CN103872854B - Asynchronous motor voltage transforming circuit - Google Patents
Asynchronous motor voltage transforming circuit Download PDFInfo
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- CN103872854B CN103872854B CN201410133873.XA CN201410133873A CN103872854B CN 103872854 B CN103872854 B CN 103872854B CN 201410133873 A CN201410133873 A CN 201410133873A CN 103872854 B CN103872854 B CN 103872854B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention relates to the field of motors, in particular to an asynchronous motor voltage transforming circuit. The asynchronous motor voltage transforming circuit comprises a first voltage transformer, a second voltage transformer, a capacitor bank and a single-chip microcomputer, wherein the capacitor bank comprises multiple capacitors and multiple switches, each capacitor is connected with a corresponding switch in series to form a capacitance series circuit, the multiple capacitance series circuits are connected in parallel to form the capacitor bank, a branch circuit L1, a branch circuit L2 and a branch circuit L3 of a three-phase asynchronous motor are in star connection or in corner connection, a primary side winding of the first voltage transformer is connected with a power supply in parallel, a secondary side winding of the first voltage transformer is electrically connected with the input end of the single-chip microcomputer, a primary side winding of the second voltage transformer is connected with any one of the branch circuit L1, the branch circuit L2 and the branch circuit L in parallel, the secondary side winding of the second voltage transformer is connected with the input end of the single-chip microcomputer, the capacitor bank is connected with any one of the branch circuit L2 and the branch circuit L in series, and the multiple switches are connected with the output end of the single-chip microcomputer. According to the asynchronous motor voltage transforming circuit, the working efficiency of a motor is improved.
Description
Technical field
The present invention relates to machine field, electromechanical in particular to asynchronous motor mutual induction of voltage circuit and asynchronous electric
Stream mutual inductance circuit.
Background technology
Threephase asynchronous be produce, live in a kind of commonly used motor, for driving various universal machines, such as
Compressor, water pump, disintegrating machine, stock-removing machine, Transport Machinery and other plant equipment.Threephase asynchronous is in single-phase operation
When, part winding is relied on to split and mutually produce rotating excitation field, causes efficiency to reduce, plus upper motor consumes in itself reactive power, makes electricity
Motivation work efficiency is reduced.
Common practice is to increase the fortune of constant capacitance on L2 the or L3 any bar branch roads on threephase asynchronous
Row electric capacity improves the work efficiency of motor come the torque during operation for improving motor.
But the limited extent of electric motor operation efficiency is improved by way of the operation electric capacity for increasing constant capacitance.
The content of the invention
It is an object of the invention to provide asynchronous motor mutual induction of voltage circuit and asynchronous motor Current Mutual Inductance circuit, with
Solve the problems, such as above-mentioned.
Asynchronous motor mutual induction of voltage circuit is provided in an embodiment of the present invention,
Including：First voltage transformer, second voltage transformer, capacitor bank and single-chip microcomputer, the capacitor bank includes
Multiple capacitors and multiple switch, each described capacitor switch described with connects to form capacitor seriesing circuit, Duo Gesuo
State the capacitor seriesing circuit formation in parallel capacitor bank；
L1, L2 and L3 branch road Y-connection of the threephase asynchronous or Angle connection；
The first side winding and power sources in parallel of the first voltage transformer, its secondary side winding is defeated with the single-chip microcomputer
Enter end electrical connection；
Any bar branch circuit parallel connection in the first side winding and L1 or L2 or L3 of the second voltage transformer, its secondary side
Winding is connected with the input of the single-chip microcomputer；
The capacitor bank is connected with any bar branch road in L2 or L3；
Multiple switches are connected with the outfan of the single-chip microcomputer.
Preferably, the single-chip microcomputer is arranged using binary-coded decimal mode.
Preferably, the capacitor bank includes 7 electric capacity.
Preferably, 7 electric capacity pressure voltages are 400VDC, and capacitance be respectively 0.5uf, 1uf, 2uf, 4uf, 8uf,
16uf、32uf。
Preferably, the switch is auxiliary reclay, and the switch includes contact and coil, the coil and the monolithic
The outfan electrical connection of machine, the capacitor and the contact series form capacitor seriesing circuit.
