Maintain Efficiency - Longo Electrical
... “pyrolyzed” to facilitate removal, that is, heated to the point where insulation physically breaks down. This process breaks down the chemical bonds that act to glue the winding wires to each other and to the core. Breaking these bonds allows the coils to be removed without physically damaging or di ...
... “pyrolyzed” to facilitate removal, that is, heated to the point where insulation physically breaks down. This process breaks down the chemical bonds that act to glue the winding wires to each other and to the core. Breaking these bonds allows the coils to be removed without physically damaging or di ...
Form-Wound Coils Random
... (VPI), the life expectancy of random windings is drastically reduced under severe environmental conditions or with applications involving nonlinear loads, such as silicon-controlled-rectified (SCR)-type loads. Kato Engineering Inc.’s experience with such applications has shown that form windings wit ...
... (VPI), the life expectancy of random windings is drastically reduced under severe environmental conditions or with applications involving nonlinear loads, such as silicon-controlled-rectified (SCR)-type loads. Kato Engineering Inc.’s experience with such applications has shown that form windings wit ...
- sir cr reddy college of engineering
... Calculate the parameters of equivalent circuit of T/F when secondary is refered to primary and the approximate full load regulation at 0.8pf lagging. 3How do you determine the parameters of the equivalent circuit of a single phase of 230/40V, 50HZ, T/F from the test results.(note:you need not draw t ...
... Calculate the parameters of equivalent circuit of T/F when secondary is refered to primary and the approximate full load regulation at 0.8pf lagging. 3How do you determine the parameters of the equivalent circuit of a single phase of 230/40V, 50HZ, T/F from the test results.(note:you need not draw t ...
Permanent Magnet Synchronous Machine Parameters Identification
... and by accepted presumptions [18]. That means calculations should be verified by experiments any case. Reactances of variable speed PMSM are usually expressed as inductances for practical reasons. There were used different measurement methods for direct axis inductance Ld and quadrature axis inducta ...
... and by accepted presumptions [18]. That means calculations should be verified by experiments any case. Reactances of variable speed PMSM are usually expressed as inductances for practical reasons. There were used different measurement methods for direct axis inductance Ld and quadrature axis inducta ...
Identification of Impending Interturn Faults in Random
... initial stages being not discernable and any changes in the capacitive current components are negligibly very small and of very high frequency content. This paper deals with a simple technique, utilizing the effect of the interturn fault in modifying the high frequency components of the applied puls ...
... initial stages being not discernable and any changes in the capacitive current components are negligibly very small and of very high frequency content. This paper deals with a simple technique, utilizing the effect of the interturn fault in modifying the high frequency components of the applied puls ...
Sensorless position control of permanent magnet motors with
... Among the commonly used structures for linear permanent magnet synchronous motors the tubular one allows to better exploit the permanent magnet flux reducing size and end effects. Similarly to rotating machines, the tubular permanent magnet synchronous motor (LTPMSM) need position information to syn ...
... Among the commonly used structures for linear permanent magnet synchronous motors the tubular one allows to better exploit the permanent magnet flux reducing size and end effects. Similarly to rotating machines, the tubular permanent magnet synchronous motor (LTPMSM) need position information to syn ...
Sebuah Kajian Pustaka:
... The advantages of DFIG are small volume of motor and without full-power rectifier inverter controller[13]. The obvious disadvantage is that the motor rotor has brushes and slip rings which greatly increases the system's failure rate and the costs and reduces the reliability of the system. With the d ...
... The advantages of DFIG are small volume of motor and without full-power rectifier inverter controller[13]. The obvious disadvantage is that the motor rotor has brushes and slip rings which greatly increases the system's failure rate and the costs and reduces the reliability of the system. With the d ...
View PDF - Research Trend
... variable speed as well as constant speed prime movers, low unit cost, reduced maintenance, rugged and brushless rotors, absence of a separate d.c. source for excitation, absence of moving contacts, inherent overload protection, improved performance due to low transient impedance, natural protection ...
... variable speed as well as constant speed prime movers, low unit cost, reduced maintenance, rugged and brushless rotors, absence of a separate d.c. source for excitation, absence of moving contacts, inherent overload protection, improved performance due to low transient impedance, natural protection ...
Additional Installation, Operating and Maintenance Instructions
... adjustment of the releases the rated value of the phase current, that means it is based on the x0,58 rated current of the motor. If such a connection is not possible, suitable protection switches has to be used, for example with phase failure control. For pole-changing motors current-dependent delay ...
... adjustment of the releases the rated value of the phase current, that means it is based on the x0,58 rated current of the motor. If such a connection is not possible, suitable protection switches has to be used, for example with phase failure control. For pole-changing motors current-dependent delay ...
Detection of Stator Winding Inter-turn Short Circuit In Induction Motor
... experimental tests in the special machines & drive laboratory at Iran University of Science & Technology. The following parts of this paper will priority study the influence of faulty rotor windings causes of vibration to motor. Through the experiment , the time-domain vibration signal of motor’s fr ...
... experimental tests in the special machines & drive laboratory at Iran University of Science & Technology. The following parts of this paper will priority study the influence of faulty rotor windings causes of vibration to motor. Through the experiment , the time-domain vibration signal of motor’s fr ...
UNIT – III Induction Motor Drives
... starting, braking and reversing performance. 12. Give the importance of noise level in the selection of a motor. Noise level is the important feature to be considered while making the selection of a motor. Noise should be kept as low as possible in the workshops, hospitals and other domestic purpose ...
... starting, braking and reversing performance. 12. Give the importance of noise level in the selection of a motor. Noise level is the important feature to be considered while making the selection of a motor. Noise should be kept as low as possible in the workshops, hospitals and other domestic purpose ...
Basic Vocational Knowledge - Electrical Machines
... The operation of electrical machines results from their incorporation into the process of energy conversion in the generation, transmission and consumption of electric power. Thus, for example, in a power station the combustion heat of coal, natural gas, etc. is employed in boilers for steam generat ...
... The operation of electrical machines results from their incorporation into the process of energy conversion in the generation, transmission and consumption of electric power. Thus, for example, in a power station the combustion heat of coal, natural gas, etc. is employed in boilers for steam generat ...
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.