SD4x series by SIEB & MEYER – drive technology for grinding and dressing processes
Press releases
Constant Speed, Minimum Heat Development
In the fields grinding and dressing, the drive technology used determines the process stability and also how compact a machine can be built. The highly efficient drive controllers of series SD4x by SIEB & MEYER can operate dressing spindles with exceptional precision and dynamics. Thanks to their excellent control performance, SD4x devices keep the motor heating low and enable stable operation of sensorless asynchronous spindles.
Rotary grinding and diamond dressing tools operate under demanding conditions. High speeds, changing loads and limited installation space are daily routine with many grinding machines. This makes a suitable drive system that can control the spindles reliably with constant speeds even under dynamic conditions particularly important. Drive controllers of series SD4x by SIEB & MEYER are specially designed for high rotating field frequencies and stand out for their high speed stability. In addition to controlling the spindle, these devices also serve as interface to the machine control and provide it with all relevant process data.
Constant spindle temperatures as key factor
A critical aspect for grinding applications is the thermal stability of the process. If the temperature rises, the overall length of the spindle changes and the tool shifts. Even minor deviations can have a negative impact on the processing results. SD4x controllers ensure minimum motor heating and therefore help to keep the spindle temperature constant.
In addition, the drives must be able to cope with changing loads. For grinding processes and especially for dressing, constant speed is as relevant as high available torque. At this point, the importance of the control technology becomes apparent, in particular the sensorless vector control (SVC) that SIEB & MEYER also offers for asynchronous motors. SVC determines and controls the speed without an additional sensor via current and voltage values. This way, sensorless dressing spindles can be operated with high dynamics.
For machine manufacturers, this reduces the engineering effort because the spindles are more compact and they can optimally use the limited installation space inside the machine.
Individual solutions via parameterization
Since there are numerous different spindle types and motor variants in the field, the parameterization of the drive controller plays a central role. Therefore, SIEB & MEYER and its customers work in close cooperation to adapt the control to the individual spindle characteristic curve. This results in individual drive concepts that are exactly adapted to the special requirements of dressing applications: constant speeds, low thermal load and compact integration into the machine.