Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 22, Problem 5SQ
To determine
Redraw Figure 22-3 for the tripped out condition of motor M2 and M3 due to overload.
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Question 9
What factors affect the torque of a dc motor?
(Select all that applies)
A) Number of armature conductors
B) Type of armature winding
C) Armature current
D) Field current
E) Speed of the motor
F
Number of poles
write true or false in the following sentences:
1. Load torques which always oppose the motion and change their sign on the reversal of motion are
called passive load torques.
2. The control rectifier drive has low atmature current ripple compare to de to de chopper drives.
3. The main difference between dynamic breaking and regenerative braking of de motor is the
disconnection the source from de motor in dynamic braking.
4. Two quadrant operation of de motor can be obtained from thee phase semiconverter.
5. de-de four-quadrant drives can be supply high power than ac-de four-quadrant drives.
2
Helting. Avoid interruption and keep your files safe with genuine Office today.
b.
3
5
A 30 hp, three-phase, wye connected, 60 Hz, 360 VLL, synchronous motor is operating at 50% full load,
rated voltage and 0.8 pf leading (over-excited). The motor has negligible armature resistance and a
synchronous reactance of 2.5 02/phase. Stator core loss is 1kW and friction and windage loss is 1.5 kW.
a. Calculate the new value of line-to-neutral excitation voltage and load angle when the field
current is adjusted for 0.85 pf lagging with the same 15 hp load.
Determine the load angle, current (with angle), and the reactive power exported (positive) or
imported (negative), when the motor load is 30 hp and the line-to-neutral excitation voltage is
255V.
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7
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- Electrical engineering subject of electrical machines/ I need a correct and accurate solutionarrow_forwardQ3/ 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. motorarrow_forward#20,#21arrow_forward
- A 6 pole, 250V series motor is wave connected. There are 240 slots and cach slot has 4 condoctors. The flex per pole in 1.75 x 10 wb when the motor is taking 80A. the field resistance is 0.0562, the armature resistance is 0.10 and the in and frictional loss is 0.1KW. Calculate a) The speed b) The power c) The shaft torque (marks)arrow_forward1) DRAW A SCHEMATIC DIAGRAM FOR AUTOMATIC FORWARD & REVERSE MOTOR CONTROL USING LIMIT SWITCH, RELAY AND TEMPERATURE SENSOR. (Use temperature sensor to signal the transition of motion). Y DRAVEMA MNDENTAL ww CHEMINEMAT CAN SCHENG De trüarrow_forwardchoose a right answerarrow_forward
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