CN102035179A - Motor protector using positive temperature coefficient thermistor for protection - Google Patents
Motor protector using positive temperature coefficient thermistor for protection Download PDFInfo
- Publication number
- CN102035179A CN102035179A CN2010102123718A CN201010212371A CN102035179A CN 102035179 A CN102035179 A CN 102035179A CN 2010102123718 A CN2010102123718 A CN 2010102123718A CN 201010212371 A CN201010212371 A CN 201010212371A CN 102035179 A CN102035179 A CN 102035179A
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- motor
- triode
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- semistor
- resistance
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Abstract
The invention relates to a motor protector using a positive temperature coefficient thermistor for protection, which is used for protecting a motor by the positive temperature coefficient thermistor, and comprises a main contact connected to an AC contactor KM on a motor three-phase line, wherein a normally open contact of a relay, a coil of the AC contactor KM, a stop button STP and a start button ST are connected between two-phase lines of the motor, a normally open contact of the AC contactor KM is connected between two ends of the start button ST, simultaneously, an input coil of a transformer T is connected with the two-phase line of the motor, an output coil of the transformer T is connected with a coil of the relay K, and the coil of the relay K is connected with the positive temperature coefficient thermistor Rt embedded in the motor; the motor protector is small in volume, resistant to vibration, firm and reliable, and long in service life.
Description
Technical field
The present invention relates to a kind of motor protector that utilizes semistor to protect that utilizes thermosensitive resistor with positive temp coefficient that motor is protected.
Background technology
PTC is the code name of semistor, is the phthalate N type semiconductor device that forms through high temperature sintering with barium titanate and other metal oxides.Its resistance raises with temperature to be increased, and has the resistance of precipitous sudden change---temperature characterisitic.When temperature reached a certain critical temperature, resistance can doubly sharply increase by exponentially.Thermosensitive resistor with positive temp coefficient has heat sensitivity height, characteristics that thermal inertia is little, and volume is little, vibration resistance, solid reliable, long service life.
All multiple faultss of motor all can cause motor overheating and damage, for example stall, overload, winding interturn short-circuit, winding earth, phase-deficient operation, the disconnected bar of mouse cage, supply voltage is too high or too low and ventilation and heat is bad or the like.The semistor of selecting for use critical temperature and motor maximum permissible temperature to equate; be embedded in the motor winding; utilize its resistance---temperature characterisitic; no matter which kind of reason causes motor temperature to be increased near maximum permissible temperature; the thermistor resistance all can be undergone mutation; make the protective device action, thereby cut off the electricity supply, realize protection motor.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art and a kind of motor protector that utilizes semistor to protect that can protect motor is provided.
The main contacts that comprises the A.C. contactor KM that is connected on the motor three-phase line that is achieved in that of the present invention, it is characterized in that: the normally opened contact that between the two-phase circuit of motor, is connected with relay K, the coil of A.C. contactor KM, stop button STP and start button ST, be connected with the normally opened contact of A.C. contactor KM at the two ends of start button ST, on this two-phase circuit of motor, also be connected with simultaneously the input coil of transformer T, be connected with the coil of relay K on the output winding of transformer T, the coil of relay K is connected with semistor Rt in being embedded in motor.
The semistor Rt that is embedded in the motor is connected into star by three semistor Rt, and connecting to form AND circuit with three diode V5～V7, the output of this AND circuit is connected with the input of the bistable trigger-action circuit that relay K is formed again with by triode V8, triode V9.
Input in this AND circuit is connected with the bridge rectifier filter circuit of being made up of diode V1～V4, capacitor C 1 and resistance R 1.
In bistable trigger-action circuit, the output of described AND circuit is connected with the base stage of triode V8, the collector electrode of triode V8 is connected with the base stage of triode V9 with the parallel circuits of resistance R 8 by capacitor C 2, on the collector electrode of triode V9, be connected with the parallel circuits of relay K and diode V10, the emitter of triode V8 is connected with the emitter of triode V9, between the base stage of the emitter of triode V8 and triode V9, be connected with resistance R 4 and R5, between the parallel circuits of the collector electrode of triode V8 and electrical equipment K and diode V10, be connected with resistance R 3 and R1.
