Electrical Machines and Equipment
Electrical Machines and Equipment
Electrical Machines and Equipment
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<strong>Electrical</strong> Technology Department<strong>Electrical</strong> <strong>Machines</strong> & <strong>Equipment</strong>sDetailed Practical ContentsHours Contents Related Tasks1-Rewinding of three-phase induction motors:60a) Basics of three-phase induction motors rewinding Types of winding <strong>and</strong> determination of coil pitch. Selection of the suitable wire size. Determination of the suitable number of turns per phase. Calculation of the number of turns per coil. Identification of the coil terminals for internal <strong>and</strong> externalconnections.b) Steps of rewinding three-phase induction motors Read name plate data. Dismantle <strong>and</strong> clean the motor. Remove the windings. Note the winding data <strong>and</strong> the circuit. Draw the winding diagram. Identify winding connections. Prepare the motor for rewinding4. Clean the slots.5. Select insulating materials.6. Perform the needed insulation. Determine the size <strong>and</strong> form of the coils. Adjust the rewinding machine <strong>and</strong> wind the required number ofcoils. Insert the coils in the slots <strong>and</strong> connect the coil terminals. B<strong>and</strong>age the windings. Assemble the motor. Connect <strong>and</strong> test the motor.c) Exercises: Rewinding of three-phase induction motors with a single coilside per slot.A1 up to A9,B3, B4H1, H2,H3, H4, H5, H6,H7, H8, H9,H10, H11, H12Rewinding of a two-speed motor D/YY (2&4 poles). Rewinding of a two-speed motor Y/Y (6&4 poles).- 57 -
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