What type of starter motor is commonly used in diesel engines?

The commonly used starter motor in diesel engines is a solenoid-operated direct current starter motor. This type of starter motor is preferred due to its efficiency and reliability in delivering the high torque needed to crank large diesel engines.

Diesel engines typically require a robust starting mechanism because of their higher compression ratios compared to gasoline engines. The solenoid-operated direct current starter provides the necessary power burst to start the engine, allowing the engine to overcome its resistance to start under cold conditions or heavy loads. The solenoid acts as a switch that engages the starter motor when the ignition switch is turned on, ensuring that the motor only operates when needed.

In contrast, pneumatic starter motors are less common in this application and are more often found in larger industrial machines or specific scenarios where compressed air systems are utilized. High-speed AC starter motors, while effective in some applications, are not typically suitable for diesel engines due to the need for high torque at low speeds. Mechanical gear starter motors, though they may provide sufficient torque, are less efficient and reliable compared to electric starters in the context of柴油 engines.