The Fast One

Highest speeds, lowest motor heating and best control performance – always in real time: The technical basis is the controlled intermediate DC circuit combined with the established pulse-amplitude modulation (PAM) which allows SD2S doing without additional motor chokes even at high speeds. Based on this technology SIEB & MEYER developed two extremely robust and sensorless control methods: V/f-PAM for asynchronous motors and FPAM for synchronous motors. The usually very special applications in this area require close coordination between the user and SIEB & MEYER. Applications with a large variance of engine types (such as engine test stations) are rather unsuitable.

The existing standard SD2S-FPAM devices are also used as technical basis for customized devices. This way, the customer obtains an optimal solution that is individually adapted to the specific application.

Function - Advantage - Benefit

Output frequencies up to 8,000 Hz

Function: Established PAM technology with optimized dynamic characteristics, efficiency and flexibility.
Advantage: Virtually no speed limitation combined with optimized control dynamics and excellent system efficiency.
Benefit: Low initial costs, possibility to access new applications.

Sensorless control of synchronous and asynchronous motors

Function: The control of synchronous motors (FPAM) is based on the accurate EMF measurement in accordance to the rotor position. For asynchronous motors the well-proven drive function V/f-PWM is used.
Advantage: Cost-intensive speed sensors are not required. Flexible switching from synchronous to asynchronous motors is possible.
Benefit: Cost savings, easy initial operation.

No need of motor chokes or LC-filters

Function: The PAM technology allows smallest switching frequencies and reduces the electric stress of the motor as well as interferences (EMC) significantly.
Advantage: Additional filter elements or motor chokes are not required.
Benefit: Low system costs, easy initial operation.




Block Diagram

Block diagram SD2S-FPAM