CN100361384C - Inverter device integrated electric compressor - Google Patents
Inverter device integrated electric compressor Download PDFInfo
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- CN100361384C CN100361384C CNB2003801053650A CN200380105365A CN100361384C CN 100361384 C CN100361384 C CN 100361384C CN B2003801053650 A CNB2003801053650 A CN B2003801053650A CN 200380105365 A CN200380105365 A CN 200380105365A CN 100361384 C CN100361384 C CN 100361384C
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- 238000004378 air conditioning Methods 0.000 description 2
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Abstract
An inverter device which is low in noise and vibration, small in size and weight, and high in reliability, wherein a current sensor for detecting a power supply current is also used for detecting the current of a stator winding to detect the position of a magnet rotor, whereby a sinusoidal drive is enabled without additionally providing two phase current detecting current sensors, and a conventional phase shift circuit/comparison circuit at 120-degree conduction is made unnecessary to reduce the number of constituting components.
Description
Technical field
The present invention relates to drive controlling does not have the inverter of transducer dc brushless motor, in addition, also relates to such inverter is applied to the aircondition of no transducer dc brushless motor as the motor compressor of drive source.
Background technology
Carrying in the past the motor compressor of drive source as no transducer dc brushless motor, and the air conditioner for vehicles that has a DC power supply such as battery is that example describes.
Figure 20, the system of expression air conditioner for vehicles constitutes.In the figure, the 101st, supply air duct relies on the effect of indoor blowing fan 102 to suck air from air introducing port 103, will carry out heat-exchanged air at indoor heat converter 104 and blow in the car from air outlet 105.
The 111st, the inverter that the no transducer dc brushless motor as the drive source of above-mentioned motor compressor 106 is driven, with indoor blowing fan 102, four-way switching valve 107 and outdoor blowing fan 109, its action is controlled by air-conditioner controller 112.
Above-mentioned air-conditioner controller 112, for with the indoor blowing fan switch 113 of the starting of setting indoor air-supply/stop/strong and weak, select air conditioner switch 114, temperature regulation switch 115 and the vehicle control device of cold air/heating installation/stop to communicate, be connected with communication component 116.
In said system, for example, indoor blowing fan switch 113 place air-supply starting/a little less than, send the cold air instruction by air-conditioning switch 114, air-conditioner controller 112 just is set at four-way switching valve 107 solid line among the figure, and indoor heat converter 104 is played a role as condenser as evaporator, outdoor heat converter 110, outdoor blowing fan 109 is made as starting, a little less than indoor blowing fan 102 is made as.
In addition, according to temperature regulation switch 115, make the variable temperature of regulating indoor heat converter 104 of rotating speed of motor compressor 106 by adopting inverter 111.Then, be made as changes in temperature gas according to above-mentioned air conditioner switch 114 and stop, motor compressor 106, outdoor blowing fan 109 just become and stop.
In addition, if indoor blowing fan switch 113 is made as stop, indoor blowing fan 102 just is made as and stops, and motor compressor 106, outdoor blowing fan 109 also are set as because of cold recycling-guard and stop.
On the other hand, if from vehicle control device (do not have diagram), by communication component 116, receive the instruction that the changes in temperature gas because of reasons such as power extraction/battery protections stops, air-conditioner controller 112 just carries out stopping identical processing with the changes in temperature gas of air conditioner switch 114.
Figure 21, as an example of above-mentioned motor compressor 106 in the past, expression has been equipped with the motor compressor of no transducer dc brushless motor.
Among this figure, in metallic housing 32, be provided with compression mechanical part 28, motor 31 etc.
Cold medium sucks from suction inlet 33, and compression mechanical part 28 (this example is a turbine mechanism) is compressed by the driving of motor 31.Cold medium after this compression by motor 31, at this moment carries out the cooling of motor 31 in metallic housing 32, and discharges from outlet 34.In the inner terminal 39 that is connected with the coil of motor 31, be connected to the inverter 111 of Figure 20.
In the air conditioner for vehicles that has assembled such motor compressor, from the property of riding, to the vibration effect aspect of other machines, low noise, low vibration just become very important.Particularly electric automobile is not because there is engine, solemn silence is very high (in hybrid-electric car, under the situation that ato unit does not travel with motor), especially in parking, can drive motor compressor by battery supply, in this case, owing to the noise vibration that does not cause, so the noise vibration of motor compressor is just obvious all the more because of driving.
, adopting the step mode of the inverter 111 of motor compressor 106 in the past, is 120 degree step modes, and therefore, changes of magnetic field is the interval (energization interval 60 degree) of 60 degree.For example, with reference to patent documentation 1: the spy opens the 8th page in flat 8-163891 communique, the 4th figure.
