BRUSHLESS DC MOTOR
... on the accurate position with stator. • Detected by Hall Sensor, mounted on rotor, shifted at 60º or 120º phase shift. • Electronic commutation used to vary the PWM duty-cycle for speed control, using software. ...
... on the accurate position with stator. • Detected by Hall Sensor, mounted on rotor, shifted at 60º or 120º phase shift. • Electronic commutation used to vary the PWM duty-cycle for speed control, using software. ...
95MET-2
... A shunt motor supplied at 230 V runs at 900 rpm. When the armature current is 30 A, the resistance of the armature circuit is 0.4 , calculate the resistance required in series with the armature circuit to reduce the speed to 500 rpm. Assume that the armature current is 25 Amps. 8. Explain how rotat ...
... A shunt motor supplied at 230 V runs at 900 rpm. When the armature current is 30 A, the resistance of the armature circuit is 0.4 , calculate the resistance required in series with the armature circuit to reduce the speed to 500 rpm. Assume that the armature current is 25 Amps. 8. Explain how rotat ...
AC Machines
... At the end of this section you will be able to: Identify the basic components of a 3Ø induction ...
... At the end of this section you will be able to: Identify the basic components of a 3Ø induction ...
Synchronous Motor
... • Constant-speed machine • Propulsion for SS “Queen Elizabeth II” – 44 MW – 10 kV – 60 Hz – 50 pole – 144 r/min ...
... • Constant-speed machine • Propulsion for SS “Queen Elizabeth II” – 44 MW – 10 kV – 60 Hz – 50 pole – 144 r/min ...
AVOP-ELEKTRO-SKA-006
... rotary electric machine where it‘s magnetic circuit is divided by the small gap into two parts: the stator and the rotor. Both parts have a winding. One winding (usually on the stator) is connected to the source of the alternating current and the other (usually on the rotor) is connected on short di ...
... rotary electric machine where it‘s magnetic circuit is divided by the small gap into two parts: the stator and the rotor. Both parts have a winding. One winding (usually on the stator) is connected to the source of the alternating current and the other (usually on the rotor) is connected on short di ...
AC Motors - apolloteched / FrontPage
... commutators, and field coils • These motors can use ac or dc voltages. • High torque and varying motor speed are two properties of the universal motor – Inductive reactance affects current flow in the coils – The resistance of the coil to ac current flow requires greater ac voltages to develop motor ...
... commutators, and field coils • These motors can use ac or dc voltages. • High torque and varying motor speed are two properties of the universal motor – Inductive reactance affects current flow in the coils – The resistance of the coil to ac current flow requires greater ac voltages to develop motor ...
model test ( sem-iii)
... rated speed of 715 r.p.m How many poles are there in the rotating magnetic field? A. 2 poles B. 4 poles C. 6 poles D. 8 poles 6.For a small capacity induction motor, the type of starter used is …….. A. star-delta starter B. D.O.L starter C. auto transformer starter D. step-down transformer starter. ...
... rated speed of 715 r.p.m How many poles are there in the rotating magnetic field? A. 2 poles B. 4 poles C. 6 poles D. 8 poles 6.For a small capacity induction motor, the type of starter used is …….. A. star-delta starter B. D.O.L starter C. auto transformer starter D. step-down transformer starter. ...
Dynamic Braking of Induction Motors
... Capacitor Braking Method • Disconnect the motor from the line and connect a capacitor bank to the stator terminals. • Motor behaves as a self-excited induction generator. • Rotational energy is dissipated as I2R losses in the rotor and stator windings. • Increase the effect by adding resistor load. ...
... Capacitor Braking Method • Disconnect the motor from the line and connect a capacitor bank to the stator terminals. • Motor behaves as a self-excited induction generator. • Rotational energy is dissipated as I2R losses in the rotor and stator windings. • Increase the effect by adding resistor load. ...
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.
