CN203301404U - Intelligent type non-contact low-power starter of single-phase asynchronous motor - Google Patents
Intelligent type non-contact low-power starter of single-phase asynchronous motor Download PDFInfo
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- CN203301404U CN203301404U CN2013203373315U CN201320337331U CN203301404U CN 203301404 U CN203301404 U CN 203301404U CN 2013203373315 U CN2013203373315 U CN 2013203373315U CN 201320337331 U CN201320337331 U CN 201320337331U CN 203301404 U CN203301404 U CN 203301404U
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The utility model provides an intelligent type non-contact low-power starter of a single-phase asynchronous motor, and belongs to the technical field of single-phase asynchronous motor starters. The intelligent type non-contact low-power starter of the single-phase asynchronous motor comprises a microprocessor unit module, a power supply conversion module and a non-contact switch module, a first power supply input terminal of the power supply conversion module is connected with a leading-out terminal M of a motor primary winding L1, and a second power supply input terminal is connected with a merging leading-out terminal Z of the motor primary winding L1 and a motor secondary winding L2. A voltage signal output terminal of the power supply conversion module is connected with a signal input terminal of the microprocessor unit module, a signal output terminal of the microprocessor unit module is connected with a control signal input terminal of the non-contact switch module, a first primary connecting terminal of the non-contact switch module is connected with the leading-out terminal M of the motor primary winding L1, and a second primary connecting terminal of the non-contact switch module is connected with a secondary winding starting circuit of the motor. The intelligent type non-contact low-power starter of the single-phase asynchronous motor is advantaged by apparent energy-saving effect, wide application, and good universality, and mass produced can be achieved.
Description
Technical field
The utility model belongs to single-phase asynchronous motor starter technical field, is specifically related to a kind of intellectual contactless starter with low power consumption of single-phase asynchronous motor, is mainly used in the starting of the refrigerant compressor of refrigerator, refrigerator etc. with single-phase asynchronous motor.
Background technology
Single-phase asynchronous motor refers to that it has major and minor two stator winding with the low-power machine of single phase alternating current power supply power supply, only has when two stator winding cooperatively interact and could produce starting torque, makes electric motor starting.When after electric motor starting, normally moving, due to the difference of project organization, its auxiliary winding can participate in work also can not participate in work.But great majority are for driving the single-phase asynchronous motor of refrigerant compressor of refrigerator, refrigerator etc., its auxiliary winding all can participate in work when entering the operation phase, and in the operation circuit of auxiliary winding, can one of series connection move electric capacity to control the phase difference between the main winding and auxiliary winding electric current, thereby improve the operational efficiency of motor.In the starting process of single-phase asynchronous motor, in order to obtain enough starting torques, usually need in the auxiliary winding circuit, connect a starting capacitance or starting resistance, make auxiliary winding when obtaining enough greatly electric current, can also keep, between itself and main winding current, suitable phase difference is arranged, guarantee the normal starting of motor, the circuit of this part connect in the auxiliary winding circuit starting capacitance or starting resistance is commonly called the auxiliary winding starting circuit.After motor completes starting, need to disconnect the auxiliary winding starting circuit to close its function, make motor be switched to normal operating conditions.The effect of single-phase asynchronous motor starter is exactly when electric motor starting, connect the auxiliary winding starting circuit and keep certain hour, and disconnects the auxiliary winding starting circuit after motor completes starting process.
