CN107623476A

CN107623476A - The permanent anti-frequency converter of threephase asynchronous machine

Info

Publication number: CN107623476A
Application number: CN201710877714.4A
Authority: CN
Inventors: 不公告发明人
Original assignee: Wuhan Hao Lin Lighting Electronics Co Ltd
Current assignee: Wuhan Hao Lin Lighting Electronics Co Ltd
Priority date: 2017-09-16
Filing date: 2017-09-16
Publication date: 2018-01-23

Abstract

The present invention relates to the permanent anti-frequency converter of threephase asynchronous machine, the popular low cost application of micro-machine can be widely used in, and the functional promotion of power motor on this basis, 1 is that 200hz vibrates fundamental wave in figure, 2 be that speed governing triggers negative pulse, 3 be that a phases load output, 4 be that b phases load output, 5 be that c phases load output, 6 be that the equivalent of near sinusoidal three exports, three-phase speed governing output is to change three-phase frequency to change the number of loading ripple, and the frequency for loading ripple is constant, reaches motor constant frequency rate to the purpose of constant-impedance.

Description

The permanent anti-frequency converter of threephase asynchronous machine

Technical field

The present invention relates to the permanent anti-frequency converter of threephase asynchronous machine, and can be widely used in the popular low cost of micro-machine should With, and the functional promotion of power motor on this basis.

Background technology

Threephase asynchronous machine frequency converter is designed by synchronous frequency conversion and transformation at present, and asynchronous machine impedance is preferable not to the utmost, When conversion frequencies are relatively low, motor impedance very little, small voltage exchange is close to direct current in a waveform, easily cause magnetic saturation and Reduce torque output, be directed at the excessive heating of electric current.

The content of the invention

The running of variable-frequency motor, non-sine can be by capacitor and inductor amendments, and higher hamonic wave can be by capacitive absorption, electricity The main reason for machine generates heat should be that AC coil is crossed direct current and caused, and it is much lower that DC coil crosses required voltage during exchange, such as For fruit frequency converter by digital carrier modulation, no matter high or low electric machine frequency is, and it is constant to modulate the square wave quantity of three-phase, when speed adjustable range ratio When wider, carrier frequency difference is bigger, and the output impedance difference formed is also big, if setting rated impedance by centre frequency, It is unaffected that heat is readjusted the distribution upwards, and simply output torque reduces, and is also comparable to be changed into equivalent to the very big square wave frequency difference of downward Direct current.Permanent anti-frequency converter is forming three waveform approximations just with fundamental oscillation speed frequency division, the phase difference of three ripple two-stage three, two step voltages String, three phase differences form three-phase alternating current, and every three waveforms are all made up of fundamental wave, and crossover frequency is three-phase output frequency, and fundamental wave is frequently Rate is constant motor impedance frequency, i.e., no matter the frequency of frequency conversion output changes, and fundamental frequency is constant, then in the slow-speed of revolution When motor coil and high rotating speed when motor coil impedance be the same, be so constant-power speed regulation, using digital regulation and control Frequency converter, the connection of output three-phase three wire triangle, it is divided into fundamental oscillation, speed governing is stirred in counter increase and decrease, and counter frequency dividing, three is defeated Enter generation 6 arm sequential of inverter bridge of the circulation of four 0 two 1 of nor gate and shift register, numeral output and bridge arm are light Coupling is of coupled connections, and circuit structure is succinct, and frequency converter is no longer luxury goods, can turn into the frequency conversion that common size motor device is afforded to use Device.When input is 50hz three-phase alternating currents, it rectification can directly be inputted for frequency converter, realize and hand over control, it is single-phase to use daylight During circuit for lamp rectification, frequency converter can be made small, and comprehensive push button function realizes whole controls of small electric apparatus, when the permanent moment of torsion of needs During output, frequency converter input can separately add Switching Power Supply synchronization pressure regulation, and more perfect function is that sequential is under this circuit same procedure Four 0 two 1 four 0 two 1 totally 12 circulations again, using the arm bridge inversion of phase three-wire three 12, triangle connects 6 arms, triangle Shape summit connects external 6 arms of 3 inductance, the optimization sine wave under the step voltage of 6 ripple four, then fundamental wave loading, can reach ratio of precision compared with High frequency conversion quality.

