ZFeng 900 Series 110Kw-T-G General Vector Variable Frequency Drive Working Principle - Rectification process: The frequency converter first converts the input AC power (usually
50Hz or 60Hz power frequency) into DC power through a rectifier.
This process utilizes the unidirectional conductivity of rectifier
diodes.
- Filtering process: The rectified DC power may contain pulsating components, so it
needs to be smoothed through a filtering circuit to remove the
pulsation in the power supply and obtain a stable DC power supply.
- Inverter stage: The filtered DC power is then converted into AC power with
adjustable frequency and voltage through an inverter. The inverter
is mainly composed of IGBT (Insulated Gate Bipolar Transistor),
which can achieve precise control of the output power frequency and
voltage by controlling the switching state of IGBT.
- Control circuit: The control circuit is the core part of the frequency converter,
including the main control circuit, signal detection circuit, drive
circuit, external interface circuit, and protection circuit. It is
responsible for receiving external instructions, detecting the
operating status of the motor, and outputting control signals to
the inverter based on this information to achieve precise control
of the motor.
FEATURES - Vector control technology: Vector control technology is an advanced motor control method that
can decompose the stator current of the motor into two components:
excitation current and torque current, and control them separately.
This technology can achieve high-precision speed regulation and
fast response of motors.
- Direct Torque Control (DTC): DTC technology directly analyzes the mathematical model of an AC
motor in the stator coordinate system, while controlling the
motor's magnetic flux and torque. It abandons the complex
calculations in vector control and has faster response speed and
higher control accuracy.
- Matrix AC-AC frequency conversion: Matrix AC-AC frequency conversion technology eliminates the
intermediate DC link and directly converts AC power to AC power
through frequency conversion. It has the advantages of a power
factor of 1, a sine input current, and the ability to operate in
four quadrants.
Application Frequency converters are widely used in various industries such as
power, public works, textiles and chemical fibers, building
materials, petroleum, chemical, food and beverage, tobacco, coal,
and mechanical processing. In these industries, frequency
converters play an important role in energy-saving speed
regulation, torque control, position control, etc., providing
strong support for the production efficiency and energy utilization
efficiency of enterprises.
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