LEROY-SOMER Repair Services India
Leroy-Somer is a globally recognized French manufacturer of electric motors, alternators, and variable frequency drives headquartered in Angouleme. With over a century of engineering excellence, Leroy-Somer supplies synchronous and asynchronous motors to industrial sectors worldwide. In India, Leroy-Somer motors power textile mills, sugar factories, cement plants, and steel rolling operations. Their reputation for reliability and precision makes them a preferred choice among Indian plant engineers seeking durable, efficient drivetrain solutions.
Leroy-Somer is a globally recognized French manufacturer of electric motors, alternators, and variable frequency drives headquartered in Angouleme. With over a century of engineering excellence, Leroy-Somer supplies synchronous and asynchronous motors to industrial sectors worldwide. In India, Leroy-Somer motors power textile mills, sugar factories, cement plants, and steel rolling operations. Their reputation for reliability and precision makes them a preferred choice among Indian plant engineers seeking durable, efficient drivetrain solutions.
Synchronics Electronics specializes in diagnosing and repairing Leroy-Somer electric motors, wound-rotor motors, squirrel-cage induction motors, and associated control systems. Our 180+ engineers have restored hundreds of failed Leroy-Somer units across Indian industrial clusters — from overheated stator windings to bearing degradation and shaft misalignment. We stock spare components, perform dynamic balancing, and execute full rewind services. Indian manufacturers trust Synchronics for fast turnaround and factory-equivalent performance restoration on Leroy-Somer equipment.
Complete Leroy-Somer motor and drive repair — rewind, balancing, diagnostics PAN India.
LEROY-SOMER Equipment We Repair — By Category
LEROY-SOMER Product Lines We Repair
Our engineers are trained on the full LEROY-SOMER product range. Below are the major product families we service.
Leroy-Somer Synchronous Motors
Fixed-speed alternating current motors rated 0.75 kW to 250 kW, commonly used in constant-torque pump drives and compressor applications. Prone to bearing seizure, winding insulation breakdown under thermal stress, and rotor bar fractures from vibration.
Leroy-Somer Asynchronous (Induction) Motors
Three-phase squirrel-cage induction motors from 0.37 kW to 315 kW, standard in textile, food processing, and general-purpose industrial duty. Typical faults include stator winding insulation failure, rotor bar cracking, and bearing wear from continuous duty cycles.
Leroy-Somer Wound-Rotor (Slip-Ring) Motors
Medium-voltage synchronous and wound-rotor motors for high-inertia startup loads in cement mills, sugar plants, and steel mills. Repair challenges include slip-ring carbon wear, brush assembly degradation, and rotor winding insulation fault diagnosis.
Leroy-Somer Variable Speed Drives and Soft Starters
Electronic soft-start and variable frequency drive modules for motor speed control and power factor correction. Common issues include thyristor or IGBT failure under inrush current, cooling fan malfunction, and firmware version incompatibility with legacy motor models.
Why Choose Synchronics for LEROY-SOMER Repairs?
PCB-Level Expertise
We repair down to the component level — not just swap boards. Our engineers identify root causes, replace failed IGBTs, capacitors, processors, and gate drivers on LEROY-SOMER equipment.
Fast Turnaround
Standard 7–10 working days. Express 3–5 days available for critical breakdowns. Emergency same-day/next-day service for unplanned downtime.
6-Month Warranty
Every repaired unit ships with a 6-month comprehensive warranty on parts and labour. Our repair success rate is over 94% across all brands.
All-India Service
Couriered repairs accepted from any city in India. Doorstep pickup available in Vadodara, Mumbai, Pune, Ahmedabad, Surat, Chennai, and more.
Common LEROY-SOMER Equipment Faults We Fix
Based on 30+ years of repair data, these are the most frequent failure modes we see in LEROY-SOMER equipment arriving at our workshop.
- ✓Stator winding insulation failure and phase-to-ground fault — Leroy-Somer motors in Indian sugar and textile mills operate in high-humidity, dusty environments where moisture ingress and thermal cycling degrade varnish coating. Extended overload operation and inadequate cooling ventilation accelerate insulation aging, leading to breakdown voltages below 500V DC.
- ✓Rotor bar cracking and end-ring fracture in squirrel-cage rotors — Leroy-Somer induction motors subjected to repetitive torque pulsations (common in pulp mill beatering equipment, sugar cane crushers) develop micro-cracks in aluminum rotor bars and braze-joint fractures. Thermal expansion mismatch and vibrational fatigue initiate cracks over 5-10 years of duty.
- ✓Bearing preload loss and outer race spalling in sleeve bearings — Leroy-Somer motors in continuous process industries (textile spinning, cement grinding) experience accelerated bearing wear due to inadequate lubrication schedules, contaminated grease, and misalignment from worn couplings. Outer race spalling initiates vibration and rapid degradation.
- ✓Slip-ring wear and brush assembly carbon deposits in wound-rotor motors — Leroy-Somer wound-rotor motors in high-speed lathe spindles and rolling mill motors experience brush-slip-ring interface wear over 15,000 operating hours. Carbon brush buildup and corrosion on bronze slip-rings increase resistance, causing heating and voltage drop in rotor external resistance circuit.
