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What is inverter?
The inverter is a device that changed frequency electric current to the coil placed inside the engine and through which can control the motor speed stepless way, do not use the mechanical gearbox.
We have the formula for speed 3-phase AC motors are as follows:
To change the speed of the engine we have 3 methods:
Change the number of motor poles P.
Changing the slip s.
And changing the frequency f of the input voltage. And Inverter is a device used to change the frequency of the supply of 3-phase alternating current to the motor which change according to the engine speed above formula.
The principle of operation of the Inverter:
Phase AC power source 1 or 3 phase power rectifier and filter into one-way flat. This step is performed by diode bridge rectifier and a capacitor. Thus, the power factor of the inverter system cosphi are valid regardless of the load and is worth at least 0.96
Internal circuit diagram of Inverter
DC voltage above will be modified (Inverter) into 3-phase AC voltage symmetry. Initial DC voltage is generated will be stored in the capacitor rig.
Next, through the activation sequence opens IGBT (bipolar transistors with insulated gate) of the Inverter will create a three-phase AC voltage by means of pulse width modulation (PWM).
Thanks to the technological advancement of microprocessor and semiconductor technologies currently power, switching frequency pulses can reach ultrasonic frequency range to reduce the engine noise and reduce losses in the iron core motors.
Principle circuit diagram Inverter motivation
System 3-phase AC voltage at the output can change the value amplitude and frequency depending on the controller level (the need to increase or decrease the speed of the engine). In theory, between frequency and voltage with a certain rule, depending on the control mode. For constant torque load, making the voltage - the frequency is constant.
Power conversion efficiency of the inverter is very high because of the use of power semiconductor components are manufactured according to modern technologies. Thus, power consumption is approximately equal energy required by the system.
In addition, today's inverter has integrated a lot of different styles suitable controls most of the different load types. Today inverter integrated PID and suitable for many different communication standards, very suitable for the control and monitoring of SCADA systems.
The basic parts of the Inverter:
Anatomy of Inverter include input rectifier, inverter blocks and controls.
3.1. Rectifier (diode):
Rectifier diode bridge rectifier is similar to commonly found in power supplies, including AC voltage is converted into DC. After the rectifier voltage across platforms voltage filter capacitor to have a flat, stable (DC Bus) to provide power to the IGBT.
3.2. Inverter (IGBT):
Fast IGBT switching devices and high performance. In controlled IGBT Inverter click to open in sequence to generate pulses with different widths from stable DC voltage stored in the capacitor.
By using a modulation method PWM, IGBT can be enabled in the order to open the output format is the same as similar to sine song.
PWM can be used to generate output for parallel motors with sinusoidal identical. This signal is used to control the speed and torque of the engine.
3.3. Controls:
The control will be connected to peripheral circuits receive signals into the main IC controller Inverter configuration and user settings.
- IC chính để xử lý thông tin và điều khiển hoạt động của Biến Tần.
- Ngõ vào Analog: nhận tín hiệu điện áp từ 0-10V.
- Ngõ vào số: để kích hoạt cho Biến Tần chạy.
- Ngõ ra Analog: kết nối với thiết bị ngoại vi khác để giám sát hoạt động của Biến Tần.
- Ngõ ra số: xuất tín hiệu chạy hoặc cảnh báo.
The accessories of Inverter
4.1. Ministry AC resistance (AC Reactor):
AC reactor is a coil is wrapped around the steel core. Helps reduce harmonic distortion, ie noise reduction on the AC input. In addition, AC reactor reduces peak amplitude input thorns, but visibly reduced DC Bus will help stabilize and increase longevity.
AC reactor can act as a filter to the rectifier circuit input protection from noise and harmonics caused by enabling or disabling the other inductive loads.
4.2. Reactors A (DC Reactor):
When mounted reactor Inverter DC to DC power bus will be stable, large energy reserves against changes in voltage input portion of IGBT Inverter when raising resources for full load operation.
