CN1059057C - Quasi-superconductor speed stabilizing system - Google Patents
Quasi-superconductor speed stabilizing system Download PDFInfo
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- CN1059057C CN1059057C CN98124016A CN98124016A CN1059057C CN 1059057 C CN1059057 C CN 1059057C CN 98124016 A CN98124016 A CN 98124016A CN 98124016 A CN98124016 A CN 98124016A CN 1059057 C CN1059057 C CN 1059057C
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Abstract
The present invention uses a method for compensating the influence of resistance loss in an electric motor for forming a quasi-superconductor speed stabilizing system which is applied to a direct current electric motor or an alternating current electric motor speed stabilizing system controlled by a frequency converter so that the speed drop of the electric motor, which is resulted form increased load and increased resistance loss is compensated. In a direct current electric motor system, a signal obtained through sampling armature current controls a pulse width modulator, and voltage supplied to an armature is regulated. In an alternating current electric motor, current at the direct current side of the frequency converter is sampled. Through calculating and regulating the circuit, the amplitude of voltage output by the frequency converter is regulated, or the output frequency and the amplitude of the frequency converter are simultaneously regulated. Finally, the rotary speed of the electric motor is stable.
Description
The present invention relates to motor speed stabilization system's formation, particularly do not have speed to detect the formation of the speed stabilizing system of feedback element.
In the prior art to the formation of motor speed stabilizing system, nearly following basic schemes:
1, in the direct current machine circuit, detects the variation of armature back-emf and give feedback compensation.Recorder speed stabilizing system for example.
2, in the alternating current machine circuit, detect voltage, electric current or the magnetic flux vector of motor and give feedback compensation.For example in the alternating current machine vector control speed stabilizing system of using frequency converter.
3, in any motor, on the axle of motor, speed probe is installed, carry out speed feedback, thereby carry out speed stabilizing.For example in common accurate speed stabilizing servo system.
4, directly use synchronous machine and stepping motor, make the motor speed strictness synchronous with supply frequency or power pulse.
The accuracy that method 1,2 detects, there is certain defective in the integrity of compensation on the complexity that system forms.Therefore accurate system often adopts method 3, but method 3 will be adorned speed probe, generally adopts the encoder of 1024～4096 pulse/commentaries on classics, the price height, and method 4 can only just can be used under special occasions.
On June 24th, 1998, Chinese patent CN2285031Y discloses a kind of " direct current machine chopper speed regulating device ", is characterized in that this device possesses regenerative braking and two kinds of functions of dynamic braking simultaneously.But the stability of keeping rotating speed because of load change during not to speed governing is taken measures, thereby this device is relatively poor to the speed stabilizing effect of motor.
On August 2nd, 1998, Chinese patent CN1106175A disclosed Japanese patent " power conversion system ", was characterized in introducing a kind of AC-DC-AC power conversion system.Single-phase alternating current is transformed into direct current, again direct current is transformed into three-phase alternating current, used active filter in parallel in DC side with main filter capacitor, can absorb the fluctuating power of single phase alternating current power supply effectively, the utilance of power converter is improved, and the capacity of DC side filter capacitor significantly reduces, and has eliminated the beat phenomenon of frequency converter output, reduced the vibration and the noise of motor, made system have good stabilized voltage characteristic and quite successfully eliminated the voltage ripple influence of single phase poaer supply.But, aspect speed stabilizing, having used the speed detector PG that is connected with motor shaft, the speed probe that has that is equivalent to narrate in above " 3 " is made the speed stabilizing system of speed feedback, makes that installation is complicated, on the high side, is difficult to promote.
The objective of the invention is to make the speed stabilizing of motor that the feasible new method of a kind of simple and stable be arranged, open new approaches for the designer of speed stabilizing system by a kind of new speed stabilizing method is provided.
