CN104714140A - Short circuit detection circuit for elevator motor - Google Patents
Short circuit detection circuit for elevator motor Download PDFInfo
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- CN104714140A CN104714140A CN201310679965.3A CN201310679965A CN104714140A CN 104714140 A CN104714140 A CN 104714140A CN 201310679965 A CN201310679965 A CN 201310679965A CN 104714140 A CN104714140 A CN 104714140A
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- triode
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- potentiometer
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Abstract
The invention discloses a short circuit detection circuit for an elevator motor. The detection circuit comprises a power supply, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first potentiometer, a second potentiometer, a third potentiometer, a first transformer, a second transformer, a first adjustable transformer, a second adjustable transformer, a first triode, a second triode, a third triode, a fourth triode, a fifth triode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first switch, a second switch, a third switch, a loudspeaker and an ampere meter. The first triode, the second transformer, the first capacitor, the first potentiometer and the second resistor form a transformer feedback oscillation circuit, sound signals are generated, and whether a short circuit happens to the motor or not can be judged by judging whether the loudspeaker produces a sound or not. The fourth capacitor and the seventh resistor form a positive feedback circuit which is used for feeding back weak sound signals induced in a first primary coil of the first transformer and a second primary coil of the first transformer to the base electrode of the second triode in a voltage feedback mode to be amplified, so that the detection circuit has the advantages of being high in detection sensitivity and stable in working.
Description
Technical field
The present invention relates to a kind of short-circuit test circuit, particularly relate to a kind of short-circuit detecting circuit for elevator motor.
Background technology
Elevator take motor as the vertical conveyor of power, box like gondola is housed, people or carrying goods is taken advantage of for tier building, motor is the power resources of elevator, treat so it must be regarded among heavily in daily repair and maintenance work, if the electric motor short circuit of elevator will cause elevator cisco unity malfunction, even cause the loss of people's life or property, therefore the motor of elevator is all provided with circuit measuring circuit, so that the problem of Timeliness coverage and solution electric motor short circuit, it is low to there is detection sensitivity in the short circuit metering circuit being conventionally used to elevator motor, job insecurity and the high problem of cost.
Summary of the invention
Object of the present invention is just to provide a kind of short-circuit detecting circuit for elevator motor to solve the problem.
In order to achieve the above object, present invention employs following technical scheme: a kind of short-circuit detecting circuit for elevator motor, comprise power supply, first resistance is to the tenth resistance, first potentiometer is to the 3rd potentiometer, first transformer, second transformer, first transtat, second transtat, first triode is to the 5th triode, first electric capacity is to the 4th electric capacity, first switch is to the 3rd switch, loudspeaker and reometer, the positive pole of described power supply respectively with the first end of described second resistance, the first end of described 3rd resistance, the first end of described 4th resistance, the first end of described 5th resistance, the first end of described 6th resistance, the collector of described 3rd triode, the emitter of described 4th triode, the first end of described 9th resistance is connected with the first end of described 8th resistance, the negative pole of described power supply is connected with the first end of described second switch, second end of described second switch respectively with the first end of described reometer, the first end of described 3rd switch, the first end of described tenth resistance, the first end of the primary coil of described second transtat, the first end of described 3rd potentiometer, the first end of the first primary coil of described first transformer, the first end of described second potentiometer, the sliding end of described second potentiometer, the first end of described first electric capacity, the first end of the primary coil of described second transformer is connected with the first end of described first resistance, second end of described first resistance is connected with the first end of described first potentiometer and the sliding end of described first potentiometer respectively, second end of described first potentiometer is connected with the first end of the second end of described second resistance and the secondary coil of described second transformer respectively, second end of the secondary coil of described second transformer is connected with the base stage of described first triode, the emitter