Explain how we can use the frequency for speed control of the asynchronous motor. And describe the speed-dependent torque and stator voltage changes by drawing.
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Explain how we can use the frequency for speed control of the asynchronous motor. And describe the speed-dependent torque and stator voltage changes by drawing.
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- Explain the speed-current, torque-current and speed-torque characteristics of dc series motor.Explain the speed control method for the dc motor with diagram and torque speed characteristics of each.the BLDC motors have the advantage of High Efficiency Compactness Low Maintenance All of the answers When the speed of the DC motor is Increases its Armature current Remain Constant Decreases Increases Any of the answers A variable reluctance stepper motor is constructed of .. . material with salient poles. ferromagnetic paramagnetic non-magnetic diamagnetic
- The armature resistance of 250 V DC shunt motor is 0.5 ohm. Its armature current is 20 A when running at 1200 rpm and develops full-load torque. What resistance must be inserted in series with the armature to reduce the speed to 600 rpm at the same torque, and what will be the speed if the load torque is halved with this resistance in the circuit. Assume the flux to remain constant throughout and neglect brush contact drop. *A 220 V dc shunt motor develops a total torque of 100 N-M and takes 29A at 600 rpm. The armature and shunt field resistance are 0.3 ohm and 220 ohms respectively. If the speed is to be increased to 800 rpm determine the percentage reduction of the field and additional resistance to be inserted in the field circuit. The torque develop at 800 rpm is 70 N-M.The armature resistance of a shunt motor fed from a 220 Volt DC source is 5 ohms and the resistance of the excitation winding is R ohm and it rotates stably. Then, a resistance of R ohm is added to the excitation circuit (a resistor with the same value as the winding resistance) to control the speed. How many RPM is the motor in the last state in steady state.Mechanical losses will be neglected, motor magnetically linear, no saturation, temperature change will be neglected.Armature current = Ia = 4 ALoad torque=Tload= 7 Nm
- The armature resistance of a shunt motor fed from a 220 Volt DC source is 5 ohms and the resistance of the excitation winding is R ohm and it rotates stably. Then, a resistance of R ohm is added to the excitation circuit (a resistor with the same value as the winding resistance) to control the speed. How many RPM is the motor in the last state in steady state.Mechanical losses will be neglected, motor magnetically linear, no saturation, temperature change will be neglected.Armature current = Ia = 3 ALoad torque=Tload= 8 Nma) 143 rpmb) 734 rpmc) 1361 rpm d) 77 rpm e) 1333 rpmExplain speed current and torque current characterstics of d.c. series motor.We need to derive an oil burner with single phase induction motor. Suggest the best type of single phase induction motor that can be suited for this purpose. Explain why you suggest this type of motor and also explain its working principle in detail with the help of cross field theory. Diagrams are necessary.
- We want a four-pole synchronous motor that operates at a speed of 1000 rpm. Determine the frequency of the ac source. List several other speeds that can be achieved by using synchronous motors operating from this ac source. What is the highest speed achievable?Name and briefly discuss the types of power loss in a shunt-connected dc motor.We need to derive an oil burner with single phase induction motor. Suggestthe best type of single phase induction motor that can be suited for this purpose.Explain why you suggest this type of motor and also explain its working principlein detail with the help of cross field theory. Diagrams are necessary.