Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 25, Problem 10SQ
To determine
List the three factors that determine the amount of torque produced by a squirrel cage motor.
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Chapter 25 Solutions
Electric Motor Control
Ch. 25 - Prob. 1SQCh. 25 - When can full-voltage starting be used?Ch. 25 - Name the simplest, most rugged, and most reliable...Ch. 25 - Define the term slip.Ch. 25 - When the voltage is reduced to start a motor, what...Ch. 25 - Why is it more advisable to start some machines at...Ch. 25 - Prob. 7SQCh. 25 - Prob. 8SQCh. 25 - Prob. 9SQCh. 25 - Prob. 10SQ
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- QUESTION 19 The torque of a DC motor is at its minimum strength when the motor's armature loop is at the neutral plane O inside of the main fieldarrow_forwardQuestion 3/ A 220-volt d.c. shunt motor is running at a speed of 800 r.p.m. and draws 100 A. If the motor developing half the torque. Choose the correct answer. Take armature resistance is 0.1 ohm, and shunt field resistance is 110 ohm. Assume that the magnetic circuit is saturated. For this motor choose the correct answerarrow_forwardWhen the armature current of a 220 Volt DC shunt motor is 40 Amperes, when the magnetic flux suddenly decreases by 10%, armature current increases to 80 Amper, which is the armature winding resistance of the motor?arrow_forward
- 2 (B)- Indicate whether the following statements are true or false and correct the false statements I-A d.c. shunt motor is running with certain load. The effect of adding an external resistance in armature circuit is to increase the motor speed F Constant speed 2- A de series motor develops a torque of 30 N.m at 4 A of load current. if the current is increased to 6 A, the torque developed will be 67.5 N.m T 3-If the two field Windings are wound in such a manner that the fluxes produced by the two always help each other, the motor is called cumulatively compound F 4-The speed of d.c series motor is decreased if the armature current is increased T 5- To solve the Commutation Problem in large machines, this can be achieved by increasing the brush width. Tax In (Rm. Ps)arrow_forwardQ7/ What are the advantages and disadvantages of the permanent magnets dc motors?arrow_forwardCalculate the torque in lb-ft developed by a DC motor given the following parameters: Pole = 8, Conductors = 750, Flux per Pole = 1.70*106 Maxwells, Armature current = 50-A, Wave winding. What will be the horse power of the motor when operating at a speed of 1,850 rpm?arrow_forward
- 5. A stepper motor is being used as a crane motor in an expensive toy. The motor has the following properties: Holding torque = 2.52 kg -cm dynamic torque = 1.440 kg-cm detent torque = 0.360 kg-cm The motor turns a 3.81 cm diameter pulley around which a string is wound. How much weight can the crane lift? How much weight can the crane continue to support with the power on; with the power off?arrow_forwardWhat is the name of the speed control by varying the flux of the DC motor? a. Flux control method b. Voltage control method c. None of the above d. Armature control methodarrow_forwardWhat are some ways to test the strength of a vibration motor?arrow_forward
- A full load current of 50 A is generated by a 250 V d.c. shunt motor with a 0.5 ohm armature resistance. When a 1 ohm resistance is connected in series with the armature, what is the ratio of stalling torque to full load torque?arrow_forwardWhen the armature current of a 220V DC shunt motor is 40Amper, the armature current of the motor increases to 80A when the magnetic flux suddenly drops by 10%. Which of the following is the armature winding resistance of the motor?arrow_forwardA 250 V shunt motor, having an armature resistance of 0.2 ohm draws fromthe mains a current of 50 A on half full load. The speed is to beincreased to twice half full load speed. If the torque of the motor is ofconstant magnitude, determine the percentage change in flux required.[Ans. 52.29 %]arrow_forward
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