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浅谈升降机变频器如何选用?

文章来源:www.trsjjx.com   发布时间:2014-8-16 14:15:27   浏览次数:

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在热兑法冶炼微碳铬铁的生产工艺中,要将熔渣、硅铬与铬矿、高碳铬铁进行炉外热兑。热兑时熔渣流速的控制直接涉及到热兑反应程度。对熔渣流速的控制,由变频器控制升降机构来实现。

1、变频容量的选择方案在电机运转中,因为机械升、降时的电流较大,应求出对应于最大启动转矩和升降速转矩的电动机电流。此外,主钩与副钩电动机必须分别配用变频器,不能共用。
Inverter capacity options in the motor is running, because of mechanical ascending, descending when the current is large, should be determined corresponding to the maximum starting torque and acceleration and deceleration torque motor current. In addition, the main hook and vice hook motor must be equipped with the inverter, respectively, can not be shared.
2、控制电路
位能的最大释放功率等于升降机构在装载最大负荷的情况下以最高速度下降时释放功率,电动机的功率实际上是电动机的额定功率。耗能电阻的容量:电动机的再生制动状态下发出的电能全部消耗在耗能电阻上,因此,耗能电阻的容量Prb应与电动机的容量Pmn相等,即Prb=Pmn。
The maximum power is equal to the potential energy is released when the lifting mechanism to release the power at the highest rate of decline in the case of the maximum load of the load, the motor power is actually rated motor power. Energy-resistance capacity: motor regenerative braking power under state issued all the energy consumed in the resistance, so energy capacity Prb resistance should be equal to the motor capacity Pmn that Prb = Pmn.
3、电能反馈
电能反馈是指盲流电路中讨高的泵升电压反馈给电源电路。采用具有电源反馈功能的变频器。
Power feedback circuit means a permanent residence to discuss the high pumping voltage feedback to the power circuit. Using the inverter with a power feedback function.
4、调速机构与控制电路
虽然变频调速是无级的,完全可以通过外接电位器来进行调速,但为了迎合操作人员的传统操作方法,调速时的基本操作方法和拖动系统的操作方法相似。因此采用左右多档转速的控制方法。
Although stepless frequency control is entirely possible to speed through an external potentiometer, but in order to cater to the traditional method of operation of the operator, the basic method of operation speed when operating methods and drag system similar. Therefore, the use of multi-stall speed is about control methods.

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