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We describe the development of a permanent-magnet (PM) brushless DC motor for driving high-speed embroidery machines by employing advanced design and analysis techniques. In the design of the motor, magnetic field finite-element analyses accurately calculate the key motor parameters such as the air-gap flux, back electromotive force (EMF), and inductance. Using the numerical magnetic field solutions, a modified incremental energy method calculates the self and mutual inductances of the stator windings. A phasor diagram is derived to compute the motor's steady-state characteristics. To predict the dynamic performance and increase the prediction accuracy, a Simulink-based model simulates the motor performance with the real waveforms of applied phase voltage, back EMF, and current. The motor prototype tested with both a dynamometer and a high-speed embroidery machine validated the theoretical calculations. jack stitching machine in chennai, perambur, mylapore, madipakkam
This paper describes an automated sewing cell de-veloped for joining parts with different shapes usingtwo individually controlled robots. The specific casepresented involves the joining of four leather partswhich make up the footstool cover shown in Fig. 1. Atthe same time it is an important goal for the researchwork to develop flexible solutions capable of handlingdifferent part geometries and material properties. Thechosen cell design uses two lightweight robot armswhich can control two parts individually. This enablesthe system to sew parts with different geometry, re-sulting in 3D shaped assemblies. Force measurementsare used to control the tension in the parts and edgemeasurements are used to control the seam positionrelative to the edges of the parts. The controller systemhas no prior knowledge of the shape of the parts. Themain focus in this paper is verification of the controlframework and measurements of the force and edgeerror during the sewing process.
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