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PNIMNiPE_nr56 - Instytut Maszyn, Napędów i Pomiarów
... It can be noticed, that when the motor is supplied with voltage of frequency 60 Hz, the rotor rotates with higher no-load and rated speed. The motor’s magnetic field rotates with synchronous speed about 377 rad/s, compared to about 314 rad/s for the line frequency 50 Hz. In addition to the average a ...
... It can be noticed, that when the motor is supplied with voltage of frequency 60 Hz, the rotor rotates with higher no-load and rated speed. The motor’s magnetic field rotates with synchronous speed about 377 rad/s, compared to about 314 rad/s for the line frequency 50 Hz. In addition to the average a ...
原文 DC GENENRATORS 1. INTRODUCTION For all practical
... short-circuit current, however, is then limited to a “safe” value. The terminal characteristic for this type of generator is also shown in Fig.9. Compound generators are used more extensively than the other types because they may be designed to have a wide varity of terminal characteristics. As illu ...
... short-circuit current, however, is then limited to a “safe” value. The terminal characteristic for this type of generator is also shown in Fig.9. Compound generators are used more extensively than the other types because they may be designed to have a wide varity of terminal characteristics. As illu ...
Field Oriented Control of Permanent Magnet Synchronous Motor
... the control of the PMSM in the same way as a separately excited DC motor operated with a current regulated armature supply where then the torque is proportional to the product of armature current and the excitation flux. Similarly, torque control of the PMSM is achieved by controlling the torque cur ...
... the control of the PMSM in the same way as a separately excited DC motor operated with a current regulated armature supply where then the torque is proportional to the product of armature current and the excitation flux. Similarly, torque control of the PMSM is achieved by controlling the torque cur ...
17511 Sample Question Paper
... c) A 3300 V, 50 Hz star connected alternator has a full load current of 90 A. When the output terminals of alternator are shorted a field current of 6 A produces a full load current. The open circuit emf for the same field current was 1000 V. If the armature resistance per phase is 0.5 Ω, find volta ...
... c) A 3300 V, 50 Hz star connected alternator has a full load current of 90 A. When the output terminals of alternator are shorted a field current of 6 A produces a full load current. The open circuit emf for the same field current was 1000 V. If the armature resistance per phase is 0.5 Ω, find volta ...
DC Machine lab
... and the armature. If the process is partially reversed by electrically exciting the stator mounted field and providing torque from an external prime-mover, the machine becomes a generator. As the prime-mover spins the armature circuit through the magnetic field, a voltage is created in the armature ...
... and the armature. If the process is partially reversed by electrically exciting the stator mounted field and providing torque from an external prime-mover, the machine becomes a generator. As the prime-mover spins the armature circuit through the magnetic field, a voltage is created in the armature ...
Everything you wanted to know about stepper motors
... how do we do that!” Easy, we do it two ways, we use much higher voltages, often ten to twenty times the nameplate voltage to switch the current on, i.e. we try to turn the flywheel harder. This sounds simple enough but in so doing we open another can of worms, the current through the coils will also ...
... how do we do that!” Easy, we do it two ways, we use much higher voltages, often ten to twenty times the nameplate voltage to switch the current on, i.e. we try to turn the flywheel harder. This sounds simple enough but in so doing we open another can of worms, the current through the coils will also ...
Efficient Motor Control for in SmartFusion
... Figure 2 shows the block diagram of field-oriented control for a PMSM. Three measurements are taken as feedback from the motor: phase currents and position of the rotor. There are many ways of obtaining feedback to calculate position, such as a Hall effect sensor, encoder or sensorless using back em ...
... Figure 2 shows the block diagram of field-oriented control for a PMSM. Three measurements are taken as feedback from the motor: phase currents and position of the rotor. There are many ways of obtaining feedback to calculate position, such as a Hall effect sensor, encoder or sensorless using back em ...
article: linear induction motor
... A single-phase induction motor requires separate starting circuitry to provide a rotating field to the motor. The normal running windings within such a single-phase motor can cause the rotor to turn in either direction, so the starting circuit determines the operating direction. In certain smaller s ...
... A single-phase induction motor requires separate starting circuitry to provide a rotating field to the motor. The normal running windings within such a single-phase motor can cause the rotor to turn in either direction, so the starting circuit determines the operating direction. In certain smaller s ...
Hola Agustin - Portal UniMAP
... unlike poles are aligned. This reversal of current is accomplished through the action of the commutator. When the current flow is reversed, the magnetic polarity of the armature reverses. The south pole of the armature is near the south pole of the main field; the north pole of the armature is near ...
... unlike poles are aligned. This reversal of current is accomplished through the action of the commutator. When the current flow is reversed, the magnetic polarity of the armature reverses. The south pole of the armature is near the south pole of the main field; the north pole of the armature is near ...
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.