CN201018448Y

CN201018448Y - Three-phase power-saving device for sewing machine

Info

Publication number: CN201018448Y
Application number: CNU200620108881XU
Authority: CN
Inventors: 沈建兴
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-10-23
Filing date: 2006-10-23
Publication date: 2008-02-06
Anticipated expiration: 2016-10-23

Abstract

The utility model discloses a three-phase sewing machine power saver which comprises a power saver shell and a control circuit arranged in the shell; wherein the control circuit comprises a current transformer TA, an photoelectric coupler D7, a photosensitive resistance R7, a bidirectional thyristor VT and a phase-shift trigger circuit, the current transformer TA is connected with the photoelectric coupler D7, the photoelectric coupler D7 is connected with the phase-shift trigger circuit, and the phase-shift trigger circuit is connected with bidirectional thyristor VT. The utility model has the advantages of the obvious energy-saving effect, the good shock resistance, the reliable structure and the fast response, and thereby is very suitable for the sewing machine.

Description

Three-phase sewing machine electricity-saving appliance

Technical field

The utility model belongs to a kind of battery saving arrangement, specifically a kind of three-phase sewing machine electricity-saving appliance.

Background technology

The sewing machine machine operation belongs to interrupted short-term operation, and motor is in (idle running) state of awaiting orders when not working.Down foot-operated, the clutches engaged application of load, motor enters operating state.The very big partly time of motor is in (idle running) state of awaiting orders, and is zero load.Power loss when therefore, reducing motor idle running is exactly the economize on electricity key point of this electricity-saving appliance.So far, there is the unfavorable problem of power savings in existing three-phase sewing machine electricity-saving appliance.

Summary of the invention

The purpose of this utility model is to design a kind of three-phase sewing machine electricity-saving appliance.

To be solved in the utility model is the existing unfavorable problem of three-phase sewing machine electricity-saving appliance power savings.

The technical solution of the utility model is: it comprises the electricity-saving appliance casing and is located at the interior control circuit of casing, control circuit comprises phase-shift trigger circuit I, phase-shift trigger circuit II, phase-shift trigger circuit III, optical coupler D5, optical coupler D6I, optical coupler D7, rectifier bridge D1-D4, bidirectional thyristor VT1, bidirectional thyristor VT2, bidirectional thyristor VT3, current transformer TA and triode VT4, the emitter of triode VT4 links to each other with current transformer TA by rectification circuit D1-D4, the collector electrode of triode links to each other with photoelectrical coupler D5, optical coupler D5 links to each other with optical coupler D6, optical coupler D7 optical coupler D6 links to each other, optical coupler D5, optical coupler D6, be connected with photo resistance R5 on the optical coupler D7 respectively, photo resistance R6 and photo resistance R7, photo resistance R5, photo resistance R6, photo resistance R7 respectively with phase-shift trigger circuit I, phase-shift trigger circuit II, phase-shift trigger circuit III links to each other, phase-shift trigger circuit I, phase-shift trigger circuit II and phase-shift trigger circuit III are respectively by diac D15, D16 and D17 and bidirectional thyristor VT1, bidirectional thyristor VT2, bidirectional thyristor VT3 links to each other.

The utility model is loaded on the sewing machine and uses, the advantage that has is: no matter be to be in low-voltage idle running (awaiting orders) state, or heavy load state, the three-phase voltage balance of the utility model output, starting loss is little during than total head, Fraquent start is obviously energy-conservation, the engagement of clutch low speed, and clutch is prolonged useful life; The motor stability of rotation; Vibration resistance, reliable in structure, quick response, pin one are stepped on and are promptly obtained strong impetus.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Summary of the invention

The utility model is described in further detail below in conjunction with drawings and Examples.

