IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331,
... directly controlled variables are the torque and rotor flux. Fig. 5 shows that the control strategy is divided into five different tasks represented in seven different blocks. The tasks carried out in blocks 1–5 are the DTC principles formulated in [11] and are estimable according to equations (1)-( ...
... directly controlled variables are the torque and rotor flux. Fig. 5 shows that the control strategy is divided into five different tasks represented in seven different blocks. The tasks carried out in blocks 1–5 are the DTC principles formulated in [11] and are estimable according to equations (1)-( ...
Motors and loads - Schneider Electric
... This has two concentric cages, one outside, of small section and fairly high resistance, and one inside, of high section and lower resistance. - On first starting, the rotor current frequency is high and the resulting skin effect causes the entire rotor current to circulate round the edge of the rot ...
... This has two concentric cages, one outside, of small section and fairly high resistance, and one inside, of high section and lower resistance. - On first starting, the rotor current frequency is high and the resulting skin effect causes the entire rotor current to circulate round the edge of the rot ...
PARMENANT MAGNET SYNCHRONOUS GENERATOR
... is produced by permanent magnets. Other types of generator use electromagnets to produce a magnetic field in a rotor winding. The direct current in the rotor field winding is fed through a slipring assembly or provided by a brushless exciter on the same shaft ...
... is produced by permanent magnets. Other types of generator use electromagnets to produce a magnetic field in a rotor winding. The direct current in the rotor field winding is fed through a slipring assembly or provided by a brushless exciter on the same shaft ...
12.6 The Direct Current Motor
... needle are forced back in the opposite direction once the coiled conductor has rotated past the halfway point. Scientists wanted to find a way to temporarily interrupt the current and then change its direction, and thus the direction of the magnetic field. One simple but ingenious idea was to create ...
... needle are forced back in the opposite direction once the coiled conductor has rotated past the halfway point. Scientists wanted to find a way to temporarily interrupt the current and then change its direction, and thus the direction of the magnetic field. One simple but ingenious idea was to create ...
Analogical Modelling and Numerical Simulation of the Single
... and when the angle α is 90° or 270° it has a minimum one, which depends on fα. Figure 4b shows that the u2 voltage amplitude decreases when the angle α is approaching to 450° (a complete revolution). In this graph the amplitude of the u2 voltage was increased by 100 times, so it can be observed the ...
... and when the angle α is 90° or 270° it has a minimum one, which depends on fα. Figure 4b shows that the u2 voltage amplitude decreases when the angle α is approaching to 450° (a complete revolution). In this graph the amplitude of the u2 voltage was increased by 100 times, so it can be observed the ...
Document
... produce a rotating magnetic field (as in a three-phase synchronous motor) – a stationary conductor will see a varying magnetic field and this will induce a current – current is induced in the field coils in the same way that current is induced in the secondary of a transformer – this current turns t ...
... produce a rotating magnetic field (as in a three-phase synchronous motor) – a stationary conductor will see a varying magnetic field and this will induce a current – current is induced in the field coils in the same way that current is induced in the secondary of a transformer – this current turns t ...
B.E 3/4 - II Semester
... University Examination 50Marks Sessional 25 Marks LIST OF EXPERIMENTS: 1. Three phase to Two phase conversion (Scott connection). 2. Heat run test on Three phase transformer. 3. No-load test blocked rotor test and load test on 3-phase Induction motor. 4. Speed control of Three phase Induction motor ...
... University Examination 50Marks Sessional 25 Marks LIST OF EXPERIMENTS: 1. Three phase to Two phase conversion (Scott connection). 2. Heat run test on Three phase transformer. 3. No-load test blocked rotor test and load test on 3-phase Induction motor. 4. Speed control of Three phase Induction motor ...
DC generators
... produce a rotating magnetic field (as in a three-phase synchronous motor) – a stationary conductor will see a varying magnetic field and this will induce a current – current is induced in the field coils in the same way that current is induced in the secondary of a transformer – this current turns t ...
... produce a rotating magnetic field (as in a three-phase synchronous motor) – a stationary conductor will see a varying magnetic field and this will induce a current – current is induced in the field coils in the same way that current is induced in the secondary of a transformer – this current turns t ...
