17) Micro-stepping: a) Reduces overshoot by smoothing the torque response of a motor. b) Is achieved by varying the voltage applied to the two phases of the motor to achieve intermediate positions c) Requires a motor with microscopic poles d) A and B e) A, B and C 18) By principle, what kind of motor the stepper motor is most similar to a) Squirrel-cage induction motor b) Synchronous motor c) Single-phase motor d) DC motor e) Wound rotor inductor motor 19) Which statement on stepper motors below is incorrect a) Half-stepping may generate changed torques on each step without controlling the motor terminal voltage or phase current b) Half-stepping doubles the resolution compared to full-stepping operation c) Stepper motor has permanent magnet rotor and wound stator poles d) Stepper motor must align the rotor poles to physical stator poles 20) A compact servo motor system installs which of the following components in one compact assembly a) A motor b) A potential encoder c) A controller d) A and B e) A, B, and C

17) Micro-stepping: a) Reduces overshoot by smoothing the torque response of a motor. b) Is achieved by varying the voltage applied to the two phases of the motor to achieve intermediate positions c) Requires a motor with microscopic poles d) A and B e) A, B and C 18) By principle, what kind of motor the stepper motor is most similar to a) Squirrel-cage induction motor b) Synchronous motor c) Single-phase motor d) DC motor e) Wound rotor inductor motor 19) Which statement on stepper motors below is incorrect a) Half-stepping may generate changed torques on each step without controlling the motor terminal voltage or phase current b) Half-stepping doubles the resolution compared to full-stepping operation c) Stepper motor has permanent magnet rotor and wound stator poles d) Stepper motor must align the rotor poles to physical stator poles 20) A compact servo motor system installs which of the following components in one compact assembly a) A motor b) A potential encoder c) A controller d) A and B e) A, B, and C

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Similar questions

Answer what you have learned.a. Define and give the construction of a synchronous motor.b. Discuss the working principle of a synchronous motor.c. Give the characteristic feature and the application of SM.
A 460 V, 60 Hz, 6 pole, 1180 rpm, Y-connected squirrel-cage induction motor has the following parameters per phase referred to the stator: Rs= 0.19 ohm, Rr' = 0.07 ohm, Xs = 0.75 ohm, Xr'= 0.67 ohm and Xm= 20 ohm. The motor is fed by a 6-step inverter, which in turn is fed by a 6-pulse fully-controlled rectifier. For the braking operation of the drive at a constant V/f ratio, calculate the speed for a braking torque of 350 N-m and the inverter frequency of 40 Hz. Options: 784 rpm 764 rpm 816 rpm 870 rpm
a 220v dc shunt motor takes 5a and 40a at no load and full load respectively it has an armature resistance of 0.2 ohm and field resistance of 110 ohm respectively. iron,friction and windages losses are negligible.then using among parameters find following. the ratio of emf at no load to full load
A 3-phase, 4-pole induction motor drives a conveyor which needs a constant torque over its entire operating speed range. The per-phase rotor resistance referred to the stator side is 0.74 2. The motor is fed from a 3-phase inverter-based adjustable speed drive, with a volt per hertz control scheme. When the fundamental component of the inverter line output voltage is 400 V (rms), 50 Hz, the motor operates at its rated speed of 1470 rpm. The electromagnetic torque produced by the motor can be approximated as: (a) Estimate the rated mechanical power output and air-gap flux of the motor. (b) It is proposed to reduce the power consumption of the drive by operating at half of the rated speed. Estimate the required fundamental line voltage and frequency of the inverter (c) Assess the effect of the stator winding parameters on the air-gap flux found in Part(a)
A 400V, 50Hz, 6-pole 3-phase asynchronous motor rotates 20Nm of constant load torque at 950rpm. If it is desired to rotate this load at 750 rpm mechanical speed;a) The synchronous speed of the motor,b) Supply frequency,c) Find the value of the supply voltage between phases?Note: The motor will be driven with V/F sbt because the load torque does not change.
a 220v dc shunt motor takes 5a and 40a at no load and full load respectively it has an armature resistance of 0.2 ohm and field resistance of 110 ohm respectively. iron,friction and windages losses are negligible.then using among parameters find following. calculate emf at full load of dc motor
A star-connected squirrel cage induction motor has the following parameters and rating: Rs = 2 ohm, Rr¹ = 3 ohm, Xs = Xr' = 3.5 ohm, V = 400V, 50 Hz, 1,380 rpm. It is driven by voltage source inverter which gives constant V/f control to induction motor. If the inverter frequency is variable from 10% of the rated frequency to base frequency. Calculate: (a) Frequency for a speed of 1,000 rpm and full-load torque. (b) Torque for a frequency of 35 Hz and speed of 950 rpm.
(b) According to the Figures 1.2 and 1.3, it is assumed that the motors are run by 800-Hz and 1700-HZ power output from an inverter for OMM and Teco motors respectively. It is worth noting that with full-load speed (N) for both motors rotating at 47,888 rpm, answer the following questions (i) Determine synchronous speed (Ns), calculate the slip rate and compare them. (ii) Explain the efficiency of these two motors based on the power and the calculated slip rate.
Draw and explain with the help of neat circuit diagram, how will you achieve, dynamic braking of 3-phase squirrel cage induction motor.
The parameters of a three-phase, 50 Hz, 6-pole, 400 V star connected induction motor are r1 = 0.3 ohm, x1 = 0.5 ohm, r’2 = 0.15 ohm and x’2 = 0.2 ohm. The voltage and frequency of the induction motor is controlled by a power electronic converter (inverter). Calculate the required inverter output frequency and voltage to drive the induction motor load at 0.2 the rated speed of the motor and calculate the current drawn by the motor for that case. The formula for the maximum slip is given below:
(b) A three phase, 5-hp, 60Hz, 115V, 4-pole induction motor is operating at rated voltage, rated frequency, and 125 percent rated load has an efficiency of 85.4 percent. The stator conductor loss, rotor copper loss and core loss are 223.2W, 153W, and 114.8W respectively. Sketch the power flow diagram, enter the given data, and determine i) shaft speed ii) shaft torque
An induction motor OF 30 HP, 220 V, 450% of the rated current with therated voltage and delivers during the starting period,with 130 % of the normaltorque. The full load efficiency and full load power factor of the motoris 80 and 70 percent, respectively. If an autotransformer is used as astarting unit and the starting torque of the load is only 50 % of therated torque of the motor, Determine the starting voltage and the startingcurrent of the line