Rotor of the electrical machine, having 8 poles, is turned on 360 electrical degrees. How much is that in mechanical degrees?
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- Lap windings are used in d.c machine designed for what type of application? * O Low voltage low torque d-c motor O High voltage high torque d-c motor Low voltage high current d-c generator High voltage low current d-c generatorWhy do motors have gaps or breaks throughout the rotor and commutator? It makes the motor cheaper since not as much material is needed. Only some sections of the rotor will act as electromagnets, causing the rotor to always be pushed in the same direction. It allows some of the magnetic field to escape so that rotor doesn't get too stressed. It lets air into the motor to keep it cool since the electricity can make it hot. It happens when rotors don't use enough oil, so they crack.The electromotive force created by a direct current generator is proportional to Flux/pole Speed of armature Number of poles All of the aBove
- The voltage induced in 8 poles lamp wound generator is 120 V with armature resistance = 0.3 2. What will be the terminal voltage at a load = 3.6 A when the machine is rewound as a wave?An 8-pole DC machine has a simplex wave-wound armature containing 200 coils of 10 turns each. The resistance of each turn is 0.01 Ω. The flux per pole is 0.004 Wb. what is the internal resistance of the armature in ohms?The simplex armature of a six-pole generator carries a total current of 350 amperes. What current flows in each path if the winding is (a) lap? (b) wave? (Our subject is Electrical Machines 1, the lesson is DC Generators)
- In a 4 pole lap wound DC Machine has 720 conductors, the number of parallel paths is4. A 4-pole, lap-wound armature has 144 slots with two coil sides per slot, each coil having two turns. If the flux per pole is 20 mWb and the armature rotates at 700 rpm, what is the induced voltage?2. Give two ways you can reverse the direction of a basic dc motor? O a) Reverse the current O b) Keep the current the same O c) Reverse the magnetic field O d) Keep the magnetic field the same