Encoders · Resolvers · Hall sensors · Linear scales
Feedback device sales and service: encoders, resolvers and Hall sensors
Star Automations repairs, aligns, reprograms and supplies motor and machine feedback devices: incremental and absolute encoders, resolvers, Hall sensors, sin/cos encoders and linear scales. We serve plants across India and ship to overseas buyers. Send the label photo for a free repairability check; if repair is not possible we supply from stock or source a replacement.
What we do with feedback devices
Six services on one bench, for any make you can photograph.
| Repair | Bearing, cable, connector and electronic faults on encoders, resolvers, Hall sensors and linear scales, followed by a run test and a printed report. |
|---|---|
| Align | Encoder or resolver alignment to the rotor after bearing, winding or encoder work. See how to check alignment. |
| Reprogram | Memory read and programming on supported serial encoders. See encoder programming. |
| Replace | Replacement encoders fitted and aligned, from stock or sourced. See encoder replacement. |
| Supply | New-surplus, refurbished-and-tested and used feedback devices, condition stated on every quote. |
| Source | Obsolete and hard-to-find parts, in India and abroad. |
Feedback device types we repair and supply
Pick the type on your nameplate or drive alarm; each links to its own repair page.
| Incremental encoder (A, B, Z) | Pulse output counted from a reference. Incremental encoder repair and quadrature A, B, Z alignment. |
|---|---|
| Absolute encoder | Unique position at power-up, single-turn or multi-turn, parallel or serial. Absolute encoder repair and parallel absolute encoders. |
| Serial motor feedback | EnDat, Hiperface, SSI and maker-specific serial links such as Fanuc Pulsecoder, Mitsubishi, Yaskawa, Tamagawa and Sanyo Denki encoders. See the maker list below. |
| Sin/cos encoder | Analogue sine and cosine signals with commutation tracks. Sine/cosine encoder repair. |
| Resolver | Analogue, rugged, no electronics in the sensor. Resolver repair, single-speed and multi-speed. |
| Hall sensor (BLDC) | Rotor sector sensing for commutation. Hall sensor repair and alignment. |
| Linear scale and reading head | Position feedback for linear axes and machine tools. Linear scale repair. |
Not sure which you have? Read encoder, resolver or Hall sensor: how each works and absolute vs incremental encoder.
Encoder and feedback device makes we repair and supply
Every make below has its own page. If yours is not listed, send the label photo.
Motor feedback makers
- Heidenhain
- SICK Stegmann
- Tamagawa and Panasonic
- Fanuc Pulsecoder
- Mitsubishi
- Yaskawa
- Sanyo Denki, Sumtak and Kawasaki
- Indramat
- Delta
- Sumtak
Industrial encoder makers
- Kübler
- Baumer
- Hengstler
- Autonics
- Omron
- Eltra
- Lika
- Pepperl+Fuchs
- Dynapar
- Koyo
- Leine & Linde
- POSITAL (Fraba)
- Wachendorff
- Renco
- BEI
- Encoder Products Company
- Nemicon
- Ono Sokki
- Unico
- DRC
- Global Encoder
- MTL
- Sonder
- Thalheim
Optical and linear
Servo motor brands, with their own feedback, are on servo motor repair by brand. Star Automations is an independent multi-brand repair company and is not an OEM or authorised service centre; brand names only describe the units we repair and supply.
Buy feedback devices: new-surplus, refurbished and used
We check our stock in Chennai, Puducherry and Bengaluru first, then source to order.
| New-surplus | Unused units from surplus stock. Useful when the model is obsolete or the lead time is long. |
|---|---|
| Refurbished and tested | Repaired, feedback tested and aligned, and run-tested before dispatch. |
| Used, as removed | Removed from working machines and sold as removed. A bench test can be requested. |
Prices are not published because they depend on the make, model and condition. Each quote states the condition, price, warranty terms and lead time. Related: sensors and encoders sourcing, Heidenhain, Hiperface and resolver spares and servo motors for sale.
Service and supply for buyers outside India
From India to plants, OEMs and repair depots abroad.
- Send the label photo or part number and the fault by WhatsApp or email.
- We confirm repairability, availability and condition in writing before any quote.
- You confirm the order and payment terms.
- We test, pack and ship with the export documents. Star holds its own Importer-Exporter Code, and our own offices in the USA, Europe and the Middle East and associate partners in China, Japan, Korea and Hong Kong support cross-border sourcing.
See industrial spares for overseas buyers and global OEM repair and refurbishment from India.
Encoder, resolver or Hall sensor: which is on your motor?
Encoder
Digital optical or magnetic feedback with fine resolution. Common on servo motors, spindles and machine axes.
Resolver
Analogue feedback with no electronics in the sensor. Common where heat, shock or vibration is high, and on many EV and industrial motors.
