IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) ISSN: 2278-1676
... Abstract : The Adjustable Speed Drives (ADS) are generally used in industry. In most drives AC motors are applied. The standard drives used are Induction Motors (IM) and recently Permanent Magnet Synchronous Motors (PMSM) are also used. Developments in power electronics and semiconductor technology ...
... Abstract : The Adjustable Speed Drives (ADS) are generally used in industry. In most drives AC motors are applied. The standard drives used are Induction Motors (IM) and recently Permanent Magnet Synchronous Motors (PMSM) are also used. Developments in power electronics and semiconductor technology ...
Teknologi Elektrik
... Even today the starter is a series dc motor However, the recent development of power electronics has reduced the use of dc motors and generators. The electronically controlled ac drives are gradually replacing the dc motor drives in factories. Nevertheless, a large number of dc motors are still used ...
... Even today the starter is a series dc motor However, the recent development of power electronics has reduced the use of dc motors and generators. The electronically controlled ac drives are gradually replacing the dc motor drives in factories. Nevertheless, a large number of dc motors are still used ...
What state and other requrements
... field does not even have to be particularly large for this effect to occur as a magnetic field strength of 2 Tesla is what many maglev trains operate on. The amount of weight a superconductor can support is limited by the strength of the magnetic field, distance from magnet, area of superconductor, ...
... field does not even have to be particularly large for this effect to occur as a magnetic field strength of 2 Tesla is what many maglev trains operate on. The amount of weight a superconductor can support is limited by the strength of the magnetic field, distance from magnet, area of superconductor, ...
Motor Sizing Principles
... motors are designed to run slightly faster than rated speed (up to a speed called synchronous speed) when they are lightly loaded. For example an induction motor with rated speed of 1450rpm may have a synchronous speed of 1500rpm and would be safe up to this speed. There is a risk of mechanical fail ...
... motors are designed to run slightly faster than rated speed (up to a speed called synchronous speed) when they are lightly loaded. For example an induction motor with rated speed of 1450rpm may have a synchronous speed of 1500rpm and would be safe up to this speed. There is a risk of mechanical fail ...
Article PSD From toys to tools
... made with an AP300 frequency response analyzer. The correlation between measurement and theory are very close for this inductor. Linear circuit model Figure 5 shows a linear circuit model that can be used to synthesize the changing values of ac resistance with frequency. A 5-step ladder network was ...
... made with an AP300 frequency response analyzer. The correlation between measurement and theory are very close for this inductor. Linear circuit model Figure 5 shows a linear circuit model that can be used to synthesize the changing values of ac resistance with frequency. A 5-step ladder network was ...
CHAPTER 18 - QUESTIONS 1-3
... 10. Identify the relationship between an electric current and a magnetic field. A current carrying wire causes a magnet to move. 11. Compare solenoids and electromagnets. Solenoids: a coil of wire with an electric current running through it. Electromagnet: a magnet that has an electric current attac ...
... 10. Identify the relationship between an electric current and a magnetic field. A current carrying wire causes a magnet to move. 11. Compare solenoids and electromagnets. Solenoids: a coil of wire with an electric current running through it. Electromagnet: a magnet that has an electric current attac ...
Department of Electrical Engineering, Southern Taiwan University
... brushless dc (BLDC) motors are widely used in a number of industrial applications because of their high power density, durability, high efficiency, silent operation, and high starting torque. An inverter-driven three-phase BLDC motor, as shown in Fig. 1, needs rotor position information to ensure st ...
... brushless dc (BLDC) motors are widely used in a number of industrial applications because of their high power density, durability, high efficiency, silent operation, and high starting torque. An inverter-driven three-phase BLDC motor, as shown in Fig. 1, needs rotor position information to ensure st ...
RECENT PROBLEMS EXPERIENCED WITH MOTOR AND GENERATOR WINDINGS
... more frequently during the past 10 years is caused by inadequate support of the coils in the endwinding area. The current flowing in the coils gives rise to a 120 Hz magnetically induced vibrational force, just as can occur in the slot, with the force being proportional to the current squared. Durin ...
... more frequently during the past 10 years is caused by inadequate support of the coils in the endwinding area. The current flowing in the coils gives rise to a 120 Hz magnetically induced vibrational force, just as can occur in the slot, with the force being proportional to the current squared. Durin ...
The DynaMotor Brushless Repulsion Motor
... The patented Electronic Brushless Reluctance motor (EBR) is an inexpensive platform for adjustable speed single phase motors Similar technology to conventional repulsion motors The EBR has no commutator or brushes Solid state switches (MOSFETs, IGBTs) used for commutation Isolated control of the com ...
... The patented Electronic Brushless Reluctance motor (EBR) is an inexpensive platform for adjustable speed single phase motors Similar technology to conventional repulsion motors The EBR has no commutator or brushes Solid state switches (MOSFETs, IGBTs) used for commutation Isolated control of the com ...
Power System Dynamics -- Postgraduate Course of Tsinghua Univ
... * S. M. is a rotating magnetic element with complex dynamic behavior. It is the heart of P. S. It * It provides active and reactive power to loads and has strong power, frequency and voltage regulation/control ...
... * S. M. is a rotating magnetic element with complex dynamic behavior. It is the heart of P. S. It * It provides active and reactive power to loads and has strong power, frequency and voltage regulation/control ...
An Improved Weighted Total Harmonic Distortion Index for Induction
... The WTHD is superior to the THD as a figure of merit for a non-sinusoidal converter waveform since the WTHD predicts the distortion in the current and subsequent additional losses which are typically the major issues in the application of such converters. However, it should be recalled that Eq. (12) ...
... The WTHD is superior to the THD as a figure of merit for a non-sinusoidal converter waveform since the WTHD predicts the distortion in the current and subsequent additional losses which are typically the major issues in the application of such converters. However, it should be recalled that Eq. (12) ...
Physics - CJM Shimla
... field intensity due to a magnetic dipole (bar magnet) along its axis and perpendicular to its axis. Torque on a magnetic dipole (bar magnet) in a uniform magnetic field; bar magnet as an equivalent solenoid, magnetic field lines; Earth’s magnetic field and magnetic elements. ...
... field intensity due to a magnetic dipole (bar magnet) along its axis and perpendicular to its axis. Torque on a magnetic dipole (bar magnet) in a uniform magnetic field; bar magnet as an equivalent solenoid, magnetic field lines; Earth’s magnetic field and magnetic elements. ...
proj-scratch-motor-ctrl - Build-It
... If the voltage between the Gate and Source of this N-channel MOSFET is < 2 volts, no current can flow between the Drain and Source terminals. The motor will not run. If the Gate to Source voltage is > 4 volts, then current will flow between the Drain and Source and the motor will run. Adjust R2 so m ...
... If the voltage between the Gate and Source of this N-channel MOSFET is < 2 volts, no current can flow between the Drain and Source terminals. The motor will not run. If the Gate to Source voltage is > 4 volts, then current will flow between the Drain and Source and the motor will run. Adjust R2 so m ...
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.