A DC shunt motor drives a centrifugal pump at a speed of 1000 rpm when the...

A DC shunt motor drives a centrifugal pump at a speed of 1000 rpm when the terminal voltage and line currents are 200 V and 50 A, respectively. Given the armature resistance, Ra = 0.1 ohm and field resistance, Rf =100 ohm. Design a circuit which the speed of the motor can be controlled by using the added resistance method to the armature circuit and the maximum starting current is 120 A. Next, if the added resistance in the designed circuit above can be adjusted so that the speed is 800 – 900 rpm, analyze the minimum and maximum values of the resistance should be adjusted in the armature circuit. Then, design a circuit which the terminal voltage can be adjusted so that a conveyor can be operated at speed 745.46 rpm.

Expert Solution

Manojponduru answered 1 year ago

23 hp, dc shunt motor is running at 1000 rpm when the armature voltage is 600...

23 hp, dc shunt motor is running at 1000 rpm when the armature voltage is 600 V. The armature resistance of the motor is 0.8 ohm, and the field resistance is 900 ohm. The efficiency of the motor at full load is 92 %. a) Calculate the value of the resistance of the dynamic braking at full load. The armature current should be limited to 150% of the rated value. b) If the motor operated in regenerative braking at a...

A centrifugal pump is driven at 1300 rpm by a 10 hp motor and delivers 250...

A centrifugal pump is driven at 1300 rpm by a 10 hp motor and delivers 250 GPM at 85 Fahrenheit water against 75 ft water head, assuming that the initial pump efficiency is 65 % doesn’t vary appreciably the maximum flow the pump can deliver is most nearly

A) Refer to the diagram on “Speed Control of a Shunt Wound DC Motor. Suppose the...

A) Refer to the diagram on “Speed Control of a Shunt Wound DC Motor. Suppose the no load voltage V = 90V, Ra + R1 = 4 ohms, Rsh + RF = 130 ohms, and the motor runs at a rated speed of 1000 RPM when IL = 4 amps. What is the back EMF VB in volts when the motor runs at IL = 6 amps? Note: Type a 1-decimal number, rounded off to the nearest 0.1 B) How...

A 100 hp, 220 V, 1200 rpm DC shunt motor with an armature resistance of 0.05...

A 100 hp, 220 V, 1200 rpm DC shunt motor with an armature resistance of 0.05 ? and a field resistance of 50 ?. The motor has compensating windings, so armature reactance can be ignored. Mechanical and core losses may be ignored also. The motor is driving a drilling machine, TL ? (1/n). The motor is driving a load with a line current of 120 A and an initial speed of 1200 rpm. Assume Linear Magnetization curve i. What is...

The following details are known about a 150 hp motor, 240 V, 500 rpm, dc shunt...

The following details are known about a 150 hp motor, 240 V, 500 rpm, dc shunt motor. Nominal full load current: 500 A Insulation class: H Weight: 3400 kg Find 1.The total losses and efficiency at full load. 2.Calculate the approximate shunt filed exciting current if the shunt field causes 20% of the total losses. 3.Calculate the value of the armature resistance knowing that 50% of the total losses at full load are due to armature resistance. 4.With your calculated...

When a centrifugal pump runs at 1500 rpm, it discharges 0.05 m3 / h of water....

When a centrifugal pump runs at 1500 rpm, it discharges 0.05 m3 / h of water. The entrance and exit radii of the rotor are given as 0.05 m and 0.15 m respectively, the wing thickness at the entrance is 0.03 m, and the wing thickness at the exit is 0.01 m. The inlet and outlet vane angles are 60o and 45o respectively, and the pump mechanical efficiency is 0.85. In this case; a) What should be the theoretical head...

Problem 5) A long shunt 600 V, 1200-rpm DC motor has a series field winding resistance...

Problem 5) A long shunt 600 V, 1200-rpm DC motor has a series field winding resistance of 0.05 Ω, a shunt field winding resistance of 200 Ω, and an armature resistance of 0.1 Ω. The machine is connected to 600 V DC source. The rotational loss is 3.2 kW. If the machine draws a 100 A from the supply, calculate a. Back EMF b. Determine the machine’s converted power (or developed power) and its efficiency. c. Determine the speed regulation...

A 120+m -V , 2400+n-rpm shunt DC motor has a armature resistance 0.4+0.1*m ohm and a...

A 120+m -V , 2400+n-rpm shunt DC motor has a armature resistance 0.4+0.1*m ohm and a shunt field resistance of 160+m Ohm . The motor operates at its rated speed with full load which takes 15+m Amp. A small of current of 2+.1*m A at no load due to rotational loses. Assume that rotational loss is proportional to the speed. Find Field current at no load Armature current at no load Rotational loss at no load Armature current at Full...

Can you do brief research on : - Separetely excited DC motor applications - Shunt DC...

Can you do brief research on : - Separetely excited DC motor applications - Shunt DC motor applications - Series DC motor applications

A 400 V dc shunt motor has a rated armature current of 76 A at a...

A 400 V dc shunt motor has a rated armature current of 76 A at a speed of 1000 rpm. The armature resistance of the motor is 0.4ohm, the field resistance is 100 ohm, and the rotational losses are 0.9 kW. The load of the motor is bidirectional. Calculate the following: (a) No-load speed of the motor. (b) Motor speed, where the armature current is 60 A during regenerative braking. (c) Developed torque during regenerative braking. (d) Back electromotive force,...

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