CN106487315A - A kind of speed regulating method of alternating current generator - Google Patents
A kind of speed regulating method of alternating current generator Download PDFInfo
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- CN106487315A CN106487315A CN201610901968.0A CN201610901968A CN106487315A CN 106487315 A CN106487315 A CN 106487315A CN 201610901968 A CN201610901968 A CN 201610901968A CN 106487315 A CN106487315 A CN 106487315A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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Abstract
The invention discloses a kind of speed regulating method of alternating current generator, this speed regulating method includes：Step 1, obtains the original alternating current to alternating current generator to be entered；Step 2, convert original alternating current waveform, make alternating current incoming frequency be conversion before 1/N, the alternating current after being converted；Wherein, N is positive integer；Step 3, is powered for alternating current generator using the alternating current after waveform conversion, alternating current generator rotating speed is the 1/N of alternating current generator rotating speed in the case of original AC-powered.The present invention is a kind of method that many gear-types control alternating current generator rotating speed, this speed regulating method is reliable and stable, can be applicable to the product higher to alternating current generator torque requiremnt, as washing machine, refrigerator, air-conditioning etc., this speed regulating method corresponding control circuit cost of manufacture is cheap, therefore, the present invention has a wide range of applications scene.
Description
Technical field
The present invention relates to alternating current generator technical field, specifically for, the present invention relates to a kind of speed governing of alternating current generator
Method.
Background technology
Alternating current generator, in practical application, due to the restriction of product function or energy consumption standard, needs alternating current generator is entered
Row speed governing uses, and traditional speed regulating method mainly has following several.
First, mechanical governing method, this method is mainly by installing the machines such as speed change gear or soft drive bands additional
Tool frame mode is realized to speed regualtion of AC motor.But, this mode of speed regulation is higher to the required precision of frame for movement, Er Qiefa
Mechanical speed adjusting gear maintenance difficult during raw fault.
2nd, electronic type power control mode, including phase-shift voltage regulating control mode, PWM control mode, revolutional slip adjustment mode
Etc. scheme, but these modes are all to be controlled by changing the voltage of alternating current, electric current or alternating current generator itself revolutional slip
Speed, thus the disadvantage of this scheme is that speed ratio is very low, alternating current generator torsion declines with rotating speed and loses serious it is impossible to answer
Have high demands for speed governing, product that high torsion, torsion are continually changing, such as it is impossible to being applied to refrigerator, compressor of air conditioner, washing
The very high product of the alternating current generator torque requiremnt such as clothing machine.
3rd, electronic type VFC mode, concrete grammar is first original alternating current to be changed into unidirectional current, then direct current is changed
For frequency square wave variable at any time or sine wave AC waveform, i.e. this control process is AC-DC, direct current change exchange
Reversals.But, this mode requires the control circuit of complexity and the control device of costliness, leads to traditional AC motor to turn
The cost of fast VFC remains high；In addition, the reversals that AC-DC, direct current become exchange inevitably result from
Many electronic interferences ripples and substantial amounts of energy loss, lead to alternating current generator utilization rate of electrical low.
Therefore, the problems existing for traditional speed regualtion of AC motor mode, a kind of application scenario of acquisition is wide, control
The speed regulating method of the alternating current generator that method is simple, resource utilization is high, speed ratio is high becomes those skilled in the art and urgently solves
Technical problem certainly and the emphasis of research.
Content of the invention
For overcoming the defect of existing speed regualtion of AC motor technology presence, the invention discloses a kind of speed governing side of alternating current generator
Method, breaches the limitation of traditional AC motor mode of speed regulation, improves the utilization rate of electric energy, simplifies speed regulating method, improves
Speed ratio, and the speed regulating method of the present invention is simple, easily implement.
