1. What is a self-learning motor of inverter?
Enter the motor nameplate (voltage, current, Hz rating) in the inverter parameters, and then the inverter actively measures other parameters of the motor.
Second, why does the inverter need to learn the motor?
The control method is different, and the principle of self-learning is also different. For example, DTC control, is the most advanced vector control method of the inverter, is an advanced motor control method, which directly controls the key variables of the motor: magnetic flux and torque, in the inverter, a software mathematical model of AC asynchronous motor is established, the measured motor voltage, current, converted into a set of accurate motor torque and magnetic flux actual values, and these parameters are directly used to control the switching state of the output unit. The inverter injects a voltage/current signal of a certain frequency and amplitude into the winding of the motor, and then detects some electrical information reflected by the motor online, so as to calculate the model parameters of the motor to identify and identify the motor.
Self-learning has three components
The first part is called static identification and optimization of motors. In this process, the motor is not electrified, and only through the input motor nameplate data, the inverter establishes the mathematical model of the equivalent circuit of the motor.
In the second part, called the dynamic identification and optimization of the motor, in this process, the inverter needs to start the motor to flow current, and the inverter accurately calculates and determines the parameters in the equivalent circuit of the motor. If it is vector control, the next step is to do the recognition of the magnetization curve of the motor and draw the relevant parameters of the magnetization curve. This operation requires the inverter to be started, and the motor flows through the current;
The third part is called the regulator optimization to start the inverter motor rotation to determine and count the moment of inertia of the motor, the regulator gain, and the integration time.
If the first step of the above three processes is not done, the inverter will not be able to operate. If you don't do the second step, the motor will not run normally, and the fault will be reported; In the third step, the motor can be operated, but the speed and current will fluctuate during operation.
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