CN1762089A - Electrically powered compressor - Google Patents
Electrically powered compressor Download PDFInfo
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- CN1762089A CN1762089A CNA2004800002232A CN200480000223A CN1762089A CN 1762089 A CN1762089 A CN 1762089A CN A2004800002232 A CNA2004800002232 A CN A2004800002232A CN 200480000223 A CN200480000223 A CN 200480000223A CN 1762089 A CN1762089 A CN 1762089A
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- motor compressor
- compressor
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- 239000003507 refrigerant Substances 0.000 claims abstract description 7
- 238000004804 winding Methods 0.000 claims description 49
- 238000001514 detection method Methods 0.000 claims description 27
- 230000007246 mechanism Effects 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000012141 concentrate Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 150000002910 rare earth metals Chemical class 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000010349 pulsation Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
A compressor includes a motor driven by a controller and having a rotor and a stator, a compressing unit driven by the motor in a hermetic container in which refrigerant is filled. Driving the motor at a low rpm, the controller practices a feedback control which determines a timing of turning on/off switching elements based on a signal detecting a position of the rotor, and when the motor is driven at a high rpm, the controller practices an open-loop control which outputs a given frequency and drives the motor synchronizing with the given frequency. This structure achieves a compressor working with a fewer noises in PWM driving.
Description
Technical field
The motor compressor that the inversion that the present invention relates to mainly to use in family expenses refrigerator or air conditioner drives.
Background technology
Brushless DC motor is high efficiency, and is many in recent years as in the compressor that uses in refrigeration system etc.
As existing motor compressor, the position of the back electromotive force detection rotor that produces by the stator winding of motor, when coming drive motors based on its position detection signal, switch element is opened circuit, the method (for example, the flat 3-55478 communique of Japanese Patent Application Laid-Open) of carrying out PWM (pulse-width modulation) control is known.
The control device of existing motor compressor is described with reference to the accompanying drawings.
Fig. 8 is the vertical view of stator of the motor of existing motor compressor, and Fig. 9 is the vertical view of rotor of the motor of existing motor compressor, and Figure 10 is the line map of the control device of existing motor compressor.
In Fig. 8, the stator 1 of motor is included in a plurality of T shape parts 5 that form on the core body 3.The concentrated area winding 7 of reeling respectively on each T shape part 5.
On the other hand, in Fig. 9, the rotor 10 of motor is to imbed 4 permanent magnets 14 and form and imbed magnet type (IPM type) rotor in unshakable in one's determination 12.
In Figure 10, motor 30 moves compressing mechanism 32 by constituting at the stator shown in Fig. 81 with at the rotor shown in Fig. 9 10 by the axle (not shown).Be used for the alternating current of source power supply 34 is carried out the rectification circuit 36 of rectification, adopt the voltage multiplying rectifier mode, input AC100V, output DC250V.
Counter electromotive force detection circuit 42, by the back electromotive force that in each stator winding of the three-phase of motor 30, produces, the relative position that comes detection rotor to rotate.Drive circuit 46 makes the switch element of inverter 40 carry out ON/OFF.Commutating circuit 48, based on the output signal of counter electromotive force detection circuit 42, decision is opened which switch element of inverter 40 when motor 30 runs well.Pwm control circuit 50, make inverter 40 last side arm switch element or down in the switch element of side arm which open circuit, carry out PWM (pulse-width modulation) control.
So-called PWM control is the duty factor raising/reduction with pulsewidth, makes the control mode of the average voltage rising/decline of output.At this, in this manual, so-called " duty factor " is defined as the ratio during " opening " in the pulse period.
The following describes the action of the control device of the existing motor compressor that constitutes as described above.
Owing to, in stator winding, do not produce back electromotive force, so the position of impossible detection rotor making motor 30 when halted state starts.Therefore, output low frequency and be the voltage of low fill factor forcibly from inverter 40.By this output voltage is applied on the stator winding, make motor begin rotation (being commonly referred to as low frequency starts synchronously) forcibly.
So just begun rotation,, in the stator winding of each phase, produced back electromotive force when this rotation has when to a certain degree rising, from counter electromotive force detection circuit 42 with regard to the output rotor position detection signal.48 pairs of these position detection signals of commutating circuit are handled, to drive circuit 46 output commutation signal.Based on this commutation signal, 6 switch elements that drive circuit 46 makes inverter 40 are ON/OFF successively, thus successively to each phase supply capability of stator winding.Like this, carry out the normal operation (carrying out FEEDBACK CONTROL) of direct current machine by position detection signal.
