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?2. A 2-pole, 50 Hz induction motor supplies 15 kW to a load at a speed of 2950 rpm. a. What is the motor's slip? b. What is the induced torque in the motor in N-m under these conditions? c. What will be the operating speed of the motor be if its torque is doubled? d. How much power will be supplied by the motor when the torque is doubled?
- A DC motor runs at 1725 rpm at full load and 1775 rpm at no load. The speed regulation is ?For a particular application, a 6-phase stepper motor must be capable of stepping in 10° increments. How many poles must it have? What is the rotational speed in RPM, when the control unit of the motor supplies 120 pulses per second ? Select one: O a. P = 8 poles, and nm = 320 RPM O b. P = 6 poles, and nm = 200 RPM O c. P = 6 poles, and nm = 220 RPM O d. NoneA 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.
- A 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 stepA 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?
