Compare between servo motor and universal motor
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- Explain the principles of servomotors and discuss their different types. Support your answer using a figure/diagramIf field current is not supplied internally by the armature, then the machine is said to be generator. O Shunt O Self excited O Compound O separately excitedthe relation between armature and field currents in a series connected DC motor is O It = If + la O It=la - If O If = la
- In DC Shunt Motor the back emf E. = Select one: O a. V-IR O b. V/I.R₂ O C. V+ I₂R₂ O d. VI /R₂Which of the following is preferred to counter the effect of armature reaction in DC machine? O Use of main pole OUse of interpoles Use of series winding O Shifting of brushesElectric motors works on the principle of O a. Couple O b. Torque c. Capacitor O d. Friction
- Problem 3: Design a PWM to control a servo motor based on the data given in Table 2 Angle -60 0 +60 Right Left Center 1.5 msec PWM 1 msec 2 msec Table 2A dc shunt motor develops 7.8 HP at 120 V, the armature efficiency is 93 %. What is the armature effective resistance?Which of the following is preferred to counter the effect of armature reaction in DC machine? Use of main pole Use of interpoles Use of series winding Shifting of brushes
- A permanent magnet dc motor has the following specifications Maximum speed = 500 rad/sec Maximum armature current = 2.0 A constant (K) = 0.06 V-s/rad Torque constant (Kb) = 0.06 N-m/A Frictional torque = 0.012 N-m Armature resistance = 1.2 ohms Armature inductance = 0.020 H Armature inertia = 6.2x10-4 N-m-s 2 /rad Armature viscous friction = 1x10-4 N-m-s/rad a) Determine the voltage/velocity and voltage/position transfer functions for this motor b) Determine the voltage/velocity and voltage/position transfer functions for the motor neglecting the electrical time constantThe counter e.m.f. of a d.c. motor often exceeds the supply voltage aids the applied voltage helps in energy conversion regulates its armature voltage In a d.c. motor, the mechanical output power actually comes from field system air-gap flux back e.m.f. electrical input power?In DC machine torque depends on which of the following None of the above O armature current (la) O flux (4) flux (p) and armature current (la)