Technical solution of the present invention is such (seeing also Fig. 3 and Fig. 4):
For direct current machine speed stabilizing loop: an armature is arranged, the diode and the inductance of the sampling element of armature supply, signal processing circuit, pulse width modulation circuit and the continuous usefulness of electric current; (+) end of one termination DC power supply U1 of sampling element (R) and (2) end of signal processing circuit (A), (1) end of another termination signal processing circuit (A) of sampling element (R) and the input of pulse-width modulator (B), the signal termination frequency instruction of signal processing circuit (A), the modulated terminal of the output termination pulse-width modulator (B) of circuit (A), the negative pole of the output terminating diode (D) of pulse-width modulator (B) and inductance (L), (+) end of another termination armature of inductance (L), (-) end of the positive pole of (-) the end diode (D) of armature and DC power supply U1.
For the Frequency Converter Control alternating current machine speed stabilizing loop with intermediate dc loop, its formation is to have a three phase alternating current motor, one to place the current sampling element of frequency converter DC loop, a computing circuit, a carrier signal generator/amplitude adjusting circuit, a three-phase sine-wave generation/frequency regulating circuit, a sinusoidal wave amplitude adjusting circuit, a PWM to form circuit and a drive circuit; Three phase alternating current motor connects the output of frequency converter inverter circuit, two inputs of computing circuit (E) access the two ends of sample element R, the output of computing circuit (E) is carried wave generator/amplitude adjusting circuit (F), circuit (F) output termination PWM forms circuit (T), the input termination frequency command signal of three-phase sine-wave generation/frequency regulating circuit (H), its output (1) connects computing circuit (E), output (2) connects sinusoidal wave amplitude adjusting circuit (K), the output termination PWM of circuit (K) forms circuit (T), the output termination drive circuit (N) of circuit (T), circuit (N) output termination frequency converter inverter circuit.
The quasi-superconductor speed stabilizing system principle is described as follows: general rotating speed of motor increases with load and descends, and its main cause is that motor internal exists resistance.Now manage to simulate the motor made from superconductor, superconductor does not have resistance drop because of there not being resistance loss, and rotating speed of motor is not increased with load, and electric current strengthens and descends.Promptly form so-called quasi-superconductor speed stabilizing system.
The speed stabilizing system of quasi-superconductor can be applicable to direct current machine and alternating current machine, but is very different on the formation of its system.The basic comprising of these two kinds of quasi-superconductor speed stabilizing systems below summarily is described.
In the direct current machine speed stabilizing system, the quasi-superconductor scheme is that the current signal in the motor main circuit is detected, be used to control the voltage of supplying with motor, when the load increase and electric current when increasing, the voltage of supplying with motor is also raise, compensated the loss that the motor internal resistance drop causes, kept motor speed and change in more among a small circle.
For Frequency Converter Control alternating current machine speed stabilizing loop with intermediate dc loop, as everyone knows, the slippage of alternating current machine (referring to respond to asynchronous machine here) strengthens with load, when frequency converter is fixed in a frequency, the rotating speed of alternating current machine in fact also increases with load and descends, and the increase of slippage also is because motor internal exists the conductor self-resistance to cause.It may be noted that, exist idle component in the winding current of alternating current machine, and idle component is with electric machine frequency, multiple parameter influence such as voltage, load, the foundation whether its value can not be directly increases and reduce as the load of motor, can not directly as direct current machine, control the voltage of motor simply, thereby reach the purpose of speed stabilizing with the ac current signal of this motor.
Yet main points of the present invention just are to obtain the active current of electrical consumption as sample intelligence from the direct current major loop of frequency converter.We might as well regard a direct current machine to (frequency converter+alternating current machine) as.Certainly its not exclusively equivalence, but in the practical application, can think like this.Because the characteristic of alternating current machine, require frequency converter under normal circumstances voltage change with frequency with being directly proportional.Thereby the current signal of obtaining from frequency converter direct current major loop must perform calculations with frequency signal, and this also is another main points of the present invention, and this is a kind of division arithmetic, and promptly sampled signal is divided by frequency.Signal after the computing goes the PWM output of control of conversion device.Its control mode has three kinds: be respectively the amplitude that changes inner triangular wave, and then change output voltage; Change inner sinusoidal wave amplitude, and then change output voltage; And, output voltage is changed with frequency by the rule that v/f equals constant.
