The working principle and error analysis of DC speed generator rental @ QingdaoGenerator18810769755
First, the working principle of renting a DC tachogenerator: at no load, the output voltage of the DC tachogenerator is the armature induced electromotive force. Obviously, the output voltage is proportional to the speed. In addition, the output of the DC speed measuring generator is a pulsating voltage, and its AC weight has an important impact on the speed response control system and high-precision calculation installation.
Qingdao Generator Rental CenterWorking principle and error analysis of DC speed generator rental
(1) When the armature reacts to the DC speed generator load, the armature current will produce an armature response. The armature demagnetization reduces the air gap flux and output voltage. Judging from the output characteristics, the slope is reduced. The larger the armature current is, the more obvious the demagnetizing effect of the armature response is.
(2) Contact resistance If the total resistance of the armature circuit includes the contact resistance between the brush and the commutator, the output voltage is always affected by the voltage drop of the contact resistance, and the voltage drop changes with the change of the load current. When the input speed is low, the contact resistance is large, so that the output voltage is not large at this time and a linear error occurs. Large; when the current is large, the contact resistance is small, tends to be stable, and the linearity error is relatively small.
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