Servo Motor Repair
Precision servo motor repair — encoder replacement, stator rewinding, bearing change, brake service, and dynamic balancing to ISO 1940 for all major CNC and automation brands.
India's premier servo motor repair facility. Our dedicated motor shop with precision winding machines, encoder calibration rigs, dynamic balancing equipment, and servo drive test benches restores your servo motor to OEM specifications — not just a temporary fix.
Servo motors are precision electromechanical components where even minor degradation in bearings, windings, or encoder alignment causes measurable loss of accuracy, repeatability, and surface finish in CNC machines, robotic systems, and high-speed automation. Synchronics has a dedicated servo motor repair facility equipped with precision winding machines, encoder calibration stations, insulation test equipment, and dynamic balancing machines compliant with ISO 1940. Every repaired servo motor is tested on our servo drive test bench under actual operating conditions before dispatch.
Diagnosis Guide
Common Servo Motor Problems We Fix
Experiencing any of these symptoms? Our engineers have diagnosed and repaired thousands of these faults.
Encoder Failure / Signal Loss
Servo alarm on drive, position error, runaway condition, intermittent axis faults, homing failure
Encoder disc contamination, cable connector damage, encoder IC failure, bearing wear causing shaft runout
Winding Short / Open
Overcurrent alarm, motor overheating, reduced torque, drive trips at load, burning smell
Insulation breakdown from overheating, moisture ingress, mechanical damage to stator, voltage spike
Bearing Noise / Vibration
Audible grinding or rumbling noise, visible shaft play, surface finish marks on machined parts, excessive vibration
Bearing wear from age or contamination, improper lubrication, shaft misalignment, overloading
Shaft Damage
Coupling slippage, keyway worn, shaft bent causing wobble, poor repeatability on axis
Mechanical impact, coupling overtightened, corrosion, fatigue from cyclic loading
Brake Failure
Axis drops when power off (vertical axis), brake not holding, grinding noise from brake disc, servo alarm
Brake disc worn below minimum thickness, brake coil open, air gap exceeded, spring fatigue
Motor Overheating
Thermal alarm on drive, motor surface too hot to touch, derating during operation, intermittent shutdowns
Winding insulation degradation, blocked cooling, bearing drag, excessive duty cycle, ambient temperature
How It Works
Our Servo Motor Repair Process
A systematic, schematic-driven repair process — from receipt to dispatch.
Receive & Mechanical Inspection
Servo motor is logged into ERP with full photographic documentation. External inspection for shaft damage, connector condition, housing cracks, and nameplate data recording.
Electrical Tests
Winding resistance (per phase), insulation resistance (megger test), winding surge comparison test, and inductance balance check performed before disassembly.
Encoder & Feedback Test
Encoder signals tested — A/B/Z channels for incremental, absolute position data for serial encoders. Commutation alignment and signal quality verified on oscilloscope.
Repair & Rebuild
Failed components repaired or replaced — stator rewound, bearings changed, encoder replaced, brake disc renewed, shaft repaired. All work performed to original OEM specifications.
Dynamic Balance & Assembly
Rotor dynamically balanced to ISO 1940 G2.5 standard on two-plane balancing machine. Motor reassembled with new seals, correct bearing preload, and brake air gap set.
Drive Test & Dispatch
Repaired motor tested on servo drive test bench — no-load and loaded operation, encoder feedback verification, thermal run, and vibration check. 6-month warranty issued.
Thorough Inspection
What We Inspect in Every Servo Motor
Every unit goes through a comprehensive inspection checklist before and after repair.
Stator Winding
Rotor Assembly
Bearings
Encoder / Resolver
Brake Mechanism
Shaft & Keyway
The Synchronics Advantage
Why Choose Us for Servo Motor Repair
In-House Winding Rewind Capability
Our motor shop has precision winding machines and impregnation facilities to rewind servo motor stators to exact OEM specifications — matching wire gauge, turn count, insulation class, and winding pattern.
Encoder Calibration Expertise
We carry a comprehensive inventory of encoders for Fanuc, Siemens, Mitsubishi, and Yaskawa servo motors. Our calibration rig ensures zero-point alignment and commutation accuracy after every encoder replacement.
