How to control the torque of the inverter vector according to the system - Reynolds

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

A brief introduction to the progress of the inverter in terms of torque:

This function adds the output voltage of the inverter so that the output torque of the motor is proportional to the square of the voltage, so as to improve the output torque of the motor. Improve the skill of insufficient torque at low speed output of the motor, and use "vector control" to make the output torque of the motor at low speed, such as (without speed sensor) at 1Hz (for 4-pole motors, the speed is about 30r/min), reach the torque of the motor at 50Hz power supply output (the maximum torque is about 150%).

How to control the torque of the inverter vector according to the system - Reynolds

How to control the torque of the inverter vector according to the system - Reynolds

In the case of conventional V/F operation, the voltage drop of the motor increases as the speed of the motor decreases, which results in insufficient excitation and the motor cannot obtain sufficient rotational force. In order to compensate for this shortcoming, the inverter needs to pass through a progressive voltage to compensate for the voltage drop caused by the decrease in motor speed. This function of the inverter is called "torque progression" (*1).

The torque progress function is the output voltage of the progressive inverter. However, even if the output voltage is improved a lot, the torque of the motor does not correspond to the progress of its current. Since the motor current includes the torque weight generated by the motor and other weights (e.g. excitation weight). "Vector Operation" distributes the current value of the motor to determine the current weight of the motor that generates torque and the value of other current weights (such as excitation weight). "Vector control" optimally compensates for the voltage drop at the motor end, allowing the motor to generate high torque without adding current. This function is also effective in improving the temperature rise of the motor at low speeds.

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