Question Bank Solutions
... What is meant by back emf? Explain its significance. Dec 2013,June 2013 Significance of Back E.M.F. It is seen in the generating action, that when a conductor cuts the lines of flux, e.m.f. gets induced in the conductor. The question is obvious that in a d.c. motor, after a motoring action, armature ...
... What is meant by back emf? Explain its significance. Dec 2013,June 2013 Significance of Back E.M.F. It is seen in the generating action, that when a conductor cuts the lines of flux, e.m.f. gets induced in the conductor. The question is obvious that in a d.c. motor, after a motoring action, armature ...
Mechanical Dynamics, the Swing Equation, Units 1.0 Preliminaries
... network and the machine terminals, the less will be the reduction on V, and consequently, the less will be the reduction on Pe (see (10)) and also Te (see (11)). The fault location is something we cannot control of course. But there is another way to prevent reduction in V, ...
... network and the machine terminals, the less will be the reduction on V, and consequently, the less will be the reduction on Pe (see (10)) and also Te (see (11)). The fault location is something we cannot control of course. But there is another way to prevent reduction in V, ...
Large Rotator Manual
... Area under fixture must be cordoned off at all times and kept clear of all personnel. Do not connect or disconnect under load. Ensure power supply is off when connecting to controller. Never operate with any covers removed. No personal within range of motion of the rotator during operation. Observe ...
... Area under fixture must be cordoned off at all times and kept clear of all personnel. Do not connect or disconnect under load. Ensure power supply is off when connecting to controller. Never operate with any covers removed. No personal within range of motion of the rotator during operation. Observe ...
EEEB283 Electrical Machines & Drives
... • Part of voltage waveform applied • Distorted voltage and current waveforms (creates harmonics) ...
... • Part of voltage waveform applied • Distorted voltage and current waveforms (creates harmonics) ...
No. CIHT:JAL:P:499(Vol.iv): Dated: / / 2010 (In reply, please quote
... - (1) AC Resistors = 10K/200Wx3 phases / 6 taps (2) DC Resistors = 750E/400W/6 taps. - LC Load 15A panel (A) Inductive Load = 0.75H/3H/300mAX3 Nos. (B) Captivative Load = 1.25μ/2.5μ/5μ/415VX3 Nos. ...
... - (1) AC Resistors = 10K/200Wx3 phases / 6 taps (2) DC Resistors = 750E/400W/6 taps. - LC Load 15A panel (A) Inductive Load = 0.75H/3H/300mAX3 Nos. (B) Captivative Load = 1.25μ/2.5μ/5μ/415VX3 Nos. ...
Types of motor starters - Schneider Electric Belgique
... b the CT’s ratio must be selected in accordance with the fuses characteristics in order keep the thermal image protection ( 30/1 CT’s available): v sensor rating is generally choosen higher than motor normal current x 1.3 (then “most probable choice”) v thermal image protection (ANSI 49) setting req ...
... b the CT’s ratio must be selected in accordance with the fuses characteristics in order keep the thermal image protection ( 30/1 CT’s available): v sensor rating is generally choosen higher than motor normal current x 1.3 (then “most probable choice”) v thermal image protection (ANSI 49) setting req ...
Experiment Title
... shown in Fig.2 of the lab handout). However, the control method of this part enables one to maintain the induction motor at any speed from 0 to 1500 rpm. Explain what makes it possible to attain this wider controllable speed range. The voltage control approach only allows for movement up or down the ...
... shown in Fig.2 of the lab handout). However, the control method of this part enables one to maintain the induction motor at any speed from 0 to 1500 rpm. Explain what makes it possible to attain this wider controllable speed range. The voltage control approach only allows for movement up or down the ...
Making Motors Dance Our Tune
... • Magnetic fields do induce electrical fields and flux flow through solids does produce heating • Magnets don’t like heat (loose magnetism) • Can combat with expensive magnets (get up to about 300 F) • Can put air blown cooling systems or such on the coupling ...
... • Magnetic fields do induce electrical fields and flux flow through solids does produce heating • Magnets don’t like heat (loose magnetism) • Can combat with expensive magnets (get up to about 300 F) • Can put air blown cooling systems or such on the coupling ...
Dc motors - WordPress.com
... 1. Vary the voltage supplied to the armature circuit while holding the field constant. 2. Vary the field current while holding the armature supply voltage constant. ...
... 1. Vary the voltage supplied to the armature circuit while holding the field constant. 2. Vary the field current while holding the armature supply voltage constant. ...