- ✓Softstarter thyristor or IGBT failure during inrush current transient — Leroy-Somer soft-start modules in Indian industrial applications face high inrush current spikes (8-10 x rated current) from direct-online starting of large fan and pump motors. Transient voltage spikes and inadequate snubber circuit design cause thyristor overstress and gate-drive circuit failure.
- ✓Leroy-Somer motor terminal box moisture ingress and copper lug corrosion — Coastal Indian plants (Gujarat, Maharashtra) and locations with seasonal flooding experience salt-spray and condensation in motor terminal boxes. Leroy-Somer terminal box gaskets deteriorate, allowing moisture and ammonia fumes to corrode copper cable lugs and stud connections, increasing electrical contact resistance.
How We Repair Your LEROY-SOMER Unit
Receive & Log
Your unit is logged into our tracking system with a unique job number. You receive WhatsApp / email updates at every stage.
Fault Diagnosis
Board-level diagnosis using oscilloscopes, LCR meters, and thermal cameras. Root cause identified before any repair begins.
Component Repair
Faulty ICs, capacitors, MOSFETs, IGBTs, and gate drivers replaced with genuine or equivalent-spec components.
Full-Load Test
Unit tested under rated load with original or equivalent motor. All parameters verified. 6-month warranty issued.
Industries Using LEROY-SOMER Equipment
We serve plant maintenance teams across all major industries where LEROY-SOMER automation is deployed.
Frequently Asked Questions — LEROY-SOMER Repairs
Do you repair Leroy-Somer equipment anywhere in India?+
Yes. Synchronics repairs the complete Leroy-Somer range — synchronous motors, induction motors, wound-rotor motors, soft-starters, and variable frequency drives. We offer PAN India pickup from Mumbai, Delhi, Pune, Chennai, Hyderabad, Ahmedabad, Jaipur, Kolkata, and smaller cities. All repairs are executed in our 12,000 sq.ft. facility in Vadodara, Gujarat, with 48-72 hour turnaround for urgent breakdowns.
What is your experience with Leroy-Somer wound-rotor (slip-ring) motors used in cement mills?+
Synchronics has restored over 120 Leroy-Somer wound-rotor motors in Indian cement plants. These high-inertia machines require precise slip-ring and brush maintenance, rotor bar insulation testing, and external resistance circuit diagnosis. We maintain spare rotor windings for LS225LR-LS315LR models and perform field commissioning with load acceptance trials. Our engineers understand cement mill duty cycles and thermal cycling challenges.
Can Synchronics handle Leroy-Somer motor rewinds with Class F insulation for tropical climates?+
Absolutely. Synchronics specializes in rewinding Leroy-Somer stators with Class F (155C) insulation systems rated for hot, humid Indian environments. We use moisture-resistant epoxy varnish, hygroscopic insulation materials, and execute partial discharge (PD) testing at operating voltage. Each rewound motor undergoes thermal cycling (20 hours at 1.1 x rated current) to simulate field conditions before delivery.
What soft-starter faults do you diagnose in Leroy-Somer LS3000 and LS5000 modules?+
Synchronics diagnoses firing angle drift, phase-imbalance, thyristor gate-drive failures, snubber circuit degradation, and cooling fan malfunction in Leroy-Somer soft-starters. We perform oscilloscope analysis of gate signals, thermal imaging of power semiconductors, and load simulation testing. Faulty modules are repaired or replaced with genuine Leroy-Somer components, with full 90-day warranty on labor and parts.
How much does Leroy-Somer motor repair cost compared to buying a new motor in India?+
Synchronics repair costs range from 25-60% of new motor price, depending on fault severity and motor size. Stator rewinds for LS112M-LS160M induction motors cost Rs. 18,000-35,000; bearing replacement and balancing, Rs. 8,000-15,000; wound-rotor slip-ring restoration, Rs. 25,000-50,000. New Leroy-Somer motors of equivalent power cost 3-4x more. For critical applications, repair extends motor life by 8-10 years, making it economical. We provide written cost estimates within 24 hours of fault diagnosis.
How do I send my LEROY-SOMER unit for repair?+
Pack the unit securely and courier it to our Vadodara workshop. Include a note with the fault description and your contact details. We will log it into our system and WhatsApp you a job number within 24 hours of receipt. Doorstep pickup is available in Vadodara, Ahmedabad, Surat, Mumbai, and Pune.
What is the cost of repairing a LEROY-SOMER drive or PLC?+
Repair cost depends on the model and the fault. We offer a free diagnosis — once we identify the fault, we provide a fixed quotation before proceeding. Typical repairs cost 20–40% of the new unit price. We will never repair without your approval.
What warranty do you provide on LEROY-SOMER repairs?+
All repaired units carry a 6-month comprehensive warranty covering the same fault and related issues. If the fault recurs within the warranty period, we repair it free of cost.
Do you provide a no-fix, no-fee guarantee?+
Yes. If we cannot repair your LEROY-SOMER unit after diagnosis, you pay only the diagnosis fee (₹500–₹1,500 depending on the product). The unit is returned to you at no additional charge.
LEROY-SOMER Repair Catalog
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Send us your faulty industrial electronics. Our engineers will diagnose it and provide a detailed quote within 24 hours — with no obligation to proceed.
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48hr Turnaround
Fastest in India
6-Month Warranty
Every repair
No Fix, No Charge
Zero risk policy
Pan-India Pickup
Doorstep service