German Axmann shaft, Axmann model, Axmann price

The Axmann shaft is a shaft with very low rigidity and elasticity, allowing free bending for transmission. It is used to connect two shafts with different axes, not in the same direction, or with relative motion to transmit rotational motion and torque. It can flexibly transmit rotational motion and torque to any position. It consists of a wire bundle with 4 to 5 layers of steel wire spirally wound on a central steel wire, with adjacent layers having opposite lay directions. It has a structure similar to single-strand steel wire rope, but with a very small lay pitch and a very large lay angle, and the outer layer of wires is mostly right-hand lay.

Axmann shaft applications

Flexible shafts are named after their use. In mechanical design, they are used as transmission components for non-linear transmission or transmission between non-coplanar planes. They can simplify transmission machinery while offering high transmission accuracy. They are widely used in various sectors, such as concrete vibrators, pneumatic picks, marine water pumps, medical instruments, machine tool transmission devices, and automotive odometers, all of which can be driven by flexible shafts. Additionally, flexible shafts can cushion shocks.

Axmann shaft control

Shafts typically employ variable frequency speed regulation methods. There are mainly three control methods: ordinary variable frequency drive and control, vector control drive and control, and direct torque control. Ordinary variable frequency drive is scalar drive and control, characterized by constant torque drive, with output power proportional to speed. The dynamic performance of ordinary variable frequency control is not ideal; control performance is poor at low speeds, output power is unstable, and it does not possess C shaft functionality. However, it is inexpensive and has a simple structure, generally used for grinders and ordinary high-speed milling machines. Vector control technology mimics DC motor control, using rotor field orientation and vector transformation methods to achieve drive and control, offering good dynamic performance. Vector control drives provide high torque at startup. Combined with the simple structure and low inertia of the electric spindle itself, this results in high starting acceleration, allowing instantaneous attainment of the permissible limit speed after startup. These drives come in open-loop and closed-loop variants. The latter enables position and speed feedback, offering better dynamic performance and C shaft functionality; the former has slightly inferior dynamic performance and lacks C shaft functionality but is less expensive. Direct torque control is another new type of high-performance AC speed control technology developed after vector control technology. Its control concept is novel, and the system structure is concise and clear, making it more suitable for driving high-speed electric spindles. It better meets the dynamic and static characteristic requirements of high-speed electric spindles, such as high speed, wide speed regulation range, and instantaneous precise stopping at high speed, and has become a hotspot technology in the field of AC drives.

Axmann shaft structure

Structural design of the shaft is an important step in shaft design, determining the reasonable shape and all structural dimensions. It depends on the type, size, and position of parts installed on the shaft, the fixing method of parts, the nature, direction, magnitude, and distribution of loads, the type and size of bearings, the shaft blank, manufacturing and assembly processes, installation and transportation, and factors such as shaft deformation. Designers can design according to the specific requirements of the shaft, and if necessary, compare several schemes to select the design scheme. The following are general principles for shaft structural design: 1. Save material, reduce weight, and adopt shapes with equal strength dimensions or large section modulus cross-sections as much as possible; 2. Facilitate precise positioning, stability, assembly, disassembly, and adjustment of parts on the shaft; 3. Adopt various structural measures to reduce stress concentration and increase strength; 4. Facilitate machining and manufacturing and ensure precision.

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