CN102594161A - Two-phase variable frequency power source and output method thereof - Google Patents
Two-phase variable frequency power source and output method thereof Download PDFInfo
- Publication number
- CN102594161A CN102594161A CN2012100437480A CN201210043748A CN102594161A CN 102594161 A CN102594161 A CN 102594161A CN 2012100437480 A CN2012100437480 A CN 2012100437480A CN 201210043748 A CN201210043748 A CN 201210043748A CN 102594161 A CN102594161 A CN 102594161A
- Authority
- CN
- China
- Prior art keywords
- inverter circuit
- bridge inverter
- output
- variable frequency
- frequency power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Inverter Devices (AREA)
Abstract
The invention relates to a two-phase variable frequency power source and an output method of the two-phase variable frequency power source. The two-phase variable frequency power source comprises power supply input ends L1 and L2 and a power supply circuit. The two-phase variable frequency power source is characterized in that an H bridge inverter circuit I, an H bridge inverter circuit II and a control unit are respectively connected at the power supply input ends; the control unit is provided with pulse signal output ends A and B; pulse signals A and B that are adjustable in frequency are output by the control unit, and the half-wave diagonal drive of the H bridge inverter circuits I and II is realized under the action of an electronic reversing signal controlled by the control unit; the pulse signals A and B are same, but the pulse signal B lags behind the pulse signal A by 0-180 degrees in time sequence. The H bridge inverter circuits I and II work independently and a two-phase variable frequency power source signal is output at the output ends of the inverter circuit I and the H bridge inverter circuit II. The two-phase variable frequency power source has the advantages of simplicity in structure, stability in operation, high reliability and low cost, and can meet demands of industrial and civil occasions.
Description
Technical field
The present invention relates to a kind of two-phase variable frequency power supply and output intent thereof.
Background technology
In some industrial equipments and domestic electric appliance, often be furnished with " single phase alternating current (A.C.) induction motor ".In response to difference, can be divided into split-phase type motor, capacitor start formula motor etc. with classification.Be widely used in the household electrical appliance such as refrigerator, washing machine, air-conditioning.In packing, food, weaving, printing, postal service, medical treatment and various mechanical device, use also very extensively.
" single phase alternating current (A.C.) induction motor " is provided with main winding and auxiliary winding (startup winding) on winding.Two windings differ a very big phase angle, make electric current and magnetic flux in the auxiliary winding reach peaked time ratio main winding earlier, thereby can produce a magnetic flux around the stator rotation.Conductor on this rotating magnetic flux cutting rotor makes bigger electric current of rotor conductor induction, and magnetic flux that electric current produced and stator magnetic flux interact, and rotor just produces detent torque.Need two groups of different power supplys of phase place to drive.Strictly speaking, such motor should be called the two-phase electric machine of single-phase input.
China's regulation, end user's single-phase alternating current is 220V, three-phase alternating current electric wire voltage is 380V, is 50Hz (approximation) frequently.Need the neutral line, ground wire is generally also all arranged, be three-phase five-wire mode.Folk power supply uses three-phase electricity as floor or sub-district inlet wire, uses star connection more.And house lead in is a phase line, i.e. a phase in the three-phase, over the ground or voltage to neutral be 220V, be commonly called as single phase poaer supply.Most of domestic electric appliances, and part industrial electrical equipment equipment is all used single phase poaer supply.And major part all is to use three phase mains basically on the industrial equipment.
Owing in fact do not have real two-phase frequency-converting power supply in industry and civilian occasion.The startup of single phase alternating current (A.C.) induction motor (two-phase electric machine of single-phase input) and running need insert big capacity and start capacitor in starting winding; Utilize the physical characteristic of capacitor to carry out phase-splitting; Make the electrical phase angle of energising back main winding and auxiliary winding become 90 °; Thereby can produce bigger detent torque, make the rotor startup running.Because its operation winding divides positive and negative phase coiling setting, so as long as switchover operation winding and the serial connection direction that starts winding can be realized conveniently that motor is contrary, turn round along direction.The single phase alternating current (A.C.) induction motor is cumbersome in the adjustment control of revolution, need on motor, add the winding that tests the speed usually, measures this winding voltage, realizes through control device.Its complex structure, fluctuation of service, poor reliability, cost is higher.
