CN1312818C - Motor protector - Google Patents
Motor protector Download PDFInfo
- Publication number
- CN1312818C CN1312818C CNB031427197A CN03142719A CN1312818C CN 1312818 C CN1312818 C CN 1312818C CN B031427197 A CNB031427197 A CN B031427197A CN 03142719 A CN03142719 A CN 03142719A CN 1312818 C CN1312818 C CN 1312818C
- Authority
- CN
- China
- Prior art keywords
- activation temperature
- motor
- bimetal piece
- temperature
- motor protector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/14—Electrothermal mechanisms
- H01H71/16—Electrothermal mechanisms with bimetal element
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0852—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load directly responsive to abnormal temperature by using a temperature sensor
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Thermally Actuated Switches (AREA)
Abstract
An apparatus for protecting a motor is provided to prevent the damage due to a movable arm and stabilize an operation of the motor by operating directly the motor without a preheating process in a state of overload. An apparatus for protecting a motor includes a base, a plurality of connection terminals(34,35), a movable arm(32), a first and a second heat sensing element(31,33), and a heating element(39). The connection terminals(34,35) are fixed to the base and connected to a motor. The moving arm(32) is electrically connected to the connection terminals. The first and the second heat sensing elements(31,33) are used for releasing electrical connection states of the connection terminals in a state of overload. The heating element(39) is used for shortening an operating period of the first and the second heat sensing elements. The first and the second heat sensing elements are operated at different temperature.
Description
Technical field
The present invention relates to a kind of motor protector, it is used for protecting the motor of the compressor that uses at air-conditioning or refrigerator etc.
Background technology
The motor that uses in the compressor of air-conditioning is typically provided with a motor protector, and it is used to detect abnormal heating that rotor has been braked or rotor overload causes or abnormal current owing to motor.
As illustrated in fig. 1 and 2, this in the art motor protector is well-known.This motor protector generally includes first switch S 1 that links to each other with current supply circuit; this first switch is used for connecting and cut off this circuit to the motor supplying electric current; and the second switch S2 with first and second bimetallic elements, this second switch links to each other with this current supply circuit and connects and cut off this circuit.
This motor protector comprises a foundry goods of being made up of first pedestal 2 and second pedestal 3, and this foundry goods is equiped with first switch S 1 and the second switch S2 that is arranged on second pedestal 3 that is arranged on first pedestal 2.This circuit is connected and cut off to this first and second switch according to the magnitude of current of each switch of flowing through with around the ambient temperature of each switch.
Second switch S2 comprises two bimetallic disk 11 and 13 and moveable arms 12 with different temperatures.
The first and second bimetallic disks of installing on the installation portion 14 of second pedestal 3 11 and 13 are by the metalwork that is connected two different heat expansion coefficients and the metalwork that links to each other is constituted a cup-shaped metalwork make.The first bimetallic disk 11 set at first turn when a certain temperature, and when the first bimetallic disk is in failure state in operation, again the second bimetallic disk 13 is set for when being higher than a temperature of said temperature and turned, thereby open switch and cut off electric current.
Yet; motor protector of the prior art is installed on the outer wall of compressor usually; cause transmission to be delayed through outside wall temperature; therefore should work as when cutting off electric current when motor protector, understand under the situation that exceeds specific motor temperature, making this motor owing to current overload lost efficacy by the temperature of detection motor.In addition, there is structural defective in motor protector of the prior art, i.e. the setting repeatedly of first and second switches makes this motor protector complicated.
In addition; consider that the outer wall by compressor postpones temperature transfer; need to set the activation temperature of one second bimetallic disk; make it a little more than the first bimetallic disk; yet; owing to be difficult to accurately make two bimetallic disks, so the design of this motor protector just has limitation with different slightly activation temperature.
Have again; in the quick-action process of bimetallic disk, this bimetallic disk bump moveable arm can damage this bimetallic disk or moveable arm, thereby the bimetallic disk is loosely contacted with moveable arm; like this when electromotor overload, because switch can not be opened and cause protecting this motor.
