What is the difference between a variable frequency motor and a normal motor?
There are three main differences between variable frequency motors and ordinary motors.
1. The heat dissipation system is different; the cooling fan in the common fan uses the same line as the fan movement, and the two in the variable frequency motor are separate. Therefore, when the inverter frequency is too low, it may burn out due to overheating.
2. Because the frequency conversion motor has to bear the high frequency magnetic field, the insulation level is higher than that of the ordinary motor. In principle, the ordinary motor can not be driven by the frequency converter, but in practice, in order to save money, it is used in many occasions requiring speed regulation. Ordinary motors replace variable frequency motors, but the accuracy of ordinary motors is not high. This is often done in the energy-saving retrofit of fans and pumps. When using a normal motor instead of a variable frequency motor, the carrier frequency of the inverter should be as low as possible to reduce the insulation damage of the motor at high frequencies. The variable frequency motor enhances the slot insulation. First, the insulation material is strengthened. First, the thickness of the slot insulation is increased to increase the level of high frequency voltage.
3. Increased electromagnetic load. The working point of the ordinary motor is basically at the magnetic saturation inflection point. If it is used for frequency conversion, it is easy to saturate and generate a high excitation current, and the variable frequency motor increases the electromagnetic load during design, making the magnetic circuit difficult to saturate. In addition, the variable frequency motor is generally divided into a constant torque dedicated motor, which is used for a dedicated motor with a speed vector and a medium frequency motor with feedback vector control.
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