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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- The relation between armature torque and armature current of a DC motor is Parabolic Linear Inverse O ExponentialFor a particular application, a 4-phase stepper motor must be capable of stepping in 22.5° increments. How many poles must it have? What is the rotational speed in RPM, when the control unit of the motor supplies 200 pulses per second ? Select one: O a. P = 4 poles, and nm = 750 RPM O b. P = 6 poles, and nm = 666 RPM O c. None O d. P = 8 poles, and nm = 520 RPM Clear my choiceA dc shunt motor runs at 900 rpm from a 400V supply when taking an armature current of 25A. Calculate the speed at which it will run from a 230V supply when taking an armature current of 15A. The resistance of the armature circuit is 0.75ohm. Assume the flux per pole at 240V to have decreased to 75% of its value at 400V
- A 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 220V DC shunt motor draws a no load armature current of 2.5A when running at 1400 rpm. Determine its speed when taking an armature current of 60A, if armature reaction weakens the flux by 3%.A d.c. shunt motor is running with certain load. For constant torque, the effect of adding an external resistance in series with armature circuit is to reduce the motor speed increase the motor speed reduce the armature current of the motor reduce the field current of the motor If dc generator of a simple two layers progressive wave winding has 21 number of slot and four poles, what is the front pitch in term of slot * 11 4 O 1
- 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 should be operated in a strong field which is due to the What happens to if suddenly goes a) nothing, it continues rotating b) it over speeds c) it stops rotating current if moter if rotating to zero. as beforeA 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 200 V dc motor takes 50 A in series and is operating at a speed of 1000 rpm when full of electrical components (load). Its resistance is 0.2 Q. What value of series resistance will offer a rated torque at 800 rpm?A dc shunt motor runs at 900 rpm from a 460 V supply when taking an armature current of 25 A. Calculate the speed of which it will run from a 230 V supply when taking an armature current of 15 A. The resistance of the armature circuit is 0.8 ohm. Assume flux per pole at 230 V have to decrease to 75% of its value at 460 V