Preferably, the single-chip microcomputer is used for,
Switch on-off according to the enabled instruction of advance typing adjustment is multiple, the capacitance for making the capacitor bank changes
It is changed into start-up capacitance value, and keeps default starting time；
Switch on-off according to the adjustment of the operating instruction of advance typing is multiple, the capacitance for making the capacitor bank changes
It is changed into running capacitance, and keeps default run time.
Preferably, the operating instruction in the advance typing of the basis adjusts the capacitance of the capacitor, and keeps default
Run time after also include,
Reference voltage value detected by the comparison first voltage transformer is detected with the second voltage transformer
Whether the terminal voltage value for arriving is equal；
If it is not, then calculating, and the difference of reference voltage value and terminal voltage value is recorded, be designated as the first difference；
The capacitance of the capacitor is improved into default first according to default mode and changes numerical value；
After being spaced the default time, the difference of reference voltage value and terminal voltage value is calculated and recorded again, be designated as the second difference
Value；
Whether comparison first difference is more than second difference；
If so, then again the capacitance of the capacitor is improved into default second according to default mode and changes numerical value；
If it is not, the capacitance for then reducing the capacitor according to default mode reduces the default 3rd changes numerical value；
Or,
Whether the comparison reference voltage value is equal with the terminal voltage value；
If it is not, then calculating again, and the difference of reference voltage value and terminal voltage value is recorded, be designated as the 3rd difference；
The capacitance of the capacitor is reduced into the default 4th according to default mode and changes numerical value；
After being spaced the default time, the difference of reference voltage value and terminal voltage value is calculated and recorded again, be designated as the 4th difference
Value；
Whether comparison the 3rd difference is more than the 4th difference；
If so, then again the capacitance of the capacitor is reduced into the default 5th according to default mode and changes numerical value；
If it is not, the capacitance for then reducing the capacitor according to default mode improves the default 6th changes numerical value.
Preferably, also include：Electronic pressure controller,
The electronic pressure controller is series between L1, L2 and L3 and the power supply simultaneously.
Preferably, the running voltage of the electronic pressure controller is that 220V outputs are 10KW.
The embodiment of the present invention additionally provides asynchronous motor Current Mutual Inductance circuit, including：It is first current transformer, second electric
Current transformer, capacitor bank and single-chip microcomputer, the capacitor bank includes multiple capacitors and multiple switch, each described capacitor
Switch described with one connects to form capacitor seriesing circuit, and multiple capacitor seriesing circuits are in parallel to form the capacitor bank；
L1, L2 and L3 branch road Y-connection of the asynchronous motor or Angle connection；
The first side winding and power sources in series of first current transformer, its secondary side winding is defeated with the single-chip microcomputer
Enter end electrical connection；
The first side winding of second current transformer is connected with L2 branch roads, its secondary side winding and the single-chip microcomputer
Input is electrically connected；
The capacitor bank is connected with any bar branch road in L2 or L3；
Multiple switches are connected with the outfan of the single-chip microcomputer.
Threephase asynchronous mutual induction of voltage control circuit provided in an embodiment of the present invention, with of the prior art in tradition
Increase the operation electric capacity of constant capacitance on L2 or L3 any bar branch roads on threephase asynchronous to improve the operation of motor
When torque, and then improve the method for work efficiency of motor and compare, it passes through two transformers and detects that access is electronic respectively
The supply voltage of machine and the voltage of motor L1 or L2 or L3 any bar branch road, appoint further according to two magnitude of voltage adjustment with L2 or L3
The capacitance of one branch road series connection, and then make capacitor bank and that branch road generation parallel connection for connect with capacitor bank humorous
Shake, make motor in the case where power consumption is minimum, output is constant, improve electric motor operation efficiency.
Description of the drawings
Fig. 1 shows the asynchronous motor mutual induction of voltage circuit winding basic block diagram of the embodiment of the present invention；
Fig. 2 shows the asynchronous motor mutual induction of voltage circuit single-chip microcomputer basic block diagram of the embodiment of the present invention；
Fig. 3 shows the asynchronous motor mutual induction of voltage circuit winding overall structure figure of the embodiment of the present invention；
Fig. 4 shows the asynchronous motor mutual induction of voltage circuit single-chip microcomputer overall structure figure of the embodiment of the present invention.
In figure：101st, capacitor；102nd, switch；103rd, the first side winding of first voltage transformer；104th, second voltage
The first side winding of transformer；105th, the secondary side winding of first voltage transformer；106th, the secondary side of second voltage transformer
Winding；107th, single-chip microcomputer；108th, electronic pressure controller；109th, coil；110th, contact.
