An oil-immersed high specific power permanent magnet brushless DC motor

Abstract

The invention relates to a permanent brushless direct current motor, in particular to an oil immersion type high specific power permanent magnet brushless direct current motor. The oil immersion type high specific power permanent magnet brushless direct current motor comprises a rotor, a stator sleeved on the rotor, a shell body arranged outside the stator and an end cap. A cylinder body provided with a radial protruding portion is arranged in the external circle of the external part of the rotor along the radial direction, a plurality of radial grooves are reversed in the radial protruding portion along the circumferential direction, the stator is in interference fit with the shell body and is fixed with the shell body, and a clearance is reversed between the stator and the rotor, and the rotor and the stator are matched in a sleeved mode. One end of the shell body is a full opening end, the other end of the shell body is a cylindrical structure provided with a through hole end, a protruding platform is arranged on the lower side of the shell body along the radial direction of the shell body, a channel communicated with the inner surface of the shell body is arranged at the position, near the full opening end of the shell body, of the protruding platform, and the channel extends from the inner surface of the shell body to the middle of the sectional face of the protruding platform. An oil path channel is arranged inside the protruding platform from the middle of the sectional face of the protruding platform to the direction far away from the full opening end of the shell body, and the oil path extends outside the shell body. The oil immersion type high specific power permanent magnet brushless direct current motor is simple in structure, reliable in operation, and high in specific power.

Description

Technical field [0001] The invention relates to a permanent magnet brushless DC motor, in particular to an oil-immersed high specific power permanent magnet brushless DC motor. Background technique [0002] Permanent magnet brushless DC motor is an electromechanical energy conversion device that uses permanent magnet excitation and electronic commutation instead of mechanical commutation. Therefore, permanent magnet brushless DC motors not only have good control characteristics of general DC motors, but also have simple structure, small size, light weight, no reversing sparks, high reliability, long working life, and strong ability to adapt to low-pressure environments. Series of advantages, widely used in industrial fields. [0003] In the traditional electro-hydraulic servo mechanism system, a high-speed motor is used to drive a hydraulic pump to provide hydraulic energy. This kind of structure requires that the oil pump must be designed with a rotary dynamic seal, and the hydr...

AI Technical Summary

Problems solved by technology

The traditional shielded motor adopts a shielded sleeve structure to allow oil or other liquids to enter the motor. This structure increases the air gap of the motor and cannot achieve small volume and high specific power requirements. Generally, it is only suitable for operating occasions that do not exceed 3000r / min , unable to meet the requirements of high-speed operation

It can be seen that both traditional products and shielded motor technology cannot meet the requirements of oil-immersed, high specific power, and small-volume motors in some fields. Therefore, new technologies need to be used to solve the problem.

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