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When using two phase stepper motor found stepper motor torque is small, or can not reach the rated nominal torque value, so we have to increase the size of the step motor and the nominal current, in order to meet the power demand. Sometimes it is not actually motor problem, but in the selection or stepper motor generator drives the working current of set, did not show the maximum efficiency of the stepper motor. First of all, from the drive into consideration, most current of two phase stepping motor drive is to use the output of the whole bridge connection of www.facebook.com/guohong.trading four auto spare parts lines, if two phase stepper motor is also four wire, according to the setting of the nominal current of motor drive should be correct, and the highest efficiency, to achieve maximum output torque. At present, the new production of stepper motors are small diesel engine mostly this kind of form.
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Now, the net friend mostly bought secondhand early production alternator generator of stepper motor, more is two phase six wire (four groups of two to coil in series, each with the center tap), and a small diesel generator set amount of eight wire (four groups of two independent coil). Is two phase six wire stepper motor has two kinds of connection, the first is to abandon on both ends of the center tap, the actual is to used in each group of two phase coil together, squirrel cage induction motor motor torque and high efficiency of some, but the performance is poor. The second is to center tap and end, the water pump price connection machine high speed performance is better, but idle, each phase has a set of coil wall small torque and efficiency is lower. The net friend mostly adopts the first connection method. That there is a problem, two phase current of the drive should set much right, generally squirrel cage induction motor are nominal current value to be set according to the motor, it is the efficiency of the previously mentioned motor problems.
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