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19. An electrical motor with rated values of 15 HP, 890 Tpm develops a torque of...
6. A DC motor coupled to a large grinder develops 120 HP at a constant moment...
6. A DC motor coupled to a large grinder develops 120 HP at a constant moment of inertia of the revolving parts is J-2,500 lbft? (a) Calculate the torque [Nm] developed by the motor usin the speed is constant, moment of inertia does not g PnT/9.55 and the fact that when become effective. (b) Calculate the motor torque [Nm] needed so that the speed will increase to 750 rpm in 5s (from 0 to 5 s). Hint: Use the equation...
1. A 15 hp, 4 pole, 208 V, 60 Hz, Y-connected, three-phase squirrel cage induction motor has the ...
1. A 15 hp, 4 pole, 208 V, 60 Hz, Y-connected, three-phase squirrel cage induction motor has the following parameters in Ω/phase referred to the stator: R,-0.220, Xi = 0.430, X,-15.0, R2 0.130 and X2-0.430. Mechanical and core losses amount to 300 W and 200 W respectively for rated voltage. (a) The motor is fed with a 60 Hz, 208 V voltage. It runs with a slip of 4.5 %. Find the speed, shaft torque and power, efficiency and power...
A three phase, 60 Hz induction motor rated at 440 V and 40 hp drives a...
A three phase, 60 Hz induction motor rated at 440 V and 40 hp drives a load at 1710 rpm. The induction motor has the following impedances referred to the stator in /phase: R,=0.1512, X,=0.7512; R2=1.222,X=0.7522; X=25 12 . The core loss is 450 W and friction and windage loss is 250 W. Calculate the following 1. line current and power factor 2. Real and reactive input power 3. Air-gap power 4. Mechanical power and torque developed 5. shaft horse...
A 30 hp, 240 V, 1150 rpm de shunt motor operating at rated conditions has an efficiency of 88.5%. The armature circuit resistance and field circuit resistance are 0.096 Ω and 936 Ω respectively. Calc...
A 30 hp, 240 V, 1150 rpm de shunt motor operating at rated conditions has an efficiency of 88.5%. The armature circuit resistance and field circuit resistance are 0.096 Ω and 936 Ω respectively. Calculate the following: (a) the armature current; b) the output torque (c) the mechanical developed power (d) the mechanical developed torque; and, e) the external resistance required in series with the armature to limit the starting torque to 200 % of rated torque. If the load...
A 10 hp, 60 Hz, three-phase induction motor is delivering rated power while running at 864...
A 10 hp, 60 Hz, three-phase induction motor is delivering rated power while running at 864 rpm. The motor is drawing power from a 208 V, three-phase source. DC tests determine: R1 0.2 ? and R2-0.15 ?, we do not know XI and X2. Ignore XM. The rotational and core losses are 200 W and 100 W respectively. Find: a) The output (shaft torque). b) The number of poles. c) The input power and efficiency d) The power factor at...
A 12-pole, brushless, DC motor has a no-load speed of 5000rpm and a stall torque of 50 in-oz when operating at rated voltage of 60V. Testing shows that no-load speed and stall torque vary linearly wi...
A 12-pole, brushless, DC motor has a no-load speed of 5000rpm and a stall torque of 50 in-oz when operating at rated voltage of 60V. Testing shows that no-load speed and stall torque vary linearly with applied voltage. Also, with a constant applied voltage the speed decreases linearly as delivered torque increases. Calculate the following: Torque that the motor delivers at 2000 rpm when operated at rated voltage. T a) b) Fundamental frequency of the applied voltage waveform at this...
MESB443, Semester 1 2018/19 QUESTION 3 [10 marks) A 200V DC shunt motor develops a rated...
MESB443, Semester 1 2018/19 QUESTION 3 [10 marks) A 200V DC shunt motor develops a rated output power of Shp at 1000rpm, drawing 25A. Having Ra=0.50 and RF = 10092, find: a) The total rotational losses of the motor at rated conditions [4 marks] b) The no-load speed of the motor at 2001. [6 marks] Answer:
Three-phase induction motor The three-phase induction motor nameplate gives the following informa...
