Conference Paper

Development of bar code scanner application for Windows Mobile devices using a Symbol Mobility Developer Kit for .NET Compact Framework

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Abstract

The problem we would like to discuss and solve is based on a remote controlling of created packages containing predefined components with a predefined numbers of these components. In principle the problem acts as a check out control problem. By the help of mobile device with integrated bar code scanner an application for such mobile device can be developed as a remote client of server, which contains a database with predefined properties, numbers of packages, etc. A web services and mobile client application was created using a Microsoft Visual Studio 2008.

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The limitation of the commonly used back-emf sensorless detection technique is that it is not possible to control the speed of the BLDC motor over a wide speed range as required in electric vehicles. In particular, it is not possible to control at low speeds due to the presence of noise signals near pulse width modulated (PWM) back-emf zero-crossing points at low speeds. Therefore, the duty-cycle of direct sensorless back-emf technique is limited to less than 100% since a minimum turn-off time is required to get the sample of back-emf and apply control action. In this paper, a microcontroller-based enhanced PWM back-emf zero-crossing detection method is proposed to control the speed of the BLDC motor over a wide speed range. The experimental results are presented in this paper for validation.
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