a 240v, 4pole shunt motor running at 1000 r.p.m gives 15 hp with an armature current...

a 240v, 4pole shunt motor running at 1000 r.p.m gives 15 hp with an armature current of 50 A and field current of 1 A. the armature winding is wave connected and has 540 conductors. the armature resistance is 0.1 ohm and drop at each brush is 1v. find (i) useful torque, (ii) the total torque (iii) useful flux per pole, (iv) iron and friction losses

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 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...

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,...

A shunt motor has a supply voltage of 200 V and armature resistance of 3.6 Ω....

A shunt motor has a supply voltage of 200 V and armature resistance of 3.6 Ω. At certain torque the motor run at speed = 1200 R.P.M and take a current of 10 Amp from the supply and its field current is 0.5 Amp. Find starting torque, no-load speed, and the load torque when the current supplied by the supply is 5 Amp.

a water pumping company wants to purchase an electric motor rated at 15 Hp for 1000$(...

a water pumping company wants to purchase an electric motor rated at 15 Hp for 1000$( 1 HP= 0.7457kw ). the service life of motor is known to be 10 years with negligible salvage value.its full load efficiency is 85%. the cost of energy is 0.08$ per kWhr. the intended of the motor is 4000 hours per year .Determine the present worth for the total cost of owning and operating the motor at 10% interest rate A-19,695 $ B- 26,875...

A 5-kW, 250-V shunt motor has an armature resistance of 0.1 ? and a field-circuit resistance...

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A 440 VDC, 60hp, cumulative compound long shunt motor has an armature resistance of .1 Ohm,...

A 440 VDC, 60hp, cumulative compound long shunt motor has an armature resistance of .1 Ohm, a series field resistance of ??? Ohms and a shunt field resistance of 80 Ohms. The brush drop is a constant 2 volts. The stray losses are 2.5 kW. The CEMF at rated load is 393 volts. Draw the electrical circuit, then determine the following for the above conditions: A. The armature current: B. The power developed by the armature: C. The resistance of...

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...

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...

Problem: A PM DC motor has the following parameters: Rated Power 10 hp; Rated armature voltage...

Problem: A PM DC motor has the following parameters: Rated Power 10 hp; Rated armature voltage 230 V-DC; Rated RPM: 1800; Armature Resistance: 0.2 Ohm Armature Inductance: 0.005 H Inertia (motor plus mechanical load): 0.1 kgm^2; Viscous friction coefficient: 0.015 Nms 1. Compute the voltage constant of the motor. Also compute the rated current and rated torque of the motor (obtained at the rated RPM). If the motor is supplied by 230 V across the armature, and the only torque...

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