|
✴✴ Motor cc ✴✴
At the instant of starting, when standing speed motor is zero, so that the counter electromotive force which is proportional to speed is also zero. This causes all the supply voltage drops in the armature winding, so that the moment of starting the engine that runs intensity is very high and can reach values up to ten times the rated current in stable operating regime and even for large motors, when the motor has reached a speed which remains constant, as the resistant torque and load torque are balanced.
As to limit the starting current to values compatible with the requirements of the job, and does not cause adverse effects windings resistance in series with the armature, consisting of a resistor starting up several steps is introduced in boot time is fully inserted and during priming the engine up to the rated speed is being pulled, either manually or automatically by electronic devices, the number jumps or "plots" to present the starting rheostat depend Softness specifying the starting and engine power.
|