Summary of the invention
The technical problem that the present invention will solve provide a kind of simple in structure, stable, reliability is high, cost is low, can satisfy the industry and the two-phase variable frequency power supply and the output intent thereof of civilian occasion needs.
Technical solution of the present invention is:
A kind of two-phase variable frequency power supply; Comprise power input L1, L2; Power circuit 1; Its special character is: be connected to the control unit 2 of H bridge inverter circuit I, H bridge inverter circuit II and exportable frequency adjustable pulse signal respectively at power circuit 1 output, control unit 2 is provided with A and B two pulse signals output and drives H bridge inverter circuit I respectively realizes the driving of half-wave diagonal angle, wherein B road pulse signal hysteresis A road signal on sequential with H bridge inverter circuit II.
Above-mentioned control unit 2 is provided with C, D two road electronic commutation signal controlling ends, and described A and B two pulse signals output are respectively through being connected by power device in the electronic commutator 3 of C, the control of D two road electronic commutation signal controlling ends and H bridge inverter circuit I, the H bridge inverter circuit II.
Above-mentioned H bridge inverter circuit I, H bridge inverter circuit II are made up of four power device Q1～Q4 and Q5～Q8 respectively; The control utmost point of described power device Q1～Q8 links to each other with A, the B two pulse signals output of control unit 2 respectively, and described H bridge inverter circuit I, H bridge inverter circuit II are drawn two groups of output U1, U2 and V1, V2 respectively.
Above-mentioned two-phase variable frequency power supply is connected to isolating diode D1 between power circuit 1 and H bridge inverter circuit I, H bridge inverter circuit II, in order to suppress the influence to power circuit of peak voltage that inverter circuit produces.
A kind of output intent of two-phase variable frequency power supply; The two-phase variable frequency power supply that employing is made up of power circuit 1, H bridge inverter circuit I, H bridge inverter circuit II and control unit 2; By power circuit 1 single phase poaer supply or three phase mains are become different direct voltage outputs; Pulse signal through control unit 2 output A, B two-way frequency adjustable; Described A and B two pulse signals are distributed according to sinusoidal rule according to circuit requirement by control unit 2 and set; Under by the electronic commutation signal effect of control unit 2 controls, realize that the half-wave diagonal angle of H bridge inverter circuit I and H bridge inverter circuit II drives; Described A, the B two pulse signals is identical but on sequential pulse signal hysteresis A road, B road pulse signal 0～180 degree, H bridge inverter circuit I and H bridge inverter circuit II work alone separately, export two-phase variable frequency power supply signal by inverter circuit I and H bridge inverter circuit II output.
Above-mentioned B road pulse signal is hysteresis A road signal 90 degree on sequential, to realize the output of two-phase quadrature variable frequency power supply.
The pulse signal fabric width of above-mentioned control unit 2 outputs is adjustable, to change the interchange equivalent voltage of output.
The invention has the beneficial effects as follows:
1, owing to adopts the dual H-bridge inverter circuit, the alternating voltage of the same period of independent output two tunnel outs of phase, 4 terminal outputs.Two road alternating voltage phase phasic differences, 0～180 degree (can adjust as required).
2, in general common frequency converter, single brachium pontis is two power tubes alternate conduction in a pulse period up and down.This just must strict control two manage ON times, and the PWM dead band must be set.In this two-phase variable frequency power supply, be employed in the forward and the reverse drive of independent diagonal angle brachium pontis half period of two waveforms of a sine wave period, i.e. " driving of half-wave diagonal angle " forbidden break-over of device, the reasonable dead-time problem that solved constantly in positive and negative half-wave switching-over; Also lower with time-harmonic wave, improved power factor.
