CN1201476C - Driving gear and driving method of a.c motor - Google Patents
Driving gear and driving method of a.c motor Download PDFInfo
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- CN1201476C CN1201476C CN 02102797 CN02102797A CN1201476C CN 1201476 C CN1201476 C CN 1201476C CN 02102797 CN02102797 CN 02102797 CN 02102797 A CN02102797 A CN 02102797A CN 1201476 C CN1201476 C CN 1201476C
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Abstract
The invention is to solve the conventional problem of a smoothing capacitor of small capacity being incapable of performing backup for an instantaneous power failure, in an apparatus for driving an induction motor with a circuit composed of a rectifying circuit, the smoothing capacitor and an inverter. The induction motor 1 is driven by the rectifying circuit 5, the smoothing capacitor 6, and the variable-frequency variable-voltage inverter 7. The inverter 7 is constituted so as to be regeneratable. By reducing the output frequency and the output voltage of the inverter 7 at an instantaneous power failure, a regenerative operation is conducted, and the voltage of the smoothing capacitor 6 is controlled so as to be kept at a lower level than its normal one.
Description
Technical field
The present invention relates to device and method, be specifically related to the drive unit and the driving method that combine by ac-dc conversion circuit and DC-AC translation circuit in order to alternating current motors such as driven induction motors.
Background technology
The ac-dc conversion circuit that is made of rectifier or converter is connected the drive unit that capacitor is the induction motor that combines of DC-AC translation circuit that smmothing capacitor and inverter constitute with direct current, be widely used so far always.
, the problem that instantaneous power-off and voltage descend appears in regular meeting during AC power.Strengthening the capacity of smmothing capacitor, is to deal with instantaneous power-off, but this can make equipment huge and strengthen cost thus.As the method that continues inverter control when the instantaneous power-off, the method of Kao Lving is in the industry: the output frequency that makes inverter is that the speed of gyration of inertia rotary state is also low than the idling conditions of induction motor, allow induction motor serve as generator usefulness, and supply with regenerative electric energy to smmothing capacitor by the DC-AC translation circuit.But, promptly use the regenerative electric energy of induction motor to charge to smmothing capacitor, also can be because of that the voltage of smmothing capacitor is occurred is unstable with the inconsistent situation of the inconsistent grade of the inertia of induction motor and environmental condition, thus the control of inverter can not stably be continued.And behind the power recovery, the output that inverter also may occur forms overcurrent and superpotential state.
Summary of the invention
The object of the present invention is to provide, when instantaneous power-off and supply voltage descend, can make the control action of DC-AC translation circuit stablize the driving method and the device of the induction motor of continuation.
(in order to solve the means of problem)
To the present invention, explain in company with the Reference numeral of Fig. 1-Fig. 4 in order to solve above-mentioned problem, to reach above-mentioned purpose.But Reference numeral herein is in order to help understanding of the present invention, and be not limit of the present invention.
