8 poles DC Series motor

Oct 24th, 2015
RockCafe
Category:
Engineering
Price: $15 USD

Question description

A 550 V, 8 pole dc Series motor has the following name plate details: 

RATING 150 kW 

VOLTAGE 550 V dc 

POLES

CURRENT 305 A 

SPEED 450 rev/min 

CONNECTION SERIES 

The motor parameters are: 

Armature Resistance RA = 0.07 Ω 

Armature Conductors 1112

Armature Winding Type: Lap 

Series Field Resistance RS = 0.04 Ω 

The series dc motor above is supplied from a 550 V source via a step down DC/DC chopper converter which has a switching period of 5 ms. 

Given that the armature voltage constant for the motor is K = 0.03593 V/A-rad/s. 

(i) Draw a diagram of the system showing converter and dc motor. [5 Marks] 

Determine: 

(ii) The average DC voltage applied to the motor if the switch ON time of the converter is 3.5 ms. [7 Marks] 

(iii) The internal generated voltage (back emf) of the motor if it draws a constant current of 250 A from the supply. [7 Marks] 

(iv) The operating speed of the motor in rev/min when drawing 250 A.[13 Marks] 

(v) The induced (developed) torque in Newton metres of the motor. [11 Marks] 

(vi) The useful flux per pole in milli webers (mWb) of the motor for input current of 250 A. [7 Marks] 

Assume linear magnetic characteristics for the dc motor

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