Suppose a stepper motor with a 45-degree step angle has 21 pulses applied to it per second. What is its rotating speed in rpms?
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Suppose a stepper motor with a 45-degree step angle has 21 pulses applied to it per second. What is its rotating speed in rpms?
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- 7 Multiple Choice 10 points The shaft torque of a dc motor is less than its armature torque because of Copper losses Mechanical losses Back emf Rotational lossesA 15 HP 220 V shunt motor has an armature resistance of 0.07 ohm and shunt a shunt resistance of 200 ohms. The overall efficiency at rated output is 89 %, What is the rotational loss?A DC motor runs at 1725 rpm at full load and 1775 rpm at no load. The speed regulation is ?
- A certain dc motor produces a back emf of EA=240 V at a speed of 1200 rpm. Assume that the field current remains constant. Find the back emf for a speed of 600 rpm and for a speed of 1500 rpm.Draw the circuit please.A 220-V dc shunt motor runs at 500 rpm, when the armature current is 50 A. Calculate the speed if the torque is doubled. Given that Ra = 0.2 ohm. Express in rps.
- Q4/B/ What are the principal characteristics of a series DC motor? What are its uses? Core McA shunt motor has an armature resistance of 0.20 ohm. The armature takes a current of 120A from a 440V source and running at 800 rpm. If the total torque developed is unchanged, determine the speed if the magnetic field is reduced to 60% of the initial value.step by step
- A 20-hp, 110 V DC shunt motor has an efficiency of 88% and the exciting current of 4 amperes and an armature resistance of 0.04 ohm. What starting resistance is required for full-load torque?A 120 V shunt motor has an armature equivalent of 0.5 ohm and a field resistance of 60 ohm. At full load, the motor takes 10 A and the speed is 1000 rpm. At what speed must this motor maybe driven as a generator to deliver 10 A to an external load at 120 V?At full load, when the DC shunt motor is supplied by 110 V dc source, the armature current is 20 A keeping the speed of the motor at 500 rpm. If the flux of the motor is weakened by 10%, the armature current drops to 15 A. By how much is the torque decreased?
