Low Power Input 220V Single Phase Output 220V 3Phase AC Vector VFD Variable Frequency Drive
A low-power input 220V single-phase to 220V three-phase AC vector variable frequency drive (VFD) is a device that converts single-phase AC power into three-phase AC power and can adjust the output frequency and voltage. It is suitable for driving three-phase AC motors, particularly in scenarios where three-phase power is unavailable but three-phase motors are required. Below is a detailed explanation covering its technical principles, product features, selection recommendations, application scenarios, and precautions.
I. Technical Principles
- Rectification Stage : Converts single-phase 220V AC power into DC power through a rectifier bridge.
- Filtering Stage : Uses capacitors or inductors to filter the DC power, obtaining a stable DC voltage.
- Inversion Stage : Utilizes power devices such as IGBTs (Insulated Gate Bipolar Transistors) to convert the DC power into three-phase 220V AC power, controlling the output voltage and frequency through PWM (Pulse Width Modulation) technology.
- Vector Control : Achieves precise control of motor torque and speed by decoupling the torque and flux components of the motor current.
II. Product Features
- Wide Input Voltage Range : Supports input voltage fluctuations of ±15% or ±20% around single-phase 220V, adapting to different grid environments.
- Adjustable Output Voltage : The output three-phase voltage can be adjusted within the range of 0-220V to meet the needs of different motors.
- Wide Frequency Adjustment Range : The output frequency range typically spans from 0-400Hz or 0-600Hz, enabling stepless speed regulation of motors.
- Vector Control Technology : Provides high starting torque (e.g., 150% or 180% of rated torque at 0.5Hz), a wide speed regulation range (1:100 or 1:1000), and high speed control accuracy (±0.5% or ±0.02%).
- Comprehensive Protection Functions : Equipped with protection features against overcurrent, short circuits, overtemperature, overvoltage, and undervoltage to ensure safe operation.
- User-Friendly Operation : Features a digital display panel and multifunctional input terminals, supporting parameter copying and remote monitoring.
III. Selection Recommendations
- Power Matching : The rated power of the VFD should be at least 1.5 times that of the motor. For example, when driving a 1kW motor, a VFD with a minimum power of 1.5kW should be selected. If the load is heavy (e.g., gear pumps, hydraulic pumps) or there are stall conditions, a VFD with at least twice the motor power should be chosen.
- Voltage and Frequency Range : Ensure that the input voltage range, output voltage range, and output frequency range of the VFD meet the application requirements.
- Control Mode : Select the appropriate control mode based on application needs: V/F control for simple speed regulation scenarios, non-PG vector control (SVC) for moderate performance requirements, or PG vector control (FVC) for applications demanding high starting torque and precise speed control.
IV. Application Scenarios
- Small Mechanical Equipment : Such as small CNC machine tools, woodworking machinery, and textile machinery, which typically require three-phase motor drives but may only have single-phase power available on-site.
- Pumps and Fans : Such as water pumps and fans, where precise control of flow and air volume can be achieved through variable frequency speed regulation, resulting in significant energy savings.
- Household and Commercial Equipment : Such as elevators and automatic doors, which have high requirements for starting torque and speed control accuracy.
