How much current is needed to start a car?

[LeAddyson]

Starting a car requires 100 to 300 amps of current, and the larger the engine displacement, the greater the starting current. Starting current refers to the minimum current obtainable under specific conditions at -17.8°C and -28.9°C, which can relate the battery's starting capability to variables such as engine displacement, compression ratio, temperature, starting time, the technical condition of the engine and electrical system, and the lower operating voltage for starting and ignition. The working principle of starting current is as follows: at the moment the motor is energized, the rotor speed is 0, and the synchronous rotating magnetic field cuts the rotor windings at a high speed, inducing a high electromotive force in the rotor windings and generating a large current. This current counteracts the magnetic flux of the stator field, and to maintain the original magnetic flux compatible with the power supply voltage, the stator winding automatically increases its current, thereby increasing the stator current of the motor.