Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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- ⦁ Explain why single phase Induction motor is NOT self-starting?arrow_forwardExplain why a resistor is needed in series with the armature when starting a DC motor, but is not needed when the motor is operating at its steady - state speed.arrow_forward2- A simple wave wound de shunt motor has the following data: Armature resistance =0.1 ohm Shunt field resistance = 100 ohm Number of poles = 2 Number of conductors = 400 Mechanical and core loss at full load = 2000 W. When the motor is connected to a 400 Volt supply and is fully loaded it draws 104 A. Calculate at a speed of 3000 rpm: i) Armature current and E.M.F ii) Flux per pole iii) Copper losses within the machine. iv) Developed torque, shaft torque and efficiency. v) Sketch the power flow diagram at full load. vi) Motor speed if an external resistance of 0.4 ohms is added to the armature circuit while the load torque remains constant.arrow_forward
- A 220 V shunt motor driving its normal load draws an armature current of 50 A from a 220 V dc source. The armature resistance of this motor including brushes is 0.25 ohms. How much armature current (minimum) Will this motor draw from a 200 V DC source when driving the same load with the field adjusted to maintain the same speed.arrow_forwardWhat type of speed control method provides above the normal speed of the DC series motor? O a. Armature control method O b. Armature resistance control O c. Field diverter O d. Flux control methodarrow_forwardb) Draw the speed control block diagram of the DC motor, which can be controlled with armature voltage and field flux with 3 phase AC-DC driver, and explain how the speed control is done.arrow_forward
- A 4 pole, 500V shunt motor has 720 wave connected conductors on its armature. The full load armature current is 60A and flux per pole is 0.03Wb. The armature resistance is 0.2Ω and contact drop per brush is 1V. What is the back emf? What is the developed torque?arrow_forwardwhat is slip ring induction motor ?arrow_forwardWhat are the effects of slip in the slip-ring induction motor? A. No effects B. Changes the change in speed C. Changes the rotor frequency D. B and Carrow_forward
- Does a DC motor have to be turning in order for it to develop torque? a) yes b) no Most DC motor consist of many turns per armature loop as well as many evenly distributed loops per al mature. a) true b) false Brushes a DC motor. a) are part of the electrical circuit in b) provide a sliding electrical contact to the commutator of c) are made of a material which is softer than the commutator segments of d) all of the abovearrow_forwardA 240 V shunt motor has an armature current of 15 A when running at 800 rpm against full-load torque. The armature resistance is 0.6 ohm. What resistance must be inserted in series with the armature to reduce the speed to 400 rpm at the same torque? What will be the speed if the load torque is halved with this resistance in the circuit? Assume the flux to remain constant throughout.arrow_forwardWhat effect does varying the DC incitation have on the stator currents of asynchronous motor? How can you increase the power output of a synchronous motor? What is electrodynamometer? Where is the power (heat) dissipated in the electrodynamometer?arrow_forward
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