Computer Aided Drafting (CAD) Lab Manual

EXPERIMENT NO : 1

CROSS LINKED POLYETHYLENE CABLE

AIM:

         Draw the cross sectional elevation of XLPE Cable using Auto cad software.

PROCEDURE:

         The following general commands are used to draw the cross sectional view of XLPE cable in Auto cad.

Step 1: Set the limits of the drawing screen.

Step 2: PUT ORTHOON where ever necessary.

Step 3: Using OSNAP function.

Step 4: Draw circles of given dimension using circle command.

Step 5: Use polar Array.

Step 6: Use Donut Command.

Step 7: Use batch and copy Command.

Step 8: Use Text Command and mark the parts of the figure.

Step 9: Command: – q Save.

RESULT:

             The cross-section of XLPE Cables is drawn by using AutoCAD software.

CROSS LINKED POLYETHYLENE CABLE

EXPERIMENT :2 

PIN INSULATOR

AIM:

         Design and draw the half sectional elevation of pin insulator using Auto cad software.

PROCEDURE:

         The following general commands are used to draw the half sectional elevation of pin insulator diagram using Auto cad.

Step 1: Set the limits of the drawing screen.

Step 2: Put ORTHO ON where as necessasary .

Step 3: Using OSNAP function.

Step 4: Draw conductors of appropriate dimension using LINE Command

Step 5: Draw circle of appropriate dimension using circle command.

Step 6: Draw arc using arc command.

Step 7: Use mirror command.

Step 8: Use Hatch command.

Step 9: Use trim command.

Step 10: Use copy command.

Step 11: command: q Save.

RESULT:

               The half sectional elevation of pin insulator is drawn by using AutoCAD software.

PIN INSULATOR

EXPERIMENT :3 

DC LAP WINDING

AIM:

         Design and draw a developed DC lap winding diagram for a DC Machine having 6 poles, 36 armature conductors for a single turn coil using Auto cad software.

PROCEDURE:

         The following general commands are used to draw the developed DC lap winding diagram using Auto cad.

Step 1: Set the limits of the drawing screen.

Step 2: PUT ORTHOON where ever necessary.

Step 3: Using OSNAP function.

Step 4: Draw conductors of appropriate dimension using LINE Command

Step 5: Use rectangular Array Command for making rows and columns of conductors

Step 6: Use p-line command for making arrows.

Step 7: Use Rectangular command for making poles.

Step 8: Make the numbers on the conductors using TEXT Command.

Step 9: Use Copy, Hatch, Donut, Arc Commands.

Step 10: Command: – q Save.

RESULT:

                  The DC Lap winding is drawn by using AutoCAD software.

DC LAP WINDING

EXPERIMENT :4 

DC  WAVE  WINDING

AIM:

         Design and draw a developed DC simple wave winding diagram for a DC Machine having 4 poles, 34 armature conductors using Auto cad software.

PROCEDURE:

         The following general commands are used to draw the developed DC lap winding diagram using Auto cad.

Step 1: Set the limits of the drawing screen.

Step 2: PUT ORTHOON where ever necessary.

Step 3: Using OSNAP function.

Step 4: Draw conductors of appropriate dimension using LINE Command

Step 5: Use rectangular Array Command for making rows and columns of conductors

Step 6: Use p-line command for making arrows.

Step 7: Use Rectangular command for making poles.

Step 8: Make the numbers on the conductors using TEXT Command.

Step 9: Use Copy, Hatch, Donut, Arc Commands.

Step 10: Command: – q Save.

RESULT:

                  The DC wave winding is drawn by using AutoCAD software.

Solution:

yb  and yf  can be calculated by using the following formulae.

                   ( yb + yf ) / 2 = ( Z ± 2)/P

                  ( yb + yf ) / 2= (34+2)/4  (for progressive winding)

                  yb = 9    yf = 9

EXPERIMENT :5

UN-BIFURCATED THREE PHASE CONCENTRIC WINDING

AIM:

         To draw concentric un- bifurbcated winding diagram with two planes over hang, for a three phase, 48 slots, 8 poles AC armature.

PROCEDURE:

Step 1: Set the limits of the drawing screen.

Step 2: Put ORTHO ON where as necessasary.

Step 3: Using OSNAP function.

Step 4: Draw conductors of appropriate dimension using LINE Command

Step 5: Use rectangular array command for making rows and columns of conductor.

Step 6: Use pline command for making arrows.

