Linear motor

Hydraulic-drive samplers are also available, but cost factors tend to be substantially greater than electromechanical units. Recent use of hydraiilic-drive systems has diminished with the availability of increased strength and durabihty electric-motor linear-drive units capable of reliable operation in high-capacity applications. 

Axes drives Lead screw and servo motor Linear motor... 

Electric drives can carry out linear as well as circular movements. The latter are derived directly from the rotation of the electric motors. Linear movements are achieved with the aid of racks and pinions, crank drives or recirculating ball spindles, as well as linear motors. 

In Fig. 2.16, a close-up picture of the reactor with the capillary for temperature profiles is displayed. The FHS, the capillary inserted into one channel and the ceramic fiber paper covering FHS, catalyst, and BHS are visible. The setup can be used for in situ measurements, where axial temperature and concentration profiles can be detected from one channel of the monohthic catalyst. Figure 2.17 shows the micro volume tee mounted onto the motorized linear stage used for moving the capillary. The setup is similar to the one introduced for foam monoliths by Horn et al. (2006a,b) and then adapted to honeycomb monoliths by Donazzi et al. (2011a,b). A novel feature of our... 

Figure 2.17 Picture of the microvolume tee, with the connected capillary, mounted onto the miniature motorized linear stage (black part below). The thin yellow (gray shade in the print version) fiber coming out of the back of the capillary is the VIS-IR optical fiber.

Fig. 151. Minimal pathway of xlly with sensory and motor linear part and a minimal cyclical pathway of length 2ET (thick lines)...

Such as motors (not really but can be considered so being balanced loads) heating loads, capacitor and incandescent lighting loads etc. Of the linear loads, the following will require special consideration. 

Consider a vacuum interrupter having a dielectric strength of 50 kV at approximately 1.2 mm contact gap (Figure 19.1). Assuming the dielectric properties to be almost linear in this region, the contact gap, while switching a 6.0 kV motor for instance, will break down when the contacts are ... 

Where stray currents are involved, several measurements have to be taken that are continually changing with time, simultaneously with each other. A double recorder is most suitable for this. Linear recorders with direct indication of the measurements cannot be used for potential measurements because the torque of the mechanism is too small to overcome the friction of the pen on the paper. Amplified recorders or potentiometer recorders are used to record potentials. In amplified recorders, as in amplified voltmeters, the measured signal is converted into a load-independent impressed current and transmitted to the measuring mechanism, which consists of a torque motor with a preamplifier. The amplifier results in an... 

A major problem is the design of a propulsion system for a vehicle that has no contact with a guideway. The only reasonable choice is a linear motor that uses magnetic fields to propel the vehicle. The development of a linear motor and its control system is at least as formidable a challenge as the development of a maglev suspension system. 

There are four competing maglev technologies electromagnetic suspension, electrodynamic suspension, linear synchronous motor, and linear induction motor. 

Note that the popular press often misuses terms like induction and synchronous when applied to linear motors. 

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