Klockner Moeller Electric Parts from KlocknerMoeller.net
|
 |
Call Toll Free!
1-877-595-9616
|
|
Largest Authorized Stocking USA Distributor
Representing
|
Electronic motor
starters and drives
Basics of drives engineering |
Power electronics devices
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
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
Soft starters ramp the voltage fed to the motor up to mains
voltage, so that the motor starts almost jolt-free. The
voltage reduction leads to a square-law torque reduction in
relation to the motor’s normal starting torque. Soft starter
are therefore especially well suited to starting loads with
a square-law speed or torque characteristic (such as pumps
or fans).
Frequency inverters
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
While conventional frequency inverters control three-phase
motors using a characteristic-controlled U/f
(voltage/frequency) relationship, vector frequency inverters
work using a sensor less, flow-oriented control of the
motor’s magnetic field. The controlled variable is the motor
current. This allows an optimized control of the torque for
demanding applications (mixers and agitators, extruders,
transport and conveying installations
|
| |
|