Step 7: Make the numbers on the conductors using TEXT command.

Step 8: Use DONOT Command wherever need.

Step 9: Use copy, layer commands.

Step 10: Commands: q save.

RESULT:

         Concentric winding un- bifurcated diagram with two plane over hang, for a three phase, 48 slots, 8 poles AC armature is drawn by using AutoCAD software.

Solution:

Slots/pole/phase = 48/(8 x 3)  =  2

Thus one pole phase group consists of two slots.

Coil span = pole pitch = slots per pole = 48/8 =6

Angle between consecutive slots = 180o /6 =30o electrical

EXPERIMENT :6

AC MUSH WINDING

AIM:

         Draw a Mush winding diagram for a 4 poles, 36 slots 3 phase armature using Auto cad software.

PROCEDURE:

         The following general commands are used to draw the developed AC Mush   winding diagram using Auto cad software.

Step 1: Set the limits of the drawing screen.

Step 2: Put ORTHO ON where as necessary.

Step 3: Using OSNAP function.

Step 4: Draw conductors of appropriate dimension using LINE Command

Step 5: Use rectangular Array Command for making rows and columns of conductors

Step 6: Use p-line command for making arrows.

Step 7: Make the numbers on the conductors using TEXT Command.

Step 8: Use Copy, layer Commands.

Step 9: Command: – q Save.

RESULT:

                The developed AC mush winding diagram for 4 pole 36 slots 3 phase armature is drawn by using AutoCAD software.

AC MUSH WINDING

EXPERIMENT :7

AC LAP WINDING

         Design and draw a developed winding diagram of a double layer Lap winding for a three phase, 6 poles, 18 slots machine. Assume that the winding is full pitched.

PROCEDURE:

         The following general commands are used to draw the developed AC lap winding diagram using Auto cad.

Step 1: Set the limits of the drawing screen.

Step 2: PUT ORTHO ON where ever necessary.

Step 3: Using OSNAP function.

Step 4: Draw conductors of appropriate dimension using LINE Command

Step 5: Use rectangular Array Command for making rows and columns of conductors

Step 6: Use p-line command for making arrows.

Step 7: Use Rectangular command for making poles.

Step 8: Make the numbers on the conductors using TEXT Command.

Step 9: Use Copy, Hatch, Donut, Arc Commands.

Step 10: Command: – q Save.

RESULT:

                  The AC Lap winding is drawn by using AutoCAD software.

Solution:

Slots/pole/phase (spp)= 18/(6 x 3)  =  1 slot

For full pitched coils, coil span= pole pitch =18/6=3 slots.

Top coil side 1 in slot 1 is connected to bottom coil side 8 in slot 4. Top coil side 3 in slot 2 is connected to bottom coil side 10 in slot 5 and so on.

Pole pitch corresponding to 180o electrical

Here, the no of slots in one pole pitch=3 slots

Thus one pole phase group consists of two slots.

Angle between consecutive slots = 180o /3 =60o electrical

We know that the phase one displaced by 120o electrical

No of slots by which the phase are displaced= 120o/60o = 2 slots

EXPERIMENT :8 

DOL STARTER

AIM:

         Draw the line diagram of DOL Starter using Auto cad software.

PROCEDURE:

Step 1: Set the limits of the drawing screen.

Step 2: Put ORTHO ON where as necessasary.

Step 3: Using OSNAP function.

Step 4: Draw line of appropriate dimension using LINE Command

Step 5: Draw circle of appropriate dimension using circle command.

Step 6: Use offset command.

Step 7: Use copy command.

Step 8: Use trim command.

Step 9: command:- q Save.

RESULT:

                 The line diagram of DOL Starter is drawn by using AutoCAD software.

EXPERIMENT :9

AUTOMATIC STAR DELTA STARTER

AIM:

         To draw the line diagram of fully automatic star delta Starter using Auto cad software.

PROCEDURE:

Step 1: Set the limits of the drawing screen.

Step 2: Put ORTHO ON where as necessasary.

Step 3: Using OSNAP function.

Step 4: Draw line of appropriate dimension using LINE Command

Step 5: Draw circle of appropriate dimension using circle command.

Step 6: Use offset command.

Step 7: Use copy command.

Step 8: Use trim command.

Step 9: command:- q Save.

RESULT:

                 The line diagram of fully automatic star delta Starter is drawn by using Auto cad software.

AUTOMATIC STAR DELTA STARTER

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