Povratne informacije dobavitelju enote: Inercialno parkiranje frekvenčnega pretvornika je ena od metod parkiranja za frekvenčni pretvornik, druga metoda pa se imenuje zaviranje parkiranja.
Brezplačno parkiranje frekvenčnega pretvornika
Inercijsko parkiranje, znano tudi kot prosto parkiranje. Po takojšnji zaustavitvi izhoda frekvenčnega pretvornika z izklopom napajanja, prekinitvijo krmilnega signala delovanja itd. motor še naprej drsi z vztrajnostjo, ki nastane med lastnim delovanjem, dokler se ne ustavi. Ta metoda ne ustvarja povratne napetosti znotraj frekvenčnega pretvornika.
Naša vrata so opremljena s prostim parkiranjem, vrtijo se naprej in nazaj ter nato delujejo na 50 Hz. Po trisekundnem ustavljanju bo preklop na 50 Hz povzročil omejitev toka in ne bo poročal o preobremenitvi. Ali je ta tok mogoče omejiti? Kolikšen je tok? Med testiranjem sem poročal o preobremenitvi. Pojasnilo: Frekvenčni pretvornik je opremljen z motorjem, ki je razbremenjen. Normalno delovanje s tokom nad 30.
After receiving the shutdown command, the frequency converter immediately stops outputting and the load stops freely according to mechanical inertia. The frequency converter shuts down by stopping the output. At this point, the power supply to the motor is cut off, and the drive system is in a free braking state. Since the length of the shutdown time is determined by the inertia of the drive system, it is also known as inertia shutdown.
The frequency converter stops the output and stops the vehicle. At this time, the power supply to the motor is cut off, and the drive system is in a free braking state Due to the fact that the length of parking time is determined by the inertia of the towing system, it is called inertial parking During inertia parking, attention should be paid not to start the motor before it has truly stopped. If you want to start, brake first and wait for the motor to stop before starting This is because the difference between the motor speed (frequency) at the moment of starting and the output frequency of the frequency converter is too large, which can cause excessive current in the frequency converter and damage the power transistor of the frequency converter.
Inverter braking and parking
Braking parking, also known as slope parking. Braking and parking can be divided into DC braking, power braking, feedback braking, hybrid braking, and mechanical braking.
The choice of parking method for the frequency converter depends on the required parking time on site. Usually, when the required parking time is less than the free parking time, braking and deceleration parking should be selected.
Direct current braking (i.e. supplying a certain amount of direct current to the power supply); Power braking (using resistors to dissipate energy); Hybrid braking (DC braking+power braking); Feedback braking (injecting the generated current into the power grid); Brake mechanical braking.
Parking is divided into inclined wave parking and free parking (fast parking is also inclined wave parking, but the slope is steeper).
Braking also includes mechanical braking (such as holding brakes), energy consumption braking (braking resistors, reverse braking, DC braking, etc.), feedback braking, etc. The need for braking is related to the operation status of the motor. When the required parking time is less than the free parking time during oblique wave parking, braking is required; Sometimes braking is also required when the motor is running normally, such as when the hook is lowered.
The working mode of resistance energy consumption braking
The method used for resistance energy consumption braking consists of two parts: the braking unit and the braking resistor, which consume electrical energy in high-power resistors through built-in or external braking resistors to achieve four quadrant operation of the motor. Although this method is simple, it has the following serious drawbacks.
(1) Preprosto zaviranje s porabo energije včasih ne uspe pravočasno zatreti napetosti črpalke, ki nastane zaradi hitrega zaviranja, kar omejuje izboljšanje zavorne zmogljivosti (velik zavorni navor, širok razpon hitrosti, dobra dinamična zmogljivost).
(2) Izguba energije zmanjšuje učinkovitost sistema
(3) Upor se močno segreje, kar vpliva na normalno delovanje drugih delov sistema.
Metoda podpornega zaviranja: Elektromotor poganja velike vztrajnostne obremenitve (kot so centrifuge, portalni skobeljniki, predorski vagoni ter velika in majhna vozila) in zahteva hitro zaviranje ali ustavljanje; Elektromotorji poganjajo potencialne energijske obremenitve (kot so dvigala, žerjavi, rudniška dvigala itd.); Elektromotorji so pogosto v vlečnem stanju (kot so pomožni stroji centrifug, motorji vodilnih valjev papirnih strojev, stroji za raztezanje strojev za kemična vlakna itd.). Skupne značilnosti teh vrst obremenitev zahtevajo, da elektromotorji delujejo ne le v električnem stanju (prvi in tretji kvadrant), temveč tudi v stanju proizvodnje energije in zaviranja (drugi in četrti kvadrant).
V pogonskem sistemu, ki ga sestavljajo električno omrežje, frekvenčni pretvornik, motor in breme, se energija lahko prenaša dvosmerno. Ko motor deluje kot elektromotor, se električna energija prenaša iz omrežja v motor prek frekvenčnega pretvornika, kjer se pretvori v mehansko energijo za pogon bremena, ki ima zato kinetično ali potencialno energijo. Ko breme sprosti to energijo, da spremeni stanje gibanja, motor poganja breme in preide v generatorski način delovanja, kjer pretvori mehansko energijo v električno energijo in jo dovaja nazaj v frekvenčni pretvornik na vhodu. Te povratne energije se imenujejo regenerativne zavorne energije in se lahko dovajajo nazaj v omrežje prek frekvenčnega pretvornika ali pa se porabijo v zavornih uporih na enosmernem vodilu frekvenčnega pretvornika (poraba energije pri zaviranju).
Priložnosti, ko se ustvari zavorna energija
1. Hiter proces zaviranja pri veliki vztrajnostni obremenitvi
2. Postopek spuščanja težkih predmetov v dvižni opremi
3. Postopek spuščanja oslične glave črpalne enote