Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 54, Problem 5SQ
To determine
Explain about a slave motor.
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the relation between armature and
field currents in a series connected
DC motor is
O It = If + la
O It=la - If
O If = la
At rated load, a shunt motor draws an armature current of 100 A from a 240 V source while running at 1000 rpm producing a back emf of 228 V. At no load, the armature current drops to 5 A that produces a back emf of 235 V. How fast does the motor run at no load?
what are the main advantages of gear motors
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Electric Motor Control
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- 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_forwardA 120 V shunt motor has an armature equivalent of 0.5 ohm and a field resistance of 60 ohm. At full load, the motor takes 10 A and the speed is 1000 rpm. At what speed must this motor maybe driven as a generator to deliver 10 A to an external load at 120 V?arrow_forwardQ7/ What are the advantages and disadvantages of the permanent magnets dc motors?arrow_forward
- Why dc motors change its direction of rotation as the sign of input voltage to it gets changed?(Can you explain it to me using the concept of Fleming's left hand rule?)arrow_forwardA 220V d.c shunt motor is having armature current of 10 A and torque of 10 N-m.Find the torque when armature current is doubled a. 5 N-m b. 10 N-m c. 40 N-m d. 20 N-marrow_forwardWhich of the following is preferred to counter the effect of armature reaction in DC machine? O Use of main pole OUse of interpoles Use of series winding O Shifting of brushesarrow_forward
- What are Gross Motors? Explain the examples of it.arrow_forwardAs shown in the figure below, this is a speed regulation method for DC separately excited motor. a) What is the speed regulation method? b) What are the characteristics for this speed regulation method? no ne 11₂ 2 11₂ I I D E Ra R₂ Rs 1 3arrow_forwardQ4/B/ What are the principal characteristics of a series DC motor? What are its uses? Core Mcarrow_forward
- A permanent magnet dc motor has the following specifications Maximum speed = 500 rad/sec Maximum armature current = 2.0 A constant (K) = 0.06 V-s/rad Torque constant (Kb) = 0.06 N-m/A Frictional torque = 0.012 N-m Armature resistance = 1.2 ohms Armature inductance = 0.020 H Armature inertia = 6.2x10-4 N-m-s 2 /rad Armature viscous friction = 1x10-4 N-m-s/rad a) Determine the voltage/velocity and voltage/position transfer functions for this motor b) Determine the voltage/velocity and voltage/position transfer functions for the motor neglecting the electrical time constantarrow_forwardA shunt dc motor has armature voltage = 150 V, armature field resistance = 100 2, and armature resistance = 1.6 Q. At a certain torque the motor rotates at 1350 R.P.M and takes a current = 12 A. what will be the load torque?arrow_forwardA 100-V series motor is used to drive a load through a pulley. This machine has anarmature resistance of 0.2 ohm and a series-field resistance of 0.25 ohm. When atorque of 25 N-m is applied to the pulley, the speed is 600 rpm. If SPL at this load is300 W, calculate the armature current.arrow_forward
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