Therefore, the cogging of the motor 31 of portion of drive compression mechanism 28 is very big, consequently is difficult to reduce noise, vibration.
Figure 22 represents to be equipped with inverter 111, and the circuit example of the constituting body that combines with the motor section of motor compressor.In the figure, the 121st, battery, the 122nd, switch element is used in the inverter action that is connected to battery 121, and the 123rd, inverter action diode.In addition, the stator coil of 124 expression motors, the magnet rotor of 125 expression motors.And, the 126th, current sensor is used to detect source current, carries out the device of consumed power calculating/switch element protection etc.The 127th, be used for from the phse conversion circuit of the position of the voltage detecting magnet rotor 125 of stator coil 124, the 128th, identical comparison circuit.And 129 be according to from the signal of current sensor 126, comparison circuit 128 etc., the control circuit that switch element 122 is controlled.
On the other hand, under the situation of sine wave drive, owing to drive permanent magnet rotor by continuous rotating magnetic field, so the change of torque is little.Therefore, it is preferred adopting the sine wave drive inverter of sine wave output electric current.But, when detecting the position of permanent magnet rotor,, adopt 2 current sensors in order to detect the electric current of stator coil.For example, with reference to patent documentation 2: the spy opens the 9th page of 2000-333465 communique, the 2nd figure.
Figure 23 has represented to be equipped with the other circuit example of inverter 111.With the constituent ratio of Figure 22 of front, circuit 128 phse conversion circuit 127 without comparison, but be provided with U phase current detection flow sensor 130, the W phase current detection flow sensor 131 that is used for going out the position of magnet rotor 125 from the current detecting of stator coil.Control circuit 129, (current sensor needs 2 according to the electric current that calculates other 1 phase from the current values of 2 phases of above-mentioned two current sensors, but, any two-phase of U phase V phase W in mutually can), carry out the position probing of magnet rotor 125, according to Signal-controlled switch element from current sensor 126 grades.
Because with above-mentioned U phase current detection flow sensor 130, W phase current detection flow sensor 131, be provided in by conducting by and apply the voltage of battery 121, thereby current potential is on the output line of the often inverter of change, so need to use the optical coupler etc. that carries out the signal transmission to control circuit 129.For this reason, the formation complexity of used current sensor can not constitute the simple structure that shunt resistance is only arranged.
In addition, except the low vibration of above-mentioned low noise, from guaranteeing the aspect of assembling travelling, air conditioner for vehicles needs small portable.
As described above, adopt the sine wave drive inverter of sine wave output electric current, has the advantage that the torque of making diminishes, but structure in the past shown in Figure 23, in order to detect the position of magnet rotor, need two current sensors, thereby have the problem that forms obstruction as air conditioner for vehicles to miniaturization and development aspect.
In addition, above-mentioned miniaturization and is not limited to vehicle usefulness, also is the same in room air conditioner etc., and small-sized light weight is that the miniaturization Design aspect that influences machine is pursued.
Summary of the invention
The objective of the invention is to solve so in the past problem, the inverter of small-sized light weight is provided in low noise, low vibration.
In addition, the purpose of this invention is to provide a kind of aircondition, it has disposed the low vibration of this low noise motor compressor that carries integratedly of the inverter of small-sized light weight again simultaneously.
In order to solve above-mentioned problem, the present invention will detect the current sensor of source current, also is used to detect the electric current of stator coil, carries out the position probing of magnet rotor.
Promptly, the inverter that the 1st mode of the present invention is relevant, it is the inverter that is used to drive no transducer dc brushless motor, it is characterized in that, have: inverter circuit, it exports to sinuous alternating current the no transducer dc brushless motor with three fixed coils that are connected and magnet rotor by carrying out switch control with three-phase modulations from the direct voltage that DC power supply obtains; Current detecting mechanism, it detects the electric current between above-mentioned DC power supply and the above-mentioned inverter circuit, in carrier cycle, to adding during all energisings of said stator coil three-phase or deducting same conduction time, by above-mentioned current detecting mechanism, detection flows to the electric current of said stator coil, judges the position of above-mentioned magnet rotor, controls the switch of above-mentioned inverter circuit.
Here, inverter, preferably with 3 phase modulation systems to the direct voltage of DC power supply and carry out the structure of switch.
And, preferably 3 mutually in the carrier cycles of modulation, also can be during the energising of each phase of stator coil, to same energising regularly carry out addition or subtraction.
In addition, inverter, preferably, in carrier cycle, energising that also can each phase of transfer pair stator coil regularly detects the electric current that flows to stator coil by current detecting mechanism and constitutes.
In addition, inverter of the present invention, also can be applicable to vehicle boarded in.
And inverter of the present invention when no transducer dc brushless motor is the power source of compressor, also is applicable to drive this brushless electric machine.
