CN1482734A - air conditioner - Google Patents
air conditioner Download PDFInfo
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- CN1482734A CN1482734A CNA031427227A CN03142722A CN1482734A CN 1482734 A CN1482734 A CN 1482734A CN A031427227 A CNA031427227 A CN A031427227A CN 03142722 A CN03142722 A CN 03142722A CN 1482734 A CN1482734 A CN 1482734A
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- inverter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/025—Motor control arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
- H02P2201/09—Boost converter, i.e. DC-DC step up converter increasing the voltage between the supply and the inverter driving the motor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
- Air Conditioning Control Device (AREA)
- Rectifiers (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
本发明提供一种空调装置。在驱动空调机用的压缩机的电动机的控制中采用具有将交流变换成直流并使直流电压上升的功能的电力变换电路和对同步电动机进行矢量控制并具有弱磁控制功能的电动机控制装置。当使该电动机的转速上升时，优先于弱磁控制而选择使直流电压上升的装置。这样，不会不必要地采取效率变差的弱磁控制。为此，从低速到高速控制电动机时实现了各运行状态的高效率控制。
The invention provides an air conditioner. A power conversion circuit with a function of converting AC to DC to increase the DC voltage and a motor control device with vector control of a synchronous motor and a field weakening control function are used to control a motor that drives a compressor for an air conditioner. When increasing the rotational speed of the motor, a device that increases the DC voltage is selected prior to the field weakening control. In this way, field weakening control in which efficiency deteriorates is not performed unnecessarily. For this reason, high-efficiency control of each operating state is realized when controlling the motor from low speed to high speed.
Description
Technical field
The present invention relates to a kind of aircondition, particularly relate to the control of electric motor for compressor.
Background technology
The conventional method that permanent-magnet synchronous electric motor is carried out variable-ratio control for example is disclosed in the following non-patent literature 1.
For the rotating speed that makes motor increases, need increase to be added to the frequency of motor and to increase voltage simultaneously from power converter.Owing to result from the induced voltage of stator and the angular speed of rotor increases pro rata, so the generation torque must apply the voltage higher than induced voltage for electric current is flowed.Therefore,, need to produce high-tension power converter, but exist the cost of power converter to increase and produce problem such as interference for high speed rotating.
On the other hand, synchronous motor is carried out the method that variable-ratio is controlled, the weak magnetic control system of using vector control is arranged as the voltage ground that does not change from power converter is supplied with.By because of flowing through the demagnetize effect that negative d shaft current produces, can suppress to be applied to the rising of the voltage of motor.As use this control, make its high speed rotating in can be in the voltage that will be added to motor is suppressed to predetermined scope.
(non-patent literature 1)
" electrician learns to do volume " the 594th page～the 596th page (February 20 calendar year 2001, the distribution of electric association)
The motor of compressor that drives air conditioner when heat load hour or equilibrium at room temperature by hundreds of right slowly running of turning left, in refrigeration rapidly or when heating rapidly by the high speed rotating operation of thousands of commentaries on classics.
Carry out the occasion of Motor Control so from low speed to high speed at needs, it is few to turn to the number of windings adjustment with motor at high speed under low-voltage.Yet, in the occasion that drives with same load, to compare with the motor that the number of windings is many, the motor current of less motor increases.For this reason, in the occasion of the efficient of having considered motor, the number of windings is increased reduce the rotating speed design point.
Yet,, as described in the prior art, need apply high voltage by the power transformation circuit of drive motor or use the weak magnetic control system that realizes by vector control for the Motor Control that the rotating speed design point is low arrives at a high speed.
Apply high-tension occasion by power transformation circuit at motor, when hope further improves speed, must form expensive circuit.Particularly be difficult at the additional expensive circuit of family expenses air conditioner.In addition, utilizing vector control to carry out the occasion of weak magnetic control system, as increasing the number of turns of motor winding, then to enter weak magnetic control system than low velocity, when negative d shaft current increased, the electric current that flows through in the winding of motor increased, and had the problem of the loss increase of motor.
Summary of the invention
The object of the present invention is to provide a kind of air conditioner, the motor of the kind of refrigeration cycle that is used for air conditioner when low speed controls to high speed, the generation that does not make the too much rising of cost suppress to lose.
