CN202094609U - Improved structure for open-phase protection and overload protection of electric motor - Google Patents
Improved structure for open-phase protection and overload protection of electric motor Download PDFInfo
- Publication number
- CN202094609U CN202094609U CN2011201525920U CN201120152592U CN202094609U CN 202094609 U CN202094609 U CN 202094609U CN 2011201525920 U CN2011201525920 U CN 2011201525920U CN 201120152592 U CN201120152592 U CN 201120152592U CN 202094609 U CN202094609 U CN 202094609U
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- motor
- thermal protector
- phase
- overload protection
- thermistor
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- Thermally Actuated Switches (AREA)
Abstract
An improved structure for open-phase protection and overload protection of an electric motor provided by the utility model is characterized in that thermal protectors are serially connected to at least two phases of windings respectively, wherein the thermal protectors are bound at the end parts of the motor windings, or can be fixed in a motor cavity in other modes, so as to induct the temperature of the motor. Each of the thermal protectors comprises a metal casing, a switch made of a bimetallic strip and mounted in the metal casing, and a thermistor with a positive temperature coefficient, wherein the thermisistor is parallelly connected to two ends of the switch made of the bimetallic strip, and is clung onto the metal casing; and the switch made of the bimetallic strip is serially connected to the windings. After adopting the technical scheme, the improved structure provided by the utility model has the advantages that the structure is simple, the use is convenient, and the problems that the present thermal protector made of the bimetallic strip resets automatically and can not be used when the motor is in a delta connection on the condition that a failure is not eliminated when performing the overload protection are particularly solved.
Description
Technical field
The utility model relates to the protection structure of a kind of motor phase shortage, overload, the particularly structure-improved of motor phase shortage, overload protection.
Background technology
Therefore regular meeting's heating and cause the damage of motor under the situation of phase shortage or overload, stall during motor usually will use various motor phase shortages, overload protection arrangement to protect motor can not damage because of overheated under the situation of phase shortage or overload, stall at present in each field.Fairly simple motor phase shortage, overload protection arrangement is that bimetallic type thermal protector commonly used is made overload protection; for three phase electric machine; it must be star connection that this thermal protector requires motor; thermal protector is connected on the star point of motor windings, and its advantage is simple in structure, easy to use.But, can not be embedded in the motor end, so can not truly reflect the actual temperature of motor because its overall dimension is bigger, after descending, motor temperature can automatically reset, thereby can not in time check and be out of order, make motor operation repeatedly under state in spite of illness easily, damage motor.The motor phase shortage of more complicated, the representative of overload protection arrangement are CN2300209Y disclosed " load monitoring formula motor protecter " just like the Chinese patent publication number; this motor protecter comprises current sensor, amplifier, follower, comparator, controllable silicon relay, indicating device; be provided with operation, overload, phase shortage indicating device; current of electric adjust adjusting knob, load dial gauge and current with high accuracy sensing circuit.Function is complete, highly sensitive though this motor protecter has, reliable in action, advantage easy to use, its circuit structure complexity.
Summary of the invention
It is less that goal of the invention of the present utility model provides a kind of size, simple in structure, easy to use, and cost is lower, and the motor phase shortage that must just can reset after cutting off the electricity supply, fixing a breakdown, the structure-improved of overload protection.
In order to realize the foregoing invention purpose, the technical solution adopted in the utility model is: the structure-improved of motor phase shortage, overload protection is characterized in that: respectively be connected in series a thermal protector at least in two phase windings, this thermal protector colligation is at electric motor winding end.
Described thermal protector; comprise metal shell and be installed in switch and a thermistor of constituting by bimetal leaf in the metal shell with positive temperature coefficient; thermistor is connected in parallel on the switch ends that is made of bimetal leaf and is close on the metal shell, and the switch series that is made of bimetal leaf is connected on the winding.
The utility model under normal circumstances, the switch that is made of bimetal leaf is closed, thermistor two ends no-voltage like this, thermistor does not generate heat.When phase shortage, overload or stall appear in motor, temperature is too high cause the switch contact that constitutes by bimetal leaf in the thermal protector to disconnect after, voltage is added in the thermistor two ends, thermistor generates heat rapidly.Because thermistor is close on the metal shell of thermal protector, before the switch that is made of bimetal leaf did not reset, the heat that thermistor produced was enough to keep the switch that is made of bimetal leaf and continues to disconnect, and motor can't move all the time.Have only as the user and cut off the electricity supply, fix a breakdown, make the temperature of thermistor drop to a certain degree after, all thermal protectors that are serially connected on the winding just can all reset, motor just can resume operation like this.Owing to adopted design as above; the utlity model has advantage simple in structure, easy to use, lower-cost; when especially having overcome existing bimetallic type thermal protector and having made overload protection; under the situation that fault does not have to get rid of, with regard to the problem that automatically resets and motor can't use during for delta connection.The utility model goes for threephase asynchronous machine, three-phase synchronous motor, three-phase transformer, the phase shortage of three-phase submersible pump, overload protection.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment 1;
Fig. 2 is the structural representation of the utility model embodiment 2;
Fig. 3 is the structural representation of the utility model embodiment 3;
Fig. 4 is the structural representation of thermal protector described in the utility model.
Embodiment
Embodiment 1: motor phase shortage as shown in Figure 1, the structure-improved of overload protection; motor windings is a Y connection; in two phase windings, respectively be connected in series a thermal protector 1; this thermal protector 1 colligation is at electric motor winding end; can certainly be fixed in the motor cavity with other form, be used for the temperature of induction machine.
