Control of electrical drives

Based on the motor equ ivalent circuit diagram
(serial connection R, L, E. ) for separately DC
motor ( steady state, constant supply voltage):
• write a voltage equation,
• specify the sign of the electric power,
• specify the sign of the electromagnetic torque,
For:
- First quadrant (uphill of the car),
- Second quadrant (downhill of the car),
mechanical characteristics (speed - torque) of
the system (draw it).