Electric Motor PSPICE Simulation

Abstract

DC motors are still the commonly used machines as variable speed drives. The methods used for modeling DC machines are far simpler and more straightforward than those used for modeling AC machines. Especially, since developments in the design of controlled rectifiers and DC–DC converters, the control of DC motors is realized more quickly. The motor contains mechanical variables and components in armature circuit and the output circuit. Besides, The electrical equivalent circuit has the same equation structure with the mechanical system. By using the correlation of equations, all of mechanical variables and components are indicated regarding electrical circuit elements and electrical variables. Even though the DC motor system contains mechanical components and variables, all variables and components in the model are electrical. The desired variable voltage is achieved by a controlled rectifier or DC–DC converter. In these motors, The armature current, field current, torque, and flux are controlled separately from each other. It lets motors get high performance. Therefore, in the control of the motor, the field current is used as a constant value. Besides, the motor drive system is controlled by only one variable, armature current. The main objective of this experiment was to develop a control system to create the speed profile given with the motor given. A load and motor were to be simulated by using PSPICE with a given speed profile. The control system was to be designed with an inner current loop and an outer speed loop. The system included the load, DC motor, and DC-DC converter.