A Servo motor is a closed-loop electromechanical system that, unlike a standard asynchronous motor, can continuously control its own position, speed, and acceleration through feedback mechanisms. At the rear of a servo motor, there is an electronic reader called an Encoder or Resolver, which transmits the rotor's instantaneous position to the servo drive in milliseconds.
Thanks to this high technology, CNC machining centers can cut metal with micron-level precision, industrial robotic arms can perform flawless assembly tasks, and packaging machines can operate at high speeds with perfect synchronization.
Differences Between AC Servo and DC Servo Motors
Depending on the supply current and structural features, two main types of servos are used in factories and automation systems:
AC Servo Motors
They have a brushless structure. Since there are no carbon brushes, friction-related wear is minimal. They can reach very high speeds (6000+ RPM) stably. Because they dissipate heat easily from their body, they are today's industrial standard in heavy industry, CNC, and robotic lines (e.g., Siemens 1FK series).
DC Servo Motors
Due to their brushed structures, their carbons wear out over time and require periodic commutator maintenance. They are simpler to control than AC motors and provide rapid response. However, due to the risk of arcing at high speeds, they have largely been replaced by AC servos today.
Why Can't a Standard Rewinder Repair a Servo Motor?
The most costly mistake frequently made in the industry is handing over an expensive, faulty servo motor to a local standard electric motor rewinder. Servo motors are not just a pile of winding wire; they are the nervous systems of robots.
When a servo motor is disassembled for mechanical repair or rewinding, the encoder at the back is also removed. When reassembling, if the encoder's electrical zero point (Offset/Angle) is not set correctly with an oscilloscope, the motor will shoot in the reverse direction in the first second of operation or blow up the drive's IGBT modules on the panel, causing tens of thousands of liras in secondary damage. Servo repair is a well-equipped laboratory job.
Code Elektronik: Servo Motor Overhaul Stages
We don't deliver your faulty motor by just "patching" it. Every motor coming from your facility undergoes a comprehensive overhaul process to be restored to OEM (Original Equipment Manufacturer) standards:
1. Insulation (Megger) and Rotor Magnetic Field (Gauss) Measurements
Permanent Neodymium magnets on the rotors lose their magnetic fields (Gauss) as a result of overheating, causing the motor to lose power and draw excessive current. We measure magnetic field losses with our special devices and detect the short-circuit conditions (insulation weakness) of the stator windings with a 5000V Megger test.
2. High-Speed Bearing and Brake Repair
Spindle and Servo motors operate at high speeds. Ordinary bearings disintegrate at these speeds. We use only original SKF/FAG high-speed bearings. At the same time, we renew the electromagnetic brake pads used in the Z axis and restore their holding torques to factory values.
3. Encoder Calibration and Simulator Test
After the motor is assembled, the encoder's zero point is adjusted with an oscilloscope and manufacturer software (Siemens Sinamics, Fanuc, etc.). The motor is connected to drive simulators in our laboratory and tested for hours under real load. When it reaches your facility, it is ready to "Plug & Play".