Brief description of the drawings

It is the permanent anti-frequency converter circuit diagram of application threephase asynchronous machine of the present invention as shown in Figure 1

It is illustrated in figure 2 using the permanent anti-frequency converter oscillogram of threephase asynchronous machine of the present invention

Embodiment

It is as shown in Figure 1 the permanent anti-frequency converter circuit diagram of application threephase asynchronous machine of the present invention, IC1 is 74HC14 chips in figure 6 Schmidt's reversers, button switch S1 connects the pin of Schmidt 5, S2 connects 9 pin, and the pin of reverser 6 and 8 pin export button CP to counter Adding count pulse and subtract count pulse, C1, C2 are switch debounce dynamic condenser, and two pin of Schmidt 1,2,12,13 are fundamental oscillation, R1 is that 51K, C3 are 333 to do oscillation delay, and output 200hz or so fundamental waves, R2 is switch S1, S2 pull-up resistor, and R3 is that chip puts 1 Resistance.

IC2 be 74HC193 chips four can preset forward-backward counter, 16 grades of buttons are adjustable from 12.5hz to 200hz is adjusted Series is divided, the 3.18hz of output 1/4th is to 50hz three-phase alternating currents, and 1,9,10,15 pin put number and put 1, and pin 2,3,6,7 is button 4 counting outputs, 4,5 pin are the manual pulse increase and decrease input of button switch, and 12 pin are plus count the low level of carry-out to 11 Pin puts number, and for being pressed during button full scale in highest point, 13 pin are to subtract the low level counted when borrowing low level and the shutdown of output 11 pin clear 0 are given by NAND gate, presses when reducing to bottom for button and is started in lowest part, or low speed.

IC3 be similarly 74HC193 chips four can preset forward-backward counter, 4 positional numbers are that 4, button counts output, are touched Cp is sent out as vibration fundamental wave, one carry pulse of complete 1 output is added on preset number, as next stage sequential trigger pulse, simultaneously Again put number to do plus count again, so button IC2 counters have adjusted IC3 counters and put number, IC3 fills it up with counting from preset count to Device is the frequency regulation of output three-phase, and wiring is connected as the counting output that 1,9,10,15 pin meet IC2, and it is outstanding that 2,3,6,7 pin count output Sky, 4,13 pin are connected with subtracting to count to borrow output, abandon and subtract counting, and 5 pin connect vibration output, and the pin of carry-out 12 is put to 11 pin Number, while next stage cp is used as, 14 pin connect high level no clear 0.

IC4 is that the tunnel 3 of 74HC27 chips three inputs nor gate, and one of pin of nor gate 8,9,10,11 does next stage sequential Control input, another pin of nor gate 1,2,12,13 make button clear 0, and the pin of nor gate 3,4,5,6 makees reverser.

IC5 is the input of the bit string of 74HC164 chips 8 and Output Shift Register, data pass through two pin strings of input 1 or 2 Row input, any input can be enabled with high level, and two inputs can also connect together, and the pin of 1 pin 2 connects together in figure comes From in the pin of output 8 of IC4 NAND gates, pin 3,4,5,6,10,11,12,13 is parallel output, and 4 pin connect IC4 11 pin, and 5 pin connect IC4 10 pin, 6 pin connect IC4 9 pin, and pin 4,5,6 is shown in that 1 goes out 0 full 0 and goes out 1 by nor gate, as 4,5,6 pin have 1 if after displacement extremely Go out 30 less, 40 are added as when 3 pin are 0, then form the circulation of four 0 two 1, most have more four 0 when 3 pin are 1, also shape Into four 0 two 1 circulations.When it is 1 that 4,5,6, which are all 0,3, then go out one 1, forming two 1 must be all when 4,5,6 to four 0 0,3 be 0 when, be exactly four 0 must to two 1, input triggering cp 8 pin connect the 12 pin carry-outs for coming from IC3,9 pin clear 0 Low level, which comes from, shuts down 10 pin that high level passes through IC1 Schmidt's reversers, is not exported when shutting down, export as 3,4,5, 6th, 6,10,11 pin.