According to the present invention, two phase current detection flow sensor need not be appended and just sine wave drive can be carried out, in addition, phse conversion circuit, the comparison circuit of 120 degree energisings had not needed yet in the past, its result, since reduced component parts, thus small-sized light weight in low noise, low vibration can be obtained, and have the high inverter of reliability.
In addition,, can reduce noise more, reduce vibration the structure that the direct voltage from DC power supply carries out switch control with 3 phase modulation systems.
In addition, in carrier cycle, by the formation that conversion is regularly carried out in the energising of each phase of stator coil of no transducer dc brushless motor, can detect the position in each carrier wave, and adjustment is to the output of stator coil, its result makes cogging very little, thus can be accomplished the inverter of low noise, low vibration.
The aircondition that the 2nd execution mode of the present invention is relevant is to be feature with the inverter that has assembled above-mentioned the 1st execution mode.
Above-mentioned aircondition preferably, also can become one inverter and no transducer dc brushless motor with compressing mechanism.
In the structure of above-mentioned and compressor one, aircondition preferably, also goes for compressor, has the suction pipe that sucks the cold medium that is used to cool off inverter.
In addition, inverter also can be configured between the below or suction pipe and compressor of suction pipe.
According to the 2nd execution mode of the present invention,, so comprise inverter circuit portion, inverter can be cooled off, and guarantee the reliability of inverter owing to become one with compressing mechanism.
In addition, can in current sensor, use shunt resistance, need not append two phase current detection flow sensor, just can carry out sine wave drive, in addition, constitute parts and reduce owing to the phse conversion circuit, the comparison circuits that do not need in the past 120 degree energisings make, thus can receive produce that low noise, low vibration are small-sized simultaneously, light weight and have the effect of the high inverter of reliability.
In addition, owing to carry out the driving of compressor with low noise, low vibration, and also small-sized light weight and vibration resistance reliability height are so for example, it is suitable to for motor vehicle inverter to obtain.
And, by 3 phase modulation switchs, can make every effort to low noise, low vibration more.
In addition, by structure, eliminated (minimizing) and can only detect the situation of 1 phase, thereby can play the effect of further raising position probing in carrier wave inner conversion energising.
And in 3 modulated mutually, 3 of stator coil can detect mutually together, calculated thereby need not carry out electric current mutually to remaining after detecting 2 phases.
In addition, the present invention, in 3 modulated mutually, by the energising together mutually of 3 in the carrier wave, the formation that adds deduct had been eliminated the situation that can only detect 1 phase, thereby can play the effect of further raising position probing.
In addition, the present invention can also realize the inverter small-sized, that reliability is high, the effect of motor-integrated compressor.
Effect of the present invention, owing to be small-sized light weight and the high inverter of vibration resistance reliability, in the time of on using the Vehicular air-conditioning apparatus be equipped with motor compressor,, also can guarantee to comprise the reliability of the control device of inverter even to the distinctive vibration of vehicle.
Description of drawings
Fig. 1 is the electrical circuit diagram that has been equipped with the inverter shown in the 1st enforcement state of the present invention.
Fig. 2 is the key diagram of induced voltage detection method under the sine wave drive situation in this electric circuit.
Fig. 3 is the oscillogram that is illustrated in the electric current and voltage of the no transducer dc brushless motor in this inverter.
Fig. 4 is illustrated in maximum percentage modulation that 2 in this inverter modulate the mutually oscillogram 50% o'clock each phase modulation degree.
Fig. 5 is illustrated in maximum percentage modulation that 2 in this inverter modulate the mutually oscillogram 100% o'clock each phase modulation degree.
Fig. 6 is illustrated in maximum percentage modulation that 3 in this inverter modulate the mutually oscillogram 50% o'clock each phase modulation degree.
Fig. 7 is illustrated in maximum percentage modulation that 3 in this inverter modulate the mutually oscillogram 100% o'clock each phase modulation degree.
Fig. 8 is the energising timing of the relevant phase current detection method of expression the 1st execution mode of the present invention
Fig. 9 is illustrated in the regularly electrical circuit diagram of the current path in (a) of energising that in-phase current detects.
Figure 10 is the electrical circuit diagram that is illustrated in middle current path of energising timing (b) of in-phase current detection.
Figure 11 is the electrical circuit diagram that is illustrated in middle current path of energising timing (c) of in-phase current detection.
Figure 12 is the key diagram that the 2 relevant phase currents of modulating mutually of expression the 1st execution mode of the present invention detect.
Figure 13 is the key diagram that the 3 relevant phase currents of modulating mutually of expression the 1st execution mode of the present invention detect.
Figure 14 is the key diagram that the 2 relevant phase currents of modulating mutually of expression the 2nd execution mode of the present invention detect.