In addition, at this moment, can provide, suppress the air conditioner of the decrease in efficiency of air conditioner by under each running status, controlling motor effectively.
In order to achieve the above object, aircondition of the present invention has and makes the motor that is configured to the compressor action in the kind of refrigeration cycle and DC converting is become to exchange the inverter that this motor is driven; Wherein, comprise the device of the DC voltage rising that makes above-mentioned inverter and above-mentioned motor is carried out vector control ground apply switching signal and can carry out the control device of weak magnetic control system at above-mentioned inverter.
In addition, in order to achieve the above object, aircondition of the present invention has to be made the motor that is configured to the compressor action in the kind of refrigeration cycle and DC converting is become to exchange the inverter that this motor is driven; Wherein, comprise the DC voltage rising that makes above-mentioned inverter device, to above-mentioned motor carry out vector control ground above-mentioned inverter apply switching signal and can carry out weak magnetic control system control device, and have precedence over this when the speed of above-mentioned motor is risen a little less than magnetic control system select the function of the device of the DC voltage rising that makes above-mentioned inverter.
Description of drawings
Fig. 1 is the circuit diagram of an embodiment of inverter of the present invention.
Fig. 2 is the control chart of an embodiment of inverter of the present invention.
Fig. 3 is the control chart of an embodiment of inverter of the present invention.
Fig. 4 is the control chart of an embodiment of inverter of the present invention.
Fig. 5 is the control chart of an embodiment of inverter of the present invention.
Fig. 6 is the control chart of an embodiment of inverter of the present invention.
Fig. 7 is the control chart of an embodiment of inverter of the present invention.
Fig. 8 is the figure of example of current waveform that an embodiment of inverter of the present invention is shown.
Fig. 9 is the figure of loss that an embodiment of inverter of the present invention is shown.
Figure 10 is the circuit diagram of an embodiment of inverter of the present invention.
Figure 11 is the circuit diagram of an embodiment of inverter of the present invention.
Figure 12 is the control chart of an embodiment of inverter of the present invention.
Figure 13 is the control chart of an embodiment of inverter of the present invention.
Embodiment
Fig. 1 is the figure that the form of implementation that the control device circuit of use in refrigeration system motor of the present invention constitutes is shown.In the figure, symbol 1 is a source power supply, and symbol 2 is the power factor improvement reactor, and symbol 3 is a rectifier diode, symbol 4 is the rectification circuit diverter switch, symbol 5,6,7 is smmothing capacitor, and symbol 8 is a current sense resistor, and symbol 9 is the input current magnetic test coil, symbol 10 is a rectifier diode, symbol 11,12 is the AD converter, symbol 13,14,15 is driver, and symbol 16 is an arithmetic processing apparatus, symbol 17 is the AD converter, symbol 18 is synchronous motor (a DC brushless motor), and symbol 19 is the three-phase inversion bridge circuit, and symbol 20 is a microcomputer, symbol 21,22,23,24 is resistance, symbol 25 is a comparator, and symbol 26 is the power supply zero-crossing detection circuit, and symbol 27 is a switch element, Vs is a source power supply, Is is the input power supply, and Vdc is a direct voltage, and Idc is a direct current, Sz is a crossover point signal, Sr is the switch switching signal, and PWM1 is the switch element drive signal of current transformer, and PWM2 is the switch element drive signal of inverter.
The following describes the action of this circuit.Alternating current Vs from source power supply 1 is transformed into direct current by rectifier diode 3 and smmothing capacitor 5,6,7.Supply with direct current to inversion bridge circuit 19, drive 6 switch elements that constitute inversion bridge circuit 19, DC motor 18 is carried out speed control by drive signal PWM2.This DC motor 18 is in compressor is contained in not shown confined chamber, and the rotational motion of DC motor 18 is transformed into the compressed action of compressing mechanism.By this compression cold-producing medium is compressed, it is flowed in kind of refrigeration cycle, thereby freeze, heat, dehumidify as air conditioner.
Switch full-wave rectifying circuits and voltage doubling rectifing circuit by rectification circuit diverter switch 4, with the occasion of high-speed driving motor, switch to voltage doubling rectifing circuit high voltage is applied to the DC side of inversion bridge circuit 19, will carry out the interchange that break-make obtains to this direct voltage and be added to motor.