For realizing above-mentioned technical purpose, the invention discloses a kind of speed regulating method of alternating current generator, this speed regulating method includes：
Step 1, obtains the original alternating current to alternating current generator to be entered；
Step 2, convert described original alternating current waveform, make alternating current incoming frequency be conversion before 1/N, become
Alternating current after changing；Wherein, N is positive integer；
Step 3, is powered for described alternating current generator using the alternating current after waveform conversion, and described alternating current generator rotating speed is original
The 1/N of alternating current generator rotating speed in the case of AC-powered.
The present invention can make alternating current generator incoming frequency waveform change become the 1/N of original frequency, such as alternating current generator is inputted frequency
Rate waveform change becomes the relative characteristic frequency waveform such as 1/1,1/2,1/3,1/4 of original frequency, realizes a kind of many to alternating current generator
The speed-regulating scheme of gear speed controlling, using the alternating current generator of speed governing of the present invention have good torsion retentivity, have higher
Torsion, the present invention can improve speed ratio, improve power-efficient, reach the effect of saves energy, meet most speed governing
Demand；In addition, the corresponding control circuit of the present invention is reliable and stable, cost of manufacture is cheap.
Further, in step 2, by the waveform of way of full-wave rectification or alternating current described in halfwave rectifier mode conversion.
Process the waveform of original alternating current by way of all wave rectification, can relatively easily realize many gears and control alternating current generator to turn
Speed.
Further, in step 2, the waveform of described original alternating current is sine wave A, by the negative electricity repoussage in sine wave A
Flow for positive voltage, obtain waveform B；Sine wave A is obtained by on-off control waveform B：1st cycle of described waveform B passes through to open
Pass 1 and switch 4 are output into positive voltage, and the 2nd cycle of waveform B passes through switch 2 and be output into negative voltage with switch 3, above
For complete rate-determining steps, the 3rd cycle of waveform B starts to repeat above-mentioned rate-determining steps, the alternating current that sine wave A represents
Incoming frequency be the 1/1 of original alternating current incoming frequency；In step 3, the use of the alternating current with sine wave A is described exchange
Motor is powered, and described alternating current generator rotating speed is 1/1 of alternating current generator rotating speed in the case of original AC-powered.
Further, in step 2, the waveform of described original alternating current is sine wave A, by the negative electricity repoussage in sine wave A
Flow for positive voltage, obtain waveform B；Waveform C is obtained by on-off control waveform B, the incoming frequency of the alternating current that waveform C represents is
The 1/2 of original alternating current incoming frequency；In step 3, powered for described alternating current generator using the alternating current with waveform C, described
Alternating current generator rotating speed is 1/2 of alternating current generator rotating speed in the case of original AC-powered.
Further, in step 2, the 1st cycle of described waveform B passes through switch 1 and switch 4 is output into positive voltage,
Close the 2nd cycle of waveform B, the 3rd cycle of waveform B passes through switch 2 and switch 3 is output into negative voltage, closes waveform B
The 4th cycle, be more than complete rate-determining steps；5th cycle of waveform B starts to repeat above-mentioned rate-determining steps.
Further, in step 2, the waveform of described original alternating current is sine wave A, by the negative electricity repoussage in sine wave A
Flow for positive voltage, obtain waveform B；Waveform D is obtained by on-off control waveform B, the alternating current incoming frequency that waveform D represents is former
The 1/3 of beginning alternating current incoming frequency；In step 3, powered for described alternating current generator using the alternating current with waveform D, described friendship
Stream motor speed is 1/3 of alternating current generator rotating speed in the case of original AC-powered.
Further, in step 2, the 1st cycle of described waveform B passes through switch 1 and switch 4 is output into positive voltage,
2nd cycle of closing waveform B and the 3rd cycle, the 4th cycle of waveform B passes through switch 2 and switch 3 is output into negative electricity
Pressure, the 5th cycle of closing waveform B and the 6th cycle, are more than complete rate-determining steps；7th cycle of waveform B
Start to repeat above-mentioned rate-determining steps.