As shown in the figure, the utility model comprises the electricity-saving appliance casing and is located at the interior control circuit of casing, control circuit comprises phase-shift trigger circuit I, phase-shift trigger circuit II, phase-shift trigger circuit III, optical coupler D5, optical coupler D6I, optical coupler D7, rectifier bridge D1-D4, bidirectional thyristor VT1, bidirectional thyristor VT2, bidirectional thyristor VT3, current transformer TA and triode VT4, the emitter of triode VT4 links to each other with current transformer TA by rectification circuit D1-D4, the collector electrode of triode links to each other with photoelectrical coupler D5, optical coupler D5 links to each other with optical coupler D6, optical coupler D7 optical coupler D6 links to each other, optical coupler D5, optical coupler D6, be connected with photo resistance R5 on the optical coupler D7 respectively, photo resistance R6 and photo resistance R7, photo resistance R5, photo resistance R6, photo resistance R7 respectively with phase-shift trigger circuit I, phase-shift trigger circuit II, phase-shift trigger circuit III links to each other, phase-shift trigger circuit I, phase-shift trigger circuit II and phase-shift trigger circuit IH are respectively by diac D15, D16 and D17 and bidirectional thyristor VT1, bidirectional thyristor VT2, bidirectional thyristor VT3 links to each other.

Phase-shift trigger circuit I is made up of resistance R 7, R1, capacitor C 1, C4, and R7 links to each other with R1, and capacitor C 1, C4 and resistance R 1 link to each other; Phase-shift trigger circuit II is made up of resistance R 8, R2, capacitor C 2, C5, and R8 links to each other with R2, and capacitor C 2, C5 and resistance R 2 link to each other; Phase-shift trigger circuit III is made up of resistance R 9, R3, capacitor C 3, C6, and R9 links to each other with R3, and capacitor C 3, C6 and resistance R 3 link to each other.

Control circuit also comprises preset potentiometer RP1, piezo-resistance RV1, piezo-resistance RV2, piezo-resistance RV3, preset potentiometer RP1 is connected with current transformer TA, and piezo-resistance RV1, piezo-resistance RV2, piezo-resistance RV3 are in parallel with bidirectional thyristor VT1, bidirectional thyristor VT2, bidirectional thyristor VT3 respectively.

Above-mentioned control circuit also comprises indication diode H1, H2 and H3.H1 is the electricity-saving state indication; H2 is the power supply indication; H3 is the load condition indication.

Operation principle of the present utility model is: the utility model essence be have a strong positive feedback cut ripple decompression voltage regulator automatically, the use of connecting with the sewing machine motor is applicable to city's electrical network of three-phase voltage 380V, frequency 50Hz.As shown in Figure 1, R, S, T are electric power incoming line, and U, V, W export to the sewing machine motor.When motor dallies, the rectifier bridge that current transformer TA forms through diode D1, D2, D3, D4, the negative electrical charge after the rectification deposits C9 in; Preset potentiometer RP1 and resistance R 18 and triode VT4 form the load of current transformer TA jointly, and VT4 is the common base connection.Dc supply is taken from S, T phase, is transformed to current source through the big resistance R 15 of connecting, and the full-bridge rectifier of forming through diode D8, D9, D10, D11 becomes DC current source again, through voltage stabilizing didoe D12 clamper, C8 filtering, becomes the smooth voltage source again.During electric motor starting work, the big electric current of current transformer TA output, make VT4 activation, conducting, luminous tube D5, the D6 of three photoelectrical couplers, D7 are switched on simultaneously, photo resistance R10, R11, R12 reduce simultaneously, the pilot angle α of bidirectional thyristor VT1, VT2, VT3 sharply reduces, the motor increasing of exerting oneself.Starting is finished, and electric current reduces, and clutch is being not enough to conducting VT4 from state, make three photo resistance R10, R11, R12 be close to open circuit (＞3M Ω), determined very big pilot angle α by big resistance R 7, R8, R9, the motor running of " awaiting orders ", the motor lines electric current is very little.D16 is a diac, and when the absolute value of voltage of C5 rose to the trigger voltage of D16, D16 just punctured conducting, and the voltage of C5 is added on bidirectional thyristor VT2, makes its conducting.All the other two-phases in like manner.R5 plays metering function, makes thyristor VT safety.The size of R8 decision pilot angle α (α＜π).The big more conduction angle of α is just more little.The voltage effective value that the very little angle of flow obtains motor descends greatly, thereby the iron loss of motor (magnetic hysteresis loss and eddy current loss) descends greatly.

