The invention belongs to the field of crane control, and particularly relates to a control method for a constant-moment-arm crane taking a vector variable-voltage variable-frequency frequency converter as a power supply. The control method comprises: measuring the output direct-current power and the output frequency of the frequency converter after a lifting variable frequency motor is started and is stable; indirectly measuring the torque of a lifting weight load; taking the torque and the rated power of the lifting motor as limited conditions to obtain the maximum operation frequency of the lifting motor; and determining the operation frequency of the lifting motor via speed control shifts. According to the invention, the crane system not only can work in a rated torque, but also can work in a rated power, so that double purposes of safety assurance and improved frequency are achieved. According to the invention, inner parameters of the frequency converter are measured; a sensor in a conventional crane system is omitted; the measurement accuracy is improved; and the system complexity and cost are reduced. The crane system is simple, accurate, high-efficient, and reliable.
Control method for constant-moment-arm crane taking vector variable-voltage variable-frequency frequency converter as power supply
2015-07-08
Patent
Electronic Resource
English
IPC: | B66C Krane , CRANES |
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