3, control unit all can adjust the voltage of output and frequency through adjustment pulsewidth and positive half wave cycle; Can realize two-phase variable frequency power supply output, adjustable continuously (majority is 0～400Hz) two-phase alternating current power supply, can drive " single phase alternating current (A.C.) induction motor " easily thereby the alternating current of fixed-frequency (being generally power frequency 50Hz) is transformed into frequency; Having solved " single phase capacitor motor " needs the problem of frequency conversion; Satisfy motor-driven needs, and simplified the structure of motor, removed the additional motor that tests the speed of " single phase alternating current (A.C.) induction motor "; Reduced cost, stable, reliability is high.This two-phase quadrature variable frequency power supply also can be applicable to other occasion that needs the two-phase variable frequency power supply.
Description of drawings
Fig. 1 is a two-phase variable frequency power supply block diagram of the present invention;
Fig. 2 is the schematic diagram of the dual H-bridge circuit of inverter circuit among Fig. 1;
Fig. 3 is the sequential chart of the pulse signal of control unit output;
Fig. 4 is the timing waveform of H bridge inverter circuit I and H bridge inverter circuit II output signal.
Among the figure: power input L1, L2, power device Q1～Q8, output U1, U2 and V1, V2, main winding M1, auxiliary winding M2 connects, isolating diode D1, power circuit 1, control unit 2, electronic commutator 3.
Embodiment
Like Fig. 1, shown in Figure 2; A kind of two-phase variable frequency power supply; Comprise power input L1, L2; Power circuit 1; Be connected to the control unit 2 of H bridge inverter circuit I, H bridge inverter circuit II and exportable frequency adjustable respectively at power circuit 1 output; Control unit 2 adopts single-chip microcomputers in the present embodiment, and reality is not limited by present embodiment, and control unit 2 is provided with A and B two pulse signals output and C, D two road electronic commutation signal controlling ends; Through being connected by power device Q5～Q8 in power device Q1～Q4 in the electronic commutator 3 of two road electronic commutation signal controlling end C, D control and H bridge inverter circuit I and the H bridge inverter circuit II and the H bridge inverter circuit II and driving H bridge inverter circuit I respectively and H bridge inverter circuit II realizes the driving of half-wave diagonal angle, wherein pulse signal hysteresis A road signal 0～180 on sequential in B road is spent respectively for described A and B two pulse signals output.Described H bridge inverter circuit I, H bridge inverter circuit II are drawn output U1, U2 and V1, V2 respectively; Be connected with auxiliary winding M2 with the main winding M1 of motor M respectively during wiring, the single phase poaer supply of the fixed-frequency of input be transformed to the DC power supply of different voltages through power circuit 1.
Between power circuit 1 and H bridge inverter circuit I, H bridge inverter circuit II, be connected to isolating diode D1, in order to suppress the influence of peak voltage that the H bridge circuit produces to power supply.
With the single phase poaer supply is example; Adopt this two-phase variable frequency power supply that the method that single-phase electricity becomes two phase electricity is following: single phase poaer supply or three phase mains to be become different direct voltage outputs by power circuit 1; Present embodiment is example with the single phase poaer supply; Through the pwm pulse signal of control unit 2 output A, B two-way pulsewidth, frequency adjustable (frequency also can be fixed), to realize the output of two-phase variable frequency power supply and to change the interchange equivalent voltage of exporting.Described A and B two pulse signals are distributed according to sinusoidal rule according to circuit requirement by control unit 2 and set; Under by the electronic commutation signal effect of control unit 2 controls, realize that the half-wave diagonal angle of H bridge inverter circuit I and H bridge inverter circuit II drives; Described A, the B two pulse signals is identical and pulse signal hysteresis A road, B road pulse signal 0～180 degree on sequential; The angle that lags behind can be set according to specific requirement; And H bridge inverter circuit I and H bridge inverter circuit II work alone separately, by inverter circuit I and H bridge inverter circuit II output output two-phase variable frequency power supply signal.