Figure 15 is the key diagram that the 3 relevant phase currents of modulating mutually of expression the 2nd execution mode of the present invention detect.
Figure 16 is the key diagram that the 3 relevant phase currents of modulating mutually of expression the 3rd execution mode of the present invention detect.
Figure 17 is the cutaway view of the relevant inverter electric compressor integral of expression the 4th execution mode of the present invention.
Figure 18 is the cutaway view of the inverter electric compressor integral of other examples of the present invention.
Figure 19 is the cutaway view of the inverter electric compressor integral of other examples in addition of the present invention.
Figure 20 is the system's pie graph that has assembled the air conditioner for vehicles of motor compressor in the past.
Figure 21 is a motor compressor part partial sectional view in the past.
Figure 22 is that 120 degree energisings in the past drive the circuit diagram with the inverter combination.
Figure 23 is the circuit diagram that is equipped with the inverter combination that the sine wave drive of in-phase current detection flow sensor in the past uses.
Embodiment
With reference to the accompanying drawings embodiments of the present invention are described.Yet the present invention is not limited to this execution mode.
(execution mode 1)
Fig. 1 represents the circuit diagram of present embodiment.In the figure, the 1st, battery, the 2nd, the inverter that is connected with battery 1 move with switch element, the 3rd, inverter action diode.In addition, the magnet rotor of the stator coil of 4 expression motors, 5 these motors of expression.And, the 7th, according to from as the signal of current detecting mechanism current sensor 6 and the control circuit of control switch element.The 37th, inverter circuit, the 20th, inverter, the 31st, motor.
If the circuit diagrams that the 120 degree energisings of the circuit diagram of Fig. 1 and Figure 22 are driven usefulness compare, among the represented figure of execution mode 1, do not need comparison circuit 128, phse conversion circuit 127 here.
In addition, if the circuit diagram of Fig. 1 is compared with the circuit diagram that Figure 23 is equipped with the sine wave drive of phase current detection flow sensor to use, among the represented figure of execution mode 1, do not need U phase current detection flow sensor 130, W phase current detection flow sensor 131.
The detection current values of above-mentioned current sensor 6 sends control circuit 7 to, is used for the judgement of protection such as consumed power compute switch element 2 grades, also is used to detect the position of magnet rotor 5.
Thereby, in the control circuit 7 of present embodiment 1, do not need the comparison circuit 128, phse conversion circuit 127, the U phase current detection flow sensor 130 of Figure 23, the signal input circuit (hardware) of W phase current detection flow sensor 131 usefulness of Figure 22, the change of only carrying out program software is just passable.
Then, also according to rotary speed instruction signal (do not have diagram) etc., control switch element 2.As current sensor 6, can use the transducer that adopts Hall element or shunt resistance etc., as long as can detect from the peak value of the switching current of switch element 2 just passable.
Particularly, adopt shunt resistance, compare just resistance itself with the transducer that adopts Hall element, because the Hall element that not should be noted that at aspects such as vibrations, so can improve reliability.To this, the U phase current detection flow sensor 1 30 of Figure 23 in the past, W phase current detection flow sensor 131 etc. since with the U of potential change mutually, the efferent that equates of W connects, and adopts shunt resistance just can not improve reliability.
And current sensor 6 is for protection switch element 2 etc., because can detect the peak value of switching current, so can directly use.
Moreover in Fig. 1, current sensor 6 inserts the negative pole of power line, but also electric current can be located at positive pole equally.By such structure, because formation parts compared with the past have reduced, thus can be when making every effort to small-sized light weight, can also improve anti-reliability of shaking etc.Particularly, current sensor etc. are because be to be assemblied on the printed circuit board (PCB), so the anti-aspect that shakes becomes the consideration emphasis, but the structure by present embodiment just can improve resistance to vibration.
Secondly, according to Fig. 2 the method for detecting position of magnet rotor 5 is described.
This figure is illustrated in the related of U phase phase current and induced voltage.Induced voltage is owing to be that rotation by magnet rotor shown in Figure 15 is to the induced voltage of stator coil 4, so can be used for the position probing of magnet rotor 5.
In the stator coil 4 of Fig. 1, also there is resistance R with inductance L.The voltage sum of the voltage of induced voltage, inductance L, resistance R equates with applied voltage from inverter 20.With induced voltage as EU, phase current as iU, applied voltage as VU, applied voltage VU, VU=EU+RiU+LdiU/dt.By the way, Fig. 3 represents not have the example of 1 phase of the electric current and voltage of transducer dc brushless motor.Therefore, induced voltage EU is represented by EU=VU-RiU-LdiU/dt.
