Servo Motor and Encoder Repair and Service

Comprehensive Motor and Encoder Service

Servo motors and encoders are critical components of motion control systems in CNC machines, industrial robots and automated production lines. Their failure paralyzes the entire machine. EFIXLAB offers professional repair and regeneration of all types of servo motors, stepper motors and position encoders.

Servo Motors — Supported Manufacturers

Siemens

Full Siemens servo and spindle motor range:

1FK7 / 1FK2 — SIMOTICS S synchronous servos (winding repair, encoder replacement)
1FT7 / 1FT6 — high-performance servos (bearing replacement, brake repair)
1PH7 / 1PH8 — main spindle motors (stator rewinding, cooling system repair)
1FL6 — SIMOTICS S-1FL6 compact servos (encoder replacement)
1FN3 — linear motors (magnetic strip and coil service)

Fanuc

Alpha iF/iS — CNC servo motors (winding repair, pulsecoder regeneration)
Alpha i Spindle — main spindle motors (stator rewinding, bearing replacement)
Beta iS — compact servos (encoder repair, brake replacement)
AC Servo Motor — older series (legacy servo regeneration)

Yaskawa

Sigma-7 — SGMJV, SGMSV series (winding repair, absolute encoder replacement)
Sigma-5 — SGMGV, SGMAV (bearing, brake, commutator repair)
Sigma-II — SGMGH, SGMAH (legacy servo regeneration)
AC Spindle Motors — QMAMG, QMEMG (spindle motor rewinding)

Mitsubishi Electric

HG-KR / HG-MR — compact servos (winding, encoder repair)
HG-SR / HG-JR — medium and high power (bearing replacement, brake service)
HC-SFS / HC-MFS — older series (legacy motor regeneration)

Bosch Rexroth / Indramat

MSK — synchronous servo motors (encoder replacement, winding repair)
MKD — compact servos (bearing, brake regeneration)
Indramat MAC — legacy servos (complete regeneration)

Lenze

MCS — synchronous servos (motor regeneration, encoder service)
MCA — asynchronous servos (winding, bearing repair)

SEW Eurodrive

CMP / CMPZ — synchronous servos (motor regeneration)
CM3C — asynchronous servos (stator rewinding)

Kollmorgen

AKM — compact servos (encoder and brake repair)
Goldline — legacy series (motor regeneration)

Baldor / ABB

BSM — brushless servos (encoder replacement, winding repair)
Baldor Electric — industrial motor regeneration

Stepper Motors

We repair stepper motors from leading manufacturers:

Oriental Motor — PK, AR series (winding repair, driver matching)
Nanotec — ST series (bearing replacement, connector repair)
Applied Motion — HT series (stepper with encoder regeneration)
Schneider Electric (IMS) — MDrive series (integrated motor repair)
Nidec (Servo Tek) — stepper motor regeneration

Encoders — Supported Manufacturers

Heidenhain

A reference in precision encoders:

ROD / RON / ROC — incremental rotary encoders (disc replacement, bearing service, signal regeneration)
ERN / ECN / EQN — absolute rotary encoders (EnDat/BiSS/SSI interface repair)
LC / LB / LS — linear scales (reading head replacement, tape cleaning)
AELB / AELC — exposed linear encoders (head replacement, signal adjustment)
EIB / IBV / IK — interpolation electronics (signal amp and filter repair)

Sick / Sick Stegmann

DFS60 — incremental (disc, bearing, PCB replacement)
AFS60 / AFM60 — absolute (multi-turn gearbox repair)
SRS / SRM — motor encoders (feedback replacement in servos)
DBS36/60 — heavy-duty (seal replacement, corrosion repair)

Baumer

EIL580 — incremental (bearing and disc replacement)
EAL580 — absolute (Wiegand sensor, gearbox repair)
HOG/POG — heavy-duty industrial (shaft and seal repair)

Hengstler

RI58 — incremental (glass disc replacement, index repair)
AC58 — absolute (SSI/BiSS interface, multi-turn gearbox repair)
AD58 — heavy-duty absolute (IP67 sealing regeneration)

Pepperl+Fuchs

RVI/RVS58 — incremental (bearing/disc repair)
AVS58 — absolute (multi-turn repair, communication module)

Kübler

Sendix 5xxx — incremental/absolute (compact encoder repair)
Sendix Heavy Duty — IP69K harsh-environment encoders

Renishaw

RGH / RESOLUTE — high-resolution linear/rotary encoders (head alignment, signal calibration)
TONiC / VIONiC — compact optical encoders (head and scale service)
ATOM — miniature encoder (reading head signal repair)

Typical Motor Failures

Winding Problems

Short circuit — inter-turn insulation breakdown, motor overload
Ground fault — winding-to-housing insulation breakdown (Megger test)
Open circuit — broken conductor, damaged connection
Overheating — excessive current, blocked cooling, excessive load

Bearing Failures

Noise — worn bearings, balls/races damage
Vibration — bearing looseness, spalling
Shaft play (radial/axial) — seal wear, contamination
Overheating — no or excess grease, preload loss

Brake Problems

Not releasing — coil, cable or connector damage
Not holding — disc wear, spring fatigue
Noise on release/engage — mechanical wear, air gap setting

Encoder Problems (motor-mounted)

Position loss — encoder disc, battery or connection damage
Noise in signals — contaminated disc, bearing wear
Communication errors — EnDat, BiSS, Hiperface interface problems
Incorrect speed reading — signal line damage, cable problems

Cooling System Problems

External fan failure — motor damage, blade contamination
Liquid cooling leaks — seal damage (spindle motors)
Thermistor / PT100 failure — incorrect temperature readings

Typical Encoder Failures

Mechanical Problems

Bearing wear — play, noise, shaft deflection
Shaft coupling damage — coupler wear, breakage
Seal failure — moisture/dust ingress
Glass disc damage — crack, contamination, coating damage

Signal Problems

Weak signal — LED/sensor degradation, optical contamination
Noise — EMI interference, cable shielding damage
Index loss — reference point damage
Incorrect counts / drift — resolution/disc mismatch or damage

Communication Interface Problems

No response to query — bus controller damage (EnDat/BiSS/SSI)
CRC errors — transmission line damage, impedance mismatch
Absolute position loss — battery failure, multi-turn gearbox failure
Data gaps — intermittent connections, damaged cables