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Self-Commissioning speed and position control for electrical Drives with identification of mechanical load

Objective



In Europe, especially in Germany and Italy a large number of machines are produced, yielding a high percentage of the worlds production in textile (30%, 12BECU), packaging (44%, 13BECU), paper processing (45%, 2.5BECU) printing (37%, 7.3BECU) and rubber and plastic extrusion machines (40%, 7BECU) according to VDMA data of 1995 [1]. However, the market shares are descending due to the more cost-effective production schemes in the US and Japan. Many of these machines are equipped with electrical drives, and the proposing SMEs of the consortium supply drive systems or components for the machine producing sectors cited above. Due to increasing requirements on productivity and thus on machine utilisation, the dynamic performance requirements are enhanced. However, the mechanical transfer elements and the working machines to be controlled feature some kinds of mechanical imperfectness, which have to be considered with raised dynamic performance. To account for this imperfections is an involved task, as the structure modelling and the adequate controller design become very complex. To facilitate the commissioning of electrical drive systems with advanced control methods, self-commissioning of the control system is the logical solution. Since the capability to reorganise or adapt production schemes, taking into account the constraints of flexibility, speed, quality, safety and cost-effectiveness imposed by market conditions, decides about the future competitiveness of European industries, the development of software tools for the self-commissioning of speed and position control of electrical drives loaded by unknown mechanical systems (here: stiff or elastic 2-mass systems) with unknown mechanical imperfections (here: friction, backlash) and varying inertia is the main objective for the SME members of the proposing consortium. This objective divided into several items, ordered with falling priority for the SME group are: -Ex pansre, by increased adaptability to to new applications, market requirements and new production system configurations of customers, yielding a broader spectrum of customers. - Reduction of commission time and expertism of the commissioning personell, thus the associated costs, which overtake sometimes the costs of the drive itself. - Feasibility to use powerful controllers and select controller structure and parameters with respect to the previous identified mechanical load in order to obtain higher dynamic and stationary short- and long-term accuracy. - Use of lower-cost, lighter machinery and drives, saving raw material, energy for production, transportation, and operation energy of the plants, when accounting for mechanical imperfections instead of attempting to eliminate them by mechanical measures like stiff, rigid (thus heavy) constructions. The scope and objectives of the Brite/EuRam IV programme which comply with this proposal are: l.l.lS 1.1.7M.

Call for proposal

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Coordinator

Lust Antriebstechnik GmbH
Address
5-9,gewerbestraße 5-9
35633 Lahau
Germany

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EU contribution
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Participants (7)