The specific operation method of Delta inverter

Create Date: 2024-8-30 12:03:23|Source: Delta/Delta

(1) When the speed of the motor is controlled by the Delta inverter, the noise and temperature rise of the motor are higher than that of the frequency of the motor. When the motor is working at low speed, due to the low speed of the motor blades, the temperature rise of the motor becomes high, in this case, it is necessary to pay attention to the appropriate load reduction and ventilation and cooling to prevent the temperature rise of the motor from exceeding the maximum limit.

(2) The impedance of the power supply line should be appropriately increased, in the case of the inverter connected to the low-voltage power grid, if the inverter and the distribution transformer are very close to each other, perhaps the capacity of the distribution transformer is about 10 times greater than the capacity of the inverter, if the loop impedance is too small, a large inrush current will occur to the Delta inverter at the moment of investment, and the rectifier element of the inverter will be directly damaged. Therefore, if the resistance is small, an AC reactor should be installed between the transformer and the inverter.

The specific operation method of Delta inverter

The specific operation method of Delta inverter

Delta's inverter is as follows:

1. Control the stator flux to introduce the stator flux observer to complete the speed sensorless method.

2. Automatic identification (ID) relies on accurate motor mathematical model to automatically identify motor parameters.

3. Calculate the practical value corresponding to the stator impedance, mutual inductance, magnetic saturation element, inertia, etc., and calculate the practical torque, stator flux, and rotor speed for real-time control.

4. Complete the Band-Band control and generate the PWM signal according to the Band-Band control of the flux and torque, and control the switching state of the inverter.

Delta's matrix AC-AC frequency converter has fast torque response (<2ms), high speed accuracy (±2%, no PG reaction), and high torque accuracy (<+3%). Together, it also has high starting torque and high torque accuracy, especially at low speed (including 0 speed), it can output 150%-200% torque.

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