Document
... At fixed load, speed of rotation is proportional to applied voltage. Changing polarity reverses rotation. ...
... At fixed load, speed of rotation is proportional to applied voltage. Changing polarity reverses rotation. ...
Causes of Motor Failures
... Any voltage drop below 10% will reduce starting torque which can be serious because starting times may increase beyond allowable limits. Winding failure from extreme voltage variations are identical to those of overloads because the input current is uniformily excessive. ...
... Any voltage drop below 10% will reduce starting torque which can be serious because starting times may increase beyond allowable limits. Winding failure from extreme voltage variations are identical to those of overloads because the input current is uniformily excessive. ...
Chapter 7: DC Machine Fundamentals
... placed in slots 7 and 12. The other end of coil is connected to commutator bar 13. The second coil starts at this commutator bar and is placed in slots 18 and 2 and ends on commutator bar 3. This winding is called a wave winding because the coils are laid down a wave pattern. ...
... placed in slots 7 and 12. The other end of coil is connected to commutator bar 13. The second coil starts at this commutator bar and is placed in slots 18 and 2 and ends on commutator bar 3. This winding is called a wave winding because the coils are laid down a wave pattern. ...
Chapter 7: DC Machine Fundamentals
... placed in slots 7 and 12. The other end of coil is connected to commutator bar 13. The second coil starts at this commutator bar and is placed in slots 18 and 2 and ends on commutator bar 3. This winding is called a wave winding because the coils are laid down a wave pattern. ...
... placed in slots 7 and 12. The other end of coil is connected to commutator bar 13. The second coil starts at this commutator bar and is placed in slots 18 and 2 and ends on commutator bar 3. This winding is called a wave winding because the coils are laid down a wave pattern. ...
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 ...
12.6 The Direct Current Motor
... magnetic field. But the motion will only occur once. What if you want the motion to be continuous? Looking back at the galvanometer design, it is possible to get part of a complete turn, but the spring prevents further motion. Furthermore, the loop and the needle are forced back in the opposite dire ...
... magnetic field. But the motion will only occur once. What if you want the motion to be continuous? Looking back at the galvanometer design, it is possible to get part of a complete turn, but the spring prevents further motion. Furthermore, the loop and the needle are forced back in the opposite dire ...
Three-Phase Induction Motor
... Three-Phase Induction Motor stator resistance was measured by an ohmmeter and is 6.6/phase. This is the R1 value to be used for the equivalent circuit. Note that R1 cannot be neglected for the no-load tests. ...
... Three-Phase Induction Motor stator resistance was measured by an ohmmeter and is 6.6/phase. This is the R1 value to be used for the equivalent circuit. Note that R1 cannot be neglected for the no-load tests. ...
Inverter Error Messages
... Magnetek, Yaskawa and Baldor all utilize error codes to identify inverter problems. A full description of the codes can be found in the “Technical Manuals” provided with the respective drives. When troubleshooting these errors lease consult the manuals. For Magnetek or Yaskawa you can find the manua ...
... Magnetek, Yaskawa and Baldor all utilize error codes to identify inverter problems. A full description of the codes can be found in the “Technical Manuals” provided with the respective drives. When troubleshooting these errors lease consult the manuals. For Magnetek or Yaskawa you can find the manua ...
Chapter-8 - Universities Press
... It is also known as short circuit test or locked rotor test or stalled torque test. From this test short-circuit current at normal voltage, power factor on short-circuit, total leakage reactance, starting torque of the motor can be found. The test is conducted at low voltage because if the appli ...
... It is also known as short circuit test or locked rotor test or stalled torque test. From this test short-circuit current at normal voltage, power factor on short-circuit, total leakage reactance, starting torque of the motor can be found. The test is conducted at low voltage because if the appli ...
stepper motors and drive methods
... present and therefore a braking effect still exists with no current flow in the stator windings. Stepper motor speeds are typically from zero to a few hundred RPM, and they are best suited to low speed applications Naturally, a stepper motor physically like the one shown would not be very useful as ...