Further, in step 2, the waveform of described original alternating current is sine wave A, by the negative electricity repoussage in sine wave A
Flow for positive voltage, obtain waveform B；Waveform E is obtained by switch process waveform B, the alternating current incoming frequency that waveform E represents is former
The 1/4 of beginning alternating current incoming frequency；In step 3, powered for described alternating current generator using the alternating current with waveform E, described friendship
Stream motor speed is 1/4 of alternating current generator rotating speed in the case of original AC-powered.
Further, in step 2, a cycle of waveform B passes through switch 1 and switch 4 is output into positive voltage, closes
2nd cycle of waveform B, the 3rd cycle and the 4th cycle, the 5th cycle of waveform B passes through switch 2 and exports into switch 3
For negative voltage, close the 6th cycle, the 7th cycle and the 8th cycle, be more than complete rate-determining steps；Waveform B
9th cycle starts to repeat above-mentioned rate-determining steps.
Further, in step 2, convert original alternating current waveform, by the incoming frequency of alternating current be conversion before 1/1
Or 1/2 or 1/3 or 1/4；In step 3, make alternating current generator rotating speed in the case of original AC-powered alternating current generator rotating speed 1/
1st, mutually switch between 1/2,1/3,1/4.
Further, in step 2, the control mode using zero volt position carries out on-off control, makes the incoming frequency of alternating current
1/N for original alternating current incoming frequency.
Further, in step 2, by friendship original described in the mode conversion of external signal trigger control unit controlling switch
The waveform of stream electricity, makes the rotating speed of alternating current generator switch between different gears.
Further, in four switches, two of which switchs and inputs positive voltage for controlling to described alternating current generator, in addition
Two switch for controlling to described alternating current generator input negative voltage.
Further, switch as semiconductor switch, realize above-mentioned closing function and negative function.
Further, the waveform of described alternating current is converted by bridge rectifier.
Further, in step 2, by the waveform of alternating current described in halfwave rectifier mode conversion, make the input of alternating current
Frequency is the 1/N before conversion, the alternating current after being converted；Wherein, N is 2n, n is positive integer；Therefore, by halfwave rectifier
The frequency of the alternating current of input AC motor can be adjusted to 1/2,1/4,1/8 ... before conversion by mode.
Beneficial effects of the present invention are：The present invention is a kind of method that gear-type controls alternating current generator rotating speed, this speed governing side
Method is reliable and stable, can be applicable to the product higher to alternating current generator torque requiremnt, such as washing machine, refrigerator, air-conditioning etc., this speed governing side
Method corresponding control circuit cost of manufacture is cheap, and therefore, the present invention has a wide range of applications scene.
Brief description
Fig. 1 is waveform transition status figure in embodiment one.
Fig. 2 is waveform transition status figure in embodiment two.
Fig. 3 is waveform transition status figure in embodiment three.
Fig. 4 is waveform transition status figure in example IV.
Fig. 5 is the speed regulating method corresponding arrangements for speed regulation schematic diagram of alternating current generator of the present invention.
Fig. 6 is the waveform transition status figure in the case of halfwave rectifier in embodiment five.
In figure,
1st, sine wave A；2nd, waveform B；3rd, waveform C；4th, waveform D；5th, waveform E；6th, waveform F.
Specific embodiment
With reference to Figure of description, detailed explanation and explanation are carried out to the present invention.
Embodiment one：
As shown in Figure 1,5, the invention discloses a kind of speed regulating method of alternating current generator, this speed regulating method includes：
Step 1, obtains the original alternating current to alternating current generator to be entered, and in the present embodiment, original alternating current is civil power.
In step 2, the waveform of described original alternating current is sine wave A1, and the negative voltage rectification in sine wave A1 is positive electricity
Pressure, obtains waveform B；Sine wave A is obtained by on-off control waveform B：1st cycle of described waveform B passes through to switch 1 and switch
4 are output into positive voltage, the 2nd cycle of waveform B pass through to switch 2 and switch 3 be output into negative voltage, be more than one complete
Rate-determining steps, the 3rd cycle of waveform B start to repeat above-mentioned rate-determining steps, the incoming frequency of the alternating current that sine wave A represents
For original alternating current incoming frequency 1/1；In step 3, powered for described alternating current generator using the alternating current with sine wave A,
Alternating current generator rotating speed is 1/1 of alternating current generator rotating speed in the case of original AC-powered.