In direct current machine, can control rotating speed by the voltage that change is applied on this motor.Therefore, based on signal from pwm control circuit 50, the duty factor when strengthening pulse-width modulation, thus the mean value that makes motor apply voltage improves, and rotating speed of motor is risen.Otherwise by reducing duty factor, the mean value that makes motor apply voltage reduces, and rotating speed is descended.
Because the output of the position detection signal of counter electromotive force detection circuit 42, with the rotation of rotor be synchronous, so acquisition of signal rotating speed thus.This tach signal that detects is compared with speed reference signal, this comparative result is fed back regulate duty factor, thereby can carry out rotating speed of motor control.
At this, duty factor=(open during/(open during+close during)) * 100.For example, when being 50% during opening 50%, during closing, duty factor just is expressed as 50%.
But, in such existing structure, be to control rotating speed by pulse duty factor from pwm control circuit 50.The frequency that opens circuit in pulse-width modulation (below be called carrier frequency), generally be by number kHz to tens kHz, be accompanied by such carrier frequency and will produce noise.
Because built-in permanent magnet 14 in IPM type rotor 10, so form the magnetic circuit that the T shape part 5 of the iron core 12 of rotor 10 and stator 1 links.Therefore, be under the situation of square wave at the electric current that is supplied to stator winding 7, when energising was switched mutually, magnetic circuit also switched in adjacent T shape part 5, causes the rapid variation of magnetic force.Consequently, owing to causing that on stator 1 noise takes place in distortion.
Because by the duty factor control rotating speed of pulse, have maximum output so become at 100% o'clock in duty factor, can not be with the rotation speed operation higher than this moment.Therefore, in order to obtain the ability of required motor compressor, need to improve the output of motor 30, under the situation of copper as stator winding of using same amount, how much output improves, and how many electric efficiencies just descends.
In order to solve aforesaid problem, in the stator winding 7 of motor 30, do not import square wave, but apply the three phase sine alternating current wave, will reduce noise.
But, apply the method for three phase sine alternating current wave, owing to be difficult to obtain rotor position detection information from counter electromotive force detection circuit, so must calculate the position of rotor by the information of the current detection circuit that is used to detect the electric current that flows through stator winding.In the case, the common practice is, for this current detecting, need make Current Transformer, in addition, for the calculating of rotor-position, needs to use the microcomputer that can carry out high-speed computation.Consequently, apply the method for three phase sine alternating current wave, price is very expensive.
Summary of the invention
Motor compressor of the present invention has following structure.
Motor compressor of the present invention comprises: the closed container of having enclosed refrigerant; The motor of receiving and keeping in closed container, having the rotor that contains permanent magnet and stator and drive by control device; Receive and keep in closed container, by the compressors driven structure.It is characterized in that: this control device, when slow-speed of revolution drive motors, implementation makes the FEEDBACK CONTROL of the open/close timing of switch element by the decision of the position detection signal of rotor, when high rotating speed drive motors, carry out the output assigned frequency, with the synchronously open loop control of drive motors of this assigned frequency.
According to such structure,, can use the high efficiency motor of setting maximum output lower owing to can under high rotating speed, move.Relatively increase duty factor, can reduce the noise of the carrier frequency of PWM control.So, the present invention just can provide a kind of cheapness, low noise and high efficiency motor compressor.
Description of drawings
Fig. 1 is the profile of the motor compressor of embodiment of the present invention.
Fig. 2 is the vertical view of the motor stator of motor compressor shown in Figure 1.
Fig. 3 is the vertical view of the rotor of motor compressor shown in Figure 1.
Fig. 4 is the circuit diagram of control device of the motor compressor of embodiment of the present invention.
Fig. 5 is the block diagram of control device shown in Figure 4.
Fig. 6 is the performance plot of the torque of the motor in the motor compressor of embodiment of the present invention to rotating speed.
Fig. 7 is the performance plot of control device of the motor compressor of embodiment of the present invention.
Fig. 8 is the vertical view of the motor stator of existing motor compressor.
Fig. 9 is the vertical view of the rotor of existing motor compressor.
Figure 10 is the circuit diagram of the control device of existing motor compressor.
