Induction - Palang Thai
... DC Alternator (automotive) • May be rewound for lower rpm at low head. • The field may need a battery boost to start. • Use high voltage ac output with a step-down transformer and rectifier for long transmission distance. ...
... DC Alternator (automotive) • May be rewound for lower rpm at low head. • The field may need a battery boost to start. • Use high voltage ac output with a step-down transformer and rectifier for long transmission distance. ...
Handout for ALTIVAR 18 AC Drives
... Braking torque: 30% of nominal torque without braking resistor (typical value) Up to 150% with optional braking resistor Analog inputs: 2 voltage analog inputs: 0 to +10 V 1 current analog input: 0-20 mA or 4-20 mA Logic inputs: 4 optically isolated logic inputs Logic output: 1 programmable PLC-comp ...
... Braking torque: 30% of nominal torque without braking resistor (typical value) Up to 150% with optional braking resistor Analog inputs: 2 voltage analog inputs: 0 to +10 V 1 current analog input: 0-20 mA or 4-20 mA Logic inputs: 4 optically isolated logic inputs Logic output: 1 programmable PLC-comp ...
Techforum Newsletter August 2011
... popular, sinusoidal PWM (SPWM) is the most straightforward method used to vary drives' motor voltage (or current) and frequency. With SPWM control quasi-sinusoidal, variablepulse-width output is constructed from intersections of a saw-toothed carrier frequency signal with a modulating sinusoidal sig ...
... popular, sinusoidal PWM (SPWM) is the most straightforward method used to vary drives' motor voltage (or current) and frequency. With SPWM control quasi-sinusoidal, variablepulse-width output is constructed from intersections of a saw-toothed carrier frequency signal with a modulating sinusoidal sig ...
E & M
... • Ac current: already changing B field (B= uIN/L where L= solenoid length • transfers voltage w/o connecting them • New voltage depends on N turns (2x turns, 2x voltage, but ½ current) ...
... • Ac current: already changing B field (B= uIN/L where L= solenoid length • transfers voltage w/o connecting them • New voltage depends on N turns (2x turns, 2x voltage, but ½ current) ...
ECE320 Chapter 6
... They are relatively easy to fabricate, rugged and reliable, and find their way into most applications. For variable speed applications, inexpensive power electronics can be used along with computer hardware and this has allowed induction machines to become more versatile. In particular, vector or fi ...
... They are relatively easy to fabricate, rugged and reliable, and find their way into most applications. For variable speed applications, inexpensive power electronics can be used along with computer hardware and this has allowed induction machines to become more versatile. In particular, vector or fi ...
Doubly-fed induction generator (DFIG) as a hybrid of asynchronous
... is VR = sVRS + VRsy . This is because looking at the rotor in its original rotor frequency ωr = sωs , the rotor impedance is Rr + jsωs Lrl . As jsωs Lrl dominates over Rr , the voltage component sVRS is chosen to ensure that the rotor current magnitude |Ir | remains substantially constant over the o ...
... is VR = sVRS + VRsy . This is because looking at the rotor in its original rotor frequency ωr = sωs , the rotor impedance is Rr + jsωs Lrl . As jsωs Lrl dominates over Rr , the voltage component sVRS is chosen to ensure that the rotor current magnitude |Ir | remains substantially constant over the o ...
Electricity
... A generator is a device that converts mechanical energy into electrical energy. It is the opposite of an electric motor. Power stations use generators to produce electricity on a large scale. Mechanical energy is provided by rotating turbines that can be powered by: high-pressure steam – in coal, ...
... A generator is a device that converts mechanical energy into electrical energy. It is the opposite of an electric motor. Power stations use generators to produce electricity on a large scale. Mechanical energy is provided by rotating turbines that can be powered by: high-pressure steam – in coal, ...
AEG - Electric Motors - Koronka Manufacturing
... For motors without regreasing device, grease has to be renewed or bearings have to be changed after 2 years at the latest. Even minor corrosion can considerably shorten the service life of the bearings. Bearings that need not be replaced should be packed with new grease. For grease type and quantity ...
... For motors without regreasing device, grease has to be renewed or bearings have to be changed after 2 years at the latest. Even minor corrosion can considerably shorten the service life of the bearings. Bearings that need not be replaced should be packed with new grease. For grease type and quantity ...
T25102106
... IV.SIMULINK IMPLIMENTATION OF DFIG: Based on the control strategy discussed above, Fig.6 shows the rotor side converter control strategy with current regulated PWM. A currentregulated PWM voltage source inverter provides field oriented currents iqr and idr to the rotor circuit, controlling active po ...
... IV.SIMULINK IMPLIMENTATION OF DFIG: Based on the control strategy discussed above, Fig.6 shows the rotor side converter control strategy with current regulated PWM. A currentregulated PWM voltage source inverter provides field oriented currents iqr and idr to the rotor circuit, controlling active po ...