Three-phase induction motor The three-phase induction motor nameplate gives the following information: 100 HP, 6 poles, 600 V, 60 Hz, PF =0.87. Rated motor slip s=0.0275 and rated motor current is 91.7 A. Measured at rated speed friction and ventilation losses are 1100 W. Measured between two motor terminals resistance is 0.305 Ω. f) For a load such where the motor rotates at the speed of 1180 r / min, determine shaft torque and calculate the mechanical power in HP,...
A 3-phase 50Hz 2-pole 440V (L-L rms) induction motor drive has a rated speed of 2955...
A 3-phase 50Hz 2-pole 440V (L-L rms) induction motor drive has a rated speed of 2955 rpm and rated torque of 35 Nm. This motor drives a load with a torque characteristic that increases linearly with speed such that it equals the load torque at the rated speed. It draws a current of 2.1 A(rms) per phase at the rated voltage at a power factor of 0.81 (lagging). The stator resistance Rs = 2.0 ohms. At the rated operating speed,...
The permanent DC motor model CDP3450 by ABB is rated at 1 Hp, 2 500 RMP...
The permanent DC motor model CDP3450 by ABB is rated at 1 Hp, 2 500 RMP at 90v (no load). The armature resistance is 0.425 Ohm. a. The continuous current rating of this motor is 9.7 Amp, what is the maximum continuous torque rating? b. The motor is to drive a load of 2NM torque while maintaining a constant speed of 2000 RPM. What is the required supply current and voltage? c. With 90v armature voltage, what is the maximum...
6. A DC motor coupled to a large grinder develops 120 HP at a constant moment of inertia of the revolving parts is J-2,500 lbft? (a) Calculate the torque [Nm] developed by the motor usin the speed is constant, moment of inertia does not g PnT/9.55 and the fact that when become effective. (b) Calculate the motor torque [Nm] needed so that the speed will increase to 750 rpm in 5s (from 0 to 5 s). Hint: Use the equation...
1. A 15 hp, 4 pole, 208 V, 60 Hz, Y-connected, three-phase squirrel cage induction motor has the following parameters in Ω/phase referred to the stator: R,-0.220, Xi = 0.430, X,-15.0, R2 0.130 and X2-0.430. Mechanical and core losses amount to 300 W and 200 W respectively for rated voltage. (a) The motor is fed with a 60 Hz, 208 V voltage. It runs with a slip of 4.5 %. Find the speed, shaft torque and power, efficiency and power...
A three phase, 60 Hz induction motor rated at 440 V and 40 hp drives a load at 1710 rpm. The induction motor has the following impedances referred to the stator in /phase: R,=0.1512, X,=0.7512; R2=1.222,X=0.7522; X=25 12 . The core loss is 450 W and friction and windage loss is 250 W. Calculate the following 1. line current and power factor 2. Real and reactive input power 3. Air-gap power 4. Mechanical power and torque developed 5. shaft horse...
A 30 hp, 240 V, 1150 rpm de shunt motor operating at rated conditions has an efficiency of 88.5%. The armature circuit resistance and field circuit resistance are 0.096 Ω and 936 Ω respectively. Calculate the following: (a) the armature current; b) the output torque (c) the mechanical developed power (d) the mechanical developed torque; and, e) the external resistance required in series with the armature to limit the starting torque to 200 % of rated torque. If the load...
A 10 hp, 60 Hz, three-phase induction motor is delivering rated power while running at 864 rpm. The motor is drawing power from a 208 V, three-phase source. DC tests determine: R1 0.2 ? and R2-0.15 ?, we do not know XI and X2. Ignore XM. The rotational and core losses are 200 W and 100 W respectively. Find: a) The output (shaft torque). b) The number of poles. c) The input power and efficiency d) The power factor at...
A 12-pole, brushless, DC motor has a no-load speed of 5000rpm and a stall torque of 50 in-oz when operating at rated voltage of 60V. Testing shows that no-load speed and stall torque vary linearly with applied voltage. Also, with a constant applied voltage the speed decreases linearly as delivered torque increases. Calculate the following: Torque that the motor delivers at 2000 rpm when operated at rated voltage. T a) b) Fundamental frequency of the applied voltage waveform at this...
MESB443, Semester 1 2018/19 QUESTION 3 [10 marks) A 200V DC shunt motor develops a rated output power of Shp at 1000rpm, drawing 25A. Having Ra=0.50 and RF = 10092, find: a) The total rotational losses of the motor at rated conditions [4 marks] b) The no-load speed of the motor at 2001. [6 marks] Answer:
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