The speed stabilizing system that can the pressure drop of small electromotor internal resistance causes rotating speed to descend that obtains therefrom, we claim that it is a quasi-superconductor speed stabilizing system.This system constitutes and the concrete effect of implementing, and has obtained confirming on direct current and alternating current machine and actual the use.This scheme makes the formation of speed stabilizing system simple and easy, particularly under alternating current machine-frequency converter application scenario, and the formation of its converter circuit, calculation and analysis and understanding all seem fresh and new, and be quite with practical value.
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
Fig. 1 is basic quasi-superconductor schematic diagram.
Fig. 2 is the adding schematic diagram of quasi-superconductor negative resistance.
Fig. 3 is the actual formation example of direct current machine quasi-superconductor speed stabilizing system.
Fig. 4 is under the use occasion of alternating current machine frequency converter, with the inner triangular wave amplitude of the signal controlling after sampling, the computing, and then the method for change output voltage.
Fig. 5 is under the use occasion of alternating current machine frequency converter, with the inner sinusoidal wave amplitude of the signal controlling after sampling, the computing, and then the method for change output voltage.
Under the use occasion of Fig. 6 alternating current machine frequency converter, with the signal after the sampling computing, control v/f, the method that output voltage is changed with frequency.
Fig. 7 shows a formation example of signal processing circuit among Fig. 3 embodiment;
Fig. 8 shows a formation example of computing circuit among Fig. 4,5,6 embodiment;
Fig. 9 shows a formation example of sinusoidal wave amplitude adjusting circuit among Fig. 5 embodiment;
Internal circuit for other block diagrams, can find from relevant professional book and frequency converter data, maybe can find similar circuit, the coupling method of itself and block diagram of the present invention is also known by general professional and technical personnel, do not belonged to the scope of the invention, no longer described in detail.
Below respectively legend is illustrated one by one.
For direct current machine, rotating speed
, when armature resistance r=0 (during superconducting motor),
As long as supply voltage U, air-gap flux φ constant (Ce is a constant), rotation speed n is just constant.And it doesn't matter with load current I.This just illustrates that superconducting motor has the characteristic of speed stabilizing.
But in fact superconductor can't be practical, and we have resistance to exist by the actual motor that runs into, but we introduce one (r), with it with in the armature+r offsets, so just can regard this electric motor loop as is a superconducting motor loop, and is named quasi-superconductor, sees Fig. 1.
Among Fig. 2, if make voltage U
2Increase with load current I raises with being directly proportional, makes U
2Variation meet following formula:
U
2＝U+Ir
In the formula: U
2---be added to the voltage on the armature;
R---armature resistance;
U---the voltage on the desirable armature (not having internal resistance).
A variable resistor r ' is designed to have negative resistance charactertistic, and r '=-r, so, since the U=constant, motor speed
Specifically, the basic ideas of technical solution of the present invention provide a kind of system schema that forms negative resistance charactertistic, and this is very different to direct current and alternating current machine scheme.But they all are to utilize the meritorious composition that detects the motor load electric current, and make the requirement variation of the voltage of supply motor by negative resistance with control circuit.
What will particularly point out here is that the acquisition of negative resistance is a broad sense, and its method can be:
1: the voltage of supplying with motor is changed by the negative resistance requirement, motor internal resistance composition is compensated by negative resistance, reach the stable purpose of motor speed.
2: when alternating current machine uses frequency converter, make frequency and the voltage of supplying with motor change the rotating speed decline that comes the small electromotor internal resistance to cause simultaneously, reach the purpose that motor speed is compensated.
Certainly, this compensation is suitable, and is limited, can not overcompensation take place and causes the instability of system.
As first technical scheme is the application in the direct current machine speed stabilizing system of quasi-superconductor speed stabilizing system.As shown in Figure 3.
