Oct 24 2011
AC Drives: Is Sensorless Vector Mode Always Best?
When buying AC drives, you might be wondering if a sensorless vector drive or mode is always best for every application. The short answer to this question is “no.” While sensorless vector AC drives do eliminate the need for sensors, thus reducing the complexity of an operation as well as overall costs, these should only be used if your operation does not require precise positioning for the motor. Why? While in sensorless vector mode, the drive will only estimate using an algorithm as well as the voltage and current measurements to control the motor. The drive estimates where the motor rotor is located, and then uses firing circuits to apply voltage pulses to the windings, which moves or pushes the rotor into the correct location with just the right amount of force. In applications that do require precise positioning of the rotor, it is recommended that you install an AC drive that uses closed loop technology or a sensorless vector drive that can be set to various modes depending on the application. Check with distributors such as Carotron, Inc. to discuss your AC or DC drive application needs. You can then decide whether to order a sensorless vector AC drive or to consider other options!
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