Self -Excited DC Motor
... It consists of slotted soft-iron laminations (about 0.4 to 0.6 mm thick) that are stacked to form a cylindrical core as shown in Fig. The laminations (See Fig.) are individually coated with a thin insulating film so that they do not come in electrical contact with each other. The purpose of laminati ...
... It consists of slotted soft-iron laminations (about 0.4 to 0.6 mm thick) that are stacked to form a cylindrical core as shown in Fig. The laminations (See Fig.) are individually coated with a thin insulating film so that they do not come in electrical contact with each other. The purpose of laminati ...
LAB#8 - SIUE
... Explain how to locate the neutral brush position in a dc motor. Would the motor turn if only the armature were excited (had voltage applied across it?) Why is it dangerous to supply power to an unloaded series connected dc motor? In what two ways may the rotation of a series connected dc motor be re ...
... Explain how to locate the neutral brush position in a dc motor. Would the motor turn if only the armature were excited (had voltage applied across it?) Why is it dangerous to supply power to an unloaded series connected dc motor? In what two ways may the rotation of a series connected dc motor be re ...
Technical Data Sheet HCI634H - Winding 311 and 312
... incorporated into the Stamford Permanent Magnet Generator (PMG) system and is fitted as standard to generators of this type. The PMG provides power via the AVR to the main exciter, giving a source of constant excitation power independent of generator output. The main exciter output is then fed to th ...
... incorporated into the Stamford Permanent Magnet Generator (PMG) system and is fitted as standard to generators of this type. The PMG provides power via the AVR to the main exciter, giving a source of constant excitation power independent of generator output. The main exciter output is then fed to th ...
Document for safety precautions
... precautions. These three effects are shock, heating and sparking ELECTRIC SHOCK The body experiences electric shock when electric current passes through it. Contact with a wire carrying a high voltage can give a person severe, sometimes fatal shock. When a strong current passes through the body, the ...
... precautions. These three effects are shock, heating and sparking ELECTRIC SHOCK The body experiences electric shock when electric current passes through it. Contact with a wire carrying a high voltage can give a person severe, sometimes fatal shock. When a strong current passes through the body, the ...
Digital Control of Permanent Magnet Synchronous Motors
... 2. Permanent magnet synchronous motors As with most motors the synchronous motor (SM) has two primary parts. The non-moving is called the stator and the moving — usually inside the stator — is called the rotor. Synchronous motors can be built in different structures. To enable a motor to rotate two ...
... 2. Permanent magnet synchronous motors As with most motors the synchronous motor (SM) has two primary parts. The non-moving is called the stator and the moving — usually inside the stator — is called the rotor. Synchronous motors can be built in different structures. To enable a motor to rotate two ...
Tutorial final Questions
... operates at switching frequency, fsw of 1kHz to supply a series DC motor. This chopper is designed to produce output voltage 90% of the input voltage and the chopper operates at fourth quadrant. The motor resistance (Ra) 0.50 and motor inductance (La) 3mH. The machine emf back is 80V and emf back ...
... operates at switching frequency, fsw of 1kHz to supply a series DC motor. This chopper is designed to produce output voltage 90% of the input voltage and the chopper operates at fourth quadrant. The motor resistance (Ra) 0.50 and motor inductance (La) 3mH. The machine emf back is 80V and emf back ...
Modelling of Single-Phase Induction Motor with External
... -jω(Φex + 2Σ Φσrx )= 2Re Iexwww.technologyfuturae.com ...
... -jω(Φex + 2Σ Φσrx )= 2Re Iexwww.technologyfuturae.com ...
Free Feature Article
... motors, such as induction off. For a given coil current, 60 Hz power grid line motors, are “semi-synchrothe magnetic pull against frequency was by far nous” in that their speed the most accurate the armature changes radifrequency standard depends on both the line cally with distance. For frequency a ...
... motors, such as induction off. For a given coil current, 60 Hz power grid line motors, are “semi-synchrothe magnetic pull against frequency was by far nous” in that their speed the most accurate the armature changes radifrequency standard depends on both the line cally with distance. For frequency a ...
Rotor side Control of High Power Slip Ring Induction Motor using a
... A single phase induction motor is not self-starting. Thus, it is necessary to provide a starting circuit and associated start windings to give the initial rotation in a single phase induction motor. The normal running windings within such a motor can cause the rotor to turn in either direction, so t ...
... A single phase induction motor is not self-starting. Thus, it is necessary to provide a starting circuit and associated start windings to give the initial rotation in a single phase induction motor. The normal running windings within such a motor can cause the rotor to turn in either direction, so t ...
... The phenomenon of voltages and currents on motor and generator shafts has been known for the past 100 years. It affects motors, hydro generators and turbo generators. There has been an increase in occurrences and intensity of shaft current damages as machines became larger, particularly on high spee ...
150Lecture 7 Magnetism/Electromagnetism Lecture Notes Page
... CURRENTS ARE FLOWING IN THE SAME DIRECTION.( F7-10 P.178) THE FIELD LINES JOIN TOGETHER. THE OPPOSITE OCCURS IF CURRENTS ARE TRAVELING IN THE OPPOSITE ...
... CURRENTS ARE FLOWING IN THE SAME DIRECTION.( F7-10 P.178) THE FIELD LINES JOIN TOGETHER. THE OPPOSITE OCCURS IF CURRENTS ARE TRAVELING IN THE OPPOSITE ...
Test #2 - tech
... ____ 12. Which of the following does NOT convert pressure into a force a. bellows c. diaphragm b. bi-metallic strip d. bourdon tube ____ 13. To convert the deformation of a diaphragm into an electrical signal a ___________ is often used a. thermistor c. silicone device b. switch d. strain gauge ____ ...
... ____ 12. Which of the following does NOT convert pressure into a force a. bellows c. diaphragm b. bi-metallic strip d. bourdon tube ____ 13. To convert the deformation of a diaphragm into an electrical signal a ___________ is often used a. thermistor c. silicone device b. switch d. strain gauge ____ ...
Motors and Generators #2
... Forces on the sides ab and cd: Experience maximum force since the current in them is perpendicular to the magnetic field Magnitude of the force does not change throughout its rotation Using the right hand palm rule, the direction of the force on sides ab and cd can be deduced The net result ...
... Forces on the sides ab and cd: Experience maximum force since the current in them is perpendicular to the magnetic field Magnitude of the force does not change throughout its rotation Using the right hand palm rule, the direction of the force on sides ab and cd can be deduced The net result ...
Commutator (electric)
A commutator is the moving part of a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine. The commutator is one component of a motor; there are also two or more stationary electrical contacts called ""brushes"" made of a soft conductor like carbon press against the commutator, making sliding contact with successive segments of the commutator as it rotates. The windings (coils of wire) on the armature are connected to the commutator segments. Commutators are used in direct current (DC) machines: dynamos (DC generators) and many DC motors as well as universal motors. In a motor the commutator applies electric current to the windings. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced. In a generator the commutator picks off the current generated in the windings, reversing the direction of the current with each half turn, serving as a mechanical rectifier to convert the alternating current from the windings to unidirectional direct current in the external load circuit. The first direct current commutator-type machine, the dynamo, was built by Hippolyte Pixii in 1832, based on a suggestion by André-Marie Ampère. Commutators are relatively inefficient, and also require periodic maintenance such as brush replacement. Therefore, commutated machines are declining in use, being replaced by alternating current (AC) machines, and in recent years by brushless DC motors which use semiconductor switches.