Usually, the single-phase asynchronous motor starter mainly contains two kinds of forms, a kind of Weight type starter that is called as, and another kind is called as positive temperature coefficient thermistor starter, and both all need to be connected in the auxiliary winding starting circuit and just can work.Electric current when the Weight type starter utilizes electric motor starting is much larger than the characteristic of the electric current in normal when operation, and the larger electric current that produces while relying on electric motor starting carrys out the adhesive electromagnetic relay, and the auxiliary winding starting circuit is connected; After electric motor starting, along with the raising gradually of its rotating speed, electric current is corresponding to be reduced, and this makes the suction-combining force of electromagnetic relay also descend thereupon, finally under the effect of moving contact parts deadweight, is returned to off-state, and thus, the starting process of motor finishes.Positive temperature coefficient thermistor starter utilizes semistor when temperature reaches vicinity of Curie temperatures, its resistance value trends towards the unlimited characteristic that increases and realizes electric motor starting, when motor starts to start, the resistance of semistor is its normal temperature resistance, the normal temperature resistance that is used for the semistor of refrigerator compressor motor starting is generally several ohm, and described semistor also is used as starting resistance simultaneously.When the auxiliary winding starting circuit switches on power, in circuit, can produce larger auxiliary winding starting current.Under the effect of this electric current, semistor is heating up rapidly, and resistance increases rapidly, and when its temperature reached vicinity of Curie temperatures, resistance approached infinitely great, and this moment, the auxiliary winding starting circuit disconnected substantially, and motor starting process finishes.Because the Weight type starter has used contact relay, therefore have the common problem that exists of all contact relaies, as limited as contact endurance, motion and sound large, inhale while putting and produce spark or electromagnetic interference etc.Comparatively speaking, positive temperature coefficient thermistor starter shows excellent on these problems, so refrigerator has adopted positive temperature coefficient thermistor starter more with compressor electric motor.Yet positive temperature coefficient thermistor starter also has its intrinsic problem, i.e. energy consumption problem.After electric motor starting completed, in order to keep the off-state of auxiliary winding starting circuit, positive temperature coefficient thermistor starter needed the electric current that can remain its heating to continue to maintain vicinity of Curie temperatures to guarantee its temperature.On the starter of general refrigerator compressor, this electric current produces on semistor power consumption is 3 watts of left and right, and this is a no small energy waste concerning the more and more lower refrigerator of refrigeration power consumption.
Along with energy crisis is paid close attention to by countries in the world gradually, the expert in industry starts to be concerned about the energy consumption problem of positive temperature coefficient thermistor starter.In recent years, many technical improvement trials have appearred in industry, adopt bidirectional triode thyristor as electronic switch, build contactless starter with low power consumption, with this, replace the heating type high value disconnect mode of positive temperature coefficient thermistor starter, thereby can save be used to remaining the auxiliary winding starting circuit, be in the heating power consumption near the needed semistor of off-state.These contactless starter with low power consumptions are from can roughly being divided three classes on principle: the contactless starter with low power consumption of electronic timer formula, the contactless starter with low power consumption of miniaturization semistor formula and mutual inductance or inductive current detect the contactless starter with low power consumption of formula.
The Typical Representative of the contactless starter with low power consumption of electronic timer formula is the US Patent No. 5051681 of Brazilian Embraco company.This patent is controlled the bidirectional triode thyristor in the auxiliary winding starting circuit that is connected on single-phase asynchronous motor with an electronic timer based on the capacitor charging principle, at the beginning of electric motor starting, while carrying out initial power-up, electronic circuit guarantees that bidirectional triode thyristor is in conducting state, when the capacitor charging in timer completes, the operating state of bidirectional triode thyristor becomes cut-off, and the auxiliary winding starting circuit is disconnected, and electric motor starting completes.Chinese utility model patent Granted publication CN202524344 disclosed " freezer compressor power consumption starter " and for example, also belong to this type of the contactless starter with low power consumption of electronic timer formula, its principle is to adopt to realize the fully disconnection of semistor after compressor start with the bidirectional triode thyristor of circuits for triggering, reach without the purpose of remaining power consumption, but this class starter requires fully electric discharge before realizing one push start, otherwise will be in the starting completion status always and can't carry out new starting.Yet; the restriction of the refrigerator of quite a few due to design and cost arranged in the market; its defrost circuit is by connecting to power with the winding line of compressor electric motor; in other words; in the process of refrigerator switching refrigeration cycle and defrost periods, compressor is shut down does not but have complete dead electricity.This makes compressor can't start when refrigerator need to start to freeze again, and simultaneously, overload protective device is worked repeatedly in this process, causes the most at last the damage of protector self and compressor.
