What Is The Speed Of The Car Alternator

The speed of the car alternator is not a fixed value, but will change according to the design of different models and alternators and changes in engine speed. In general, the speed of the car alternator is between 2000 and 6000 revolutions per minute. But specific to each vehicle, the speed of its alternator may be different.
In addition, the speed of the vehicle alternator is also divided into three stages: zero current speed, charging start speed, maximum allowable speed. The zero current speed is usually specified at 1000 RPM, while the charging start speed is about 1500~2000 RPM. The maximum allowable speed is usually 15,000 to 20,000 RPM, but the maximum allowable speed of the truck alternator is usually only 10,000 to 15,000 RPM.
In addition, the speed of the alternator has a certain proportional relationship with the speed of the engine. In general, the gear ratio of the engine and the alternator is usually between 2 and 3, which means that the engine needs to turn 2 to 3 times. Therefore, if the idle speed of the car is 800 revolutions per minute, then the alternator can emit more than 12V voltage at about 1000 revolutions per minute.
In general, the speed of the automobile alternator is a dynamic range, which needs to be determined according to the specific model, the alternator design and the working state of the engine.