CN1038010C - Apparatus and method for realizing electric current controlling of speed changable motor - Google Patents
Apparatus and method for realizing electric current controlling of speed changable motor Download PDFInfo
- Publication number
- CN1038010C CN1038010C CN93116762A CN93116762A CN1038010C CN 1038010 C CN1038010 C CN 1038010C CN 93116762 A CN93116762 A CN 93116762A CN 93116762 A CN93116762 A CN 93116762A CN 1038010 C CN1038010 C CN 1038010C
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- Prior art keywords
- modulation
- time
- branch roads
- mentioned
- pwm
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
- H02M7/53876—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output based on synthesising a desired voltage vector via the selection of appropriate fundamental voltage vectors, and corresponding dwelling times
Abstract
A three-branch modulation mode PWM converter device is switched into a two-branch modulation mode converter device near a voltage saturation area to be used for controlling the current of a non-zero vector notch. The device comprises a PWM characteristic curve arithmetic component 31, a time data setting component 32, a time change-over switch 33, a time data setting component 41, a comparison circuit 45 and a change-over switch 47, wherein the time data setting component 32 sets three-branch regulating time data according to voltage vector time, and the time data setting component 41 sets two-branch regulating time data according to voltage vector time; the comparison circuit 45 compares zero vector time T0 with dead time to compensate setting values, and the change-over switch 47 outputs the data of the time data setting component 41 to the time change-over switch 33 when the zero vector time is decreased.
Description
The present invention relates to a kind of device and implementation method thereof of implementing the dynamo-electric current control of variable speed drive, improve near the current controling characteristic of voltage saturation of voltage type PWM converter current control system.
Fig. 1 expresses the variable speed drive device (January 17 nineteen ninety, the spy of application was willing to flat 2-7983 number) of working voltage type pwm converter.In Fig. 1,1 is to use the vector control parts of the data of speed or torque instruction and speed detection etc.; The 2nd, ACR (electric current) control assembly that carries out the Current Control computing according to the current-order of vector control parts; The 3rd, go out 3 PWM characteristic curves mutually by the voltage amplitude and the phase place ordering calculation of the space vector of voltage of ACR control assembly, the PWM characteristic curve generator of PWM instruction takes place according to the PWM characteristic curve; The 4th, the dead-time compensation circuit; The 5th, control utmost point signal circuit; The 6th, drive circuit; The 7th, inverter main circuit; The 8th, induction motor.Among Fig. 1, the 9th, voltage detector; The 10th, current controller; The 11st, speed detector; The 12nd, sample-and-hold circuit; When finishing, the A/D conversion keeps the output current of this moment synchronously and arriving with sampling inhibit signal in the middle of the O vector of PWM characteristic curve generator; The 13rd, the A/D converter; The 22nd, from spinner velocity W from speed detector 11
rWith slip angular velocity W
sDraw power supply speed W
oAdder.
Fig. 5 represents the square frame circuit of PWM characteristic curve generator 3, the 31st, and PWM characteristic curve arithmetic unit calculates from the ACR control assembly with approximate circule method, 1 vector voltage instruction V, from output voltage phase bit instruction Q
vWith 60 ° output voltage phase place Ф that the gap was limited and DC power supply voltage V
Dc, from PWM carrier cycle (PWM time) T
cThe PWM characteristic curve.Output differs the voltage vector time T of 60 ° of phase places
x, T
μWith O vector time T
o
The 32nd, the moment data that are used for 3 circuit modulation are worked out parts, in half PWM time T as shown in Figure 6
oIn/2, clamp pin O vector time T
oFive equilibrium voltage vector time T
x, T
μTwo-part time data, output time data T
1, T
2, T
3
The 33rd, moment data T
1, T
2, T
3Be transformed into each phase voltage T constantly
u, T
v, T
wMoment diverter switch.The 34th, ON/OFF commutation circuit, switching time T
u, T
v, T
wAnd export each phase voltage signal V
u, V
v, V
w(PWM characteristic curve).