As shown in Figure 3, pulse signal signal 90 degree in hysteresis A road on sequential in B road in the present embodiment are to realize the output of two-phase quadrature power supply.Wherein, the work schedule of H bridge inverter circuit II, the work schedule of hysteresis H bridge inverter circuit I, i.e. " time-delay ".The initial moment of each pulse of two pulse signals is synchronous, and according to principles of electric and electronic engineering design, width distributes according to sinusoidal rule equally, and waveform configuration is consistent.The wherein pulse signal of the sinusoidal rule of B road output hysteresis A road output on sequential.A sinusoidal waveform cycle; When adopting control unit 2 to be controlled at the positive half wave of setting; Make power device Q1 and Q4 in the H bridge inverter circuit I, according to the high-low level of A road start pulse signal, in conjunction with electronic commutation signal C from 0 spend to 180 the degree be interrupted triggering and conducting successively according to sequential; Thereby export positive half-wave voltage signal (H bridge inverter circuit I output pulse signal C part among Fig. 4), i.e. positive half wave inner opposite angle conducting.
In H bridge inverter circuit II, drive pulse signal B and the electronic commutation signal D that combines with it, the electronic commutation signal C that on sequential, all lags behind A road drive pulse signal and combine, hysteresis angle 90 degree with it.In the zero hour of power device Q1 and Q4 conducting; Make power device Q5 and Q8 relative A road drive pulse signal quadrature lagging on sequential in the H bridge inverter circuit II; The electronic commutation signal D triggering and conducting of carrying out B road drive pulse signal and combining with it realizes predetermined time-delay turn-on action.Thereby export positive half-wave voltage signal (H bridge inverter circuit II output pulse signal C part among Fig. 4), i.e. positive half wave inner opposite angle conducting.
Consequently, H bridge inverter circuit I is consistent with the output voltage waveforms of H bridge inverter circuit II.But the output voltage waveforms of H bridge inverter circuit II, hysteresis H bridge inverter circuit I output voltage waveforms on sequential.
When the negative half-wave of setting, make power device Q2 and the power device Q3 in the H bridge inverter circuit I,
High-low level according to A road start pulse signal; In conjunction with electronic commutation signal C from 180 spend to 360 the degree be interrupted triggering and conducting successively according to sequential; Thereby the half-wave voltage signal (H bridge inverter circuit I output pulse signal D part among Fig. 4) that output is negative, promptly negative half-wave inner opposite angle conducting.
In the zero hour of power device Q2 and Q3 conducting; And make power device Q6 and Q7 in H bridge inverter circuit II A road drive pulse signal quadrature lagging relatively on sequential; The electronic commutation signal triggering conducting of carrying out B road drive pulse signal and combining with it realizes predetermined time-delay turn-on action.Thereby the half-wave voltage signal (H bridge inverter circuit II output pulse signal D part among Fig. 4) that output is negative, promptly negative half-wave inner opposite angle conducting.
Consequently, H bridge inverter circuit I is consistent with the output voltage waveforms of H bridge inverter circuit II.But the output voltage waveforms of H bridge inverter circuit II, hysteresis H bridge inverter circuit I output voltage waveforms on sequential.
When positive and negative half-wave replaces; Constantly promptly in the integral multiple of 0 degree and 180 degree; Adopt electronic commutation signal C control; According to the signal that sinusoidal rule distributes and sets, power device Q1, Q4 and Q2, Q3 diagonal angle are triggered in conjunction with the A road in turn, thereby obtain having the pulse signal output that positive negative cycle changes at output.
The time-delay turn-on action of described power device Q5 and Q8 and power device Q6 and Q7 is identical with the time-delay turn-on action function of power device Q1 and Q4 and power device Q2 and Q3.
Learn the sinusoidal wave area (theoretical value) of the area equivalent of this positive negative pulse stuffing signal output in a sinusoidal period by the principles of electric and electronic engineering.Thus, H bridge inverter circuit I and H bridge inverter circuit II are independently exported positive and negative impulse waveform separately.Wherein the output of H bridge inverter circuit II on sequential comparatively speaking, the output of hysteresis H bridge inverter circuit I.Present embodiment has been realized two-phase quadrature variable frequency power supply function, thereby makes output U1, U2 and V1, V2 export continuously adjustable within the specific limits two-phase alternating current.
Claims (7)
1. two-phase variable frequency power supply; Comprise power input; Power circuit; It is characterized in that: be connected to the control unit of H bridge inverter circuit I, H bridge inverter circuit II and exportable frequency adjustable pulse signal respectively at power circuit output end, control unit is provided with A and B two pulse signals output and drives H bridge inverter circuit I respectively realizes the driving of half-wave diagonal angle, wherein B road pulse signal hysteresis A road signal on sequential with H bridge inverter circuit II.