Specific embodiment
Below by specific embodiment and combine accompanying drawing the present invention is described in further detail.
The embodiment of the present invention 1 provides the basic structure of asynchronous motor mutual induction of voltage circuit, as shown in figure 1, including：The
One voltage transformer, second voltage transformer, capacitor bank and single-chip microcomputer, the capacitor bank includes multiple capacitors and multiple
Switch, each described capacitor switch described with connects to form capacitor seriesing circuit, and multiple capacitor seriesing circuits are simultaneously
Connection forms the capacitor bank；L1, L2 and L3 branch road Y-connection of the threephase asynchronous or Angle connection；Described
The first side winding and power sources in parallel of one voltage transformer, its secondary side winding is electrically connected with the input of the single-chip microcomputer；Institute
State any bar branch circuit parallel connection in the first side winding of second voltage transformer and L1 or L2 or L3, its secondary side winding with it is described
The input connection of single-chip microcomputer；The capacitor bank is connected with any bar branch road in L2 or L3；It is multiple it is described switch with it is described
The outfan connection of single-chip microcomputer.
Wherein, asynchronous motor mutual induction of voltage circuit can be understood as threephase asynchronous mutual induction of voltage control circuit,
The first side winding 103 of first voltage transformer is used to measure the wire-end voltage value of Access Control circuit, that is, supply voltage.
The first side winding 104 of second voltage transformer is used for the wire-end voltage value of any bar branch road for measuring L1 or L2 or L3, due to
L1, L2 and L3 are connected modes in parallel two-by-two, so the magnitude of voltage of each branch road is equal, that is, which measure
The terminal voltage value of the coil in bar branch road is all identical value, when there is series resonance with the capacitance group connected in coil, electric capacity
The terminal voltage of group is 1.66667 times of the terminal voltage of coil, and the terminal voltage of 3 groups of coils is equal with supply voltage.Second voltage is mutual
The first side winding 104 of sensor and which bar branch circuit parallel connection are all possible.The secondary side winding 105 of first voltage transformer is used
It is used to be input into telecommunications to single-chip microcomputer 107 in the secondary side winding 106 to the input electrical signal of single-chip microcomputer 107, second voltage transformer
Number.Composed in parallel by multiple capacitors 101 with capacitor bank, the inverse of the capacitance of capacitor bank is each capacitor 101
Sum reciprocal, by the parallel connection of multiple capacitors 101, can increase the capacitance of capacitor bank, likewise, reducing capacitor
101 quantity in parallel can reduce the capacitance of capacitor bank.Increase herein and reduce the capacitance of capacitor bank
Mode is：Each capacitor 101 is connected with a switch 102, and 102 are controlled and switched by the break-make of controlling switch 102
The break-make of the place circuit of capacitor 101 of series connection, and then control whether single capacitor 101 increases or reduce capacitor bank
Capacitance.Namely switch 102 is then to increase the capacitance of capacitor bank by being disconnected to closure, and switch 102 is by being closed into disconnection
It is then the capacitance for reducing capacitor bank.
Single-chip microcomputer 107 is used for secondary according to the reference voltage value and second voltage transformer of first voltage transformer secondary side
The wire-end voltage value control break-make of multiple switch 102 of side.Wherein, the primary side number of turn of first voltage transformer and the secondary side number of turn
Identical is preferably than the primary side number of turn with second voltage transformer and secondary side turn ratio, then single-chip microcomputer 107 is received
Magnitude of voltage i.e. identical, can directly use.The break-make situation of each switch 102 in by controlling multiple switch 102,
Further single-chip microcomputer 107 is set to control the capacitance of capacitor bank by the control method of confession mentioned above.Its breaker in middle 102 can be with
It is relay, what is be connected with the outfan of single-chip microcomputer 107 is the coil of relay, into series circuit is relay with capacitance group
Contact, when coil is obtained it is electric when, contact path, so make with the contact series circuit connect.Certainly, single-chip microcomputer 107 is controlled
It also can be to instruct to complete according to advance typing single-chip microcomputer 107 to make each 102 break-make of switch.When motor normally runs
When, by the capacitance for adjusting capacitor bank, make the impedance of capacitance group and the impedance of the coil of a certain branch road equal, now
The magnitude of voltage for accessing the voltage source of circuit is equal with the magnitude of voltage of arbitrary branch road, and then capacitor bank is produced with another branch road
Parallel resonance, that is, L3 branch roads；What the parallel circuit after L2 branch roads and L3 branch circuit parallel connections was connected again with L1 branch roads, meanwhile, electricity
Container group produces series resonance with the coil on this branch road, and now the power factor of motor is 1, that is, is consuming electric energy
Make the output of motor constant in the case of minimum, and then improve the work efficiency of motor.
