H100+ Sensorless Vector Control: When to Use It and How to Tune It

 

Sensorless Vector Control (SVC), also known as Field Oriented Control (FOC) without a speed sensor, is a more advanced control method available on the H100 compared to standard V/F control. It provides improved motor performance, particularly in terms of speed regulation and torque response, especially at lower speeds, without requiring a physical speed feedback sensor.

 

SVC is recommended for applications that require better speed holding under varying loads, improved starting torque, or more dynamic response where the cost or complexity of an encoder is not desired.

 

To enable SVC, you typically select it as the control mode using a parameter in the DRV (Drive) group:

DRV-09 (Control mode): Set this parameter to '1 (Slip Compen)' (Slip Compensation, which is the SVC mode).

 

For optimal SVC performance, a motor auto-tuning procedure is usually required. This allows the drive to measure and learn the connected motor's electrical characteristics. The parameter to initiate auto-tuning is in the BAS (Basic Function) group:

BAS-20 (Auto Tuning): This parameter is used to start the auto-tuning process.