What to Do When an Electric Vehicle Motor Overheats?
2 Answers
Electric vehicle motor overheating causes and solutions include: 1. Broken bars in the motor's squirrel-cage rotor or loose connections in the wound rotor coil, causing excessive maintenance current and heating. Copper bar rotors can be repaired by welding or replaced, while cast aluminum rotors should be replaced entirely. 2. If the voltage exceeds 10% above the motor's rated voltage or falls below 5% of the rated voltage, the motor is prone to overheating under rated load, leading to increased temperature rise. Voltage should be checked and adjusted. 3. Inter-turn or phase-to-phase short circuits or grounding in the stator winding increase current, leading to excessive losses and overheating. If the issue is minor, reinsulating may suffice; severe cases require winding replacement. 4. Damaged or excessively worn bearings causing the motor's stator and rotor to rub against each other. Check for loose bearings and poor alignment between stator and rotor.
I've encountered situations where the electric motor overheated while driving, and experience tells me it's dangerous if not addressed immediately. Once the dashboard warning light comes on or you notice the car becoming noisier, you must find a safe place to pull over right away—never push through and keep driving. After stopping, turn off the engine and let the motor cool naturally for at least ten minutes, using the air conditioning to assist with cooling if necessary. Common causes include insufficient coolant, fan malfunctions, or excessive load during traffic jams. Regular maintenance is key—check the cooling system and battery temperature frequently, and replace the coolant every six months to prevent issues. If the warning light keeps coming on, take the car to a professional repair shop immediately—don't attempt DIY fixes. Safety always comes first.
