Variable Frequency Drives (Inverters) are power electronic devices that play a crucial role in controlling electric motors. Variable Frequency Drives convert electrical energy into mechanical energy, providing stable operation, energy savings, and extended system lifespan.
These devices are commonly used to control the speed and torque of motors, optimizing operational efficiency and saving energy in various industrial and domestic applications. Variable Frequency Drives play an important role in automation systems, offering flexible control capabilities for electrical equipment.
Overview of Invt Variable Frequency Drive
Structure of Variable Frequency Drives
Main Components
Rectifier: Converts AC voltage into DC.
Filter: Smooths DC voltage to stabilize the power supply.
IGBT Inverter: Converts DC voltage into AC with variable frequency and amplitude.
Control circuit: Manages and coordinates the operation of other components.
Additional Components
AC Reactor: Helps regulate current and protect equipment.
DC Reactor: Assists in the voltage conversion process.
Braking resistor (discharge resistor): Helps absorb excess energy and decelerate the motor when needed.
Keypad: Allows users to operate and adjust parameters.
Display screen: Provides information about the operating status of the Variable Frequency Drive.
Communication module: Enables connection and communication with other devices or management systems.
Siemens Variable Frequency Drive Structure
Variable Frequency Drive Classifications
Classification by Brand
ABB Variable Frequency Drives
Origin: Switzerland – Sweden
Key Features: A global brand known for reliability and performance. ABB Variable Frequency Drives stand out with advanced control technology, efficient energy conversion capabilities, diverse models, and integrated comprehensive motor protection functions.
Power Classification: Includes ABB Variable Frequency Drives below 10kW (suitable for small machinery, domestic use) and ABB Variable Frequency Drives above 10kW (ideal for large industrial systems).
ABB Variable Frequency Drive
Schneider Variable Frequency Drives
Origin: France
Key Features: Schneider Electric provides leading energy management and automation solutions. Schneider Variable Frequency Drives are known for advanced technology, stable operation, easy installation, and high compatibility with various systems, delivering optimal performance.
Power Classification: Includes Schneider Variable Frequency Drives below 10kW (for small and medium applications) and Schneider Variable Frequency Drives above 10kW (for heavy industrial loads).
Schneider Variable Frequency Drive
Mitsubishi Variable Frequency Drives
Origin: Japan
Key Features: Mitsubishi Variable Frequency Drives are renowned for their outstanding durability, stability, and precise control capabilities. Products from this Japanese brand are easy to program and integrate multiple protection features, suitable for manufacturing plants and industrial production lines.
Power Classification: Includes Mitsubishi Variable Frequency Drives below 10kW (for domestic machinery, light industry) and Mitsubishi Variable Frequency Drives above 10kW (for factories, large production lines).
Mitsubishi Variable Frequency Drive
Fuji Variable Frequency Drives
Origin: Japan
Key Features: Fuji Variable Frequency Drives are reliable solutions with high performance and stable operation. Their compact design, long lifespan, and wide compatibility make Fuji Variable Frequency Drives applicable in many fields, from precise motor control to heavy industrial loads.
Power Classification: Includes Fuji Variable Frequency Drives below 10kW (for small machinery, domestic use) and Fuji Variable Frequency Drives above 10kW (for heavy industrial applications, large loads).
Fuji Variable Frequency Drive
Invt Variable Frequency Drives
Origin: China
Key Features: Invt Variable Frequency Drives offer a balance between stable performance and competitive pricing. The products come in diverse models, are easy to install and maintain, operate stably, and meet the requirements of both light and heavy industry well.
Power Classification: Includes Invt Variable Frequency Drives below 10kW (suitable for small machinery, domestic use) and Invt Variable Frequency Drives above 10kW (for factories, large production lines).
Invt Variable Frequency Drive
Delta Variable Frequency Drives
Origin: Taiwan
Key Features: Delta Variable Frequency Drives are known for their high reliability, durability, and compact design. The products integrate many smart features, providing precise control capabilities and excellent technical support, ideal for diverse industrial applications.
Power Classification: Includes Delta Variable Frequency Drives below 10kW (for domestic machinery, light industry) and Delta Variable Frequency Drives above 10kW (for factories, large production lines).
Delta Variable Frequency Drive
Siemens Variable Frequency Drives
Origin: Germany
Key Features: Siemens Variable Frequency Drives are a symbol of German automation technology, excelling in high precision, superior energy efficiency, and absolute operational durability. They are easy to integrate into large systems.
Power Classification: Includes Siemens Variable Frequency Drives below 10kW (for small machinery, domestic use) and Siemens Variable Frequency Drives above 10kW (for heavy industrial applications, large loads).