2. two-phase variable frequency power supply according to claim 1; It is characterized in that: control unit is provided with C, D two road electronic commutation signal controlling ends, and described A and B two pulse signals output are connected through power device in the electronic commutator of C, the control of D two road electronic commutation signal controlling ends and H bridge inverter circuit I and the H bridge inverter circuit II respectively.
3. two-phase variable frequency power supply according to claim 1; It is characterized in that: H bridge inverter circuit I, H bridge inverter circuit II are made up of four power devices respectively; The control utmost point of described power device links to each other with A, the B two pulse signals output of control unit respectively, and described H bridge inverter circuit I, H bridge inverter circuit II are drawn two groups of outputs respectively.
4. two-phase variable frequency power supply according to claim 1 is characterized in that: between power circuit and H bridge inverter circuit I, H bridge inverter circuit II, be connected to isolating diode.
5. the output intent of a two-phase variable frequency power supply; It is characterized in that: adopt the two-phase variable frequency power supply of forming by power circuit, H bridge inverter circuit I, H bridge inverter circuit II and control unit; By power circuit single phase poaer supply or three phase mains are become different direct voltage outputs; Pulse signal through control unit output A, B two-way frequency adjustable; Described A and B two pulse signals are distributed according to sinusoidal rule according to circuit requirement by control unit and set; Under by the electronic commutation signal effect of control unit control, realize that the half-wave diagonal angle of H bridge inverter circuit I and H bridge inverter circuit II drives; Described A, the B two pulse signals is identical but on sequential pulse signal hysteresis A road, B road pulse signal 0～180 degree, H bridge inverter circuit I and H bridge inverter circuit II work alone separately, export two-phase variable frequency power supply signal by inverter circuit I and H bridge inverter circuit II output.
6. the output intent of two-phase variable frequency power supply according to claim 5 is characterized in that: B road pulse signal is hysteresis A road signal 90 degree on sequential, to realize the output of two-phase quadrature variable frequency power supply.
7. the method for two-phase variable frequency power supply output according to claim 5 is characterized in that: the pulse signal fabric width of control unit output is adjustable, to change the interchange equivalent voltage of output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100437480A CN102594161A (en) | 2012-02-25 | 2012-02-25 | Two-phase variable frequency power source and output method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100437480A CN102594161A (en) | 2012-02-25 | 2012-02-25 | Two-phase variable frequency power source and output method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102594161A true CN102594161A (en) | 2012-07-18 |
Family
ID=46482452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100437480A Pending CN102594161A (en) | 2012-02-25 | 2012-02-25 | Two-phase variable frequency power source and output method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102594161A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346722A (en) * | 2013-06-27 | 2013-10-09 | 中国船舶重工集团公司第七一二研究所 | Method for independently controlling all phases of transverse magnetic flux motor |
| CN103546082A (en) * | 2013-11-12 | 2014-01-29 | 黑龙江大学 | Reversible dual power space vector inverter circuit and control method for single-phase asynchronous motor |
| CN103795321A (en) * | 2014-01-22 | 2014-05-14 | 合肥科瑞电子有限责任公司 | Single-phase capacitor running asynchronous motor variable-frequency drive method |
| CN106525903A (en) * | 2016-11-06 | 2017-03-22 | 中国计量大学 | Pulsed eddy current thermal imagery detecting system based on rotational magnetic field excitation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101039094A (en) * | 2007-02-02 | 2007-09-19 | 清华大学 | Multi-level frequency conversion driving apparatus with energy conservation unit |
