All About Electric Motors
... needle on a magnetic compass) will always point north. The magnetic force around a magnet forms a magnetic field. The field is made up of lines of force that run from the north pole to the south pole. When opposite poles are brought together, their lines of force join, but when like poles are brough ...
... needle on a magnetic compass) will always point north. The magnetic force around a magnet forms a magnetic field. The field is made up of lines of force that run from the north pole to the south pole. When opposite poles are brought together, their lines of force join, but when like poles are brough ...
Electric Motors - Energy Auditor
... What is the thumb rule for installing capacitors to motor terminal? The size of capacitor required for a particular motor depends upon the no-load reactive kVA (kVAR) drawn by the motor, which can be determined only from no-load testing of the motor. In general, the capacitor is then selected to not ...
... What is the thumb rule for installing capacitors to motor terminal? The size of capacitor required for a particular motor depends upon the no-load reactive kVA (kVAR) drawn by the motor, which can be determined only from no-load testing of the motor. In general, the capacitor is then selected to not ...
DC Machines - Electrical and Computer Engineering
... • Magnets can become demagnetized by overheating or because of excessive armature currents. • The flux density magnitude is smaller than in wound- field machines. Consequently, the torque produced per ampere of armature current is smaller in PM motors than in wound- field motors with equal power rat ...
... • Magnets can become demagnetized by overheating or because of excessive armature currents. • The flux density magnitude is smaller than in wound- field machines. Consequently, the torque produced per ampere of armature current is smaller in PM motors than in wound- field motors with equal power rat ...
Determination of synchronous motor vibrations due to
... good evaluation of the distribution of the magnetic forces along stators of electric motors. To obtain the evolution of forces in the time domain these calculations are done for each state selected for the electromagnetic field computation. The modeling approach described here, and given in details ...
... good evaluation of the distribution of the magnetic forces along stators of electric motors. To obtain the evolution of forces in the time domain these calculations are done for each state selected for the electromagnetic field computation. The modeling approach described here, and given in details ...
Week 7: Motor Control Basics
... Notice that you can short circuit power supply if you turn on the wrong switches MOSFET shoot-through ...
... Notice that you can short circuit power supply if you turn on the wrong switches MOSFET shoot-through ...
initial current reduction of synchronous motors with salient poles by
... operate on different surfaces during coal mining works. These machines are highly productive, operating 24 hours a day with the average life span of 40 years and have the lowest cost of material removal per unit. For the powering of the main generator group, which consists of three DC generators wit ...
... operate on different surfaces during coal mining works. These machines are highly productive, operating 24 hours a day with the average life span of 40 years and have the lowest cost of material removal per unit. For the powering of the main generator group, which consists of three DC generators wit ...
AUT 235 Motor Controls II - Alabama Community College System
... Condition Statement: Unless otherwise indicated, evaluation of student’s attainment of objectives is based on knowledge gained from this course. Specifications may be in the form of, but not limited to, cognitive skills diagnostic instruments, manufacturer’s specifications, technical orders, regulat ...
... Condition Statement: Unless otherwise indicated, evaluation of student’s attainment of objectives is based on knowledge gained from this course. Specifications may be in the form of, but not limited to, cognitive skills diagnostic instruments, manufacturer’s specifications, technical orders, regulat ...
Electric generator
... a drive motor 111 whereby the rotors 402 and 102 of both generators are rotatable in unison as indicated by arrow 110. Two batteries 120 and 420, in series with switches 121 and 421, are representative of means for arcs adds up to about 90° geometrical and electrical. supplying direct current to the ...
... a drive motor 111 whereby the rotors 402 and 102 of both generators are rotatable in unison as indicated by arrow 110. Two batteries 120 and 420, in series with switches 121 and 421, are representative of means for arcs adds up to about 90° geometrical and electrical. supplying direct current to the ...
A Novel Universal Sensor Concept for Survivable PMSM Drives Yao
... Another type of position sensorless technique is based on an electric machine’s back electromotive force (EMF) [8], [9]. The position vector can be estimated by integration of the back EMF. However, phase back EMF is usually not achievable in a machine drive system, because phase voltage is also aff ...