The principle of the contactless starter with low power consumption of miniaturization semistor formula is with the semistor of miniaturization, to replace the semistor of original large-size, the semistor of miniaturization can be remained its temperature with less energy consumption, and guarantee that it is in the high value state, thereby can reduce the loss of original large-size positive temperature coefficient thermistor starter.For the electric current of the semistor that makes to flow through miniaturization further diminishes, usually can be in the auxiliary winding starting circuit bidirectional triode thyristor of series connection, utilize the miniaturization semistor to control the break-make of bidirectional triode thyristor.the Typical Representative of this class starter has the US Patent No. 5952811 of field, Japanese village (MURATA) company and the US Patent No. 3696281 of Denmark's Danfoss (Danfoss) company, the former directly is connected on the miniaturization semistor in the trigger current loop of bidirectional triode thyristor, by the break trigger current circuit, bidirectional triode thyristor is turn-offed, latter is connected the miniaturization semistor with conventional, electric-resistance, because the resistance of semistor can change along with heating, therefore utilize the different branch pressure voltage value that causes thus, can adjust the trigger current of bidirectional triode thyristor, and finally realize the shutoff of bidirectional triode thyristor.Chinese utility model patent Granted publication CN2731142Y disclosed " a kind of bidirectional silicon controllable starter of PTC for refrigerant compressor " and for example, two semistor PTC in its technical scheme are connected on respectively in the main circuit and circuits for triggering of bidirectional triode thyristor, reduce thus the working loss of starter self.Although this class starter can complete starting to work of single-phase asynchronous motor well, but its weak point is still not break away from the dependence to semistor, heating power consumption will reach former positive temperature coefficient thermistor starter 20～30% or higher.
it is the more novel contactless starter with low power consumption of a class that mutual inductance or inductive current detect the contactless starter with low power consumption of formula, its exemplary is the Chinese invention patent Granted publication CN1294694C disclosed " mutual inductance type non-contact starter " of our company, its principle be by utilize current transformer from the operation circuit sampling of single-phase asynchronous motor to current conversion be the trigger current that is connected on the bidirectional triode thyristor the auxiliary winding starting circuit, the primary and secondary number of turn of trigger current summation current transformer by the coupling bidirectional triode thyristor, ideally realize the start of single-phase asynchronous motor and the almost operation of zero-power.Chinese invention patent Granted publication CN100490298C disclosed " no contact energy-saving starter " and for example, the inductance that its utilization is connected in motor operation circuit is converted to the current signal in circuit the voltage signal at inductance two ends, by this voltage signal being carried out to rectification, drive a light-operated bidirectional triode thyristor of small-power again, the effect of the light-operated bidirectional triode thyristor of this small-power is the break-make of controlling the circuits for triggering that are connected on the main bidirectional triode thyristor in the auxiliary winding starting circuit, and then realizes the break-make of this main bidirectional triode thyristor.This class starter, in the situation that the current transformation ratio in the operation circuit and bidirectional triode thyristor coupling are good, can be realized admirably the starting of single-phase asynchronous motor, and after starting completes, carry out the almost operation of zero-power.But this class starter also has its weak point, exactly production management is had to quite strict requirement.The starting current of the single-phase asynchronous motor of each freezer compressor is not quite similar, in addition, even same batch of production of bidirectional triode thyristor, their trigger current has certain excursion, and this scope is understood variation with temperature and is changed, the claimed range that sometimes even can exceed the single-phase asynchronous motor starting, therefore, in order to realize the consistency of starter, must to the trigger current of current transformation ratio and bidirectional triode thyristor, carry out strict matching treatment according to the requirement of the starting current of different motors, this has brought very large complexity to production management.
The state of the art from industry, although the contactless starter with low power consumption of single-phase asynchronous motor has been obtained certain breakthrough aspect power-dissipation-reduced, but still exist some problems that are difficult to solve or be short of part, the applicant has done useful design, and technical scheme described below produces under this background.
