Permanent magnet brushless moment motor with double stators

Abstract

The invention discloses a permanent magnet brushless moment motor with double stators, mainly comprising a rotor shaft, an inner stator core, an inner stator cup, an outer stator core, an outer stator cup, a rotor core, rotor inner magnetic steel and rotor outer magnetic steel, wherein the rotor inner magnetic steel and the rotor outer magnetic steel are in a structure with a thin middle part andtwo thick ends along the axial direction; the rotor inner magnetic steel, the rotor outer magnetic steel and the rotor core jointly form a rotor assembly arranged between the inner stator cup and theouter stator cup; the inner stator cup and the outer stator cup are respectively fixedly connected with the inner stator core and the outer stator core; and the inner stator core and the outer statorcore are connected to a main case through sleeves. The unequal thickness design of the rotor inner magnetic steel and the rotor outer magnetic steel in the invention compensates the influence of browleakage on axial air gap flux density distribution and ensures the uniform axial distribution of the air gap flux density; coils of an inner stator winding and an outer stator winding jointly form the coils of a motor winding, the serial connection turn number of windings of each phase is increased to ensure that the moment coefficient of a motor becomes large, thereby increasing the moment density and reducing the volume of the motor.

Description

technical field [0001] The invention relates to a permanent magnet brushless torque motor, especially a double-stator cogging-free torque motor with small torque ripple and high torque density, which belongs to the field of motors and is suitable for low power consumption and high torque occasions, especially for It is suitable for occasions that require high output torque density. Background technique [0002] At present, direct drive motors with high precision and high torque density have become a hot spot in the development of permanent magnet motors. It is important to increase the torque density of motors and reduce the torque ripple of permanent magnet motors. In the traditional permanent magnet brushless torque motor, due to the existence of the stator cogging, the cogging torque and tooth harmonics will be generated when the rotor rotates, which will cause the torque to pulsate and generate a certain loss, which will further affect the motor output. Torque accuracy ...

AI Technical Summary

Problems solved by technology

According to the calculation formula of torque motor output torque, on the basis of a certain axial length of the motor, the output torque is proportional to the air gap magnetic density, coil current and winding coil turns, and after using the coreless stator, the motor air The gap flux density and the number of winding turns are all limited, so that the output torque of the motor is reduced, the torque coefficient of the motor is reduced, and the volume and mass of the motor are larger when the same torque is output.

Due to the above defects, the existing permanent magnet brushless torque motors are difficult to meet the requirements of high precision and high torque density at the same time

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