Is it necessary to connect an isolation transformer to the servo motor?

Electronic transformers can also be. As long as the voltage is consistent, or the use of appropriate power supply after filtering is also available Oh. Such as imported equipment, some using 3-phase 220V power supply, other countries do not use isolation transformers, but the addition of filters and get the effect of pure power. Isolation transformer is only used in the domestic 3-phase 220V or the following voltage is the practice of last resort.