This paper presents torque/speed characteristics of electrical machine. Speed is not the same according to various type of electrical machine and field excitation voltage. And then, the speed of separately excited DC machine is inversely proportional to field excitation voltage that show in simulation results. The supply voltage is directly proportional to speed in series motor that show in simulation results. Impedance measurement from variable frequency of the three winding of rotating field machine is presented in this paper. Voltage and current values of Star/Delta conditions of Synchronous machine are simulated by using COM3LAB software, Main Unit, and Electrical Machine Module.