Summary of the invention
The purpose of this utility model is to provide a kind of intellectual contactless starter with low power consumption of single-phase asynchronous motor, can reduce well the power consumption of starter at the motor normal operating phase, the starting demand of motor can be detected intelligently again, the starting task of actuating motor reliably, bring managerial complexity also can for simultaneously the production of product, be easy to realize producing in enormous quantities.
the purpose of this utility model reaches like this, a kind of intellectual contactless starter with low power consumption of single-phase asynchronous motor, be characterized in: the intellectual contactless starter with low power consumption of described single-phase asynchronous motor comprises the microprocessor unit module of carrying out intelligence starting control, provide the required DC power supply of system works and motor supply power voltage switching signal power transfer module and receive the control signal of microprocessor unit module and carry out the noncontacting switch module of noncontacting switch conducting and disconnection, the first power input of power transfer module is connected with the exit M of motor main winding L1, second source input and motor master, auxiliary winding L1, the merging exit Z of L2 connects, the voltage signal output end of power transfer module is connected with the signal input part of microprocessor unit module, the signal output part of microprocessor unit module is connected with the control signal input of noncontacting switch module, the first main link of noncontacting switch module is connected with the exit M of motor main winding L1, the second main link of noncontacting switch module is connected with the auxiliary winding starting circuit of motor.
The utility model is owing to having adopted above-mentioned technical pattern, compared with prior art, the beneficial effect that has is: by the microprocessor unit module, control conducting and the disconnection that is connected on the noncontacting switch module in single-phase asynchronous motor auxiliary winding starting circuit, with this, realize the fully disconnection of auxiliary winding starting circuit after electric motor starting completes; In this design, the extra power consumption of motor when normal operation is only for remaining the power consumption of the microprocessor unit module needed power consumption of operation and required DC power supply itself, and energy-saving effect is obvious; In addition, by the microprocessor unit module, judge the starting demand of motor, can avoid when motor need to start starter not carry out the generation of the situation of starting; And, the Rule of judgment of the voltage signal that the microprocessor unit module only provides power transfer module actuating motor starting as whether, this Rule of judgment does not also rely on size and the conversion that motor moves current value in circuit, therefore can the control signal of noncontacting switch module and electric current and the conversion ratio thereof in motor operation circuit not carried out to matching treatment, on the contrary, present design is also insensitive to the concrete property of single-phase asynchronous motor, have the quite wide scope of application and good general degree, be conducive to produce in enormous quantities.
The accompanying drawing explanation
Fig. 1 is the electrical connection graph of theory diagram of the present utility model and the utility model and motor operation circuit.
Fig. 2 is the electrical schematic diagram of the operation circuit of single-phase asynchronous motor.
Fig. 3 is the electrical schematic diagram of an embodiment of noncontacting switch module of the present utility model.
Fig. 4 is the electrical schematic diagram of another embodiment of noncontacting switch module of the present utility model.
Fig. 5 is the electrical schematic diagram of the another embodiment of noncontacting switch module of the present utility model.
Fig. 6 is the electrical schematic diagram of an embodiment of power transfer module of the present utility model.
Fig. 7 is the electrical schematic diagram of an embodiment of microprocessor unit module of the present utility model.
Fig. 8 is the electrical schematic diagram of a full implementation example of the present utility model.
Embodiment
In order to make the public can fully understand technical spirit of the present utility model and beneficial effect; the applicant will describe in detail embodiment of the present utility model below by reference to the accompanying drawings; but the applicant is not the restriction to technical scheme to the description of embodiment, anyly according to the utility model design, changes in the form rather than substance all and should be considered as protection range of the present utility model.
Refer to Fig. 1 and in conjunction with Fig. 2, a kind of intellectual contactless starter with low power consumption of single-phase asynchronous motor, it is connected in motor operation circuit, for the starting of single-phase asynchronous motor, and after electric motor starting completes, disconnects the auxiliary winding starting circuit fully.The intellectual contactless starter with low power consumption 1 of described single-phase asynchronous motor, comprise be used to carrying out microprocessor unit module 11 that intelligence starting controls, be used to the power transfer module 12 of switching signal that the required DC power supply of starter work and motor supply power voltage are provided and the noncontacting switch module 13 of carrying out conducting and the disconnection of noncontacting switch according to the control signal that microprocessor unit module 11 provides.the first power input 121 of power transfer module 12 is connected with the exit M of motor main winding L1, second source input 122 and motor master, auxiliary winding L1, the merging exit Z of L2 connects, the voltage signal output end 123 of power transfer module 12 is connected with the signal input part 111 of microprocessor unit module 11, the signal output part 112 of microprocessor unit module 11 is connected with the control signal input 133 of noncontacting switch module 13, the first main link 131 of noncontacting switch module 13 is connected with the exit M of motor main winding L1, the second main link 132 of noncontacting switch module 13 is connected with the auxiliary winding starting circuit of motor.Described power transfer module 12 sends the switching signal of motor starting-up signal and motor supply power voltage to microprocessor unit module 11, two voltage signals that microprocessor unit module 11 provides according to power transfer module 12 are identified electric motor starting opportunity intelligently, noncontacting switch module 13 receives the control signal that microprocessor unit module 11 is sent, and after electric motor starting completes, disconnects the auxiliary winding starting circuit fully.
