UNIT – 1 Explain the principle of operation of a DC Motor. ANS
... (NVC) which is further connected to terminal 'F'. The starting resistance at starting is entirely in series with the armature. The OLR and NVC acts as the two protecting devices of the starter. Working of Three Point Starter Having studied its construction, let us now go into the working of the 3 po ...
... (NVC) which is further connected to terminal 'F'. The starting resistance at starting is entirely in series with the armature. The OLR and NVC acts as the two protecting devices of the starter. Working of Three Point Starter Having studied its construction, let us now go into the working of the 3 po ...
A Slot Harmonic Detection with an Empirical Formula to Extend the
... Also, because of advances in solid state power devices and digital signal processors, variable speed drives using switching power converters are becoming increasingly popular. Switching power converters offer an easy way to regulate both the frequency and magnitude of the voltage and current applied ...
... Also, because of advances in solid state power devices and digital signal processors, variable speed drives using switching power converters are becoming increasingly popular. Switching power converters offer an easy way to regulate both the frequency and magnitude of the voltage and current applied ...
Chapter 20
... Converts mechanical energy to electrical energy Consists of a wire loop rotated by some external means There are a variety of sources that can supply the energy to rotate the loop ...
... Converts mechanical energy to electrical energy Consists of a wire loop rotated by some external means There are a variety of sources that can supply the energy to rotate the loop ...
RTU Zinatniskais raksts
... regimes as self start, reverse, repeated closing. Thus, there is an opportunity to get rotation frequency curves for any IM with different load factors and load torques without application of graphic and analytic methods. For mechanism exact stoppage it is important to know not only rotation frequen ...
... regimes as self start, reverse, repeated closing. Thus, there is an opportunity to get rotation frequency curves for any IM with different load factors and load torques without application of graphic and analytic methods. For mechanism exact stoppage it is important to know not only rotation frequen ...
Modeling, simulation and experimental analysis of permanent
... These models employ state-space equations, Fourier series or d-q axis model. Even though these models have made a great contribution in the BLDC motor drives, there is no comprehensive model for the analysis of motor used in sensorless operation [1]. The machine models are often transformed to a rot ...
... These models employ state-space equations, Fourier series or d-q axis model. Even though these models have made a great contribution in the BLDC motor drives, there is no comprehensive model for the analysis of motor used in sensorless operation [1]. The machine models are often transformed to a rot ...
H02P - Cooperative Patent Classification
... for starting an individual single-phase induction motor {(H02P 27/04 takes precedence)} . {by using means to limit the current in the main winding} . {by using a specially adapted frequency converter} . by phase-splitting with a capacitor . . {by using additional capacitors switched at start up} for ...
... for starting an individual single-phase induction motor {(H02P 27/04 takes precedence)} . {by using means to limit the current in the main winding} . {by using a specially adapted frequency converter} . by phase-splitting with a capacitor . . {by using additional capacitors switched at start up} for ...
Wide-Speed Operation of Direct Torque
... OPERATION The stator of the considered VSI-fed IPMSM is a typical AC design accommodating a three-phase distributed winding in slots to produce the synchronously-rotating, quasi-sinusoidal armature-mmf wave. Conversely, the IPMSM rotor can be designed in different configurations. However, only two o ...
... OPERATION The stator of the considered VSI-fed IPMSM is a typical AC design accommodating a three-phase distributed winding in slots to produce the synchronously-rotating, quasi-sinusoidal armature-mmf wave. Conversely, the IPMSM rotor can be designed in different configurations. However, only two o ...
Development of the Descent Brake Mechanism for the Mars Science
... Descent Brake is seven seconds, which does not generate enough heat to cause the interference. This issue did not show up until the run-in was performed for 1 hour in each direction at 6 rad/s. ...
... Descent Brake is seven seconds, which does not generate enough heat to cause the interference. This issue did not show up until the run-in was performed for 1 hour in each direction at 6 rad/s. ...
25471_energy_conversion_15
... The No-Load Test The DC Test The Locked-Rotor Test 10. Determining Circuit model parameters No-load test/ DC test for stator resistance Locked-Rotor test 11. Induction Generator induction generator operating alone/ induction Generator application Induction motor ratings ...
... The No-Load Test The DC Test The Locked-Rotor Test 10. Determining Circuit model parameters No-load test/ DC test for stator resistance Locked-Rotor test 11. Induction Generator induction generator operating alone/ induction Generator application Induction motor ratings ...
Guidelines for Paper Preparation
... new legislations demand higher efficiency motors. The use of LSPMM can help to achieve the new requirements. It became competitor to cage induction motor in the general purpose industrial applications due to its high efficiency, high power factor and its ability to self start from the regular fixed ...
... new legislations demand higher efficiency motors. The use of LSPMM can help to achieve the new requirements. It became competitor to cage induction motor in the general purpose industrial applications due to its high efficiency, high power factor and its ability to self start from the regular fixed ...
Charging System Fundamentals
... Direct Current (DC) Generators • Older cars used DC generators – Produces AC • Output is DC because its commutator has brushes on north and south poles ...
... Direct Current (DC) Generators • Older cars used DC generators – Produces AC • Output is DC because its commutator has brushes on north and south poles ...
DESIGN OF DC MACHINE
... i) Cost : the manufacturing cost of a machine with large core length, is less. This is because the proportion of inactive copper to active copper is smaller for grater the length of core. Therefore it is desirable to have large core length for less cost. ii) Ventilation: the ventilation of large cor ...
... i) Cost : the manufacturing cost of a machine with large core length, is less. This is because the proportion of inactive copper to active copper is smaller for grater the length of core. Therefore it is desirable to have large core length for less cost. ii) Ventilation: the ventilation of large cor ...
here - Stepper Motor Controllers
... preferable variable output from 10 to 40VDC,maximum output current 1Ampere or more. A bipolar stepper motor with rated current less than 1Ampere and rated voltage less than 20V. The nominal drive current is 415mA, with a simple modification on the value of the current sensing resistors you can adapt ...
... preferable variable output from 10 to 40VDC,maximum output current 1Ampere or more. A bipolar stepper motor with rated current less than 1Ampere and rated voltage less than 20V. The nominal drive current is 415mA, with a simple modification on the value of the current sensing resistors you can adapt ...
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.