Motor performance selection requires consideration of electric motor power, rated voltage, and torque.
The size of the torque is directly related to the speed of the induction motor for the same power motor.
For motors with the same rated power, a higher rated speed results in a smaller size, weight, and cost of the industrial motor.
In addition, the efficiency of the high-speed motor is relatively high, making it more economically viable.
However, the allowed rotation speed range of the equipment being driven must also be taken into account.
If the motor speed is higher than the equipment speed, it cannot be driven directly and must be changed through the necessary speed reduction facilities.
The larger the speed difference, the more complicated the speed change facilities may become.
Therefore, the speed of the matched electric motor should consider both the ac motor body and the equipment being driven.
For operating conditions where the electric motor works continuously and rarely starts, brakes, or reverses, factors such as equipment and facility investment, and later maintenance should be compared.
Different rated speeds can be selected and combined with the variable speed system for a comprehensive comparison to determine the appropriate speed transmission ratio and rated speed of the induction motor from the aspects of economy, reasonableness, and reliability.
For frequent starting, braking, and forward and reverse operation but not long-term work, the transition process should be focused on according to the principle of less energy loss.
The speed transfer ratio and rated speed of the motor should be selected accordingly.
For the condition of frequent starting and braking, forward and reverse rotation, and high operation efficiency requirements, the transition time should be strictly controlled.
The induction motor speed can be selected based on the principle of minimum value of GD2.ne2 which is proportional to the kinetic energy storage of the system and speed transmission ratio.