of described first triode is connected with the second end of described 3rd resistance, the collector of described first triode respectively with the second end of the primary coil of described second transformer, second end of described first electric capacity, the first end of described second electric capacity is connected with the first end of described 7th resistance, second end of described second potentiometer respectively with the second end of described second electric capacity, second end of described 4th resistance is connected with the base stage of described second triode, the emitter of described second triode is connected with the second end of described 5th resistance, the collector of described second triode is connected with the second end of the first primary coil of described first transformer, the first end of the second primary coil of described first transformer is connected with the first end of described 3rd electric capacity and the first end of described 4th electric capacity respectively, second end of described 3rd electric capacity respectively with the second end of described 6th resistance, the base stage of described 5th triode, second end of the second primary coil of described first transformer, second end of described 3rd potentiometer is connected with the sliding end of described 3rd potentiometer, second end of described 4th electric capacity is connected with the second end of described 7th resistance, the first end of the secondary coil of described first transformer is connected with the first end of described first switch, second end of described first switch is connected with the second end of the secondary coil of described first transformer, second end of described 8th resistance is connected with the emitter of described 5th triode, the collector of described 5th triode is connected with the second end of the primary coil of described second transtat, the first end of the secondary coil of described second transtat is connected with the base stage of described 3rd triode, the adjustable end of described second transtat is connected with the second end of described 9th resistance and the second end of described tenth resistance respectively, second end of the secondary coil of described second transtat is connected with the base stage of described 4th triode, the emitter of described 3rd triode is connected with the first end of the primary coil of described first transtat, the adjustable end of described first transtat is connected with the second end of described reometer and the second end of described 3rd switch respectively, second end of the primary coil of described first transtat is connected with the collector of described 4th triode, the first end of the secondary coil of described first transtat is connected with the first end of described loudspeaker, second end of the secondary coil of described first transtat is connected with the second end of described loudspeaker.
Beneficial effect of the present invention is: the present invention is a kind of short-circuit detecting circuit for elevator motor, 4th electric capacity and the 7th resistance composition positive-feedback circuit in this testing circuit, its effect is that the base stage weak audio signal voltage sensed in the first primary coil of the first transformer and the second primary coil of the first transformer being fed back to the second triode is amplified again, positive-feedback circuit can sense faint sound signal, therefore this testing circuit has the feature of detection sensitivity height and working stability, this testing circuit also has the low feature of cost.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of short-circuit detecting circuit for elevator motor of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described: as shown in Figure 1, a kind of short-circuit detecting circuit for elevator motor of the present invention, comprise power supply E, first resistance R1 is to the tenth resistance R10, first potentiometer RP1 is to the 3rd potentiometer RP3, first transformer T1, second transformer T2, first transtat TP1, second transtat TP2, first triode VT1 is to the 5th triode VT5, first electric capacity C1 is to the 4th electric capacity C4, first switch S 1 is to the 3rd switch S 3, loudspeaker BL and reometer A, the positive pole of power supply E respectively with the first end of the second resistance R2, the first end of the 3rd resistance R3, the first end of the 4th resistance R4, the first end of the 5th resistance R5, the first end of the 6th resistance R6, the collector of the 3rd triode VT3, the emitter of the 4th triode VT4, the first end of the 9th resistance R9 is connected with the first end of the 8th resistance R8, the negative pole of power supply E is connected with the first end of second switch S2, second end of second switch S2 respectively with the first end of reometer A, the first end of the 3rd switch S 3, the first end of the tenth resistance R10, the first end of the primary coil of the second transtat TP2, the first end of the 3rd potentiometer RP3, the first end of first primary coil of the first transformer T1, the first end of the second potentiometer RP2, the sliding end of the