And, also express among Fig. 5: the 35th, from the output phase θ of ACR control assembly
vPer 60 ° mode selection circuit; The 36th, reference phase output table is imported the output of per 60 ° mode selection circuit and is exported each reference phase Ф
λThe 37th, subtracter; From the output voltage phase theta
vDeduct per 60 ° base position phase theta
λAnd the output voltage phase place that is defined as 60 ° of intervals is outputed in the PWM characteristic curve arithmetic unit 31; The 38th, the switch option table is by the input control moment diverter switch 33 of per 60 ° mode selection circuit 35; The 39th, switch ON/OFF control circuit carries out current sampling when controlling the ON/OFF commutation circuit with the PWM time.
Calculate the said PWM characteristic curve with approximate circule method, O vector time T
oThe bisector time T
λ, T
μTwo parts and output, electric current connects at the characteristic breakpoint of PWM, and this mode (following so-called 3 branch road modulation systems) uprises output voltage, thus the narrowed width of O vector.
Once O vector breach is taken place in the narrowed width of O vector by dead-time compensation.The current phasor track of this moment moves to the big direction of radius.
Fig. 7 (Ren), (mouth) are expressed the vector before and after the O vector breach.In Fig. 7, shown in (mouth), move to the D point during the O vector of ordering by dead-time compensation B, breach appears at B point O vector, and when the D point early the O vector occurred, it is such that the track of current phasor just becomes Fig. 8.
In this case, the track of current phasor is though arrive [1], [2] are identical, and are elongated during [3].Therefore, current phasor carries out big moving.Because [4], [5], [6] are like that original, and the current phasor track (omitting among the figure) in the time of then Fig. 7 [Ren] of breach can not occurring with the O vector is compared, and just are present in to have only elongated state during [3] and on the parallel mobile position.[7] have only the state that the O vector increases during the vector and shorten; [8] during the O vector, the state of the O vector in should being in during [3] is elongated; Its result, the end of [9] is consistent with the starting point of [1].
Just, O vector breach is once produce, and the final tracing point of current phasor becomes with the part that does not have the O vector and equates, the track in then during this is parallel mobile to the big direction of electric current radius.Thus, become big than the breach in the O vector of the current integration value in during this less than electric current.Thus, because be the PWM characteristic curve that same electrical is pressed into branch, then that electric current is become is inequality owing to the insertion place of O vector.
In view of existing such problem, the objective of the invention is: a kind of devices and methods therefor of implementing the variable speed drive machine is provided, near as the voltage saturation of former state, the PWM characteristic curve is switched to 2 branch road modulation systems from 3 branch road modulation systems by the ACR control system, improve voltage saturation and near ACR control characteristic.
To achieve these goals, the device of the Current Control of enforcement variable speed drive machine of the present invention, (comprising according to the voltage instruction of Current Control parts and the output voltage characteristic PWM characteristic curve of bit arithmetic 3 phase PWM arithmetic unit mutually, work out parts according to including the 3 branch roads modulation of working out the data that are used for the modulation of 3 branch roads with the voltage vector time of O vector time of this arithmetic unit institute computing with data constantly, these moment data are carried out each time diverter switch of switching mutually constantly) in the PWM converting means, be provided with: the moment data that are used for the modulation of 2 branch roads of working out the moment data of 2 branch road modulation systems according to the above-mentioned voltage vector time are worked out parts, more above-mentioned O vector time and dead-time compensation set point and when the O vector time diminishes, export the comparison circuit of 3 branch roads/2 branch roads modulation switching signal, switch the modulation diverter switch that is used for above-mentioned 3 branch roads moment data of modulating and the moment data that are used for the modulation of 2 branch roads and exports to above-mentioned moment diverter switch according to the switching signal of this comparison circuit.
In comparison circuit, preferably has hysteresis characteristic.Comparison circuit preferably compare with proportional time of dead-time compensation set point together by the O vector time.
Output voltage uprises, and O vector breach just takes place in the PWM characteristic curve of 3 branch road modulation systems the narrowed width of O vector.Comparison circuit is exported to the modulation diverter switch to switching signal comparing with the dead-time compensation set point from the O vector time of PWM characteristic curve arithmetic unit before O vector breach takes place.The modulation switching device shifter is switching to the moment data of 2 branch road modulation systems to the moment data of 3 branch road modulation systems, exports to moment diverter switch, thereby is switching to the characteristic Current Control of the PWM that utilizes 2 branch road modulation systems.
