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The answer is negative. In fact, not all three-phase motors can be speed controlled using frequency converters. Only the following three-phase motor types can use frequency converters:

1. Non-induction motors: such as DC motors, stepper motors, etc.

2. Induction motor: such as asynchronous motor, wound synchronous motor, etc.

3. Synchronous motor with variable frequency.

For synchronous motors with a fixed speed and asynchronous motors with a constant power electronic load on the stator, the frequency converter cannot be used for speed regulation.

Points to note when using the inverter

For three-phase motors that can use frequency converters, we need to pay attention to the following issues:

1. Choose a suitable frequency converter.

2. Make reasonable settings according to actual needs.

3. Special treatment is required for three-phase motors under special working conditions.

4. Maintenance of the three-phase motor is required.

In short, the frequency converter can be used to adjust the speed of a three-phase motor, but attention must be paid to selecting the appropriate three-phase motor type and the correct method of use.