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protective device for pumps / motors
... Similarly, when power factor correction capacitors are used, voltage sensing phase failure relay does not offer adequate protection. These capacitors are connected across the motor windings and are fully charged to the supply voltage. In case of phase failure the capacitor has to discharge sufficien ...
... Similarly, when power factor correction capacitors are used, voltage sensing phase failure relay does not offer adequate protection. These capacitors are connected across the motor windings and are fully charged to the supply voltage. In case of phase failure the capacitor has to discharge sufficien ...
protective device for pumps / motors
... Low Voltage compels electric motor to draw more current in order to deliver required power. This creates overloading condition. Moreover, power output, RPM and torque of the motor also drop considerable at low voltage (T V2; a change of 5% in supply voltage will cause about 10% change in rotor torq ...
... Low Voltage compels electric motor to draw more current in order to deliver required power. This creates overloading condition. Moreover, power output, RPM and torque of the motor also drop considerable at low voltage (T V2; a change of 5% in supply voltage will cause about 10% change in rotor torq ...
fault zone analysis
... indications of a stator fault. Therefore, it is recommended to perform the tests when the motor is loaded to 70% or more. Tests performed at less than 70% load should be compared with other tests performed at the same load ...
... indications of a stator fault. Therefore, it is recommended to perform the tests when the motor is loaded to 70% or more. Tests performed at less than 70% load should be compared with other tests performed at the same load ...
8245 - SK Engineering Academy
... In D.C. series generator, with increase in load, it’ terminal voltage is also increased. So it is called as rising characteristic machine. 22. What do you mean by saturation of field pole? If we are going on increasing the field current, after certain limit, any more rise in current will not have a ...
... In D.C. series generator, with increase in load, it’ terminal voltage is also increased. So it is called as rising characteristic machine. 22. What do you mean by saturation of field pole? If we are going on increasing the field current, after certain limit, any more rise in current will not have a ...
E013418426
... interconnected motors. They are suitable for applications where load independent speeds or synchronous operation are required under strict observance of defined speed relations within a large frequency range. Most of the industrial motor applications use AC induction motors. The reasons for this inc ...
... interconnected motors. They are suitable for applications where load independent speeds or synchronous operation are required under strict observance of defined speed relations within a large frequency range. Most of the industrial motor applications use AC induction motors. The reasons for this inc ...
DC Generators and Motors
... cuts DOWN through the field. At the same time the white conductor cuts UP through the field. The induced emfs in the conductors are series-adding. This means the resultant voltage across the brushes (the terminal voltage) is the sum of the two induced voltages. The meter at position B reads maximum ...
... cuts DOWN through the field. At the same time the white conductor cuts UP through the field. The induced emfs in the conductors are series-adding. This means the resultant voltage across the brushes (the terminal voltage) is the sum of the two induced voltages. The meter at position B reads maximum ...
Optimal design of switched reluctance motors
... is independent of the direction of the current, the drive could be arranged to use only one transistor per phase instead of the two used in ac drives. However, the necessary reversal of the phase voltage (for commutation and in some cases for current regulation) is much easier to achieve with two tr ...
... is independent of the direction of the current, the drive could be arranged to use only one transistor per phase instead of the two used in ac drives. However, the necessary reversal of the phase voltage (for commutation and in some cases for current regulation) is much easier to achieve with two tr ...
ASSP Technology for Industrial Motion Control - All
... A major concern of every system designer using a stepper-motor is how to drive this actuator without losing steps. Many parameters are influencing the correct motion and it is not always easy to find the right combination. [Ref 1]. Varying all kinds of settings to find the optimum can lead to a long ...
... A major concern of every system designer using a stepper-motor is how to drive this actuator without losing steps. Many parameters are influencing the correct motion and it is not always easy to find the right combination. [Ref 1]. Varying all kinds of settings to find the optimum can lead to a long ...
Wind Turbine, 2009 - WPI - Worcester Polytechnic Institute
... at low or no wind speeds. As the current from the grid passes through the coils stator, a current is induced in the cage rotor itself; causing opposing magnetic fields in the cage, and as a result turning the rotor. Power generation occurs when the wind causes the rotational speed of the rotor to in ...
... at low or no wind speeds. As the current from the grid passes through the coils stator, a current is induced in the cage rotor itself; causing opposing magnetic fields in the cage, and as a result turning the rotor. Power generation occurs when the wind causes the rotational speed of the rotor to in ...
NO OUTPUT (ALL GENERATORS)
... Check for Residual output at receptacles WITH THE ENGINE RUNNING. Expect Minimum of 3 - 5 VAC at the 120V receptacles, double at the 240V recept. Always start on the HIGHEST ACV Scale. Don’t blow the ohms scale on the first test! With the engine running, flash the field with 9 VDC dry battery if out ...
