CN202586287U - Overheat protection circuit of asynchronous motor - Google Patents
Overheat protection circuit of asynchronous motor Download PDFInfo
- Publication number
- CN202586287U CN202586287U CN 201220215090 CN201220215090U CN202586287U CN 202586287 U CN202586287 U CN 202586287U CN 201220215090 CN201220215090 CN 201220215090 CN 201220215090 U CN201220215090 U CN 201220215090U CN 202586287 U CN202586287 U CN 202586287U
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- main motor
- thermistor
- stator winding
- motor
- protection circuit
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Abstract
The utility model discloses an overheat protection circuit of an asynchronous motor, which comprises a stator winding of a main motor. The stator winding of the main motor is embedded with thermistor switches. The thermistor switches are connected in series with the coil of an intermediate relay and then is connected with a power supply. The contact of the intermediate relay is connected in series with the motor of a separated fan and then is connected with the power supply. The thermistor switches are PTC thermistors. The intermediate relay is a relay with a normally closed contact. The stator winding of the main motor is a three-phase winding and the stator winding of the main motor at each phase is embedded with one thermistor switch respectively. All the thermistor switches of the stator winding of the main motor are connected in series with each other. According to the utility model, the separated fan can be automatically started and stopped according to the temperature rise of the main motor, so that the safe and reliable operation of the main motor is ensured. Meanwhile, power resources are saved. Thus, the overheat protection circuit can be widely adapted to various motors.
Description
Technical field
The utility model relates to a kind of overheating protection circuit of asynchronous motor, relates in particular to the overheated air-cooled protective circuit of asynchronous motor.
Background technology
Asynchronous motor has in industrial and agricultural production extremely widely to be used; The loss that it time is produced in operation all changes heat energy into and makes that the motor feels hot; In order to guarantee that motor reliably working steady in a long-term must discharge heat; Otherwise it is aging to quicken insulating material, reduces its insulation property, energy conversion efficiency and useful life.
The most frequently used heat radiation type of cooling of asynchronous motor is utilize to ventilate to cooling off, and mainly comprises self cool, fans cold type certainly and he fans modes such as cooled.Be under the working conditions such as continuous running frequent starting, ambient temperature and ventilated environment be bad; Motor also adopts from the fan cooling and fans the type of cooling that cooling combines with him; Like motor application when Digit Control Machine Tool, the electrical control cubicles; All adopt aerofoil fan or ac fan to fan cooling fan, so that motor temperature and hottest spot temperature are controlled in the permissible value scope as him.
But existing he fan cooling or certainly fan combine him to fan in the cooling system; Supply with his Fan of main motor cooling air, no matter temperature rise, temperature and the ambient temperature of main motor, always continuously running continuously; And under most of environment; Temperature and the temperature rise that can guarantee main motor from Fan even self cooling mode are in the permissible value scope, and this moment is the in fact unwanted losses done of the fan electromotor of operation continuously, must cause the waste of power resource; Also bring the raising of whole system operating cost, it is also very uneconomical both to have wasted energy.
The utility model content
To the above-mentioned deficiency of existing in prior technology, the utility model technical problem to be solved provide a kind of can according to main motor temperature temperature rise automatic start-stop he the fan the asynchronous motor overheating protection circuit.
In order to solve the problems of the technologies described above; The asynchronous motor overheating protection circuit of the utility model; Comprise the main motor stator winding; Said main motor stator winding is embedded with thermistor switch, and said thermistor switch is connected with power supply with auxiliary relay coil series connection back, and said auxiliary relay contact is fanned motor series connection back with him and is connected with power supply.
In above-mentioned overheating protection circuit; Because the circuit design that adopts thermistor switch to connect with the auxiliary relay coil; And be embedded in temperature and the temperature rise that thermistor switch in the main motor stator winding can perception main motor stator winding, when temperature raise and when causing resistance to rise to the auxiliary relay coil losing electricity or electric and its contact is connected because the auxiliary relay contact is fanned motor with him and is connected; He fans motor must establish the beginning startup by cable; And the blast forced air of utilizing fan to produce is quickened to flow, and brushes heat-delivery surface, increases the heat-sinking capability of main motor greatly.Otherwise the auxiliary relay contact breaks off, and he fans the motor dead electricity and closes, and he quits work by Fan.In this structure; Through the temperature of the direct perception main motor stator of thermistor switch winding, and the disconnection or the connection of decision auxiliary relay contact, realize that then he fans the unlatching of motor or closes; Make it to determine him to fan the keying of motor according to main electric machine temperature rise; Not only guaranteed main motor can long-term work in the temperature range that allows, thoroughly avoided the overheated operation of main motor, even burnt out; And practiced thrift electric energy greatly, have and use advantage efficient, the saves energy resource.The characteristics that this overheating protection circuit is reasonable in design, circuit is simple, functional reliability is high are convenient to implement, and are practical.
The preferred implementation of the utility model, said thermistor switch are thermistor.The thermistor switch that adopts this semiconductor ceramic material to form, temperature coefficient is big, highly sensitive, reliable operation.
The further execution mode of the utility model, said main motor stator winding is three phase windings, all is embedded with thermistor switch in every phase main motor stator winding, the thermistor switch in each main motor stator winding is connected each other.This structure is applicable to threephase asynchronous, and thermistor switch can determine him to fan the motor operation according to the temperature of arbitrary stator winding, confirmed the reliability service of main motor.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the asynchronous motor overheating protection circuit of the utility model is done further explain.
Fig. 1 is the circuit diagram of a kind of embodiment of the utility model asynchronous motor overheating protection circuit.
Among the figure, 1-power-line terminal plate, 2-main motor stator winding, 3-thermistor switch, 4-auxiliary relay, 5-he fans motor.
