Slotless motor with low cogging torque and torque ripple formed by magnetically conductive magnet wires

Abstract

The invention relates to a magnetic-conductive electromagnetic wire and a magnetic-conductive-electromagnetic-wire-contained slotless electric machine with low cogging torque and torque pulsation. The magnetic-conductive electromagnetic wire comprises a first insulation layer, a conducting layer, and a magnetic conduction layer. The first insulation layer has an annular structure. The conducting layer made of a copper material is arranged in the first insulation layer; and the cross section of the conducting layer has an annular structure. The magnetic conduction layer arranged in the conducting layer employs a cylindrical structure. The thickness of the first insulation layer is decided by an insulating layer and a working voltage; and the thickness of the conducting layer and the diameter of the magnetic conduction layer are set according to demands. A stator winding of a slotless electric machine is formed by magnetic-conductive electromagnetic wires; a coil of each turn is formed by a first coil side, a second coil side, a first end portion lead, and a second end portion lead; one end of the first coil side and one end of the second coil side are connected by the first end portion lead and the other ends are connected by the second end portion lead; and the first coil side and the second coil side employ the magnetic-conductive electromagnetic wire. Therefore, the number of used permanent magents of the slotless electric machine as well as an exciting current of a slotless asynchronous motor is reduced; the costs are lowered; and the performances are improved.

Description

technical field [0001] The invention relates to an electromagnetic wire and a slotless motor, in particular to a magnetically conductive electromagnetic wire and a slotless motor with low cogging torque and low torque ripple formed by the magnetically conductive electromagnetic wire. Background technique [0002] Modern society cannot do without motors, and motors are used in transportation, industrial and agricultural production, information processing, and various fields of daily life. There are many types of motors with different structures, such as asynchronous motors, permanent magnet motors, electric excitation motors, etc. Some precision applications have high requirements on the torque smoothness of the motor, as well as high requirements on the vibration and noise of the motor. The iron core of ordinary motors is slotted, and the windings are arranged in the slots. Slots change the air gap permeability of the motor, which causes cogging torque that exists even in n...

AI Technical Summary

Problems solved by technology

However, the existing slotless motors are all used in micro motors and small servo motors. The reason is that after using slotless windings, the equivalent air gap of the motor increases, the air gap flux density of the motor decreases, and the magnetic load decreases. Directly reduce the torque density and power density of the motor; in addition, in order to maintain the air gap flux density, it is necessary to increase the excitation magnetomotive force. For permanent magnet motors, it will increase the amount of permanent magnet materials used in permanent magnet motors, greatly improving the The cost of the asynchronous motor; for asynchronous motors, the excitation current is greatly increased, resulting in a substantial drop in the power factor of the asynchronous motor, and the actual performance of the slotless asynchronous motor is poor

It can be seen that so far, the use of slotless motors is still limited and restricted.

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