Embodiment
Below, with reference to the execution mode of description of drawings motor compressor of the present invention.
Fig. 1 is the profile of the motor compressor of embodiment of the present invention, Fig. 2 is the vertical view of the motor stator of motor compressor shown in Figure 1, Fig. 3 is the vertical view of the rotor of motor compressor shown in Figure 1, Fig. 4 is the circuit diagram of control device of the motor compressor of embodiment of the present invention, Fig. 5 is the block diagram of control device shown in Figure 4, Fig. 6 is the performance plot of the torque of the motor in the motor compressor of embodiment of the present invention to rotating speed, and Fig. 7 is the open/close timing of the switch element in the control device of motor compressor of embodiment of the present invention and the performance plot of current waveform.
In Fig. 1, in closed container 101, when storing oil 103, also enclosed refrigerant 102.As the kind of refrigerant 102, be fit to adopt R600a.In closed container 101, received and kept the motor 115 that possesses stator 110 and rotor 112.In closed container 101, flexibly supporting by motor 115 compressor driven structures 120.
As shown in Figure 2, the stator 110 of motor is included in 9 T shape parts 142 that core body 140 forms above.The concentrated area winding 145 of reeling respectively on each T shape part 142 constitutes the so-called convoluted stator of concentrating.
At this, motor is to have the three phase electric machine that carries out U phase winding, V phase winding and the W phase winding of line so as described below.
Winding 171 concentrated areas are wound on the T shape part 181.Winding 174 concentrated areas are wound on the T shape part 184.Winding 177 concentrated areas are wound on the T shape part 187.These windings 171,174 and 177 constitute the U phase winding that is connected in series.
Winding 172 concentrated areas are wound on the T shape part 182.Winding 175 concentrated areas are wound on the T shape part 185.Winding 178 concentrated areas are wound on the T shape part 188.These windings 172,175 and 178 constitute the V phase winding that is connected in series.
Winding 173 concentrated areas are wound on the T shape part 183.Winding 176 concentrated areas are wound on the T shape part 186.Winding 179 concentrated areas are wound on the T shape part 189.These windings 173,176 and 179 constitute the W phase winding that is connected in series.
At this, in the explanation of embodiment of the present invention, with winding 145 as the representative of above-mentioned winding 171～179 and describe with the representative of T shape part 142 as above-mentioned T shape part 181～189.
On the other hand, in Fig. 3, the rotor 112 of motor has been buried 6 tabular permanent magnets 152 underground in unshakable in one's determination 150, constitutes what is called and imbeds magnet type (interior permanent-magnet type (IPM type)) rotor.Permanent magnet 152 is formed by for example neodymium-iron-boron based rare earth magnet.
Motor is to have disposed rotor 112 as shown in Figure 3 in the inboard of as shown in Figure 2 stator 110 and constitute.The inner face of each T shape part 142 of stator 110 and the outside of rotor 112, across a space relatively to.
With regard to the motor that constitutes as described above, the permanent magnet of burying underground in rotating magnetic field that is produced by the electric current in the winding 145 of reeling on each T shape part 142 of stator 110 of flowing through and the iron core 150 at rotor 112 152 is related and the torque of magnetic force that produces and the synthetic torque of reluctance torque make rotor 112 rotations.That is to say that this motor because the effect of the permanent magnet of burying underground 152 not only can effectively utilize torque of magnetic force, but also can effectively utilize reluctance torque, is compared with the motor that only utilizes torque of magnetic force, has improved efficient in the iron core 150 of rotor 112.
The following describes the control device of the motor compressor in the present embodiment.
In Fig. 4, source power supply 161 is AC power of 100V60Hz for example.
Structure has been described above, has the following describes its action.
By control device 160 drive motors 115, make bent axle 126 rotations by the rotor 112 of this motor.The eccentric motion of the eccentric axial portion 124 that is connected with this bent axle by bindiny mechanism 138, converts the reciprocating motion that piston 135 carries out in discharge chambe 130, carry out compressed action thus.
Use Fig. 5 below, the action of control device 160 is described.
In Fig. 5, control device 160 is acknowledge(ment) signal from position detecting circuit 165, confirms rotating speed of motor in step 1.Then, in step 2, when its rotating speed (when the slow-speed of revolution drives) when setting is following, control device 160 position detection signal according to rotor in step 3 carries out FEEDBACK CONTROL.On the other hand, when the rotating speed in step 2 when driving (high rotating speed) not when setting is following, control device 160 in step 4, export assigned frequency, with the synchronously open loop control of drive motors of this output frequency.
