Rate of Voltage Change (dv/dt)
It is the rate of change with time of the voltage at a node, expressed in volts/nanosecond. Fast edges drive a current of i = C × dv/dt through parasitic capacitances; this current circulates through the housing, the shield and neighbouring signal lines and produces interference.
The midpoint of the H-bridge is a node that jumps between chassis and supply in every switching period. If a 24 V transition is completed in 50 ns, the dv/dt is approximately 0.5 V/ns. Everything capacitively coupled to this node takes a share of that change.
The consequences are concrete. Even a small parasitic capacitance of 10 pF drives a current of 5 mA under 0.5 V/ns; this current can create measurable disturbance on sensitive analogue inputs. The current circulating through the capacitance between the motor housing and the chassis is one of the classic noise paths.
This is why layout and wiring rules matter: separate the motor cable from analogue and RF signal cables, if possible leave at least 50 mm between them or cross them at 90 degrees. This 50 mm is the valid lower limit for the short motor cable of a low-voltage DC driver module; when an inverter panel or an antenna cable is involved, the separation is raised to about 20 cm. If you use a shield, ground it at one end only on low-frequency analogue signal cable, preferably at the driver end. These measures do not change the edge speed but largely cut off the noise produced from reaching the signal lines.
The context in which this term is used: DC Motor Driver Selection Guide