Do you know the principle and control strategy of motor ramp voltage starting and current limiting starting?

Do you know the principle and control strategy of motor ramp voltage starting and current limiting starting?

In the starting mode of the motor, there are many starting modes to choose from, but no matter what kind of starting mode is used to better protect the motor and reduce the damage to the motor. Today, let's see what happens when the ramp voltage starts. What is his working principle?

First, the principle and control strategy of ramp voltage starting

1 ramp voltage starting principle

When the ramp voltage starts, the stator terminal voltage of the motor gradually increases linearly, so the driving torque generated by the motor also gradually increases. As the voltage increases, the driving torque also increases. When the driving torque is greater than the damping torque and load. When the torque is summed, the motor starts to start and eventually reaches stable operation.

At present, China's national standard stipulates that the overload capacity of the asynchronous motor is Tmax/Tn>1.8, that is, under the premise that the motor drives the rated torque without stopping, the voltage accounts for about 74.5% of the rated voltage.

2 slope start control strategy

The dual-control is applied to the ramping voltage of the motor. On the one hand, when the soft-start current is lower than the set maximum current value, the firing angle changes according to the predetermined change rule. Second, if the starting current during soft-start is greater than the setting When the maximum current value is set, the PI regulation link is put into operation, and the current is further increased. However, when the current is adjusted to be less than the set maximum current value, the PI regulator exits the system until the start is completed.

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