HT/LT Motor Rewinder

3 phase HT & LT Motor rewinding, testing, DC Motor knowledge will be prefer

We are seeking a skilled and detail-oriented HT/LT Motor Rewinder with hands-on expertise in rewinding, overhauling, and testing 3-phase High Tension (HT) and Low Tension (LT) AC motors, as well as Direct Current (DC) motors.

The ideal candidate will be responsible for diagnosing insulation failures, taking winding data, rewinding coils, performing insulation vacuum pressure impregnation (VPI) or varnishing, assembling motors, and performing comprehensive pre-commissioning electrical tests.

Key Responsibilities

1.⁠ ⁠Winding & Fabrication

 * Rewinding AC Motors: Dismantle, strip, calculate/record winding data, prepare slots, coil-wind, and insert coils for 3-phase LT (up to 415V/690V) and HT (3.3kV, 6.6kV, 11kV) motors.

 * DC Motor Overhaul: Rewind armature coils, field coils, interpoles, and equalizer connections for DC motors; perform commutator skimming and undercutting.

 * Insulation System: Form, shape, and apply slot insulation, phase separators, wedges, and overhang lashing/binding using suitable temperature class insulation (Class F / Class H).

 * Brazing & Soldering: Perform silver brazing or lead soldering of coil leads, star/delta connections, and neutral jumpers.

2.⁠ ⁠Assembly & Mechanical Overhaul

 * Conduct mechanical dismantling, cleaning, rotor balancing, bearing replacement, and final end-bell assembly.

 * Inspect mechanical fits (bearing journals, housing fits, shaft run-out).

3.⁠ ⁠Electrical Testing & Diagnostics

 * Perform Pre-Strip & Post-Rewind Electrical Tests, including:

  * Insulation Resistance (IR) & Polarization Index (PI) using a Megger.

  * Winding Resistance Measurement (using Micro-ohm meter / Kelvin bridge).

  * High Potential (Hi-Pot) Testing (AC/DC).

  * Surge Comparison Testing to detect turn-to-turn short circuits.

  * Voltage Ratio & Drop Tests on DC armatures / field coils.

  * No-load running tests and vibration monitoring upon final reassembly.

Qualifications & Skills

Required Technical Skills

 * 3-Phase HT/LT AC Expertise: Deep understanding of random-wound coils and form-wound coils for HT induction motors.

 * DC Motor Competency: Sound knowledge of armature winding patterns (Lap & Wave windings), commutator maintenance, and brush gear setting.

 * Testing Equipment Proficiency: Hands-on experience operating Megohmmeters, Surge Testers, Resistance Meters, Hi-Pot Testers, and Multimeters.

 * Blueprint Reading: Ability to interpret winding diagrams, electrical schematics, and manufacturer nameplate data.

Minimum Qualifications

 * Education: ITI / Diploma in Electrical Engineering or equivalent trade apprenticeship certification.

 * Experience: 3 to 5+ years of practical experience in an electrical motor repair facility, heavy industry plant, or rewind workshop.

Physical Requirements & Working Conditions

 * Ability to lift heavy components, work with overhead cranes, and use hand power tools safely.

 * Familiarity with workshop safety protocols, lockout/tagout (LOTO), and personal protective equipment (PPE).