In addition, one-dimensional reactor will return to the source noise reduction caused by the Inverter.
4.3. Braking resistor (Braking Resistor):
Typically variable frequency motor drive running, stopping or braking when the motor is then converted into motor with large power generators. Usually Inverter will control the timing of the engine brake is not reasonable to happen overload. If the request is urgent, the engine stops this energy must be consumed less.
And electric brake support helps Inverter that energy consumption. Variable resistors into heat energy.
Without braking resistor, each deceleration, the inverter can be caused by over-voltage error on the DC bus.
Inverter applications in industry:
A special feature of the drive powertrains - engines that you can adjust motor speed stepless. Ie by adjusting the frequency you can adjust the engine speed changes desired in a wide range.
Use the inverter semiconductor, flexible engine automatically identifies; control features via a network; can set 16 speed levels; control lines to help start the engine startup process smoothly (soft) advanced mechanical structural strength; minimize the cost of installation, maintenance; saving installation space; the energy-saving mode, ...
You will no longer worries about not being employed, controlled energy transmission process because from now you can control it via the mode overload protection, over temperature, over current, too voltage, low voltage, phase loss error, phase difference, ... of the inverter.
Inverters are used Wray in industrial applications such as: Elevators, conveyors, cranes, boilers, pumps, packaging machines, textile machines, spinning machines, plastic injection machines ...
Notes on using the Inverter:
+Tùy theo ứng dụng mà bạn lựa chọn bộ biến tần cho phù hợp,theo cách đó bạn sẽ chỉ phải trả một chi phí thấp mà lại đảm bảo độ tin cậy làm việc.
+Bên trong bộ biến tần là các linh kiện điện tử bán dẫn nên rất nhạy cảm với điều kiện môi trường, mà Việt Nam có khí hậu nóng ẩm nên khi lựa chọn bạn phải chắc chắn rằng bộ biến tần của mìnhđã đượcnhiệtđớihoá,phùhợpvớimôitrườngkhíhậuViệtNam.
+Bạnphảiđảmbảođiềukiệnmôitrườnglắpđặtnhưnhiệtđộ,độẩm,vịtrí.Cácbộbiếntầnkhông thểlàmviệcởngoàitrời,chúngcầnđượclắpđặttrongtủcókhônggianrộng,thônggiótốt(tủphảicó quạtthônggió),vịtríđặttủlànơikhôráotrongphòngcónhiệtđộnhỏhơn50oC,khôngcó+Đọckỹhướngdẫnsửdụng,nếukhônghiểuhoặckhôngchắcchắnthìkhôngtựýmắcnốihoặc thayđổicácthamsốthiếtđặt.
+Nhờcácchuyêngiakỹthuậtcủahãngcungcấpbiếntầnchobạnhướngdẫnlắpđặt,càiđặtđể cóđượcchếđộvậnhànhtốiưuchoứngdụngcủabạn.
+Khibiếntầnbáolỗihãytracứumãlỗitrongtàiliệuvàtìmhiểunguyênnhângâylỗi,chỉkhinào khắcphụcđượclỗimớikhởiđộnglại.
+Mỗibộbiếntầnđềucómộtcuốntàiliệutracứunhanh,bạnnênghichépchitiếtcácthôngsố đãthayđổivàcáclỗimàbạnquansátđượcvàocuốntàiliệunày,đâylàcácthôngtinrấtquantrọngcho cácchuyêngiakhikhắcphụcsựcốchobạn.
Cuốicùng,ngàynaybộbiếntầnkhôngcònlàmộtthứxaxỉtốnkémchỉdànhchonhữngngườicó tiền, những tiện ích mà bộ biến tần mang lại cho bạn nhiều hơn rất nhiều so với chi phí bạn phảitrả, nênbạnđừngngầnngạiđầutưmuabiếntầnchocáchệtruyềnđộngcủabạncóthểứngdụngđượcbiến tần.Đólàmộtsựđầutưđúngđắn,mộtchiếnlượcđầutưtổngthểvàdàihạn.