Step 3, is powered for described alternating current generator using the alternating current after waveform conversion, the waveform of input AC motor is still
For sine wave state, maintain the endurance quality of alternating current generator and the power-efficient of alternating current generator itself.
Embodiment two：
As shown in Fig. 2,5, the invention discloses a kind of speed regulating method of alternating current generator, this speed regulating method includes：
Step 1, obtains the original alternating current to alternating current generator to be entered, and in the present embodiment, original alternating current is civil power.
Step 2, converts the waveform of described original alternating current, by the ripple of alternating current described in the mode conversion of all wave rectification
Shape, specifically, can convert the waveform of described alternating current by bridge rectifier, before making the incoming frequency of alternating current be conversion
1/N, the alternating current after being converted；Wherein, N is positive integer, is 1,2,3 ....In the present embodiment, N elects 2 as.The present invention adopts
With rectifier system, no negative electricity flow phenomenon, therefore, such as survey according to the True rms measured value and Mean measured value of ANSI international standard
Regularly, PF value can reach 1 standard.
Specifically, in step 2, the waveform of described original alternating current is sine wave A1, by the negative voltage in sine wave A1
Rectification is positive voltage, obtains waveform B 2, then the once for every half of the original alternating current of precise control input, that is, to waveform B 2
Each ripple is controlled；Waveform C3 is obtained by on-off control waveform B 2, the 1st cycle of waveform B 2 passes through to switch 1 and switch 4
It is output into positive voltage, closes the 2nd cycle of waveform B 2, the 3rd cycle of waveform B 2 passes through switch 2 and export into switch 3
For negative voltage, close the 4th cycle of waveform B 2, be more than complete rate-determining steps；5th cycle of waveform B 2 starts
Repeat above-mentioned rate-determining steps.In the present embodiment, by former described in the mode conversion of external signal trigger control unit controlling switch
The waveform of beginning alternating current.
Step 3, is powered for described alternating current generator using the alternating current after waveform conversion, the waveform of input AC motor is still
For sine wave state, maintain the endurance quality of alternating current generator and the power-efficient of alternating current generator itself.In the present embodiment, use
The alternating current with waveform C3 is powered for described alternating current generator, and described alternating current generator rotating speed is friendship in the case of original AC-powered
The 1/2 of stream motor speed.The alternating current with above-mentioned waveform C3 is inputted to alternating current generator, when switch receives after four switches
After open signal, switch automatically opens up, provides alternating current for described alternating current generator, and the semiconductor switch that the present invention utilizes is controlling
Can switch exactly under the control of unit, realize above-mentioned waveform C3, the present invention is opened using zero volt position when controlling ac period
Pass technology, just can produce switching signal, thus avoids high voltage, heavy current when each ripple produces when zero volt changes
Impact to controller and alternating current generator, decreases harmonic wave and other electromagnetic interference, maintains the endurance quality of alternating current generator, with
When improve the power-efficient of control unit itself, can achieve economic, efficient speed regualtion of AC motor scheme.Described alternating current generator
Rotating speed is the 1/N of alternating current generator rotating speed in the case of original AC-powered.In the present embodiment, alternating current generator rotating speed is original exchange
The 1/2 of alternating current generator rotating speed under electric electric power thus supplied.In the present embodiment, in four switches, two of which switchs for controlling to institute
State alternating current generator input positive voltage, such as inputted positive voltage to alternating current generator with switch 4 by switching 1, two other switch is used
Input negative voltage in controlling to described alternating current generator, such as inputted negative voltage to alternating current generator, this reality with switch 3 by switching 2
Apply in example, above-mentioned switch 1,2,3,4 is semiconductor switch.