Hall sensor
Three-signal rotor sector sensing. Common on BLDC motors, fans and hub motors.
Resolvers and encoders in radar, aerospace and naval equipment
Brushless resolvers, synchros and high-resolution absolute encoders sit inside radar pedestals, electro-optical gimbals, aircraft actuators and ship systems. See servo motors for radar, aerospace, naval and other high-precision systems for the motors, makers and sectors.
Drive alarms that point to a feedback device
- Encoder, feedback or communication alarm on the drive
- Motor runs rough or shakes at start
- Position lost or axis drifts after a bearing or winding job
- Over-speed or over-current trips with no load change
- BLDC motor will not start or jerks
- Absolute position lost after power-off
Guides: servo encoder alarms on Fanuc, Yaskawa and Mitsubishi drives, absolute encoder battery alarms and choosing motor feedback.
What is a feedback device on a motor or machine?
A feedback device is the sensor that tells a drive or controller the position, speed or rotor angle of a motor or axis. The main types are incremental encoders, absolute encoders, resolvers, Hall sensors and linear scales. When it fails, the drive shows an encoder, feedback or commutation alarm and the axis stops.
What is the difference between an incremental and an absolute encoder?
An incremental encoder sends pulses (channels A, B and usually Z) and the controller counts them from a reference, so position is lost at power-off unless it is re-referenced. An absolute encoder sends a unique position value, so the machine knows its position at power-up. Single-turn absolute encoders cover one revolution; multi-turn types also count revolutions.
What is the difference between a resolver and an encoder?
A resolver is an analogue position sensor with an excitation winding and sine and cosine output windings. It has no electronics or optical disc in the sensor, so it tolerates heat, shock and vibration well. An encoder is digital (optical or magnetic) and usually gives finer resolution. Drives need the matching interface for either type.
What does a Hall sensor do in a BLDC motor?
Three Hall sensors give the drive the rotor sector so it can switch the motor phases in the right order. A wrong Hall order or a failed sensor causes no-start, jerky running or over-current trips. We test Hall sensors and align them to the winding.
Which serial encoder interfaces do you handle?
We work with the serial feedback used on motors from Heidenhain (EnDat), SICK Stegmann (Hiperface), Hengstler (SSI), Fanuc, Mitsubishi, Yaskawa, Tamagawa and Sanyo Denki, among others. Send the label photo for any other interface and we confirm before you ship.
Do you repair every make of encoder, resolver and Hall sensor?
We repair a very wide range of makes, and our universal feedback test equipment covers more than 100 makers. Where a specific unit cannot be repaired, we say so after the free check and offer a replacement from stock or sourcing.
Do you sell encoders, resolvers and Hall sensors, or only repair them?
Both. We supply feedback devices from our stock of new-surplus, refurbished-and-tested and used units, and we source to order when we do not hold the part. Condition, price, warranty terms and lead time are stated on every quotation.
Can you supply any feedback device in the world?
We cannot stock every part, but we can check stock and our sourcing network for almost any encoder, resolver or sensor, including obsolete ones. Send the part number or label photo and we tell you what is available, in what condition, before any quote.
Do you ship feedback devices outside India?
Yes. We supply and ship to overseas buyers, and Star holds its own Importer-Exporter Code. For units sent to us from abroad, contact us first so we can arrange shipping and customs paperwork.
Should I repair or replace a failed encoder?
Repair is usually quicker and cheaper when the failure is a bearing, cable, connector or electronic fault. Replacement makes sense when the disc or sensing element is destroyed or the unit is not repairable. We tell you which after the free repairability check.
My motor was re-bearinged or rewound elsewhere and now loses position. Why?
Bearing or encoder work often disturbs the encoder or resolver alignment to the rotor. We read the feedback, set the alignment and prove it in a run test. See the encoder alignment page for the process.
Can you read or reprogram encoder memory?
Yes, for supported serial encoders we read the memory and reprogram it, including motor data on encoders such as the Heidenhain EQI series. Send the label photo to confirm the model.
Do you repair linear scales and reading heads?
Yes. We repair linear scales and reading heads and test them with the same universal feedback equipment. See the linear scale repair page.
How long does feedback device repair take?
Emergency same day, urgent 3 working days and standard 7 working days, where the fault and parts allow. Turnaround counts from when the unit reaches our bench and the quote is approved.
What warranty do you give?
Repair warranty is 3 months to 1 year, stated on each quotation.
What should I send for a quote?
A photo of the label or nameplate, the fault or alarm shown by the drive, and the make and model of the motor or machine. Send it on WhatsApp +91 97866 22233 or email info@starautomations.com.
Are you an OEM or authorised service centre?
No. Star Automations is an independent multi-brand repair company, not an OEM or authorised service centre. Brand names only describe the equipment we repair and supply.