Microcontroller based PWM Inverter for Speed Control of a Three
... productivity and higher quality of most of the industrial products that we used in our everyday lives means that all aspect of dynamic response and accuracy of motor drives have to be inc reased. Issue of energy efficiency and harmonics proliferation into the supply grid are also increasingly affect ...
... productivity and higher quality of most of the industrial products that we used in our everyday lives means that all aspect of dynamic response and accuracy of motor drives have to be inc reased. Issue of energy efficiency and harmonics proliferation into the supply grid are also increasingly affect ...
style guidelines to assist authors preparing papers using ms word
... severe supply voltage dip, the motor’s contribution to the fault causes both the rotor and stator current to increase rapidly to as high as six to ten times rated current. Thus, for a close – in stator short circuit, in addition to the converter being unable to extract power from the dc link and ret ...
... severe supply voltage dip, the motor’s contribution to the fault causes both the rotor and stator current to increase rapidly to as high as six to ten times rated current. Thus, for a close – in stator short circuit, in addition to the converter being unable to extract power from the dc link and ret ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331,
... Induction motors are most widely used in all industries. The speed of the induction motor has to be varied according to application requirement [1], [3]. So it is necessary to control the speed of induction motor efficiently. The speed of the motor can be measured using sensor or speed can be estima ...
... Induction motors are most widely used in all industries. The speed of the induction motor has to be varied according to application requirement [1], [3]. So it is necessary to control the speed of induction motor efficiently. The speed of the motor can be measured using sensor or speed can be estima ...
Electronics Aspect - Personal Web Pages
... ii. The circuit also has a 7812 and 7805 voltage regulator for 12V and 5V supply. iii. The motors were run at 12V and the 5V signals were used for reference required by the chip and for testing purposes. iv. Every LMD can be used to operate a single motor at 15 different speed levels and in both dir ...
... ii. The circuit also has a 7812 and 7805 voltage regulator for 12V and 5V supply. iii. The motors were run at 12V and the 5V signals were used for reference required by the chip and for testing purposes. iv. Every LMD can be used to operate a single motor at 15 different speed levels and in both dir ...
View - The IJST
... generates very high common mode voltage and high frequency noise. So we need voltage dividers and low pass filters to reduce the common mode voltage and smooth the high frequency noise, For instance, if the dc bus voltage is 300 V, the potential of the neutral point can vary from zero to 300 V. The ...
... generates very high common mode voltage and high frequency noise. So we need voltage dividers and low pass filters to reduce the common mode voltage and smooth the high frequency noise, For instance, if the dc bus voltage is 300 V, the potential of the neutral point can vary from zero to 300 V. The ...
pub3241bvariablefrequencydrives
... of the motor will attempt to follow. The load on the motor, however, causes the rotor speed to slip slightly behind the rotating field speed. Induction motors rotate close to synchronous speed. The most effective and energy efficient way to alter the speed of the motor is to change the frequency of ...
... of the motor will attempt to follow. The load on the motor, however, causes the rotor speed to slip slightly behind the rotating field speed. Induction motors rotate close to synchronous speed. The most effective and energy efficient way to alter the speed of the motor is to change the frequency of ...
DC-machines
... adding a variable resistance in series with the armature Potential divider control : If the speed control from zero to the rated speed is required , by rheostatic method then the voltage across the armature can be varied by connecting rheostat in a potential divider arrangement . ...
... adding a variable resistance in series with the armature Potential divider control : If the speed control from zero to the rated speed is required , by rheostatic method then the voltage across the armature can be varied by connecting rheostat in a potential divider arrangement . ...
pub3241bvariablefrequencydrives
... of the motor will attempt to follow. The load on the motor, however, causes the rotor speed to slip slightly behind the rotating field speed. Induction motors rotate close to synchronous speed. The most effective and energy efficient way to alter the speed of the motor is to change the frequency of ...
... of the motor will attempt to follow. The load on the motor, however, causes the rotor speed to slip slightly behind the rotating field speed. Induction motors rotate close to synchronous speed. The most effective and energy efficient way to alter the speed of the motor is to change the frequency of ...
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.