CN87204152U

CN87204152U - Double-current transducer type earthometer for winding inside slot of core

Info

Publication number: CN87204152U
Application number: CN 87204152
Authority: CN
Inventors: 杨继保
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-04-23
Filing date: 1987-04-23
Publication date: 1987-12-30

Abstract

The utility model discloses a double-current transducer type earth meter for a winding inside the slot of the core, comprising two identical current sensors composed of iron core coils, and the current sensors are connected with the input end of the signal detecting, keeping and displaying circuit after being connected in series. A pulsed current or a power frequency and an intermediate-frequency current pass through the iron core and the winding of the motor to be measured, the two current sensors are respectively placed on the both ends of the slot coil to be measured, and the earth meter can know whether the measuring slot has an earth point or not according to the displaying of the display. The signal detecting, keeping and displaying circuit can adopt the electronic circuit of the current meter, the oscillograph or the general semiconductor.

Description

Double-current transducer type earthometer for winding inside slot of core

The utility model relates to ground connection detector in a kind of double-current sensor slot for winding.

In the motor manufacture process,, the burr of punching uneven owing to the motor lamination, other foreign matters enter in the groove or the reasons such as damage during rule, all can cause ground connection in the motor windings groove.Detect the method for earth point at present, adopt to feed big electric current or milivoltmeter measurement, feed big electric current the fault of ground connection winding is enlarged, coil is scrapped, less with the scope of application that milivoltmeter is checked, and be difficult for detecting concrete ground slot.

The purpose of this utility model provides a kind of coil that do not damage, and can accurately find out the general detector of ground slot again.

Principle of work of the present utility model is respectively to put a current sensor that performance is the same at the two ends for the treatment of a certain groove of measured motor, after two sensors oppositely is connected in series, between winding coil and iron core, feed a pulse current, if no earth point in this groove, then the size and Orientation by this slot coil electric current be identical be same electric current, the induced potential equal and opposite in direction that it produces in two current sensors and direction is opposite, be zero after the stack, it is bright that instrument is shown as red light, if earth point is arranged in this groove, because of flowing through the current opposite in direction of this slot coil, be input to signal deteching circuit after the induced potential stack that in two sensors, produces, behind relevant circuit function, green light is bright and red light does not work.The i.e. situation of the groove of surveying as can be known.

The utility model can be made up of three parts such as pulse generating circuit, input, maintenance and display circuit and double-current sensors, and pulse generating circuit is by diode D ₁, D ₂, controllable silicon SCR, resistance R ₁, R ₃, R ₄, capacitor C ₁, K switch, normally open push button switch AN, the composition such as winding of transformer B is connected to a pilot lamp XD ₁, power supply is after transformation, through R ₁, XD ₁, D ₁To capacitor C ₁Charging is in capacitor C ₁Two ends obtain a high voltage, pulse output end CK ₁A termination motor windings, another termination electric machine iron core, when AN presses when connecting, SCR obtains a trigger voltage and conducting, C ₁Through SCR winding, iron core discharge, just form a bigger pulse current, the earth point of partial earth also can be detected.Signal deteching circuit is by diode D ₄, D ₅, capacitor C ₅, C ₆, resistance R ₁₃, R ₁₄Form, when being input as of input end 3,4 is zero, BG ₄End, when input is arranged, BG ₄Conducting.

Signal maintenance and display circuit are by triode BG ₁, BG ₂, BG ₃, diode D ₃, capacitor C ₄, resistance R ₂, R ₅～R ₁₂, compositions such as light emitting diode HD, LD.Work as BG ₄When ending, BG ₂Also end and BG ₁Conducting.Be serially connected in BG ₂Collector loop in LD do not work and go here and there at BG ₁HD in the collector loop is bright, works as BG ₄During conducting, BG ₃End and BG ₂Conducting, LD is bright, BG ₁End, HD extinguishes.

BG after pulse current in the motor windings disappears ₄End capacitor C ₄Through R ₁₂Charging reaches BG after the certain voltage ₃Conducting, BG ₂End, LD extinguishes, BG ₁Conducting, HD is bright, adjusts C ₄Or R ₁₂Can adjust and keep the demonstration time.

