انتخاب صفحه

چرخ دنده گیربکس واریاتور adaptive variator is the toothed tranny with the variable transfer ratio which is definitely adapting to the variable loading. Unsuccessful efforts of creation of a equipment variator were undertaken repeatedly. The primary problem is-maintenance of continuous engagement of cogwheels of a variator. Your choice of this problem can be based on use of a kinematic chain with two examples of freedom. Earlier it was proved that this kinematic chain with shut contour possesses the effect of power adaptation. The gear variator can be performed in the type of the closed differential system. The external variable technological loading adjustments the transfer ratio itself without any control system. The apparatus variator opens essentially new concept of creation of adaptive engineering for machines with variable technological level of resistance (for instance, adaptive gearbox of car). The idea of a gear variator is based on discovery «Effect of force adaptation in mechanics» which is usually released in leading editions of globe press. In the paper the bases of the idea of a equipment adaptive variator are presented.
There are various kinds of DC drive setups with the designation depending upon the source of their DC current. This is often the case in emergency backup systems. For instance, power plants have a financial institution of batteries that supply DC current to emergency oil pumps that supply oil to the bearings of a turbine during an emergency shutdown. A second source of DC current could be from a (Motor-Generator) MG arranged. In this instance, the motor drives a DC generator that generates the DC current. These first two types of drives provide pure DC current, for that reason they do not produce any significant electrically induced indicators when it comes to vibration. The last type of DC drive, and the one which will be discussed in this paper, uses silicon managed rectifiers (SCRs) to rectify AC current into DC Current. These drives produce a DC transmission with AC pulses that correspond to the firing of the SCRs. These pulses or lack thereof in the case of failed SCRs and or gating problems produce vibration signals that can be analyzed to look for the source of the defect. Improper tuning of adjustable speed drives may also generate vibration problems.

Rectification: The first concept that should be understood in regards to DC drives is certainly rectification. Rectification is the process of transforming AC current into DC current. Pictured below is a fifty percent wave rectifier and the resulting result. Only the positive area of the current Al passes through the rectifier.

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