The present invention relates to a kind of drive unit of alternating current motor, this drive unit comprises: the AC input terminal 4a that is connected with AC power, 4b, 4c, be connected in the ac-dc conversion circuit 5 of above-mentioned ac terminal, be connected in the smmothing capacitor 6 between a pair of direct current lead-out terminal of above-mentioned ac-dc conversion circuit 5, be connected between above-mentioned smmothing capacitor 6 and the alternating current motor 1, and constitute renewable action, and comprise that the DC-AC conversion is with the DC-AC translation circuit 7 of switch, with the control circuit that the output frequency and the output voltage of described DC-AC translation circuit 7 are controlled; It is characterized in that:
Described control circuit comprises:
Condenser voltage testing circuit 9 is connected with above-mentioned smmothing capacitor 6;
Whether power cut detection circuit 47 is lower than the power down mode that detects of setting in order to the voltage according to above-mentioned AC input terminal, is connected with above-mentioned AC input terminal;
Reference voltage generating circuit 41, the reference voltage V dcr of the voltage reference of the above-mentioned smmothing capacitor 6 of generation expression;
Difference signal forms device 42,43,44, produce circuit 41 with said reference and be connected, and have the function of the difference signal Δ Vf of the difference that detects the reference voltage V dcr that voltage Vdc and said reference voltage generation circuit 41 obtain that the expression of forming obtains from above-mentioned condenser voltage testing circuit 9;
Frequency is determined to produce circuit 49 with fiducial value, produces use and determines to use fiducial value Vfr with the frequency of the output frequency of definite above-mentioned DC-AC translation circuit 7;
Correction value produces circuit 50, be connected with above-mentioned power cut detection circuit 47 and have above-mentioned power cut detection circuit 47 detect power down mode during, produce in order to the output frequency of above-mentioned DC-AC translation circuit 7 and output voltage are dropped to and be lower than above-mentioned AC power output frequency just often and the function of the correction value Vf of output voltage;
First subtracter 51 determines that with said frequencies producing circuit 50 with reference generating circuit 49 and above-mentioned correction value is connected and has from the definite function that deducts above-mentioned correction value Vfc with fiducial value (Vfr) of said frequencies;
Second subtracter 45 forms circuit with above-mentioned first subtracter 51 and above-mentioned difference signal and is connected and has a function that deducts above-mentioned difference DELTA Vf from the output Vfrc of above-mentioned first subtracter 5;
Frequency instruction transmits lead 20, be used for the output of above-mentioned second subtracter (45) is transmitted as frequency command signal Vf1, and (45 is connected with above-mentioned second subtracter;
Voltage instruction value forms circuit 46, is connected with above-mentioned second subtracter 45 and has when power down mode, and formation remains in function than the voltage instruction value V1 of just often low value in order to the output voltage with above-mentioned DC-AC translation circuit 7;
Voltage instruction transmits lead 21, forms circuit 46 with above-mentioned voltage instruction value and is connected;
Sine voltage generation device 22,23 transmits lead 20 with said frequencies instruction and is connected and produces the sine voltage with frequency that said frequencies command signal Vf1 is shown;
Multiplier 24,25,26 transmits lead 21 with above-mentioned sine voltage generation device and above-mentioned voltage instruction and is connected and has a function that above-mentioned voltage instruction value V1 and above-mentioned sine voltage are multiplied each other;
Saw-tooth wave generating circuit 27, generation has the sawtooth voltage that frequency is higher than the frequency of above-mentioned sine voltage; With
Comparison means 28,29,30, be connected with switch with above-mentioned multiplier, above-mentioned saw-tooth wave generating circuit and above-mentioned DC-AC conversion and have the output of above-mentioned multiplier and above-mentioned sawtooth voltage comparison, and form in order to control the function of above-mentioned DC-AC conversion with the pwm control signal of switch.
Above-mentioned correction value produces circuit 50 also to be had when above-mentioned power down mode is eliminated, and produces the function of the correction value that improves gradually in order to output frequency and output voltage with above-mentioned DC-AC translation circuit 7.
(effect of the present invention)
According to the present invention, as because of instantaneous power-off or voltage decline AC supply voltage once being lower than certain value, the output frequency and the output voltage of DC-AC translation circuit just are controlled, keep smmothing capacitor voltage in setting to move, so the action of DC-AC translation circuit can stably continue by regeneration.
And,, therefore can easily form voltage instruction value V1 by enough simple circuit owing to using the frequency command signal Vf1 that obtains from second subtracter 45 to make voltage instruction value V1.
Description of drawings
Fig. 1 is the schematic block diagram of the induction motor drive unit of one embodiment of the invention.
Fig. 2 is the circuit diagram of rectification circuit and inverter among Fig. 1.
Fig. 3 is the detailed circuit diagram that pwm control signal forms circuit among Fig. 1.
