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针对伺服压力机电机再生制动时产生的电能通过制动电阻转变为热能耗散掉的问题,在自主研发的2000 k N曲柄连杆伺服压力机基础上,设计并实现了1套电容储能系统,并给出其具体技术指标。系统采用日本尼吉康NY系列的铝电解电容,单个电容器的容量为12 m F,耐压为450 V,通过串并联的方式,250个电容器总容量为750 m F,总耐压为900 V。电容储能系统支持预充电、正常、过压放电、剩余能量释放4种工作状态,运行过程中充放电电压、电流和温度信号等参数接入采集模块,然后通过Profibus-DP现场总线与主控制器Simotion相连。实验结果表明:电容储能系统能量交换响应速度快,减小了压力机工作行程瞬时大电流对电网的冲击,降低了整流单元的容量要求,达到了系统设计技术指标。
Aiming at the problem that the regenerated braking power of servo press motor is transformed into heat dissipation through braking resistor, a set of capacitor storage energy is designed and realized based on self-developed 2000 k N crank connecting rod servo press System, and gives its specific technical indicators. The system uses Nyquist NY series aluminum electrolytic capacitors. The capacity of a single capacitor is 12 mF and the withstand voltage is 450 V. The total capacity of 250 capacitors is 750 mF in series-parallel connection, and the total withstand voltage is 900 V. Capacitor energy storage system supports pre-charge, normal, over-voltage discharge, the remaining energy release of four working conditions, the operation of charge and discharge voltage, current and temperature signals and other parameters access acquisition module, and then through the Profibus-DP fieldbus and the main control Simotion connected. The experimental results show that the energy exchange response of capacitive energy storage system is fast, which reduces the impact of instantaneous large current of the working stroke of the press on the power grid, reduces the capacity requirement of the rectifier and achieves the technical index of system design.