The Yaskawa SGMP‑03B3DN11 is a 100 V AC servo motor rated at 300 W and 4.3 A, typically used in precision motion control applications such as CNC tooling or robotic positioning. Common failure modes for this class of motors include insulation breakdown leading to shorted windings, bearing wear causing increased vibration and heat, and loss of encoder feedback due to cable damage or connector corrosion. Initial checks should verify that the motor receives proper line voltage and phase balance, inspect all wiring harnesses for fraying or loose connections, and confirm that the encoder signal is present and within spec; if available, review any error codes from the associated Yaskawa drive for indications of winding faults or mechanical overload.[oss-gpt-20b]