It is a variable frequency motor, then the use of the connection with the inverter, the frequency of the inverter is reduced, that is, to the motor torque compensation, in order to protect the motor must meet the U\/f= constant, so the frequency reduction voltage is also reduced.
If the voltage rises, the exciting current of the motor will increase, and the loss of the iron core will also increase, causing the motor to heat seriously and burn the motor.
Therefore, the voltage should be changed when the frequency is changed, and the voltage should be lowered when the frequency is lowered, so as to ensure that the magnetic flux of the motor is unchanged, and then the excitation current is unchanged, so as to protect the normal operation of the motor.
To better understand this knowledge, it is recommended that you buy a \"inverter principle and application\
It is a variable frequency motor, then the use of the connection with the inverter, the frequency of the inverter is reduced, that is, to the motor torque compensation, in order to protect the motor must meet the U\/f= constant, so the frequency reduction voltage is also reduced.
If the voltage rises, the exciting current of the motor will increase, and the loss of the iron core will also increase, causing the motor to heat seriously and burn the motor.
Therefore, the voltage should be changed when the frequency is changed, and the voltage should be lowered when the frequency is lowered, so as to ensure that the magnetic flux of the motor is unchanged, and then the excitation current is unchanged, so as to protect the normal operation of the motor.
To better understand this knowledge, it is recommended that you buy a \"inverter principle and application\
For constant torque load, the general frequency converter is designed in accordance with U\/f= constant value, at this time, the magnetic flux Φ basically remains unchanged, the motor torque also basically remains unchanged, with the same overload capacity before and after speed regulation. In this way, the current is basically maintained, and the voltage is basically decreased in proportion to the frequency. This is quite different from the speed regulation method of inverter for fan load.