Some Examples that Use the FEM in PM Generators Analysis
... models were made. Optimizations of realistic machine models where first performed in the late 80s and early 90s. However, research directed to accelerate the numerical solver is going on as well. Extension of the overall machine models can be made by applying more realistic material models. Hysteres ...
... models were made. Optimizations of realistic machine models where first performed in the late 80s and early 90s. However, research directed to accelerate the numerical solver is going on as well. Extension of the overall machine models can be made by applying more realistic material models. Hysteres ...
drive_systems
... - Curtis 1244 Sep-Ex shunt DC regen controller: complex with marginal performance. - Zapi Sep-Ex shunt DC regen controller: same as above. - Customized series wound DC motor with variable mechanical brush timing to improve forward and regen efficiency: too many parts - Dual DC with no transmission: ...
... - Curtis 1244 Sep-Ex shunt DC regen controller: complex with marginal performance. - Zapi Sep-Ex shunt DC regen controller: same as above. - Customized series wound DC motor with variable mechanical brush timing to improve forward and regen efficiency: too many parts - Dual DC with no transmission: ...
Exclusive Technology Feature Current Flow Analysis in Permanent
... than the ferrite magnets. However, there have been more recent introductions of other PMs with even better performance. In the 1980s, neodymium-iron-boron (NdFeB) was invented, offering higher performance and lower cost than SmCo. However, NdFeB is not always superior due to its lower thermal stabil ...
... than the ferrite magnets. However, there have been more recent introductions of other PMs with even better performance. In the 1980s, neodymium-iron-boron (NdFeB) was invented, offering higher performance and lower cost than SmCo. However, NdFeB is not always superior due to its lower thermal stabil ...
Simulation of an Electrical Machine
... Electrical machines are widely used for a range of different applications. They can be found in everything from household appliances to industrial machines. The type of bearings used in the machine varies depending on the application. This thesis will cover the study of asynchronous electrical machi ...
... Electrical machines are widely used for a range of different applications. They can be found in everything from household appliances to industrial machines. The type of bearings used in the machine varies depending on the application. This thesis will cover the study of asynchronous electrical machi ...
AVR496: Brushless DC Motor Control using
... Brushless DC motors are used in a growing number of motor applications as they have many advantages: They have no brushes so they require little or no maintenance. They generate less acoustic and electrical noise than universal brushed DC motors. They can be used in hazardous operation environments ...
... Brushless DC motors are used in a growing number of motor applications as they have many advantages: They have no brushes so they require little or no maintenance. They generate less acoustic and electrical noise than universal brushed DC motors. They can be used in hazardous operation environments ...
Formating rules
... [email protected] , [email protected], [email protected] , [email protected] Abstract- The results of effect of induction motor undamped field on transient electromagnetic torques in motor switching regime research are presented in these investigations. ...
... [email protected] , [email protected], [email protected] , [email protected] Abstract- The results of effect of induction motor undamped field on transient electromagnetic torques in motor switching regime research are presented in these investigations. ...
experiment - Portal UniMAP
... The operating principle of this type of motor is more complex than that of the three-phase squirrel-cage induction motor. The simple induction motor of Figure 5.1 can even be considered as an eddy-current brake that brakes in an intermittent manner since the sinusoidal current in the stator electrom ...
... The operating principle of this type of motor is more complex than that of the three-phase squirrel-cage induction motor. The simple induction motor of Figure 5.1 can even be considered as an eddy-current brake that brakes in an intermittent manner since the sinusoidal current in the stator electrom ...
DA33612620
... load and high efficiency at low load. Such hybrid design also allows the control of harmonic current [6]. In case of common DC motors, the brushes automatically come into contact with the commutatorof a different coil causing the motor to continue its rotation. But in case of BLDC motors the commuta ...
... load and high efficiency at low load. Such hybrid design also allows the control of harmonic current [6]. In case of common DC motors, the brushes automatically come into contact with the commutatorof a different coil causing the motor to continue its rotation. But in case of BLDC motors the commuta ...
2008 KCSE ELECTRICITY PAPER 1 MS
... (5 marks) (a) Assuming the motor has been operating at moderate speed, when it is suddently subjected to a heavier load, the first effect is to slow down the motor. Slowing the motor reduces back emf generated because back emf is directly proportional to speed. Reduced back emf makes the line ...
... (5 marks) (a) Assuming the motor has been operating at moderate speed, when it is suddently subjected to a heavier load, the first effect is to slow down the motor. Slowing the motor reduces back emf generated because back emf is directly proportional to speed. Reduced back emf makes the line ...
AC Induction Motor Control
... control of motor torque and magnetic flux. The control is based on the transformation of current/ voltage coordinates from stationary to rotation that makes the control similar to DC machine control. The control incorporates fast torque/ flux current control loops and slower speed/position control l ...
... control of motor torque and magnetic flux. The control is based on the transformation of current/ voltage coordinates from stationary to rotation that makes the control similar to DC machine control. The control incorporates fast torque/ flux current control loops and slower speed/position control l ...
RECENT PROBLEMS EXPERIENCED WITH MOTOR AND GENERATOR WINDINGS
... conducted during regular maintenance. ...
... conducted during regular maintenance. ...
Key Words:
... The range in Qm from all of the tests for the particular operating voltage, size, sensor type, etc. was established for each set of these factors. A cumulative version of the statistical distribution is shown in Table 1, which also shows the maximum Qm measured as well as the average Qm. For example ...
... The range in Qm from all of the tests for the particular operating voltage, size, sensor type, etc. was established for each set of these factors. A cumulative version of the statistical distribution is shown in Table 1, which also shows the maximum Qm measured as well as the average Qm. For example ...
Design procedures for small synchronous generators with interior
... cost design of the rotor. This means an optimum between the magnetic material volume and the costs of mounting. Moreover, several secondary effect, such as cogging torque, torque ripple, non-sinusoidal shape of no-load voltage and losses, which are worsening the operation behaviour of such permanent ...
... cost design of the rotor. This means an optimum between the magnetic material volume and the costs of mounting. Moreover, several secondary effect, such as cogging torque, torque ripple, non-sinusoidal shape of no-load voltage and losses, which are worsening the operation behaviour of such permanent ...
Winding Failures of Electrical Motors
... Pictures number 10 and 11: The winding single-phase defect is aconsequence of an interruption in one power supply phase. This defect is normally caused by a burnt fuse, open contactor, one power supply interrupted or poor connection. ...
... Pictures number 10 and 11: The winding single-phase defect is aconsequence of an interruption in one power supply phase. This defect is normally caused by a burnt fuse, open contactor, one power supply interrupted or poor connection. ...
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.