second potentiometer RP2, the first end of the first electric capacity C1, the first end of the primary coil of the second transformer T2 is connected with the first end of the first resistance R1, second end of the first resistance R1 is connected with the first end of the first potentiometer RP1 and the sliding end of the first potentiometer RP1 respectively, second end of the first potentiometer RP1 is connected with the first end of second end of the second resistance R2 and the secondary coil of the second transformer T2 respectively, second end of the secondary coil of the second transformer T2 is connected with the base stage of the first triode VT1, the emitter of the first triode VT1 is connected with second end of the 3rd resistance R3, the collector of the first triode VT1 respectively with the second end of the primary coil of the second transformer T2, second end of the first electric capacity C1, the first end of the second electric capacity C2 is connected with the first end of the 7th resistance R7, second end of the second potentiometer RP2 respectively with second end of the second electric capacity C2, second end of the 4th resistance R4 is connected with the base stage of the second triode VT2, the emitter of the second triode VT2 is connected with second end of the 5th resistance R5, the collector of the second triode VT2 is connected with the second end of first primary coil of the first transformer T1, the first end of second primary coil of the first transformer T1 is connected with the first end of the 3rd electric capacity C3 and the first end of the 4th electric capacity C4 respectively, second end of the 3rd electric capacity C3 respectively with second end of the 6th resistance R6, the base stage of the 5th triode VT5, second end of second primary coil of the first transformer T1, second end of the 3rd potentiometer RP3 is connected with the sliding end of the 3rd potentiometer RP3, second end of the 4th electric capacity C4 is connected with second end of the 7th resistance R7, the first end of the secondary coil of the first transformer T1 is connected with the first end of the first switch S 1, second end of the first switch S 1 is connected with the second end of the secondary coil of the first transformer T1, second end of the 8th resistance R8 is connected with the emitter of the 5th triode VT5, the collector of the 5th triode VT5 is connected with the second end of the primary coil of the second transtat TP2, the first end of the secondary coil of the second transtat TP2 is connected with the base stage of the 3rd triode VT3, the adjustable end of the second transtat TP2 is connected with second end of the 9th resistance R9 and second end of the tenth resistance R10 respectively, second end of the secondary coil of the second transtat TP2 is connected with the base stage of the 4th triode VT4, the emitter of the 3rd triode VT3 is connected with the first end of the primary coil of the first transtat TP1, the adjustable end of the first transtat TP1 is connected with second end of reometer A and the second end of the 3rd switch S 3 respectively, second end of the primary coil of the first transtat TP1 is connected with the collector of the 4th triode VT4, the first end of the secondary coil of the first transtat TP1 is connected with the first end of loudspeaker BL, second end of the secondary coil of the first transtat TP1 is connected with second end of loudspeaker BL.
Principle of work of the present invention is as follows: the first triode VT1, second transformer T2, first electric capacity C1, first potentiometer RP1 and the second resistance R2 forms transformer feedback oscillatory circuit, produce sound signal, then be coupled to the second triode VT2 through the second electric capacity C2 to amplify, sound signal after amplification exports from the second triode VT2 collector, first transformer T1 is for detecting transformer, tone currents detects the first primary coil of transformer by flowing through, when detecting transformer core contact measured electric machine iron core, the main magnetic circuit detecting transformer forms path through electric machine iron core to be measured, if the non-short circuit of coil winding embedded in electric machine iron core wire casing to be measured, then will produce sound signal induced voltage at the second primary coil two ends detecting transformer, and deliver to the 5th triode VT5 and carry out voltage amplification, signal voltage after amplification is delivered to through the second transtat TP2 the push-pull power amplifier circuit be made up of the 3rd triode VT3 and the 4th triode VT4 and is carried out power amplification, signal voltage after amplification is coupled to loudspeaker BL sounding by the first transtat TP1 or is dredged up constantly to change by the pointer position of reometer again and indicates, if there is turn-to-turn short circuit in coil winding embedded in electric machine iron core wire casing to be measured, the inductance value then detecting transformer will decline to a great extent, the the second primary coil two ends detecting transformer will not produce sound signal induced voltage, so loudspeaker BL will stop sounding.