DESIGN AND FABRICATION OF SINGLE PHASE INDUCTION
... conductors by the transformer action. The starting torque in the motor is developed by adjusting the position of the short-circuited brushes on the commutator [1]. Principle of operation A single phase Ac motor with transformer action coupling between the windings of the stator and rotor. The stator ...
... conductors by the transformer action. The starting torque in the motor is developed by adjusting the position of the short-circuited brushes on the commutator [1]. Principle of operation A single phase Ac motor with transformer action coupling between the windings of the stator and rotor. The stator ...
24_Banach_newp - Instytut Maszyn, Napędów i Pomiarów
... Unfortunately the considerations that can be encountered in the literature are made with many simplifications such as [1–5]: – linearization of a magnetization characteristic, – using of an electric torque instead a torque on the shaft, – neglecting of stray losses. The results of calculations for t ...
... Unfortunately the considerations that can be encountered in the literature are made with many simplifications such as [1–5]: – linearization of a magnetization characteristic, – using of an electric torque instead a torque on the shaft, – neglecting of stray losses. The results of calculations for t ...
BT044436441
... Mrs.G. Kusuma et al Int. Journal of Engineering Research and Applications ISSN : 2248-9622, Vol. 4, Issue 4( Version 1), April 2014, pp.436-441 distributed winding), or can be wound as one coil on the magnetic pole. The magnetization of the permanent magnets and their displacement on the rotor are ...
... Mrs.G. Kusuma et al Int. Journal of Engineering Research and Applications ISSN : 2248-9622, Vol. 4, Issue 4( Version 1), April 2014, pp.436-441 distributed winding), or can be wound as one coil on the magnetic pole. The magnetization of the permanent magnets and their displacement on the rotor are ...
... any math. Why? Hint: Think about the key relationships between the electrical and mechanical terminal variables. e) The load torque is now set to 10N-m. What is the new steady-state current? f) The load torque is still set to 10N-m and the field current is reduced to 0.5A. In steady-state, what is t ...
Actuators
... - idea behind a motor: use this force to do some mechanical work • a conductor of length L moving with speed S through a magnetic field B has a potential difference between its ends V = k2BLS where the constant k2 depends on geometry - idea behind a generator: use this potential difference to genera ...
... - idea behind a motor: use this force to do some mechanical work • a conductor of length L moving with speed S through a magnetic field B has a potential difference between its ends V = k2BLS where the constant k2 depends on geometry - idea behind a generator: use this potential difference to genera ...
Introduction to Motors - University of Nebraska Omaha
... Electrical current flowing in a loop of wire will produce a magnetic field across the loop. When this loop is surrounded by the field of another magnet, the loop will turn, producing a force (called torque) that results in mechanical motion. ...
... Electrical current flowing in a loop of wire will produce a magnetic field across the loop. When this loop is surrounded by the field of another magnet, the loop will turn, producing a force (called torque) that results in mechanical motion. ...
Oct - Directorate General of Shipping
... 5. Autotransformer starters or compensators are sometimes used with polyphase induction motors to ______________ . (a) reduce the voltage applied to the motor during the starting period (b) increase the volt age for "across-the-line starting" (c) provide a backup means of voltage regulation for eme ...
... 5. Autotransformer starters or compensators are sometimes used with polyphase induction motors to ______________ . (a) reduce the voltage applied to the motor during the starting period (b) increase the volt age for "across-the-line starting" (c) provide a backup means of voltage regulation for eme ...
CHAPTER 4. DESIGN of EXPERIMENTAL INDUCTION MOTOR DRIVE SYSTEM. -
... and of generating digital outputs signals [BED 2] [BED 3]. Finally, it has been pointed out the main problems due to the limitations of the real systems. It has been suggested a way to overcome the mentioned limitations keeping the proper performance of the system. Simulated results are shown to val ...
... and of generating digital outputs signals [BED 2] [BED 3]. Finally, it has been pointed out the main problems due to the limitations of the real systems. It has been suggested a way to overcome the mentioned limitations keeping the proper performance of the system. Simulated results are shown to val ...
Induction motor
An induction or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor therefore does not require mechanical commutation, separate-excitation or self-excitation for all or part of the energy transferred from stator to rotor, as in universal, DC and large synchronous motors. An induction motor's rotor can be either wound type or squirrel-cage type.Three-phase squirrel-cage induction motors are widely used in industrial drives because they are rugged, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFDs) in variable-speed service. VFDs offer especially important energy savings opportunities for existing and prospective induction motors in variable-torque centrifugal fan, pump and compressor load applications. Squirrel cage induction motors are very widely used in both fixed-speed and variable-frequency drive (VFD) applications. Variable voltage and variable frequency drives are also used in variable-speed service.