The Primary Structure of a Low Eddy-current Loss Cogged Cylindrical Linear Motor

Abstract

The invention discloses a primary structure of a low eddy current loss cogging type cylindrical linear motor, which includes primary teeth, primary yokes and multiple circular ring groups; the primary teeth and primary yokes are separate components and are tightly fitted together , forming the primary iron core; one or more circular ring groups are embedded between each two primary tooth assemblies; the ring-shaped primary tooth assembly consists of multiple tooth core blocks of the same specification arranged in an array along the side length of an equilateral polygon Each core block is made of silicon steel sheets laminated along the circumferential direction; the primary yoke assembly is made of silicon steel sheets laminated along the motor moving direction, and each lamination is evenly opened with a number of shallow grooves in the yoke along the circumferential direction to prevent Break the eddy current path along this direction. The invention adopts the method of separating the teeth and yokes and laminating sheets in different directions to form the primary iron core, which can effectively reduce the eddy current loss of the cogged cylindrical linear motor, improve the efficiency of the motor, and at the same time maintain a high thrust density of the motor.

Description

technical field [0001] The invention relates to the field of motors, in particular to a primary structure of a low eddy current loss cogging type cylindrical linear motor. Background technique [0002] Compared with the traditional rotary-linear transmission mechanism, the linear motor system can directly provide linear thrust to the load without any mechanical conversion device, and has the characteristics of fast dynamic response and high reliability. Among the many topological structures of linear motors, the magnetic field of cylindrical permanent magnet synchronous linear motors is closed in the circumferential direction, the magnetic circuit has good symmetry, no lateral edge effect, simple structure, high force density, and good servo performance. much attention. Compared with the slotless cylindrical linear motor, the cogged linear motor can provide higher thrust density and transmission efficiency, but the primary of the cogged linear motor is a sleeve-type structu...

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Problems solved by technology

Compared with the slotless cylindrical linear motor, the cogged linear motor can provide higher thrust density and transmission efficiency, but the primary of the cogged linear motor is a sleeve-type structure, which will form a large eddy current, which greatly It affects the performance of the motor and limits the expansion of its application range. Therefore, reducing eddy current loss is very important for the practical application of cogged cylindrical linear motors

In the existing primary structure of a cylindrical linear motor (publication number: 111668946A), the primary iron core is spliced ​​in pieces, which has a good eddy current suppression effect, but at this time the primary yoke core is missing a lot, and the gap is too large Causes a drop in thrust density, resulting in inefficient use of electromagnetic energy

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