Power electronics devices [t-head1-first]

The power electronics devices provide infinitely variable adjustment of physical variables – such as speed or torque – to the application process. The power is drawn from the electrical mains, converted in the power electronics apparatus and fed to the consumer (i.e. the motor).

Semiconductor contactors [t-head3]

Semiconductor contactor allow fast, silent switching of three-phase motors and resistive loads. Switching takes place automatically at the ideal point in time and suppresses unwanted current and voltage peaks.

Soft starters [t-head3]

Soft starters ramp the voltage fed to the motor up to 100% of the mains voltage. The motor starts virtually jerk-free. The voltage reduction causes a quadratic torque reduction in relation to the motor's normal starting torque. Soft starters are therefore especially well suited to starting loads with a quadratic speed or torque characteristic (e.g. pumps or fans).

Frequency inverters [t-head3-col]

Frequency inverters convert the AC or three-phase system with its constant voltage and frequency into a new, three-phase system with variable voltage and frequency. This voltage/frequency control enables stepless speed control of three-phase motors. The controlled drive can be operated at rated-load torque even at low speeds.

Vector frequency inverters [t-head3]

While conventional frequency inverters control three-phase motors using a charactieristic-controlled U/f (voltage/frequency) relationship, vector frequency inverters work using a sensorless, flow-oriented control of the motor’s magnetic field. The controlled variable is the motor current. This allows an opimized control of the torque for demanding applications (mixers and agitators, extruders, transport and conveying installations).