Fig. 4 is the circuit diagram that instruction of Fig. 1 medium frequency and voltage instruction form circuit.
Fig. 5 is the oscillogram of each several part state among presentation graphs 1 and Fig. 3.
Fig. 6 is the input and output oscillogram of comparison circuit among Fig. 2.
(symbol description)
1. induction motor
5. rectification circuit
6. smmothing capacitor
7. inverter
8.PWM control signal forms circuit
10. frequency instruction and voltage instruction form circuit
Embodiment
Below, with reference to the description of drawings embodiments of the invention.
As shown in Figure 1, the drive unit 2 of the three phase induction motor 1 of the embodiment of the invention is such as being made up of following each several part: first, second and the 3rd input terminal 4a, 4b, the 4c that are connected in the sinusoidal wave three-phase alternating-current motor of 50Hz, rectification circuit 5, can be described as smmothing capacitor 6, variable-frequency variable-voltage type inverter 7 that direct current connects capacitor, pwm control signal forms circuit 8, condenser voltage testing circuit 9, and frequency instruction and voltage instruction formation circuit 10.
As the rectification circuit 5 of ac-dc conversion circuit, as shown in Figure 2, the three-phase bridge rectifier circuit of being made up of first, second first to the 6th diode 5a～5f that is connected with the 3rd input terminal 4a, 4b, 4c with three-phase constitutes.Have, rectification circuit 5 can be deformed into the known converter circuit of the switching mode that adopts semiconductor switch, i.e. switch rectifying circuit again.
The induction motor 1 that is connected in inverter 7 drives the revolution load 13 with inertia.When being in inverter 7 and stopping state to induction motor 1 power supply, the rotor of induction motor 1 rotates under action of inertia, and at this moment induction motor 1 works in the generator state, carries regenerated electric power to inverter 7 one sides.
Pwm control signal forms circuit 8, is the circuit that forms first to the 6th control signal of first to the 6th switch Q1～Q6 switching that the bridge-type that makes inverter 7 shown in Figure 2 connects.As shown in Figure 3, form comprising of this circuit: frequency instruction line 20, voltage instruction line 21, voltage-controlled oscillator (being VCO22), three phase sine wave generation circuit 23, first, second and the 3rd multiplier 24,25,26, saw-tooth wave generating circuit 27, first, second and the 3rd comparator 28,29,30, first, second and the 3rd NOT circuit 31,32,33, and idle time, (dead time) gave circuit 34.
Be connected in the VCO 22 of frequency instruction line 20, produce the clock signal of its frequency corresponding to the frequency instruction voltage Vf1 of order line 20.
Be connected in the three phase sine wave generation circuit 23 of VCO 22, produce synchronously but three-phase sine wave voltage Va, Vb, the Vc of 120 degree phase differences are arranged with the output of VCO 22.The output frequency of the corresponding VCO 22 of the frequency of three-phase sine wave voltage Va, Vb, Vc and changing.
First, second that is connected with three phase sine wave generation circuit 23 with voltage instruction line 21 and the 3rd multiplier 24,25,26, voltage instruction voltage V1 on the order line 21 is multiplied each other with first, second and the 3rd sine voltage Va, Vb, Vc, export first, second and third phase voltage instruction value Va ', Vb ', Vc '.
Saw-tooth wave generating circuit 27 is with (20～150kHz) carrier signals that produce sawtooth voltages or triangle wave voltage for example of the very high repetition rate more than the several times that are higher than three-phase sine wave voltage Va, Vb, Vc frequency.
First, second and the 3rd comparator 28,29,30, connect with first, second, third multiplier 24,25,26 and saw-tooth wave generating circuit 27, first, second and third phase voltage instruction value Va ', Vb ', Vc ' are made comparisons with sawtooth voltage Vt, produce pwm control signal Vg1, the Vg3, the Vg5 that use for the first, the 3rd and the 5th switch Q1, Q3, Q5.Fig. 6 (A) has represented to import the first phase voltage command value Va ' and the sawtooth voltage Vt of first comparator 28, and Fig. 6 (B) summary has been represented from the first control signal Vg1 of first comparator, 28 outputs.Second with identical with first comparator 28 of the action of the 3rd comparator 29,30.