Summary of the invention
The problem that exists by the protector that provides a kind of motor protector to solve existing type is provided one object of the present invention, and this motor protector has overcome the delay of time and can operate automatically and stably by preheating when electromotor overload.
Another object of the present invention is to provide a kind of motor protector, and it has when activation temperature, the degree of freedom aspect the designed capacity of operation automatically.
Also purpose of the present invention is to provide a kind of motor protector, even it in the contact process of bimetallic disk and moveable arm, also can guarantee the stable operation of this motor protector by avoiding damage in this process.
Therefore; an aspect of of the present present invention provides and a kind ofly is used to protect motor with antioverloading motor protector; this motor protector comprises a pedestal; be fixed on two splicing ears on this pedestal and that link to each other with the motor sidewall; one electronic and be connected to the moveable arm of this splicing ear separably; the first and second thermal actuation devices; being used for moving this moveable arm is separated from and being electrically connected of splicing ear it when the predetermined activation temperature; and a heating member that is used to reduce the actuating time of thermal actuation device, wherein the activation temperature of the first and second thermal actuation devices is differing from each other.
Another aspect of the present invention provides and a kind ofly is used to protect motor with antioverloading motor protector; this motor protector comprises a pedestal; be fixed on two splicing ears on this pedestal and that link to each other with the motor sidewall; one electronic and be connected to the moveable arm of this splicing ear separably; the first and second thermal actuation devices of cup type quick-action (snap-acting); being used for moving this moveable arm is separated from and being electrically connected of splicing ear it when the predetermined activation temperature; and heating member that is used to reduce the actuating time of thermal actuation device; wherein the activation temperature of the first and second thermal actuation devices is differing from each other; and in the moving process of moveable arm, the center axis deviation that is used for this thermal actuation device quick-action is in the axis of reference of the moveable arm that will contact with this thermal actuation device.
In the motor protector that provides in another aspect of this invention; the first and second thermal actuation devices are in response to the first and second quick-action bimetal piece of temperature; they have one first predetermined activation temperature respectively; when this temperature, can overturn to the center; and one second lower predetermined activation temperature, turning its initial condition of getting back to when this temperature.
In the motor protector that provides in another aspect of this invention; the motor that will protect is being carried out in the course of normal operation; first activation temperature of second bimetal piece is higher than first activation temperature of first bimetal piece, and second activation temperature of second bimetal piece is lower than the temperature of this motor protector.
In the motor protector that provides on the one hand more of the present invention; mid portion at this moveable arm is formed with a projection; be used for contacting with the second thermal actuation device, and the axis of reference of this moveable arm is the central axis of this projection in the actuation process of bimetal piece.
In the motor protector that also on the one hand provides of the present invention, first activation temperature of first bimetal piece is between 100～160 ℃ of scopes, and first activation temperature of second bimetal piece is higher than 40 ± 10 ℃ of first activation temperature of this first bimetal piece; Second activation temperature of first bimetal piece is between 50～80 ℃ of scopes, and second activation temperature of second bimetal piece is about-30 ℃ ± 10 ℃.
In the motor protector that also on the one hand provides of the present invention, when first bimetal piece when first activation temperature that is equal to or higher than this first bimetal piece does not activate, second bimetal piece set in 60 seconds activate.
Description of drawings
By below in conjunction with the detailed description of accompanying drawing, can more clearly understand other purpose, advantage and the details of motor protector of the present invention to preferred embodiment of the present invention.Wherein:
Fig. 1 is the cross sectional view of motor protector in the prior art;
Fig. 2 is the circuit diagram of motor protector shown in Figure 1;
Fig. 3 is that motor protector of the present invention is in the cross sectional view when not having actuating state;
Fig. 4 is the circuit diagram of motor protector shown in Figure 3;
Fig. 5 a is the cross sectional view of motor protector shown in Figure 3, and wherein the first bimetallic disk activated;
Fig. 5 b is the cross sectional view of motor protector shown in Figure 3, and wherein the second bimetallic disk activated;
Fig. 6 is the cross sectional view similar with Fig. 3, wherein board-like heating member is assembled on this motor protector;
Fig. 7 a is a schematic diagram, and the central axis that shows the contact protrusion of bimetallic disk and this moveable arm offsets with respect to each;
Fig. 7 b is the partial enlarged drawing of Fig. 7 a.
