If the speed of a normal motor is adjusted by the frequency converter, the speed can exceed the rated speed, and if the current power is above the rated speed, what is the change in current power
Motor frequency control of motor speed and load, control system, closed loop control, open loop control, independent motor), which has no books can be used for direct access to information, because of the complexity of the situation. The output of the motor is lower than the rated speed, and the output of the motor is the output of the fixed torque. If, in the closed-loop control in main motor dynamic adjustment target rotation speed and torque of the motor, under the condition of the motor can meet the maximum load power, if be uniform, drag the project target motor with the higher level or lower level of drag torque is the same, and the final output linear velocity is given priority to with the main motor to work machine, tend to be the same.
When the torque is greater than the load, the frequency can reach the limit, higher than the constant power characteristic, and the real-time current is not overrated. The change of motor is just a consideration of the torque
It can exceed the rated speed, but it is best not to be too much, the main fear is that the bearing and rotor will not bear the high speed. The motor exceeds the rated speed, the output of the motor is constant, but the torque decreases. Can you continue to drag your load, depending on whether your load is constant or constant torque,
General motor frequency control of motor speed can exceed the rated speed, with the increase of the frequency of the motor voltage is reduced, this is the V/F converter control function, so it won't burn motor! But it depends on whether your load is matched by the power of the motor, because no matter how much the motor speed increases the power of the motor is inconvenient! Can change big motor to solve problem! The best frequency of a general frequency converter is 400HZ motor frequency to 100HZ, which is no problem. It will only accelerate the wear and tear of the motor and the equipment without any benefit!
As the speed increases, the output torque decreases as the speed increases. So the maximum speed is to limit the load. If increasing the motor power, can continue to improve, but increase the proportion of the severely reduced, transmission efficiency have fallen sharply, various losses rapidly rising, and need higher power converter. It should not be more than 100Hz. Too much speed is not good for a transmission system. The limit of the high frequency converter can be increased by 400HZ