Down foot-operated, clutches engaged, motor was subjected to the strong moment of resistance when load added, transient response, electric current increases, and makes luminous tube D5, D6, the D7 of three photoelectrical couplers luminous, thereby three photo resistance R10, R11, R12 are tending towards conducting, and pilot angle α is reduced greatly, and conduction angle increases; It is big more to load, and pilot angle α levels off to zero (α → 0), and this is an extremely strong positive feedback process.Preset potentiometer RP1 be used for the adjusting intensity of positive feedback, sensitivity just (ADJ).

Other components and parts effect: RV1, RV2, RV3 are piezo-resistances, and the puncture of trying to be the first when the high voltage ripple attacks makes outside quick-break circuit breaker trip, with protection thyristor VT1, VT2, VT3.Emitter resistance R18 is to three photoelectrical coupler luminous tube current limlitings.

Claims

1. three-phase sewing machine electricity-saving appliance, comprise the electricity-saving appliance casing and be located at the interior control circuit of casing, it is characterized in that control circuit comprises phase-shift trigger circuit I, phase-shift trigger circuit II, phase-shift trigger circuit III, photoelectrical coupler D5, photoelectrical coupler D6I, photoelectrical coupler D7, rectifier bridge D1-D4, bidirectional thyristor VT1, bidirectional thyristor VT2, bidirectional thyristor VT3, current transformer TA and triode VT4, the emitter of triode VT4 links to each other with current transformer TA by rectification circuit D1-D4, the collector electrode of triode links to each other with photoelectrical coupler D5, photoelectrical coupler D5 links to each other with photoelectrical coupler D6, photoelectrical coupler D7 photoelectrical coupler D6 links to each other, photoelectrical coupler D5, photoelectrical coupler D6, be connected with photo resistance R5 on the photoelectrical coupler D7 respectively, photo resistance R6 and photo resistance R7, photo resistance R5, photo resistance R6, photo resistance R7 respectively with phase-shift trigger circuit I, phase-shift trigger circuit II, phase-shift trigger circuit III links to each other, phase-shift trigger circuit I, phase-shift trigger circuit II and phase-shift trigger circuit III are respectively by diac D15, D16 and D17 and bidirectional thyristor VT1, bidirectional thyristor VT2, bidirectional thyristor VT3 links to each other.

2. three-phase sewing machine electricity-saving appliance according to claim 1 is characterized in that phase-shift trigger circuit I is made up of resistance R 7, R1, capacitor C 1, C4, and R7 links to each other with R1, and capacitor C 1, C4 and resistance R 1 link to each other; Phase-shift trigger circuit II is made up of resistance R 8, R2, capacitor C 2, C5, and R8 links to each other with R2, and capacitor C 2, C5 and resistance R 2 link to each other; Phase-shift trigger circuit III is made up of resistance R 9, R3, capacitor C 3, C6, and R9 links to each other with R3, and capacitor C 3, C6 and resistance R 3 link to each other.

3. three-phase sewing machine electricity-saving appliance according to claim 1, it is characterized in that above-mentioned control circuit also comprises preset potentiometer RP1, piezo-resistance RV1, piezo-resistance RV2, piezo-resistance RV3, preset potentiometer RP1 is connected with current transformer TA, and piezo-resistance RV1, piezo-resistance RV2, piezo-resistance RV3 are in parallel with bidirectional thyristor VT1, bidirectional thyristor VT2, bidirectional thyristor VT3 respectively.