Lesson 33 electrical repair work
... Cables are to be checked for signs of burning or deterioration. Cleaning of the switchboard is to be done with dry compressed air and/or vacuum cleaner. Chemical solvents should not be used. After cleaning all moving parts are to be carefully lubricated. ...
... Cables are to be checked for signs of burning or deterioration. Cleaning of the switchboard is to be done with dry compressed air and/or vacuum cleaner. Chemical solvents should not be used. After cleaning all moving parts are to be carefully lubricated. ...
Application Note: Sizing Three-Phase Inverters for Single
... input of the drive if an oversized inverter were not used. Furthermore, full-wave rectified single-phase power has a much higher harmonic content than full-wave rectified threephase power. This would introduce large ripple into the DC bus of the inverter, potentially causing other malfunctions. Larg ...
... input of the drive if an oversized inverter were not used. Furthermore, full-wave rectified single-phase power has a much higher harmonic content than full-wave rectified threephase power. This would introduce large ripple into the DC bus of the inverter, potentially causing other malfunctions. Larg ...
Press Applications: eddy-current vs VFDs
... 26 x 1.1 = 28.6 (round up to 30 hp). A VFD and/or DC drive typically can provide only 150-percent overload, so drive size would be: 65/1.50 = 43.33 hp (about 50 hp when accounting for frictional and gear losses. That’s right, a 20-hp difference, because eddy-current drives can generate 250 percent, ...
... 26 x 1.1 = 28.6 (round up to 30 hp). A VFD and/or DC drive typically can provide only 150-percent overload, so drive size would be: 65/1.50 = 43.33 hp (about 50 hp when accounting for frictional and gear losses. That’s right, a 20-hp difference, because eddy-current drives can generate 250 percent, ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
... response. This type of fault may result the disconnection of the semiconductor due to lifting of bonding wires caused by thermic cycling or due to a problem in the gate control signal [3]. This kind of failure does not necessarily cause the system shutdown and can remain undetected for an extended p ...
... response. This type of fault may result the disconnection of the semiconductor due to lifting of bonding wires caused by thermic cycling or due to a problem in the gate control signal [3]. This kind of failure does not necessarily cause the system shutdown and can remain undetected for an extended p ...
Introduction to BLDC Motor Control - Renesas e
... BLDC Motor Speed Control The goal of most Electronic Motor Control Systems is Speed Control Speed Control systems are more or less complicated, depending on accuracy required The simplest speed control is Open-Loop, that is, without speed feedback In this configuration, a speed command is c ...
... BLDC Motor Speed Control The goal of most Electronic Motor Control Systems is Speed Control Speed Control systems are more or less complicated, depending on accuracy required The simplest speed control is Open-Loop, that is, without speed feedback In this configuration, a speed command is c ...
January 15, 2008
... – Servo signal adjusts between low and high throttle (1ms and 2 ms) – Places a test load of 500 mA on BEC circuit ...
... – Servo signal adjusts between low and high throttle (1ms and 2 ms) – Places a test load of 500 mA on BEC circuit ...
5-13. Magnet Field
... 5-6. Conductors and Insulators A conductor is a substance through which electric charge flows readily. An insulator is a substance that strongly resists the flow of electric charge. Semiconductors are substances whose electrical conductivity is between that of conductors and insulators. ...
... 5-6. Conductors and Insulators A conductor is a substance through which electric charge flows readily. An insulator is a substance that strongly resists the flow of electric charge. Semiconductors are substances whose electrical conductivity is between that of conductors and insulators. ...
D3000 1.4 - Electromagnetic Devices-1
... * Note that separate test instruments are not needed if the D3000 VIP is used, as all required test equipment is provided in the form of on-screen ‘virtual’ instruments. If a D3000 VIP is used, or if the study module is to be used in a ClassAct computer managed learning environment, then a student P ...
... * Note that separate test instruments are not needed if the D3000 VIP is used, as all required test equipment is provided in the form of on-screen ‘virtual’ instruments. If a D3000 VIP is used, or if the study module is to be used in a ClassAct computer managed learning environment, then a student P ...
Mutual / Self-Induction * Learning Outcomes
... Mutual induction occurs when two coils are adjacent to each other. If the magnetic field in one coil changes, an emf is induced in the other. This happens with a.c. The size of the induced emf depends on: the distance between the coils (closer yields more emf), whether the coils have the sam ...
... Mutual induction occurs when two coils are adjacent to each other. If the magnetic field in one coil changes, an emf is induced in the other. This happens with a.c. The size of the induced emf depends on: the distance between the coils (closer yields more emf), whether the coils have the sam ...
Voltage Stability Assessment and Enhancement of a Large Power
... Dr. Jennie Si Abstract Voltage instability initiated by induction motor dynamics has been an important issue in power system operation. The voltage instability in a power system having significant induction motor loads can be manifested either in the form of delayed voltage recovery or in the form o ...
... Dr. Jennie Si Abstract Voltage instability initiated by induction motor dynamics has been an important issue in power system operation. The voltage instability in a power system having significant induction motor loads can be manifested either in the form of delayed voltage recovery or in the form o ...
Tucson Electric Power Company Rules and Regulations
... Allowable Instantaneous Starting Current Values: The instantaneous starting current (determined by tests or based on limits guaranteed by manufacturers) drawn from the line by any motor must not exceed a value (as determined by the Company) that may be deemed detrimental to the normal operation of t ...
... Allowable Instantaneous Starting Current Values: The instantaneous starting current (determined by tests or based on limits guaranteed by manufacturers) drawn from the line by any motor must not exceed a value (as determined by the Company) that may be deemed detrimental to the normal operation of t ...
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.