The switch element that symbol 27 is used for current transformer, make the output short-circuit of rectification circuit 10 by drive signal PWM1, by with the combination of reactor input power supply Is being carried out shaping with 2 power factor improvements, improve the power factor, and the height of control direct voltage Vdc.Symbol 26 is for generating the circuit of power supply crossover point signal, carries out dividing potential drop by two terminal circuits of 21,22,23,24 couples of power supply Vs of resistance, voltage after partial is input to comparator 25 compare, thereby generates every the anti-phase crossover point signal Sz of mains half-cycle.Crossover point signal Sz is in microcomputer 20 references, corresponding to the anti-phase moment output drive signal PWM1 of crossover point signal Sz.These parts are formed the 1st power transformation circuit that is transformed into alternating current from direct current.Symbol 9 is the coil of the size that detects input power supply Is, detects the switching condition etc. that the value that obtains is used for rectification circuit diverter switch 4 by AD converter 17.
Direct voltage Vdc is detected by AD converter 11, uses when the output voltage of control rectification circuit.Direct current Idc detects reference when motor is carried out vector control by AD converter 12.The inversion bridge circuit of symbol 19 for being made of 6 switch elements drives DC motor 18 by the drive signal PWM2 from microcomputer 20 outputs and rotates.With these parts as the 2nd power transformation circuit that is transformed into alternating current from direct current.
Below, according to Fig. 2 the vector control computing is described.Symbol 31 is the computing of motor voltage equation, and symbol 32 is two-phase → three-phase transform operation, and symbol 33 is the phase bit arithmetic, symbol 34 is three-phase → two-phase transform operation, symbol 35 reproduces computing for phase current, and symbol 36 is two-phase → three-phase transform operation, and symbol 12,15,16 is identical with figure one.Id
*Be the instruction of d shaft current, f
*Be frequency instruction, Vd
*Be the instruction of d shaft voltage, Vq
*Be the instruction of q shaft voltage, θ is a voltage-phase, and Iu is a U phase motor current, and Iw is a W phase motor current, Iq is a q axle motor current, Id is a d axle motor current, and Iu ' is the previous value of Iu, and Iw ' is the previous value of Iw, Idc is at the current detecting direct current that flows in the resistance 8, Vu is a U phase motor voltage, and Vv is a V phase motor voltage, and Vw is a W phase motor voltage.
The following describes the content of vector control computing.Fig. 2 is for computing illustrates the figure of general computing block diagram as vector control.Vector control is according to the instruction of d shaft current, frequency instruction, calculate the pulse train that is added to the switch element that constitutes inversion bridge circuit 19, the control motor as the actual q shaft current of current feedback value.The calculating formula of each computing block diagram is shown in electrician and learns to do volume etc., so omit explanation.
20 motor voltage equation computing is according to d shaft current instruction Id
*, frequency instruction f
*, q axle motor current Iq calculates d shaft voltage instruction Vd
*, q shaft voltage instruction Vq
*22 phase bit arithmetic is and frequency instruction f
*Make the motor voltage phase place leading pro rata, calculate the instantaneous value of motor voltage phase place, store θ into.21 two-phase → three-phase transform operation is that the reference voltage phase theta is from d shaft voltage instruction Vd
*, q shaft voltage instruction Vq
*Calculate U phase motor voltage Vu, V phase motor voltage Vv, W phase motor voltage Vw.It is to read in current detecting with the direct current Idc that flows in the resistance 8 by AD converter 12 that 24 phase current reproduces computing, calculates U phase motor current Iu, W phase motor current Iw.23 three-phase → two-phase transform operation is to calculate q axle motor current Iq, d axle motor current Id according to U phase motor current Iu, W phase motor current Iw.25 two-phase → three-phase transform operation is to calculate Iu previous value Iu ', Iw previous value Iw ' with reference to electronic phase theta from q axle motor current Iq, d axle motor current Id.Iu previous value Iu ', Iw previous value Iw ' can not reproduce the occasion that phase current is reproduced in computing by 24 phase current, are used for the last time calculated value of phase current is replaced by this value.Corresponding is the occasion of purpose with the high efficiency, or runs at high speed occasion into purpose etc., adjusts the electric current of q axle respectively.