DC Machine lab
... A question that often arises is how the torque forces produced by the motor are neutralized, or equally opposed. The basic concept, from Newtonian mechanics, is that for every force there is an equal and opposite force that brings the entire system into equilibrium. A primary force (torque) is creat ...
... A question that often arises is how the torque forces produced by the motor are neutralized, or equally opposed. The basic concept, from Newtonian mechanics, is that for every force there is an equal and opposite force that brings the entire system into equilibrium. A primary force (torque) is creat ...
module-5 - SNGCE DIGITAL LIBRARY
... Since the transducers are generally used both as transmitters and receivers, the difference in travel time can be determined with the same pair of transducers. Thus, the mean axial velocity along the path is given by: ...
... Since the transducers are generally used both as transmitters and receivers, the difference in travel time can be determined with the same pair of transducers. Thus, the mean axial velocity along the path is given by: ...
doubly fed induction generator in a wind turbine
... The inductance Lm is strictly property to the magnetic circuit (i.e, the core material, the geometry, and the number of turns), provided that the operation is in the linear range of the magnetic material. In larger machine the Lm [p.u.] normally increases because of smaller air gap length. Reactive ...
... The inductance Lm is strictly property to the magnetic circuit (i.e, the core material, the geometry, and the number of turns), provided that the operation is in the linear range of the magnetic material. In larger machine the Lm [p.u.] normally increases because of smaller air gap length. Reactive ...
CHAPTER 4. DESIGN of EXPERIMENTAL INDUCTION MOTOR DRIVE SYSTEM. -
... Armature voltage: 200V. Maximum stable armature current: 20A. Maximum peak armature current: 90A. Armature resistance (at 25 o C): 0.31W. ...
... Armature voltage: 200V. Maximum stable armature current: 20A. Maximum peak armature current: 90A. Armature resistance (at 25 o C): 0.31W. ...
Predictive Torque Control Scheme for Three-Phase Four
... the purpose of minimizing the components’ cost, and it is named four-switch three-phase (B4) inverter in comparison with the B6 one, Although this kind of cost reduction is at the expense of output performance, the B4 inverter can be utilized in fault-tolerant control to solve the ooen/short-circuit ...
... the purpose of minimizing the components’ cost, and it is named four-switch three-phase (B4) inverter in comparison with the B6 one, Although this kind of cost reduction is at the expense of output performance, the B4 inverter can be utilized in fault-tolerant control to solve the ooen/short-circuit ...
Biomechanics of Lifting
... Vertical travel distance of object Frequency of Lift (lifts per minute) Duration of lifting ...
... Vertical travel distance of object Frequency of Lift (lifts per minute) Duration of lifting ...
Mechanisms - DOWNEND SCHOOL
... Levers in action Levers are very simple machines. If you look you will see examples of levers all around. ...
... Levers in action Levers are very simple machines. If you look you will see examples of levers all around. ...
Document
... DC motors provide a range of performance: DC brush: versatile, “servo” motor, high speed, torque DC brushless: speed/toque depend on electronics Stepper: simple control signals, variable speed/accuracy without gearing, lower power Direct-drive (torque) motors, expensive, lower torque ...
... DC motors provide a range of performance: DC brush: versatile, “servo” motor, high speed, torque DC brushless: speed/toque depend on electronics Stepper: simple control signals, variable speed/accuracy without gearing, lower power Direct-drive (torque) motors, expensive, lower torque ...
ED-21 Analog Output Series Packaged Magnetic Encoder
... 900 McKay Road, Unit 3, Pickering, ON L1W 3X8 ...
... 900 McKay Road, Unit 3, Pickering, ON L1W 3X8 ...
Techforum Newsletter August 2011
... in 1983, the insulated-gate bipolar transistor (IGBT) has in the past two decades come to dominate VFDs as an inverter switching device. In variable-torque applications suited for Volts per Hertz (V/Hz) drive control, AC motor characteristics require that the voltage magnitude of the inverter's out ...
... in 1983, the insulated-gate bipolar transistor (IGBT) has in the past two decades come to dominate VFDs as an inverter switching device. In variable-torque applications suited for Volts per Hertz (V/Hz) drive control, AC motor characteristics require that the voltage magnitude of the inverter's out ...
Unit – 7
... becoming increasingly popular,[15]sinusoidal PWM (SPWM) is the most straightforward method used to vary drives' motor voltage (or current) and frequency. With SPWM control (see Fig. 1), quasisinusoidal, variable-pulse-width output is constructed from intersections of a saw-toothed carrier frequency ...
