译文：
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"
（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xx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{zh0}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"
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原文：
Failure phenomenon: Centrifuge is a must for hospitals and research
institutions of the One of the important equipment, it will have a
direct impact on the quality of being centrifugal
centrifugal material, "I am a speed
of instability in the maintenance of centrifuges, they found both
high-speed or low speed is not stable" Troubleshooting: The
centrifuge is a DC-type speed control motors, the speed of change
through the adjustable resistor thyristor's conduction angle of
thyristor controlled rectifier by the motor arrived at both ends of
the voltage in order to achieve control The purpose of speed "motor
speed instability, from the principles of the analysis, the
following four cases, there may be" (1) adjustable resistance, due
to adjustable resistor installed on the control panel, use the
frequency is very high, a long time, there is very poor contact of
the ordinary " (2) SCR are also many problems, usually breakdown
short circuit, open circuit and can not trigger or internal
connection is bad, etc. " (3) four rectifier diodes in a only a
problem " (4) between the rotor and the commutator itself is bad
toner or Brush and other "first in line with the principles of the easier repairs, first of all
measurements adjustable resistance, resistance with the regulation
while the changes in the law to prove that potentiometer is a good
"re-measurement of silicon have also found no problems" in the
measurement of four rectifier diodes, we found that there is a good
times and bad, because the diode is a high-current gold seal tube
"end of the screw fastening the circuit board, and the other one
with the wire soldered to the board "from the circuit board
removed, we found a loose positive and negative phenomena, and then
measure the side while shaking, confirmed that the diode good times
and bad," as the tube model can not see, put the same size pipe
installed, electricity boot speed very quickly that the tube just
breakdown, remove the measure remains intact, "Measurement of the
other three diodes are normal", but in more measured, we found two
kinds of models of positive and negative polarity opposite diode (that is, one end of the screw
has a positive polarity, and also negative in nature) "Therefore,
we must pay attention during installation is best to use the same
model with the specification of components," When put on the same
model with the specification of components, the power test machine
Everything back to normal "
原文来源：