First, second and the 3rd NOT circuit 31,32,33 form the second, the 4th and the 6th control signal Vg2, Vg4, the Vg6 that is made of first, second and the phasing back signal of the output of the 3rd comparator 28,29,30, for the second, the 4th and the 6th switch Q2, Q4, Q6 use.Give circuit 34 idle time, with known method between the connection period of first and second switch Q1, Q2, between the connection period of the 3rd and the 4th switch Q3, Q4, providing between stand-down between the connection period of the 5th and the 6th switch Q5, Q6 is idle time, and this has prevented that also above-mentioned switch from becoming on-state simultaneously.Obtain first to the 6th control signal Vg1～Vg6 of idle time, be sent to the control end of first to the 6th switch Q1～Q6.Like this, first to the 6th switch Q1～Q6 is switched on or switched off according to first to the 6th control signal Vg1～Vg6, just can obtain three-phase sine-wave output from inverter 7.
Frequency instruction and voltage instruction form circuit 10, as shown in Figure 4, comprising: the incoming line 9a of voltage detecting circuit 9 output valves that detects the smmothing capacitor 6 of Fig. 1 in order to input, reference voltage generating circuit 41, the first subtracters 42, compensator 43, limiter 44, second subtracter 45, voltage instruction value forms circuit 46, power cut detection circuit 47, accelerating time is determined circuit 48, frequency determines that with reference generating circuit 49, correction value produces circuit 50, and the 3rd subtraction circuit 51.
Below, with reference to Fig. 5 of displayed map 1 to Fig. 3 each several part voltage status, the frequency instruction of Fig. 4 and voltage instruction are produced circuit 10 elaborate.
Power cut detection circuit 47 is connected in input terminal 4a, 4b, shown in Fig. 5 (A), when specified level shown in the amplitude of the input voltage vin between input terminal 4a, the 4b is lower than during t1～t3, the low level signal Ta of the expression power down mode shown in the output map 5 (C).
Reference voltage generating circuit 41 produces when just often being non-the power failure and detects the suitable reference voltage V dcr of voltage Vdc with smmothing capacitor 6.An input terminal of first subtracter 42 connects with lead 9a, and another input terminal connects with reference voltage generating circuit 41.Carrying out the output of first subtracter 42 of Vdcr-Vdc computing, is zero or less value when AC power 3 is normally promptly switched on, and increases in t1～t3 outage.
The compensator 43 that is connected with first subtracter 42 is made of for example proportional integral (PI) compensator, and it is made smoothing processing to the output of subtracter 42 and exports then.The limiter 44 that compensator 43 is connected is limited the difference signal Δ Vdc after the compensation, and the lower limit of inverter output frequency is exported Δ Vf then during with definite the power failure.Capacitor detects voltage Vdc, will descend fast if can not implement control in apparatus of the present invention, thereby the action that makes inverter 7 and pwm control signal form circuit 8 can not continue to keep.To this, in the present embodiment, by the regeneration action reduction of the voltage Vdc of smmothing capacitor 6 is suppressed, shown in Fig. 5 (E).The output of first subtracter 42 begins slow increase from the moment t1 that power failure shown in Figure 5 begins, because of the effect of limiter 44 is restricted to maximum Vmax.Have again, the occasion that interruption duration is short, might limiter 44 also before the effect with regard to power recovery.
Frequency is determined to produce circuit 49 with fiducial value, produces the frequency shown in Fig. 5 (G) and determines to use fiducial value Vfr.This frequency is determined with fiducial value Vfr suitable with the desired value of the output frequency of inverter 7 just often.The output frequency of inverter 7 is according to determining the variation with fiducial value Vfr.
