Electrical Motor Starters
... operator may now release the start button since supply to L is maintained through L1. After a time interval which allows the motor to run up to speed, auxiliary contacts L2 and L3 close. Contactor coil S is de-energised and its contacts S open; so do the auxiliary contact S1. Contactor coil D is ene ...
... operator may now release the start button since supply to L is maintained through L1. After a time interval which allows the motor to run up to speed, auxiliary contacts L2 and L3 close. Contactor coil S is de-energised and its contacts S open; so do the auxiliary contact S1. Contactor coil D is ene ...
Switched Reluctance Motor - University of Technology Sydney
... The rotor is aligned whenever the diametrically opposite stator poles are excited. In a magnetic circuit, the rotating part prefers to come to the minimum reluctance position at the instance of excitation. While two rotor poles are aligned to the two stator poles, another set of rotor poles is out o ...
... The rotor is aligned whenever the diametrically opposite stator poles are excited. In a magnetic circuit, the rotating part prefers to come to the minimum reluctance position at the instance of excitation. While two rotor poles are aligned to the two stator poles, another set of rotor poles is out o ...
Motor control
... Average voltage is controlled by on vs. off time Noise reduced through filtering or higher frequency pulses Need diode protection from winding discharge Chopping gives highest current (torque) Higher voltage used to charge windings more quickly Can determine position and vary voltage/cur ...
... Average voltage is controlled by on vs. off time Noise reduced through filtering or higher frequency pulses Need diode protection from winding discharge Chopping gives highest current (torque) Higher voltage used to charge windings more quickly Can determine position and vary voltage/cur ...
Analysis and Simulation of Switching Angle Effects on Dynamic
... magnets and electronic devices. The brushless permanent magnet motors perform better and have higher efficiency than the machines with electromagnetic excitation [9]. The research carried out for several decades to increase the torque density and motor efficiency has led to invention of several newe ...
... magnets and electronic devices. The brushless permanent magnet motors perform better and have higher efficiency than the machines with electromagnetic excitation [9]. The research carried out for several decades to increase the torque density and motor efficiency has led to invention of several newe ...
Auto-Electric Basic Technology - Part 2
... Why there is a need to use relays? The reason to use in several cases a relay is given by a higher current flow in some circuits like for double horn, spotlight, fog light or for the headlight. But practically you will find always again i. e. headlight circuits in motor vehicles without using a rela ...
... Why there is a need to use relays? The reason to use in several cases a relay is given by a higher current flow in some circuits like for double horn, spotlight, fog light or for the headlight. But practically you will find always again i. e. headlight circuits in motor vehicles without using a rela ...
No Slide Title - Electrical & Computer Engineering
... Remember that these may be done either individually or in your lab groups. ...
... Remember that these may be done either individually or in your lab groups. ...
Hola Agustin - Portal UniMAP
... Generator design varies depending on the sizes, type and manufacture but the general arrangement of parts is as shown in Fig 3-12 Main Frame: The main frame is sometimes called the yoke. It is the foundation of the machine and supports the other components. It is also serves to complete the magnetic ...
... Generator design varies depending on the sizes, type and manufacture but the general arrangement of parts is as shown in Fig 3-12 Main Frame: The main frame is sometimes called the yoke. It is the foundation of the machine and supports the other components. It is also serves to complete the magnetic ...
Engineering Letters
... the stator is made up of several hundred thin laminations. Stator laminations are stacked together forming a hollow cylinder and coils of insulated wire are inserted into slot of the stator core. The basic concept of the motor operation is electromagnetism which is, each group of coils together with ...
... the stator is made up of several hundred thin laminations. Stator laminations are stacked together forming a hollow cylinder and coils of insulated wire are inserted into slot of the stator core. The basic concept of the motor operation is electromagnetism which is, each group of coils together with ...
P3 Ass 2 Higher Ms - Durrington High School
... plant oil will add less carbon dioxide to the atmosphere (when it is being produced / processed, than the usual oil) plant oil removes carbon dioxide from or adds oxygen to the air when it is growing stating that plant oil is carbon neutral is insufficient ...
... plant oil will add less carbon dioxide to the atmosphere (when it is being produced / processed, than the usual oil) plant oil removes carbon dioxide from or adds oxygen to the air when it is growing stating that plant oil is carbon neutral is insufficient ...
Background Lecture - IEEE Real World Engineering Projects
... • Shorter trip times in high density urban areas • Quieter ...
... • Shorter trip times in high density urban areas • Quieter ...
Methodology to Estimate The DQ Axis Model Parameter
... space-vector theory. Such a model is valid for any instantaneous variation of voltage and current, and adequately describes the performance of the machine under both steady-state and transient operations. Complex space vectors can be described using only two orthogonal axes. For the demonstration of ...
... space-vector theory. Such a model is valid for any instantaneous variation of voltage and current, and adequately describes the performance of the machine under both steady-state and transient operations. Complex space vectors can be described using only two orthogonal axes. For the demonstration of ...
Alternating Current - Goodheart
... A more meaningful value of an alternating current is its effective value. To determine the effective value, the alternating current is compared to a direct current. In other words, if a direct current will produce a certain power, what equivalent alternating current will produce the same power or wo ...
... A more meaningful value of an alternating current is its effective value. To determine the effective value, the alternating current is compared to a direct current. In other words, if a direct current will produce a certain power, what equivalent alternating current will produce the same power or wo ...
A Design Study of Dual-Stator Permanent Magnet Brushless DC Motor
... stator and the inside magnets compose an outer-rotor BLDC; the outer stator and the outside magnets compose an inner-rotor BLDC; both of the motors share the same rotor core. Due to the series magnetic circuit structure of the DSBLDC, the inside and outside magnets are oriented in the same magnetiza ...
... stator and the inside magnets compose an outer-rotor BLDC; the outer stator and the outside magnets compose an inner-rotor BLDC; both of the motors share the same rotor core. Due to the series magnetic circuit structure of the DSBLDC, the inside and outside magnets are oriented in the same magnetiza ...
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.