High temperature test of high efficiency brushless motor

High-efficiency brushless motors have complex heat generation reasons, including stator copper loss, stator iron loss, rotor iron loss, and mechanical loss. Excessive heating will cause local magnetic loss of magnets, local overheating of iron cores and other factors that affect safety, so thermal simulation analysis and research must be carried out. According to the simulation results, the structure of the motor is optimized, the heat dissipation capacity of the motor is improved, and local overheating is avoided. This is of great significance for extending the life of the motor, improving the reliability of the motor, and reducing the pressure of the cooling system.

The high-efficiency brushless motor and its drive component system, as the main power components, must maintain good drive control capabilities under different temperature, air pressure, and wind conditions. Taking a certain type of high-altitude aircraft propeller drive motor as an example, the motor and reducer are integrated to meet the requirements of the motor's high power density, and the motor's external structure and dimensions are reasonably designed.

The motor is a complex mechanical assembly composed of stator and rotor, casing, end cover, etc. Considering that parts with smaller mechanical dimensions have less influence on the motor temperature, it is simplified and ignored in the thermal simulation analysis to improve The efficiency of simulation analysis. This simulation simplifies the motor simulation model: ignoring parts such as screws and gaskets; ignoring chamfers, undercuts, etc.; ignoring the effect of radiation; equivalent treatment of stator windings and punching pieces, which are equivalent to Homogeneous materials.

High-efficiency brushless motor timing magnets, enameled wires, insulation materials, etc. are designed to operate at 150 ℃, leaving a design margin based on the calculated value, meeting the motor temperature rise requirements, and meeting the requirements of stable motor operation.

The heat dissipation performance of the motor provides effective simulation data for the stable operation of the motor in different environments, shortens the motor development cycle and reduces the cost of research and development.