This paper constructs a heat dissipation model that couples the motor structure with the characteristics of heat pipes. Combining experiments and simulations, this paper analyzes the impact of heat pipe lay-out on heat dissipation efficiency and quantitatively evaluates the energy efficiency optimization effect. A 150 kW permanent magnet synchronous motor and a 120 kW asynchronous induction motor were tested under different loads. After installing the heat pipes, the maximum temperature at 100% rated load dropped from 142.3-108.5°C for the permanent magnet synchronous motor, and from 138.7-105.2°C for the asynchronous motor, both reductions exceeded 30°C. Regarding energy consumption, the hourly power consumption at rated load dropped from 14.8-13.4 kWh for the permanent magnet synchronous motor, a 9.4% reduction, and from 15.2-13.9 kWh for the asynchronous motor, an 8.5% reduction. The simulation was conducted using ANSYS Workbench 2023 R2. The temperature field distribution shows that the high temperature zone has been reduced by over 60%, and the temperature gradient has dropped from 25°C per cm to 12°C per cm, with a deviation of less than 5% from experimental data. This research provides theoretical support for improving motor reliability and reducing vehicle energy consumption.