Embodiment
Below, the embodiment of 3 to 7 pairs of motor protectors of the present invention is described in conjunction with the accompanying drawings.
By the mode of example, the motor protector of describing among these embodiment is an employed type in the compressor of air-conditioning etc. below.Usually, this motor protector is directly installed on the outer wall of main body of compressor.
Fig. 3 is the cross sectional view of motor protector of the present invention, and as shown in Figure 3, this motor protector comprises a switch S 1 that is used to cut off electric current when electromotor overload.This switch S 1 comprises a pedestal, be fixed on two splicing ears 34 on this pedestal and that link to each other with the motor sidewall and 35, one electronic and be connected to the moveable arm 32 of this splicing ear separably, first and second bi-metal 31 and 33 as the thermic moving part, be used for moving this moveable arm it is separated from when the predetermined activation temperature and being electrically connected of splicing ear, and a heating member 39 that is provided with near this bi-metal.
First and second bi-metal 31 and 33 as the thermic moving part are the cup type disk of convexity, and it overturns in response to a certain temperature and raises simultaneously.The word of using in said apparatus " upset (slip over) " is represented the upturned to the inside phenomenon in center of the middle convex portion of this bi-metal.First and second bi-metal 31 and 33 are positioned at below the moveable arm 32 in pedestal, thus one overlay above another and their middle convex portion all downward.For bi-metal is firmly installed, on two sidewalls of top base, all be formed with protuberance 34.
The quick-action activation temperature of first and second bi-metal is different.Set the activation temperature of second bi-metal 33 to such an extent that be higher than the activation temperature of first bi-metal 31, this second bi-metal could activate after first bi-metal activates like this.When the temperature of turnover bi-metal is lower than a certain temperature, it will overturn once more and get back to its initial condition.
When the bi-metal under being positioned at moveable arm 32 is overturn in a certain temperature, will contact with the hemispherical projections 32c of moveable arm 32, and then moveable arm is moved up and the moving contact 32b that makes this moveable arm is separated from from the contact 38 of splicing ear 35, thereby cut off electric current supply to motor.
The quick-action activation temperature of first bi-metal 31 is set between 100～160 ℃ of scopes, considers that the situation of overload appears in motor, and this temperature exceeds the temperature that motor runs well.This class environmental factor of ability of the performance of this scope energy basis such as insulating barrier that centers on motor winding and the heating member of motor protector changes.Make bi-metal return to the temperature that temperature will be lower than the motor normal operation of reseting of its initial condition, this temperature is preferably between 50～80 ℃ of scopes.
When first bi-metal 31 when its activation temperature is not operated, second bi-metal 33 that is positioned on this first bi-metal 31 just becomes secondary operation parts.Preferably; in the course of normal operation of the motor that will protect; the quick-action activation temperature of second bi-metal is set to such an extent that be higher than 40 ± 10 ℃ of the activation temperature of this first bimetal piece, and it resets the temperature that temperature is lower than motor protector, is preferably-30 ± 10 ℃.
Can obtain the said temperature setting by applying overcurrent or transship to various compressors repeatedly, when the abnormal conditions of overcurrent or overload appearred in motor, this temperature is set had the ability of distinctive cut-out electric current.
Usually be installed at motor protector under the situation of outer wall of compressor; even having this specific temperature sets; because the outer wall of compressor also can postpone this temperature transfer; like this when motor protector detects the temperature of this motor interior and cuts off electric current; the temperature of motor interior has exceeded this specific temperature range, can make motor cause the harm of fire.
For avoiding these situations, motor protector of the present invention comprises a heating member 39, and its next-door neighbour's bi-metal is connected with splicing ear 35.
