Three-phase sealing structure of oil-cooled motor

Abstract

The invention discloses a three-phase sealing structure of an oil-cooled motor. The three-phase sealing structure comprises a generator, a speed reducer, the oil-cooled motor and a controller, wherein the generator and the oil-cooled motor are distributed on the two sides of the speed reducer, and the controller is arranged over the oil-cooled motor; the oil-cooled motor comprises a three-phase cover plate, an oil-cooled motor casing, a first three-phase buckle and a second three-phase buckle; the oil-cooled motor is connected and sealed through a three-phase cover plate, and the three-phase cover plate and the oil-cooled motor shell form a three-phase sealing structure; the first three-phase buckle is used for fixing a three-phase line to form a fixed path, and the second three-phase buckle is used for sealing a three-phase outgoing line. A three-phase line is led out from a motor stator winding, is fixed through a first three-phase buckle, is sealed through a second three-phase buckle and enters a three-phase chamber, and a three-phase line copper nose extends into the controller. The three-phase line and the copper nose are completely isolated, the risk of insulation failure of the motor is reduced, motor oil mist is prevented from entering the controller in a high-temperature environment, and the risk of failure of electrical components is reduced.

Description

technical field [0001] The invention belongs to the field of oil-cooled motors, and relates to a three-phase sealing structure of an oil-cooled motor. Background technique [0002] At present, drive motor technology is mainly developed towards high torque density and high power density. Efficient heat dissipation and cooling capabilities can increase the continuous power and continuous torque of the motor. The technical development trend of drive motors will inevitably require improved cooling efficiency. Among them, the development prospect of oil-cooled motors is better, because the oil itself is partially non-magnetic, non-flammable, non-conductive, and has good thermal conductivity, which has no effect on the magnetic circuit of the motor, so the heat dissipation efficiency is higher. In recent years, some domestic and foreign research institutions and Enterprises vigorously develop oil-cooled motors. [0003] However, oil-cooled motors bring new challenges to the insul...

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Problems solved by technology

[0003] However, oil-cooled motors bring new challenges to the insulation system

Since the insulation material of the motor will be in contact with AFT oil (chemical medium) for a long time under high and low temperature conditions, the insulation evaluation of oil-cooled motors needs to take into account not only traditional heat, electricity, environmental factors, etc., but also materials and systems and variable speed The compatibility problem of the tank oil may cause the insulation of the driving motor to fail early, and then lead to the failure of the motor insulation

Most of the oil-cooled motors on the market now have a three-phase connection structure. The three-phase wires of the motor and the copper bars of the controller are simply fastened together by fasteners. Although this solution achieves integration, there is a risk of insulation failure. The phase copper terminals, terminal blocks and fastening bolts are all exposed inside the motor and are not completely isolated from the oil. Although the oil is non-conductive, after the motor has been running for a long time, there will be conductive impurities such as iron filings in the oil. At the same time, the three-phase The long-term contact of the wire insulation material with oil will also cause the insulation failure of the motor; and the structure of the terminal block is complicated, and copper bars are embedded inside, which is complicated to make and has high processing precision. , the cost will be greatly increased; in addition, in the current scheme, the controller is inserted into the terminal block in the motor junction box through the three-phase copper bar assembly, and then the stator three-phase outlet is fixed on the three-phase copper bar assembly through fasteners. The structure is complex and involves many materials

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