Converter fed Drives

1. EE8601
SOLID STATE DRIVES

2. PRE –
REQUISITES
POWER ELECTRONICS
ELECTRICALMACHINES

3. UNIT III –
INDUCTION
MOTOR
DRIVES
Stator voltage control
V/F control
Rotor Resistance control
Slip power recovery schemes
Vector control
Applications

4. PRINCIPLE OF INDUCTION MOTOR
TYPES OF SPEED CONTROL OF INDUCTION MOTOR
STATOR VOLTAGE CONTROL

5.  https://youtu.be/AQqyGNOP_3o
 Working principle of induction motor

6. SPEED CONTROL
STATOR SIDE
STATOR
VOLTAGE
V/F
CONTROL
ROTOR SIDE
ROTOR RESISTANCE
SLIP POWER RECOVERY CONTROL
VECTOR CONTROL

7.  From the torque
equation
 T ∝ sE2
2
 E2 ∝ V
 T ∝ sV2
 V
 T
 Hence to maintain
load torque,
 slip s
 N

8.  This method gives a speed control only below the normal rated
speed.
 Voltages if higher than the rated voltage is not admissible.
 This method for intermittent operation of the drive and for the fan
and pump drives.
 As in fan and pump the load torque varies as the square of the
speed. These types of drives required low torque at lower speeds.
 This condition can be obtained by applying lower voltage without
exceeding the motor current.

9.  By using External resistance in the stator circuit of the motor.
 By using an Auto transformer
 By using a Thyristor voltage controller
 By using a TRIAC Controller

11. PRINCIPLE OF INDUCTION MOTOR
TYPES OF SPEED CONTROL OF INDUCTION MOTOR
STATOR VOLTAGE CONTROL

12. https://www.proprofsgames.com/ugc/word-games/hangman/control-methods-
of-im-drives/