Thermal protector as shown in Figure 4; comprise metal shell 11 and be installed in switch 12 and a thermistor 13(PTC of constituting by bimetal leaf in the metal shell 11) with positive temperature coefficient; thermistor 13 is connected in parallel on switch 12 two ends that are made of bimetal leaf and is close on the metal shell 11, and the switch 12 that is made of bimetal leaf is serially connected with on the winding.
When under the double action of electric current and temperature, make in the motor that the switch 12 that is made of bimetal leaf in any thermal protector 1 disconnects after, thermistor 13 and windings in series in the thermal protector.Because the resistance of thermistor is much larger than the resistance of winding; make that the pressure drop of winding two ends is almost nil; motor is in open-phase running status; an other like this phase current rises at once; simultaneous temperature also sharply rises; make the switch 12 that is made of bimetal leaf in the thermal protector 1 of an other phase disconnect, after two-phase disconnected, another also was equivalent to disconnect mutually.Under the situation that power supply does not cut off the power supply, the thermistor 13 in all thermal protectors 1 all is in febrile state.So motor can't move all the time, cuts off the electricity supply up to the user, fixes a breakdown, make the temperature of thermistor drop to a certain degree after, could move after thermal protector all resets.
Embodiment 2: motor phase shortage as shown in Figure 2, the structure-improved of overload protection; motor windings is a Y connection; in three phase windings, respectively be connected in series a thermal protector 1; this thermal protector 1 colligation is at electric motor winding end; can certainly be fixed in the motor cavity with other form, be used for the temperature of induction machine.
The structure of thermal protector 1 is with embodiment 1.
When under the double action of electric current and temperature, make in the motor that the switch 12 that is made of bimetal leaf in any thermal protector 1 disconnects after, thermistor 13 and windings in series in the thermal protector.Because the resistance of thermistor is much larger than the resistance of winding; make that the pressure drop of winding two ends is almost nil; motor is in open-phase running status; so other biphase current rises at once; simultaneous temperature also sharply rises; make the switch 12 that is made of bimetal leaf in the thermal protector 1 of other two-phase disconnect, after two-phase disconnected, another also was equivalent to disconnect mutually.Under the situation that power supply does not cut off the power supply, the thermistor 13 in all thermal protectors 1 all is in febrile state.So motor can't move all the time, cuts off the electricity supply up to the user, after fixing a breakdown, after all resetting, thermal protector could move.
Embodiment 3: motor phase shortage as shown in Figure 3, the structure-improved of overload protection; motor windings is a star-star-delta connection Y-Y-; in three phase windings, respectively be connected in series a thermal protector 1; this thermal protector 1 colligation is at electric motor winding end; can certainly be fixed in the motor cavity with other form, be used for the temperature of induction machine.
The structure of thermal protector 1 is with embodiment 1.
When under the double action of electric current and temperature, make in the motor that the switch 12 that is made of bimetal leaf in any thermal protector 1 disconnects after, can cause the switch 12 that constitutes by bimetal leaf in the thermal protector 1 of second phase, third phase to disconnect continuously fast.Under the situation that power supply does not cut off the power supply, the thermistor 13 in all thermal protectors 1 all is in febrile state.So motor can't move all the time, cuts off the electricity supply up to the user, after fixing a breakdown, after all resetting, thermal protector could move.
Claims (2)
1. the structure-improved of motor phase shortage, overload protection, it is characterized in that: respectively be connected in series a thermal protector (1) at least in two phase windings, this thermal protector (1) colligation is at electric motor winding end.
2. the structure-improved of motor phase shortage according to claim 1, overload protection; it is characterized in that: described thermal protector (1); comprise metal shell (11) and be installed in switch (12) and a thermistor (13) of constituting by bimetal leaf in the metal shell (11) with positive temperature coefficient; thermistor (13) is connected in parallel on switch (12) two ends that are made of bimetal leaf and is close on the metal shell (11), and the switch (12) that is made of bimetal leaf is serially connected with on the winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201525920U CN202094609U (en) | 2011-05-13 | 2011-05-13 | Improved structure for open-phase protection and overload protection of electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201525920U CN202094609U (en) | 2011-05-13 | 2011-05-13 | Improved structure for open-phase protection and overload protection of electric motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202094609U true CN202094609U (en) | 2011-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201525920U Expired - Fee Related CN202094609U (en) | 2011-05-13 | 2011-05-13 | Improved structure for open-phase protection and overload protection of electric motor |
Country Status (1)
| Country | Link |
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| CN (1) | CN202094609U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836207A (en) * | 2015-05-15 | 2015-08-12 | 宁波市士鑫电器有限公司 | Phase loss protection switch of three-phase motor |
| CN109066629A (en) * | 2018-09-14 | 2018-12-21 | 珠海格力电器股份有限公司 | Electric motor protective device and air-conditioning |
| CN111001653A (en) * | 2019-12-25 | 2020-04-14 | 慈溪威力电机制造有限公司 | Control method of garbage processor |
-
2011
- 2011-05-13 CN CN2011201525920U patent/CN202094609U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104836207A (en) * | 2015-05-15 | 2015-08-12 | 宁波市士鑫电器有限公司 | Phase loss protection switch of three-phase motor |
| CN109066629A (en) * | 2018-09-14 | 2018-12-21 | 珠海格力电器股份有限公司 | Electric motor protective device and air-conditioning |
| CN111001653A (en) * | 2019-12-25 | 2020-04-14 | 慈溪威力电机制造有限公司 | Control method of garbage processor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111228 Termination date: 20150513 |
|
| EXPY | Termination of patent right or utility model |