Dynamic Balancing to ISO 1940
Every repaired rotor is dynamically balanced to ISO 1940 G2.5 (or G1.0 for high-speed spindle motors) on our computerised two-plane balancing machine — eliminating vibration and extending bearing life.
Troubleshooting
Common Servo Motor Fault Alarms We Fix
Seeing one of these error codes? We diagnose and repair the root cause.
Encoder signal lost, corrupted, or out of tolerance
Encoder hardware failure, cable damage, connector pin fault, bearing wear causing shaft runout
Motor current exceeded safe operating limit
Winding short circuit, insulation failure, mechanical jam, bearing seizure, load collision
Motor temperature exceeded thermal limit
Winding insulation degradation, blocked cooling, bearing drag, excessive continuous duty
Winding-to-ground insulation below safe threshold
Moisture ingress, insulation ageing, overheating history, mechanical damage to stator
Holding brake not engaging/releasing correctly
Brake coil open circuit, friction disc worn, air gap too large, brake power supply fault
Excessive vibration detected during operation
Rotor imbalance, bearing defect, shaft misalignment, loose mounting, coupling wear
Servo motor alarms are typically reported by the servo drive or CNC controller (Fanuc, Siemens 840D, Mitsubishi, etc.). Contact us with your drive alarm code and motor model for expert diagnosis.
Industries Served
Where Servo Motors Are Used
CNC Machines
Spindle motors, axis feed motors, tool changer motors, turret motors
Robotics
Robot arm joint motors, wrist axis servos, positioner motors
Semiconductor
Wafer handling servos, precision positioning motors, clean room motors
Packaging
Form-fill-seal axis motors, labeller servos, carton erector drives
Printing
Impression cylinder motors, registration servos, web tension motors
Injection Moulding
Clamp axis motors, injection screw servos, ejector motors
Trusted Brands
Brands We Service
Component-level repair for all major manufacturers
FAQ
Frequently Asked Questions
Yes. Our precision winding machines and impregnation process match the original wire gauge, turn count per slot, insulation class, and winding pattern exactly. After rewinding, we perform surge comparison and insulation resistance tests to verify the new winding meets OEM specifications. Most customers report no measurable difference in motor performance after our rewind.
Yes. We maintain a ready inventory of encoders and resolvers for Fanuc alpha and beta series, Siemens 1FT6/1FT7/1FK7, Mitsubishi HG/HC, and Yaskawa SGMG/SGMS motors. After encoder replacement, we perform zero-point calibration and commutation alignment on our dedicated calibration rig.
Dynamic balancing removes residual mass imbalance from the rotor by adding or removing material at precise locations. Even minor imbalance causes vibration at operating speed, leading to premature bearing failure and poor surface finish on machined parts. We balance to ISO 1940 G2.5 as standard, and G1.0 for high-speed spindle motors, using a computerised two-plane balancing machine.
Yes. We perform shaft straightening, keyway recutting, spline repair, and precision cylindrical grinding to restore shaft dimensions. For severely damaged shafts, we can manufacture replacement shafts to original drawing specifications. Shaft runout is verified to be within OEM tolerance before reassembly.
Servo Motor Repair Services Across India
Synchronics provides expert servo motor repair services for industries across India — Vadodara, Ahmedabad, Mumbai, Pune, Chennai, Bangalore, Delhi, Kolkata, and all major industrial and CNC manufacturing hubs. Our pan-India logistics network ensures your servo motor reaches our facility safely and is returned promptly after repair.
Whether you have a small 100W Panasonic servo from a packaging machine or a 75kW Fanuc spindle motor from a heavy-duty CNC lathe, our dedicated motor repair shop has the winding machines, encoder calibration rigs, dynamic balancing equipment, and servo drive test benches to restore it to OEM specifications. We service all major brands including Fanuc, Siemens, Mitsubishi, Yaskawa, Allen Bradley, Bosch Rexroth, and Kollmorgen — getting your machine back into production with precision and reliability.
Get Your Equipment
Back in Action — Fast
Send us your faulty industrial electronics. Our engineers will diagnose it and provide a detailed quote within 24 hours — with no obligation to proceed.
Free Evaluation
No obligation
48hr Turnaround
Fastest in India
6-Month Warranty
Every repair
No Fix, No Charge
Zero risk policy
Pan-India Pickup
Doorstep service