Current sensor in the utility model is by the iron core winding, shielding cases etc. are formed, iron core is to build up with the silicon steel sheet that is Jiong shape opening, the groove width of A/F a3 and tested electric machine iron core is close, limit, the two ends m of punching is the circular arc of concave or convex, its radius-of-curvature is suitable with iron core radius to be measured, so that reduce magnetic resistance.Be wound with the coil of certain number of turn on iron core two stem stems, iron core, coil have an irony shielding case outward, and the injection ring epoxy resins, make it integrated.The utility model oppositely is connected in series use with the current sensor that has two parameters to equate.

Certainly, pulse voltage generation circuit and input, maintenance and display circuit also can have various ways.Between winding iron core, also can feed power frequency or electric current of intermediate frequency, with the synthetic electromotive force in reometer or the oscillograph detection two sensors.

Accompanying drawing 1 is the synoptic diagram that two current sensor senses do not have the earth point coil.

Accompanying drawing 2 is synoptic diagram that two current sensor senses have the earth point coil.

Accompanying drawing 3 is pulse voltage generation circuit of the present utility model, input, maintenance and display circuit schematic diagram.Among the figure: CK ₁Be pulse voltage output, the 1, the 2nd, output terminal, CK ₂Be signal output, input end, the 3, the 4th, the testing circuit signal input part, the 5, the 6th, the signal output part of current sensor, QL are rectification circuits.

Accompanying drawing 4(a) is the synoptic diagram that the earth point coil is arranged by the double-current sensor that is shown by test coil, iron core, oscillograph with power frequency or electric current of intermediate frequency.

Accompanying drawing 4(b) is the synoptic diagram that the earth point coil is arranged by the double-current sensor that is shown by test coil, iron core, reometer with power frequency or electric current of intermediate frequency.

Accompanying drawing 5(a), (b) be sensor core stamping shape synoptic diagram, a3 is an A/F, m is limits, punching two ends, can be indent, evagination or straight flange.Among the figure: a1, b1, h3 are sensor outer housing length sizes, and a2 is that silicon steel sheet is outer wide, and a3 is its A/F, h1 is the maximum length at silicon steel sheet two ends, h2 is a silicon steel sheet horizontal edge width, and b2 is a sensor iron core thickness, and R is the radius-of-curvature of its concave or convex.

Embodiment: each size of sensor is: a1=52, a2=37, a3=15, b1=28, b2=13, h1=35, h2=13, h3=35, R=65.Unit: mm.Coil turn=500.

Claims

1, ground connection detector in a kind of double-current sensor slot for winding comprises the current sensor that is made of two iron-core coils, and the pulse voltage that is made of transformer B, controllable silicon SCR, capacitor C etc. forms circuit, by rectification circuit QL, resistance R ₁₃, R ₁₄, diode D ₄, D ₅, capacitor C ₅, C ₆, triode BG ₄The signal deteching circuit, the triode BG that form ₁, BG ₂, BG ₃The signal that the resistance of light emitting diode HD, LD necessity, electric capacity constitute keeps and display circuit, or power frequency, intermediate frequency power supply E, reometer or oscillograph, it is characterized in that the iron core that is described current sensor is built up by the silicon steel sheet that is Jiong shape opening, be wound with coil on two stem stems of described iron core, each parameter of described two current sensors equates, oppositely output terminal 5,6 and the described signal deteching circuit input end 3,4 after the serial connection joins, and output terminal 1,2 and the motor windings to be measured and the iron core of described pulse voltage generation circuit join.

2, detector according to claim 1 is characterized in that described sensor core stamping A/F a3 is close with electric machine iron core groove width to be measured, and limit, the two ends m of punching is the circular arc of concave or convex, and its radius-of-curvature is suitable with electric machine iron core radius to be measured.

3,, it is characterized in that output terminal 5, the 6 serial connection reometers after described two current sensors serial connection or join with oscillographic input end according to claim 1,2 described detectors.