Large-torque permanent magnet brushless motor stator and rotor structure with cooling water pipe

Abstract

The invention provides a large-torque permanent magnet brushless motor stator and rotor structure with a cooling water pipe. The large-torque permanent magnet brushless motor stator and rotor structure is formed by a rotor, a stator, coils, the cooling water pipe and permanent magnets. The rotor is formed by a rotor core body, a rotating shaft and a rotating shaft disc. The rotor core body is formed by superimposing silicon steel punching plates provided with magnetic steel slots, and is embedded in the rotating shaft disc; the rotating shaft is embedded in the center of the rotating shaft disc; and the permanent magnets are made of a neodymium iron boron magnetic material, are sintered into concentric-and-unequal-circle tile-shape column magnetic steel, which is embedded into the magnetic steel slots of the rotor core body, and are fixed through high-temperature-resistant resin. The stator is formed by a stator core body, the coils and the cooling water pipe. The stator core body is formed by superimposing silicon steel punching plates; the stator core body is provided with coil embedding slots; the coils are embedded in the coil embedding slots respectively; the circumference edge of the stator core body is provided with half-opening ring water pipe slots; and the cooling water pipe is wound in the water pipe slots in the stator core body in sequence. Through design of the distinctive stator and rotor and cooling structure, large-torque and large-power output can be realized.

Description

technical field [0001] The invention relates to a large-torque permanent-magnet brushless motor stator and rotor structure with a cooling water pipe, which is mainly used in high-torque, high-power permanent-magnet brushless motor automatic control equipment that adopts DC power supply. Background technique [0002] The permanent magnet brushless DC motor originated in the micro motor industry. The permanent magnet brushless DC motor is small in size, wide in speed variation range, simple in excitation, has good mechanical characteristics and adjustment characteristics, and has irreplaceable characteristics of other motors. However, the existing permanent magnet brushless DC motors also inherit many traditional practices in the micro motor industry, that is, the rotor yoke is usually processed from low carbon steel, and then the rotor is punched and laminated; the permanent magnets are often made by High temperature glue is pasted on the outer circumference of the rotor yo...

AI Technical Summary

Problems solved by technology

However, when the torque increases, the shear force on the rotor increases, the fatigue resistance of the permanent magnet as a component decreases, and the possibility of damage increases; on the other hand, when the temperature of the armature coil is higher than 150°C When the temperature is around 100°C, the temperature of the motor casing will rise to about 100°C, and when the temperature of the enameled wire is higher than 150°C, the paint film will fall off due to the high temperature, resulting in a short circuit in the internal circuit of the coil. temperature

More importantly, the demagnetization temperature of ordinary permanent magnet materials is 110°C, while the demagnetization temperature of NdFeB permanent magnet materials can reach 140°C. When the ambient temperature is higher than 150°C, NdFeB permanent magnet materials will Irreversible loss of more than 5%

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