Abstract - theelectromech.in
... The device is aimed at substituting conventional triac phase angle control drives. Circuit is capable of supplying single-phase a.c. induction motor (or general a.c. inductive/resistive load) with varying a.c. voltage at the start. Similar to triac control, voltage applied to load is varied from zer ...
... The device is aimed at substituting conventional triac phase angle control drives. Circuit is capable of supplying single-phase a.c. induction motor (or general a.c. inductive/resistive load) with varying a.c. voltage at the start. Similar to triac control, voltage applied to load is varied from zer ...
2011/12 - CSM2044 - Electrical Energy Conversion and Transport
... eddy-current losses in a revolving core, Current in an inductor. Week 3 DC Machines: Series generator, Shunt generator, Compound generator, Separately excited generator, Improving the waveshape, Induced voltage, No-Load operation and saturation curve, Load characteristics, Acceleration of the motor, ...
... eddy-current losses in a revolving core, Current in an inductor. Week 3 DC Machines: Series generator, Shunt generator, Compound generator, Separately excited generator, Improving the waveshape, Induced voltage, No-Load operation and saturation curve, Load characteristics, Acceleration of the motor, ...
57KB - NZQA
... The effect of a reversed winding on the operation of a three-phase induction motor is stated, and two methods of rectification are explained. ...
... The effect of a reversed winding on the operation of a three-phase induction motor is stated, and two methods of rectification are explained. ...
Microelectromechanical Devices
... Speeds not as easily controlled as dc motors Draw large starting currents, typically 6-8 x their full load values Operate with a poor lagging power factor when lightly loaded ...
... Speeds not as easily controlled as dc motors Draw large starting currents, typically 6-8 x their full load values Operate with a poor lagging power factor when lightly loaded ...
DC Motors - United States Naval Academy
... A 120 VDC permanent magnet DC motor with KV = 0.95 V·s is measured under the following two conditions (same voltage applied): 1. Motor is unloaded, IA = 2 A. 2. Motor is loaded until IA = 15 A and 1200 rpm. ...
... A 120 VDC permanent magnet DC motor with KV = 0.95 V·s is measured under the following two conditions (same voltage applied): 1. Motor is unloaded, IA = 2 A. 2. Motor is loaded until IA = 15 A and 1200 rpm. ...
Elec467 Power Machines & Transformers
... R1 = RS per Fig. 5-4 In these definitions the operative word is “per phase”. The equivalent circuit represents 1 phase of the three thus the power isn’t determined by the power in one phase but by multiplying the power for one phase by 3. Also, voltage and current measurements are line values that h ...
... R1 = RS per Fig. 5-4 In these definitions the operative word is “per phase”. The equivalent circuit represents 1 phase of the three thus the power isn’t determined by the power in one phase but by multiplying the power for one phase by 3. Also, voltage and current measurements are line values that h ...
NGEE ANN POLYTECHNIC MECHANICAL ENGINEERING
... Alternating Current (AC). An electric current that reverses direction sinusoidally. Concept of phases and frequency. Direct Current (DC). Current flow is unidirectional and of constant magnitude . Negative and positive terminals (battery, cells) ...
... Alternating Current (AC). An electric current that reverses direction sinusoidally. Concept of phases and frequency. Direct Current (DC). Current flow is unidirectional and of constant magnitude . Negative and positive terminals (battery, cells) ...
Lecture VI - AC Machines II
... efficiency. Therefore induction machines are usually referred to as induction motors. ...
... efficiency. Therefore induction machines are usually referred to as induction motors. ...
EE3003-ModelPaper-2013
... (a) Draw the typical Toque/Slip and Torque/Speed characteristics of a three phase induction motor separately. Indicate all the operating modes on the same plot. (b) A three phase 4-pole, 400V, 50Hz squirrel cage induction motor has the following equivalent circuit parameters referred to the stator s ...
... (a) Draw the typical Toque/Slip and Torque/Speed characteristics of a three phase induction motor separately. Indicate all the operating modes on the same plot. (b) A three phase 4-pole, 400V, 50Hz squirrel cage induction motor has the following equivalent circuit parameters referred to the stator s ...
Induction motor
An induction or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor therefore does not require mechanical commutation, separate-excitation or self-excitation for all or part of the energy transferred from stator to rotor, as in universal, DC and large synchronous motors. An induction motor's rotor can be either wound type or squirrel-cage type.Three-phase squirrel-cage induction motors are widely used in industrial drives because they are rugged, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFDs) in variable-speed service. VFDs offer especially important energy savings opportunities for existing and prospective induction motors in variable-torque centrifugal fan, pump and compressor load applications. Squirrel cage induction motors are very widely used in both fixed-speed and variable-frequency drive (VFD) applications. Variable voltage and variable frequency drives are also used in variable-speed service.