Detect that the supply voltage and motor L1 or L2 or L3 that access motor are arbitrary respectively by two voltage transformers
The voltage of bar branch road, further according to the capacitance that two magnitude of voltage adjustment are connected with L2 or L3 any bar branch roads, and then makes capacitor
Group produces parallel resonance with another branch road, and another branch road refers to the branch road do not connected with capacitor bank, in output
In the case of constant, the electricity of input is reduced, improve electric motor operation efficiency.
The embodiment of the present invention 2 provides threephase asynchronous mutual induction of voltage control circuit overall structure, such as Fig. 3 and Fig. 4
Shown, on the basis of embodiment 1, single-chip microcomputer 107 is arranged using binary-coded decimal mode, and using the coded system coding can be simplified
Process, coding is easy, and Simultaneous Switching usage quantity is minimum, reduces cost.Certainly, single-chip microcomputer 107 can also be using other volumes
Code mode, but realize that the difficulty for controlling is higher using other coded systems, the components and parts for using are also more.
Capacitor bank includes 7 capacitors 101.Namely include 7 in capacitor bank to be opened by an electric capacity and one
Close the series circuit of composition.As a result of binary-coded decimal coded system, it is that comparison is rational to arrange 7 outputs, can simplify list
The coding difficulty of piece machine 107, while one capacitor 101 of an on-off control, that is, include 7 capacitors 101.
7 electric capacity pressure voltages are 400VDC, and capacitance is respectively 0.5uf, 1uf, 2uf, 4uf, 8uf, 16uf, 32uf.
The motor supply voltage of resonance is lower than normal 220V or 380V, and numerical value is specially 120V, the setting mesh of this kind of magnitude of voltage
Be that voltage raises easy motor damage after series resonance, so the motor supply voltage of resonance will be reduced, through a large amount of real
After testing and calculating, it is determined that disclosure satisfy that the data of most of motor when the capacitance of 7 capacitors 101 is above-mentioned 7 values
Require, make capacitor bank produce parallel resonance with another branch road, wherein another branch road refers to not connect with capacitor bank
Branch road.When needing to adjust the capacitance of capacitor bank, the capacitance if necessary to adjust is 5uf, then I needs electric capacity
It is worth the electric capacity work for 1uf and 4uf, other electric capacity do not work, that is, the series circuit that 1uf and 4uf electric capacity is located is in logical
Road.Meanwhile, in order to ensure that electric capacity can be used normally, also there is certain requirement to the pressure voltage of electric capacity, i.e. electric capacity pressure voltage is
400VDC。
Equally, in order that voltage transformer can normal work, even if current value has certain floating also not interfere with voltage
The operating current of the work of transformer, first voltage transformer and second voltage transformer is 25mA-50mA.
Access start-up capacitance is needed to carry out split-phase when single-phase motor normal work, it is therefore an objective in making two windings
Electric current produces the phase contrast for being bordering on 90 °, to produce rotating excitation field, and then motor is rotated.Single-chip microcomputer 107 is used for, root
The break-make of multiple switch 102 is adjusted according to the enabled instruction of advance typing, the capacitance for making capacitor bank changes into start-up capacitance value,
And keep default starting time；The break-make of multiple switch 102 is adjusted according to the operating instruction of advance typing, capacitor bank is made
Capacitance changes into operation capacitance, and keeps default run time.Wherein, the enabled instruction of advance typing makes single-chip microcomputer
107 adjust the capacitance of capacitor bank by the break-make of controlling switch 102, make motor produce rotating excitation field, and then rotate
Get up, drawn by many experiments, the length of starting time should be 4 seconds or so.After reaching between on startup, capacitor bank is needed
Switch to the state of operation electric capacity, that is, traditional scheme to improve the start-up capacitance of electric motor operation efficiency, change capacitance
Mode with change start-up capacitance capacitance mode it is identical, by the capacitance of capacitor bank change into operation capacitance after energy
The work efficiency of motor is enough significantly improved, because the start-up capacitance of different motor is different, can be started in measurement
After electric capacity, the capacitance is entered in single-chip microcomputer 107, single-chip microcomputer 107 adjusts switch 102 in the instruction according to advance typing
Break-make situation.And then make different single-chip microcomputers 107 can reach higher work efficiency.