And then this heating member 39 also plays the effect that increases the degree of freedom in the motor protector design, and in view of the above, the activation temperature difference between first and second bi-metal 31 and 33 can be set greatlyyer, preferably 40 ± 10 ℃.
Particularly; adopt under two stacked bi-metal situations at existing motor protector; because the outer wall of compressor causes the transmission delay of temperature; so relative first bi-metal is not worked; second bi-metal set activation temperature be different from the activation temperature of first bi-metal, thereby be set higher about 5 to 10 ℃ than first bi-metal.Yet it is difficult making the bi-metal of utilizing small temperature differentials like this to operate, has just brought problem like this in the design of motor protector.In addition, because this first and second bi-metal is operated when very approaching temperature, just can not expects that electric current has dual cut-out effect, thereby cause reliability problems.
Yet; the heat that heating member 39 of the present invention utilizes overcurrent to produce makes this motor protector remain in a suitable preheat mode; like this; even exist big activation temperature poor between first and second bi-metal, this second bi-metal also can be operated when the specified temp of protection motor immediately.
Below, 5a and 5b are described the operation of this motor protector in conjunction with the accompanying drawings.
Fig. 5 a is the situation that first bi-metal activated in motor protector shown in Figure 3, and Fig. 5 b is the situation that second bi-metal activated in motor protector shown in Figure 3.
Because motor generation overcurrent or overload; when motor protector reaches the quick-action activation temperature; first bi-metal 31 moves second bi-metal 33 that is positioned on it when upset; this second bi-metal just can contact the projection 32c that is positioned at top transfer arm 32 like this, cuts off electric current thereby be separated from the engaging of contact 38 of splicing ear 35 by the moving contact 32b that makes transfer arm 32.In this case, owing to the environment temperature that has improved first bi-metal 31 by the preheating of heating member 39, so this first bi-metal 31 can (be participated in Fig. 5 a) by fast actuating.In temperature is that first bi-metal of having overturn is got back to its initial condition between 50 to 80 ℃ of scopes.
When first bi-metal 31 can not activate in its activation temperature owing to fault, and motor temperature has raise 40 ± 10 ℃ the time from activation temperature, second bi-metal, 33 upset and these moveable arms 32 that move up, thus cut-out is to the electric current supply (shown in Fig. 5 b) of motor.Even when being higher than the more a certain activation temperature of first bi-metal, second bi-metal also can activated fast owing to the preheating of heating member 39.When first bi-metal when its activation temperature can not activated, preferably this second bi-metal is set for and can within 60 seconds, be activated.
When being about-30 ± 10 ℃ in temperature, second bi-metal of having overturn just can get back to its initial condition.Therefore, owing to all can not get back to its initial condition,, be configured to substantially to get back to its initial condition so overturn with after cutting off electric current when it except this second bi-metal low-down temperature.
This structure is bound to avoid motor to activated owing to the bi-metal upset resets in its temperature reduction process, thereby cause to motor supplying electric current again, wherein because the failure of current that the bi-metal of having overturn will be supplied with to this motor in the inoperative process of motor, and this motor also is not restored to its non operating state.
The heating member 39 of above-mentioned motor protector is a kind of heating member of coil type, yet, also can be as described in Figure 6 board-like heating member 39 '.
Simultaneously, in the switching process of bi-metal, it will contact the projection 32c of moveable arm 32, like this, because bump between the two can make bi-metal groove or damage occur.At this moment, because the part of groove or damage appears having in bi-metal, so this bi-metal is subjected to can not contacting with the projection of moveable arm once the impact of concentrating when upset or owing to repeating to overturn, and so just can not cut off the supply of electric current and the activation temperature of other bi-metal and may be easy to be changed.
For fear of these situations, preferably, shown in Fig. 7 a and 7b, in the process of upset, preferably the central axis of cup type bi-metal is arranged to be offset to the central axis of moveable arm and the contacted projection 32c of this bi-metal.
