CN2259632Y - Three-phase electric machine phase sequence test instrument - Google Patents

Abstract

The utility model relates to a phase sequence test instrument for three-phase motors, and belongs to a phase sequence test instrument for the winding of the three-phase motor. The utility model is an instrument which can fast and accurately judge the phase sequence of the winding of the three-phase motor based on the scheduled turn direction before the three-phase motor operates. The utility model is composed of an amplifying circuit which amplifies the weak voltage generated by the winding, a shaping circuit, a phase comparison circuit and a phase sequence display circuit. The utility model causes the wire connection speed of the motor to be improved.

Description

Three phase electric machine phase sequence tester

The utility model belongs to the instrument that threephase motor winding phase sequence is measured.

At present, when using threephase motor, be the rotation direction that guarantees that it is correct, just run into wiring phase sequence problem between three phase lines of power supply and three connection terminals of motor.If any a pair of phase line is exchanged, all can cause the motor sense of rotation to change.In addition, on engineering, the motor of different capacity, cable require crimping different model wiring nose.If counter-rotating appears in threephase motor, change wiring so after, wiring nose position is often improper, has to amputate reclosing.Therefore, can determine that before wiring the small and exquisite instrument of motor windings phase sequence is very important.

The purpose of this utility model is to propose a kind of small and exquisite surveying instrument that can judge threephase motor stator winding phase sequence before the motor operation according to predetermined the turning to of motor quickly and accurately.

The purpose of this utility model is achieved in that

A kind of three phase electric machine phase sequence tester is characterized in that being made up of amplification, shaping, phase bit comparison, demonstration level Four circuit;

Described amplifying circuit is made up of operational amplifier and peripheral resistance thereof;

Described shaping circuit is made up of voltage comparator and peripheral resistance thereof;

Described phase-comparison circuit is made up of D-trigger and peripheral electric capacity thereof and resistance;

And described display circuit is made up of triode and diode and peripheral resistance thereof;

At the uniform velocity stir motor with hand, motor stator one winding earth, 2 faint sine voltage signals of two windings generation are added to the positive input terminal of 2 amplifiers respectively in addition, to amplify its sine voltage; The sine voltage that has amplified links to each other with the negative input end of voltage comparator, so that with sine wave shaped be square wave; Square wave after the shaping is squeezed into the D line of two D-triggers respectively, at its output Q end two square wave phase of D end is compared, and D-trigger output terminal Q links to each other with the output stage triode respectively by resistance; And one road transistor collector load is the light emitting diode of three different color codes of mutual series connection, and another road transistor collector load is a single color LED; Three led lightings of series connection show that then phase sequence is a positive sequence, and the luminous phase sequence that then shows of another single color LED is an inverted sequence, show thereby reach phase sequence.

In conjunction with the accompanying drawings, further specify the utility model content.

The three-way vector plot of Fig. 1 threephase motor stator winding

Fig. 2 the utility model circuit diagram

Fig. 3 the utility model circuit waveform figure

Fig. 1 is threephase motor stator winding three alignment spirograms, and u, v, w represent respectively three stator winding. If suitable with hand Hour hands or at the uniform velocity stir counterclockwise rotor, remanent magnetism cutting stator winding of rotor so, then three stator winding can produce faint Sinusoidal wave electromotive force. Therefore this motor can be regarded the generator that can send faint sinusoidal wave electromotive force as, and winding u, The electromotive force phase difference that v, w produce all differs 120 ° of phase angles. Fig. 1 (a) is three winding u, v, w; Fig. 1 (b) be three around The phase vectors figure of group u, v, electromotive force that w produces. If winding W ground connection, then the phase difference summation becomes 180 ° of phase angles, Be 60 ° of phase angle differences to each other, u is 60 ° as figure to w phase angle Uuw and v to the phase angle difference between the w phase angle Uvw like this Shown in 1 (C). We extract electromotive force simultaneously from winding u and v, it is done earlier the square wave shaping, and then compare, just Can determine under two kinds of situations of the clockwise uniform rotation of rotor and counterclockwise uniform rotation, in winding u, the v institute motional electromotive force which Individual leading, which has lagged behind. Therefore, just draw motor and turn to phase relation with the winding electric kinetic potential. This relation with Outer processing industry three-phase electricity makes the relation of electric machine rotation identical.

Fig. 2 is physical circuit figure of the present utility model. It is by amplification, shaping, phase bit comparison and show the level Four the electric circuit constitute.

Amplifying circuit is by operational amplifier A₁、A ₂And peripheral resistance R₁、R ₂、R ₃、R ₇、R ₈、R ₉Form, it is fixed to be used for amplifying The faint sine voltage that sub-winding produces.

Shaping circuit is by open-collector voltage comparator A₃、A ₄And peripheral resistance R₄、R ₅、R ₆、R ₁₀、R ₁₁、R ₁₂、 R ₁₃、R ₁₄The schmidt shaping circuit that forms, this circuit is square wave with sine wave shaped. R₁₃、R ₁₄Be pull-up resistor.