Siemens Variable Frequency Drive
Classification by Power
Variable Frequency Drives below 10kW
Features: The group of Variable Frequency Drives below 10kW are small in power, ideal for domestic equipment and light industry. Key advantages include compact size, optimized energy savings for small loads, and easy installation.
Classification by Brand: Includes models from ABB, Schneider, Mitsubishi, Fuji, Invt, Delta, Siemens.
Variable Frequency Drives above 10kW
Features: Used for heavy industrial applications requiring high torque and continuous operation. Variable Frequency Drives above 10kW have high power, stable operation for heavy loads, optimized energy savings for large-scale systems, and integrate many advanced control features.
Classification by Brand: Includes models from ABB, Schneider, Mitsubishi, Fuji, Invt, Delta, Siemens.
Latest Price List for Variable Frequency Drives at Thanh Thai Motor
ABB Variable Frequency Drives Price List
The price list for this European Variable Frequency Drive series is classified by specialized models. The pricing reflects high durability, superior energy saving capabilities, and smart motor protection features integrated into the controller.
The pricing for this Japanese brand is based on its ability to withstand harsh loads and long-term stability. The price list focuses on popular models with costs varying by power level and the ability to integrate communication modules.
The price list for Mitsubishi Variable Frequency Drives reflects high-quality components and excellent compatibility with automation systems. Costs are clearly categorized from compact models to high-performance specialized models for large production lines.
This product line offers extremely competitive prices across various segments from budget-friendly to mid-range. The price list is optimized for many different applications such as packaging machines, fans, and pumps, making it easy for customers to choose a model that fits their budget.
The price list is categorized by versatile models such as GD20, GD200A, effectively meeting the needs of manufacturing workshops and basic control applications.
The price list for Siemens Variable Frequency Drives is based on strict German technical standards, focusing on durability and advanced automation system integration capabilities. Costs vary depending on the power module configuration and accompanying industrial communication standards.
The price list for Schneider Variable Frequency Drives features modern design and user-friendly interfaces. Investment costs depend on the level of integration of drive standards and heat resistance capabilities in large industrial electrical cabinets.
Variable Frequency Drive Price Quote Video 10/2026 - Thanh Thai Motor
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Notes When Purchasing Variable Frequency Drives
Determine load type: Choose heavy-duty Variable Frequency Drives (G-series) for constant torque applications such as conveyors, air compressors; or light-duty Variable Frequency Drives (P-series) for pumps, fans to optimize costs.
Rated current (Amps): Prioritize selecting Variable Frequency Drives based on the current (A) indicated on the motor’s nameplate rather than just the power (kW) to ensure it doesn’t overload during operation.
Input voltage: Carefully check whether the power supply at your workshop is 1-phase 220V, 3-phase 220V, or 3-phase 380V to select the model with the corresponding input voltage.
Control mode: Choose between V/f control for simple applications or Vector control when high torque is needed at low speeds or for strict position accuracy.
Operating environment: Evaluate the humidity, dust, and temperature of the installation location to select Variable Frequency Drives with an appropriate IP rating or equip them with specialized cooling cabinets.
Expandability and communication: Ensure the Variable Frequency Drive supports necessary connection ports (such as RS485, Modbus) if your system requires centralized control via PLC or HMI.
Protective accessories: Consider purchasing a braking resistor (for lifting/quick stopping loads) or a reactor (if cables are long or the power grid is unstable) to protect the equipment for a longer lifespan.
Frequently Asked Questions
Why do Variable Frequency Drives often report an over-temperature (OH) error and how to quickly resolve it?
OH errors are often caused by a faulty cooling fan, prolonged dust accumulation, or Variable Frequency Drives being installed in an excessively confined electrical cabinet. You need to clean the dust filter, check the fan, and ensure the installation distance between Variable Frequency Drives meets technical standards (usually at least 5cm apart) for optimal air circulation.
Do Variable Frequency Drives help save energy for motors?
Yes, especially effectively with loads such as water pumps or fans. Variable Frequency Drives help adjust motor speed to match actual demand instead of running at 100% maximum power. Additionally, the soft-start function of Variable Frequency Drives helps reduce starting current, prevent grid voltage drops, and protect the mechanical structure of the machine.
What is the maximum installation distance between a Variable Frequency Drive and a motor?
The standard safe distance is below 30m. Typically, if the cable length exceeds 30-50m, voltage drop and harmonic distortion will occur, easily causing motor burnout or Variable Frequency Drive damage. In cases where long-distance installation is unavoidable, you need to install additional reactors or EMI filters at the output to protect the motor windings.
