motor (10).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000392667A JP2002199786A (en) | 2000-12-25 | 2000-12-25 | Apparatus and method for detecting overload in induction motor |
| JP392667/00 | 2000-12-25 | ||
| JP392667/2000 | 2000-12-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1366188A CN1366188A (en) | 2002-08-28 |
| CN1204409C true CN1204409C (en) | 2005-06-01 |
Family
ID=18858621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011439858A Expired - Fee Related CN1204409C (en) | 2000-12-25 | 2001-12-24 | Induction motor overload detector and overload detecting method |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2002199786A (en) |
| CN (1) | CN1204409C (en) |
| TW (1) | TW503296B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2879856B1 (en) * | 2004-12-21 | 2008-07-04 | Somfy Sas | METHOD FOR OPERATING A DOMOTIC INSTALLATION COMPRISING AN ACTUATOR AND A CONTROL UNIT |
| CN105699893A (en) * | 2014-11-25 | 2016-06-22 | 国网辽宁省电力有限公司丹东供电公司 | Distribution network motor overload index prediction method and distribution network motor overload index prediction device |
| CN106869752A (en) * | 2015-12-14 | 2017-06-20 | 刘趣簪 | Intelligent shutter door |
| KR102247043B1 (en) * | 2019-12-03 | 2021-04-30 | 세메스 주식회사 | Object transport device and method of controlling the same |
-
2000
- 2000-12-25 JP JP2000392667A patent/JP2002199786A/en active Pending
-
2001
- 2001-12-18 TW TW090131385A patent/TW503296B/en not_active IP Right Cessation
- 2001-12-24 CN CNB011439858A patent/CN1204409C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| TW503296B (en) | 2002-09-21 |
| CN1366188A (en) | 2002-08-28 |
| JP2002199786A (en) | 2002-07-12 |
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Owner name: YKKAP CO., LTD. Free format text: FORMER OWNER: YKK CO., LTD. Effective date: 20040709 |
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