CN102468777A

CN102468777A - Novel large-scale inverter

Info

Publication number: CN102468777A
Application number: CN2010105421028A
Authority: CN
Inventors: 孔和平
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-11-03
Filing date: 2010-11-03
Publication date: 2012-05-23

Abstract

In the novel large-scale inverter of the invention, two copper rings which can perform direct current input are used; anodes and cathodes of the copper rings are connected to a plurality of arc commutators respectively; a motor which can perform stepless speed regulation, a capacitor, an induction loop (primary transformer) and the like are added. Therefore, a direct current can be directly converted into a large power alternating current and a grid-connected requirement can be satisfied. Compared to a large-scale electronic circuit inverter, According to the invention, a structure is simple, operation is reliable, an output waveform is good, costs are low and it is easy to perform frequency modulation and phase angle adjustment. And the inverter of the invention can be used in the direct-current variable three-phase alternating current with more than a megawatt grade. In the appended drawings, (1) is the speed regulating motor; (2) is a support; (3) are direct current input carbon brushes; (4) is alternating current output; (5) are the direct current input copper rings; (6) are the alternating current commutators; (7) is an insulator and (8) is an insulation rotating body.

Description

Large-scale new-type inverter

But the invention reside in two copper rings that have direct current input, copper ring just, negative pole connects the commutator that the polylith circular arc type is formed respectively; But add the motor of stepless time adjustment, capacitor, induction coil (primary) etc.; Can directly direct current be become the high power AC electricity, and can reach the requirement of being incorporated into the power networks.

Compare with large-scale electronic circuit inverter, the present invention has simple in structure, and is reliable, good output waveform, and cost is low, and frequency modulation and phase modulation parallactic angle be also than being easier to, and particularly the present invention can be used for the above direct current of MW class and becomes in the three-phase alternating current and just use.

The principle of the invention is such: with one can be direct current machine; Or the positive and negative galvanic copper rings of two of the small-sized stepless time adjustment driven by motor of AC frequency modulation input, the copper ring that is arranged in the commutator both sides connect by just, at interval, the copper segment of negative level checker.Copper segment is an evenly distributed circle on insulated column, and every interbody spacer is the width of copper segment, and on copper ring, commutator, loads onto the input and output carbon brush respectively.Thereby copper ring and commutator diameter can be different, but both must be positive with one heart circular.Connecting with buncher also must be with one heart.After more than installing, direct current is inserted carbon brush, commutator output is connect capacitor and primary.If the output single-phase alternating current, symmetry installation two carbon brush get final product on output reverser, export three-phase electricity if desired; Copper segment only needs positive and negative each a slice; Positive and negative copper segment with respectively account for each other at interval 1/4th, three pairs of carbon brush symmetries and differ 120 ° of phase angles each other by A, B, C and install and get final product, but the output AC electricity will reach 50 He Zhi; Speed must reach 3000 rev/mins after motor speed or the speed change; Obviously, speed is high all can be influential to the reliability of motor, commutator, carbon brush etc., particularly in order to increase the transfer power of inverter; We should be by 6,18,30,42 ... Increase the commutator segment number, by 18,54,90,126 ... Increase the carbon brush number.Certainly, the commutator equal diameter is also answered corresponding increase, and commutator speed is also reduced to 1000,333,200,143 rev/mins, for increasing power output, also can increase commutator length in addition, and each carbon brush can increase by 1 to several side by side.Power output just can be multiplied like this., the commutator speed drop whenever turns around after getting off having had 3,9,15,21 ... Group A, B, C are with order, and the three-phase alternating current output with voltage homophase parallactic angle is in parallel all A, and all B are in parallel, and all C are in parallel.Also obtain the output of total three-phase six line alternating currents to all respectively by respectively being in parallel with A, B, C symmetry output A ' B ' C ', it is connect capacitor respectively and three-phase transformer is elementary gets final product.

Just there are two with the capacitor purpose in the present invention; When passing through, carbon brush commutates copper sheet when leaving first; Can prevent the induced current impact that moment produces; Second when carbon brush leaves copper segment through spacer region, replenish the back half period as power supply, just output current wave becomes complete sinusoidal waveform.

If the output three-phase electricity need be incorporated into the power networks the time, can be regulated motor speed repeatedly and reached can be incorporated into the power networks after the secondary A of output transformer, B, C three-phase electricity voltage, frequency, phase angle etc. and the synchronized and send.The present invention also can regulate each phase angle of three-phase electricity through angle between adjusting carbon brush and the commutator.

Structure of the present invention is such, and shown in Figure of description 1: buncher 1 is attached to insulation cylinder 8 through support 2 inner bearings, and direct current input copper ring 5 is housed on the insulation cylinder 8, the commutator 6 that copper ring 5 connects, and 7 is the width of commutator segment at interval.And then attachment bracket 2 inner bearings.Buncher 1, insulation cylinder 7, direct current input copper ring 5, commutator etc. all must be just round with one heart, under motor 1 drives, can both freely rotate.Load onto the carbon brush 3 of importing positive and negative electricity at the input copper ring then and load onto the electric carbon brush 4 of output AC at commutator 6, what A, B, C and A ' B ' C ' exported is three-phase six-wire system.Figure of description 2; Be the tie lines figure and the sketch map of 6 commutators 6 and 18 carbon brush 4, A among the figure ₁A ₂A ₃Parallel connection obtains A, A ₁' A ₂' A ₃' parallel connection obtains A ', obtains A, A ', B, B ', C, C ' by that analogy also above place in circuit 9 respectively.Obtain A, B, C three-phase alternating current through transformer etc. at transformer secondary output.

Claims

1. but the invention reside in copper ring and commutator with two input dc powers of stepless time adjustment driven by motor; Motor rotates inversion is treated in the back with the carbon brush input direct current; Through commutator, capacitor, carbon brush etc. to primary output two-phase or three-phase alternating current, at secondary two-phase or three-phase alternating current after obtaining transformation.

According to 1, the stepless time adjustment motor plays fm role, size is decided as required, direct current input copper ring, commutator available copper, metal or alloy that the silver conduction is good etc., its diameter, wide, thick etc. determines according to power output.

According to 1,2, be equally wide at interval between the width of commutator segment and two.The several two above three-phase electricity of commutator space-number and sheet are used an odd number and are taken advantage of six just can obtain, commutator segment be by one just, one at interval, one negative, one at interval ... evenly distributed, install.

According to 1,2,3, the carbon brush number takes advantage of 3 for the commutator segment number, and presses

A, B, C, to differ 120 ° of phase angles each other evenly distributed.For increasing transfer power, direct current input carbon brush can increase the carbon brush amount, and exchanging carbon brush increases and need increase on the position side by side.

5. parallelly connected through same-phase according to the alternating current of 1,2,3,4 carbon brush output, obtain the three-phase six-wire system alternating current through capacitor, insert transformer by the secondary three-phase alternating current that obtains.The frequency of output three-phase electricity, phase angle can be regulated through buncher, and the phase angle is scalable carbon brush and commutator position also.