Totally enclosed motor for achieving separate cooling of stator and rotor by dual-channel fan

Abstract

The invention discloses a totally enclosed motor for achieving separate cooling of a stator and a rotor by a dual-channel fan. The dual-channel fan 9 with a unique design is adopted and matched with a motor structure, so that a combined cooling mode of enclosed ventilation cooling of the stator and open ventilation cooling of the rotor of a three-phase asynchronous motor is achieved. By the combined cooling mode, the stator insulating reliability and the rotor cooling capacity are ensured; and the motor efficiency is improved. The dual-channel fan 9 can play roles of two fans, so that the motor structure is compact. Fan blades of the dual-channel fan are divided into two groups 9c and 9f, and are in staggered distribution in the circumference. Air ducts 5a, 10a, 3a, 9a, 9c, 9b and 6a form independent rotor cooling air ducts; the air ducts 6b, 9d, 9f, 9e and 2a form independent stator cooling air ducts; a convex edge 5b and a toothed plate 11 form a labyrinth seal; a fan excircle 9g and the convex edges 6d and 6e are in small-gap fit; and a stator space is isolated from a rotor space.

Description

technical field [0001] The present invention relates to a totally enclosed self-ventilated electric motor for industrial applications and for driving railway vehicles. Background technique [0002] The heat generated by the stator and the rotor of the three-phase asynchronous motor accounts for about half, and the heat generated by the stator of the industrial motor is slightly higher. Due to the large workload and the large slip of the rotor of the traction motor used for railway vehicles, the heat generated by the rotor will reach the total heat generated. more than half. [0003] The ventilation and cooling methods of three-phase asynchronous motors are usually divided into open type and closed type. [0004] 1. For the existing open motor: the external cooling air flows directly through the surface of the stator and rotor, taking away most of the heat, and the cooling effect is good. The disadvantage is that the stator coil insulation system is easily eroded by externa...

AI Technical Summary

Problems solved by technology

The filter and dust removal device needs to be disassembled and cleaned regularly, and the cycle is about 3 months, which consumes a lot of labor

[0009] 5. At present, low-floor trams are rapidly popularized in China, and the traction motors of trams are close to the road surface, which is easy to contact with rain and dust, so enclosed traction motors must be used; in order to increase the space for passengers and passages above the bogie, traction motors are required The volume is small enough; in order to meet the performance of greater slope passing performance and improve the braking energy recovery rate, the power of the traction motor is required to be large enough. These factors pose a huge challenge to the current design of traction motors

[0010] 6. The rotor of the three-phase asynchronous motor generates a lot of heat. Usually, the operating temperature of the rotor is 50 to 100 degrees higher than that of the stator. The heat of the rotor is easily transmitted to the bearing through the shaft. The high operating temperature of the bearing will reduce the performance of the grease and reduce the life of the bearing.

The excessive expansion of the inner ring of the bearing may cause the working clearance of the bearing to disappear, the bearing will be stuck and the motor will be burned

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