This is a direct current machine speed stabilizing system, and the armature of a motor is arranged, the diode (D) of the sampling element of armature supply (R), signal processing circuit (A), pulse width modulation circuit (B) and the continuous usefulness of electric current and inductance (L); (+) end of one termination DC power supply U1 of sampling element (R) and (2) end of signal processing circuit (A), (1) end of another termination signal processing circuit (A) of sampling element (R) and the input of pulse-width modulator (B), the signal termination frequency instruction of signal processing circuit (A), the modulated terminal of the output termination pulse-width modulator (B) of circuit (A), the negative pole of the output terminating diode (D) of pulse-width modulator (B) and inductance (L), (+) end of another termination armature of inductance (L), (-) end of the positive pole of (-) the end diode (D) of armature and DC power supply U1; Voltage U on its armature
2Provided by pulse-width modulator, its mean value of unidirectional pulse voltage is U
2U
2Changing Pattern increase with armature supply I.
U
2＜U+Ir
(r is the resistance of armature here, and U is the voltage that desirable armature should obtain, if U
2=U+Ir or U
2＞U+Ir is with instability)
Very the resistance of low resistance (R) is used for current sampling, and sampled signal is the control impuls width modulator after signal processing circuit, and output pulse width is widened when electric current I increases, and makes average voltage U
2Rise, motor obtains voltage and rises, and motor speed is compensated.Among Fig. 3, diode (D) and inductance (L) are for the continuous set element of the electric current that makes the motor of flowing through.
Here it needs to be noted: sampling element (R), pulse-width modulator (B) can be arranged on the positive and negative any side of DC power supply, as long as connect with the armature major loop; Inductance (L), diode (D) also can be arranged on the positive and negative any side of armature, as long as connect with armature, guarantee that armature supply can be continuously.
As second technical scheme is the application of quasi-superconductor technology in having the Frequency Converter Control alternating current machine speed stabilizing system in intermediate dc loop, as shown in Figure 4.
This speed stabilizing system has a three phase alternating current motor, one to place current sampling element (R), a computing circuit (E), a carrier signal generator/amplitude adjusting circuit (F), a three-phase sine-wave generation/frequency regulating circuit (H), a sinusoidal wave amplitude adjusting circuit (K), a PWM of frequency converter DC loop to form a circuit (T) and a drive circuit (N); Three phase alternating current motor connects the output of frequency converter inverter circuit, two inputs of computing circuit (E) access the two ends of sample element (R), the output of computing circuit (E) is carried wave generator/amplitude adjusting circuit (F), circuit (F) output termination PWM forms circuit (T), the input termination frequency command signal of three-phase sine-wave generation/frequency regulating circuit (H), its output (1) connects computing circuit (E), output (2) connects sinusoidal wave amplitude adjusting circuit (K), the output termination PWM of circuit (K) forms circuit (T), the output termination drive circuit (N) of circuit (T), circuit (N) output termination frequency converter inverter circuit.
In the stator current of AC induction motor, owing to have the reactive current component, so its size can not accurately reflect the variation of motor active load.Yet in the inner direct current major loop of frequency converter, the current signal of obtaining on the sampling element (R) need not to have reflected directly that through computing this frequency converter connects the variation of motor active power.
The pulse signal that pulse width modulation circuit produces in the frequency converter is subjected to the influence of sinusoidal wave amplitude and two parameters of carrier amplitude.Wherein any one all can change the output of pulse-width modulation (PWM) circuit in change, and then the inner three-phase inverting circuit of change frequency converter is delivered to the voltage on the motor.
Among Fig. 4, the voltage drop signal that the electric current on the sampling element (R) causes behind computing circuit, is delivered to carrier amplitude and is adjusted circuit, and the essence of this computing circuit is a divider.Because in the frequency converter, under motor load moment permanence condition, be directly proportional with frequency by the current value on the sampling element (R), reduce in order to make the feedback quantity difference that obtains under the various frequencies, just this divider must be set, with the voltage drop value on (R) divided by frequency.Divider can be provided with 1 grade or 2 grades, is provided with and obtains more compensation when 2 grades of dividers can make low frequency, to satisfy the needs that common frequency converter low speed moment strengthens.
The speed stabilizing process of circuit shown in Figure 4 is as follows:
When the load increase of motor, make electric current I increase in the frequency converter DC loop, sampling element (R) is gone up the current feedback signal that takes out, and eliminates the influence of frequency and empty load of motor electric current through computing circuit; Go to adjust the amplitude of carrier wave in the frequency converter after the computing.Carrier amplitude was turned down when electric current I increased, and low carrier wave output is widened the pulsewidth of pulse-width modulation (PWM) circuit output.So behind the driving power inverter circuit, the voltage that motor is obtained promotes.Motor speed is promoted.Compensated because of motor windings resistance, the rotating speed that rotor resistance causes descends.
