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Output of the variable frequency drive has the voltage detection function, and the VFD can automatically adjust the output voltage, so as to ensure the motor not to withstand over voltage. Even if the output voltage adjustment fails and the output voltage exceeds 110% of the normal voltage, the VFD will protect the motor by stopping the machine.
When the motor voltage is below 90% of the normal voltage, the VFD shuts down for protection.
The motor acceleration dω/dt depends on the acceleration torque, but the frequency change rate of VFD in starting and braking process is set according to the requirements of frequency conversion speed control system.
Changing frequency can change the motor speed. For example, the speed of a four-pole motor is 1500 rpm at the frequency of 50Hz, but it changes to 1800 rpm when the frequency is changed to 60 Hz, so the lower the frequency, the lower the speed.
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