At this, control device 160 export assigned frequency, with the synchronously open loop control of drive motors of this output frequency, thus, compare with the situation of the FEEDBACK CONTROL of carrying out according to position detection signal, can realize higher rotating speed.
For this action, also utilize Fig. 6 to explain.In Fig. 6, the motor characteristic when maximum duty factor (for example 100%) when C represents to carry out FEEDBACK CONTROL according to common position detection signal.Become common torque and improve the such characteristic of rotating speed reduction.
Now, when the instruction rotating speed of motor is r1, when torque was t1, motor turned round at the A point.At this moment, control circuit 166 carries out the FEEDBACK CONTROL of position-based detection signal, owing to be to turn round by optimum transition state, thereby carry out high efficiency running.
At this, when the instruction rotating speed became r2, control circuit 166 was a target with the B point, strengthens duty factor in order to improve rotating speed.Rotating speed is improved, but when advancing to the D point that intersects with characteristic C, reach maximum duty factor (for example 100%), can not bring up to the rotating speed more than this again.
At this moment, control circuit 166 duty factor is fixed on maximum duty factor (for example 100%) locate constant in, switch to the open loop control that improves output frequency.That is to say, only improve and the irrelevant output frequency of position detection signal, become the running control of the synchronous machine that drives with this Frequency Synchronization ground.
At this moment, the phase place of current of electric is compared with the phase place of the back electromotive force that produces in stator winding, is in leading state, by such running, just makes a part of current of electric weaken magnetic flux.Consequently, make the back electromotive force that in stator winding, produces reduce,, make tachometer value improve, thereby can turn round with high rotating speed because this back electromotive force is improved the service voltage from power supply.Usually this effect is called feeble field magnetic control system.
Use Fig. 7 that the wide-angle energising of drive waveforms is described below.
In Fig. 7, transverse axis express time, the longitudinal axis represent that U goes up mutually, V goes up mutually, W goes up mutually, U mutually down, V mutually down, the open/close state of each switch element of W under mutually, demonstrate the waveform of U phase current simultaneously.V phase current and W phase current, with respect to the U phase current, having electrical degree is the phase difference of 120 degree, their current waveform is similar to the U phase current waveform, is omitted on Fig. 7.
As shown in Figure 7, become the wide-angles energising that electrical degree is 150 degree by the angle of will switching on, the U phase current waveform is that the square wave electric currents of 120 degree energisings are compared with common electrical degree, and the electric current of rising reduces, and is similar to sinusoidal waveform.
Consequently, when the slow-speed of revolution drove, when carrying out the FEEDBACK CONTROL of position-based detection signal, because the wide-angle energising, electric current reduced the torque pulsation of motor near sinusoidal wave shape.Consequently, under the situation of present embodiment, compare, can reduce vibration significantly with existing 120 degree energisings.
And when high rotating speed drives, carry out the open loop control that drives with assigned frequency, in duty factor 100% and carry out under the situation of wide-angle energising, electric current approaches sinusoidal wave shape, and the torque pulsation of motor is reduced.Consequently, rotation becomes steadily, and can run up.
In the superincumbent explanation, the energising angle adopts the electrical degree of 150 degree, even but electrical degree is more than 130 degree, when less than 180 is spent, also can expect has the same effect of being close to, and can not depart from theme of the present invention.
Advantage by aforesaid embodiment of the present invention, motor compressor in the present embodiment need have under the situation of the refrigerating capacity identical with existing motor compressor, can reduce volume of cylinder, piston shown in Figure 1 135 can be reduced, the offset of eccentric axial portion 124 can be reduced with respect to main shaft part 123.Therefore, the motor compressor in the present embodiment can reduce the vibration of compressing mechanism 120.Particularly, as the kind of refrigerant, using refrigerating capacity very little and require to obtain the significant effect of improving under the situation of R600a of very big volume of cylinder.
By the advantage of embodiment of the present invention,, can use the motor of setting maximum output lower for motor.Consequently, owing to can adopt the high efficiency motor of the winding of reeling more, can access high efficiency motor compressor.
Owing to can relatively increase the duty factor under the same rotational speed, relatively reduced the noise of the carrier frequency of PWM control.