... Check for Residual output at receptacles WITH THE ENGINE RUNNING. Expect Minimum of 3 - 5 VAC at the 120V receptacles, double at the 240V recept. Always start on the HIGHEST ACV Scale. Don’t blow the ohms scale on the first test! With the engine running, flash the field with 9 VDC dry battery if out ...
Novel Permanent Magnet Motor Drives for Electric Vehicles
... low gear and high cruising speed at high gear, it suffers Since the coil span of stator windings is designed to be from heavy weight, large size, high cost and additional equal to the slot pitch, the overhanging part of the coil complexity. With the introduction of advanced EV motor can be significa ...
... low gear and high cruising speed at high gear, it suffers Since the coil span of stator windings is designed to be from heavy weight, large size, high cost and additional equal to the slot pitch, the overhanging part of the coil complexity. With the introduction of advanced EV motor can be significa ...
File - ganesh subramanian
... Conductor: The active length of copper or aluminium wire in the slot is called conductor. Turn: Two conductors connected for additive emf is called a turn. The two conductors of a turn are placed approximately a pole pitch apart. Coil: A coil consists of a number of turns and it is the princip ...
... Conductor: The active length of copper or aluminium wire in the slot is called conductor. Turn: Two conductors connected for additive emf is called a turn. The two conductors of a turn are placed approximately a pole pitch apart. Coil: A coil consists of a number of turns and it is the princip ...
Lecuture-44
... Lecuture-44 Design of stator winding Stator winding is made up of former wound coils of high conductivity copper of diamond shape. These windings must be properly arranged such that the induced emf in all the phases of the coils must have the same magnitude and frequency. These emfs must have same w ...
... Lecuture-44 Design of stator winding Stator winding is made up of former wound coils of high conductivity copper of diamond shape. These windings must be properly arranged such that the induced emf in all the phases of the coils must have the same magnitude and frequency. These emfs must have same w ...
I2C Communications with Honeywell Digital Output Force Sensors
... BLDC motors are essentially brush-type motors turned inside out. Power is fed directly to the armature windings, while a permanent magnet rotor is the rotating member. Depending on the design, the motor can be either inner or outer rotating. Also, the brushes and commutator of a classic DC motor are ...
... BLDC motors are essentially brush-type motors turned inside out. Power is fed directly to the armature windings, while a permanent magnet rotor is the rotating member. Depending on the design, the motor can be either inner or outer rotating. Also, the brushes and commutator of a classic DC motor are ...
Magnetic Position Sensing in Brushless DC Electric Motors
... BLDC motors are essentially brush-type motors turned inside out. Power is fed directly to the armature windings, while a permanent magnet rotor is the rotating member. Depending on the design, the motor can be either inner or outer rotating. Also, the brushes and commutator of a classic DC motor are ...
... BLDC motors are essentially brush-type motors turned inside out. Power is fed directly to the armature windings, while a permanent magnet rotor is the rotating member. Depending on the design, the motor can be either inner or outer rotating. Also, the brushes and commutator of a classic DC motor are ...
Brushless Motors
... to the motor power leads. With the DC wall voltage at 40 VDC as measured by VM1, apply power to the circuit. Adjust R1 to obtain a steady speed of 3000 rpm. Obtain printouts of the voltages between points A, B, C, and chassis ground; also obtain printouts of the A-to-B and A-to-C line-to-line voltag ...
... to the motor power leads. With the DC wall voltage at 40 VDC as measured by VM1, apply power to the circuit. Adjust R1 to obtain a steady speed of 3000 rpm. Obtain printouts of the voltages between points A, B, C, and chassis ground; also obtain printouts of the A-to-B and A-to-C line-to-line voltag ...
SNC1D0 How Nikola Tesla Changed the Way we Use Energy
... heard about Tesla's 1888 lecture and immediately was intrigued. When Peck and Brown approached Westinghouse about commercializing Tesla's inventions, the entrepreneur responsible for the railroad air brake made a generous offer. He agreed to pay $25,000 in cash, as well as $50,000 in notes and a sma ...
... heard about Tesla's 1888 lecture and immediately was intrigued. When Peck and Brown approached Westinghouse about commercializing Tesla's inventions, the entrepreneur responsible for the railroad air brake made a generous offer. He agreed to pay $25,000 in cash, as well as $50,000 in notes and a sma ...
Commutator (electric)
![](https://commons.wikimedia.org/wiki/Special:FilePath/Universal_motor_commutator.jpg?width=300)
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.