Because the control circuit 7 of Fig. 1, control switch element 2 is so applied voltage VU is known.Thereby, if, just can calculate induced voltage EU by measuring phase current iU to the program software of control circuit 7 value of input inductance L and resistance R in advance.
Below, at current sensor 6, narrate at the method for measuring magnet rotor 5 positions.
At first, modulation, 3 phase modulated waveform describe mutually for 2.Fig. 4 represent maximum modulation 50% 2 mutually the modulation, Fig. 5 represent maximum modulation 100% 2 mutually the modulation, Fig. 6 represent maximum modulation 50% 3 mutually the modulation, Fig. 7 represent maximum modulation 100% 3 mutually the modulation.
Represent neutral point voltages by 41 expression U phase terminal voltages, 42 expression V phase terminal voltages, 43 expression W phase terminal voltages, 29 respectively among the figure.2 modulation mutually, for along with the rising of modulation degree is extended to a direction of from 0% to 100%, 3 modulation mutually in contrast are along with the rising of modulation degree be the both direction extension of middle mind-set 0% and 100% with 50%.
Below, describe with circuit diagram.What Fig. 8 represented is an example of (carrier cycle) upper arm switching element U, V, W, underarm switch element X, Y, Z energising in 1 carrier wave.In this case, in 2 mutually in the modulation of the maximum modulation 100% of Fig. 5, phase place is in 80 degree conductings substantially.As powered-on mode, (a) and (b), (c) 3 kinds of patterns are arranged.
In powered-on mode (a), upper arm switching element U, V, W all end, and underarm switch element X, Y, Z all are conductings.Fig. 9 represents flowing of electric current in this time.
Can be clear and definite by this figure, from flowing to stator coil 4 with underarm switch element X, Z diode arranged side by side, the V phase current is from stator coil 4 downward arm switch element Y outflows respectively for U phase current, W phase current.Thereby electric current does not flow in current sensor 6, can not measure.
In powered-on mode (b), upper arm switching element U is conducting, and underarm switch element Y, Z are conductings.Figure 10 represents flowing of electric current in this time.
Can be clear and definite by this figure, the U phase current flows to stator coil 4 from upper arm switching element U, and the W phase current is from flowing to stator coil 4 with underarm switch element Z diode arranged side by side, and the V phase current is from stator coil 4 downward arm switch element Y outflows.Thereby at current sensor 6, inflow U phase current is also measured.
In powered-on mode (c), upper arm switching element U, W are conductings, and underarm switch element, Y are conductings.Figure 11 represents flowing of electric current in this time.
Can be clear and definite by this figure, U phase current, W phase current, be respectively, flowing to stator coil 4 from upper arm switching element U, W, the V phase current flows out from stator coil 4 downward arm switch element Y.Thereby, at current sensor 6, flow into V phase current and detection.
Therefore, owing to can measure U phase current and V phase current, remaining W phase current is in the neutral point of stator coil 4, so owing to the electric current rule that is suitable for kirchhoff can be obtained.
In this case, because the U phase current is the electric current that flows into the neutral point of stator coil 4, the V phase current is the electric current from the neutral point outflow of stator coil 4, so just can obtain as long as the W phase current is got the difference of U phase current and V phase current.
Above current detecting because can carry out at each carrier wave, is measured the position of each carrier wave, so can adjust the output to stator coil 4.Thereby, to compare with 120 degree energisings, cogging is very little, can realize the motor-driven of low noise, low vibration.
Particularly in vehicle-mounted motor-driven, the control that requires miniaturization and, anti-shake reliability and low vibrationization, low noiseization to be correlated with suits as the drive controlling usefulness of vehicle mounted electric compressor, fan electromotor etc.
In above-mentioned execution mode 1, can determine by current sensor 6 detected phase currents in conducting, the cut-off state of upper arm switching element U, V, W as can be known.Can detect only has 1 mutually when the conducting, and the electric current of this phase, 2 remains the electric current of phase during mutually for conducting, but when 3 all are conducting mutually and do not have the phase time (all by time) of conducting then can not detect.Therefore, by confirming upper arm switching element U, the V in 1 carrier wave, the conducting of W, just can know the phase current that to measure.
In Figure 12, just can study the electric current of measuring with said method.In Figure 12,2 phase places of modulating mutually of top maximum modulation 100% are represented as horizontal in the modulation degree of-30 degree～30 degree, thereunder, with upper arm switching element U, the V of (carrier cycle) in 1 carrier wave of each phase place of its corresponding above-mentioned modulation degree, the conducting of W, show from central average mark game clock.
Moreover 41 expression U phase terminal voltages, 42 expression V phase terminal voltages, 43 are represented W phase terminal voltages in the figure.In addition, below this figure, represent by heavy line during the energising of W phase, represent by fine line during the energising of U phase.And, but but the V, the W that represent with arrow below during each energising represent respectively between the electric current detection period of V phase with W electric current detection period mutually between.
