The development power of frequency conversion technology is its broad market potential. At present, the price of AC drive and DC speed control device of the same capacity is close, and it has become an inevitable trend that AC frequency conversion adjustment device replaces DC speed control device. Simply put, the frequency converter is a device that rectifies the alternating current into a direct current voltage and then inverts it into an alternating current. This inverter process is the core technology of the inverter. The AC voltage and frequency output through the inverter can be adjusted according to different needs.
The frequency converter is composed of two main parts: the main circuit and the control circuit. The main circuit consists of three main components: rectifier, filter and inverter. The control loop is composed of a single chip microcomputer, a driving circuit and an optical isolation circuit. When the inverter is running, the frequency of the power supply can be changed to realize the speed control of the asynchronous motor. In addition to meeting the variable frequency conditions, the inverter power supply also considers the functions of effectively utilizing the motor excitation suppression start current and obtaining the ideal torque characteristics.
The lifting equipment, horizontal traction equipment, processing equipment and devices commonly used in construction are widely used. Three-phase asynchronous motors that are not easy to maintain, but are difficult to adjust, have large starting currents and cause great impact on the power grid. The installed capacity of the self-supplied generator is insufficient, which affects the start-up situation, and these construction equipment are often in frequent starting and stopping operations. It is often the case that sports equipment is unstable due to start and stop, resulting in large dynamic load impacts on mechanical equipment, affecting mechanical hardware and safety production operations that endanger personnel. When a shifting mechanism must be used to adapt to different loads, conventional shifting devices such as shifting couplings, DC motors, wound rotor asynchronous motors, etc. are often used. These products have different degrees of defects and deficiencies, which are difficult to adapt. Today's efficient, energy-efficient, safe and reliable requirements.
The frequency conversion speed regulation can directly carry out the stepless speed regulation of the most commonly used cage three-phase asynchronous motor, the speed regulation range is wide, the starting current is small, the requirements on the power grid are low, the motor can be miniaturized and high-speed, and the low speed can be realized. The torque output can adjust the speed of acceleration or deceleration, and the working efficiency can be greatly improved. A more advanced application is the ability to adjust the output characteristics and adjust the working range of the hardware quickly and easily by programming or software.
With the advancement of science and technology, the performance and power of the inverter are constantly improving. What is more favorable is that the price has been reduced to the original speed control system. At present, the use of frequency converter speed control on some production machines has become A sign of these mechanical renewals. In recent years, frequency converters have been developing at various speeds in various industries. Construction companies have rarely used them in this respect. Even few people know that their use is closely related to their own construction and production.
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