Calibration

Question: Does the system (motor plus driver) have to be (individually) tuned to obtain the desired specs? In other words: when manufacturing in volume and considering all tolerances of the parts (mechanical, electrical and piezos) does each assembly have to be individually calibrated?

Answer: No. By measuring the DC supply current to the motor driver, and make a frequency sweep to determine the optimal drive frequency. This can be done during manufacturing as well as every time the motor is turned on. The motor resonance frequency is mostly determined by mechanical constants of the PCB-material and it is necessary to compensate for the change in resonance frequency for the best performance over temperature. For continuous operation the new tracking feature in our Development box version 4 is an effective way of setting the optimum frequency to compensate for the self-heating in the motor. This feature is implemented in or development box, and we recommend to include this feature in your microcontroller Software making the system self calibrated. See the manual for development box for further details. Source code for the Development box is included as part of the package.