The words that are described in further detail, spend in phase place-30, because terminal voltage figure according to top each phase, U phase modulation degree is 0%, W phase modulation degree is 87%, so among the figure, 1 carrier wave (carrier cycle) as 100%, is shown the modulation degree (conduction time) 87% of W phase (heavy line) from central average mark game clock during the energising below.Other also are the same.
Here, why phase place is decided to be-30 the degree～30 the degree scopes, be by this waveform repeat form.Under this line, expression can be measured the phase of electric current.In phase place-30 degree is spent with 30, can only measure the electric current of 1 phase as can be known here.In this case, just need reuse the processing of the value measured last time etc., but have the problem of the accuracy of measuring the position.
Figure 13 represents the situation that phase place 30 degree～90 of 3 modulation of maximum modulation 100% are spent, but identical in 30 degree, 90 degree.Why be decided to be 30 the degree～90 the degree, be since this waveform repeat form.In addition, among the figure, be illustrated by the broken lines during the energising of V phase during the energising below in Figure 13, the U shown in the arrow represents during the measuring of U phase current.
(execution mode 2)
Secondly, at execution mode 2, describe with Figure 14 and Figure 15.Present embodiment 2 is processing methods of using the accuracy of measuring the position of Figure 12 explanation at above-mentioned execution mode 1 in order to improve.
Figure 14 is in Figure 12, the U that the energising when phase place 30 is spent is represented by fine line mutually left, the W that is represented by heavy line carries out conversion mutually to the right.Thus, be not only the V phase, the electric current of the electric current of U phase and W phase also can be measured.
Figure 15 is in Figure 13, the energising when phase place 30 is spent, and U is mutually left, W carries out conversion mutually to the right.Thus, the electric current of U phase just can both be measured with W electric current mutually.In addition, the energising when phase place 90 is spent, V is mutually left, W carries out conversion mutually to the right.
Thus, the electric current of V phase can both be measured with W electric current mutually.In phase place 50 degree, 70 degree,, also can measure the W phase by with V conversion significantly to the right mutually.Thereby, in 3 modulate mutually, can measure mutually with 3 of said method U, V, W, measuring the electric current calculating of all the other phases afterwards of 2 phases has not just needed.
In addition, specific in the above description phase place, but also particular phases not clearly.
Thereby, according to present embodiment, can improve measuring of position more.
(execution mode 3)
Below, 3 usefulness Figure 16 describe about execution mode.Present embodiment shown in Figure 16 is in order to improve in the above-mentioned execution mode 1 other countermeasure of the correctness of measuring the position that adopts Figure 12 explanation.
At first, describe at 3 effectiveness of modulating mutually.In order to reduce vibration, employing 3 modulation mutually is preferred.Because 3 modulation mutually, to the modulation range of phase range, chopping phase is than little mutually with 2, and sine-wave current is smooth, vibration is little.
In Fig. 8, when 3 modulate mutually, can append conduction period mutually to V.Thus, when 3 during of carrier cycle central portion U, V, W, because electric current can not flow to current sensor 6, so be when identical by identical (from which side power supply also not to the motor supply power) with 3 mutually together for conducting.Thereby, just become first half and latter half to separate supply power (modulation) with carrier cycle.Like this, with 2 chopping phase ratios mutually, show with carrier cycle half, two times of carrier frequency be identical.
Therefore, can be to the extremely careful smooth sine-wave current of motor supply.Thereby 3 modulate and 2 chopping phase ratios mutually mutually, can further reach the low vibration of low noise.
In Fig. 6, if each adds 20% mutually as an example, neutral point voltage (voltage sum 3 five equilibriums of each phase terminal) just increases by 20%.Because phase voltage is to deduct the value of neutral point voltage from terminal voltage, thus offset 20%, constant with the phase voltage before adding.It also is the same subtracting.
Thereby, in 3 modulate mutually, even utilize each mutually identical numerical value to add, subtract, the also indeclinable characteristics of phase voltage, Figure 16 is in Figure 13, the energising when phase place 30 is spent, U adds left mutually, W adds to the right mutually.Then, will equal this part that adds and append energising to the V phase.Thus, the electric current that just can measure the U phase is with W electric current mutually.
In addition, in 3 modulate mutually, even utilize each mutually identical numerical value to add, subtract, the also indeclinable characteristics of phase voltage, the energising when phase place 90 is spent, V subtracts left mutually, W subtracts to the right mutually.Then, will equal this part that subtracts deducts from the energising right side of U phase.Thus, the electric current that just can measure the V phase is with W electric current mutually.