As the 3rd technical scheme, be that with second scheme difference it is to utilize sampling element R to go up the current feedback signal that takes out, and removes the inner sinusoidal wave amplitude of control of conversion device.Sinusoidal wave amplitude was heightened when electric current I increased, and high sine wave is widened the pulsewidth of pulse-width modulation (PWM) circuit output.So behind the driving power inverter circuit, the voltage that motor is obtained promotes.
As the 4th technical scheme, be that with second, third scheme difference it is to utilize feedback signal to go the control of conversion instruction, the sine wave freuqency and the sine amplitude of frequency converter inside are changed simultaneously, thereby reach the envelope frequency and the effective pulsewidth that change PWM, frequency and the voltage amplitude delivered on the motor are changed simultaneously, adjusted rotating speed of motor.
If the current signal that computing circuit is obtained from sampling element R after divider (1 grade or 2 grades) is divided by frequency, removes control chart 4, its direction should make carrier amplitude reduce; So, if remove control chart 5, its direction should make sinusoidal wave amplitude increase; As go control chart 6, its direction that the frequency and the amplitude of the frequency conversion of frequency conversion instruction life are all raise.
Fig. 4 and Fig. 5 scheme all do not change the output frequency (sine wave freuqency) of frequency converter, but increased the frequency converter output amplitude, the scheme of Fig. 6 is that frequency converter output frequency and amplitude are all improved, and these three kinds of schemes all can be actual practical, is corresponding different needs and gone to select by the designer.
Frequency converter improves voltage amplitude and improves frequency from can increasing rotating speed of motor in essence, but improves voltage amplitude only in the limited range below synchronizing speed, improves frequency then can be come the small electromotor rotating speed in wideer scope decline.Everything all has duality, and this compensation can not be excessive, excessive rotating speed will make motor speed surpass the original low load of motor the time, and this is unallowed in General System.
As follows for above important circuit more detailed description:
The current sampling signal of Fig. 7 is from Fig. 3, R obtains from sampling element, passes through operational amplifier A 1 addition with the rotary speed instruction signal, and the triangular wave of its result and triangular-wave generator at comparator A2 relatively, the square wave that output pulse width is variable is delivered to pulse-width modulator.
The computing circuit of Fig. 8 is the two-stage divider, can be in some occasion without the second level, the signal that obtains from sampling element is earlier through Resistor-Capacitor Unit filtering carrier wave with smoothly become signal a, b is divided by at divider with frequency signal, its as a result c deliver to second level divider, the divisor of second level division is not pure frequency signal b, but b '=b
(0～1), 0～1st, in the scope of selecting by the designer, when b '=1, can be considered second level divider and do not exist, remove terribly when b '=b can be considered second level divider, promptly compensation is very serious during low frequency, generally wishes to get a less median.At last operation result being delivered to corresponding adjustment circuit goes.
Fig. 9 utilizes operational amplifier and resistance change element, three-phase sine-wave is carried out the method that amplitude is adjusted, wherein resistance change element can be multiple mode, as field effect transistor, photo resistance, active equiva lent impedance or the like, the result who obtains with computing circuit removes to change simultaneously the feedback resistance (resistance change element) of three operational amplifiers, the three-phase sine-wave that the output of operational amplifier has just obtained adjusting is delivered to PWM then and is formed circuit.
The physical circuit of quasi-superconductor speed stabilizing system should be noted following problem in implementing:
1. load current increases and the increase of bucking voltage (or frequency) can not be excessive, and too much compensation causes system's instability.And in same system, because of the motor change needs to adjust feedback quantity.
2. current signal is influenced by other factors.For example be subjected to mains fluctuations, variations in temperature or the like need be made Corresponding Countermeasures during circuit design.
3. the sampling element of current signal (R) can be a resistance, also can be the current sensor of any way, as long as this current sensor can reflect the variation and the amplitude of electric current on the sampling point linearly.
