Rectifier-inverter converter circuit configured to asynchronously-valve cascade

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Rectifier-inverter converter circuit configured to asynchronously-valve cascade

Complete rectifier-inverter converter designed operation in the AC drive performed asynchronously by the scheme-valve cascade. Converter is used for speed control of asynchronous motor with slip-ring motors. Energy output slip of the electric grid.

 

Functions:

  • "Soft" start the motor from zero to the desired speed of rotation
  • Long-term work with established speed within the range of regulation
  • Stabilization of preset speed
  • Braking with given rate
  • Using reversers in the stator circuit - reverse the direction of rotation
  • Braking without reverse
  • Tightening without stator switching

 

 

 

Application:

  • Mine fans, conveyors, winders
  • Crushers, mills
  • Rotary furnaces, blowers, forced-draft setting cement plants
  • Pumps water utility systems
  • Winches, rotors, pumps rigs
  • Conveyors great performance and great length
  • Drive mechanisms closed-die forging presses, shearing, press brake machines, drawing machines, cable machines
  • etc.

 

Benefits:
  • The relative simplicity of implementation - undervoltage rotor circuits and high reliability
  • High efficiency, slip energy recovery to the mains
  • Reduce the required power converter and high voltage transformer
  • Use of existing control systems utilizing rotary station as the backup equipment

 

Technical specification

Parameter Dimension Value
Supply voltage of stator
kV
0,22, 0,38; 0,4; 0,415; 0,6; 0,66; 0,69; 6; 6,3; 6,6; 10; 11
Rated current of stator
A
50, 100, 160, 200, 315, 400, 630, 1000
Supply voltage frequency Hz
50±1, 60±1
Line voltage rotor
V
230, 315, 380, 400, 600, 750, 825, 910, 1140, 1260
Rated current of rotor
A
50, 100, 160, 200, 315, 500, 800, 1000, 1600, 2000, 2500
Equivalent circuit:
- rectifier
- inverter

6-pulse bridge
6-, 12-pulse bridge
Speed control range

1:10
Efficiency
%
95
Permissible overcurrent
%

150% - 120 sec

175% - 60 sec
200% - 15 sec

Protection
IP21