After motor starts normal operation, need to enter motor by adjusting the capacitance of capacitor bank
Resonant condition, its adjustment process is as follows, in the capacitance according to the operating instruction of advance typing adjustment capacitor 101, and keeps
Also include after default run time, compare the reference voltage value detected by first voltage transformer and second voltage mutual inductance
Whether the terminal voltage value detected by device is equal；If it is not, then calculating, and the difference of reference voltage value and terminal voltage value is recorded, remembered
For the first difference；The capacitance of capacitor 101 is improved into default first according to default mode and changes numerical value；Interval is default
After time, the difference of reference voltage value and terminal voltage value is calculated and recorded again, be designated as the second difference；Comparing the first difference is
It is no to be more than the second difference；If so, then again the capacitance of capacitor 101 is improved into default second according to default mode to change
Numerical value；If it is not, the capacitance for then reducing capacitor 101 according to default mode reduces the default 3rd changes numerical value.
Detect supply voltage and a certain bar branch road voltage it is equal when, by above, now motor enters in parallel humorous
The state shaken, power factor now is 1, work efficiency highest, but with the load entrained by motor change when, meeting
Cause that the impedance of capacitance group and the impedance of the coil of branch road are unequal, now motor can exit resonant condition, now also just need
Adjusting the capacitance of capacitor bank makes motor be again introduced into resonant condition, to improve the work efficiency of motor.Work as detection
When two magnitudes of voltage that go out are unequal, that is, motor has exited resonant condition, at this moment overcompensation and under-compensated state.Now
Need first to calculate and record the first difference, then need first to increase capacitance, and calculate again and record after capacitance is increased
Second difference, and compare the size of the first difference and the second difference, if the second difference is bigger than the first difference, just explanation passes through
Increase the mode of capacitance size, frequency of vibration when making motor calculate the second difference compares calculating apart from the distance of resonance point
Frequency of vibration during the first difference is bigger apart from the distance of resonance point, should reduce the capacitance of capacitor 101, makes motor
Frequency of vibration is closer to resonance point；Contrary, if the second difference is less than the first difference, just explanation is by increasing capacitance size
Mode, make motor calculate the second difference when frequency of vibration apart from the distance of resonance point compare calculate the first difference when shaking
Dynamic frequency is less apart from the distance of resonance point, that is, the mode that increase capacitance is adjusted is correct, should be increased again
Plus capacitance, the frequency of vibration of motor is made closer to resonance point.Through multiple above-mentioned adjustment motor can both located again
In resonant condition.
Certainly, when two magnitudes of voltage for detecting are unequal, it is also possible to first the capacitance of capacitor bank is reduced into certain
Numerical value, concrete adjustment mode is as follows, compares reference voltage value and second voltage transformer detected by first voltage transformer
Whether detected terminal voltage value is equal；If it is not, then calculating again, and the difference of reference voltage value and terminal voltage value is recorded,
It is designated as the 3rd difference；The capacitance of capacitor 101 is reduced into the default 4th according to default mode and changes numerical value；Interval is default
Time after, calculate again and record the difference of reference voltage value and terminal voltage value, be designated as the 4th difference；Relatively the 3rd difference
Whether the 4th difference is more than；If so, then again the capacitance of capacitor 101 is reduced into the default 5th according to default mode to change
Variable value；If it is not, the capacitance for then reducing capacitor 101 according to default mode improves the default 6th changes numerical value.