Please continue to consult Fig. 2; common single-phase asynchronous motor operation circuit comprises starting resistance 2, operation electric capacity 3, single-phase asynchronous motor 4, overheat/overload protector 5 and switch 6; if during the single-phase asynchronous motor operation, auxiliary winding L2 does not participate in work, in the motor operation circuit of correspondence, without arranging, move electric capacity 3.the master of single-phase asynchronous motor 4, auxiliary winding L1, the exit of L2 is respectively M and S, main, auxiliary winding L1, the merging exit of L2 is Z, one end of the exit M of main winding L1 and operation electric capacity 3 and an end of switch 6 are connected to a tie point A of outside single phase alternating current power supply jointly, the exit S of auxiliary winding L2 is connected with the other end of operation electric capacity 3 and an end of starting resistance 2, the other end of starting resistance 2 is connected with the other end of switch 6, main, auxiliary winding L1, the merging exit Z of L2 is connected with an end of overheat/overload protector 5, the other end of overheat/overload protector 5 is connected with another tie point B of outside single phase alternating current power supply.Wherein, be connected on exit M and the starting resistance 2 between S and the switch 6 formation auxiliary winding starting circuits of main winding and auxiliary winding L1, the L2 of single-phase asynchronous motor 4, starting resistance 2 can be capacitor, switch 6 is in conducting state at the beginning of starting, after starting completes, disconnect, thereby the auxiliary winding starting circuit is cut off.In present design, described noncontacting switch module 13 has just played this switch 6.
Refer to Fig. 3～5, show the electrical schematic diagram of three specific embodiments of noncontacting switch module 13.Wherein, shown in Fig. 3 is the simplest a kind of execution mode, and noncontacting switch module 13 directly realizes by bidirectional triode thyristor, can be used for that the electric motor starting electric current is less, also corresponding less occasion of the trigger current of bidirectional triode thyristor needs.In figure, the T1 utmost point of the first bidirectional triode thyristor Q21 is connected with the exit M of motor main winding L1 as the first main link 131 of noncontacting switch module 13, the T2 utmost point is connected with the auxiliary winding starting circuit of motor as the second main link 132 of noncontacting switch module 13, and the G utmost point is connected with the signal output part 112 of microprocessor unit module 11 as the control signal input 133 of noncontacting switch module 13.please continue to consult Fig. 4, it is a kind of execution mode that noncontacting switch module 13 consists of two bidirectional triode thyristors, be generally used for the electric motor starting electric current larger, the trigger current that bidirectional triode thyristor needs is corresponding larger occasion also, at this moment, in order to reduce the needed trigger current of noncontacting switch module 13 conducting, adopt a less auxiliary bidirectional triode thyristor of trigger current to control the action that directly is connected on the main bidirectional triode thyristor in the auxiliary winding starting circuit, to reduce the working loss of whole starter, in figure, the second bidirectional triode thyristor Q31 is main bidirectional triode thyristor, the 3rd bidirectional triode thyristor Q32 is auxiliary bidirectional triode thyristor, the G utmost point of the second bidirectional triode thyristor Q31 is connected with the T1 utmost point of the 3rd bidirectional triode thyristor Q32, the T1 utmost point of the second bidirectional triode thyristor Q31 is connected with the T2 utmost point of the 3rd bidirectional triode thyristor Q32, and be connected with the exit M of motor main winding L1 as the first main link 131 of noncontacting switch module 13, the T2 utmost point of the second bidirectional triode thyristor Q31 is connected with the auxiliary winding starting circuit of motor as the second main link 132 of noncontacting switch module 13, the G utmost point of the 3rd bidirectional triode thyristor Q32 is connected with the signal output part 112 of microprocessor unit module 11 as the control signal input 133 of noncontacting switch module 13.Please continue to consult Fig. 5, show the execution mode of the another noncontacting switch module 13 that is formed by a main bidirectional triode thyristor and a light-operated bidirectional triode thyristor, its form of the composition and principle are all similar to embodiment shown in Figure 4, and difference is