Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 29, Problem 2SQ
What is the principal reason for using star-delta motors?
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- Explain speed current and torque current characterstics of d.c. series motor.arrow_forward"Explain why speed of a DC motor get affected on load, if its series field winding is connected reverse with respect to its shunt field winding ? "arrow_forwardP-1).. Which of the following determine the amount of torque produced by a single-phase split-phase motor? a) The strength of the magnetic field of the stator b) The strength of the magnetic field of the rotor c) The phase angle difference between the current in the start winding and the current in the run winding d) all of the above P-2). The phase angle difference between the currents in the start winding and run winding of a single-phase split-phase motor is typically 90 degrees. a) true b) false P-3). A centrifugal switch is used to disconnect the________ winding of a non-hermetically sealed single-phase split-phase motor at approximately 75% of rated speed. a) run b) start c) either "a" or "b" d) neither "a" nor "b" P-4). Where an internal centrifugal switch cannot be used, an external______ relay can be used to perform the same function in a single-phase split-phase motor. a) hot-wire b) current c) solid-state starting d) all of the abovearrow_forward
- Justify with suitable diagrams why reluctance motor is termed as variabletorque motor and hysteresis motor as constant torque motor.arrow_forwardWhy is the AC series motor often referred to as a universal motor?arrow_forwardWhat characteristic of wound rotor motors led to their wide use for industrial applications?arrow_forward
- the BLDC motors have the advantage of High Efficiency Compactness Low Maintenance All of the answers When the speed of the DC motor is Increases its Armature current Remain Constant Decreases Increases Any of the answers A variable reluctance stepper motor is constructed of .. . material with salient poles. ferromagnetic paramagnetic non-magnetic diamagneticarrow_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_forward1. Write the comparison between DC shunt motor and DC Shunt generator. 2. Write a short note on necessity of starter in de motor. 3. What is the principle of Induction motor?arrow_forward
- Explain the different losses involved with DC shunt motors.arrow_forwardCan you solve the question step by step clearly ?arrow_forwardA d.c shunt motor with r_{a} = 0.8Omega has 200 W field circuit loss and 250 W rotational loss. Motor will operate maximum efficiency when loaded to carry an armature current of aboutarrow_forward
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