For example, in the occasion that runs at high speed DC motor 18, flow through the rising that demagnetize effect that negative d shaft current produces can suppress to be added to the voltage of motor by weak magnetic control system utilization.By using this control, the voltage that is added to motor can be suppressed in the scope of regulation, can make its high speed rotating simultaneously.
Below, have the power factor improvement control function of improving power factor (PF), that alternating current is transformed into galvanic the 1st power transformation circuit according to Fig. 3 explanation.Ts represents power cycle, Vs represents source power supply, Sz represents crossover point signal, PWM1 represents the switch element drive signal of current transformer, Is represents source current, and Pon represents that PWM1 switches to moment of connection from disconnection, and Poff represents to switch to from connection the moment of disconnection, t1 represent from crossover point signal S2 change the time be carved into the time of delay that PWM1 connects, t2 represents the time that PWM1 connects.With alternating current be transformed into galvanic power transformation circuit by rectifier diode 10 shown in Figure 1, switch element 27, and power factor improvement reactor 2 constitute.Switch element 27 is a short circuit current, when the phase place of supply voltage is connected the drive signal PWM1 of switch element 27 during for Pon, when the phase place of supply voltage disconnects PWM1 during for Poff.By changing the phase place of this Pon and Poff, can carry out shaping to the waveform of input power supply Is, simultaneously, by boosted switch action the carrying out control of direct voltage Vdc.
Microcomputer 20 is a benchmark with crossover point signal Sz, setting-up time t1 and t2, thus make in drive signal PWM one phase place Pon connection, disconnect at phase place Poff.When enlarging time t2, the time that switch element is connected is elongated, and simultaneously, the time that short circuit current flows is elongated.Though short circuit current flows through power factor (PF) is improved, when making t2 long, the peak value of short circuit current extends, and produces problems such as overcurrent, so, adjust in suitable scope.In addition, by short circuit current flow, input electric power increases, so, can be to the direct voltage Vdc control of boosting.
Below, illustrate according to have the power factor improvement function, alternating current is transformed into galvanic power transformation circuit and have synchronous motor power transformation circuit vector control function, that direct current is transformed into alternating current action and DC motor is carried out the method for speed control.Fig. 4 illustrates the control model of DC motor and the relation of each control signal and controlled quentity controlled variable.Control model has 0～3 totally 4 kinds.To various patterns, control d shaft current instruction Id
*, direct voltage Vdc, switch switching signal Sr, current transformer switch element drive signal PWM1.Is switches each pattern with reference to the input power supply.
According to Fig. 8 selecting of input current Is1 is described here.Ts represents the cycle of supply voltage.Not carrying out the waveform of input power supply Is of the occasion of power factor improvement control is represented by a and b.Along with the increase of input current, it is tip-shape as the rolling country from the waveform of a to b the peak value of electric current to be become, and power factor (PF) descends.In addition, because square being directly proportional of the circuit loss that causes of electric current and current value, so the peak value of electric current extends makes increasing of losing.Therefore, by carrying out alternating current is transformed into the switch motion of galvanic power transformation circuit, improve power factor (PF) as the waveform of c, suppress the peak value of electric current, the waveform of b reduces the loss of the waveform of c relatively.On the other hand, by carrying out switch motion, lose at switch element 27.Therefore, amount that the peak value that suppresses input current is reduced the loss and the loss that produces by switch comprehensive, the loss increase and decrease of decision-making circuit.
Here, relatively carry out the occasion of switch and do not carry out the loss of the occasion of switch according to Fig. 9.Solid line d illustrates the circuit loss of the occasion of not carrying out switch, and dotted line e illustrates the loss of the occasion of carrying out switch motion.In the less occasion of input power supply Is, because the peak value of electric current is little, so the inhibition effect of the current peak that switch motion produces is little.On the other hand, because switch motion causes loss occurrence, so for the circuit loss of integral body, the e that carries out switch motion is bigger than the d that does not carry out switch motion sometimes.When input power supply Is increased, the occasion of peak value that is suppressed electric current by switch was more obvious with the efficient difference of occasion that is not such situation, and the e that carries out switch motion more can suppress to lose than the d that does not carry out switch motion.Therefore, be benchmark profit distribution model n and pattern n+1 with the Is of regulation, make and lose that the lowland that becomes more is divided into the occasion of carrying out switch motion and the occasion of not carrying out switch motion controlled.Like this, can make to be the loss shown in the solid line d, be the loss shown in the dotted line e at pattern n+1 at pattern n.The input power supply Is1 of mode boundary by the actual measurement occasion of not carrying out switch motion suitable with solid line d loss and the loss of carrying out occasion of the switch motion suitable with dotted line e obtain.Because may there be the occasion that solid line d and dotted line e intersection do not take place with the different of circuit formation and circuit constant, so, be fixed as the pattern of loss in such occasion than a low side.