that auxiliary bidirectional triode thyristor has changed light-operated bidirectional triode thyristor into by original common bidirectional triode thyristor.in figure, the 4th bidirectional triode thyristor Q41 is main bidirectional triode thyristor, its T2 utmost point, the G utmost point is connected with two outputs of light-operated bidirectional triode thyristor Q42 respectively, wherein, the T2 utmost point also is connected with the auxiliary winding starting circuit of motor as the second main link 132 of noncontacting switch module 13, the T1 utmost point of the 4th bidirectional triode thyristor Q41 is connected with the exit M of motor main winding L1 as the first main link 131 of noncontacting switch module 13, the input of light-operated bidirectional triode thyristor Q42 is connected with the signal output part 112 of microprocessor unit module 11 as the control signal input 133 of noncontacting switch module 13, another input of light-operated bidirectional triode thyristor Q42 is connected with the positive voltage terminal VCC of DC power supply.
Refer to Fig. 6, described power transfer module 12 comprises the first resistance R 51, the second resistance R 52, the 3rd resistance R 53, the first capacitor C 51, the second capacitor C 52, the 3rd capacitor C 53, voltage stabilizing didoe D51, the first diode D52 and the second diode D53.the positive pole of the negative pole of voltage stabilizing didoe D51 and the second capacitor C 52, one end of one end of the second resistance R 52 and the 3rd capacitor C 53 connects, and be connected with the exit M of motor main winding L1 as the first power input 121 of power transfer module 12, while is as the positive voltage terminal VCC of DC power supply, one end of the positive pole of voltage stabilizing didoe D51 and the first resistance R 51, the negative pole of one end of the first capacitor C 51 and the first diode D52 connects, the other end of the first resistance R 51 is connected with the other end of the first capacitor C 51 and the negative pole of the second diode D53, and as the second source input 122 and motor master of power transfer module 12, auxiliary winding L1, the merging exit Z of L2 connects, the positive pole of the second diode D53 is connected with an end of the 3rd resistance R 53 and the other end of the 3rd capacitor C 53, the other end of the 3rd resistance R 53 is connected with the other end of the second resistance R 52, and be connected with the signal input part 111 of microprocessor unit module 11 as the voltage signal output end 123 of power transfer module 12, the positive pole of the first diode D52 is connected with the negative pole of the second capacitor C 52, and as the earth terminal GND of DC power supply.wherein, voltage stabilizing didoe D51, the first diode D52, the first capacitor C 51, the second capacitor C 52 and the first resistance R 51 form a non-isolated interchange input DC power the simplest, the voltage stabilizing value of voltage stabilizing didoe D51 is determined according to the output voltage values of this DC power supply, the first diode D52 is rectifier diode, has the halfwave rectifier function, the size of the rated current of the first diode D52 and the first capacitor C 51 is all determined by the electric current of the required output of DC power supply, the first resistance R 51 is the first capacitor C 51 needed discharge resistance that discharges during for outage, its resistance is determined by the length of discharge time.First, second power input 121,122 of circuit is connected respectively to the exit M of motor main winding L1 and the merging exit Z of motor main winding and auxiliary winding L1, L2, be thus connected the single phase alternating current power supply of direct-driving motor operation, output dc voltage after this single phase alternating current power supply is carried out to the voltage stabilizing rectification, as the required DC power supply of starter overall work.In addition, the second resistance R 52, the 3rd resistance R 53, the second diode D53 and the 3rd capacitor C 53 form the rectification and voltage division translation circuit that the alternating voltage between the merging exit Z of the exit M of motor main winding L1 and motor main winding and auxiliary winding L1, L2 is carried out to rectification and voltage division, wherein, the second diode D53 is rectifier diode.This circuit is converted to the ac voltage signal that loads on single-phase asynchronous motor to be convenient to the low-voltage dc signal that microprocessor unit module 11 is processed, described microprocessor unit module 11 receives these low-voltage dc signals, using its as whether the actuating motor starting according to one of.
