Gear adaptive variator is the toothed transmitting with the variable transfer ratio which is adapting to the variable loading. Unsuccessful attempts of creation of a equipment variator had been undertaken repeatedly. The main problem is-maintenance of constant engagement of cogwheels of a variator. The decision of this problem could be based on utilization of a kinematic chain with two degrees of freedom. Earlier it was proved that kinematic chain with closed contour possesses the effect of push adaptation. The gear variator can be carried out in the form of the closed differential mechanism. The external variable technological loading adjustments the transfer ratio itself with no control system. The apparatus variator opens essentially new concept of creation of adaptive engineering for devices with variable technological level of resistance (for instance, adaptive gearbox of car). The theory of a gear variator is founded on discovery «Effect of power adaptation in mechanics» which is definitely published in leading editions of globe press. In the paper the bases of the idea of a gear adaptive variator are provided.
There are various kinds of DC drive setups with the designation depending upon the source of their DC current. This is the case in emergency backup systems. For instance, power vegetation have a bank of batteries that supply DC current to emergency essential oil pumps that supply oil to the bearings of a turbine during an emergency shutdown. A second source of DC current could possibly be from a (Motor-Generator) MG established. In this instance, the electric motor drives a DC generator that generates the DC current. These first two types of drives offer pure DC current, consequently they do not produce any significant electrically induced signals in regards to vibration. The last type of DC drive, and the one that will be discussed in this paper, uses silicon managed Variator Gearbox rectifiers (SCRs) to rectify AC current into DC Current. These drives create a DC signal with AC pulses that correspond to the firing of the SCRs. These pulses or lack thereof regarding failed SCRs and or gating problems produce vibration signals which can be analyzed to determine the way to obtain the defect. Improper tuning of variable speed drives can also generate vibration problems.
Rectification: The first concept that should be understood in regards to DC drives is rectification. Rectification is the process of converting AC current into DC current. Pictured below is definitely a fifty percent wave rectifier and the resulting output. Only the positive part 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. This is normal due to the non-sinusoidal character of the existing waveform.