Group Motor Protection
... Typically, group motor installations protected by one branch circuit OCPD and group switching are considered for cost savings. However, caution should be taken where a conductor is expected to be protected by an overcurrent protective device significantly greater than the conductor ampacity. The NEC ...
... Typically, group motor installations protected by one branch circuit OCPD and group switching are considered for cost savings. However, caution should be taken where a conductor is expected to be protected by an overcurrent protective device significantly greater than the conductor ampacity. The NEC ...
Spare parts, installation and maintenance of ac motors
... 20 ensure the feet are fully in contact with the machined faces. Tighten all bolts to the torque given on page 17 ...
... 20 ensure the feet are fully in contact with the machined faces. Tighten all bolts to the torque given on page 17 ...
Motors on Variable Frequency Drives
... NMC’s INVERTER GRADE® insulation system is the first line of defense against corona and phase to phase faults that can be common when a motor is powered using a PWM waveform. The INVERTER GRADE® insulation system is standard on all of NMC’s Inverter Duty products. Along with the INVERTER GRADE® insu ...
... NMC’s INVERTER GRADE® insulation system is the first line of defense against corona and phase to phase faults that can be common when a motor is powered using a PWM waveform. The INVERTER GRADE® insulation system is standard on all of NMC’s Inverter Duty products. Along with the INVERTER GRADE® insu ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
... Induction motors are widely used in industrial and domestic applications due to their simple construction, low cost, high robustness and higher efficiency. In the earlier days the induction motors are used for constant speed applications. With the revolution of high speed power semiconductor devises ...
... Induction motors are widely used in industrial and domestic applications due to their simple construction, low cost, high robustness and higher efficiency. In the earlier days the induction motors are used for constant speed applications. With the revolution of high speed power semiconductor devises ...
HA2312001206
... indirectly using d-axis current. This method does not require pulse width modulation and proportional plus integral regulators and also permits the regulation of varying signals. not feasible. In the literature, several methods have been proposed for BLDC motor drives to obtain optimum current and t ...
... indirectly using d-axis current. This method does not require pulse width modulation and proportional plus integral regulators and also permits the regulation of varying signals. not feasible. In the literature, several methods have been proposed for BLDC motor drives to obtain optimum current and t ...
Split-phase electric power - University of Utah Physics
... This is a three-phase 240 V delta connected system, in which one winding of the transformer has a center tap which is connected to ground and used as the system neutral. This allows a single service to supply 120 V for lighting, 240 V single-phase for heating appliances, and 240 V three-phase for mo ...
... This is a three-phase 240 V delta connected system, in which one winding of the transformer has a center tap which is connected to ground and used as the system neutral. This allows a single service to supply 120 V for lighting, 240 V single-phase for heating appliances, and 240 V three-phase for mo ...
Position Sensorless Control Based on Coordinate Transformation
... of the open-circuit field [21] and may distort the motor air-gap magnetic field excited by PM. 2) Error Caused by the Low-Pass Filters: Usually, the terminal or phase voltages are used instead for sensorless control, as the back EMF is difficult to be detected directly. The terminal voltage is the c ...
... of the open-circuit field [21] and may distort the motor air-gap magnetic field excited by PM. 2) Error Caused by the Low-Pass Filters: Usually, the terminal or phase voltages are used instead for sensorless control, as the back EMF is difficult to be detected directly. The terminal voltage is the c ...
An adaptive high speed PMSM control for electric vehicle application
... best and efficient one that can be used in this application. In [1], Zhu was established a comparative study between, the Brushless DC motor, induction motor, switching reluctance motor and the permanent magnet synchronous motor. However, the Permanent Magnet Synchronous Motors (PMSM) drives are the ...
... best and efficient one that can be used in this application. In [1], Zhu was established a comparative study between, the Brushless DC motor, induction motor, switching reluctance motor and the permanent magnet synchronous motor. However, the Permanent Magnet Synchronous Motors (PMSM) drives are the ...
Introduction, Features and Applications
... Introduction, Features and Applications Introduction The KL-8078 are high performance microstepping drivers based on one of the most advanced technologies in the world today. They are suitable for driving 2-phase and 4-phase hybrid stepping motors. By using advanced bipolar constant-current chopping ...
... Introduction, Features and Applications Introduction The KL-8078 are high performance microstepping drivers based on one of the most advanced technologies in the world today. They are suitable for driving 2-phase and 4-phase hybrid stepping motors. By using advanced bipolar constant-current chopping ...
unit-2: dc motor
... 14. A 3Φ, 50 Hz, star connected salient pole alternator has 216 slots with 5 conductors per slot. All the conductors of each phase are connected in series; the winding is distributed and full pitched. The flux per pole is 30 mwb and the alternator runs at 250 rpm. Determine the phase and line voltag ...
... 14. A 3Φ, 50 Hz, star connected salient pole alternator has 216 slots with 5 conductors per slot. All the conductors of each phase are connected in series; the winding is distributed and full pitched. The flux per pole is 30 mwb and the alternator runs at 250 rpm. Determine the phase and line voltag ...
ii. structure of the power chain - International Journal of Scientific
... angular velocity of the motor. The holding time of the electric current speed of a maximum (corresponding to 120 electrical degrees) is given by the following expression [2], [8] and [9]: ...
... angular velocity of the motor. The holding time of the electric current speed of a maximum (corresponding to 120 electrical degrees) is given by the following expression [2], [8] and [9]: ...
cv - ANA-DIGI SYSTEMS
... and permanently guarded against accidental contact while the motor is running. Care must be taken to ensure fixing bolts are correctly tightened. It is recommended that a flat washer and a spring washer are used to prevent too much stress on the foot or flange of the motor, and to prevent fixing bol ...
... and permanently guarded against accidental contact while the motor is running. Care must be taken to ensure fixing bolts are correctly tightened. It is recommended that a flat washer and a spring washer are used to prevent too much stress on the foot or flange of the motor, and to prevent fixing bol ...
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.