Embodiment three：
As shown in Fig. 3,5, the present embodiment is essentially identical with the speed regulating method of the alternating current generator of embodiment one, and its difference exists
In：
In step 2, the waveform of described original alternating current is sine wave A1, and the negative voltage rectification in sine wave A1 is positive electricity
Pressure, obtains waveform B 2, and then the once for every half of the original alternating current of precise control input, is carried out to each ripple of waveform B 2
Control；For waveform B 2, waveform D4 is obtained by switch process waveform B 2, the 1st cycle of waveform B 2 passes through to switch 1 and switch
4 are output into positive voltage, the 2nd cycle of closing waveform B 2 and the 3rd cycle, and the 4th cycle of waveform B 2 passes through to switch 2 Hes
Switch 3 is output into negative voltage, the 5th cycle of cut out waveform B 2 and the 6th cycle, is more than a complete control step
Suddenly；7th cycle of waveform B 2 starts to repeat above-mentioned rate-determining steps, and the alternating current incoming frequency that waveform D4 represents is original exchange
The 1/3 of electric incoming frequency.
In step 3, the alternating current with described waveform D4 is inputted to alternating current generator, when switch receives after four switches
After open signal, switch automatically opens up, provides alternating current for described alternating current generator, the use of the alternating current with waveform D4 is described
Alternating current generator is powered, and the semiconductor switch of utilization of the present invention can switch under the control of the control unit exactly, realizes above-mentioned
Waveform D4, described alternating current generator rotating speed is 1/3 of alternating current generator rotating speed in the case of original AC-powered.In the present embodiment, four
In individual switch, two of which switchs and inputs positive voltage for controlling to described alternating current generator, such as will just by switch 1 and switch 4
To alternating current generator, two other switchs and inputs negative voltage for controlling to described alternating current generator, such as by switching 2 Hes control source
Switch 3 inputs negative voltage to alternating current generator, and in the present embodiment, above-mentioned switch 1,2,3,4 is semiconductor switch.
Example IV：
As shown in Figure 4,5, the present embodiment is essentially identical with the speed regulating method of the alternating current generator of embodiment one, and its difference exists
In：In step 2, the waveform of described original alternating current is sine wave A1, the negative voltage rectification in sine wave A1 is positive voltage, obtains
To waveform B 2, then the once for every half of the original alternating current of precise control input, is controlled to each ripple of waveform B 2；
For waveform B 2, waveform E5 is obtained by switch process waveform B 2, a cycle of waveform B 2 passes through switch 1 and switch 4 is defeated
Go out and become positive voltage, close the 2nd cycle, the 3rd cycle and the 4th cycle of waveform B 2, the 5th cycle of waveform B 2 passes through
Switch 2 and switch 3 are output into negative voltage, close the 6th cycle, the 7th cycle and the 8th cycle, be more than one complete
Rate-determining steps；9th cycle of waveform B 2 starts to repeat above-mentioned rate-determining steps.The alternating current incoming frequency that waveform E5 represents is
The 1/4 of original alternating current incoming frequency.
In step 3, the alternating current with described waveform E5 is inputted to alternating current generator, when switch receives after four switches
After open signal, switch automatically opens up, provides alternating current for described alternating current generator, the use of the alternating current with waveform E5 is described
Alternating current generator is powered, and the semiconductor switch of utilization of the present invention can switch under the control of the control unit exactly, realizes above-mentioned
Waveform E5, described alternating current generator rotating speed is 1/4 of alternating current generator rotating speed in the case of original AC-powered.In the present embodiment, four
In individual switch, two of which switchs and inputs positive voltage for controlling to described alternating current generator, such as will just by switch 1 and switch 4
To alternating current generator, two other switchs and inputs negative voltage for controlling to described alternating current generator, such as by switching 2 Hes control source
Switch 3 inputs negative voltage to alternating current generator, and in the present embodiment, above-mentioned switch 1,2,3,4 is semiconductor switch.