Claims (1)
1. the short-circuit detecting circuit for elevator motor, it is characterized in that: comprise power supply, first resistance is to the tenth resistance, first potentiometer is to the 3rd potentiometer, first transformer, second transformer, first transtat, second transtat, first triode is to the 5th triode, first electric capacity is to the 4th electric capacity, first switch is to the 3rd switch, loudspeaker and reometer, the positive pole of described power supply respectively with the first end of described second resistance, the first end of described 3rd resistance, the first end of described 4th resistance, the first end of described 5th resistance, the first end of described 6th resistance, the collector of described 3rd triode, the emitter of described 4th triode, the first end of described 9th resistance is connected with the first end of described 8th resistance, the negative pole of described power supply is connected with the first end of described second switch, second end of described second switch respectively with the first end of described reometer, the first end of described 3rd switch, the first end of described tenth resistance, the first end of the primary coil of described second transtat, the first end of described 3rd potentiometer, the first end of the first primary coil of described first transformer, the first end of described second potentiometer, the sliding end of described second potentiometer, the first end of described first electric capacity, the first end of the primary coil of described second transformer is connected with the first end of described first resistance, second end of described first resistance is connected with the first end of described first potentiometer and the sliding end of described first potentiometer respectively, second end of described first potentiometer is connected with the first end of the second end of described second resistance and the secondary coil of described second transformer respectively, second end of the secondary coil of described second transformer is connected with the base stage of described first triode, the emitter of described first triode is connected with the second end of described 3rd resistance, the collector of described first triode respectively with the second end of the primary coil of described second transformer, second end of described first electric capacity, the first end of described second electric capacity is connected with the first end of described 7th resistance, second end of described second potentiometer respectively with the second end of described second electric capacity, second end of described 4th resistance is connected with the base stage of described second triode, the emitter of described second triode is connected with the second end of described 5th resistance, the collector of described second triode is connected with the second end of the first primary coil of described first transformer, the first end of the second primary coil of described first transformer is connected with the first end of described 3rd electric capacity and the first end of described 4th electric capacity respectively, second end of described 3rd electric capacity respectively with the second end of described 6th resistance, the base stage of described 5th triode, second end of the second primary coil of described first transformer, second end of described 3rd potentiometer is connected with the sliding end of described 3rd potentiometer, second end of described 4th electric capacity is connected with the second end of described 7th resistance, the first end of the secondary coil of described first transformer is connected with the first end of described first switch, second end of described first switch is connected with the second end of the secondary coil of described first transformer, second end of described 8th resistance is connected with the emitter of described 5th triode, the collector of described 5th triode is connected with the second end of the primary coil of described second transtat, the first end of the secondary coil of described second transtat is connected with the base stage of described 3rd triode, the adjustable end of described second transtat is connected with the second end of described 9th resistance and the second end of described tenth resistance respectively, second end of the secondary coil of described second transtat is connected with the base stage of described 4th triode, the emitter of described 3rd triode is connected with the first end of the primary coil of described first transtat, the adjustable end of described first transtat is connected with the second end of described reometer and the second end of described 3rd switch respectively, second end of the primary coil of described first transtat is connected with the collector of described 4th triode, the first end of the secondary coil of described first transtat is connected with the first end of described loudspeaker, second end of the secondary coil of described first transtat is connected with the second end of described loudspeaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310679965.3A CN104714140A (en) | 2013-12-14 | 2013-12-14 | Short circuit detection circuit for elevator motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310679965.3A CN104714140A (en) | 2013-12-14 | 2013-12-14 | Short circuit detection circuit for elevator motor |
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| Publication Number | Publication Date |
|---|---|
| CN104714140A true CN104714140A (en) | 2015-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310679965.3A Pending CN104714140A (en) | 2013-12-14 | 2013-12-14 | Short circuit detection circuit for elevator motor |
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| CN (1) | CN104714140A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104133153A (en) * | 2014-08-19 | 2014-11-05 | 刘瑞 | Short circuit detection circuit for elevator motor |
| CN108203029A (en) * | 2016-12-19 | 2018-06-26 | 株式会社日立制作所 | Controlling apparatus for lifts door and elevator control method |
-
2013
- 2013-12-14 CN CN201310679965.3A patent/CN104714140A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104133153A (en) * | 2014-08-19 | 2014-11-05 | 刘瑞 | Short circuit detection circuit for elevator motor |
| CN108203029A (en) * | 2016-12-19 | 2018-06-26 | 株式会社日立制作所 | Controlling apparatus for lifts door and elevator control method |
| CN108203029B (en) * | 2016-12-19 | 2019-08-27 | 株式会社日立制作所 | Controlling apparatus for lifts door and elevator control method |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150617 |
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| WD01 | Invention patent application deemed withdrawn after publication |