refer to Fig. 7, described microprocessor unit module 11 comprises the 4th resistance R 61 and microprocessor unit 114, one end of the 4th resistance R 61 is connected with the control signal input 133 of noncontacting switch module 13 as the signal output part 112 of microprocessor unit module 11, the other end of the 4th resistance R 61 is connected with the output 115 of microprocessor unit 114, the input 117 of microprocessor unit 114 is connected with the voltage signal output end 123 of power transfer module 12 as the signal input part 111 of microprocessor unit module 11, the positive supply link 116 of microprocessor unit 114 meets the positive voltage terminal VCC of DC power supply, the power supply ground link 118 of microprocessor unit 114 is connected with the earth terminal GND of DC power supply.In the present embodiment, described microprocessor unit 114 comprise microprocessor chip with and the essential subsidiarity circuit as power circuit, pierce circuit etc., described microprocessor chip can be single-chip microcomputer, can be also DSP microprocessor etc.Described the 4th resistance R 61 is current-limiting resistance.Microprocessor unit module 11 is obtained the low-voltage dc signal that is converted to by the motor supply power voltage from power transfer module 12 through signal input part 111, and through the control signal of signal output part 112 to noncontacting switch module 13 output correspondences.Herein, microprocessor unit 114 both can read by the analog-to-digital conversion mode digital value of the switching signal of motor supply power voltage from power transfer module 12, also can be by suitable conversion ratio is set in power transfer module 12, motor supply power voltage signal is converted to the high-low level value that the signal input part 111 of microprocessor unit 114 can directly read.
Please continue to consult Fig. 1 and in conjunction with Fig. 8, the operation principle of starter of the present utility model is described.Fig. 8 shows the electrical schematic diagram of the intellectual contactless starter with low power consumption of a complete single-phase asynchronous motor, this starter is connected in series in the auxiliary winding starting circuit of single-phase asynchronous motor by first, second main link 131,132 of noncontacting switch module 13, and the second source input 122 by power transfer module 12 is connected with the merging exit Z of motor main winding and auxiliary winding L1, L2 again.Starter described in the utility model comes intelligent decision whether to need to carry out " the auxiliary winding starting circuit was disconnected after the conducting fixed time " this motor starting process by two starting conditions.one, at the beginning of energising, i.e. the first energising of electric system is the actuating motor starting process, described microprocessor unit module 11 is controlled described noncontacting switch module 13 and is disconnected after conducting set time T1, to complete the starting process of motor, they are two years old, for motor in the situation that do not cut off the power supply, if its supply power voltage is lower than a certain designated value, and when this voltage rises to another higher designated value again, it is the actuating motor starting process, particularly, exit M and the master of motor main winding L1, auxiliary winding L1, voltage between the merging exit Z of L2 first is reduced to below a certain designated value, if the designated value of this moment is the first voltage threshold V1, then this voltage again rises to higher than the first voltage threshold V1 and has reached another designated value that needs actuating motor, if another designated value of this moment is second voltage threshold value V2, in this case, after controlling noncontacting switch 13 conducting set time of module T2, microprocessor unit module 11 disconnects, to complete motor starting process.Described the first voltage threshold V1 and second voltage threshold value V2 set according to the actual starting specification of single-phase asynchronous motor, and be solidificated in microprocessor unit module 11, described set time T1, T2 be by single-phase asynchronous motor is determined as starting test, and be solidificated in microprocessor unit module 11.Its conditional one is the energising starting conditions of general single-phase asynchronous motor, and condition two is mainly used in a kind of particular application of refrigerator compressor motor starting: when the defroster circuit passes through the compressor line powering, the situation of voltage drop to a lower value will appear in refrigerator compressor motor, this moment, motor can not rotate, when defroster completes, this voltage will be restored to normal power voltage.Condition two can be processed electric motor starting in this case admirably.Simultaneously, the extra power consumption of intellectual contactless starter with low power consumption when motor normally moves of single-phase asynchronous motor described in the utility model is only for remaining the power consumption of the microprocessor unit module 11 needed power consumptions of operation and required DC power supply itself, take more common microprocessor as example, usually can be controlled in 0.05 watt, energy-saving effect is obvious.In addition, present design employing voltage signal rather than motor current signal are as the basis for estimation of electric motor starting, therefore, present design has wider motor accommodation, from principle, analyze, as long as noncontacting switch module 13 wherein can be born the auxiliary winding starting current of motor, just go for this motor, and need not too much match management be arranged to actual starting current and the running current of motor.
