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  3. (a) in dc motor, quadrant of operation can be de

(a) In DC motor, quadrant of operation can be defined by the armature voltage and current of the...

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Question

Electrical Engineering

(a)

In DC motor, quadrant of operation can be defined by thearmature voltage and
current of the motor. By using an appropriate diagram, brieflyexplain the
definition of all four quadrant of operation based on armaturevoltage and current.

(b)

A chopper is used to control speed of 45.36 kW, 1750 rpm, 240 V,189 A
permanent magnet DC motor with 0.01 Ω armature resistance. Thischopper-fed
DC motor is able to operate in both motoring and brakingmode of operations.
Given a chopper input voltage is 240 V and chopping frequency is400 Hz.
Assume that the system operates in continuous conduction mode.

(i)

Sketch the motor-drive circuit as mentioned above and labelclearly.

(ii)

Determine the chopper duty cycle during the motoring mode atrated
torque with 1000 rpm speed.

(8 marks)

(iii)

If the motor is operated in braking mode, what happened to thearmature
current, Ia? Determine the chopper duty during the braking mode atrated
torque with 400 rpm speed.

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