OS1, OS2 TLP521-4 are two pieces of integrated optocouplers, and the input of six optocouplers connects IC5 6 outputs, six optocouplers Output control inverter bridge six arms, the input of the 7th optocoupler meets IC3 12 pin carry-out cp, shows as coupling frequency It is that optocoupler inputs current-limiting resistance to show output cp, R4, and the 8th optocoupler is start relay, is connected by optocoupler input and output, and Two button switches S3, S4 of parallel connection in input and output, S4 is pressed as start self-locking, S3 is pressed and then disconnects, on pull-up resistor R8 Output start low level and shutdown high level, export IC5 clear 0 during shutdown to button speed governing IC2 and three-phase.

T0 is signal loading triode, and fundamental signal biases the gate pole of R5, aerial drainage R6 control triode, loading by resistance To six inputs of optocoupler, R7 is loading optocoupler current-limiting resistance, and triode A03402 encapsulates for paster.

Frequency converter exports inverter bridge and is made up of the N pipes of six triodes T1, T3, T5 P pipes and T2, T4, T6, four 0 liang For individual 1 digital loop by the gate pole of optocoupler difference six triodes of sequential control, R9 is three P pipe biasing resistors 100K, R10 For positive bias divider resistance 1M, R11 is three N pipe biasing resistor 100K, and optocoupler is connected between gate pole and biasing resistor, L1, L2, L3 are three groups of coils of motor, and output three-phase a, b, c to motor coil connects for triangle, and C4, C5, C6 continue for motor coil Electric capacity is flowed, V+ and V- is input direct-current both positive and negative polarity, and V/2 comes from the series connection of two coils of motor, at cutting magnetic line difference angle Though degree has deviation, all near V/2, waveform recoil can improve output torque during operation, and three-phase output is adjusted by two step voltages Sine wave, loading ripple are motor constant frequency.

It is 10K that what map parameter was set, which puts number with pull-up resistor, and current limliting and bleeder resistor are 1K, debounce electric capacity 101, afterflow Electric capacity 104, P pipes IRF9530, N pipe IRF530,2.2kw motor inverters can be used as.

It is illustrated in figure 2 and applies the permanent anti-frequency converter oscillogram of threephase asynchronous machine of the present invention, 1 is that 200hz vibrates base in figure Ripple, 2 be that speed governing triggers negative pulse, and 3 be that a phases load output, and 4 be that b phases load output, and 5 be that c phases load output, and 6 be near sinusoidal Three equivalents export.Three-phase speed governing output is to change three-phase frequency to change the number of loading ripple, and the frequency for loading ripple is constant, Reach motor constant frequency rate to the purpose of constant-impedance.

Claims

1. the present invention relates to the permanent anti-frequency converter of threephase asynchronous machine, can be widely used in the popular low cost of micro-machine should With, and the functional promotion of power motor on this basis, permanent anti-frequency converter is with fundamental oscillation speed frequency division, three ripple two-stage three-phases Potential difference, two step voltages form three waveform near sinusoidals, and three phase differences form three-phase alternating current, and every three waveforms are all made up of fundamental wave, Crossover frequency is three-phase output frequency, and fundamental frequency is constant motor impedance frequency, i.e., no matter the frequency of frequency conversion output changes, Fundamental frequency is constant, then in the slow-speed of revolution when motor coil and high rotating speed the impedance of motor coil be it is the same, so It is constant-power speed regulation, using the frequency converter of digital regulation and control, the connection of output three-phase three wire triangle, is divided into fundamental oscillation, counts Speed governing, counter frequency dividing, the generation inversion of the circulation of four 0 two 1 of three input nor gates and shift register are stirred in device increase and decrease 6 arm sequential of bridge, numeral output are of coupled connections with bridge arm for optocoupler, and circuit structure is succinct, and frequency converter is no longer luxury goods, can be into The frequency converter afforded to use for common size motor device.