Read more... - Wieland Electric
... Although these last two motor types theoretically have no permanent magnet on the rotor to generate a magnetic field, in practice the magnetic fields generated during the operation of the motor create a permanent low magnetization of the motor. When power is removed, there are still sufficiently la ...
... Although these last two motor types theoretically have no permanent magnet on the rotor to generate a magnetic field, in practice the magnetic fields generated during the operation of the motor create a permanent low magnetization of the motor. When power is removed, there are still sufficiently la ...
Doubly fed induction generator systems for wind turbines
... power (Table 1). It is anticipated that in the near future, power rating of wind turbines will increase further, especially in offshore applications. For example, the prototype of a Nordex N80 with a rated power of 2.5 MW was installed in March 2000 near Aachen. Many low-power wind turbines built to ...
... power (Table 1). It is anticipated that in the near future, power rating of wind turbines will increase further, especially in offshore applications. For example, the prototype of a Nordex N80 with a rated power of 2.5 MW was installed in March 2000 near Aachen. Many low-power wind turbines built to ...
Electric Motor Comparison
... maximum output power and torque, speed regulation and power factor. Measurement of efficiency requires measurement of the power input to and output from the motor. Input power is easily determined for electric motors from the supplied voltage and current. Output power and torque are usually measured ...
... maximum output power and torque, speed regulation and power factor. Measurement of efficiency requires measurement of the power input to and output from the motor. Input power is easily determined for electric motors from the supplied voltage and current. Output power and torque are usually measured ...
PDF-file - Pentruder
... The speed of the motor refers to the rpms (revolutions per minute) of the shaft. For a three-phase AC motor the synchronous speed is: 120 x frequency measured in hertz or cycles per second, divided by the number of poles. The numbers of poles are a function of design. In the concrete cutting industr ...
... The speed of the motor refers to the rpms (revolutions per minute) of the shaft. For a three-phase AC motor the synchronous speed is: 120 x frequency measured in hertz or cycles per second, divided by the number of poles. The numbers of poles are a function of design. In the concrete cutting industr ...
ATE1120: Electrical Fundamental-II
... ATE1230: Electrical Machines Simple loop generator Figure 2.12 shows a single turn rectangular copper coil (AA′BB′ ) rotating about its own axis in a magnetic field provided by either permanent magnets or electromagnets. The two end of the coil are joined to two slip-rings which are insulated from ...
... ATE1230: Electrical Machines Simple loop generator Figure 2.12 shows a single turn rectangular copper coil (AA′BB′ ) rotating about its own axis in a magnetic field provided by either permanent magnets or electromagnets. The two end of the coil are joined to two slip-rings which are insulated from ...
Overload Currents
... temperature rise is trivial and has no harmful effect on the circuit components. (It is important that protective devices do not react to them.) Continuous overloads can result from defective motors (such as worn motor bearings), overloaded equipment, or too many loads on one circuit. Such sustained ...
... temperature rise is trivial and has no harmful effect on the circuit components. (It is important that protective devices do not react to them.) Continuous overloads can result from defective motors (such as worn motor bearings), overloaded equipment, or too many loads on one circuit. Such sustained ...
display
... Motor modules will be self-regulated The power distribution board will provide 5V and 12V to the PC104 stack Features: • Over current protection to onboard electronics • Voltage surge protection • Provide regulated aux outputs ( two 12Vdc and two 5Vdc line) • Its scalable by ‘stacking’ additional po ...
... Motor modules will be self-regulated The power distribution board will provide 5V and 12V to the PC104 stack Features: • Over current protection to onboard electronics • Voltage surge protection • Provide regulated aux outputs ( two 12Vdc and two 5Vdc line) • Its scalable by ‘stacking’ additional po ...
G3540
... Section-II presents description about the doubly fed induction generator. Section-III presents the dynamic simulation of doubly fed induction generator in terms of dq windings. Section-IV presents the control strategy adopted for the doubly fed induction generator. Then in Section-V, VI, VII present ...
... Section-II presents description about the doubly fed induction generator. Section-III presents the dynamic simulation of doubly fed induction generator in terms of dq windings. Section-IV presents the control strategy adopted for the doubly fed induction generator. Then in Section-V, VI, VII present ...
This is a very small, easy to use ultrasonic sensor that has three
... sensor is able to read at 20 Hz and reads in inch increments from 6 to 255. The only problem with this sensor is that there are some random extreme values, either a min or a max, that are difficult to filter out because each reading is a completely different point. It is very hard to distinguish whe ...
... sensor is able to read at 20 Hz and reads in inch increments from 6 to 255. The only problem with this sensor is that there are some random extreme values, either a min or a max, that are difficult to filter out because each reading is a completely different point. It is very hard to distinguish whe ...
Doubly-Fed Induction Generator Wind Turbine Model for Fault Ride-Through Investigation Yutana Chongjarearn
... The Doubly-Fed Induction Generator is widely used for large grid-connected, variable-speed wind turbines. Variable speed wind turbines offer a number of advantages [1] when compared with fixed-speed turbines, including operation over a wide range of wind velocities, independent control of active and r ...
... The Doubly-Fed Induction Generator is widely used for large grid-connected, variable-speed wind turbines. Variable speed wind turbines offer a number of advantages [1] when compared with fixed-speed turbines, including operation over a wide range of wind velocities, independent control of active and r ...
课程描述
... Introduction to Magnetic Circuits, sub topics, MMF, reluctance, permeability, inductance, flux linkage, magnetic pull; applications of above, magnetic lift and dc motors, simple equivalent circuits, in particular a simple linear motor and generator Faradays Law, Lenz’s Law, induced Voltage General a ...
... Introduction to Magnetic Circuits, sub topics, MMF, reluctance, permeability, inductance, flux linkage, magnetic pull; applications of above, magnetic lift and dc motors, simple equivalent circuits, in particular a simple linear motor and generator Faradays Law, Lenz’s Law, induced Voltage General a ...
Electrical Motor Starters
... therefore be unsuitable for star-delta starting. The starting conditions depend on the position of the tapping on the transformer winding, i.e. on the secondary voltage. Usually three or more tappings are provided so that there is a choice of starting conditions such as 40, 60 or 75% of line voltage ...
... therefore be unsuitable for star-delta starting. The starting conditions depend on the position of the tapping on the transformer winding, i.e. on the secondary voltage. Usually three or more tappings are provided so that there is a choice of starting conditions such as 40, 60 or 75% of line voltage ...
Notes 6
... – Two types: inductive and capacitive • Inductive senses ferrous and nonferrous metals • Inductive maximum sensing distance is 0.4 inches • Capacitive senses conductive and nonconductive ...
... – Two types: inductive and capacitive • Inductive senses ferrous and nonferrous metals • Inductive maximum sensing distance is 0.4 inches • Capacitive senses conductive and nonconductive ...
Motor Technologies
... increases, which gives rise to additional losses. Consideration of winding losses is very important since heating of the armature winding causes an increase in R, which results in further losses and heating. This process can destroy the motor if the maximum current is not limited. Furthermore, at hi ...
... increases, which gives rise to additional losses. Consideration of winding losses is very important since heating of the armature winding causes an increase in R, which results in further losses and heating. This process can destroy the motor if the maximum current is not limited. Furthermore, at hi ...
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.