Stator is to form to concentrate the mode of reeling to implement winding on each T shape part of iron core, the mode of reeling is compared with distributing, though the vibration-damping effect between winding and T shape part is little, be easy to generate sound because of vibration increases, but can reduce the noise of carrier frequency or torque pulsation.Therefore, motor compressor of the present invention can use cheap and high efficiency concentrated winding motor can be realized low noise.
And, the motor of motor compressor of the present invention has been imbedded tabular permanent magnet 152 in the iron core 150 of rotor 112, utilized simultaneously torque of magnetic force and reluctance torque the two, improved efficiency of motor, constituted motor with so-called IPM type (interior permanent-magnet type) rotor.And, obtaining high efficient in order to improve magnetic flux density, permanent magnet 152 is made of neodymium-iron-boron based rare earth magnet.
IMP type rotor, built-in magnet have formed the strong magnetic circuit of the T shape part that connects rotor core and stator.In the present embodiment, because permanent magnet 152 forms by rare earth magnet, so formed stronger magnetic circuit.Consequently, be under the situation of square wave at each phase current, when commutation, magnetic circuit switches in adjacent T shape part, therefore, causes the rapid variation of magnetic force, makes stator deformability thus, produces the noise as cause.
But in the present embodiment, because phase current is similar to sinusoidal waveform, before and after commutation, current value reduces, and after commutation, electron stream increases and decreases smoothly, so magnetic force is little with respect to the variation of stator.Consequently, just suppress the distortion of stator, vibration suppression can have been got very for a short time, can realize the motor compressor of high efficiency, low noise.
According to aforesaid execution mode, can realize cheapness, low noise and high efficiency motor compressor.
In the present embodiment, the motor compressor that the reciprocating compressor structure of in closed container elasticity twelve Earthly Branches support has been described and has constituted, but the type of fixing the motor compressor of direct stator or compressor in closed container also has same effect when for example being rotary-type or Scrawl.
In the present embodiment, permanent magnet is formed by rare earth magnet, but promptly uses formation such as ferrimagnet, also can obtain same effect and effect.
In the present embodiment, rectification circuit 162 is voltage doubling rectifing circuits, but also can be other rectifier system (for example full-wave rectifying circuit or half-wave rectifying circuit), much less, also can be that the rectifier system that can switch of output voltage (for example to voltage multiplying rectifier and full-wave rectification is changed or the rectifier system switched with semiconductor switch etc.) or output voltage can be transformed to linear rectifier system (boost and open circuit or high pressure DC-DC converter such as open circuit).Position detecting circuit 165 takes to detect at the input terminal of motor 115 mode of the back electromotive force that produces, but also can use the position-detection sensor of hole element etc.
As mentioned above, the control device in motor compressor of the present invention when the slow-speed of revolution drives, is carried out the position-based detection signal and is carried out the FEEDBACK CONTROL that PWM drives, and when high rotating speed drives, carries out the open loop control of output assigned frequency.And, when high rotating speed drives, irrespectively improve output frequency with position detection signal, improve rotating speed synchronously with it, carry out action as synchronous machine, the phase place of current of electric is compared in advance with the phase place of the back electromotive force of motor and is turned round, so feeble field magnetic control system works, and can turn round with high rotating speed.Consequently, can use the high efficiency motor of setting maximum output lower, also can improve the duty factor under the same rotating speed simultaneously, therefore can reduce the noise of the carrier frequency of PWM control.
Utilizability on the industry
Motor compressor of the present invention owing to can carry out high-revolving running, can use with Compare at present the high efficiency motor of setting maximum output lower, and by with present phase Can reduce the noise of the carrier frequency of PWM control than relatively increasing duty factor. By This can provide a kind of cheapness, low noise, high efficiency motor compressor, so especially suitable Close in the purposes such as domestic refrigerator or air-conditioner.
Claims (6)
1. a motor compressor comprises: the closed container of having enclosed refrigerant; The motor of receiving and keeping in described closed container, having the rotor that contains permanent magnet and stator and drive by control device; Receive and keep in described closed container, by described compressors driven structure, it is characterized in that:
Described control device, when the slow-speed of revolution drives described motor, implementation is made the FEEDBACK CONTROL of the open/close timing of switch element by the position detection signal decision of described rotor, when high rotating speed drives described motor, carry out the output assigned frequency, synchronously drive the open loop control of described motor with described assigned frequency.