2 branch road modulation systems are compared with 3 branch road modulation systems, just have current pulsation to become about 2 times shortcoming, and the width during the O vector becomes 2 times, although then output voltage uprises, also can not have the Current Control of O vector breach.
If in comparison circuit, have hysteresis characteristic, near voltage saturation, just can between modulation of 3 branch roads and the modulation of 2 branch roads, not switch back and forth continually.
If the time of comparing with the O vector time in the comparison circuit as the dead-time compensation value with ratio on duty, then just can adjust switching time that 3 branch roads are modulated and 2 branch roads are modulated corresponding to voltage instruction by the change ratio.
With reference to accompanying drawing embodiments of the invention are described.Fig. 2 represents PWM characteristic curve generator.Use identical label to omit the explanation of its repetition with above-mentioned existing identical component part shown in Figure 5.
In Fig. 2, the 32nd, the moment data that are used for the modulation of 3 branch roads are worked out parts; The 41st, working out parts 42 by 42,43 moment data of forming that are used for the modulation of 2 branch roads is that data are worked out parts constantly; Input is from the voltage vector time T of PWM characteristic curve arithmetic unit
λ, T
μWith O vector time T
o, O vector time T
oConcentrate on time T
λ, T
μAfterwards, output time data T
1, T
2, T
3The 43rd, data are worked out parts constantly; Import identical time T
λ, T
μ, T
o, O vector time T
oConcentrate on time T
λ, T
μBefore, output time data T
1, T
2, T
3
The 45th, by the comparison circuit that hysteresis comparator is formed, T during the O vector of input PWM characteristic curve arithmetic unit 31
oMultiply by the value KTdly of the COEFFICIENT K in the ratio circuit with dead-time compensation set point Tdly, at T
oExport 3 branch roads/2 branch roads modulation switching signal during＜KTdly.
The 46th, the switch option table is imported the 3 branch roads/output of 2 branch roads modulation switching signal circuit 45 and the output of per 60 ° mode selection circuit and the output of switch ON/OFF control circuit 39, and it exports 3 branch roads/2 branch roads modulation switch data.
The 47th, by the modulation diverter switch of the Data Control of switch option table 46, when 3 branch roads are modulated, data are constantly worked out the moment data T of parts 32
1, T
2, T
3As its former state T
1', T
2', T
3' output, from the PWM characteristic curve of ON/OFF commutation circuit 34 output branch road modulation systems.And when 2 branch roads were modulated, data were worked out the moment data T of parts 42,43 constantly
1, T
2, T
3Be altered to: the O vector time T of existing PWM half period shown in Figure 3
o2 five equilibriums and be divided into the voltage vector time T
λ, T
μTwo parts.That is:
(1) the O vector time during half PWM is set in time T same as before
λSurvey or T
μThe edge of surveying;
(2) the O vector time during next half PWM continues with during half PWM, to determine in time T
λ, T
μWhich side;
(3) and the point of reference object, change the point of in 60 ° of intervals of every firepower voltage-phase, concentrating the O vector time;
Data according to switch option table 46 are switched, output time data T
1', T
2', T
3', from the PWM characteristic curve (be equivalent to electricity opinion D, No. 11,109 volumes are put down into the 2 branch roads modulation of P809 in the first year) of ON/OFF commutation circuit 34 outputs 2 branch road modulation systems.
At this moment, if current sampling carries out preferably by existing like that with every PWM half period, the center of gravity during 1 PWM week of the such current locus of Fig. 4 is taken a sample.Thus, just can intactly use the ACR control system of existing Fig. 1 (special hope flat 2-7983 number).
The present invention is had the effect of putting down in writing below by above-mentioned the formation.(1) width during making the O vector is expanded into 2 times to the PWM characteristic curve being switching to 2 branch road modulation systems near the voltage saturation the convertor device of 3 branch road modulation systems, thereby O vector breach can not take place near voltage saturation, improves current controling characteristic.
