What is the normal temperature range for new energy vehicle motors?
2 Answers
Under rated load conditions, the normal casing temperature of a new energy vehicle motor is approximately 60-70°C. Temperatures exceeding 60-70°C are considered abnormal and can cause damage to the motor. The insulation on the motor's enameled wire may melt, leading to short circuits, while high temperatures can cause permanent magnets to lose their magnetic properties, resulting in motor failure. If the motor frequently overheats beyond the normal temperature range, timely maintenance is required. The primary cause of overheating is internal motor faults. Common causes of internal motor faults include bearing issues and stator deformation. Bearings support rotational speed; once the ball bearing clearance increases, it can cause internal motor scraping, where the stator rubs against the rotor, increasing friction and generating excessive heat. The solution is to replace the bearings with high-quality ones. Some motor manufacturers use low-rigidity stators to reduce costs, which are prone to deformation. When the stator deforms, it deviates from its normal path, leading to uneven force distribution and increased temperature. The solution is to replace the stator with a more rigid one. When the power supply voltage is too high, the motor's back electromotive force, magnetic flux, and flux density all increase. Since iron losses are proportional to the square of the flux density, higher flux density leads to increased iron losses, causing the core to overheat. Additionally, increased magnetic flux results in a sharp rise in the excitation current component, increasing copper losses in the stator windings and causing them to overheat. Therefore, when the power supply voltage exceeds the motor's rated voltage, the motor will overheat.
The normal operating temperature of a new energy vehicle's motor typically ranges between 80 to 100 degrees Celsius, with a maximum limit of 110 degrees. If it exceeds this range, attention is required. I believe this temperature is crucial for efficiency. Motors generate heat during operation, but the design ensures it's kept at a safe, non-scalding level through the cooling system. While driving, the dashboard displays the temperature, with the green zone indicating normal operation. Factors affecting temperature include driving mode, speed, and external environmental temperature—summer heat can cause quicker temperature rises. It's best to develop a habit of checking coolant levels before long trips to avoid overheating risks. In most cases, the temperature remains stable, but if an alarm sounds, it's essential to stop and let the motor cool down. Remember to consult the vehicle manual, as specifications may vary slightly between models.