... Another type of position sensorless technique is based on an electric machine’s back electromotive force (EMF) [8], [9]. The position vector can be estimated by integration of the back EMF. However, phase back EMF is usually not achievable in a machine drive system, because phase voltage is also aff ...
Curso sobre sistemas trifsicos
... 1.73 x K x L x I L = Length of conductor in feet VD I = Current in conductor (amperes) CM = Circular mil area of conductor ...
... 1.73 x K x L x I L = Length of conductor in feet VD I = Current in conductor (amperes) CM = Circular mil area of conductor ...
ATM 215 Motor Controls II - Alabama Community College System
... Condition Statement: Unless otherwise indicated, evaluation of student’s attainment of objectives is based on knowledge gained from this course. Specifications may be in the form of, but not limited to, cognitive skills diagnostic instruments, manufacturer’s specifications, technical orders, regulat ...
... Condition Statement: Unless otherwise indicated, evaluation of student’s attainment of objectives is based on knowledge gained from this course. Specifications may be in the form of, but not limited to, cognitive skills diagnostic instruments, manufacturer’s specifications, technical orders, regulat ...
Chapter 4
... energized (magnetized) de-energized (demagnetized) Power relay (contactor) or control relay (relay) Power relay Uses a small amount of voltage to control a large amount ...
... energized (magnetized) de-energized (demagnetized) Power relay (contactor) or control relay (relay) Power relay Uses a small amount of voltage to control a large amount ...
DA33612620
... rotor is required to determine the next commutation interval. Motor can also be controlled by controlling the DC bus rail voltage or by PWM method. Some designs utilize both to provide high torque at high load and high efficiency at low load. Such hybrid design also allows the control of harmonic cu ...
... rotor is required to determine the next commutation interval. Motor can also be controlled by controlling the DC bus rail voltage or by PWM method. Some designs utilize both to provide high torque at high load and high efficiency at low load. Such hybrid design also allows the control of harmonic cu ...
V/F control
... When Squirrel cage induction machine is operated directly from the line voltages(60 Hz/50 Hz essentially constant voltage) an Induction motor is operated at constant speed. However in the industry we required to vary the speed of an Induction motor. This can be done by Induction motor drives. Main a ...
... When Squirrel cage induction machine is operated directly from the line voltages(60 Hz/50 Hz essentially constant voltage) an Induction motor is operated at constant speed. However in the industry we required to vary the speed of an Induction motor. This can be done by Induction motor drives. Main a ...
AVR496: Brushless DC Motor Control using
... Brushless DC motors are used in a growing number of motor applications as they have many advantages: They have no brushes so they require little or no maintenance. They generate less acoustic and electrical noise than universal brushed DC motors. They can be used in hazardous operation environments ...
... Brushless DC motors are used in a growing number of motor applications as they have many advantages: They have no brushes so they require little or no maintenance. They generate less acoustic and electrical noise than universal brushed DC motors. They can be used in hazardous operation environments ...
Electric motor
An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator.In normal motoring mode, most electric motors operate through the interaction between an electric motor's magnetic field and winding currents to generate force within the motor. In certain applications, such as in the transportation industry with traction motors, electric motors can operate in both motoring and generating or braking modes to also produce electrical energy from mechanical energy.Found in applications as diverse as industrial fans, blowers and pumps, machine tools, household appliances, power tools, and disk drives, electric motors can be powered by direct current (DC) sources, such as from batteries, motor vehicles or rectifiers, or by alternating current (AC) sources, such as from the power grid, inverters or generators. Small motors may be found in electric watches. General-purpose motors with highly standardized dimensions and characteristics provide convenient mechanical power for industrial use. The largest of electric motors are used for ship propulsion, pipeline compression and pumped-storage applications with ratings reaching 100 megawatts. Electric motors may be classified by electric power source type, internal construction, application, type of motion output, and so on.Electric motors are used to produce linear or rotary force (torque), and should be distinguished from devices such as magnetic solenoids and loudspeakers that convert electricity into motion but do not generate usable mechanical powers, which are respectively referred to as actuators and transducers.