2. motor compressor as claimed in claim 1 is characterized in that:
Motor is a three phase electric machine, and control device is that 130 degree are above, the energising of less than 180 degree to the electrical degree of respectively carrying out respectively mutually in the three-phase of described motor.
3. motor compressor as claimed in claim 1 or 2 is characterized in that: stator is to concentrate the mode of reeling to implement winding on each T shape part of this stator.
4. motor compressor as claimed in claim 1 or 2 is characterized in that: permanent magnet embedment is in the iron core that forms rotor.
5. motor compressor as claimed in claim 1 or 2 is characterized in that:
Compressing mechanism comprises: the cylinder that forms discharge chambe; Being inserted in the described discharge chambe can free pistons reciprocating; Bent axle with main shaft part and eccentric axial portion; With, connect the bindiny mechanism of described piston and described eccentric axial portion.
6. motor compressor as claimed in claim 1 or 2 is characterized in that: the kind of refrigerant is R600a.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003071421A JP4341266B2 (en) | 2003-03-17 | 2003-03-17 | Method and apparatus for driving brushless DC motor |
| JP071421/2003 | 2003-03-17 | ||
| JP2003327817A JP2005094971A (en) | 2003-09-19 | 2003-09-19 | Method and apparatus for driving brushless dc motor |
| JP327817/2003 | 2003-09-19 | ||
| JP417810/2003 | 2003-12-16 | ||
| JP2003417810A JP4300991B2 (en) | 2003-12-16 | 2003-12-16 | Brushless DC motor drive device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1762089A true CN1762089A (en) | 2006-04-19 |
| CN100426650C CN100426650C (en) | 2008-10-15 |
Family
ID=33287863
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800050310A Expired - Lifetime CN100428619C (en) | 2003-03-17 | 2004-03-08 | Driving method and driver of DC brushless motor |
| CNB2004800002232A Expired - Fee Related CN100426650C (en) | 2003-03-17 | 2004-03-16 | Electrically powered compressor |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800050310A Expired - Lifetime CN100428619C (en) | 2003-03-17 | 2004-03-08 | Driving method and driver of DC brushless motor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4341266B2 (en) |
| CN (2) | CN100428619C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07112356B2 (en) * | 1986-05-06 | 1995-11-29 | 三菱電機株式会社 | Electric motor controller |
| JP3672637B2 (en) * | 1995-09-29 | 2005-07-20 | 松下冷機株式会社 | Compressor motor control device |
| JP3538541B2 (en) * | 1998-05-27 | 2004-06-14 | 松下電器産業株式会社 | DC motor speed controller |
| US6121736A (en) * | 1998-07-10 | 2000-09-19 | Matsushita Electric Industrial Co., Ltd. | Control apparatus for motor, and motor unit having the control apparatus |
| JP2001037281A (en) * | 1999-05-18 | 2001-02-09 | Matsushita Electric Ind Co Ltd | Motor torque controller |
| JP3679673B2 (en) * | 2000-01-31 | 2005-08-03 | 三洋電機株式会社 | Permanent magnet motor rotor |
| CN2520484Y (en) * | 2002-01-09 | 2002-11-13 | 河北节能投资有限责任公司 | Thermoelectric cooling radiator |
-
2003
- 2003-03-17 JP JP2003071421A patent/JP4341266B2/en not_active Expired - Lifetime
-
2004
- 2004-03-08 CN CNB2004800050310A patent/CN100428619C/en not_active Expired - Lifetime
- 2004-03-16 CN CNB2004800002232A patent/CN100426650C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103347658A (en) * | 2011-02-10 | 2013-10-09 | 株式会社牧田 | Electric tool |
| US9154062B2 (en) | 2011-02-10 | 2015-10-06 | Makita Corporation | Electric power tool |
| CN110385667A (en) * | 2018-04-16 | 2019-10-29 | 株式会社牧田 | Electric tool |
| CN110385667B (en) * | 2018-04-16 | 2022-04-29 | 株式会社牧田 | Electric tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004282911A (en) | 2004-10-07 |
| CN100426650C (en) | 2008-10-15 |
| CN1754303A (en) | 2006-03-29 |
| JP4341266B2 (en) | 2009-10-07 |
| CN100428619C (en) | 2008-10-22 |
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