Fig. 1 is the frame circuit diagram of expression variable speed drive machine;
Fig. 2 is the frame circuit diagram of the function of the PWM characteristic curve generator that relates to of the expression embodiment of the invention;
Fig. 3 is the O vector allocation plan of explanation embodiment;
Fig. 4 is the trajectory diagram of the current phasor of explanation embodiment;
Fig. 5 is the frame circuit diagram of the function of the existing PWM characteristic curve generator of expression;
Fig. 6 is explanation time data and figure of data constantly in 3 branch roads modulation;
Fig. 7 is the figure that shows that the O vector moves;
Fig. 8 is the figure of the current phasor track that shows that the O vector moves.
Label representative in the accompanying drawing be:
1, vector control parts 2, Current Control parts; 3, PWM characteristic curve generator; 4, dead-time compensation circuit; 5, control utmost point signal circuit; 6, drive circuit; 7, inverter main circuit; 8, induction motor; 11, speed detector; 12, sample-and-hold circuit; 31, PWM characteristic curve arithmetic unit; 32, the moment data that are used for the modulation of 3 branch roads are worked out parts; 33, moment diverter switch; 34, ON/OFF commutation circuit; 35, per 60 ° of mode selection circuits; 36, per 60 ° of reference phases output table; 38, switch option table; 39, switch ON/OFF control circuit; 41, the moment data that are used for the modulation of 2 branch roads are worked out parts; 44, ratio circuit; 45, comparison circuit; 46, switch option table; 47, modulation diverter switch.
Claims (4)
1. device in order to the Current Control of carrying out the variable speed drive machine comprises:
A pwm converter device, this pwm converter device have a PWM property calculation curve device; In order to the instruction of the voltage amplitude of response current control assembly and output voltage mutually bit instruction calculate 3 phase PWM characteristic curves; A moment data setting device that is used for the modulation of 3 branch roads, the voltage vector time that responds the O vector time of above-mentioned PWM characteristic curve calculation element calculating is set the moment data that are used for the modulation of 3 branch roads; A clock switch device switches in order to these moment data are carried out phase time,
It is characterized in that:
Be used for the moment data setting device of 2 branch roads modulation, respond the above-mentioned voltage vector time, set the moment data that are used for the modulation of 2 branch roads;
Comparator device is to the above-mentioned O vector time with the dead-time compensation set point compares and export 3 branch roads/2 branch roads modulation switching signal when the O vector time diminishes;
The modulation diverter switch according to the switching signal of this comparison circuit, is switched the above-mentioned moment data that are used for the moment data of 3 branch roads modulation and are used for the modulation of 2 branch roads, and the result of switching is exported to above-mentioned moment diverter switch,
3 branch roads, 2 branch road modulation systems switch with the size of bit instruction mutually according to above-mentioned voltage amplitude.
2. the device in order to the Current Control of carrying out the variable speed drive machine according to claim 1 is characterized in that comparison circuit has hysteresis characteristic.
3. the device in order to the Current Control of carrying out the variable speed drive machine according to claim 1 and 2 is characterized in that, be multiply by the value of ratio the time of comparing with the O vector time in the comparison circuit as the dead-time compensation set point.