Moreover in above-mentioned, phase place is specific, and still clearly not specific also is the same.Thereby, according to this execution mode, can further improve 3 position probing of modulating mutually.
(execution mode 4)
Figure 17 is illustrated in the structure of on the relevant motor compressor of present embodiment 4 combination of inverter being installed.In the figure, the left side of motor compressor 40 is adjacent to installation with inverter 20, and compression mechanical part 28, motor 31 etc. are set in the inside of metallic housing 32.Moreover, in the following description, above-mentioned combination is also referred to as " inverter electric compressor integral ".
Cold medium sucks from suction inlet 33, and compression mechanical part 28 (this example is a turbine) is driven by motor 31, compresses.
This cold medium in compression back, cooling motor 31 during by motor 31, discharge from outlet 34.In the inner terminal 39 that is connected with motor 31 coils, connect inverter 20.
Be installed in the motor compressor 40 as inverter 20, use box body 30.As the inverter circuit portion 37 of thermal source, between metallic housing 32 heat radiations of box body 30 to motor compressor 40.That is, inverter circuit portion 37 is between the cold medium cooling of metallic housing 32 by motor compressor 40 inside.
Such inverter electric compressor integral needs that inverter is 20 little, vibration resistance is strong, suitable embodiments of the present invention.
In Figure 18, expression is arranged on inverter 20 on the right side of motor compressor 40.Inverter circuit portion 37 is by suction pipe 38 coolings.In order to make cooling not produce dewfall, inverter 20 is configured in the below of suction pipe 38, even if make the environment temperature of inverter 20 descend, the temperature difference is also very little.
Figure 19 represents inverter 20 is arranged on structure between motor compressor 40 and the suction pipe 38.In this case, inverter circuit portion 37 is cooled off by suction pipe 38.
In Figure 18 and above-mentioned 2 examples shown in Figure 19, have the following advantages.
Just, owing to suction pipe 38 does not heat compressor 40, so can not reduce the efficient of compressor 40.In addition, the dewfall of inverter 20 is few.Because from the cold air of suction pipe 38, so the convection current that descends in box body 30 is can be effectively with cooling in the box body 30.In addition, because cold air descends, also be cooled (with reference to Fig. 1) such as the current sensor 6 beyond the inverter circuit portion 37, control parts 7 is so can guarantee the reliability of inverter 20.
In addition, no matter pipe arrangement adopts flat which kind of form that waits.As long as between inverter circuit portion 37 or inverter 20 and compressor 40, heat-barrier material is set, insulated space is just passable.
In addition, above-mentioned motor 31 in order to carry out the control of above-mentioned execution mode 1～3, preferably adopts suitable no transducer dc brushless motor.Just, possess: thus will carry out the inverter circuit that the no transducer dc brushless motor with three phase connection stator coils and p-m rotor is exported to sinuous alternating current in switch control from the direct voltage of DC power supply by 3 phase modulation systems; An and current detecting mechanism that measures the electric current that flows at each stator coil of above-mentioned no transducer dc brushless motor, according to the current value that detects by above-mentioned current detecting mechanism, judge the position of permanent magnet rotor, and the inverter of the switch of the above-mentioned inverter circuit of conduct control, in carrier cycle, conversion is to the energising timing of each phase of the stator coil of above-mentioned no transducer dc brushless motor, by the electric current in the said stator coil of measuring by above-mentioned current detecting mechanism, judge the position of above-mentioned permanent magnet rotor.
In addition, in the above-described embodiment, DC power supply is a battery, but is not limited thereto, and also goes for adopting the business exchange power supply being carried out DC power supply and the inverter that drives industrial motor that rectification forms and driving household appliances with the inverter of motor (room air conditioner use etc.).
Claims (15)
1. an inverter is characterized in that, has:
Inverter circuit (37), it exports to sinuous alternating current the no transducer dc brushless motor with three stator coils that are connected and magnet rotor by carrying out switch control with three-phase modulations from the direct voltage that DC power supply obtains;
Current detecting mechanism (6), it detects the electric current between above-mentioned DC power supply and the above-mentioned inverter circuit,
In carrier cycle, to adding during all energisings of said stator coil three-phase or deduct same conduction time,
By above-mentioned current detecting mechanism, detect the electric current that flows to the said stator coil, judge the position of above-mentioned magnet rotor, control the switch of above-mentioned inverter circuit.
2, inverter as claimed in claim 1 is characterized in that,
Above-mentioned adding or deduct is supplied with to the electric power of above-mentioned no transducer dc brushless motor according to above-mentioned DC power supply, is divided into the first half of carrier cycle and the mode of latter half and carries out.
3, inverter as claimed in claim 2 is characterized in that,
Above-mentioned adding, the first half in a phase carrier cycle, another mutually in latter half, residue mutually in central authorities in carrier cycle carry out.
