Delta Output Filter

 

Filtering of inputs and outputs is commonly used to smooth motion. An Output Filter in challenging motion control applications has proven to resolve problems when low resolution feedback, extreme load variations, poor hydraulic design, or valve quality lead to a machine specific problem.

 

In addition to an Output Filter for position control, Delta motion controllers now provide an Output Filter for Pressure/Force control, including “dual-loop” axes that control position and pressure with the same actuator. Without the Output Filter, designers closing position or force control loops may shy away from using differential gain since this gain can cause the control output to oscillate leading to poor performance. By using the Output Filter, noise is removed in the differential gain allowing the differential gain to be significantly increased. This helps the actual value to track the target value of the axis position or force more closely.

  

Typically, the Output Filter can be set to a value close to the system’s natural frequency. For example, if a system naturally oscillates at 10Hz, a good starting HZ value for the Output Filter is 10 or higher. This filters out noise that occurs faster than the system can respond, while allowing the controls parameters to apply maximum effect.  

  

Delta Computer Systems, Inc.

1818 SE 17th Street

Battle Ground,  WA. 98604. 

Phone:  (360) 254-8688