1. Mechanical characteristics When the input armature voltage Ua remains unchanged, the motor speed n changes with the change of the electromagnetic torque M, which is called the mechanical characteristics of the DC motor.
2. Adjustment characteristics The law that the steady-state speed n of the DC motor changes with the change of the armature control voltage Ua under a certain electromagnetic torque M (or load torque) is called the adjustment characteristics of the DC motor.
3. Dynamic characteristics From the original stable state to the new stable state, there is a transition process, which is the dynamic characteristics of the DC motor.