| CN201142659Y (en) * | 2007-12-21 | 2008-10-29 | 上海电器科学研究所（集团）有限公司 | Double-H bridge structure of permanent-magnet motor frequency conversion controller |
| CN202455278U (en) * | 2012-02-25 | 2012-09-26 | 穆星宇 | Two-phase variable-frequency power supply |
-
2012
- 2012-02-25 CN CN2012100437480A patent/CN102594161A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101039094A (en) * | 2007-02-02 | 2007-09-19 | 清华大学 | Multi-level frequency conversion driving apparatus with energy conservation unit |
| CN201142659Y (en) * | 2007-12-21 | 2008-10-29 | 上海电器科学研究所（集团）有限公司 | Double-H bridge structure of permanent-magnet motor frequency conversion controller |
| CN202455278U (en) * | 2012-02-25 | 2012-09-26 | 穆星宇 | Two-phase variable-frequency power supply |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346722A (en) * | 2013-06-27 | 2013-10-09 | 中国船舶重工集团公司第七一二研究所 | Method for independently controlling all phases of transverse magnetic flux motor |
| CN103346722B (en) * | 2013-06-27 | 2016-04-20 | 中国船舶重工集团公司第七一二研究所 | Each phase method for independently controlling of transverse flux motor |
| CN103546082A (en) * | 2013-11-12 | 2014-01-29 | 黑龙江大学 | Reversible dual power space vector inverter circuit and control method for single-phase asynchronous motor |
| CN103546082B (en) * | 2013-11-12 | 2016-04-20 | 黑龙江大学 | For reversible dual power space vector inverter circuit and the control method of monopole asynchronous motor |
| CN103795321A (en) * | 2014-01-22 | 2014-05-14 | 合肥科瑞电子有限责任公司 | Single-phase capacitor running asynchronous motor variable-frequency drive method |
| CN103795321B (en) * | 2014-01-22 | 2016-05-25 | 合肥科瑞电子有限责任公司 | Single-phase capacitor operation asyn. motor frequency conversion drive method |
| CN106525903A (en) * | 2016-11-06 | 2017-03-22 | 中国计量大学 | Pulsed eddy current thermal imagery detecting system based on rotational magnetic field excitation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Becerra et al. | Commutation of SR motors | |
| Holmes et al. | Variable speed control of single and two phase induction motors using a three phase voltage source inverter | |
| CN102106069B (en) | Electric power converter | |
| CN101355321B (en) | Multiple power conversion apparatus and multiple transformer | |
| CN112350619B (en) | Device for driving a plurality of motors and electrical apparatus comprising the same | |
| CN105337541A (en) | Multi-phase brushless direct current motor and driving method thereof | |
| CN102594161A (en) | Two-phase variable frequency power source and output method thereof | |
| CN100502198C (en) | Multi-standard UPS power supply and realizing method thereof | |
| CN107294435A (en) | The intensive frequency converter of three-phase synchronous motor | |
| RU2420857C1 (en) | Semiconductor device to control speed of single-phase double-winding induction motor | |
| CN107425683B (en) | Compressor, air conditioner and control method of electrifying mode of compressor winding | |
| CN102217187A (en) | Method for the operation of synchronous motors, and associated device | |
| RU162848U1 (en) | SEMICONDUCTOR REVERSE DEVICE FOR STARTING AND OPERATING A THREE-PHASE ASYNCHRONOUS MOTOR SUPPLY FROM A SINGLE-PHASE AC NETWORK | |
| CN202455278U (en) | Two-phase variable-frequency power supply | |
| JP2013258826A (en) | Digital controller of single-phase ac motor | |
| CN107017782B (en) | Friendship-friendship phase shift frequency changer circuit motor and its circuit control system are exported based on high-frequency | |
| CN107707158B (en) | Frequency converter comprehensive braking system and working method thereof | |
| Darbali-Zamora et al. | Single phase induction motor alternate start-up and speed control method for renewable energy applications | |
| CN206432928U (en) | A kind of single-phase motor variable frequency drive | |
| CN105024396A (en) | Energy feedback frequency converter | |
| RU185627U1 (en) | Semiconductor control device for single-phase two-winding induction motor | |
| JP5566796B2 (en) | Inverter generator parallel operation system | |
| CN205490006U (en) | Polyphase AC motor structure and drive circuit thereof | |
| CN204633527U (en) | A kind of stepless speed-regulating motor technology is boring the utilization device of milling equipment | |
| CN204030997U (en) | A kind of matrix form AC-dc converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120718 |