The synchronous speed of a 3-phase induc- tion motor having 20 poles and connected to a 50 Hz source is ......
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- Plot the open circuit curve of a DC shunt Generator for a speed of 1200 rpm and 1500 rpm.A three-phase induction motor is supplied with power from a 60-Hz source. At full load the motor speedis 1728 rpm, and at no load the speed is nearly 1800 rpm. At full-load conditions, determine thefollowing:a) Number of polesb) Slipc) Frequency of the rotor voltagesThe winding impedances under starting conditions for a 60-Hz 0.5-hp motor are shown in Figure P16.54. Determine the capacitance C needed so that the phase angle between the currents Ia and Im is 90°.
- Consider the two-pole two-phase induction motor having two windings displaced 90° in space shown in Figure P16.8. The fields produced by the windings are given by Ba=Kia(t) cos(θ) and Bb=Kib(t) cos(θ−90°). The two-phase source produces currents given by ia(t)=Im cos(ωt) and ib(t)=Im cos(ωt−90°). Show that the total field rotates. Determine the speed and direction of rotation. Also find the maximum flux density of the rotating field in terms of K and Im.Consider the two-pole two-phase induction motor having two windings displaced 90° in space shown in Figure P16.8. The fields produced by the windings are given by Ba=Kia(t) cos(θ) and Bb=Kib(t) cos(θ−90°). The two-phase source produces currents given by ia(t)=Im cos(2ωt) and ib(t)=Im cos(2ωt+90°). Show that the total field rotates. Determine the speed and direction of rotation. Also find the maximum flux density of the rotating field in terms K and Im.The shunt field winding of the DC motor has many turns of fine wire. Select one: True False
- Write a short repont about using internet of things (loT) in speed control af a three- phase induction Motor.A single- stack, 3- phase VR motor has a step angle of 20° Find . the number of its rotor and stator poles?A seperately excited DC generator has a no load voltage of 127 V, Ra= 0.02 ohm and Rsh=15 ohm. Find the armature current when the generator terminal voltage is 120 V on load.
- In a 3-phase induction motor, express the mechanical power developed, in terms of air gap power Pg.Why do we need to have brushes in a squirrel-cage rotor type induction motor? (short answer)Label values of a three-phase ASM 50 Hp 60-Hz Y / ∆ 800V / 460V 34A / 59A cos (Q) = 0.85 p = 4 nm = 1425 It is given in rpm. a.) Find the value of the total losses of this asynchronous. b.) What is the speed of the rotary magnetic field if the rotor speed is 950 rpm while the load moment of this asynchronous is 240 Nm? c.) This asynchronous motor rotates at 2350 rpm and its load torque is 180 Nm. Accordingly, rotary magnetic Find the velocity of the field.