Correction value produces circuit 50, follows power cut detection circuit 47, accelerating time to determine that circuit 48 is connected with compensator 43, and it produces the correction value Vfc shown in Fig. 5 (H), and this value is decided by three parts that it connects.Correction value Vfc is zero increase obliquely from revising fiducial value synchronously in the initial of outage Ta of t1～t3 of Fig. 5 (C), falls obliquely during the t3～t4 that has a power failure after finishing.Length during t3～t4 determines that by the accelerating time circuit 48 is definite arbitrarily.Be to slow down to revise the interval during t1～t3 of Fig. 5 (H), Tb is that the acceleration correction is interval during t3～t4.The value Vfacc of accelerating period Tb shown in t3～t4 that correction value Vfc comprised of Fig. 5 (H) is determined by following formula.
Vfacc＝K/(At)
In the formula, K represents the compensator coefficient that compensator 43 provides, and t represents the accelerating time till the inverter target frequency, and A represents accelerator coefficient.The available Kt of the variation of outage Ta correction value represents.Have, COEFFICIENT K has the value corresponding with the output level of compensator 43 again.
The 3rd subtracter 51 deducts the correction value Vfc shown in Fig. 5 (H) from the fiducial value Vfr of Fig. 5 (G), the correction fiducial value Vfrc that obtains Fig. 5 (I) delivers to second subtracter 45.
The voltage instruction of Fig. 4 forms circuit 46, is made up of level-conversion circuit 52, corrector 53, correction voltage generation circuit 54, RC time constant circuit 55.Level-conversion circuit 52 is connected with lead 20, and the level of its conversion frequency command voltage Vf1 makes it to be fit to the level of voltage instruction voltage V1.By this conversion, obtain and the proportional voltage Vv1 of Vf1.Revise voltage generation circuit 54, produce the correction voltage Vc that is lower than voltage instruction voltage V1 just often.This revises the lower limit of condenser voltage Vdc when voltage Vc is definite to have a power failure.Corrector 53 connects with level-conversion circuit 52, correction voltage generation circuit 54 and power cut detection circuit 47; It is made of switching circuit, and this circuit is selectively with the correction voltage Vc during t1～t3 of Fig. 5 output, during beyond this selectively with the output Vv1 output of level-conversion circuit 52.Therefore, before the t1 of Fig. 5 with after the t3, export Vv1, during t1～t3, export Vc by the corrector 53 that this switching circuit constitutes.
Be connected in the RC constant circuit 55 of corrector 53, be also sometimes referred to as second corrector, it is changing the stepped signal that obtains from corrector 53 lentamente by the time constant during t1～t2 and during t3～t4 shown in Fig. 5 (K).The voltage instruction voltage V1 that obtains from time constant circuit 55 is sent to first, second and the 3rd multiplier 24,25,26 of Fig. 3 via lead 21.
If the voltage instruction voltage V1 of the accelerating period Tb behind outage Ta and the service restoration is changed as Fig. 5 (K), the output voltage V 0 of inverter 7 just changes thereupon pro rata.In a single day output voltage at outage Ta inverter 7 is depressed down, width turn-on time of each switch Q1～Q6 of inverter 7 just shortens, make to power supply to be restricted, thereby the ability of smmothing capacitor 6 discharges and also just is restricted as the induction motor 1 of load.And at outage Ta, induction motor 1 charges to smmothing capacitor 6 by the regeneration action in the action of inertia turning down, thereby makes the voltage reduction of capacitor 6 obtain inhibition shown in Fig. 5 (E).Its result even power failure or the electric voltage dropping of long period take place, also can continue to keep the work of inverter 7 under the less state of the inertia of load 13.Have, have a power failure again after the regeneration release, then condenser voltage Vdc will reduce, and inverter 7 quits work.
