Hybrid ventilation cooling system and method for permanent magnet traction motor

Abstract

The invention relates to a hybrid ventilation cooling system and method for a permanent magnet traction motor. The cooling system is composed of an independently driven radial ventilation cooling system and an axial ventilation cooling system. The radial ventilation cooling system directly blows and cools the rotor and the permanent magnet. The end winding is cooled by the axial ventilation cooling system to balance the temperature rise of the whole machine. The invention separates the radial ventilation and the axial ventilation in terms of mass transmission, so that the wind resistance loss of the ventilation system is small; the two sets of ventilation systems respectively cool the position where the heat is relatively serious in the motor, and the cooling performance is excellent. The radial ventilation cooling system is divided into two parts: the air inlet channel and the air outlet channel by the separation partition. The temperature rise of the cooling gas entering each radial ventilation hole is similar, which ensures the balance of the temperature rise of the motor in the axial direction; the axial ventilation cooling The system ensures the uniformity of the temperature rise of the motor in the circumferential direction. The invention has the characteristics of good internal cooling effect of the motor and good temperature rise balance of the motor, and is suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical field of motor manufacturing, mainly to a motor cooling system, in particular to a cooling system for a permanent magnet traction motor of small and medium-sized rail transit, public transportation, and electric vehicles, specifically to a cooling system with two sets of axial and radial ventilation paths. A permanent magnet traction motor cooling system and method. Background technique [0002] Permanent magnet motors have the characteristics of high efficiency and high power density, and can maintain high efficiency and power factor under light-load operation conditions. Compared with asynchronous motors as traction motors, they can effectively save energy in the long-term operation of electric vehicles. . Since the electric vehicle motor is controlled by a frequency converter and the operating frequency is often high, there are a large number of space harmonics and time harmonics in the motor rotor and permane...

AI Technical Summary

Problems solved by technology

In addition, due to the needs of the installation process and production process, there is a large gap between the permanent magnet and the installation slot opened in the rotor core, which affects the heat transfer of the permanent magnet.

The indirect cooling efficiency of the traditional permanent magnet motor axial ventilation system for the permanent magnet is low, and it is difficult to guarantee its heat dissipation capacity

However, in the mixed ventilation structure of asynchronous motors in the past, the radial air path and the axial air path are cross-linked, and the wind resistance loss of small and medium-sized traction motors is relatively large, which limits the efficiency of the motor.

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