Electromagnet and switchboard for slewing crane

• Autor(es): Pedrosa, Delfim ; Teixeira, Patrício ; Esteves, João Sena
• Data: 2006
• Identificador Persistente: http://hdl.handle.net/1822/6076
• Origem: RepositóriUM - Universidade do Minho
• Assunto(s): Electromagnet; Switchboard; Contactor; Inverter; 8051 microcontroller
• Tipo de Documento: Documento de conferência
• Idioma: Inglês

Descrição

This paper presents an electromagnet and a switchboard used on a science fair slewing crane described in a separate paper. The electromagnet can lift 50kg loads. The switchboard includes a transformer that powers the electromagnet. It also contains relays, contactors and inverters that allow the operation of the crane three-phase motors using a single-phase power supply. Crane slewing is limited to an 180º angle, for safety reasons. Pressing an emergency button switches off all command circuits. An 8051 microcontroller-based system determines the vertical position of the electromagnet, which cannot be switched off while being on a high position, not even if the emergency button is pressed.