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DC Servo Motor Repair

DC servo motors, or brushed servo motors, are the earliest form of servo motors and have been phased out by many manufacturers in favor of AC servo motors. However, there is still a huge demand for repairing these motors as there are hundreds of thousands of machines still in operation that use them. Our DC repair department is highly skilled at diagnosing and repairing these brushed motors of all sizes.

Frequent Reasons a DC Servo Motor Would Need Repair:

worn servo motor brushes that were replaced during the servo motor repair process

Worn Brushes

DC servo motors very often come in for repair because their brushes have worn out. This seems like a straightforward problem with an easy solution; install new brushes! And while this could be true, premature brush wear can be a sign of larger problems with your servo motor.

brush rigging that was replaced by our technician during the servo motor repair process

Contaminated Brush Rigging

Brush riggings can become contaminated with carbon and oils, causing the insulation around the brush holders to deteriorate and fail.

broken servo motor magnets in field frame that was replaced during the motor repair process

Broken Magnets in Field Frame

Broken or dislodged magnets will cause contamination, high vibration, or excessive heat during operation. As long as a magnet is not broken, we can re-epoxy it to the field frame and then re-magnetize it to meet factory BEMF specifications.

damaged servo motor armature that was replaced so the motor could be refurbished to "like new" condition

Burnt Armature

Armatures can fail for many reasons such as oil or coolant contamination, excessive load, or carbon buildup within the motor.

damaged servo motor power connectors that were replaced by our servo motor repair technician

Power Connectors

Connectors are what transfer power from the drive to the motor through cables, making them a common failure point. These connectors have pins and sockets that can relax over time, and cause a point of high resistance which will heat up and fail.

Servotech Refurbishes DC Servo Motors from These Manufacturers (& Many More!)

  • ABB
  • AEG
  • Allen-Bradley (AB)
  • Baldor
  • Baumuller
  • BBC
  • Bosch
  • Bridgeport
  • Cincinnati Milacron
  • Cleveland Motor
  • Electrocraft
  • Fanuc
  • General Electric
  • Getty’s
  • Giddings and Lewis
  • Glentek
  • Goulds
  • Indramat
  • Inland
  • Kollmorgen
  • Matsushita
  • Mitsubishi
  • Pacific-Scientific (Pac-Sci)
  • Peerless
  • Peerless-Winsmith
  • Porter-Peerless
  • Powertron
  • Reliance
  • SEM
  • Siemens
  • Sinano
  • Tamagawa
  • Toshiba
  • Yaskawa