4. inverter as claimed in claim 2 is characterized in that, above-mentionedly deducts computing, the first half in a phase carrier cycle, another mutually in latter half, residue mutually in latter half in carrier cycle carry out.
5, as each the described inverter in the claim 1～4, it is characterized in that,
Above-mentioned current detecting mechanism is a shunt resistance.
6. as each the described inverter in the claim 1～4, it is characterized in that,
Driving becomes the no transducer dc brushless motor (31) of the power source of compressor (40).
7. inverter as claimed in claim 6 is characterized in that,
Above-mentioned inverter constitutes one with above-mentioned no transducer dc brushless motor (31) and above-mentioned compressor (40).
8. inverter as claimed in claim 7 is characterized in that,
Suction pipe cooling by compressor.
9. inverter as claimed in claim 8 is characterized in that, is configured in the below of above-mentioned suction pipe.
10. inverter as claimed in claim 8 is characterized in that, is configured between above-mentioned suction pipe and the above-mentioned compressor.
11. inverter as claimed in claim 9 is characterized in that, is configured between above-mentioned suction pipe and the above-mentioned compressor.
12. each the described inverter as in the claim 1～4 is characterized in that above-mentioned inverter is equipped on vehicle.
13. inverter as claimed in claim 5 is characterized in that, above-mentioned inverter is equipped on vehicle.
14. inverter as claimed in claim 6 is characterized in that, above-mentioned inverter is equipped on vehicle.
15. each the described inverter as in the claim 7～9 is characterized in that above-mentioned inverter is equipped on vehicle.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP356409/2002 | 2002-12-09 | ||
| JP2002356409 | 2002-12-09 | ||
| JP361709/2003 | 2003-10-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1723603A CN1723603A (en) | 2006-01-18 |
| CN100361384C true CN100361384C (en) | 2008-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003801053650A Expired - Lifetime CN100361384C (en) | 2002-12-09 | 2003-12-09 | Inverter device integrated electric compressor |
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| Country | Link |
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| CN (1) | CN100361384C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102714440A (en) * | 2010-01-14 | 2012-10-03 | 日立工机株式会社 | Electric operating machine |
| US8988019B2 (en) | 2010-01-14 | 2015-03-24 | Hitachi Koki Co., Ltd. | Electric operating machine |
| US9359937B2 (en) | 2010-03-31 | 2016-06-07 | Hitachi Koki Co., Ltd. | Two-cycle engine and engine tool comprising the same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5446324B2 (en) * | 2008-03-12 | 2014-03-19 | 三洋電機株式会社 | Inverter device |
| CN103883498A (en) * | 2014-04-16 | 2014-06-25 | 黄智航 | Frequency conversion refrigeration compressor |
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| JPH05157287A (en) * | 1991-12-06 | 1993-06-22 | Mitsubishi Electric Corp | Electric instrument box |
| CN1115518A (en) * | 1994-01-28 | 1996-01-24 | 三菱电机株式会社 | Inverter control method and apparatus |
| JP2002291284A (en) * | 2001-03-26 | 2002-10-04 | Toshiba Kyaria Kk | Method for detecting current of motor and its controller |
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2003
- 2003-12-09 CN CNB2003801053650A patent/CN100361384C/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05157287A (en) * | 1991-12-06 | 1993-06-22 | Mitsubishi Electric Corp | Electric instrument box |
| CN1115518A (en) * | 1994-01-28 | 1996-01-24 | 三菱电机株式会社 | Inverter control method and apparatus |
| CN1163510A (en) * | 1994-01-28 | 1997-10-29 | 三菱电机株式会社 | Method and apparatus for controlling invertor |
| CN1164144A (en) * | 1994-01-28 | 1997-11-05 | 三菱电机株式会社 | Method and equipment for controlling converter |
| JP2002291284A (en) * | 2001-03-26 | 2002-10-04 | Toshiba Kyaria Kk | Method for detecting current of motor and its controller |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102714440A (en) * | 2010-01-14 | 2012-10-03 | 日立工机株式会社 | Electric operating machine |
| US8917037B2 (en) | 2010-01-14 | 2014-12-23 | Hitachi Koki Co., Ltd. | Electric operating machine |
| US8988019B2 (en) | 2010-01-14 | 2015-03-24 | Hitachi Koki Co., Ltd. | Electric operating machine |
| CN102714440B (en) * | 2010-01-14 | 2015-09-30 | 日立工机株式会社 | Electric operating machine |
| US9359937B2 (en) | 2010-03-31 | 2016-06-07 | Hitachi Koki Co., Ltd. | Two-cycle engine and engine tool comprising the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1723603A (en) | 2006-01-18 |
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