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Elecrtical drives and control
   V=2ΠfTφKW

                 φ V/F
   Low frequency operation at constant voltage:

V constant; f decrease ; φ increases

   High frequency operation at constant voltage:

V constant ; f increase ; φ decrease
   f increase ; N increase ; Tmax decrease

   V increase; ; Tmax increase
Elecrtical drives and control
   Applications:
   ·     heating,
   ·     ventilation,
   ·     air conditioning systems,
   ·     waste water treatment plants,
   ·     blowers,
   ·     fans,
   ·     textile mills,
   ·     rolling mills, etc
The variable frequency and variable voltage can
 be obtained by,

   Volatge source inverter(VSI)
   Cycloconverter control
Elecrtical drives and control
.
   If regeneration is necessary, the phase controlled
    bridge rectifier is replaced by dual converter
   Due to chopper ,the harmonic injection into
    the ac supply is reduced
Elecrtical drives and control
   Input voltage kept constant output current
    depends upon the nature of load
Elecrtical drives and control
Elecrtical drives and control
Elecrtical drives and control
T




                              R 1< R 2< R 3
                                  nr1< nr2< nr3
                      R1
         R2
    R3

T




              nr3   nr2 nr1                   n
                                  ns~nNL
    An electronic chopper implementation is also
    possible as shown below but is equally
    inefficient.
Elecrtical drives and control
Elecrtical drives and control
   Instead of wasting the slip power in the rotor
    circuit resistance, a better approach is to
    convert it to ac line power and return it back to
    the line. Two types of converter provide this
    approach:

1) Static Kramer Drive - only allows
      operation at sub-synchronous speed.
2) Static Scherbius Drive - allows
      operation above and below
      synchronous speed
Elecrtical drives and control
Elecrtical drives and control
Elecrtical drives and control
Elecrtical drives and control
   Large pumps
   Fan type loads
Elecrtical drives and control
Elecrtical drives and control
Elecrtical drives and control
Elecrtical drives and control
Elecrtical drives and control
Elecrtical drives and control
Elecrtical drives and control
Elecrtical drives and control
Elecrtical drives and control

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Elecrtical drives and control

  • 2. V=2ΠfTφKW φ V/F  Low frequency operation at constant voltage: V constant; f decrease ; φ increases  High frequency operation at constant voltage: V constant ; f increase ; φ decrease
  • 3. f increase ; N increase ; Tmax decrease  V increase; ; Tmax increase
  • 5. Applications:  · heating,  · ventilation,  · air conditioning systems,  · waste water treatment plants,  · blowers,  · fans,  · textile mills,  · rolling mills, etc
  • 6. The variable frequency and variable voltage can be obtained by,  Volatge source inverter(VSI)  Cycloconverter control
  • 8. .
  • 9. If regeneration is necessary, the phase controlled bridge rectifier is replaced by dual converter
  • 10. Due to chopper ,the harmonic injection into the ac supply is reduced
  • 12. Input voltage kept constant output current depends upon the nature of load
  • 16. T R 1< R 2< R 3 nr1< nr2< nr3 R1 R2 R3 T nr3 nr2 nr1 n ns~nNL
  • 17. An electronic chopper implementation is also possible as shown below but is equally inefficient.
  • 20. Instead of wasting the slip power in the rotor circuit resistance, a better approach is to convert it to ac line power and return it back to the line. Two types of converter provide this approach: 1) Static Kramer Drive - only allows operation at sub-synchronous speed. 2) Static Scherbius Drive - allows operation above and below synchronous speed
  • 25. Large pumps  Fan type loads