The variable-frequency motor, through the AC speed regulation mode of “special variable-frequency induction motor + frequency converter”, has significantly enhanced the mechanical automation level and production efficiency, achieved the miniaturization of equipment, and improved comfort. Currently, it is gradually replacing the traditional mechanical speed regulation and DC speed regulation schemes. So, what exactly are the differences between the variable-frequency motor and the ordinary motor? The specific differences are as follows:
First, in terms of the efficiency and temperature rise of the motor. In the case of variable-frequency drive, the efficiency of the variable-frequency speed regulation motor is approximately 10% higher, and the temperature rise is reduced by approximately 20%, especially in the low-frequency region of vector control or direct torque control.
Second, the insulation strength issue of the motor. Because the variable-frequency motor is specifically designed for drive by frequency converters, it can withstand a larger alternating current. Thus, the insulation strength of the variable-frequency motor is higher. Especially in the DTC control mode, it is a great test for the insulation strength of the motor.
Third, in terms of electromagnetic noise and vibration, the variable-frequency motor has lower noise and less electromagnetic vibration than the ordinary motor when driven by variable frequency.
Fourth, for occasions that require frequent starting, frequent speed adjustment, and frequent braking, the performance of variable-frequency motors is superior to that of ordinary motors.
Fifth, the most crucial difference lies in that variable-frequency motors have additional heat dissipation functions. The heat dissipation effect in low-frequency, DC braking, and some special application scenarios is far superior to that of ordinary AC asynchronous motors.