Modular control
Control system with a modular structure in terms of hardware and software, making it more easily adaptable to variable conditions. Opposite: control with a rigid structure.
Wheel motor
cardan shaft and differential gear. In addition, either high speed motors with a reducing gear; either conventional hydraulic motors with connected reducing gears are used or designs, in which the hydraulic [...] also be adjustable – is integrated into the gear such that the torque is transferred over a ring gear with teeth on the inside, onto which the rim is directly welded ( Figure R 7 ). Slow speed high torque
Tachogenerator
rotation speeds. Disadvantage: The collector with brushes requires regular maintenance. AC generator : A rotor equipped with a permanent magnet turns within a stator with an electromagnet. In doing so, a sinusoidal
SAE flange
In hydraulics, four-hole flanges with the connection pattern standardised in SAE j 518 ( Figure S 1 ) are the most commonly used flange connections . The American SAE norm specifies two pressure stages [...] stages 3,000/6,000 PSI (210/420 bar), nominal widths of 15 to 50 and fastening screws with UNC threads. The SAE flange can be used as a two-part flange to connect pipelines to non-split counterfaces or as a [...] ISO 6162 includes both flanges for metric fastening screws (series I) and those for fastening screws with UNC threads (series II).
Slow speed high torque motor
deliver a torque level in keeping with the speed (up to 100,000 Nm and more). Slow speed high torque motors, despite their relatively large size, are associated with very low inertia torque, very good [...] good starting performance and very high efficiency ( Figure L 7 ). Alternative: high speed motor with transmission.
Initial pressure difference ΔpA of filters
information on the dirt holding capacity of a filter is necessary, as a filter with a low ΔpA can clog quicker than a filter with a higher ΔpA (see filter life ). [...] the magnitude of the flow rate flowing through the filter. The dirt holding capacity of a filter and with it the pressure difference of a filter have upper limits. Both are higher the smaller the initial
Magnetic filter
Filter with a permanent magnetic element for retaining ferromagnetic particles. Magnetic filters are often combined with fleece or screen filters and thereby increase the amount of contamination they retain
Safety of a system
are made, namely: "special information on technical values and measures, compliance with which – in the interaction with other technical measures –– should ensure that by keeping within the tolerable risk [...] safety measures and strictly comply with his obligations in terms of the regulations. In hydraulic systems : Due to the compressibility of the medium in connection with the high pressure, this means that [...] safety measures also serve to increase reliability ( Figure S 55 ). In this context, in accordance with DIN 31 004 "Safety is a situation, in which the residual risk of a failure is smaller than the tolerable
Laplace transformation
used, into algebraic operations with associated frequency functions. Laplace transformation is mainly used to solve differential equations in control technology. With Laplace transformation, a function [...] Laplace transformation is a method for solving linear differential equations with constant coefficients based on given initial conditions. It can also be used for fault functions which give the value zero
Contamination of the hydraulic fluid
surfaces. Therefore, hydraulic fluids must be filtered. Contamination with foreign liquids occurs through the entry of water, mixing with other hydraulic fluids or lubricants. The contamination may already [...] a hydraulic system. It can be caused by solid particles and/or dissolved foreign matter, by mixing with foreign liquids, or by air entering the hydraulic fluid. The solid particles may be hard or soft.