variator gearbox

Gear adaptive variator may be the toothed transmission with the variable transfer ratio which is definitely adapting to the adjustable 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. The decision of this problem can be based on utilization of a kinematic chain with two examples of freedom. Variator Gearbox Earlier it had been proved that kinematic chain with closed contour possesses the result of drive adaptation. The gear variator can be carried out in the type of the closed differential mechanism. The external variable technological loading changes the transfer ratio itself without any control system. The gear variator opens essentially new idea of creation of adaptive engineering for devices with variable technological level of resistance (for instance, adaptive gearbox of car). The idea of a equipment variator is based on discovery «Effect of pressure adaptation in mechanics» which is released in leading editions of globe press. In the paper the bases of the idea of a gear adaptive variator are presented.
There are different types of DC drive setups with the designation dependant on the source of their DC current. This is often the case in emergency backup systems. For instance, power plants have a bank of batteries that supply DC current to emergency essential oil pumps that supply oil to the bearings of a turbine during a crisis shutdown. A second way to obtain DC current could be from a (Motor-Generator) MG established. In this case, the electric motor drives a DC generator that generates the DC current. These first two types of drives offer pure DC current, therefore they do not produce any significant electrically induced signals in regards 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 create a DC transmission with AC pulses that match the firing of the SCRs. These pulses or lack thereof in the case of failed SCRs and or gating complications produce vibration signals which can be analyzed to look for the source of the defect. Improper tuning of variable speed drives may also generate vibration problems.

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

Complete Wave Rectification: The above plot shows a standard spectrum from a current probe on the lead to a DC drive. As can be seen, the only major component is at 360HZ. That is normal due to the non-sinusoidal character of the existing waveform.


Recent Posts