German OTT-JAKOB shaft, OTT-JAKOB model, OTT-JAKOB price

OTT-JAKOB shaft refers to a shaft whose operating speed is higher than the first critical speed and lower than the second critical speed. There are also shafts with speeds higher than the second critical speed. To reduce vibration, this type of shaft should be used when high operating speeds are required. A safety margin must be considered during design; generally, the operating speed is controlled to be >1.3 times the first critical speed, and<70% of the second critical speed. When accelerating a flexible shaft, it must reach and pass through the first critical speed. Due to the presence of various damping factors such as the surrounding medium, support bearings, and internal material friction, if the speed increases rapidly, the shaft deflection does not have time to reach its maximum before quickly exceeding the first critical speed, causing the operation to tend towards balance.

OTT-JAKOB shaft introduction

A flexible shaft is a device used to transmit rotational motion between two objects that are not fixed relative to each other. It consists of wire rope or coils. Flexible shafts are pliable but possess a certain torsional stiffness. They may have no covering, allowing them to bend but not rotate independently. They can transmit considerable power or only motion with very low power. Flexible shafts are commonly used in plumber's snakes. They are frequent accessories for handheld rotary tools and integral components of rotary tools with remote motors, known as "flexible shaft tools." Flexible shaft tools are often used in dentistry, the jewelry industry, and other industrial applications.

OTT-JAKOB shaft control

Shafts typically use variable frequency speed regulation methods. The main control methods include standard variable frequency drive and control, vector control drive and control, and direct torque control. Standard variable frequency drive is scalar drive and control, characterized by constant torque drive, where output power is proportional to speed. The dynamic performance of standard 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 standard 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 allows for high starting acceleration, achieving the allowable limit speed instantly after startup. These drives come in open-loop and closed-loop variants. The latter provides position and speed feedback, offering better dynamic performance and enabling C shaft functionality. The former has slightly inferior dynamic performance and lacks C shaft functionality but is cheaper. Direct torque control is a new high-performance AC speed control technology developed after vector control. Its control concept is novel, and the system structure is concise and clear. It is more suitable for driving high-speed electric spindles, better meeting the dynamic and static requirements of high speed, wide speed regulation range, and instantaneous precise stopping at high speeds. It has become a hotspot technology in the field of AC drives.

OTT-JAKOB shaft structure

Structural design of the shaft determines the reasonable shape and all structural dimensions, which is an important step in shaft design. It depends on the types, sizes, and positions of parts installed on the shaft, part fixation methods, the nature, direction, magnitude, and distribution of loads, bearing types and sizes, shaft blank, manufacturing and assembly processes, installation and transportation, and factors affecting shaft deformation. Designers can design according to specific shaft requirements, comparing several schemes if necessary to select the optimal design. The following are general principles for shaft structural design: 1, save material, reduce weight, and adopt equal-strength outer dimensions or cross-sectional shapes with large section moduli; 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 while ensuring precision.

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