It should be noted that the waveform of the convertible described original alternating current of the present invention, the incoming frequency of alternating current is to become
Before changing 1/1 or 1/2 or 1/3 or 1/4；In step 3, make alternating current generator rotating speed alternating current generator in the case of original AC-powered
Mutually switch between the 1/1 of rotating speed, 1/2,1/3,1/4.
Embodiment five：
The present embodiment is similar with the speed control principle of embodiment one, and its difference is：The present embodiment passes through halfwave rectifier
The waveform of alternating current described in mode conversion.
As shown in fig. 6, by halfwave rectifier mode by the waveform of original alternating current be sine wave A1 in negative voltage rectification,
Eliminate, obtain waveform F6, then the once for every half of the original alternating current of precise control input, enters to each ripple of waveform F6
Row control, make alternating current incoming frequency be conversion before 1/N, the alternating current after being converted；In the present embodiment, N is 2n, n
For positive integer；Therefore, by way of halfwave rectifier, the frequency of the alternating current of input AC motor can be adjusted to before conversion
1/2、1/4、1/8…….
It should be noted that above-described embodiment only give by alternating current generator incoming frequency be adjusted to original frequency 1/2,
1/3rd, 1/4, but, under the technology of the present invention is enlightened, alternating current generator incoming frequency can be adjusted to the 1/N of original frequency, than
As N=5, N=6 etc., realize alternating current generator multi gear bit rate is controlled.Although in addition, the frequency of input AC motor be through
Cross the 1/N frequency such as 1/2,1/3 of change, but, each half period that the waveform after frequency conversion still has original 50HZ frequency is special
Property, the alternating current generator because needing to control is the self induction mode alternating current generator based on 50HZ city electric standard in itself, therefore inputs electricity
Stream also can be close to original 1/2,1/3 etc., heavy current also will not occur for the impact of alternating current generator, and for exchange
The impact of the technical specifications such as the vibrations of motor, noise and durability is less.
In addition, the present invention adopts BTL loop, BTL is the abbreviation of Bridge-Tied-Load, i.e. bridge-tied load, at present
It is mainly used in tens volts with the output of interior power analog form, although the input power in this programme BTL loop is analog form, whole
Body Starting mode is digital manner.In the present invention, after generation waveform B to before input AC motor, only pass through switch process
Waveform opening and closing and reverse, the pilot process simply processing.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all substantive in the present invention
Any modification, equivalent and simple modifications of being made in content etc., should be included within the scope of the present invention.
Claims (9)
1. a kind of speed regulating method of alternating current generator is it is characterised in that this speed regulating method includes：
Step 1, obtains the original alternating current to alternating current generator to be entered；
Step 2, convert described original alternating current waveform, make alternating current incoming frequency be conversion before 1/N, after being converted
Alternating current；Wherein, N is positive integer；
Step 3, is powered for described alternating current generator using the alternating current after waveform conversion, and described alternating current generator rotating speed is original exchange
The 1/N of alternating current generator rotating speed under electric electric power thus supplied.
2. the speed regulating method of alternating current generator according to claim 1 is it is characterised in that in step 2, by all wave rectification side
Formula or the waveform of alternating current described in halfwave rectifier mode conversion.
3. the speed regulating method of alternating current generator according to claim 2 is it is characterised in that in step 2, described original alternating current
Waveform be sine wave A, by the negative voltage rectification in sine wave A be positive voltage, obtain waveform B；Obtained by on-off control waveform B
To sine wave A：1st cycle of described waveform B passes through switch 1 and switch 4 is output into positive voltage, the 2nd cycle of waveform B
It is output into negative voltage by switching 2 with switch 3, be more than complete rate-determining steps, the 3rd cycle of waveform B starts
Repeat above-mentioned rate-determining steps, the incoming frequency of the alternating current that sine wave A represents is the 1/1 of original alternating current incoming frequency；Step 3
In, powered for described alternating current generator using the alternating current with sine wave A, described alternating current generator rotating speed is original AC-powered
In the case of alternating current generator rotating speed 1/1.
