Power electronics in ship propulsion electronic motors
... The line side converter takes power from a constant frequency (60 Hz) bus and produces a controlled DC voltage called DC link, on the same way as SCR - DC drive converter. In order to assure the appropriate induced voltage at the motor terminals, which is necessary to turn off the inverter thyrist ...
... The line side converter takes power from a constant frequency (60 Hz) bus and produces a controlled DC voltage called DC link, on the same way as SCR - DC drive converter. In order to assure the appropriate induced voltage at the motor terminals, which is necessary to turn off the inverter thyrist ...
ANALYSIS & MODELING OF HYSTERESIS MOTORS
... It has a very low noise level compared to single-phase induction motor because it operates at one speed(synchronous)and its rotor is smooth. With a permanent capacitor stator, hysteresis motor is the smoothest running, quietest single phase motor and is preferred for quality sound reproduction equip ...
... It has a very low noise level compared to single-phase induction motor because it operates at one speed(synchronous)and its rotor is smooth. With a permanent capacitor stator, hysteresis motor is the smoothest running, quietest single phase motor and is preferred for quality sound reproduction equip ...
Visualization and Animation of Inverter
... driven induction motor that enables direct animation and visualization of the inverter and motor operation. The models of the inverter and induction motor are physically based model in actual quantities. As such they enable direct animation and visualization of the operation of the inverterdriven in ...
... driven induction motor that enables direct animation and visualization of the inverter and motor operation. The models of the inverter and induction motor are physically based model in actual quantities. As such they enable direct animation and visualization of the operation of the inverterdriven in ...
03_AC Machines
... DC currents flowing in the field coils surrounding each pole magnetize the rotor poles. The magnetic field produced by the rotor poles locks in with a rotating stator field, so that the shaft and the stator field rotate in synchronism. Salient poles are too weak mechanically and develop too mu ...
... DC currents flowing in the field coils surrounding each pole magnetize the rotor poles. The magnetic field produced by the rotor poles locks in with a rotating stator field, so that the shaft and the stator field rotate in synchronism. Salient poles are too weak mechanically and develop too mu ...
開啟檔案
... application which requires that its operating frequency be reduced from 60 to 50Hz. This application requires that , for the operating condition considered in Problem 4.8, the rms generated voltage equal 13.0 kV line-to-line. As a result, the machine armature must be rewound with a different ...
... application which requires that its operating frequency be reduced from 60 to 50Hz. This application requires that , for the operating condition considered in Problem 4.8, the rms generated voltage equal 13.0 kV line-to-line. As a result, the machine armature must be rewound with a different ...
Induction Motor and Self-Excited Induction Generator
... Biographical Sketch Tze-Fun Chan received the B.Sc.(Eng.) and M.Phil. degrees in electrical engineering from the University of Hong Kong in 1974 and 1980. Since 1978, Mr. Chan has been with the Department of Electrical Engineering of the Hong Kong Polytechnic University, where he is now an Associate ...
... Biographical Sketch Tze-Fun Chan received the B.Sc.(Eng.) and M.Phil. degrees in electrical engineering from the University of Hong Kong in 1974 and 1980. Since 1978, Mr. Chan has been with the Department of Electrical Engineering of the Hong Kong Polytechnic University, where he is now an Associate ...
Circle Diagram for Three Phase Induction Motors
... Block the rotor firmly and apply a reduced voltage to obtain rated current at the motor terminals. Observe the supply line voltage VSC, No-load line current ISC and no-load power PSC. Phase angle for blocked rotor condition Φ SC = ...
... Block the rotor firmly and apply a reduced voltage to obtain rated current at the motor terminals. Observe the supply line voltage VSC, No-load line current ISC and no-load power PSC. Phase angle for blocked rotor condition Φ SC = ...
Special-Purpose Motors
... • However, the operation differs mainly in the complicated control mechanism of the motor. • In order to develop torque in the motor, the rotor position should be determined by sensors so that the excitation timing of the phase windings is precise. • Although its construction is one of the simplest ...
... • However, the operation differs mainly in the complicated control mechanism of the motor. • In order to develop torque in the motor, the rotor position should be determined by sensors so that the excitation timing of the phase windings is precise. • Although its construction is one of the simplest ...
MATLAB Simulation for Speed Control of Three Phase Induction
... Low cost, high efficiency, high robustness, reliability and low maintenance are some the advantages of the induction motors over DC motors. When mechanical loads are changed the speed characteristics for induction motor also changes. The induction motors do not have the constant speed characteristic ...
... Low cost, high efficiency, high robustness, reliability and low maintenance are some the advantages of the induction motors over DC motors. When mechanical loads are changed the speed characteristics for induction motor also changes. The induction motors do not have the constant speed characteristic ...
AC Generators I Notes
... d. Understand the effects of applying a DC voltage power supply to a two pole rotor's field windings via brushes and slip rings e. Understand the induced effects that result from rotating the rotor's electromagnetic field past the armatures (Faraday's Law) f. Given the armature coil sequence and the ...
... d. Understand the effects of applying a DC voltage power supply to a two pole rotor's field windings via brushes and slip rings e. Understand the induced effects that result from rotating the rotor's electromagnetic field past the armatures (Faraday's Law) f. Given the armature coil sequence and the ...
Micromouse Lecture #2 Power Motors Encoders
... Brushed motors take a DC signal So they are also known as DC motors ...
... Brushed motors take a DC signal So they are also known as DC motors ...
RB-Pol-266 200:1 Plastic Gearmotor 90 Degree Shaft
... This 200:1 gearbox with brushed DC motor has a low-current motor and provides power and speed that is comparable to an RC servo at a fraction of the cost. At 6 V, it has a free-run speed of 51 RPM and a stall torque of approximately 100 oz-in. This 200:1 plastic gearmotor (gearbox with brushed DC mo ...
... This 200:1 gearbox with brushed DC motor has a low-current motor and provides power and speed that is comparable to an RC servo at a fraction of the cost. At 6 V, it has a free-run speed of 51 RPM and a stall torque of approximately 100 oz-in. This 200:1 plastic gearmotor (gearbox with brushed DC mo ...
in Word Doc Format
... (D) is in phase opposition to that of flux. Ans: C Q.18 The relative speed between the magnetic fields of stator and rotor under steady state operation is zero for a (A) dc machine. (B) 3 phase induction machine. (C) synchronous machine. (D) single phase induction machine. Ans: all options are corre ...
... (D) is in phase opposition to that of flux. Ans: C Q.18 The relative speed between the magnetic fields of stator and rotor under steady state operation is zero for a (A) dc machine. (B) 3 phase induction machine. (C) synchronous machine. (D) single phase induction machine. Ans: all options are corre ...
ELECTRIC MOTOR
... cleaners, and hair dryers where high-speed operation is desired. Many vacuum cleaner and weed trimmer motors will exceed 10,000 RPM, Dremel and other similar miniature grinders will often exceed 30,000 RPM. A universal motor allowed to operate with no mechanical load will overspeed, which may damage ...
... cleaners, and hair dryers where high-speed operation is desired. Many vacuum cleaner and weed trimmer motors will exceed 10,000 RPM, Dremel and other similar miniature grinders will often exceed 30,000 RPM. A universal motor allowed to operate with no mechanical load will overspeed, which may damage ...
Water System Capacity
... Why Is This Important? During design, we can avoid using fittings and materials with high friction losses Bottom line – SAVING $$$$$$$ ! ...
... Why Is This Important? During design, we can avoid using fittings and materials with high friction losses Bottom line – SAVING $$$$$$$ ! ...
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.