Oil-immersion cooling structure and cooling method for hub motor with dynamic adjustable oil quantity in cavity

Abstract

The invention provides an oil-immersion cooling structure for a hub motor with dynamic adjustable oil quantity in a cavity. The oil-immersion cooling structure comprises a motor shell, a stator coil mounted on the inner side of the motor shell, and a rotor mounted on the inner side of the motor shell and capable of rotating around the stator coil; a water cooling sleeve is mounted between the motor shell and the stator coil; an oil guiding cavity is formed between the stator coil and the rotor; the upper end and the lower end of the oil guiding cavity are connected to oil path outlets of a first reversing valve and a second reversing valve through oil guiding pipes respectively; oil path inlets of the first reversing valve and the second reversing valve are connected to an oil storage box through the oil guiding pipes; and the first reversing valve and the second reversing valve are connected through an oil pump. The invention also provides an oil-immersion cooling method for the hub motor with dynamic adjustable oil quantity in the cavity. Intelligent dynamic adjustment can be performed according to the operating working conditions of the motor, and heat dissipation requirement of the motor operation in all working conditions can be satisfied; and in addition, relatively high barrier to rotor operation caused by heat conducting oil in the heat dissipation process also can be avoided.

Description

technical field [0001] The invention belongs to the technical field of motor cooling, and in particular relates to an oil immersion cooling structure and cooling method with a dynamically adjustable oil volume in a wheel hub motor cavity. Background technique [0002] With the development of new energy electric vehicles and hybrid technology, compact and efficient in-wheel motor drive methods are gradually becoming popular. The pursuit of extreme vehicle power performance leads to higher and higher power in-wheel motors, so the waste heat generated by the motors increases accordingly (total 3%-5% of the power), if the waste heat cannot be effectively dissipated into the environment in time, it will cause the internal heat of the motor to accumulate and generate high temperature. If the internal temperature of the hub motor is too high, the insulation of the coil will be damaged, and the permanent magnet will be irreversibly demagnetized, etc. As a result, this will greatly r...

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Problems solved by technology

However, in this way, considering the resistance of oil to the rotation of the rotor, adding too much oil will affect the efficiency of the motor. Only a small amount of heat transfer oil can be added, and the oil will be thrown to the motor stator and shell by the rotation of the rotor to dissipate heat. The heat dissipation effect of the running motor is better, and the hub motor generates about 3 times the heat under the normal operating condition when the hub motor is running at a low speed or stalled at a climbing speed. At this time, the rotor rotates slowly or does not rotate, and heat transfer oil deposits At the bottom of the motor oil guide chamber, the heat dissipation effect of the heat conduction oil is very limited

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