Between the output of AND circuit and resistance R 4 and R5, be connected with resistance R 6.In AND circuit, three semistor Rt are in parallel behind the series resistance R2 respectively, are connected with three diode V5～V7 between temperature coefficient thermistor Rt and series resistance R2, and these three diode V5～V7 are parallel with one another.
The semistor that the present invention selects for use critical temperature and motor maximum permissible temperature to equate; be embedded in the motor winding; can realize that all multiple faultss to motor cause motor overheating and the protection that damages; no matter which kind of reason causes motor temperature to be increased near maximum permissible temperature; the thermistor resistance all can be undergone mutation; make the protective device action, thereby cut off the electricity supply, realize protection motor.Therefore the present invention have that volume is little, the advantage of vibration resistance, solid reliable, long service life.
Description of drawings
Fig. 1 is the syndeton schematic diagram in the motor three-phase circuit of the present invention.
Fig. 2 is a circuit connection structure schematic diagram of the present invention.
Embodiment
As Fig. 1, shown in 2, the present invention includes the main contacts of the A.C. contactor KM that is connected on the motor three-phase line, it is characterized in that: the normally opened contact that between the two-phase circuit of motor, is connected with relay K, the coil of A.C. contactor KM, stop button STP and start button ST, be connected with the normally opened contact of A.C. contactor KM at the two ends of start button ST, on this two-phase circuit of motor, also be connected with simultaneously the input coil of transformer T, be connected with the coil of relay K on the output winding of transformer T, the coil of relay K is connected with semistor Rt in being embedded in motor.
The semistor Rt that is embedded in the motor is connected into star by three semistor Rt, and connecting to form AND circuit with three diode V5～V7, the output of this AND circuit is connected with the input of the bistable trigger-action circuit that relay K is formed again with by triode V8, triode V9.
Input in this AND circuit is connected with the bridge rectifier filter circuit of being made up of diode V1～V4, capacitor C 1 and resistance R 1.
In bistable trigger-action circuit, the output of described AND circuit is connected with the base stage of triode V8, the collector electrode of triode V8 is connected with the base stage of triode V9 with the parallel circuits of resistance R 8 by capacitor C 2, on the collector electrode of triode V9, be connected with the parallel circuits of relay K and diode V10, the emitter of triode V8 is connected with the emitter of triode V9, between the base stage of the emitter of triode V8 and triode V9, be connected with resistance R 4 and R5, between the parallel circuits of the collector electrode of triode V8 and electrical equipment K and diode V10, be connected with resistance R 3 and R1.
Between the output of AND circuit and resistance R 4 and R5, be connected with resistance R 6.
In AND circuit, three semistor Rt are in parallel behind the series resistance R2 respectively, are connected with three diode V5～V7 between temperature coefficient thermistor Rt and series resistance R2, and these three diode V5～V7 are parallel with one another.
In circuit shown in Figure 2, three PTC element Rt are connected into star, and the AND circuit through three diode V5～V7 forms is connected with the bistable trigger-action circuit that V9 forms with V8.Just often, Rt resistance is very little, and what add on the V8 base stage is negative voltage, and V8 ends, the V9 conducting, and the relay K adhesive keeps A.C. contactor to be in "on" position; Work as motor fault, winding temperature is during near maximum temperature, and the Rt resistance heightens, and the V8 base stage becomes positive voltage and conducting, and V9 ends, and K discharges, thereby has cut off motor fault.
Be connected into star by three semistor Rt; and connect to form AND circuit with three diode V5～V7; the output of this AND circuit again with by triode V8; triode V9 is connected with the input of the bistable trigger-action circuit that relay K is formed; the semistor of selecting for use critical temperature and motor maximum permissible temperature to equate; be embedded in the motor winding; can realize that all multiple faultss to motor cause motor overheating and the protection that damages; no matter which kind of reason causes motor temperature to be increased near maximum permissible temperature; the thermistor resistance all can be undergone mutation; make the protective device action; thereby cut off the electricity supply, realize protection motor.