Embodiment
In circuit diagram shown in Figure 1, main motor is a threephase asynchronous, and main motor windings has three phase windings.This main motor windings 2 is connected through power-line terminal plate 1 and three phase mains.In each phase winding, all be embedded with thermistor switch 3, promptly temperature-sensitive resistance switch 3 is fitted with the winding coil next-door neighbour or is wrapped up by winding coil, so that the directly temperature and the temperature rise of perception winding coil.After the coil series connection of three thermistor switches 3 and auxiliary relay 4; Be connected in three phase mains the C phase (but also A mutually or the B phase) and the PE earth connection on, and the contact of auxiliary relay 4 with after he fans motor 5 series connection also with the C of three phase mains mutually on (but same A phase or B phase) and the PE earth connection.He fans motor 5 and is monophase machine, in order to drive his Fan.
Thermistor switch 3 is the PTC thermistor, and resistance value rises to this semistor with the temperature liter; Auxiliary relay 4 adopts the relay of normally closed interlock.Under main motor normal operation, the PTC thermistor is in low resistance state, and the coil bag KA of auxiliary relay 4 gets electric, and auxiliary relay 4 normally closed interlock KA-1 break off, and he is in stop state by Fan, but this moment main motor from Fan operate as normal still.
When main motor is overheated for some reason; Main motor stator winding 2 appearance temperature raise; This moment, thermistor switch 3 was heated and resistance value rises to, auxiliary relay 4 coil losing electricities of series connection with it, contact KA-1 closure that it is normally closed; He fan motor 5 bring into operation and make main motor be able to very soon the heat radiation, make main Electrimotor ' reduce to allowed band.This overheating protection circuit just made motor be able to cooling protection through the directly internal temperature variation of the every phase winding of monitoring before overtemperature breaks through a certain preset temperature value.Simultaneously because the restorability of thermistor, the element that needn't more renew as Thermal Cutoffs after he Fan work a period of time; Main motor temperature is reduced to normal value; Thermistor switch 3 returns to low resistance state, and auxiliary relay 4 coil KA get electric, and KA-1 breaks off; He fans motor 5 and quits work again, has so not only protected main motor but also has reached energy-conservation purpose.
In another execution mode of the utility model; Be that with the foregoing description difference thermistor switch 3 is the NTC thermistor, this negative tempperature coefficient thermistor raises and the resistance minimizing with temperature; Corresponding with this, auxiliary relay 4 adopts the auxiliary relay of normally open contacts at this moment.
Above-mentioned some preferred implementations of only having enumerated the utility model, but the utility model is not limited thereto.Its thermistor switch can also adopt copper thermistor or platinum heat etc.As long as adopted motor windings to bury bag thermistor switch and relay, all should be regarded as falling in the protection range of the utility model.
Claims (5)
1. asynchronous motor overheating protection circuit; Comprise main motor stator winding (2); It is characterized in that: said main motor stator winding (2) is embedded with thermistor switch (3); Said thermistor switch (3) is connected with power supply with auxiliary relay (4) coil series connection back, and said auxiliary relay (4) contact is fanned motor (5) series connection back with him and is connected with power supply.
2. asynchronous motor overheating protection circuit according to claim 1 is characterized in that: said thermistor switch (3) is the PTC thermistor.
3. asynchronous motor overheating protection circuit according to claim 2 is characterized in that: said auxiliary relay (4) is the normally closed interlock relay.
4. according to claim 1,2 or 3 described asynchronous motor overheating protection circuits; It is characterized in that: said main motor stator winding (2) is three phase windings; All be embedded with thermistor switch (3) in every phase main motor stator winding (2), the thermistor switch (3) in each main motor stator winding (2) is series connection each other.
5. asynchronous motor overheating protection circuit according to claim 1 is characterized in that: said thermistor switch (3) is the NTC thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220215090 CN202586287U (en) | 2012-05-15 | 2012-05-15 | Overheat protection circuit of asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220215090 CN202586287U (en) | 2012-05-15 | 2012-05-15 | Overheat protection circuit of asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202586287U true CN202586287U (en) | 2012-12-05 |
Family
ID=47255655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220215090 Expired - Fee Related CN202586287U (en) | 2012-05-15 | 2012-05-15 | Overheat protection circuit of asynchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202586287U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664388A (en) * | 2012-05-15 | 2012-09-12 | 江苏利得尔电机有限公司 | Overheat protection circuit for asynchronous motor |
| CN104332954A (en) * | 2013-07-22 | 2015-02-04 | 依必安-派特穆尔芬根股份有限两合公司 | Circuit for Thermal Protection and Power Regulation of Electric Motors |
| US20150364976A1 (en) * | 2014-06-13 | 2015-12-17 | Fanuc Corporation | Overheat detection device for electric motor equipped with multiple ptc thermistors |
-
2012
- 2012-05-15 CN CN 201220215090 patent/CN202586287U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664388A (en) * | 2012-05-15 | 2012-09-12 | 江苏利得尔电机有限公司 | Overheat protection circuit for asynchronous motor |
| CN104332954A (en) * | 2013-07-22 | 2015-02-04 | 依必安-派特穆尔芬根股份有限两合公司 | Circuit for Thermal Protection and Power Regulation of Electric Motors |
| CN104332954B (en) * | 2013-07-22 | 2018-11-09 | 依必安-派特穆尔芬根股份有限两合公司 | For carrying out Thermal protection and the circuit of power regulation to motor |
| US20150364976A1 (en) * | 2014-06-13 | 2015-12-17 | Fanuc Corporation | Overheat detection device for electric motor equipped with multiple ptc thermistors |
| US10018518B2 (en) * | 2014-06-13 | 2018-07-10 | Fanuc Corporation | Overheat detection device for electric motor equipped with multiple PTC thermistors |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20180515 |