DC Motor India

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    DC Motor India - Presentation Transcript

    1. 1 Comparison of Motors and Drives Direct current drives have several advantages of over AC drives: • DC drives utilize a much simpler controller design • One power conversion stage and no power storage elements (capacitors) • DC Drive has higher controller efficiency • Direct current drives are typically 98% efficient DC Drives benefit from high controller reliability and low maintenance due to a lone power conversion module. Other advantages of DC motors include lower power line harmonic contribution. DC Drives advantages • Need smaller line reactors • Have compact controller design • Have better overload and peak voltage characteristics • Have low motor acoustical noise (AC drives have carrier noise) • Easier troubleshooting and serviceability AC Motors advantages • No carbon brushes to replace • No commutator to clean • Low rotor inertia compared to the DC armature • Up to 50 hp lower cost than DC Motors The low initial cost of AC motors looks attractive in the short run; it becomes costly to maintain because of unreliable power supply available in India. Carbon brush replacement works out 70% cheaper than costly AC drive module replacement. Ramson & Ramson, 13 Ramgopal Ind Est, Dr RP Road, Mulund( West) , Mumbai-80 Email: ramson.ramson@gmail.com , ramson@mail.com , Tel: 91 22 25617729
    2. 2 Suitable Applications for DC motors and DC Drives Winders/Coilers: Figure 1 DC motors offer superior characteristics at low speed for winder and coiler operation and performance in winder applications maintaining tension at standstill is a very important operation. DC motors offer a wide speed range at rated torque. On many winder applications that run in an extended speed range a smaller horsepower DC motor could run the same job as a larger horsepower AC motor. Extruding: Figure 2 Extrusion is a price competitive industry. DC drives offers economical solutions for Extrusion applications. References http://www.scribd.com/doc/6358001/Basics-Of-DC-Drives (23 Nov 2008) Pharmaceutical Extrusion Technology By Isaac Ghebre-Sellassie, Charles Martin (page 375) Ramson & Ramson, 13 Ramgopal Ind Est, Dr RP Road, Mulund( West) , Mumbai-80 Email: ramson.ramson@gmail.com , ramson@mail.com , Tel: 91 22 25617729

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