Explain briefly in one(1) sentence what is the function of the squirrel cage winding in the operation of the synchronous motor.
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1. Explain briefly in one(1) sentence what is the function of the squirrel cage winding in
the operation of the synchronous motor.
(for 50 points)
Step by step
Solved in 2 steps
- Explain briefly in one(1) sentence what is the function of the squirrel cage winding in the operation of the synchronous motor.(B)- Indicate whether the following statements are true or false and correct the false statements 1- Wave wound armature has two parallel paths. 2- The current ratio is equal to 1/ turn ratio at no-load while the voltage ratio is equal to 1/ turn ratio at full load 5.4. 3-When a series de motor is operated without a load, the armature draws excessive current Ph 4- The hysteresis loss can be minimized by using core of thin laminations ل لهول 259 Ne 021. A three phase, 10 pole, 60 cycle IM has a full load slip of 0.075. What is the speed of: a. the rotor relative to the revolving field? ( 54 RPM) b. the revolving field relative to the stator? ( 720 rpm)
- Q3/ Chose the correct answer for the following 1. Synchronous motors are generally not self-starting because (a) the direction of rotation is not fixed (b) the direction of instantaneous torque reverses after half cycle (c) startes cannot be used on these machines (d) starting winding is not provided on the machines 2. The power developed by a synchronous motor will be maximum when the load angle is (a) Zero (b) 45° (c) 90° (d) 120° 3. An over-excited synchronous motor takes (a) leading current (b) lagging current (c) both (a) and (b) (d) none of the above 4. In a synchronous motor, the magnitude of stator back e.m.f. £& depends on (a) d.c. excitation only (b) speed of the motor (c) load on the motor (d) both the speed and rotor flux 5. A pony motor is basically a (a) small induction motor (c) D.C. shunt motor (b) D.C. series motor (d) double winding A.C./D.C. motorQuestion 9 The combined losses occuring in armature and field circuit of a DC motor is known as the rotational losses True O False Moving to another question will save this response. 梦 $ a hp B1- What is the starting torque developed by a split-phase or a capacitor start motor? 2- What is the current in-rush at the time of starting the motor? Does it cause severe fluctuations on the line?
- c) Based on Figure 3 (c), a basic DOL starter induction motor at a power station is experiencing run-time error and unable to start, based on your understanding, interpret the sequence of troubleshooting shall be carried out to identify the root cause of the abnormalities. 3P 1P MCB MCB STOP K1 START MOTOR Figure 3 (c)Question 1 [Soalan 1] (a) The model for a position control system using a DC motor is shown in Figure 1.1. Calculate the value of K₁ and K₂ so that the response peak time is 0.2 second and the overshoot for a unit step input is less than 4%. [Satu model untuk satu sistem kawalan kedudukan yang menggunakan motor DC ditunjukkan didalam Rajah 1.1. Kirakan nilai K, dan K₂ supaya sambutan masa puncak ialah 0.2 saat dan terlajak untuk input unit langkah adalah kurang daripada 4%.] R(s) K₁ s(s+1) 1+ K₂s Figure 1.1 [Rajah 1.1] Y(s)In a synchronous motor, a decrease in the torque angle a results in: O A. No change in the induced torque O B. Increasing the induced totque; motor will speed up O C. Decreasing the load on the synchronous motor O D. None of the other choices are correct O E. Decreasing the induced torque; motor will slow down
- Q2 ) I. What is the effect of chang ing the sequence of phases in the electric feeder (single phase, three-phase) motor? How do you correct the defect if necessary?L1. It common practice to provide access to the interpole windings on machines designed to be used as motors or generators. a) is b) is not c) neither "a" nor "b" L2. The direction of rotation of a DC motor is referenced from the commutator end of the motor. a) true b) false L3. How may the direction of rotation of a DC motor be reversed? a) by reversing the direction of current flow in the armature conductors b) by reversing the polarity of the magnetic field poles c) either "a" or "b" d) neither "a" nor "b"Explain a synchronous motor. How is speed controlled? How is movement started