1 - Portal UniMAP
... 8. The armature winding of a dc motor has 320 conductors, only 70 % of which lie directly under the poles, where the flux density B = 1.1 T. The armature diameter is 26 cm and its length is 18 cm. The conductor current is 12 A. Determine: a) The total force created by the conductor. b) The torque de ...
... 8. The armature winding of a dc motor has 320 conductors, only 70 % of which lie directly under the poles, where the flux density B = 1.1 T. The armature diameter is 26 cm and its length is 18 cm. The conductor current is 12 A. Determine: a) The total force created by the conductor. b) The torque de ...
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... the current is said to contain harmonics. If a line reactor is installed, the peaks of the line current are reduced and broadened out. This makes the current more sinusoidal, lowering the harmonic level to around 35% when a properly sized reactor is used. 3. Output AC reactor When the motor inductan ...
... the current is said to contain harmonics. If a line reactor is installed, the peaks of the line current are reduced and broadened out. This makes the current more sinusoidal, lowering the harmonic level to around 35% when a properly sized reactor is used. 3. Output AC reactor When the motor inductan ...
Document
... A transformer has 320 turns in the primary coil and 120 in the secondary coil. What kind of transformer is this, and by what factor does it change the voltage? By what factor does it change the current? ...
... A transformer has 320 turns in the primary coil and 120 in the secondary coil. What kind of transformer is this, and by what factor does it change the voltage? By what factor does it change the current? ...
K Direct Torque Control of Induction Motor Using Space
... out-of-phase component in the magnetic field, which imparts to the field sufficient rotational character to start the motor. Starting torque is very low and efficiency is also reduced. Such shaded-pole motors are typically used in low-power applications with low or zero starting torque requirements, ...
... out-of-phase component in the magnetic field, which imparts to the field sufficient rotational character to start the motor. Starting torque is very low and efficiency is also reduced. Such shaded-pole motors are typically used in low-power applications with low or zero starting torque requirements, ...
Signal Injection in Sensorless PMSM Drives Equipped With Inverter
... and produce bearing currents. Voltage harmonics cause acoustic noise and power losses; the losses caused by eddy currents are a special concern in high-speed solid-rotor motors. ...
... and produce bearing currents. Voltage harmonics cause acoustic noise and power losses; the losses caused by eddy currents are a special concern in high-speed solid-rotor motors. ...
Sample Exam Solution
... • In the first 3 cases, the best solution would be to start the using an external field and use contacts or switches to transfer it to a shunt self excited connection after the flux had built u sufficiently. This could be accomplished with a relatively small dc supply. • If the generator must supply ...
... • In the first 3 cases, the best solution would be to start the using an external field and use contacts or switches to transfer it to a shunt self excited connection after the flux had built u sufficiently. This could be accomplished with a relatively small dc supply. • If the generator must supply ...
Determination of synchronous motor vibrations due to
... These motors have been designed to have the same speed, torque and stator. They differ only in the magnetic structure of their rotors. The first motor has tangentially oriented magnets and the second motor has radially oriented magnets. By means of ferromagnetic materials placed between two tangenti ...
... These motors have been designed to have the same speed, torque and stator. They differ only in the magnetic structure of their rotors. The first motor has tangentially oriented magnets and the second motor has radially oriented magnets. By means of ferromagnetic materials placed between two tangenti ...
Chapter 16: Electromagnets and Induction
... Consider the transformer between the outside power lines and your house: 1. The primary coil is connected to outside power lines. Current in the primary coil creates a magnetic field through the secondary coil. The primary coil’s field is shown by the magnetic field ...
... Consider the transformer between the outside power lines and your house: 1. The primary coil is connected to outside power lines. Current in the primary coil creates a magnetic field through the secondary coil. The primary coil’s field is shown by the magnetic field ...
... The dielectric response analyzer is used for off-line insulation diagnosis for generators and motors and is also applicable to transformers. It measures the charging and discharging currents (also called polarization and depolarization currents or PDC) of the winding of stator or rotor insulation. T ...
Charging Systems - Linn–Benton Community College
... Practice with Diode Patterns • Different alternator diodes give slightly different diode patterns • If you look at many different alternator diode patterns you will learn to quickly spot bad diodes • Defective diodes can cause many engine performance problems ...
... Practice with Diode Patterns • Different alternator diodes give slightly different diode patterns • If you look at many different alternator diode patterns you will learn to quickly spot bad diodes • Defective diodes can cause many engine performance problems ...
DC Motors - ReshimNa5.ru
... DC Motors How they work, in 4 parts -- 12 November, 2001 History and background At the most basic level, electric motors exist to convert electrical energy into mechanical energy. This is done by way of two interacting magnetic fields -- one stationary, and another attached to a part that can move. ...
... DC Motors How they work, in 4 parts -- 12 November, 2001 History and background At the most basic level, electric motors exist to convert electrical energy into mechanical energy. This is done by way of two interacting magnetic fields -- one stationary, and another attached to a part that can move. ...
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.