How does the ballast of three-wheeled motorcycle release pressure?

Does the subject want to ask "how does the rectifier of three-wheeled motorcycle release pressure?" Convert alternating current into direct current. Rectifier is a rectifier device existing in the main parts of electric tricycle. If the motorcycle engine does not pass through the rectifier, the voltage fluctuates greatly with the decrease of engine speed, which is easy to damage the electrical appliances. The pressure relief of motorcycle rectifier rectifier is to convert alternating current into direct current.