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A.C. Motor Drives
This notes deals with control of a.c. motors such as Induction motor with power electronics circuit instead of normal voltage control methods. This topic is mainly the part of Electric Drives and it is included in GATE in Power Electronics.
The Topics covered in this notes are:
1. Induction Motor
a) Equivalent Circuit of Induction Motor
b) Power developed in Induction Motor
c) Torque developed and Torque-Slip Characteristics
2. Stator Voltage Control Method using A.C. Voltage Controller
a) Case I: Load Torque Constant
b) Case II: Load torque proportional to square of speed.
c) Applications of Stator Voltage Control
3. Stator Frequency Control:
a) Case I: V/f Control : For speed below rated speed
b) Case II: Frequency (f) Control: For speed above rated speed
c) Comparison between graphs of Constant Torque Region and Constant Power Region
4. Rotor Side Control:
a) Static Resistance Control using Chopper
5. Slip Power Recovery Scheme.
a) Static Kramer Drive
b) Static Scherbius Drive
5. Slip Power Recovery Scheme.
a) Static Kramer Drive
b) Static Scherbius Drive