Claims (1)
1. the intellectual contactless starter with low power consumption of a single-phase asynchronous motor, it is characterized in that: the intellectual contactless starter with low power consumption (1) of described single-phase asynchronous motor comprises the microprocessor unit module (11) of carrying out intelligence starting control, provide the required DC power supply of system works and motor supply power voltage switching signal power transfer module (12) and receive the control signal of microprocessor unit module (11) and carry out the noncontacting switch module (13) of noncontacting switch conducting and disconnection, first power input (121) of power transfer module (12) is connected with the exit M of motor main winding L1, second source input (122) and motor master, auxiliary winding L1, the merging exit Z of L2 connects, the voltage signal output end (123) of power transfer module (12) is connected with the signal input part (111) of microprocessor unit module (11), the signal output part (112) of microprocessor unit module (11) is connected with the control signal input (133) of noncontacting switch module (13), the first main link (131) of noncontacting switch module (13) is connected with the exit M of motor main winding L1, the second main link (132) of noncontacting switch module (13) is connected with the auxiliary winding starting circuit of motor.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326632A (en) * | 2013-06-13 | 2013-09-25 | 常熟市天银机电股份有限公司 | Intelligent contactless low-power-consumption starter of one-phase asynchronous motor |
| CN107086820A (en) * | 2017-05-26 | 2017-08-22 | 安徽美芝制冷设备有限公司 | Start control circuit, compressor assembly and the refrigeration plant of load motor |
| CN108566121A (en) * | 2018-05-04 | 2018-09-21 | Tcl家用电器（合肥）有限公司 | Compressor start circuit and refrigeration equipment |
| CN108878219A (en) * | 2018-07-04 | 2018-11-23 | 珠海瑞景电子科技有限公司 | A kind of control circuit based on starting relay |
| CN112003543A (en) * | 2020-08-25 | 2020-11-27 | 秦孝文 | Single-phase alternating current motor open-phase detection, starting and operation control method and electronic module |
-
2013
- 2013-06-13 CN CN2013203373315U patent/CN203301404U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326632A (en) * | 2013-06-13 | 2013-09-25 | 常熟市天银机电股份有限公司 | Intelligent contactless low-power-consumption starter of one-phase asynchronous motor |
| CN103326632B (en) * | 2013-06-13 | 2016-01-20 | 常熟市天银机电股份有限公司 | The intellectual contactless starter with low power consumption of single-phase asynchronous motor |
| CN107086820A (en) * | 2017-05-26 | 2017-08-22 | 安徽美芝制冷设备有限公司 | Start control circuit, compressor assembly and the refrigeration plant of load motor |
| CN107086820B (en) * | 2017-05-26 | 2023-11-03 | 安徽美芝制冷设备有限公司 | Starting control circuit of single-phase alternating current motor, compressor system and refrigeration equipment |
| CN108566121A (en) * | 2018-05-04 | 2018-09-21 | Tcl家用电器（合肥）有限公司 | Compressor start circuit and refrigeration equipment |
| CN108878219A (en) * | 2018-07-04 | 2018-11-23 | 珠海瑞景电子科技有限公司 | A kind of control circuit based on starting relay |
| CN108878219B (en) * | 2018-07-04 | 2020-06-30 | 珠海瑞景电子科技有限公司 | Control circuit based on starting relay |
| CN112003543A (en) * | 2020-08-25 | 2020-11-27 | 秦孝文 | Single-phase alternating current motor open-phase detection, starting and operation control method and electronic module |
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