1. From the power frequency point of view, frequency conversion motor is inferior motor, ordinary motor is good motor;

2. Because the PWM width modulation wave output by the frequency converter simulates the sinusoidal alternating current, it contains a lot of harmonics, so it can enter the ordinary motor after filtering by the reactor, otherwise the ordinary motor will heat up;

3. In order to adapt to the PWM width modulation wave output from the frequency converter and simulate the sinusoidal alternating current containing a large number of harmonics, the specially made variable frequency motor can actually be understood as reactor plus ordinary motor;

4. That is to say, the same power inverter motor core cross-section than ordinary motor, more coil turns, larger wire diameter, higher insulation, special cooling fan motor;

5. In order to meet the needs of flux weakening speed regulation, the bearing capacity of bearing and dynamic balance of high-speed rotor are considered;

6. This kind of variable frequency motor does not have better torque characteristics, but overcomes the need that ordinary motor can't meet the need of simulating sinusoidal alternating current with PWM width modulation wave!

7. If the variable frequency motor does not have the above characteristics and requirements, it is a false variable frequency motor, the previous one returns to the next one