High Voltage AC Induction Motors - Marathon Electric
... for use on high fault capacity installations. The design of the industrial phase segregated terminal box not only minimises the possibilities of a fault but also in the event of a fault occuring will limit its magnitude by ensuring that a line-to-line fault cannot develop. The phase segregated termi ...
... for use on high fault capacity installations. The design of the industrial phase segregated terminal box not only minimises the possibilities of a fault but also in the event of a fault occuring will limit its magnitude by ensuring that a line-to-line fault cannot develop. The phase segregated termi ...
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... and Imaxcos(ωt + 120°) -- square them, multiply by the resistance R, and then add, the result is the constant (3/2)Imax2R = 3 I2R. The power is applied steadily as in DC circuits -- not in pulses as in single-phase AC circuits. This is a great advantage, giving 3-phase machines 48% greater capacity ...
... and Imaxcos(ωt + 120°) -- square them, multiply by the resistance R, and then add, the result is the constant (3/2)Imax2R = 3 I2R. The power is applied steadily as in DC circuits -- not in pulses as in single-phase AC circuits. This is a great advantage, giving 3-phase machines 48% greater capacity ...
Feedback_what did I learn
... -LW response: wL=1/RC1 + 1/RC2 + ... Each time constant is calculated by short-circuiting the voltage source and the other capacitances (coupling and bypass), and opening the current sources. -HW response: wH=1/(RC1+1/RC2+...) Each time constant is calculated by making the other stray capacitances a ...
... -LW response: wL=1/RC1 + 1/RC2 + ... Each time constant is calculated by short-circuiting the voltage source and the other capacitances (coupling and bypass), and opening the current sources. -HW response: wH=1/(RC1+1/RC2+...) Each time constant is calculated by making the other stray capacitances a ...
50/30 PTCDF/T2 Operators Manual
... as there is no indication on the voltmeter on start up. This will sometimes be caused by a too careful increase in power take-off speed. Rated speed isn't actually reached. The better procedure is to adjust to maximum, then back down to maintain the indication in the "green" portion of the color ban ...
... as there is no indication on the voltmeter on start up. This will sometimes be caused by a too careful increase in power take-off speed. Rated speed isn't actually reached. The better procedure is to adjust to maximum, then back down to maintain the indication in the "green" portion of the color ban ...
Experiment 6 - UniMAP Portal
... Shaded-Pole Motors A shaded-pole induction motor is an induction motor with only a main winding. Instead of having an auxiliary winding, it has salient poles and one portion of each pole is surrounded by a short-circuited coil called a shading coil (see Figure 6.6a). A time-varying flux is induced i ...
... Shaded-Pole Motors A shaded-pole induction motor is an induction motor with only a main winding. Instead of having an auxiliary winding, it has salient poles and one portion of each pole is surrounded by a short-circuited coil called a shading coil (see Figure 6.6a). A time-varying flux is induced i ...
Document
... or dry process. But, in general, they are tubular, slightly tilted from the horizontal and have a ring gear fitted around them which engages with one or two pinions. Each pinion drive shaft is driven by a variable speed motor. The rating of the motors used for driving the kilns vary from 100-1000 k ...
... or dry process. But, in general, they are tubular, slightly tilted from the horizontal and have a ring gear fitted around them which engages with one or two pinions. Each pinion drive shaft is driven by a variable speed motor. The rating of the motors used for driving the kilns vary from 100-1000 k ...
Alternator
... 3000 min-1, as network freqeuency 50 Hz Low-acting alternators are driven by low-acting machine (mostly by water turbine). Speed turn is whole number ratio of 3000 min-1, as network frequency 50 Hz It makes mechanically connected set with driving machine. Driving machine and alternator are on the sa ...
... 3000 min-1, as network freqeuency 50 Hz Low-acting alternators are driven by low-acting machine (mostly by water turbine). Speed turn is whole number ratio of 3000 min-1, as network frequency 50 Hz It makes mechanically connected set with driving machine. Driving machine and alternator are on the sa ...
motorintro - Cleveland State University
... the stator has two phases (windings), and the rotor has two magnetic poles. If we send current through winding 1 in the direction shown in Figure 2a, with no current through winding 2, the rotor will naturally align itself in the direction shown in Figure 2a, with its south pole pointing in the nort ...
... the stator has two phases (windings), and the rotor has two magnetic poles. If we send current through winding 1 in the direction shown in Figure 2a, with no current through winding 2, the rotor will naturally align itself in the direction shown in Figure 2a, with its south pole pointing in the nort ...
Lab 3
... Kenwood, but your team may be using a different brand of power supply.) Be sure to plug in the DC Power Supply. Be sure the knobs are turned all the way down. iv) Use the 0-50A DC ammeter and an insertion plug to measure Iagen in Line 1 on the generator test table. Remember the proper method from DC ...
... Kenwood, but your team may be using a different brand of power supply.) Be sure to plug in the DC Power Supply. Be sure the knobs are turned all the way down. iv) Use the 0-50A DC ammeter and an insertion plug to measure Iagen in Line 1 on the generator test table. Remember the proper method from DC ...
Subsynchronous converter cascade SCC
... The SCC can basically be deployed in all branches of industry. The traditional SCC (Fig 1) is suitable where no high dynamics are required and a limited speed range (0.5...0.9 nS) is sufficient. Examples include drives for centrifugal compressors, blowers and rotary pumps. As compared with throttle- ...
... The SCC can basically be deployed in all branches of industry. The traditional SCC (Fig 1) is suitable where no high dynamics are required and a limited speed range (0.5...0.9 nS) is sufficient. Examples include drives for centrifugal compressors, blowers and rotary pumps. As compared with throttle- ...
HFSR Soft Starter
... The starting current reduces well below DOL value, the actual permissible value depends upon the starting torque and starting current parameters of the motor and torque speed characteristics of the driven load. Please refer to Fig. 1. As the motor accelerates the current drawn by motor goes on reduc ...
... The starting current reduces well below DOL value, the actual permissible value depends upon the starting torque and starting current parameters of the motor and torque speed characteristics of the driven load. Please refer to Fig. 1. As the motor accelerates the current drawn by motor goes on reduc ...
Motor Starting Characteristics of Star
... • Armature resistance is so low, if it is connected to power supply directly ; huge current will pass thru armature. • The huge current may damage the machine, major heat, very high speed in case of DC series motor. • Ia = V/Ra ...
... • Armature resistance is so low, if it is connected to power supply directly ; huge current will pass thru armature. • The huge current may damage the machine, major heat, very high speed in case of DC series motor. • Ia = V/Ra ...
Magnetic field measurement
... With time we have gained some experience on large generator equipment. The research on air-gap monitoring lead us to the development of other instruments. One of latest instruments tried at Hydro-Quebec is the magnetic field monitoring system. We suspect that magnetic unbalance may be the cause of m ...
... With time we have gained some experience on large generator equipment. The research on air-gap monitoring lead us to the development of other instruments. One of latest instruments tried at Hydro-Quebec is the magnetic field monitoring system. We suspect that magnetic unbalance may be the cause of m ...
2. TYPES AND SHAPES OF WINDING WIRES: The winding wires
... slots according to the design requirements and hence the slots and conductor combination will not produce a mechanically balanced winding. Under such conditions some coils are placed in the slots, not connected to the remaining part of the winding but only for mechanical balance. Such windings are c ...
... slots according to the design requirements and hence the slots and conductor combination will not produce a mechanically balanced winding. Under such conditions some coils are placed in the slots, not connected to the remaining part of the winding but only for mechanical balance. Such windings are 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.