... becoming increasingly popular,[15]sinusoidal PWM (SPWM) is the most straightforward method used to vary drives' motor voltage (or current) and frequency. With SPWM control (see Fig. 1), quasisinusoidal, variable-pulse-width output is constructed from intersections of a saw-toothed carrier frequency ...
Elec467 Power Machines & Transformers
... Dynamic braking is the slowing down of a machine by connecting the motor to a braking circuit. There are two types of braking circuits: DC injection or capacitive braking. Seen above is DC injection that operates by opening the contactor on the input AC lines and closing thru the contactors from the ...
... Dynamic braking is the slowing down of a machine by connecting the motor to a braking circuit. There are two types of braking circuits: DC injection or capacitive braking. Seen above is DC injection that operates by opening the contactor on the input AC lines and closing thru the contactors from the ...
Word
... network and the machine terminals, the less will be the reduction on V, and consequently, the less will be the reduction on Pe (see (10)) and also Te (see (11)). The fault location is something we cannot control of course. But there is another way to prevent reduction in V, and that is through excit ...
... network and the machine terminals, the less will be the reduction on V, and consequently, the less will be the reduction on Pe (see (10)) and also Te (see (11)). The fault location is something we cannot control of course. But there is another way to prevent reduction in V, and that is through excit ...
Torque‐Speed Measurements
... FLIR MCS pan‐tilt units (PTUs) have traditionally been specified in terms of payload weight. However, performance will vary greatly depending on payload configuration and balancing. A more precise way to determine system performance is to use dynamic torque. This technical note describes the MCS P ...
... FLIR MCS pan‐tilt units (PTUs) have traditionally been specified in terms of payload weight. However, performance will vary greatly depending on payload configuration and balancing. A more precise way to determine system performance is to use dynamic torque. This technical note describes the MCS P ...
Torque Ripple Calculation of the Two
... reasons why another concept of the water pump was developed, in which the rotor of the motor is immersed into pumping water. In this solution the rotor of the motor is exposed to chemically aggressive water. A squirrel-cage rotor cannot be used, but a ferrite permanent magnet rotor seems to be a goo ...
... reasons why another concept of the water pump was developed, in which the rotor of the motor is immersed into pumping water. In this solution the rotor of the motor is exposed to chemically aggressive water. A squirrel-cage rotor cannot be used, but a ferrite permanent magnet rotor seems to be a goo ...
INTRODUCTION. -
... These facts are due to the induction motors advantages over the rest of motors. The main advantage is that induction motors do not require an electrical connection between stationary and rotating parts of the motor. Therefore, they do not need any mechanical commutator (brushes), leading to the fact ...
... These facts are due to the induction motors advantages over the rest of motors. The main advantage is that induction motors do not require an electrical connection between stationary and rotating parts of the motor. Therefore, they do not need any mechanical commutator (brushes), leading to the fact ...
Dynamometer
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A dynamometer or ""dyno"" for short, is a device for measuring force, torque, or power. For example, the power produced by an engine, motor or other rotating prime mover can be calculated by simultaneously measuring torque and rotational speed (RPM).A dynamometer can also be used to determine the torque and power required to operate a driven machine such as a pump. In that case, a motoring or driving dynamometer is used. A dynamometer that is designed to be driven is called an absorption or passive dynamometer. A dynamometer that can either drive or absorb is called a universal or active dynamometer.In addition to being used to determine the torque or power characteristics of a machine under test (MUT), dynamometers are employed in a number of other roles. In standard emissions testing cycles such as those defined by the United States Environmental Protection Agency (US EPA), dynamometers are used to provide simulated road loading of either the engine (using an engine dynamometer) or full powertrain (using a chassis dynamometer). In fact, beyond simple power and torque measurements, dynamometers can be used as part of a testbed for a variety of engine development activities, such as the calibration of engine management controllers, detailed investigations into combustion behavior, and tribology.In the medical terminology, hand-held dynamometers are used for routine screening of grip and hand strength, and the initial and ongoing evaluation of patients with hand trauma or dysfunction. They are also used to measure grip strength in patients where compromise of the cervical nerve roots or peripheral nerves is suspected.In the rehabilitation, kinesiology, and ergonomics realms, force dynamometers are used for measuring the back, grip, arm, and/or leg strength of athletes, patients, and workers to evaluate physical status, performance, and task demands. Typically the force applied to a lever or through a cable is measured and then converted to a moment of force by multiplying by the perpendicular distance from the force to the axis of the level.