... present and therefore a braking effect still exists with no current flow in the stator windings. Stepper motor speeds are typically from zero to a few hundred RPM, and they are best suited to low speed applications Naturally, a stepper motor physically like the one shown would not be very useful as ...
File
... current is drawn by the stator, on the order of 5 to 9 times the full load current. This high current can damage the motor windings and because it causes heavy line voltage drop, other appliances connected to the same line may be affected by the voltage fluctuation. To avoid such effects, the starti ...
... current is drawn by the stator, on the order of 5 to 9 times the full load current. This high current can damage the motor windings and because it causes heavy line voltage drop, other appliances connected to the same line may be affected by the voltage fluctuation. To avoid such effects, the starti ...
DC motor-1st Order
... transducer such that it blocks the armature from rotation. The PCB power supply for the force transducer should be adjusted to have a gain of 1 (see back of the power supply). Rotate the armature away from the force transducer and adjust the dial indicator on the front of the PCB power supply, until ...
... transducer such that it blocks the armature from rotation. The PCB power supply for the force transducer should be adjusted to have a gain of 1 (see back of the power supply). Rotate the armature away from the force transducer and adjust the dial indicator on the front of the PCB power supply, until ...
Chapter 4: Direct-Current Generators ()
... Form the Maxwell stress concept it follows that there will be a torque on the armature tending to rotate its poles into alignment with the field poles. The armature winding and commutator, ensure that the magnetic axis of the armature remains fixed in space while the armature material revolves. Ther ...
... Form the Maxwell stress concept it follows that there will be a torque on the armature tending to rotate its poles into alignment with the field poles. The armature winding and commutator, ensure that the magnetic axis of the armature remains fixed in space while the armature material revolves. Ther ...
INDUSTRIAL ELECTRICITY NCCER based training Module 1
... Module 2: Motor Controls Certification – 40 hours DC Circuits (Module 33201-10) – Electrical Systems Tech Level 2 This module introduces the trainee to DC electrical circuits. It offers a general introduction to electrical concepts used in Ohm’s law. It includes atomic theory, electromagnetic force, ...
... Module 2: Motor Controls Certification – 40 hours DC Circuits (Module 33201-10) – Electrical Systems Tech Level 2 This module introduces the trainee to DC electrical circuits. It offers a general introduction to electrical concepts used in Ohm’s law. It includes atomic theory, electromagnetic force, ...
File - Des Moines Modelaires
... ESCs can also be programmed with failsafe setting such as what to do if the receiver input is lost, or adjust the motor timing. Some ESCs can provide power (usually 5 volts) for the servos in the aircraft, while some ESCs do not have that capability. If the ESC does not provide power for the servos ...
... ESCs can also be programmed with failsafe setting such as what to do if the receiver input is lost, or adjust the motor timing. Some ESCs can provide power (usually 5 volts) for the servos in the aircraft, while some ESCs do not have that capability. If the ESC does not provide power for the servos ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
... between precise control and the number of power electronic devices required to control the stator currents. For the rotor, a greater number of poles usually create a greater torque for the same level of current. On the other hand, by adding more magnets, a point is reached where, because of the spac ...
... between precise control and the number of power electronic devices required to control the stator currents. For the rotor, a greater number of poles usually create a greater torque for the same level of current. On the other hand, by adding more magnets, a point is reached where, because of the spac ...
Brushed DC electric motor
A brushed DC motor is an internally commutated electric motor designed to be run from a direct current power source. Brushed motors were the first commercially important application of electric power to driving mechanical energy,and DC distribution systems were used for more than 100 years to operate motors in commercial and industrial buildings. Brushed DC motors can be varied in speed by changing the operating voltage or the strength of the magnetic field. Depending on the connections of the field to the power supply, the speed and torque characteristics of a brushed motor can be altered to provide steady speed or speed inversely proportional to the mechanical load. Brushed motors continue to be used for electrical propulsion, cranes, paper machines and steel rolling mills. Since the brushes wear down and require replacement, brushless DC motors using power electronic devices have displaced brushed motors from many applications