Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 53, Problem 3SQ
To determine
Write the maximum speed rpm of gear motors.
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Electric Motor Control
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- How can the holding torque of a stepping motor be increased?arrow_forwardwhat are the main advantages of gear motorsarrow_forwardA 240 V shunt motor has an armature current of 15 A when running at 800 rpm against full-load torque. The armature resistance is 0.6 ohm. What resistance must be inserted in series with the armature to reduce the speed to 400 rpm at the same torque? What will be the speed if the load torque is halved with this resistance in the circuit? Assume the flux to remain constant throughout.arrow_forward
- What are the effects of slip in the slip-ring induction motor? A. No effects B. Changes the change in speed C. Changes the rotor frequency D. B and Carrow_forwardExplain speed current and torque current characterstics of d.c. series motor.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_forwardExplain why synchronous motor doesn’t have any self-starting torque. Demonstrate some measures to make it self-starting. Please dont copyarrow_forwardIn series motor, the armature torque is directly proportional to the armature current" True Falsearrow_forward
- A shunt motor is taking 240 A at 100 V. The armature resistance is 0.015 ohm and shunt field resistance is 50 ohm. What is the field current, armature current and the back emf?arrow_forwardwhat is slip ring induction motor ?arrow_forwardA 500-Volt shunt motor running at 720 rpm takes an armature current of 50A. The effective armature resistance is 0.4 ohms. What resistance must be placed in series with the armature to reduce the speed to 600 rpm? The torque remains constant.arrow_forward
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