4. method in order to the Current Control of carrying out the variable speed drive machine may further comprise the steps:
The voltage amplitude instruction that utilizes pwm converter device response current control assembly and output voltage phase place command calculations 3 be the PWM characteristic curve mutually;
The voltage vector time of the zero vector time that response is calculated is set the moment data that are used for the modulation of 3 branch roads;
Utilizing moment diverter switch that these moment data are carried out phase place switches constantly;
It is characterized in that, may further comprise the steps:
The moment data that are used for the modulation of 2 branch roads according to above-mentioned voltage vector time set, to the above-mentioned zero vector time with the dead-time compensation set point compares and export 3 branch roads/2 branch roads modulation switching signal when its comparative result diminishes, according to this comparative result, export above-mentioned modulation switching signal and switch the above-mentioned moment data that are used for the time data of 3 branch roads modulation and are used for the modulation of 2 branch roads, switching result is exported to the modulation diverter switch of the above-mentioned diverter switch that possesses; 3 branch roads, 2 branch road modulation systems switch with the size of bit instruction mutually according to above-mentioned voltage amplitude.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4006152A JPH05199796A (en) | 1992-01-17 | 1992-01-17 | Current control system for adjustable speed driving device |
| CA002142618A CA2142618C (en) | 1992-01-17 | 1993-07-16 | Apparatus for carrying out current control for variable speed driver and method for carrying out current control therefor |
| EP93916172A EP0661796B1 (en) | 1992-01-17 | 1993-07-16 | Apparatus and method for controlling current of variable speed driver |
| US08/193,052 US5623192A (en) | 1992-01-17 | 1993-07-16 | Apparatus for carrying out current control for variable speed driver and method for carrying out current control therefor |
| PCT/JP1993/000986 WO1995002921A1 (en) | 1992-01-17 | 1993-07-16 | Apparatus and method for controlling current of variable speed driver |
| CN93116762A CN1038010C (en) | 1992-01-17 | 1993-07-16 | Apparatus and method for realizing electric current controlling of speed changable motor |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4006152A JPH05199796A (en) | 1992-01-17 | 1992-01-17 | Current control system for adjustable speed driving device |
| CA002142618A CA2142618C (en) | 1992-01-17 | 1993-07-16 | Apparatus for carrying out current control for variable speed driver and method for carrying out current control therefor |
| PCT/JP1993/000986 WO1995002921A1 (en) | 1992-01-17 | 1993-07-16 | Apparatus and method for controlling current of variable speed driver |
| CN93116762A CN1038010C (en) | 1992-01-17 | 1993-07-16 | Apparatus and method for realizing electric current controlling of speed changable motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1097529A CN1097529A (en) | 1995-01-18 |
| CN1038010C true CN1038010C (en) | 1998-04-08 |
Family
ID=27427213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93116762A Expired - Fee Related CN1038010C (en) | 1992-01-17 | 1993-07-16 | Apparatus and method for realizing electric current controlling of speed changable motor |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1038010C (en) |
| CA (1) | CA2142618C (en) |
| WO (1) | WO1995002921A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010119929A1 (en) * | 2009-04-16 | 2010-10-21 | 株式会社明電舎 | Method of controlling power conversion device |
| CN114221589B (en) * | 2021-12-08 | 2023-09-29 | 北方工业大学 | Pulse injection multi-mode modulation switching method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5036228A (en) * | 1988-05-31 | 1991-07-30 | Yamaha Corporation | Temperature compensation circuit for negative impedance driving apparatus |
| US5184057A (en) * | 1989-09-14 | 1993-02-02 | Hitachi, Ltd. | Control method and device for ac motor |
| US5204607A (en) * | 1989-09-07 | 1993-04-20 | Siemens Aktiengesellschaft | Process for correcting the reference flux of a converter-powered multi-phase machine and circuit for implementing the process |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02206398A (en) * | 1989-02-04 | 1990-08-16 | Toyo Electric Mfg Co Ltd | Inverter control system |
| JPH03118793A (en) * | 1989-09-29 | 1991-05-21 | Isao Takahashi | Inverter controller |
-
1993
- 1993-07-16 CA CA002142618A patent/CA2142618C/en not_active Expired - Fee Related
- 1993-07-16 WO PCT/JP1993/000986 patent/WO1995002921A1/en active IP Right Grant
- 1993-07-16 CN CN93116762A patent/CN1038010C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5036228A (en) * | 1988-05-31 | 1991-07-30 | Yamaha Corporation | Temperature compensation circuit for negative impedance driving apparatus |
| US5204607A (en) * | 1989-09-07 | 1993-04-20 | Siemens Aktiengesellschaft | Process for correcting the reference flux of a converter-powered multi-phase machine and circuit for implementing the process |
| US5184057A (en) * | 1989-09-14 | 1993-02-02 | Hitachi, Ltd. | Control method and device for ac motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1097529A (en) | 1995-01-18 |
| CA2142618A1 (en) | 1995-01-26 |
| WO1995002921A1 (en) | 1995-01-26 |
| CA2142618C (en) | 1998-10-27 |
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