What does axle control and frame control of locomotive mean?
Many so-called axis controls are only inverters that independently control a motor, and the previous rectifier or intermediate loop is still common to several motors.
The frame control means that each inverter controls more than two motors. In most cases, the motor on the bogie is controlled by an inverter, which is the origin of the frame control name.
Axis control means that each inverter independently controls a motor, and the full axis in a strict sense should include a rectifier and the intermediate loop is completely independent. But in practice, in order to reduce costs and reduce volume