Claims (9)
1, a kind of quasi-superconductor speed stabilizing system, this system applies is in direct current machine speed stabilizing loop, it is characterized in that the armature of a motor is arranged, the diode (D) and the inductance (L) of the sampling element of armature supply (R), signal processing circuit (A), pulse width modulation circuit (B) and the continuous usefulness of electric current; (+) end of one termination DC power supply U1 of sampling element (R) and (2) end of signal processing circuit (A), (1) end of another termination signal processing circuit (A) of sampling element (R) and the input of pulse-width modulator (B), the signal termination frequency instruction of signal processing circuit (A), the modulated terminal of the output termination pulse-width modulator (B) of circuit (A), the negative pole of the output terminating diode (D) of pulse-width modulator (B) and inductance (L), (+) end of another termination armature of inductance (L), (-) end of the positive pole of (-) the end diode (D) of armature and DC power supply U1; The current signal that sampling element (R) is obtained together with the foreign frequency instruction together, through signal processing circuit (A), removes control impuls width modulator (B).The direction of its effect is, when the voltage drop on the sampling element (R) increases, makes the pulse widening of pulse-width modulator (B) output, obtains higher voltage on the motor thereby make, and the motor resistance loss that the compensating load increase causes increases and the rotating speed that causes descends.
2, a kind of quasi-superconductor speed stabilizing system, this system applies the system is characterized in that in the Frequency Converter Control alternating current machine speed stabilizing loop with intermediate dc loop: system has a three phase alternating current motor, one to place current sampling element (R), a computing circuit (E), a carrier signal generator/amplitude adjusting circuit (F), a three-phase sine-wave generation/frequency regulating circuit (H), a sinusoidal wave amplitude adjusting circuit (K), a PWM of frequency converter DC loop to form a circuit (T) and a drive circuit (N); Three phase alternating current motor connects the output of frequency converter inverter circuit, two inputs of computing circuit (E) access the two ends of sample element R, the output of computing circuit (E) is carried wave generator/amplitude adjusting circuit (F), circuit (F) output termination PWM forms circuit (T), the input termination frequency command signal of three-phase sine-wave generation/frequency regulating circuit (H), its output (1) connects computing circuit (E), output (2) connects sinusoidal wave amplitude adjusting circuit (K), the output termination PWM of circuit (K) forms circuit (T), the output termination drive circuit (N) of circuit (T), circuit (N) output termination frequency converter inverter circuit; The current signal of the sign motor active power that obtains from sampling element (R) and the frequency signal of frequency converter carry out computing computing circuit (E), operation result removes to regulate the frequency converter internal circuit, finally make the frequency converter sinusoidal wave PWM form circuit and change output parameter, and then the driving inverter circuit, change the voltage magnitude of supplying with motor or change voltage magnitude and frequency simultaneously.Its action direction is that the motor load increase causes when frequency converter DC loop active current increases that the voltage increase of inverter output or voltage and frequency increase simultaneously, has compensated the rotating speed decline that the loss of motor self-resistance causes.
3, quasi-superconductor speed stabilizing system according to claim 1 is characterized in that: sampling element (R), pulse-width modulator (B) can be arranged on the positive and negative any side of DC power supply, as long as connect with the armature major loop; Inductance (L), diode (D) also can be arranged on the positive and negative any side of armature, as long as connect with armature, guarantee that armature supply can be continuously.
4, quasi-superconductor speed stabilizing system according to claim 2 is characterized in that: be to obtain the active current of sign electrical consumption as sample intelligence from the direct current major loop of frequency converter.
5, quasi-superconductor speed stabilizing system according to claim 2, it is characterized in that: the essence of this computing circuit (E) is a divider, the current signal value that divider obtains sampling making sampling obtain the influence that the active current value is eliminated frequency divided by frequency, becomes easy thereby make to regulate.
6, quasi-superconductor speed stabilizing system according to claim 2 is characterized in that: sampling element (R) can be a resistance, also can be the current sensor of any way, as long as this current sensor can reflect the variation and the amplitude of electric current on the sampling point linearly.