And, owing to the accelerating time Tb that determines by the accelerating time after circuit 48 can at random be set power recovery, suppress the rapid rising of the output frequency and the output voltage of inverter 7, the electric current I o of inverter 7 of flowing through rises shown in Fig. 5 (L) lentamente, thereby not only can prevent overcurrent, also can prevent superpotential generation.Its result has prevented the interruption of inverter 7 controls, makes it stably to remain in operation.
And,, can relatively easily form frequency instruction and voltage instruction with simple circuit owing to utilize the output of second subtracter 45 that produces frequency instruction voltage Vf1 to produce voltage instruction voltage V1.
(remodeling example)
The present invention is not limited to the above embodiments, and following various remodeling for example can be arranged.
(1) inverter 7 can adopt the inverter of other types such as single-phase bridge type inverter.
(2) though in Fig. 1 and Fig. 2, do not represent to add such circuit based on the feedback control circuit of the detected value of the output voltage of inverter 7 and frequency.
(3) will form the frequency instruction voltage Vf1 input voltage instruction forming circuit 46 that circuit obtains from frequency instruction among Fig. 4, but also not frequency of utilization command voltage Vf1 form voltage instruction voltage V1.
(4) frequency instruction voltage Vf1 and voltage instruction voltage V1 can adopt circuit shown in Figure 4 various circuit in addition to form.
(5) switch Q1～Q6 can adopt semiconductor switchs such as IGBT (insulated gate bipolar transistor) or FET.And diode D1～D6 also can be the diode-built-in of switch Q1～Q6.
(6) during power recovery, can only make also that the either party raises lentamente among frequency instruction voltage Vf1 and the voltage instruction voltage V1.
Claims (2)
1. the drive unit of an alternating current motor, this drive unit comprises: the AC input terminal (4a that is connected with AC power, 4b, 4c), be connected in the ac-dc conversion circuit (5) of above-mentioned ac terminal, be connected in the smmothing capacitor (6) between a pair of direct current lead-out terminal of above-mentioned ac-dc conversion circuit (5), be connected between above-mentioned smmothing capacitor (6) and the alternating current motor (1), and constitute renewable action, and comprise that the DC-AC conversion is with the DC-AC translation circuit (7) of switch, with the control circuit that the output frequency and the output voltage of described DC-AC translation circuit (7) are controlled; It is characterized in that:
Described control circuit comprises:
Condenser voltage testing circuit (9) is connected with above-mentioned smmothing capacitor (6);
Whether power cut detection circuit (47) is lower than the power down mode that detects of setting in order to the voltage according to above-mentioned AC input terminal, is connected with above-mentioned AC input terminal;
Reference voltage generating circuit (41), the reference voltage (Vdcr) of the voltage reference of the generation above-mentioned smmothing capacitor of expression (6);
Difference signal forms device (42,43,44), produce circuit (41) with said reference and be connected, and have the function of the difference signal (Δ Vf) of the difference that detects the reference voltage (Vdcr) that voltage (Vdc) and said reference voltage generation circuit (41) obtain that the expression of forming obtains from above-mentioned condenser voltage testing circuit (9);
Frequency is determined to produce circuit (49) with fiducial value, produces use and determines with fiducial value (Vfr) with the frequency of the output frequency of definite above-mentioned DC-AC translation circuit (7);
Correction value produces circuit (50), be connected with above-mentioned power cut detection circuit (47) and have above-mentioned power cut detection circuit (47) detect power down mode during, produce and drop to the function that is lower than above-mentioned AC power output frequency just often and the correction value of output voltage (Vf) in order to output frequency and output voltage with above-mentioned DC-AC translation circuit (7);