Shown in Fig. 7 a and 7b, thus when this bi-metal upset contact protrusion 32c, the central axis 32 of the central axis 33 of bi-metal ' be offset to projection ', thus a distance D between two axial lines, formed.Utilize offseting with respect to each of axis, this is apart from the projection that allows this bi-metal contact moveable arm, thereby has reduced the impact between two parts significantly, thereby has avoided the damage of this bi-metal, has improved the reliability of operation.
According to said structure; the invention provides a kind of motor protector that can solve foregoing problems in the prior art; when overload appears in this motor; this protector not life period postpones just can be operated immediately and stably, even and have percussion also can guarantee stable operation to this moveable arm when activating.
Although preferred embodiment is described for ease of understanding the present invention, these are a part of the present invention, should be appreciated that, with disclosed embodiment all the distortion and equivalence transformation all should comprise in the present invention.For example, thus this bimetallic disk can be designed to can change its quick-action temperature or the temperature reseted is suitable for installing the various devices of this this bimetallic disk.Should be appreciated that all distortion and equivalence transformations that falls into the appended claims scope all should comprise in the present invention.
Claims (13)
1. one kind is used to protect motor with antioverloading motor protector, and this motor protector comprises:
A pedestal;
Be fixed on two splicing ears on this pedestal and that link to each other with the motor sidewall;
One electronic and be connected to the moveable arm of this splicing ear separably, and the first and second thermal actuation devices are used for moving this moveable arm it is separated from when the predetermined activation temperature and being electrically connected of splicing ear; And
A heating member that is used to reduce the actuating time of thermal actuation device,
Wherein, the activation temperature of this first and second thermal actuations device is differing from each other.
2. motor protector as claimed in claim 1; it is characterized in that; this first and second thermal actuations device is in response to the first and second quick-action bimetal piece of temperature; they have one first predetermined activation temperature respectively; when this temperature, can overturn to the center; and one second lower predetermined activation temperature, turning its initial condition of getting back to when this temperature.
3. motor protector as claimed in claim 2; it is characterized in that; the motor that will protect is being carried out in the course of normal operation; first activation temperature of second bimetal piece is higher than first activation temperature of first bimetal piece, and second activation temperature of second bimetal piece is lower than the temperature of this motor protector.
4. motor protector as claimed in claim 1 is characterized in that, is formed with a projection at the mid portion of this moveable arm, is used for contacting with the second thermal actuation device when activating, and the central axis of this projection and the second thermal actuation device offsets with respect to each.
5. motor protector as claimed in claim 3, it is characterized in that, first activation temperature of first bimetal piece is between 100～160 ℃ of scopes, and first activation temperature of second bimetal piece is higher than 40 ± 10 ℃ of first activation temperature of this first bimetal piece; Second activation temperature of first bimetal piece is between 50～80 ℃ of scopes, and second activation temperature of second bimetal piece is-30 ℃ ± 10 ℃.
6. motor protector as claimed in claim 3 is characterized in that, when first bimetal piece when first activation temperature that is equal to or higher than this first bimetal piece does not activate, second bimetal piece set in 60 seconds activate.
7. one kind is used to protect motor with antioverloading motor protector, and this motor protector comprises:
A pedestal;
Be fixed on two splicing ears on this pedestal and that link to each other with the motor sidewall;
One electronic and be connected to the moveable arm of this splicing ear separably;
The first and second thermal actuation devices of cup type quick-action are used for moving this moveable arm it are separated from when the predetermined activation temperature and being electrically connected of splicing ear; And
A heating member that is used to reduce the actuating time of thermal actuation device, wherein the activation temperature of the first and second thermal actuation devices is differing from each other, and in the moving process of moveable arm, the center axis deviation that is used for this thermal actuation device quick-action is in the axis of reference of the moveable arm that will contact with this thermal actuation device.
8. motor protector as claimed in claim 7; it is characterized in that; this first and second thermal actuations device is in response to the first and second quick-action bimetal piece of temperature; they have one first predetermined activation temperature respectively; when this temperature, can overturn to the center; and one second lower predetermined activation temperature, turning its initial condition of getting back to when this temperature.