The loss of full-wave rectifying circuit and voltage doubling rectifing circuit here, is described according to Figure 10 and Figure 11.Figure 10 is a full-wave rectifying circuit, and Figure 11 is the formation of voltage doubling rectifing circuit.In the full-wave rectifying circuit of Figure 10, because 4 disconnections of rectification circuit diverter switch, so input power supply Is flows the formation that flows in 2 diodes of being everlasting when becoming source current by the combination of rectifier diode 3c and 3b or 3a and 3d.In the voltage doubling rectifing circuit of Figure 11, because switch 4 closures, so input power supply Is flows the formation that flows in 1 diode of being everlasting when becoming source current by the combination of rectifier diode 3a or 3c.Identical as the loss that is produced by each diode, then the number of diodes that electric current flows under the situation of Figure 10 is 2 times, so the diode loss also is 2 times.Therefore, the loss of full-wave rectification is big.On the other hand, the low occasion of direct voltage Vdc that is lost in of DC motor is low loss sometimes.Can consider such occasion, promptly, as direct voltage Vdc height, then interrupted current amplitude broadens by each PWM break-make of motor current, because of making the iron loss of motor, eddy current etc. increases, in addition, the current peak of each PWM break-make of motor current extends increases copper loss, thereby motor loss is increased.Therefore, for the comprehensive loss that comprises circuit loss and motor loss, the increase and decrease of the resultant effect of the circuit loss that reduces by switching to voltage multiplying rectifier and the motor loss of increase decision comprehensive loss from full-wave rectification.As use Fig. 9 illustrates in front, be that benchmark profit distribution model n and pattern n+1 make and lose more that the lowland is divided into full-wave rectification and voltage multiplying rectifier ground is controlled with the Is of regulation.The input power supply Is2 of mode boundary during by the actual measurement full-wave rectification suitable with solid line d loss and the loss the during voltage multiplying rectifier suitable with dotted line e obtain.Because along with circuit constitutes and intersecting of solid line d and dotted line e may not take place for circuit constant different, so, in such occasion, be fixed as the pattern of losing a low side.In addition and since direct voltage Vdc when being alap value comprehensive loss low, so Vdc2 is set at alap value in the scope that power factor (PF) may improve.In fact, be made as the value that adds some bucking voltages acquisitions at full-wave rectified voltage Vdc1.Equally, Vdc3 is set at alap value in the scope that power factor (PF) may improve.In fact, be made as the value that adds some bucking voltages at voltage multiplying rectifier voltage.
Below, be transformed into the voltage modulated degree of power converting circuit of alternating current and the switching of pattern from direct current according to Fig. 5 explanation.In Fig. 4, source current Is has been illustrated the switching of each pattern as determinating reference, but in Fig. 5, the content of each pattern is with identical in content illustrated in fig. 4, but with the switching determination benchmark of voltage modulated degree khv1 as each pattern.From pattern 0 to pattern 1 switching and from pattern 1 to pattern 2 switch in when voltage modulated degree khv1 reaches the maximum khv1 (max) of regulation and switch.In addition, at mode 3, voltage modulated degree khv1 begins weak magnetic control system when reaching the maximum khv1 (max) of regulation.
Here, according to Figure 12 account for voltage modulation degree and weak magnetic control system.Figure 12 is illustrated in the internal signal waveforms that forms PWM1 in the microcomputer 20, and Vu, Vv, Vw are the sine voltage signal of each phase of motor, and Vc is a make-and-break signal, by comparing Vu, Vv, Vw and Vc, obtains the pwm signal of each phase.The amplitude alpha of the amplitude of pwm signal and Vu, Vv, Vw is proportional.As the maximum that makes amplitude is β, and then voltage modulated degree khv1 is α shared ratio in β.When α reached the value identical with β, khv1 was 100%, and the voltage to motor is further risen.Therefore, when the voltage modulated degree is 100%,, use weak magnetic control system for the speed that makes motor rises.
