简述：故障现象:离心机是医院和科研机构必不可的 重要设备之一,它的好坏直接影响到被离心物的离心质量"本人在检修一台速度不稳的离心机时,发现无论是高速还是低速都不稳定"

故障现象:离心机是医院和科研机构必不可的
    重要设备之一,它的好坏直接影响到被离心物的离心质量"本人在检修一台速度不稳的离心机时,发现无论是高速还是低速都不稳定"
    故障检修:该离心机是一台直流式调速电机,其速度的快慢是通过可调电阻改变可控硅的导通角度,再由可控硅控制整流后到达电机两端的电压,以达到控制速度的目的"电机转速不稳,从原理上分析,以下四种情况都有可能" Fault phenomenon: centrifuge is a hospital and research institutions will not be

重要设备之一,它的好坏直接影响到被离心物的离心质量"本人在检修一台速度不稳的离心机时,发现无论是高速还是低速都不稳定"

One of the important equipment, it has a direct impact on the quality of "by centrifugal centrifugal compound I in the maintenance of a speed instability, that whether high or low is not stable"

故障检修:该离心机是一台直流式调速电机,其速度的快慢是通过可调电阻改变可控硅的导通角度,再由可控硅控制整流后到达电机两端的电压,以达到控制速度的目的"电机转速不稳,从原理上分析,以下四种情况都有可能"

Troubleshooting: the centrifuge type motor is a DC, its speed is adjustable resistance change through the thyristor conduction angle, then the controlled silicon controlled rectifier to voltage of two ends of the motor, in order to control the speed of the motor speed instability ", from the principle of the analysis, the following four kinds of circumstances there may be"

    (1)可调电阻,因可调电阻安装在控制面板上,使用频率非常高,时间长了,出现接触不良的情况很普通"
    (2)可控硅出现问题的也不少,通常是击穿短路,开路,不能触发或内部接触不良等"
    (3)四个整流二极管中的某一只有问题"
    (4)电机转子与整流子之间有碳粉或碳刷本身不良等"本着先易后难的修理原则,首先测量可调电阻,阻值随调节而有规律的变化,证明电位器是好的"再测量可控硅也未发现问题"在测量四只整流二极管时,发现有一只时好时坏,由于该二极管是大电流金封管"一端上螺丝紧固在电路板上,另一头用线焊接到电路板上"从电路板上拆下时,发现正负极有松动现象,再一边测量一边摇动,证实该二极管时好时坏"由于该管型号无法看清,就把同规格的管子装上,通电开机转速很快,认为刚的管子击穿,拆下测量完好无损"测量其他三只二极管也正常"但就在比较测量时,发现两种型号的二极管正负极性完全相反(即上螺丝的一端有正极性的,也有负极性的)"所以在安装时一定要注意最好用同型号的,同规格的元件"当换上同规格同型号的元件时,通电试机,一切恢复正常"

(1) the adjustable resistor, the adjustable resistor is arranged on the control panel, use frequency is very high, a long time, contact undesirable situation is very common"

(2)可控硅出现问题的也不少,通常是击穿短路,开路,不能触发或内部接触不良等"

(2) silicon controlled problems also many, usually short circuit, open circuit, cannot trigger or internal bad contact "

(3)四个整流二极管中的某一只有问题"

(3) four rectifier diodes in a only"

(4)电机转子与整流子之间有碳粉或碳刷本身不良等"本着先易后难的修理原则,首先测量可调电阻,阻值随调节而有规律的变化,证明电位器是好的"再测量可控硅也未发现问题"在测量四只整流二极管时,发现有一只时好时坏,由于该二极管是大电流金封管"一端上螺丝紧固在电路板上,另一头用线焊接到电路板上"从电路板上拆下时,发现正负极有松动现象,再一边测量一边摇动,证实该二极管时好时坏"由于该管型号无法看清,就把同规格的管子装上,通电开机转速很快,认为刚的管子击穿,拆下测量完好无损"测量其他三只二极管也正常"但就在比较测量时,发现两种型号的二极管正负极性完全相反(即上螺丝的一端有正极性的,也有负极性的)"所以在安装时一定要注意最好用同型号的,同规格的元件"当换上同规格同型号的元件时,通电试机,一切恢复正常"

(4) between the motor rotor and commutator or brush carbon itself "in poor repair Principle difficult first easy hind, the first measurement of adjustable resistance, resistance with regulation and regular changes, that is to measure the potentiometer SCR good" did not find the problem "in the measurement of four rectifier diodes, found there is a HERSHEY'S bad, because the diode is the current gold seal tube" end fastening screws on the circuit board, the other end with wire soldered to the circuit board "removed from the circuit board, found that the negative pole loosening, again while measuring a shaking, confirmed that the diode HERSHEY'S bad" because the pipe model cannot see, the same specifications pipe installed, electricity power speed quickly, just think the tube breakdown, remove measuring intact "measurement of the other three diodes are normal" but in the comparison measurement, found the diode plus or minus two types of opposite polarity (i.e. end screw with positive polarity, also have negative polarity) "so when installed, must pay attention to the best use of the same model with the specifications of the components," when replaced with same specification and same type components, power test machine, everything back to normal"