DC Drives
... Regenerative Braking (in Q2) • Say the motor running at position A. Suddenly va is reduced (below eg). The current ia will reverse direction.Operating point is shifted to B. • Since ia is negative, torque Te is negative. • Power is also negative, which implies power is “generated” back to the suppl ...
... Regenerative Braking (in Q2) • Say the motor running at position A. Suddenly va is reduced (below eg). The current ia will reverse direction.Operating point is shifted to B. • Since ia is negative, torque Te is negative. • Power is also negative, which implies power is “generated” back to the suppl ...
FPGA-based Servo Control IC for PMLSM Drives with Adaptive
... The FSTP BLDC motor drives using the novel voltage PWM scheme have two phases to detect the back EMF, but the split capacitors cause the voltage waveform of back EMF to ...
... The FSTP BLDC motor drives using the novel voltage PWM scheme have two phases to detect the back EMF, but the split capacitors cause the voltage waveform of back EMF to ...
9. electromagnetic induction
... 3. The flux emanating out of a surface depends upon a) the area of surface (A) b) the magnetic induction (B) c) the angle enclosed between the direction of magnetic field and the normal to the surface (at θ ) 4. Electromagnetic induction : i) The phenomenon of production of electromotive force on ac ...
... 3. The flux emanating out of a surface depends upon a) the area of surface (A) b) the magnetic induction (B) c) the angle enclosed between the direction of magnetic field and the normal to the surface (at θ ) 4. Electromagnetic induction : i) The phenomenon of production of electromotive force on ac ...
Type LG Braking Modules
... AC variable frequency drives are commonly used with general purpose AC induction motors to form reliable variable speed drive systems. Problems with these drive systems can occur when an application requires a deceleration rate faster than what can be managed by the drive alone, or when motor speeds ...
... AC variable frequency drives are commonly used with general purpose AC induction motors to form reliable variable speed drive systems. Problems with these drive systems can occur when an application requires a deceleration rate faster than what can be managed by the drive alone, or when motor speeds ...
The Electric Bill
... may be a separate metal plate securely fastened to the equipment or it may be stenciled, stamped, or otherwise labeled directly on the equipment frame. The input voltage for which the equipment was designed is always given and the input watts, if not given, can be obtained by calculation. Various ot ...
... may be a separate metal plate securely fastened to the equipment or it may be stenciled, stamped, or otherwise labeled directly on the equipment frame. The input voltage for which the equipment was designed is always given and the input watts, if not given, can be obtained by calculation. Various ot ...
Modeling and Transient Analysis of Wind Generator during
... Depending on the rotor speed, there are two modes of operation in a DFIG WECS. (1) Super-synchronous mode, in which the generator operates above the synchronous speed , (2) sub synchronous mode, in which the generator operates below the synchronous speed. The slip is negative in the super-synchronou ...
... Depending on the rotor speed, there are two modes of operation in a DFIG WECS. (1) Super-synchronous mode, in which the generator operates above the synchronous speed , (2) sub synchronous mode, in which the generator operates below the synchronous speed. The slip is negative in the super-synchronou ...
Scheme of work for Year 7: Introduction
... Introduce the terms frequency and Hertz. Discuss the way in which electricity is transported (low current to avoid heat loss) and demonstrate a step up/down transformer. Mention that the current supplied must be a.c., and perhaps give a simple explanation of this. Emphasise that the core must be mag ...
... Introduce the terms frequency and Hertz. Discuss the way in which electricity is transported (low current to avoid heat loss) and demonstrate a step up/down transformer. Mention that the current supplied must be a.c., and perhaps give a simple explanation of this. Emphasise that the core must be mag ...
Welcome to this training module which looks at the hardware
... The purpose of an AC drive is to convert the current and voltage of the electric network into a form suitable for an electric motor. The electric network provides fixed voltage and frequency, whereas speed control of AC induction motors requires variable voltage and frequency. An AC drive consists ...
... The purpose of an AC drive is to convert the current and voltage of the electric network into a form suitable for an electric motor. The electric network provides fixed voltage and frequency, whereas speed control of AC induction motors requires variable voltage and frequency. An AC drive consists ...
Consequences of Harmonic Currents and Voltages Generated by
... impedance differences. Utility transformers are frequently rated to carry the total plant load. DG Sets are often only sized to carry emergency or critical loads. Thus DG Sets may have 5 to 100 times greater subtransient reactance than normal source transformers. Consequently, nonlinear loads may wo ...
... impedance differences. Utility transformers are frequently rated to carry the total plant load. DG Sets are often only sized to carry emergency or critical loads. Thus DG Sets may have 5 to 100 times greater subtransient reactance than normal source transformers. Consequently, nonlinear loads may wo ...
Software partitioning technique for an RF matching Craig S. Powers
... coefficient Γ of the load increases from zero to one. The typical power delivery profile of a RF generator looks like a cropped mountain centered on 50+j0Ω when projected in 3D on a complex plane as shown in Fig. 1. The RF generator’s ability to deliver power drops as the load impedance moves away f ...
... coefficient Γ of the load increases from zero to one. The typical power delivery profile of a RF generator looks like a cropped mountain centered on 50+j0Ω when projected in 3D on a complex plane as shown in Fig. 1. The RF generator’s ability to deliver power drops as the load impedance moves away f ...
Snímka 1
... The way for formulating the differential equations and denotation of the quantities in them are explained in animations activated by a mouse when pressing the key PLAY. The animation consists in showing “step by step” the elements of the differential equation for one phase of the stator or one “ ...
... The way for formulating the differential equations and denotation of the quantities in them are explained in animations activated by a mouse when pressing the key PLAY. The animation consists in showing “step by step” the elements of the differential equation for one phase of the stator or one “ ...
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.