Starting of Motors
1. To understand motor starting characteristics. Objectives: 2. To know the transitions and coil sequence Basic Motor Operations 3. To know the different starting methods of three phase and single phase AC and DC motors.
When AC induction motors are started, there is a large amount of current flowing into the motor (and system) as soon as power is applied to the motor. Starting of Motors Starting of Motors The range of this starting current is usually around 6 to 10 times the running current (of FLA).
Starting Motors FLA of Three Phase AC Motors (2005 NEC) Starting of Motors
Starting Motors Starting Three Phase AC Induction Motors 1. Full Voltage or Across the Line starting 2. Reduced Voltage starting 3. Soft starting Starting of Motors
Starting Motors Initial starting current of a typical Induction motor t I I st run start Starting Current Characteristics
Starting Motors Changing from one state to another. In motor control system, particularly in reduced voltage starting, transition refers to the change from starting condition to running condition. Two types of transition: 1. Open transition 2. Close transition Transitions
Starting Motors Open Transition - The motor is momentarily removed from the line t I I st run Reduced starting Normal starting Removed from the source Reduction in the starting current Transitions
Starting Motors Close Transition - The motor is not removed from the line t I I st run Reduced starting Normal starting Reduction in the starting current Transitions
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- Summer '19
- Electric motor, Three-phase electric power, Variable-frequency drive, STARTING MOTORS