Claims (6)
1. motor protector that utilizes semistor to protect; the main contacts that comprises the A.C. contactor KM that is connected on the motor three-phase line; it is characterized in that: the normally opened contact that between the two-phase circuit of motor, is connected with relay K; the coil of A.C. contactor KM; stop button STP and start button ST; be connected with the normally opened contact of A.C. contactor KM at the two ends of start button ST; on this two-phase circuit of motor, also be connected with simultaneously the input coil of transformer T; be connected with the coil of relay K on the output winding of transformer T, the coil of relay K is connected with semistor Rt in being embedded in motor.
2. the motor protector that utilizes semistor to protect according to claim 1; it is characterized in that: the semistor Rt that is embedded in the motor is connected into star by three semistor Rt; and connecting to form AND circuit with three diode V5～V7, the output of this AND circuit is connected with the input of the bistable trigger-action circuit that relay K is formed again with by triode V8, triode V9.
3. the motor protector that utilizes semistor to protect according to claim 2 is characterized in that: the input in this AND circuit is connected with the bridge rectifier filter circuit of being made up of diode V1～V4, capacitor C 1 and resistance R 1.
4. the motor protector that utilizes semistor to protect according to claim 2; it is characterized in that: in bistable trigger-action circuit; the output of described AND circuit is connected with the base stage of triode V8; the collector electrode of triode V8 is connected with the base stage of triode V9 with the parallel circuits of resistance R 8 by capacitor C 2; on the collector electrode of triode V9, be connected with the parallel circuits of relay K and diode V10; the emitter of triode V8 is connected with the emitter of triode V9; between the base stage of the emitter of triode V8 and triode V9, be connected with resistance R 4 and R5, between the parallel circuits of the collector electrode of triode V8 and electrical equipment K and diode V10, be connected with resistance R 3 and R1.
5. the motor protector that utilizes semistor to protect according to claim 2 is characterized in that: be connected with resistance R 6 between the output of AND circuit and resistance R 4 and R5.
6. the motor protector that utilizes semistor to protect according to claim 2; it is characterized in that: in AND circuit; three semistor Rt are in parallel behind the series resistance R2 respectively; be connected with three diode V5～V7 between temperature coefficient thermistor Rt and series resistance R2, these three diode V5～V7 are parallel with one another.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102123718A CN102035179A (en) | 2010-06-29 | 2010-06-29 | Motor protector using positive temperature coefficient thermistor for protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102123718A CN102035179A (en) | 2010-06-29 | 2010-06-29 | Motor protector using positive temperature coefficient thermistor for protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102035179A true CN102035179A (en) | 2011-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102123718A Pending CN102035179A (en) | 2010-06-29 | 2010-06-29 | Motor protector using positive temperature coefficient thermistor for protection |
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| Country | Link |
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| CN (1) | CN102035179A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112941821A (en) * | 2021-01-27 | 2021-06-11 | 江苏广中电子科技有限公司 | Mini rechargeable folding type washing machine control system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2114229U (en) * | 1992-01-25 | 1992-08-26 | 金吉和 | Fire-proof motor |
| CN101005265A (en) * | 2006-01-25 | 2007-07-25 | 应章强 | Intelligent powersaving device for AC motor |
| CN101728816A (en) * | 2009-10-23 | 2010-06-09 | 河南省电力公司新乡供电公司 | Motor overheat protector |
| CN201733073U (en) * | 2010-06-29 | 2011-02-02 | 河南省电力公司许昌供电公司 | Motor protector realizing protection by positive temperature factor thermistance |
-
2010
- 2010-06-29 CN CN2010102123718A patent/CN102035179A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2114229U (en) * | 1992-01-25 | 1992-08-26 | 金吉和 | Fire-proof motor |
| CN101005265A (en) * | 2006-01-25 | 2007-07-25 | 应章强 | Intelligent powersaving device for AC motor |
| CN101728816A (en) * | 2009-10-23 | 2010-06-09 | 河南省电力公司新乡供电公司 | Motor overheat protector |
| CN201733073U (en) * | 2010-06-29 | 2011-02-02 | 河南省电力公司许昌供电公司 | Motor protector realizing protection by positive temperature factor thermistance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112941821A (en) * | 2021-01-27 | 2021-06-11 | 江苏广中电子科技有限公司 | Mini rechargeable folding type washing machine control system |
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Application publication date: 20110427 |