Gear adaptive variator may be the toothed transmission with the Variator Gearbox variable transfer ratio which is definitely adapting to the variable loading. Unsuccessful efforts of creation of a gear variator had been undertaken repeatedly. The primary problem is-maintenance of continuous engagement of cogwheels of a variator. Your choice of this problem can be based on utilization of a kinematic chain with two degrees of freedom. Earlier it had been proved that kinematic chain with shut contour possesses the effect of push adaptation. The apparatus variator can be carried out in the kind of the shut differential system. The external variable technological loading changes 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 resistance (for instance, adaptive gearbox of car). The theory of a equipment variator is based on discovery «Impact of power adaptation in mechanics» which can be published in leading editions of globe press. In the paper the bases of the theory of a equipment adaptive variator are presented.
There are different types of DC drive setups with the designation depending upon the source of their DC current. This is the case in emergency back-up systems. For example, power plants have a bank of batteries supplying DC current to emergency essential oil pumps that supply oil to the bearings of a turbine during an emergency shutdown. A second way to obtain DC current could possibly be from a (Motor-Generator) MG set. In this instance, the motor drives a DC generator that generates the DC current. These initial two types of drives offer pure DC current, for that reason they do not generate any significant electrically induced indicators when it comes to vibration. The last kind 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 absence thereof regarding failed SCRs and or gating problems produce vibration signals which can be analyzed to determine the source of the defect. Improper tuning of adjustable speed drives may also generate vibration problems.
Rectification: The first concept that needs to be understood in regards to DC drives can be rectification. Rectification is the process of converting AC current into DC current. Pictured below is usually a half wave rectifier and the resulting output. Only the positive section of the current Al passes through the rectifier.
Full Wave Rectification: The over plot shows a standard spectrum from a current probe upon the result in a DC drive. As is seen, the only main component reaches 360HZ. That is normal due to the non-sinusoidal character of the existing waveform.