When two magnitudes of voltage for detecting are unequal, that is, motor has exited resonant condition, at this moment overcompensation and owe
The state of compensation.Now need first to calculate and record the 3rd difference, then need first to increase capacitance, and after capacitance is increased
Calculate again and the 4th difference of record, and compare the size of the 3rd difference and the 4th difference, if the 4th difference is poorer than the 3rd
It is worth greatly, by way of just explanation is increasing capacitance size, makes frequency of vibration during motor four difference of calculating apart from resonance
The frequency of vibration that the distance of point is compared when calculating three differences is bigger apart from the distance of resonance point, should reduce capacitor 101
Capacitance, makes the frequency of vibration of motor closer to resonance point；Contrary, if the 4th difference is less than the 3rd difference, just explanation
By way of increasing capacitance size, frequency of vibration when making motor calculate four differences is compared apart from the distance of resonance point
Frequency of vibration when calculating three differences is less apart from the distance of resonance point, that is, increases the mode that capacitance is adjusted
It is correct, should again increases capacitance, makes the frequency of vibration of motor closer to resonance point.Through multiple above-mentioned adjustment
So that motor is again at resonant condition.
Specifically, for reduces cost, preferably use relay to control the break-make of electric capacity place circuit, switch as centre
Relay, switch includes contact 110 and coil 109, and coil 109 is electrically connected with the outfan of single-chip microcomputer, capacitor 101 and one
The series connection of contact 110 forms capacitor seriesing circuit.
Switch can be relay, and what is be connected with the outfan of single-chip microcomputer 107 is the coil 109 of relay, with capacitance group
Into series circuit be relay contact 110, when coil 109 it is electric when, the path of contact 110, and then make with the contact 110
Series circuit connect.
In order that motor is more convenient for using, electronic pressure controller 108 is also included in this circuit, electronic pressure controller 108 is simultaneously
It is series between the star-connected circuit or Angle connection circuit and power supply that L1, L2 and L3 constituted.Adjusted by using electronics
Depressor 108 can directly adjust the input voltage of the control circuit, and the effect for adding electronic pressure controller is in order that in resonance
The motor of working condition is safer, and motor keeps rated voltage work, and the terminal voltage of capacitor is higher than electricity during series resonance
Source voltage, if not reducing voltage, motor will soon be burned out.
Preferably, the running voltage of electronic pressure controller 108 is that 220V outputs are 10KW, this kind of through a large amount of tests
The electronic pressure controller 108 of specification is more suitable for common household electric, the requirement of 220V power supplys.
The embodiment of the present invention 3 provides asynchronous motor Current Mutual Inductance circuit, including：It is first current transformer, second electric
Current transformer, capacitor bank and single-chip microcomputer, capacitor bank includes multiple capacitors and multiple switch, and each capacitor is opened with one
Close series connection and form capacitor seriesing circuit, multiple capacitor seriesing circuits are in parallel to form capacitor bank；L1, L2 of threephase asynchronous
With the Y-connection of L3 branch roads or Angle connection；The first side winding and power sources in series of the first current transformer, its secondary side winding
Electrically connect with the input of single-chip microcomputer；The first side winding of the second current transformer is connected with L2 branch roads, its secondary side winding with
The input electrical connection of single-chip microcomputer；Multiple switch is connected with the outfan of single-chip microcomputer.
Wherein, asynchronous motor Current Mutual Inductance circuit can be understood as three asynchronous motor Current Mutual Inductance control circuits.
The first side winding of the first current transformer is used to measure the terminal current value of Access Control circuit, that is, source current.The
The first side winding of two current transformers is used to measuring the terminal current value of L2 branch roads, and capacitor bank is by multiple capacitors and joint group
Into the inverse of the capacitance of capacitor bank is the sum reciprocal of each capacitor, by the parallel connection of multiple capacitors, can be increased
The capacitance of capacitor bank, likewise, the quantity in parallel for reducing capacitor can reduce the capacitance of capacitor bank.Herein
Increase and reduce the mode of capacitance of capacitor bank and be：Each capacitor is connected with a switch, is opened by control
Whether the break-make of pass increases the break-make of capacitor place circuit that controls connect with switch, and then the single capacitor of control
Or the capacitance of reduction capacitor bank.Namely switch and be then to increase the capacitance of capacitor bank by being disconnected to closure, switch by
It is then the capacitance for reducing capacitor bank to be closed into disconnection.