The inverter is a device that changed frequency electric current to the coil placed inside the engine and through which can control the motor speed stepless way, do not use the mechanical gearbox.
We have the formula for speed 3-phase AC motors are as follows:
To change the speed of the engine we have 3 methods:
Change the number of motor poles P.
Changing the slip s.
And changing the frequency f of the input voltage. And Inverter is a device used to change the frequency of the supply of 3-phase alternating current to the motor which change according to the engine speed above formula.
The principle of operation of the Inverter:
Phase AC power source 1 or 3 phase power rectifier and filter into one-way flat. This step is performed by diode bridge rectifier and a capacitor. Thus, the power factor of the inverter system cosphi are valid regardless of the load and is worth at least 0.96
Internal circuit diagram of Inverter
DC voltage above will be modified (Inverter) into 3-phase AC voltage symmetry. Initial DC voltage is generated will be stored in the capacitor rig.
Next, through the activation sequence opens IGBT (bipolar transistors with insulated gate) of the Inverter will create a three-phase AC voltage by means of pulse width modulation (PWM).
Thanks to the technological advancement of microprocessor and semiconductor technologies currently power, switching frequency pulses can reach ultrasonic frequency range to reduce the engine noise and reduce losses in the iron core motors.
Principle circuit diagram Inverter motivation
System 3-phase AC voltage at the output can change the value amplitude and frequency depending on the controller level (the need to increase or decrease the speed of the engine). In theory, between frequency and voltage with a certain rule, depending on the control mode. For constant torque load, making the voltage - the frequency is constant.
Power conversion efficiency of the inverter is very high because of the use of power semiconductor components are manufactured according to modern technologies. Thus, power consumption is approximately equal energy required by the system.
In addition, today's inverter has integrated a lot of different styles suitable controls most of the different load types. Today inverter integrated PID and suitable for many different communication standards, very suitable for the control and monitoring of SCADA systems.
The basic parts of the Inverter:
Anatomy of Inverter include input rectifier, inverter blocks and controls.
3.1. Rectifier (diode):
Rectifier diode bridge rectifier is similar to commonly found in power supplies, including AC voltage is converted into DC. After the rectifier voltage across platforms voltage filter capacitor to have a flat, stable (DC Bus) to provide power to the IGBT.
3.2. Inverter (IGBT):
Fast IGBT switching devices and high performance. In controlled IGBT Inverter click to open in sequence to generate pulses with different widths from stable DC voltage stored in the capacitor.
By using a modulation method PWM, IGBT can be enabled in the order to open the output format is the same as similar to sine song.
PWM can be used to generate output for parallel motors with sinusoidal identical. This signal is used to control the speed and torque of the engine.
3.3. Controls:
The control will be connected to peripheral circuits receive signals into the main IC controller Inverter configuration and user settings.
- IC chính để xử lý thông tin và điều khiển hoạt động của Biến Tần.
- Ngõ vào Analog: nhận tín hiệu điện áp từ 0-10V.
- Ngõ vào số: để kích hoạt cho Biến Tần chạy.
- Ngõ ra Analog: kết nối với thiết bị ngoại vi khác để giám sát hoạt động của Biến Tần.
- Ngõ ra số: xuất tín hiệu chạy hoặc cảnh báo.
The accessories of Inverter
4.1. Ministry AC resistance (AC Reactor):
AC reactor is a coil is wrapped around the steel core. Helps reduce harmonic distortion, ie noise reduction on the AC input. In addition, AC reactor reduces peak amplitude input thorns, but visibly reduced DC Bus will help stabilize and increase longevity.
AC reactor can act as a filter to the rectifier circuit input protection from noise and harmonics caused by enabling or disabling the other inductive loads.
4.2. Reactors A (DC Reactor):
When mounted reactor Inverter DC to DC power bus will be stable, large energy reserves against changes in voltage input portion of IGBT Inverter when raising resources for full load operation.
In addition, one-dimensional reactor will return to the source noise reduction caused by the Inverter.
