Is the washing machine variable frequency motor good?

Update:10 Feb 2020
Summary:

Brushless DC motors are DC motors and are in principle […]

Brushless DC motors are DC motors and are in principle the same as those with brushes. The difference is that brushless uses magnetic sensors instead of brushes to detect the magnetic pole position of the rotor. 2. Inverter motor, there is actually no such thing. This is a wrong term! The motor itself has no inverter function. "Frequency inverter" is a copy of advertising by the business. Directly proportional. 3. The frequency conversion function is generated by the frequency converter, which can realize stepless speed regulation of the motor! 4. As long as it is a big-name washing machine, it uses a DC brushless motor! In order to attract consumers, it will be written as a DC brushless inverter motor!