The loss of weak magnetic control system and motor here, is described according to Figure 13.The voltage vector of DC motor shown in the figure, Vm are motor voltage, and ω is a rotating speed, L is the inductance value of winding, r is a winding resistance, and E0 is an induced voltage, and Iq is the q shaft current, Id is a d axle circuit, Im is a motor current, and φ is q axle and Im angulation, and δ is q axle and Vm angulation, q is the q axle, and d is the d axle.The voltage that produces in the winding of motor is ω LIm, the rIm of active component, the E0 of induced voltage part of inductive part, and the total of these voltage vectors becomes the terminal voltage of motor.In the occasion of carrying out weak magnetic control system, Id is controlled to be negative value with the d shaft current.The vector of Iq and Id and be Im, the r Im of voltage vector is parallel with Im, but as to make Id be the value of bearing, make the relative E0 angulation of Vm δ enlarge ground control, the demagnetize effect that produces in the time of then can being flowed by negative d shaft current suppresses to be added to the rising of the voltage Vm of motor.As use this control, then can when being suppressed in the scope of regulation, the voltage Vm that will be added to motor make its high speed rotating.In the occasion of not carrying out weak magnetic control system,, can carry out speed control by d shaft current Id is controlled near 0 with reducing the loss, and in the occasion of carrying out weak magnetic control system, increase as negative d shaft current, then the electric current that flows in the winding of motor increases, and the loss of motor increases.Therefore,, set operational mode as described above, do not carry out weak magnetic control system ground as far as possible direct voltage Vdc suitably is controlled to be Vdc1, Vdc2, Vdc3 in order to carry out the good operation of efficient.
From pattern 0 to the transfer of pattern 1, from pattern 1 to the transfer of pattern 2, carry out according to the maximum that voltage modulated degree khv1 becomes regulation to the transfer of mode 3 from pattern 2.The program of vector control is compiled to begins weak magnetic control system when voltage modulated degree khv1 becomes the maximum of regulation.For example, considering from the occasion of pattern 1 to the transfer of pattern 2, when voltage modulated degree khv1 reaches the maximum of regulation, the weak magnetic control system of beginning under this state.The operation that weak magnetic control system increases for motor loss as described above.Therefore, also do not wish to drop into weak magnetic control system here.This is because this pattern 1 also stays and reaches means at a high speed effectively.That is, here,, do not carry out weak magnetic control system and can obtain higher speed effectively by switching to voltage multiplying rectifier from full-wave rectification.
That is, as the consideration method of the control of present embodiment, in present PWM control, in the time can not making the further high speed of motor, in the occasion that can make the means of motor high speed except that weak magnetic control system for also remaining time, magnetic control system is selected other means a little less than having precedence over.For example, in pattern 0, voltage modulated degree khv1 reaches the maximum of regulation, occasion in the expectation more speed, become means at a high speed as the motor that makes outside the weak magnetic control system, also stay the means of the DC voltage rising that makes inverter, wherein, make switch element 27 carry out PWM control in addition and drop into switch S r and switch to the such 2 kinds of means of voltage multiplying rectifier from full-wave rectification.In this occasion, preferential selection makes switch element 27 carry out the occasion of PWM control.Thereby it is also identical with the consideration mode of the occasion of switch element to be provided with the PAM that makes dc-side short-circuit improve direct voltage.
In other words, in the present embodiment, as the speed rising means of motor, thereby when existence made the direct current drive rising make the means of electromotor velocity rising make the means of electromotor velocity rising with the weak magnetic control system of input, the selection of magnetic control system made the means of DC voltage rising a little less than having precedence over.Like this, can speed be risen.
