Magnetic unit, its magnetic array, motor, servo device and driving device

Abstract

The invention provides a magnetic group unit, a magnetic array, a motor, a servo device and a driving device. The magnetic group unit includes a main magnetic source and as auxiliary magnetic sources a first auxiliary magnetic source, a second auxiliary magnetic source, a third auxiliary magnetic source, and a fourth auxiliary magnetic source. The first auxiliary magnetic source, the third auxiliary magnetic source, the second auxiliary magnetic source and the fourth auxiliary magnetic source are sequentially arranged along the circumferential direction of the main magnetic source. The first auxiliary magnetic source and the second auxiliary magnetic source are distributed on both sides of the main magnetic source along the width direction of the main magnetic source, and the third auxiliary magnetic source and the fourth auxiliary magnetic source are distributed on both sides of the main magnetic source along the length direction of the main magnetic source. side. The magnetization direction of the magnetic group unit is generally set along the direction perpendicular to the working surface of the main magnetic source, and the magnetization direction of the auxiliary magnetic source converges or diverges along the magnetization direction of the main magnetic source. It can be seen from the above scheme that by arranging the auxiliary magnetic source along the circumferential direction of the main magnetic source, it is beneficial to improve the magnetic concentration effect of the main magnetic source and increase the uniformity of the magnetic field intensity on the working surface of the main magnetic source.

Description

technical field [0001] The invention relates to a magnetic group unit, its magnetic array, a motor, a servo device and a driving device. Background technique [0002] The motor is generally composed of a stator, a rotor, a bearing, a casing, and an end cover. The rotor of a traditional brushless DC motor is composed of permanent magnets with a certain number of pole pairs embedded on the surface of the iron core or embedded inside the iron core. Permanent magnets are mostly made of rare earth permanent magnet materials with high coercive force and high permeable magnetic induction density such as NdFeB. The role of the permanent magnets of this rotor is similar to that of the permanent magnets used in brushed motors, both of which establish a sufficient magnetic field in the air gap of the motor. The difference is that the permanent magnets in the brushless DC motor are installed in the rotor. above. [0003] In traditional motors, the magnetic array composed of permanent...

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Problems solved by technology

[0003] In traditional motors, the magnetic array composed of permanent magnets lacks self-shielding and has serious magnetic flux leakage, which reduces the output power of the motor

Moreover, the surface magnetic density of the magnet is low, the utilization rate of the magnet is low, and the working efficiency of the motor is reduced

There is also a low sine of the air gap flux density, which affects the stability of the motor rotation

Compared with traditional motors, the magnet utilization rate of the Halbach array motor has been improved, but the magnet amount of the Halbach magnetic array is large, which increases the weight of the motor, and the magnetic field strength on the surface of the magnet is not uniform, and the magnetic field strength in the middle of the magnet is insufficient. , affecting the output power of the motor

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