Re: locked rotor motor
Starting at the instant you supply power to a motor, the current will reach its very highest current in a first few milliseconds. As the motor begins to move, however slightly, the current will start to drop. When the motor has reached its cruising speed, the current will drop to its minimum value. If at that time the motor is turning a mechanical load that is equal to the motor?s rating, then the current drawn will be the figure that is known as ?Full Load Amps,? or FLA. But the peak current that is reached in a few milliseconds would stay at that level forever (or until the motor burns up), if the motor does not move. That value, known as ?Locked Rotor Current,? provides useful information (to the design engineer) about the motor?s internal resistance and about how the motor is likely to behave during a short circuit fault somewhere in the power distribution system.