7, quasi-superconductor speed stabilizing system according to claim 2, it is characterized in that: the output of described computing circuit (E), its operation result removes to regulate the frequency converter internal circuit, can be connected to the adjustment end of carrier signal generation/amplitude adjusting circuit (F), carrier amplitude is changed, when current signal on the sampling element increases, carrier amplitude is descended.
8, quasi-superconductor speed stabilizing system according to claim 2, it is characterized in that: the output of described computing circuit (E), its operation result removes to regulate the frequency converter internal circuit, also can be connected to the adjustment end of sinusoidal wave amplitude adjusting circuit (K), sinusoidal wave amplitude is changed, when current signal on the sampling element increases, sinusoidal wave amplitude is increased.
9, quasi-superconductor speed stabilizing system according to claim 2, it is characterized in that: the output of described computing circuit (E), its operation result removes to regulate the frequency converter internal circuit, also can be connected to the adjustment end of sinusoidal wave amplitude adjusting circuit (K) and the control end of three-phase sine-wave generation/frequency regulating circuit (H), when current signal on the sampling element increased, frequency also increased when sinusoidal wave amplitude was increased.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98124016A CN1059057C (en) | 1998-12-21 | 1998-12-21 | Quasi-superconductor speed stabilizing system |
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|---|---|---|---|
| CN98124016A CN1059057C (en) | 1998-12-21 | 1998-12-21 | Quasi-superconductor speed stabilizing system |
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| CN1059057C true CN1059057C (en) | 2000-11-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102893512A (en) * | 2010-06-15 | 2013-01-23 | 株式会社Ihi | Power-saving driving apparatus and power-saving driving method for apparatus with uniform load pattern |
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| US6825626B2 (en) * | 2002-01-24 | 2004-11-30 | Emerson Electric Co. | Current sensing methods and apparatus in an appliance |
| JP3972124B2 (en) * | 2002-07-10 | 2007-09-05 | 株式会社日立製作所 | Synchronous motor speed control device |
| JP2004282969A (en) * | 2003-03-19 | 2004-10-07 | Hitachi Ltd | Control apparatus and method for ac motor |
| CN1293700C (en) * | 2004-12-14 | 2007-01-03 | 张建华 | Direct measuring and controlling method with DC motor |
| JP5549864B2 (en) * | 2010-06-15 | 2014-07-16 | 株式会社Ｉｈｉ | Power saving drive apparatus and method for apparatus having the same load pattern |
| US8233294B2 (en) * | 2010-08-23 | 2012-07-31 | Ford Global Technologies, Llc | Method and system for controlling a power converter system connected to a DC-bus capacitor |
| CN105864073A (en) * | 2016-05-23 | 2016-08-17 | 深圳市悦享电器有限公司 | Energy saving and muting cross-flow fan |
| CN106602946A (en) * | 2016-12-30 | 2017-04-26 | 欣旺达电子股份有限公司 | Steady speed control circuit, steady speed control method for direct current motor and lawn mower |
| CN108075699B (en) * | 2017-12-29 | 2024-02-20 | 上海沪工焊接集团股份有限公司 | Motor control method and motor controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1106175A (en) * | 1993-09-07 | 1995-08-02 | 株式会社东芝 | Power conversion system |
| CN2285031Y (en) * | 1996-02-06 | 1998-06-24 | 荣及峰 | Chopper speed regulator for dc motor |
-
1998
- 1998-12-21 CN CN98124016A patent/CN1059057C/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1106175A (en) * | 1993-09-07 | 1995-08-02 | 株式会社东芝 | Power conversion system |
| CN2285031Y (en) * | 1996-02-06 | 1998-06-24 | 荣及峰 | Chopper speed regulator for dc motor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102893512A (en) * | 2010-06-15 | 2013-01-23 | 株式会社Ihi | Power-saving driving apparatus and power-saving driving method for apparatus with uniform load pattern |
| CN102893512B (en) * | 2010-06-15 | 2015-09-09 | 株式会社Ihi | There is electric power saving drive unit and the method for the device of identical load pattern |
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| CN1224272A (en) | 1999-07-28 |
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