4. the speed regulating method of alternating current generator according to claim 2 is it is characterised in that in step 2, described original alternating current
Waveform be sine wave A, by the negative voltage rectification in sine wave A be positive voltage, obtain waveform B；Obtained by on-off control waveform B
To waveform C：1st cycle of described waveform B passes through switch 1 and switch 4 is output into positive voltage, closes the 2nd week of waveform B
Phase, the 3rd cycle of waveform B passes through switch 2 and switch 3 is output into negative voltage, closes the 4th cycle of waveform B, is more than
One complete rate-determining steps；5th cycle of waveform B starts to repeat above-mentioned rate-determining steps；The alternating current that waveform C represents defeated
Enter that frequency is original alternating current incoming frequency 1/2；In step 3, the use of the alternating current with waveform C is that described alternating current generator supplies
Electricity, described alternating current generator rotating speed is 1/2 of alternating current generator rotating speed in the case of original AC-powered.
5. the speed regulating method of alternating current generator according to claim 2 is it is characterised in that in step 2, described original alternating current
Waveform be sine wave A, by the negative voltage rectification in sine wave A be positive voltage, obtain waveform B；Obtained by on-off control waveform B
To waveform D：1st cycle of described waveform B passes through switch 1 and switch 4 is output into positive voltage, closes the 2nd week of waveform B
Phase and the 3rd cycle, the 4th cycle of waveform B passes through switch 2 and switch 3 is output into negative voltage, close waveform B the 5th
Cycle and the 6th cycle, are more than complete rate-determining steps；7th cycle of waveform B starts to repeat above-mentioned control step
Suddenly, the alternating current incoming frequency that waveform D represents is the 1/3 of original alternating current incoming frequency；In step 3, using having waveform D's
Alternating current is powered for described alternating current generator, and described alternating current generator rotating speed is alternating current generator rotating speed in the case of original AC-powered
1/3.
6. the speed regulating method of alternating current generator according to claim 2 is it is characterised in that in step 2, described original alternating current
Waveform be sine wave A, by the negative voltage rectification in sine wave A be positive voltage, obtain waveform B；Obtained by switch process waveform B
To waveform E：The a cycle of described waveform B passes through switch 1 and switch 4 is output into positive voltage, close waveform B the 2nd
Cycle, the 3rd cycle and the 4th cycle, the 5th cycle of waveform B passes through switch 2 and switch 3 is output into negative voltage, closes
6th cycle, the 7th cycle and the 8th cycle, are more than complete rate-determining steps；9th cycle of waveform B starts
Repeat above-mentioned rate-determining steps, the alternating current incoming frequency that waveform E represents is the 1/4 of original alternating current incoming frequency；In step 3,
Powered for described alternating current generator using the alternating current with waveform E, described alternating current generator rotating speed is original AC-powered situation
The 1/4 of lower alternating current generator rotating speed.
7. the speed regulating method of alternating current generator according to claim 2 is it is characterised in that in step 2, convert described original friendship
Stream electricity waveform, by the incoming frequency of alternating current be conversion before 1/1 or 1/2 or 1/3 or 1/4；In step 3, make alternating current generator
Rotating speed in the case of original AC-powered alternating current generator rotating speed 1/1,1/2,1/3,1/4 between mutually switch.
8. the speed regulating method of the alternating current generator according to any claim in claim 3 to 7 is it is characterised in that step 2
In, the control mode using zero volt position carries out on-off control, and the incoming frequency making alternating current is original alternating current incoming frequency
1/N.
9. the speed regulating method of alternating current generator according to claim 8 is it is characterised in that in step 2, touched by external signal
Send out the waveform of the original alternating current described in mode conversion of control unit controlling switch, the rotating speed making alternating current generator is in different gears
Between switch.
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