More than, in Fig. 4, illustrated with reference to input power supply Is the switching of the operational mode that reference voltage modulation degree khv1 does not raise the efficiency to be described with not carrying out weak magnetic control system as far as possible in Fig. 5 by the switching of switching the operational mode of raising the efficiency with the corresponding operational mode of load.The following describes the method for motor being carried out speed control by the switching of making up these 2 operational modes.Fig. 6 is the transition diagram in Fig. 4 and operational mode illustrated in fig. 5.Fig. 7 is in the jump condition of operational mode shown in the chart.Symbol shown in Figure 6 1., 2., 3., 4., 5., 6., 7. the symbol with Fig. 7 is corresponding.In Fig. 6, to start with, operational mode is switched to mode 3 from pattern 0 during with motor starting corresponding to running status.The switching condition of each pattern by symbol 1.～7. illustrate.For example, the condition that switches to 1 occasion from pattern 0 is for 1., and the condition that switches to 0 occasion from pattern 1 is for 2..The occasion of restarting after motor is stopped to bring into operation from pattern 0.The condition that switches to pattern 1 from pattern 0 for illustrated in fig. 4 from pattern 0 switch to 1 condition with in any occasion that conforms to that switches to from pattern 01 the condition illustrated in fig. 5.From pattern 1 switch to 2 switching condition for illustrated in fig. 4 from pattern 1 switch to 2 condition with in any occasion that conforms to that switches to from pattern 12 the condition illustrated in fig. 5.3 the condition of switching to from pattern 2 is identical with the condition of Fig. 4 explanation.From pattern 1 switch to 0 condition for the switching to occasion that 1 condition do not conform to and with illustrated in fig. 5 do not switch to the occasion that 1 condition conforms to of Fig. 4 explanation from pattern 0 from pattern 0.Switch to 1 switching condition for not switching to occasion that 1 condition conforms to and with illustrated in fig. 5 do not switch to the occasion that 1 condition conforms to from pattern 2 from pattern 2 from pattern 2 with illustrated in fig. 4.The occasion of condition from mode 3 switching 2 for not conforming to the condition of Fig. 4 explanation.By carrying out the setting of mode switch condition like this, transform to galvanic the 1st power transformation circuit from alternating current, do not lower efficiency and the condition of power factor (PF) and the 2nd power transformation circuit that transforms to alternating current from direct current, do not carry out the condition that weak magnetic control system is raised the efficiency as far as possible thereby can satisfy simultaneously, can carry out the operation of the good DC motor of efficient.
According to present embodiment, have the 1st power transformation circuit and the 2nd power transformation circuit, the 1st power transformation circuit has the device of being controlled the waveform of input current by the switch motion of the 1st switch element with improving power factor (PF), the 2nd power transformation circuit has the d that calculates orthogonal on the rotator seat parameter according to motor current, the motor current of q axle, d according to orthogonal, the device of each current instruction value of q axle and frequency instruction value output AC electricity, in the DC-to-AC converter of the synchronous motor that constitutes by these devices, above-mentioned the 1st power transformation circuit reaches predetermined setting at input current and carries out the switch motion of the 1st switch element when above, be in predetermined setting when following at input current, stop the switch motion of the 1st switch element, perhaps, above-mentioned the 1st power transformation circuit reaches predetermined setting at the voltage modulated degree that transforms to alternating current from direct current of above-mentioned the 2nd power transformation circuit and carries out the switch motion of the 1st switch element when above, be in predetermined setting when following at the voltage modulated degree, stop the switch motion of the 1st switch element, so, can be suppressed at the power loss that takes place in the power transformation circuit.
In addition, reaching switch motion that predetermined setting carries out the 1st switch element when above when input current, be in the occasion that switch motion ground that predetermined setting stops the 1st switch element when following is controlled when input current, with the value of the efficient of the occasion of carrying out switch motion or the power factor (PF) input current higher setting of being scheduled to as input current than the efficient of the occasion of not carrying out switch motion or power factor (PF); Perhaps, reach switch motion that predetermined setting carries out the 1st switch element when above, be in the occasion that switch motion ground that predetermined setting stops the 1st switch element when following is controlled when the voltage modulated degree when the voltage modulated degree that transforms to alternating current from direct current of above-mentioned the 2nd power transformation circuit at above-mentioned the 1st power transformation circuit, with the maximum of voltage modulated degree as predetermined setting, so, can suppress the power loss of power transformation circuit and motor.