Phase-comparison circuit is by D-trigger D₁、D ₂And peripheral capacitor C and resistance R₁₅Form, be used for relatively two square waves Leading and lagged relationship. This circuit capacitance C and resistance R₁₅Play reset response, when this contactor S is closed, reset terminal r₁、r ₂Moment high potential, make Q₁Q ₂Be in original electronegative potential stand-by state.

Display circuit is by triode VT₁、VT ₂, resistance R₁₆、R ₁₇、R ₁₈、R ₁₁And light emitting diode, be again indicator lamp VD₁ -VD ₄Form, to show input signal phase order relation.

Substitutional resistance R₂₀And R₂₁Divider resistance, to take out the instrument ground wire. Instrument power source can be selected laminated battery.

As voltage comparator A₃Output waveform leading voltage comparator A₄During output waveform, D₁Trigger output Q₁Be high voltage, and D₂Trigger output Q₂Be electronegative potential. At this moment, triode VT₁Conducting, indicator lamp VD₁、VD ₂And VD₃It is shinny, The voltage-phase of this explanation the top input is leading. The resistance R of wherein connecting with indicator lamp₇It is current-limiting resistance.

Otherwise, work as A₄The leading A of output wave₃During output waveform, Q₂Be high voltage, and Q₁Be electronegative potential. Q₂High level through R₁₈Current limliting makes triode VT₂Conducting, indicator lamp VD₄Shinny. At this moment, illustrate that following input terminal voltage phase place is leading. Its Middle resistance R₁₉It is current-limiting resistance.

Uppermost input terminal is used green with yellow, following input end, and line selection redness instrumentally.And pilot lamp VD ₁, VD ₂, VD ₃Select yellow, green, red trichromatism for use.If these three pilot lamp are bright, illustrate that the three-winding line look of motor stator that two input ends and instrument ground wire connect should be yellow, green, red trichromatism.At this moment yellow line is phase line u, and green line is phase line v, and the ground wire red line is phase line w.This three look just consistent with China electrical standard.

Pilot lamp VD ₄Color does not have specific (special) requirements, VD ₄Bright, illustrate that the motor stator winding phase sequence is a negative-phase sequence, need wherein any two wires should change into correct phase order relation.

Fig. 3 is the utility model measured waveform figure, and expression is pilot lamp VD ₁, VD ₂, VD ₃Situation when bright.Fig. 3 (d) is amplifying circuit A ₁And A ₂Output waveform, Uuw is A ₁Output, Uvw is A ₂Output.Fig. 3 (e) and Fig. 3 (f) are respectively shaping circuit A ₃And A ₄Output waveform.If instrumentally line selection is at last line, as shown in phantom in FIG., shaping circuit A then ₃And A ₄Output waveform just become Fig. 3 (g) and the described situation of Fig. 3 (h).

The utility model advantage:

1, accurately measures the stator winding phase sequence of motor normal direction of rotation in advance, improve the wiring work efficiency.

2, this instrument element is few, and cost is low, and volume is little, is easy to carry, and is easy to use.

3, can measure three-phase industrial electro phase sequence.

Embodiment

Select the element model for use

The title model

Operational amplifier A ₁A ₂LM324

Voltage comparator A ₃A ₄LM339

D-trigger D ₁D ₂CD4013

Triode VT ₁VT ₂9013

Light emitting diode VD ₁-VD ₄ 5

(jaundice, green, red, Bai Sise)

Its unit in charge of construction, motor wiring speed improves greatly.

Claims (1)

1, a kind of three phase electric machine phase sequence tester is characterized in that being made up of amplification, shaping, phase bit comparison, demonstration level Four circuit;

Described amplifying circuit is made up of operational amplifier and peripheral resistance thereof;

Described shaping circuit is made up of voltage comparator and peripheral resistance thereof;

Described phase-comparison circuit is made up of D-trigger and peripheral electric capacity thereof and resistance;

And described display circuit is made up of triode and diode and peripheral resistance thereof;

At the uniform velocity stir motor with hand, motor stator one winding earth, 2 faint sine voltage signals of two windings generation are added to the positive input terminal of 2 amplifiers respectively in addition, to amplify its sine voltage; The sine voltage that has amplified links to each other with the negative input end of voltage comparator, so that with sine wave shaped be square wave; Square wave after the shaping is squeezed into the D line of two D-triggers respectively, at its output Q end two square wave phase of D end is compared, and D-trigger output terminal Q links to each other with the output stage triode respectively by resistance; And one road transistor collector load is the light emitting diode of three different color codes of mutual series connection, and another road transistor collector load is a single color LED; Three led lightings of series connection show that then phase sequence is a positive sequence, and the luminous phase sequence that then shows of another single color LED is an inverted sequence, show thereby reach phase sequence.

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