Single-chip microcomputer is used for the reference current value according to the first Current Transformer Secondary side and the second Current Transformer Secondary side
Terminal current value control multiple switch break-make.Wherein, the primary side number of turn of the first current transformer and secondary side turn ratio and
The primary side number of turn of the second current transformer is preferably identical with secondary side turn ratio, then the current value that single-chip microcomputer is received
Namely identical, can directly use.Parallel resonance internal circuit electric current is more than being externally supplied electric current, place's reason journey of current value
Sequence is controlled, and such as foreign current 1A, internal current 2A, single-chip microcomputer is received after the signal of current value, by the program in single-chip microcomputer
Carry out multiplying power conversion.Each switches on-off situation in by controlling multiple switch, by the control method of confession mentioned above
And then enable single-chip microcomputer to control the capacitance of capacitor bank.Certainly, each switch on and off of Single-chip Controlling also can be basis
The advance instruction of typing single-chip microcomputer is completing.Its breaker in middle can be relay, and what is be connected with single-chip microcomputer output is relay
The coiler part of device, with capacitance group into series circuit be relay contact, when coil is closed, contact path, and then make
Series circuit with the contact is connected.When motor normally runs, by the capacitance for adjusting capacitor bank, electricity is made
The impedance of appearance group and the impedance of the coil of L3 branch roads are equal, now access the prearranged multiple and string of the current value of the current source of circuit
The current value for having joined the branch road of electric capacity is equal, and then makes capacitor bank and another branch road produce parallel resonance, that is, with electricity
There is series resonance in the loop of appearance group series connection, electric capacity is connected with L2, then L2 is exactly series resonance, and L3 is parallel resonance, strictly
Say, L1 has also originated in series resonance.Herein the prearranged multiple of indication can be circuit during resonance according to motor driven voltage
What the relevant parameters such as equivalent resistance were calculated in advance, another branch road refers to the branch road do not connected with capacitor bank, meanwhile, electric capacity
Device group produces series resonance with the coil on this branch road, and now the power factor of motor is 1, that is, is consuming electric energy most
Make the output of motor constant in the case of few, and then improve the work efficiency of motor.
Detect that the source current and motor L2 or L3 any bar that access motor access electricity respectively by two transformers
The electric current of the branch road of appearance group, further according to the capacitance that two current value adjustment are connected with L2 or L3 any bar branch roads, and then makes electricity
Container group produces parallel resonance with another branch road, and another branch road refers to the branch road do not connected with capacitor bank, in output
In the case that power is constant, the electricity of input is reduced, improve electric motor operation efficiency.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (7)
1. asynchronous motor mutual induction of voltage circuit, it is characterised in that include：First voltage transformer, second voltage transformer, electricity
Container group and single-chip microcomputer, the capacitor bank includes multiple capacitors and multiple switch, described in each described capacitor and one
Switch series connection forms capacitor seriesing circuit, and multiple capacitor seriesing circuits are in parallel to form the capacitor bank；
L1, L2 and L3 branch road Y-connection of the asynchronous motor or Angle connection；
The first side winding and power sources in parallel of the first voltage transformer, the input of its secondary side winding and the single-chip microcomputer
Electrical connection；
Any bar branch circuit parallel connection in the first side winding and L1 or L2 or L3 of the second voltage transformer, its secondary side winding
It is connected with the input of the single-chip microcomputer；
The capacitor bank is connected with any bar branch road in L2 or L3；
Multiple switches are connected with the outfan of the single-chip microcomputer；
When the magnitude of voltage adjustment detected according to the first voltage transformer and the second voltage transformer is appointed with L2 or L3
During the capacitance of one branch road series connection, capacitor bank and the branch road generation parallel resonance do not connected with capacitor bank can be made；
The single-chip microcomputer is used for,
Switch on-off according to the enabled instruction of advance typing adjustment is multiple, the capacitance for making the capacitor bank is changed into
Start-up capacitance value, and keep default starting time；
Switch on-off according to the adjustment of the operating instruction of advance typing is multiple, the capacitance for making the capacitor bank is changed into
Operation capacitance, and keep default run time；
Adjust the capacitance of the capacitor in the operating instruction of the advance typing of the basis, and keep default run time it
Also include afterwards,
Reference voltage value detected by the comparison first voltage transformer with detected by the second voltage transformer
Whether terminal voltage value is equal；
If it is not, then calculating, and the difference of reference voltage value and terminal voltage value is recorded, be designated as the first difference；
The capacitance of the capacitor is improved into default first according to default mode and changes numerical value；
After being spaced the default time, the difference of reference voltage value and terminal voltage value is calculated and recorded again, be designated as the second difference；
Whether comparison first difference is more than second difference；
If so, then again the capacitance of the capacitor is improved into default second according to default mode and changes numerical value；
If it is not, the capacitance for then reducing the capacitor according to default mode reduces the default 3rd changes numerical value；
Or,
Whether the comparison reference voltage value is equal with the terminal voltage value；
If it is not, then calculating again, and the difference of reference voltage value and terminal voltage value is recorded, be designated as the 3rd difference；
The capacitance of the capacitor is reduced into the default 4th according to default mode and changes numerical value；
After being spaced the default time, the difference of reference voltage value and terminal voltage value is calculated and recorded again, be designated as the 4th difference；
Whether comparison the 3rd difference is more than the 4th difference；
If so, then again the capacitance of the capacitor is reduced into the default 5th according to default mode and changes numerical value；
If it is not, the capacitance for then reducing the capacitor according to default mode improves the default 6th changes numerical value.