9. motor protector as claimed in claim 8; it is characterized in that; the motor that will protect is being carried out in the course of normal operation; first activation temperature of second bimetal piece is higher than first activation temperature of first bimetal piece, and second activation temperature of second bimetal piece is lower than the temperature of this motor protector.
10. motor protector as claimed in claim 7 is characterized in that, is formed with a projection at the mid portion of this moveable arm, is used for contacting with the second thermal actuation device when activating, and the central axis of this projection and the second thermal actuation device offsets with respect to each.
11. motor protector as claimed in claim 9, it is characterized in that, first activation temperature of first bimetal piece is between 100～160 ℃ of scopes, and first activation temperature of second bimetal piece is higher than 40 ℃ ± 10 ℃ of first activation temperature of this first bimetal piece; Second activation temperature of first bimetal piece is between 50～80 ℃ of scopes, and second activation temperature of second bimetal piece is-30 ℃ ± 10 ℃.
12. motor protector as claimed in claim 9 is characterized in that, when first bimetal piece when first activation temperature that is equal to or higher than this first bimetal piece does not activate, second bimetal piece set in 60 seconds activate.
13., it is characterized in that this heating member is coil type or board-like heating member as claim 1 or 7 described motor protectors.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2002-0068145A KR100496474B1 (en) | 2002-11-05 | 2002-11-05 | Motor protector |
| KR0068145/2002 | 2002-11-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1499688A CN1499688A (en) | 2004-05-26 |
| CN1312818C true CN1312818C (en) | 2007-04-25 |
Family
ID=34270523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031427197A Expired - Fee Related CN1312818C (en) | 2002-11-05 | 2003-06-11 | Motor protector |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100496474B1 (en) |
| CN (1) | CN1312818C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005020095A1 (en) * | 2005-04-29 | 2006-11-02 | BSH Bosch und Siemens Hausgeräte GmbH | A method for economically operating the electrically heated air flow in a domestic clothes drying machine has a heated bimetallic switch in the air stream in series with the primary heating elements |
| KR100673294B1 (en) | 2005-10-20 | 2007-01-24 | 자화전자(주) | An overload protection device of compressor motor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63314734A (en) * | 1987-06-17 | 1988-12-22 | Matsushita Refrig Co | Overload protective device for motor |
| JPH01302629A (en) * | 1988-05-30 | 1989-12-06 | Matsushita Refrig Co Ltd | Overload protecting device for motor |
| US4908595A (en) * | 1989-05-12 | 1990-03-13 | Yamada Electric Mfg. Co., Ltd. | Motor protector |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0731051A (en) * | 1993-07-05 | 1995-01-31 | Texas Instr Japan Ltd | Overcurrent protector having excessive temperature rise preventive function |
| US5898555A (en) * | 1996-02-05 | 1999-04-27 | Texas Instruments Incorporated | Overload protector with overcurrent and over temperature protection |
| JP2858001B2 (en) * | 1997-03-27 | 1999-02-17 | 山田電機製造株式会社 | Thermal protector |
| KR20000036317A (en) * | 2000-01-12 | 2000-07-05 | 조옥래 | Dual type compressor motor overload protector |
-
2002
- 2002-11-05 KR KR10-2002-0068145A patent/KR100496474B1/en active IP Right Review Request
-
2003
- 2003-06-11 CN CNB031427197A patent/CN1312818C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63314734A (en) * | 1987-06-17 | 1988-12-22 | Matsushita Refrig Co | Overload protective device for motor |
| JPH01302629A (en) * | 1988-05-30 | 1989-12-06 | Matsushita Refrig Co Ltd | Overload protecting device for motor |
| US4908595A (en) * | 1989-05-12 | 1990-03-13 | Yamada Electric Mfg. Co., Ltd. | Motor protector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1499688A (en) | 2004-05-26 |
| KR20040039908A (en) | 2004-05-12 |
| KR100496474B1 (en) | 2005-06-22 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20070425 Termination date: 20160611 |