In addition, the 1st power transformation circuit has the device that rectification circuit is switched to full-wave rectifying circuit and voltage doubling rectifing circuit, in the time will importing power converter and become direct current, be in occasion more than the predetermined setting at input current, rectification circuit is switched to voltage doubling rectifing circuit, be in occasion below the predetermined setting at input current, rectification circuit is switched to full-wave rectifying circuit; Perhaps, rectification circuit switched to voltage doubling rectifing circuit, be in occasion below the predetermined setting at the voltage modulated degree and rectification circuit is switched to full-wave rectifying circuit ground control because above-mentioned the 1st power transformation circuit reaches occasion more than the predetermined setting at the voltage modulated degree that is transformed into alternating current from direct current of above-mentioned the 2nd power transformation circuit, so, can suppress the power loss of power transformation circuit and motor.
In addition, the 1st power transformation circuit is when switching to rectification circuit on full-wave rectifying circuit ground and control, become galvanic value to become the switch motion control input electric power of predetermined setting ground the input power converter by the 1st switch element, and with the value of the highest direct voltage of efficient or power factor (PF) as predetermined setting, so, can suppress the power loss of power transformation circuit and motor.
In addition, in the time will importing power converter and become direct current, rectification circuit switched to when above voltage doubling rectifing circuit, be in the occasion that predetermined setting switches to rectification circuit when following full-wave rectifying circuit when input current being in predetermined setting when input current, efficient when switching to voltage doubling rectifing circuit or power factor (PF) when switching to full-wave rectifying circuit efficient or the value of the high input current of power factor (PF) as the predetermined setting of input current; Perhaps, rectification circuit switched to when above voltage doubling rectifing circuit when the voltage modulated degree that is transformed into alternating current from direct current of above-mentioned the 2nd power transformation circuit reaches predetermined setting, be in the occasion that predetermined setting switches to rectification circuit when following full-wave rectifying circuit when the voltage modulated degree at above-mentioned the 1st power transformation circuit, with the maximum of voltage modulated degree as predetermined setting, so, can suppress the power loss of power transformation circuit and motor.
In addition, the 1st power transformation circuit is when switching to rectification circuit on full-wave rectifying circuit ground and control, become galvanic value to become the switch motion control input electric power of predetermined setting ground the input power converter by the 1st switch element, and, reach occasion more than the predetermined setting at the voltage modulated degree that is transformed into alternating current from direct current of above-mentioned the 2nd power transformation circuit, make the d of orthogonal on the rotator seat parameter of above-mentioned motor, the current instruction value increase and decrease of the d axle of q axle, the output of control motor, so, can suppress the power loss of power transformation circuit and motor.
In addition, when making when the input power converter become galvanic value to become predetermined setting ground to import electric power by the switch motion of the 1st switch element control, the value that becomes the highest direct voltage with efficient or power factor (PF) is as predetermined setting, and, reach occasion more than the predetermined setting at the voltage modulated degree that is transformed into alternating current from direct current of above-mentioned the 2nd power transformation circuit, as the d of orthogonal on the rotator seat parameter that makes above-mentioned motor, when the current instruction value of the d axle of q axle increases and decreases with the output of control motor, with the maximum of voltage modulated degree as predetermined setting, so, can suppress the power loss of power transformation circuit and motor.
According to the present invention, a kind of air conditioner can be provided, the motor of the kind of refrigeration cycle that is used for air conditioner when low speed controls to high speed, the generation that does not make the too much rising of cost suppress to lose.
In addition, at this moment, can provide, suppress the air conditioner of the decrease in efficiency of air conditioner by under each running status, controlling motor effectively.
Claims (8)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002267546A JP3971979B2 (en) | 2002-09-13 | 2002-09-13 | Air conditioner |
| JP267546/2002 | 2002-09-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1482734A true CN1482734A (en) | 2004-03-17 |
| CN1255933C CN1255933C (en) | 2006-05-10 |
Family
ID=32089111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031427227A Expired - Fee Related CN1255933C (en) | 2002-09-13 | 2003-06-11 | Air-conditioning apparatus |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3971979B2 (en) |
| KR (1) | KR100564193B1 (en) |
| CN (1) | CN1255933C (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20040024447A (en) | 2004-03-20 |
| CN1255933C (en) | 2006-05-10 |
| KR100564193B1 (en) | 2006-03-27 |
| JP3971979B2 (en) | 2007-09-05 |
| JP2004101151A (en) | 2004-04-02 |
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