4.3. Braking resistor (Braking Resistor):
Typically variable frequency motor drive running, stopping or braking when the motor is then converted into motor with large power generators. Usually Inverter will control the timing of the engine brake is not reasonable to happen overload. If the request is urgent, the engine stops this energy must be consumed less.
And electric brake support helps Inverter that energy consumption. Variable resistors into heat energy.
Without braking resistor, each deceleration, the inverter can be caused by over-voltage error on the DC bus.
Inverter applications in industry:
A special feature of the drive powertrains - engines that you can adjust motor speed stepless. Ie by adjusting the frequency you can adjust the engine speed changes desired in a wide range.
Use the inverter semiconductor, flexible engine automatically identifies; control features via a network; can set 16 speed levels; control lines to help start the engine startup process smoothly (soft) advanced mechanical structural strength; minimize the cost of installation, maintenance; saving installation space; the energy-saving mode, ...
You will no longer worries about not being employed, controlled energy transmission process because from now you can control it via the mode overload protection, over temperature, over current, too voltage, low voltage, phase loss error, phase difference, ... of the inverter.
Inverters are used Wray in industrial applications such as: Elevators, conveyors, cranes, boilers, pumps, packaging machines, textile machines, spinning machines, plastic injection machines ...
Notes on using the Inverter:
+Tùy theo ứng dụng mà bạn lựa chọn bộ biến tần cho phù hợp,theo cách đó bạn sẽ chỉ phải trả một chi phí thấp mà lại đảm bảo độ tin cậy làm việc.
+Bên trong bộ biến tần là các linh kiện điện tử bán dẫn nên rất nhạy cảm với điều kiện môi trường, mà Việt Nam có khí hậu nóng ẩm nên khi lựa chọn bạn phải chắc chắn rằng bộ biến tần của mìnhđã đượcnhiệtđớihoá,phùhợpvớimôitrườngkhíhậuViệtNam.
+Bạnphảiđảmbảođiềukiệnmôitrườnglắpđặtnhưnhiệtđộ,độẩm,vịtrí.Cácbộbiếntầnkhông thểlàmviệcởngoàitrời,chúngcầnđượclắpđặttrongtủcókhônggianrộng,thônggiótốt(tủphảicó quạtthônggió),vịtríđặttủlànơikhôráotrongphòngcónhiệtđộnhỏhơn50oC,khôngcó+Đọckỹhướngdẫnsửdụng,nếukhônghiểuhoặckhôngchắcchắnthìkhôngtựýmắcnốihoặc thayđổicácthamsốthiếtđặt.
+Nhờcácchuyêngiakỹthuậtcủahãngcungcấpbiếntầnchobạnhướngdẫnlắpđặt,càiđặtđể cóđượcchếđộvậnhànhtốiưuchoứngdụngcủabạn.
+Khibiếntầnbáolỗihãytracứumãlỗitrongtàiliệuvàtìmhiểunguyênnhângâylỗi,chỉkhinào khắcphụcđượclỗimớikhởiđộnglại.
+Mỗibộbiếntầnđềucómộtcuốntàiliệutracứunhanh,bạnnênghichépchitiếtcácthôngsố đãthayđổivàcáclỗimàbạnquansátđượcvàocuốntàiliệunày,đâylàcácthôngtinrấtquantrọngcho cácchuyêngiakhikhắcphụcsựcốchobạn.
Cuốicùng,ngàynaybộbiếntầnkhôngcònlàmộtthứxaxỉtốnkémchỉdànhchonhữngngườicó tiền, những tiện ích mà bộ biến tần mang lại cho bạn nhiều hơn rất nhiều so với chi phí bạn phảitrả, nênbạnđừngngầnngạiđầutưmuabiếntầnchocáchệtruyềnđộngcủabạncóthểứngdụngđượcbiến tần.Đólàmộtsựđầutưđúngđắn,mộtchiếnlượcđầutưtổngthểvàdàihạn.
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