Inverters are mainly divided into two categories according to the frequency conversion method: communication/DC/communication and communication/communication inverters. COMMUNICATION/DC/AC inverter, also known as direct inverter, refers to the operation, first converting the 50Hz power frequency communication power into pulsating DC through the rectifier module unit, and then filtering through the capacitor in the intermediate circuit circuit to become a relatively smooth DC power supply to provide power supply energy for the IGBT inverter module. The turn-on and cut-off frequencies of these IGBT modules are controlled by the IC main control board chip system, and at this moment, the inverter module circuit converts the high-voltage DC power supply into a communication power with harmonic frequency and variable voltage, and then provides a three-phase asynchronous motor with a communication load for inverter control.
Because the primary element equipment selected internally is semiconductor equipment, and these components inevitably present many artificial and other elements in the process of use, simply forming the damage of the inverter, and the damage of the three-phase motor for the second time, so the engineers have planned a simple signal detection and sampling circuit in the electronic circuit to monitor the working status of the inverter in real timeThe work will be stopped, and the fault phenomenon and fault location will be displayed on the LED display, and people will check and repair according to the fault code, and restart the inverter after eliminating the fault. In the internal control of the general inverter, the parking and braking methods can be controlled by the inverter, and the general inverter has a variety of shutdown methods and braking methods to set or choose, such as deceleration stop, free shutdown, deceleration shutdown + braking, etc., so that the impact of the inverter on the motor and mechanical parts is not reduced, and then the whole system is more safe and reliable.
In fact, there are many maintenance circuits inside the inverter, but because the user does not involve some phenomena, it is not studied in detail. The internal maintenance of the inverter can realize the maintenance function of various abnormal phenomena of the inverter itself and the load motor, which mainly includes overheating (overload) maintenance and stall avoidance maintenance.
(1) Overheating (overload) maintenance function: The overheating (overload) maintenance of the inverter is overcurrent maintenance or overheating maintenance, and all inverters are equipped with electronic thermal maintenance functions or thermal relays for maintenance. When the load inertia controlled by the inverter is too large or the motor stalls due to excessive load, the output current exceeds the rated value or communicates that the motor is overheated, and the maintenance circuit action is to stop the motor and avoid damage to the inverter and the load motor.
(2) Avoid stall maintenance: Stall means that when the acceleration time of a given motor of the inverter is too short, and the acceleration change of the motor is far from keeping up with the output frequency change of the inverter, the inverter will trip due to excessive current and stop working. In order to avoid the above-mentioned stall phenomenon and make the motor work normally, the inverter is provided with a stall avoidance maintenance circuit, which can detect the size of its output current and carry out comparison operation to carry out the active adjustment and control of the frequency. When the acceleration current is too large, the acceleration frequency is appropriately idle, and when the deceleration current is too large, the acceleration frequency is also appropriately idle to avoid stalling.
Now the vector inverter can also adjust the torque of the motor, so that it can be set inside the inverter, the motor and mechanical equipment can be maintained from damage, and then ensure the continuity of the normal operation of the mechanical equipment driven by the inverter and the reliability of the product.
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