First subtracter (51) is determined to be connected and to have from the definite function that deducts above-mentioned correction value (Vfc) with fiducial value (Vfr) of said frequencies with reference generating circuit (49) and above-mentioned correction value generation circuit (50) with said frequencies;
Second subtracter (45) forms circuit with above-mentioned first subtracter (51) and above-mentioned difference signal and is connected and has a function that deducts above-mentioned difference (Δ Vf) from the output (Vfrc) of above-mentioned first subtracter (5);
Frequency instruction transmits lead (20), is used for the output of above-mentioned second subtracter (45) is transmitted as frequency command signal (Vf1), and is connected with above-mentioned second subtracter (45);
Voltage instruction value forms circuit (46), be connected with above-mentioned second subtracter (45) and have when power down mode, form in order to output voltage and remain in function than the voltage instruction value (V1) of just often low value with above-mentioned DC-AC translation circuit (7);
Voltage instruction transmits lead (21), forms circuit (46) with above-mentioned voltage instruction value and is connected;
Sine voltage generation device (22,23) transmits lead (20) with said frequencies instruction and is connected and produces the sine voltage with frequency that said frequencies command signal (Vf1) is shown;
Multiplier (24,25,26) transmits lead (21) with above-mentioned sine voltage generation device and above-mentioned voltage instruction and is connected and has a function that above-mentioned voltage instruction value (V1) and above-mentioned sine voltage are multiplied each other;
Saw-tooth wave generating circuit (27), generation has the sawtooth voltage that frequency is higher than the frequency of above-mentioned sine voltage; With
Comparison means (28,29,30), be connected with switch and have the output of above-mentioned multiplier and above-mentioned sawtooth voltage comparison, and form in order to control the function of above-mentioned DC-AC conversion with the pwm control signal of switch with above-mentioned multiplier, above-mentioned saw-tooth wave generating circuit and above-mentioned DC-AC conversion.
2. the drive unit of alternating current motor according to claim 1 is characterized in that:
Above-mentioned correction value produces circuit (50) also to be had when above-mentioned power down mode is eliminated, and produces the function of the correction value that improves gradually in order to output frequency and output voltage with above-mentioned DC-AC translation circuit (7).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28377/01 | 2001-02-05 | ||
| JP2001028377A JP2002233187A (en) | 2001-02-05 | 2001-02-05 | Apparatus and method for driving ac motor |
| JP28377/2001 | 2001-02-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1369961A CN1369961A (en) | 2002-09-18 |
| CN1201476C true CN1201476C (en) | 2005-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02102797 Expired - Fee Related CN1201476C (en) | 2001-02-05 | 2002-02-05 | Driving gear and driving method of a.c motor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2002233187A (en) |
| CN (1) | CN1201476C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4596866B2 (en) * | 2003-09-09 | 2010-12-15 | パナソニック株式会社 | Motor drive device |
| JP4910467B2 (en) * | 2006-04-21 | 2012-04-04 | 株式会社明電舎 | Variable speed control device for motor |
| CN103647462B (en) * | 2007-08-29 | 2017-04-26 | 三菱电机株式会社 | AC/DC converter, and compressor driving unit and air conditioner utilizing the same |
| KR102421551B1 (en) * | 2014-12-30 | 2022-07-20 | 삼성전자주식회사 | Motor driving apparatus and controlling method thereof |
| KR20170096530A (en) * | 2016-02-16 | 2017-08-24 | 동부대우전자 주식회사 | Apparatus and method for braking in washing machine employing pm synchronous motor |
| WO2017195255A1 (en) * | 2016-05-09 | 2017-11-16 | 三菱電機株式会社 | Inverter device and method for calibrating voltage command |
| JP6496371B2 (en) | 2017-08-28 | 2019-04-03 | ファナック株式会社 | Motor drive device in which step-up rate of PWM converter is controlled |
-
2001
- 2001-02-05 JP JP2001028377A patent/JP2002233187A/en active Pending
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2002
- 2002-02-05 CN CN 02102797 patent/CN1201476C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1369961A (en) | 2002-09-18 |
| JP2002233187A (en) | 2002-08-16 |
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