workbook_m_g_answers..
... Electromagnetic induction – creation of an emf in a conductor when there is relative motion between the conductor and magnetic field or a changing magnetic flux. Expt: moved a magnet through a coil attached to a sensitive galvanometer – observed a deflection of the galvanometer’s needle indicating a ...
... Electromagnetic induction – creation of an emf in a conductor when there is relative motion between the conductor and magnetic field or a changing magnetic flux. Expt: moved a magnet through a coil attached to a sensitive galvanometer – observed a deflection of the galvanometer’s needle indicating a ...
Synchronous Current Control of Three phase Induction motor by
... PWM current control is one of the methods whose task is to force the actual current to track reference wave by means of switches. In low speed region of the machine, when CEMF is low, there is no difficulty in current controller tracking. However at higher speed, the current controller will saturate ...
... PWM current control is one of the methods whose task is to force the actual current to track reference wave by means of switches. In low speed region of the machine, when CEMF is low, there is no difficulty in current controller tracking. However at higher speed, the current controller will saturate ...
Performance Analysis of Double Inverter Fed Wound Rotor Induction
... two controllers, one Fuzzy based controller for stator and another one PID based for rotor. Such a mixed implementation leads to a more effective control design objectives such as steady state and transient characteristics of the closed loop system. Fuzzy logic is integrated to overcome the problems ...
... two controllers, one Fuzzy based controller for stator and another one PID based for rotor. Such a mixed implementation leads to a more effective control design objectives such as steady state and transient characteristics of the closed loop system. Fuzzy logic is integrated to overcome the problems ...
The speed controls of three phase induction motor from rotor side
... is that with addition of external resistance starting torque increases but this method of speed control of three phase induction motor also suffers from some disadvantages : 1. The speed above the normal value is not possible. 2. Large speed change requires large value of resistance and if such larg ...
... is that with addition of external resistance starting torque increases but this method of speed control of three phase induction motor also suffers from some disadvantages : 1. The speed above the normal value is not possible. 2. Large speed change requires large value of resistance and if such larg ...
Journal of Environmental Science, Computer Science and
... Ranjana Khandare, Pritam Kumar and Asutosh Kumar Pandey Rishiraj Institute of Technology, Indore [M.P] India ...
... Ranjana Khandare, Pritam Kumar and Asutosh Kumar Pandey Rishiraj Institute of Technology, Indore [M.P] India ...
Herbert Stemmler
... control. This has to be achieved with rated stator flux and a purely active stator current in order to keep converter and motor as small as possible at the given power and speed ratings. The simplified basic control structure shown in Figure 7-16 should be regarded rather as an illustration of the c ...
... control. This has to be achieved with rated stator flux and a purely active stator current in order to keep converter and motor as small as possible at the given power and speed ratings. The simplified basic control structure shown in Figure 7-16 should be regarded rather as an illustration of the c ...
Commutator (electric)
A commutator is the moving part of a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine. The commutator is one component of a motor; there are also two or more stationary electrical contacts called ""brushes"" made of a soft conductor like carbon press against the commutator, making sliding contact with successive segments of the commutator as it rotates. The windings (coils of wire) on the armature are connected to the commutator segments. Commutators are used in direct current (DC) machines: dynamos (DC generators) and many DC motors as well as universal motors. In a motor the commutator applies electric current to the windings. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced. In a generator the commutator picks off the current generated in the windings, reversing the direction of the current with each half turn, serving as a mechanical rectifier to convert the alternating current from the windings to unidirectional direct current in the external load circuit. The first direct current commutator-type machine, the dynamo, was built by Hippolyte Pixii in 1832, based on a suggestion by André-Marie Ampère. Commutators are relatively inefficient, and also require periodic maintenance such as brush replacement. Therefore, commutated machines are declining in use, being replaced by alternating current (AC) machines, and in recent years by brushless DC motors which use semiconductor switches.