Dc Machine

2A. i) Starting the linear DC motor: Starting the linear DC motor: (See Figure 1) The switch closes and current flows. The current flow is amazing, this is Kirchhoff's voltage law. Note: Since the bar is stationary, eind = 0 I = VB - eind = VB / R R R When a current flows, a magnetic force is generated and a force is generated on the wire. Search = i / B column becomes faster. As the speed of the bar rises, the voltage is displayed on the bar id = vBl

Classical machine groups represent asynchronous induction, synchronous, DC motors and variable reluctance motors. Among these conventional machines, asynchronous motors are most widely used in a wide range of applications and are used as electric motors (converting power to mechanical power) or as generators (converting mechanical power to electric power) It can operate. The machine can be powered by a power converter or directly connected to an AC or DC power supply. Motors are based on four principles. The first principle is that an electric current generates a magnetic field around it, which can be strengthened more than 1000 times as it passes through iron.

The DC motor consumes DC power and generates mechanical torque. The DC motor is classified by the connection of the excitation circuit to the armature circuit. Conventional DC motors are divided into shunts, series or separate excitation. Also, a motor called composite wounds is often seen. There are no fundamental differences between shunts, series, or separately excited DC motors. These names only reflect the way exciter and armature circuits are connected to each other.

The Ward-Leonard system is a traditional way of speed control. It consists of a three phase induction motor which controls a separately energized DC generator. The DC generator supplies a variable DC voltage to the DC motor. It is basically DC variable speed drive. The principle of the Ward-Leonard system is that the DC generator can influence the torque and speed required to actually generate the load. Therefore, the speed of the generator is proportional to the armature voltage applied to the DC motor. After controlling the excitation voltage (excitation voltage) to control the output voltage of the DC generator, control the rotation speed of the DC motor