2. asynchronous motor mutual induction of voltage circuit according to claim 1, it is characterised in that the single-chip microcomputer adopts BCD
Code mode is arranged.
3. asynchronous motor mutual induction of voltage circuit according to claim 2, it is characterised in that the capacitor bank includes 7
Individual electric capacity.
4. asynchronous motor mutual induction of voltage circuit according to claim 3, it is characterised in that 7 electric capacity pressure voltages
For 400VDC, and capacitance is respectively 0.5uf, 1uf, 2uf, 4uf, 8uf, 16uf, 32uf.
5. asynchronous motor mutual induction of voltage circuit according to claim 1, it is characterised in that the switch is middle relay
Device, the switch includes contact and coil, and the coil is electrically connected with the outfan of the single-chip microcomputer, the capacitor and one
The contact series form capacitor seriesing circuit.
6. asynchronous motor mutual induction of voltage circuit according to claim 1, it is characterised in that also include：Electronic pressure controller,
The electronic pressure controller is series between L1, L2 and L3 and the power supply simultaneously.
7. asynchronous motor mutual induction of voltage circuit according to claim 6, it is characterised in that the work of the electronic pressure controller
It is 10KW to make voltage for 220V outputs.
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| CN201410133873.XA CN103872854B (en) | 2014-04-03 | 2014-04-03 | Asynchronous motor voltage transforming circuit |
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| CN103872854B true CN103872854B (en) | 2017-05-03 |
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| CN107026457A (en) * | 2016-02-02 | 2017-08-08 | 天津理工大学 | A kind of dynamic passive compensation energy-saving control system based on asynchronous motor |
| CN109889123B (en) * | 2019-03-12 | 2024-04-02 | 洛阳理工学院 | Control system and control method for improving power factor of wound-rotor asynchronous motor |
| CN113691191B (en) * | 2021-08-26 | 2023-05-30 | 中铁第四勘察设计院集团有限公司 | Device and method for reducing power supply voltage of long-stator synchronous linear motor stator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1060372A (en) * | 1991-08-14 | 1992-04-15 | 张金善 | Efficient energy-saving resonance-type ac motor |
| CN102005880A (en) * | 2010-11-16 | 2011-04-06 | 山东大学 | Three-winding parallel single-phase induction motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2471013Y (en) * | 2001-02-06 | 2002-01-09 | 李彩霞 | High start-torque single-phase capacity operation micro motor |
| GB2389250B (en) * | 2002-05-31 | 2005-12-21 | Bowman Power Systems Ltd | High-frequency generator |
| CN203911673U (en) * | 2014-04-03 | 2014-10-29 | 连长国 | Asynchronous motor voltage mutual inductance circuit and asynchronous motor current mutual inductance circuit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1060372A (en) * | 1991-08-14 | 1992-04-15 | 张金善 | Efficient energy-saving resonance-type ac motor |
| CN102005880A (en) * | 2010-11-16 | 2011-04-06 | 山东大学 | Three-winding parallel single-phase induction motor |
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Effective date of registration: 20181010 Address after: 230000 the 2 building of No. 19 Guan Tang Road, Luyang District, Hefei, Anhui, 3 East. Patentee after: Hefei Hemei Electronic Technology Co., Ltd. Address before: 116000 Mu Jia Tun 34, Mu Jia village, Hua Jia Tun Town, Jinzhou District, Dalian, Liaoning Patentee before: Lian Changguo |