Gear adaptive variator is the toothed tranny with the variable transfer ratio which can be adapting to the variable loading. Unsuccessful tries of creation of a equipment variator were undertaken repeatedly. The main problem is-maintenance of continuous engagement of cogwheels of a variator. The decision of this problem can be based on utilization of a kinematic chain with two levels of freedom. Earlier it was proved that this kinematic chain with closed contour possesses the result of push adaptation. The apparatus variator can be performed in the type of the closed differential mechanism. The external variable technological loading changes the transfer ratio itself with no control system. The gear 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 theory of a gear variator is founded on discovery «Effect of drive adaptation in mechanics» which is published in leading editions of globe press. In the paper the bases of the idea of a equipment adaptive variator are presented.
There are different types of DC drive setups with the designation depending upon the foundation of their DC current. This is often the case in emergency backup systems. For instance, power plants have a bank of batteries supplying DC current to emergency essential oil pumps that supply essential oil to the bearings of a turbine during a crisis shutdown. A second way to obtain DC current could possibly be from a (Motor-Generator) MG arranged. In this case, the engine drives a DC generator that generates the DC current. These first two types of drives provide pure DC current, consequently they do not create any significant electrically induced indicators when it comes to vibration. The last kind of DC drive, and the one that will be discussed in this paper, uses silicon controlled rectifiers (SCRs) to rectify AC current into DC Current. These drives create a DC transmission with AC pulses that match the firing of the SCRs. These pulses or absence thereof regarding failed SCRs and or gating complications produce vibration Variator Gearbox signals which can be analyzed to determine the source of the defect. Improper tuning of adjustable speed drives can also generate vibration problems.
Rectification: The first concept that should be understood in regards to DC drives is certainly rectification. Rectification may be the process of transforming AC current into DC current. Pictured below is a fifty percent wave rectifier and the resulting output. Only the positive part of the current Al passes through the rectifier.
Full Wave Rectification: The above plot shows a normal spectrum from a current probe on the result in a DC drive. As is seen, the only main component reaches 360HZ. This is normal due to the non-sinusoidal nature of the existing waveform.