Encoder repairs are often outside the realm of expertise for some repair shops. At Servotech we know an encoder should produce pristine square waves, with proper output voltage levels, phase symmetry, and reliability at high speed. Some companies will say that if a servo motor encoder produces signals both before and after servo motor rebuild, than the motor is repaired. Small mechanical inconsistencies will become exacerbated by heat expansion unless the pre-load is set properly.
#SINANO AC SERVO DRIVE FULL#
A motor must run smoothly both cold and when it has reached full operational temperature. A brushed servo motor depends on proper bearing pre-load. Repaired servo motors have new bearings installed, however new bearings do no account for worn fits or bearing journals, nor do they fix broken or worn bearing shims and wave washers. Refurbishment means understanding bearing pre-load. At Servotech, brushed servo motors are meticulously tuned to ensure proper operation, acceleration and torque. An important effort requires an oscilloscope and very accurate power supplies, as neutral determines the smoothness of operation. Repaired motors go back together and they “run”, but refurbished DC brush motors also need to undergo a process called “setting neutral”. All armatures are then balanced to make sure the newly refinished surface will wear evenly. Then each commutator bar is cleaned out with a special tool that removes dirt and mica. Repaired and refurbished servo motors get new brushes, and are turned in a lathe to create a new even surface for brushes to ride on. Brushes will wear ridges into commutators, creating an uneven surface that can even create side wear – a very bad situation because changes in the geometry of the brush and can cause extreme high current. Refurbishment means turning and undercutting commutators. Repaired motors have degraded magnets – refurbished ones have saturated magnetism. Refurbishment, means re-magnetizing field frames and Tach fields – because over time the vibration and heat from operation degrades magnetism. Of servo motor brake, bearings & DC parts. Servo Motor Parts - We inventory a large stock Replacement Encoders Sales - OEM replacement and In addition to servo motor repair we offer:įeedback Device Repair - We repair encoders, resolvers, Authorized Yaskawa Servo Motor Repair Center.Authorized SEM Servo Motor Repair Center.Authorized Baldor Servo Motor Repair Center.Servo motor repair – Factory drive testing.Reliance-Electrocraft Servo Motor Repair.
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